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, Yoga Budi Bhakti, Ria Asep Sumarni, Dwi Sulisworo, Moh Toifur
International Journal of Educational Management and Innovation, Volume 2, pp 175-182; doi:10.12928/ijemi.v2i2.3491

Abstract:
Ideal condition in physics learning should combine concepts with technology. Traditional physics learning causes students to be not interested in learning physics. There must be innovations in physics learning to be more interactive learning. One of them flipped classroom learning. Flipped classroom learning combined with Kahoot online games will make students more active. The purpose of this research is to increase students' learning motivation with Kahoot-based flipped classroom learning. The method used in this research is the quasi-experimental method with the research design of The Randomized Post-Test Only Control Group Design. The research finding can describe as follows: First, the flipped classroom is learning the model that combines face-to-face with e-learning to improve students' motivation in physics learning. Second, Kahoot in a flipped classroom supported as an evaluation model. Third, three main steps in applying the flipped classroom are preparing, implementing, and evaluating the design.
Anis Fauzi, Mochamad Mizzudin, Nana Suryapermana, Ani Lestari
International Journal of Educational Management and Innovation, Volume 2, pp 213-227; doi:10.12928/ijemi.v2i2.3687

Abstract:
Strategic management offers the school to plan a superior strategy to achieve the school's vision and mission. However, in reality, not all schools implement strategic management. So there is a gap between expectations and reality. This study aims to describe the strategic management of SD Muhammadiyah in improving service quality and graduate education. This research is a qualitative study, by taking the object of research in SD Muhammadiyah 12 Pamulang related to superior strategies undertaken by SD Muhammadiyah in improving the quality of services and education graduates. Data collection techniques carried out by observation, interviews, and documentation. Data analysis performed using descriptive methods. The results showed that the strategic management process of SD Muhammadiyah 12 Pamulang in improving service quality and education graduates began with planning through internal and external environmental analysis and the selection, implementation, and evaluation of exemplary strategy implementation
Ika Maryani, Muhamad Arif Alhakim, Rivan Gestiardi
International Journal of Educational Management and Innovation, Volume 2, pp 199-212; doi:10.12928/ijemi.v2i2.3432

Abstract:
Metacognitive skill is essential to have by every individual, including the prospective teachers' students. Some teachers who have not trained in metacognitive ability would be caused by the lack of understanding of the stages in carrying out metacognitive ability. It has not realised that metacognitive ability can affect students' learning process and learning outcome. The students who have the excellent metacognitive ability can develop metacognitive domain-oriented learning. This study aims to know the metacognitive skills of prospective primary school teachers in Universitas Ahmad Dahlan. This research used a quantitative approach to descriptive type and survey method. The samples are 100 students of elementary school educations of Universitas Ahmad Dahlan consisted of the semester II, IV, and VI. The instrument used Metacognitive Ability Inventory (MAI) with the Likert scale(1-5). Data were analysed using descriptive statistics to determine the Mean, standard deviation, percentage, and metacognitive categorisation of elementary school education students. The research result showed a low-medium range category. It influenced by some factors related to the inadequate metacognitive development of prospective primary school teachers. Judging from the cognitive knowledge aspect, the high category of the percentage calculation of cognitive knowledge aspects is in the declarative knowledge aspect. In the cognitive regulation aspect, planning becomes the highest percentage of cognitive regulation aspect.
Rahmah Dara Lufira, Lilik Zuhriyah, Satwika Desantina Muktiningsih, Aldila Putri Rahayu, Ken Diah Mangar Nastiti
International Journal of Educational Management and Innovation, Volume 2, pp 164-174; doi:10.12928/ijemi.v2i2.3490

Abstract:
Arjosari Village, Kalipare Subdistrict, Malang Regency, experiences drought every year; this makes the villagers buy water when the dry season comes. This research aims to find out how much knowledge of the people of Arjosari Village, Kalipare District, Malang Regency in saving rainwater used as an alternative to fulfil water needs in the dry season. The research method used was a descriptive survey method with a sample of 82 people. Survey studies are "a observe that takes samples from a single population and uses questionnaires as a primary records series tool". The results showed that the community's knowledge of the concept of saving rainwater was "high".Meanwhile, for the public's knowledge of methods of saving rainwater, there were 26 people in the "Low" category, 40 people in the "Medium" category, and 16 in the "High" category. Methods that can save rainwater are the construction of rainwater infiltration wells, bio pure infiltration holes, rainwater harvesting, and appropriate vegetation selection. This education can give the benefits that increase the public knowledge and awareness to conduct groundwater conservation to anticipate the lack of clean water in this area.
Joko Wahono, Intan Kusumawati, Ahmad Nasir Ari Bowo
International Journal of Educational Management and Innovation, Volume 2, pp 228-240; doi:10.12928/ijemi.v2i2.3239

Abstract:
Education aims to educate and create the nation's future generation with character. However, problems like brawls, violence, abuse of narcotics, illegal drugs, and promiscuity still occur among students. It becomes the concern of parents and teachers in educating and leading students to develop their character. The teacher is obligated to develop Pancasila and Citizenship Education learning model suitable for students to have good character. Through character education, it hoped that it would produce a sound generation. The educational process that gives birth to the expected character is, of course, gradual. This study aimed to find out Pancasila and Citizenship Education learning model for developing students' character. Research using mixed methods research with data collection, analysis, and mixing both quantitative data and qualitative. This study used quantitative and qualitative approaches in collecting data through interviews and questionnaires. The results showed that Pancasila and Citizenship Education Learning model based on character education through a comprehensive approach could develop and shape the students' character, such as inculcation, modelling, values facilitation, and skill-building. Through character development, it hoped that good characters expected to form permanently.
Romeo Jr Beriso Sotto
International Journal of Educational Management and Innovation, Volume 2, pp 136-152; doi:10.12928/ijemi.v2i2.3325

Abstract:
Collaborative Learning (CL) is an approach to teaching and learning that involves a group of learners working together. The study aims to assess collaborative learning effects in the 21st-century teaching-learning landscape, particularly on the students' cognitive, affective and psychomotor dimensions. This study utilized the descriptive-evaluative method of research with a validated questionnaire as the primary data gathering instrument. Results showed that females dominate male students as to their number in first and second-year levels. The majority of the respondents aged 20 and below have participated in various collaborative activities and assignments in and out of the class with a typical size of 5 to 7 group members. Collaborative learning found to have a very high effect on Students' Academic Learning (cognitive), Collaborative Skills (affective) and least on Skills development (psychomotor). The researchers recommend that male students be engaged in group dynamics and learning activities; it must involve teenagers and suffice their activities' preference. Activities that demand greater participation, drills and exercises, and thinking activities must allow the students to develop their cognitive, affective, and psychomotor dimensions for holistic learning.
Zakaria Zakaria
International Journal of Educational Management and Innovation, Volume 2, pp 240-248; doi:10.12928/ijemi.v2i2.3749

Abstract:
During the Covid19 epidemic that swept the world, online learning has become an essential requirement in the learning process. This research aims to describe the students of the Educational Administration Masters Study Program to online learning during the Covid-19 pandemic. This research is quantitative descriptive—the research population of the 1st and 2nd-semester students. Data collection techniques used a questionnaire—data analysis with percentage formula. The results showed that student responses to material in good categories, student responses to opportunities for discussion in good categories, student responses to the level of understanding of the material in the categories, student responses to completing assignments insufficient categories.
Aan Juhana Senjaya, Maman Rakhmanudin, Ipong Dekawati
International Journal of Educational Management and Innovation, Volume 2, pp 183-198; doi:10.12928/ijemi.v2i2.3426

Abstract:
Research on physics learning management has not been done much, especially regarding PCK and learning outcomes. Many studies that investigate the relationship between variables use the regression method. However, this study using path analysis. The purpose of this study was to measure the direct effect, indirect effect, and total effect of PCK, learning motivation, and student physics learning outcomes using path analysis. The research method used in this research is a survey with a quantitative approach and data analysis techniques, namely path analysis. The data collection technique used a closed questionnaire. This study's sample was 43 teachers who gathered from 64 high school physics teachers in Indramayu Regency. The PCK learning management research results had no significant effect on student learning outcomes. Learning motivation had a positive effect, and learning motivation had a positive effect on student learning outcomes. The implication of this study that the principal and the education office should continue to strive to improve the quality and smoothness of the teaching and learning process by providing provision to teachers to improve pedagogical content knowledge (PCK) learning management by participating in workshops and continuously improving techniques to motivate students for results student learning better.
Annafi Annanda Oktaria, Laksmita Rahmayadevi
International Journal of Educational Management and Innovation, Volume 2, pp 153-163; doi:10.12928/ijemi.v2i2.3439

Abstract:
Technology has impacted most of the sectors, including the education field. Nowadays, many schools have incorporated technology through Information and Communication Technologies (ICT) into learning. This research investigates students' perception of Google Classroom as a learning tool during the covid-19 pandemic. The method used in this research is quantitative descriptive through an online questionnaire and online deep interview sessions with students from SMP Muhammadiyah Yogyakarta. Twenty-eight students have been joining Google Classroom in English learning for at least one term during the covid-19 pandemic. Five students also interviewed to seek more information about their experiences using Google Classroom. Findings showed that several factors influence the students' online learning process in a covid-19 pandemic, namely, usefulness, ease of use, ease of learning, and satisfaction. In general, Google Classroom is very useful in improving students' skills, abilities, discipline, and independent learning through teaching materials.
Ina Insani, Tri Rina Budiwati
NOTION: Journal of Linguistics, Literature, and Culture, Volume 3, pp 53-64; doi:10.12928/notion.v3i1.3789

Abstract:
This research aims to identify and describe the discourse structures and analyze the representation of Satanism found in the lyrics of the selected songs of Alan Walker. The researcher used the Critical Discourse Analysis approach by Teun van Dijk to determine Satanism in these songs. Three elements are used in this analysis, namely the discourse structure, social cognition, and social context. This research found that there are elements of discourse structure, whether explaining the micro-structure, superstructure, or macro-structure, always address Satanism’s idea. The social cognition aspect found that the social condition influences Satanism's notion in the Alan Walker songs in Norway, where Alan Walker lives open to Satanism. It can be seen from the analysis of model and memory. The analysis of model in Alan Walker's song can be influenced by the social conditions around him. The analysis of memory shows how his personal experience affects the songs he produces. The last aspect in this research is the social context which analyse the power and access to know the idea of Satanism in the songs. The analysis of power found that Satanism has a strong dominance in Norway, as seen from several works such as books, films, and music with the theme of Satanism. Then, the analysis of access found that the satanic people managed to control several media in Norway.
Kustinah Kustinah, Sri Haryanti, Suhud Eko Yuwono, Umi Sholihah
NOTION: Journal of Linguistics, Literature, and Culture, Volume 3, pp 18-29; doi:10.12928/notion.v3i1.3547

Abstract:
It is said that Afro-American literature is the body of literature produced in the United states by writers of African descent. Today, Afro-American literature has become accepted as an integral part of American literature. In broad terms, Afro-American literature can be defined as writings by people of African descent living in the United States. This qualitative study analyzes a short story entitled Gorilla, My Lovewritten by a female Afro-American writer, Toni Cade Bambara. The analysis of the study aims at answering the three problem formulation: (1) states the literariness of the text (2) explains how the literariness of the text play as a means to symbolize a “broader” text (the universe) and (3) writes the proof of mental evidences taken from the text. In analyzing the short story, this study uses Sociology of Literature and Psychology of Literature. The two theories help readers understanding the theme of the short story by reading the explanation about how the narrator of the story set the plot. This study uses narrative as its approach since this is a literary study where a short story is analyzed through its narrative structure. The conclusion of the study provides the proof of its research benefits: giving information to readers about the following: (1) all about Afro-American literature plus its life-experience, family-values, etc. (2) how a literary work can connect its readers to their life and (3) an understanding that a reading-act strengthens the definition that a literary work is as a portrait of human experience.
Estrella T. Arroyo
NOTION: Journal of Linguistics, Literature, and Culture, Volume 3, pp 1-10; doi:10.12928/notion.v3i1.3870

Abstract:
This study explored the concept of “HEROINE” in the context of “Darna,” a Filipino graphic narrative written by Mars Ravelo that was first published on May 13, 1950 by Filipino Komiks. Extracted from the 27 episodes of “Darna” are realities of experience as well as innuendos related to the real character of Darna, the super heroine. Further, the study delved into a deeper meaning of heroine beyond its lexical meaning. As a result, the researcher formulated her own definition of “HEROINE” as “Humaneness and Equanimity in Reimagining Optimistic, Iconic, Novel, and Empowered” persona, which led to the findings that, indeed, Darna has reached her apotheosis as a superheroine. These insights were not fathomed had it not been for the researcher’s focus on close reading, application of Expressive Realism, and “Argustic” reading. Keen eyes are needed to enjoy reading a graphic narrative which is both visual and verbal. The study proved that in Philippine society, Darna is the most accepted, loved and idolized Filipino icon as savior of a devastated and crippled society after World War II. Lastly, it is aimed that this humble analysis will put itself into the realm of a body of Pop Literature and the Humanities.
Nurrahmawati Nurrahmawati, Ida Puspita
NOTION: Journal of Linguistics, Literature, and Culture, Volume 3, pp 11-17; doi:10.12928/notion.v3i1.3787

Abstract:
This study is aimed to analyze the comparison between women’s representation and resistance in Josephine Chia’s novel Frog under a Coconut Shell from Singapore and The God of Small Things by Arundhati Roy from India. By using a comparative literature approach, the research focuses on the differences and similarities in women’s representation and resistance to get gender equality in Singaporean and Indian society. Chia’s novel tells the story of Soon Neo and her daughter, Josephine, who struggles to get their rights as women in the midst of patriarchal Peranakan culture in Singapore, and Roy’s novel tells the story of Ammu and her twins children, Rahel and Estha, who fight against the social rules in India that are discriminative against women and the Untouchable people (Paravan). The research employed a descriptive qualitative analysis method and the theory of liberal feminism. There are similarities in the representation of women who are considered as second class and become the objects both sexually and economically; and restrained by their patriarchal society and culture. The difference of both novels is in the caste system which regulates women's freedom only reflected in The God of Small Things. From the perspective of liberal feminism, the female characters in both novels show resistance in making decision, education, society, and economy. However, resisting inequality in economy is only reflected in Frog under a Coconut Shell while resisting inequality in society is only reflected in The God of Small Things. The direct resistance is demonstrated in verbal and non-verbal ways.
Haris Prasetya Effendie
NOTION: Journal of Linguistics, Literature, and Culture, Volume 3, pp 30-43; doi:10.12928/notion.v3i1.3689

Abstract:
War and Independence were made by all types of imperialism movement plot. A widely place which contained natural resources, and people as the tribe was victimised to create the movement. Postcolonialism tells the wealth as freed to the motherland. The motherland or kingdom of great nationalism was called and a major attend to the nationalism day to pay the national bitter history with prayer. Kingdom of human life is wealth because the years moment has been calling human to study about political relation, nationalism relation, nationalism knowledge. Case of war and how the wealth is always in upper domination are how the poetry as a literary work to reflect the soul of cultural hope and denotation in the poetry line. Wealthy is a most appropriate statue to know the social life. The nationalism knowledge is freed because the structure of greatness what human must to study is education to speak about wealth after wealthy. Descent aspect was ordered to the identity of nation, but no less to join the political descent to restart the freedom to some nation. The wisdom from any discipline to grow and refresh the freedom identity about nature and humanity. India has the nasionalism history as Indonesia when Rabindranath Tagore also talks about how the country speak about all the day long nationally wealth in his poetry to next their life. The research was a qualitative research to apply the Postcolonialism theory.
Hakeemi Harris Ayedoji
NOTION: Journal of Linguistics, Literature, and Culture, Volume 3, pp 44-52; doi:10.12928/notion.v3i1.3926

Abstract:
Semiotic comes from Greek word which is semeion (sign). Yet, generally, semiotics is a study which concern about the existence of sign in society. We could find sign everywhere, from the form of words, images, objects, etc. Thus, the object of semiotics could be anything. But, Charles Sanders Pierce explain sign in a different way. According to Pierce’s study, something could be categorized into sign if it could be taken part in the triadic relation. Semiotic study is used in analizing the research. The main data of this research is the #starterpack tweets in Twitter. The data used is focused in the #starterpack tweets with white and black people context from 2019-2020. While the supporting data for this research are from the journals, books, internet sources, and dictionaries. To collect the data, the research used the observation method and use note technique. While, the research used the triadic signs in by Charles Sanders Pierce to analyze the data. From the analizing, the researcher got 40 #starterpack tweets with mostly 4 images in it. Those tweets could be divided to 20 white people #starterpack and 20 black people #starterpack tweets. All the data are analyzed with the triadic signs which are signs, objects, and interpretations. The signs that had been analyzed show objects and interpretations which lead to the gap between white and black people. Those gaps then lead to stereotypes on white and black people. Moreover, the data lead to 6 factors of stereotypes. Those factors are nationatility, personal integrity, curiosity, adaptation, homogeneus neighborhood, and common shared information.
Ety Dwiastuti, Moh. Toifur
Berkala Fisika Indonesia : Jurnal Ilmiah Fisika, Pembelajaran dan Aplikasinya, Volume 12, pp 33-39; doi:10.12928/bfi-jifpa.v12i2.20336

Abstract:
Perancangan geometri jalan terutama dimaksudkan untuk menjaga keselamatan dan kenyamanan pengguna jalan. Interchange (simpang susun) jalan tol biasanya berupa tikungan dengan kemiringan tertentu yang dirancang agar pengemudi merasa nyaman dan aman saat kendaraan yang dikemudikannya bergerak melintas dengan kecepatan rata-rata aman. Penelitian ini mensimulasikan parameter-parameter koefisien gesek melintang antara permukaan jalan dengan ban (µs), kemiringan melintang (tanq), kecepatan rencana (v), jari-jari tikungan (R) dan derajat kelengkungan tikungan (δ) menggunakan software Excel. Pada koefisien gesekan melintang (µs) tetap, kendaraan yang bergerak makin cepat di sebuah tikungan memerlukan jari-jari tikungan (R) yang besar. Agar kendaraan tidak slip keluar dari jalur maka jalan dibuat semakin miring. Kemiringan jalan menahan kekuatan gaya sentrifugal yang menyebabkan kendaraan slip.
Aurelia Astria L. Jewaru, Purbo Suwasono, Asim Asim
Berkala Fisika Indonesia : Jurnal Ilmiah Fisika, Pembelajaran dan Aplikasinya, Volume 12, pp 40-48; doi:10.12928/bfi-jifpa.v12i2.20338

Abstract:
Penelitian ini bertujuan untuk membandingkan kemampuan pemecahan masalah siswa yang menggunakan model PBL-GI terhadap siswa yang menggunakan model PBL. Penelitian ini adalah penelitian kuantitatif dengan jenis quasi-experiment, Pretest-Posttest Control Group Design. Sampel penelitian berasal dari siswa kelas XI IPA SMAN 2 Malang tahun pelajaran 2018/2019 yang dipilih menggunakan teknik purposive sampling. Diperoleh kelas XI IPA 4 sebagai kelas eksperimen (KE) dan XI IPA 3 sebagai kelas kontrol (KK). Hasil penelitian menunjukkan bahwa kemampuan pemecahan masalah siswa pada kelas PBL-GI (KE) lebih tinggi dari siswa kelas PBL (KK). Hal ini dibuktikan dengan uji-t, diperoleh thitung = 3,021 dengan Sig. = 0,002.
Ainun Fuadah, Susilawati Susilawati, Agatha Hadi Nugraha, Dwi Sulisworo
Berkala Fisika Indonesia : Jurnal Ilmiah Fisika, Pembelajaran dan Aplikasinya, Volume 12, pp 49-53; doi:10.12928/bfi-jifpa.v12i2.20340

Abstract:
Penelitian ini bertujuan untuk mengetahui tingkat respon peserta didik pada program Edmodo dalam model pembelajaran Blended Learning yang telah diimplementasikan selama 3 bulan. Subyek coba adalah peserta didii kelas X SMKN 3 Banjar dengan jumlah sampel 35 orang. Penelitian ini merupakan penelitian kualitatif dengan menggunakan instrumen penelitian berupa angket. Analisis data dilakukan secara deskriptif dengan penskoran. Hasil analisis menunjukkan bahwa 46% partisipan merasa puas dan 54% partisipan merasa sangat puas terhadap program Edmodo. Partisipan juga menilai bahwa program Edmodo membantu mereka dalam belajar serta mudah digunakan dan dipelajari.
Muhammad Anas, Hunaidah Made Ali, Muhammad Sofyan, Idris Idris, Sulwan Sulwan, Suritno Fayanto
Berkala Fisika Indonesia : Jurnal Ilmiah Fisika, Pembelajaran dan Aplikasinya, Volume 12, pp 60-70; doi:10.12928/bfi-jifpa.v12i2.20342

Abstract:
Penelitian ini bertujuan untuk mengetahui pengaruh variasi temperatur aktivasi (600oC, 700oC, 800oC, dan 900oC) terhadap daya serap logam timbal (Pb) dan seng (Zn) menggunakan arang aktif kayu mahoni. Arang aktif dihasilkan melalui proses preparasi, karbonasi dan aktivasi untuk menghasilkan butiran adsorben 100 mesh. Massa adsorben masing-masing 10 gr dan waktu kontak 100 menit. Adsorben dimasukkan ke dalam labu elemenyer yang terisi air logam kemudian dihomogenkan dan dilihat penurunan konsentrasi air logam tersebut. Konsentrasi air logam diukur menggunakan Atomic Absorption Spectrophotometer. Hasil penelitian menunjukkan kondisi optimum penyerapan logam Pb dan Zn pada temperatur 800oC dan 700oC. Efisiensi penyerapan logam Pb 82,84%, dan logam Zn 55,8%. Dapat disimpulkan bahwa semakin besar temperatur aktivasi dari suatu arang aktif, semakin tinggi daya serap dan efisiensi penyerapan logam Pb dan Zn.
Agustinus Suwondo, Moh. Irma Sukarelawan, Sriyanto Sriyanto
Berkala Fisika Indonesia : Jurnal Ilmiah Fisika, Pembelajaran dan Aplikasinya, Volume 12, pp 54-59; doi:10.12928/bfi-jifpa.v12i2.20265

Abstract:
Tujuan penelitian ini adalah untuk meningkatkan keaktifan belajar fisika siswa pada materi rangkaian listrik tertutup sederhana menggunakan media power point. Penelitian ini menggunakan model Penelitian tindakan kelas (PTK) sebanyak dua siklus. Kegiatan penelitian dilaksanakan pada kelas X.2 di SMAN 1 Srandakan Bantul. Pengumpulan data menggunakan angket keaktifan yang terdiri atas 9 aspek. Siklus penelitian dianggap cukup jika persentase keaktifan siswa tiap aspek dan keaktifan rata-rata kelas lebih dari 77%. Hasil penelitian menunjukkan rata-rata keaktifan siswa meningkat sebesar 30,69%. Persentase keaktifan pada siklus 1 sebesar 66,14% dan pada siklus 2 sebesar 96,83%. Jadi dapat disimpulkan bahwa penggunaan media powerpoint dapat meningkatkan keaktifan belajar siswa pada materi rangkaian listrik tertutup sederhana.
Suripto Suripto, Istanti Istanti
Optimum: Jurnal Ekonomi dan Pembangunan, Volume 11, pp 107-122; doi:10.12928/optimum.v11i1.3905

Abstract:
Food security is closely related to community welfare and poverty. The ultimate goal of food security is to improve human welfare which can be seen from the fulfillment of one's right to food. The type of data used in this study is the data from March 2019 Susenas DI Yogyakarta. The research includes measuring the degree of food security using indicators of household income and nutritional consumption. This study uses a factor analysis of the CFA (Confirmatory Factor Analysis) method. Resilience at the national level is based on resilience at the household level. For this reason, a study on household variables is the focus of the government in realizing food security. This study identifies 13 variables of household characteristics, identification using Confirmatory Factor Analysis (CFA) to classify the variables into factors/dimensions of food security. Based on the results of research, 13 household characteristics variables are divided into 4 factors, namely the Dimension of Food Availability including the level of consumption of calories/capita/day, household BPNT acceptance in quintile 2, rice prices, and expenditure groups per capita with a loading factor of 0.80 are the dominant variables. The Food Stability dimension includes the sex of the head of the household, the number of household members, and the variable of the marital status of the head of the household is the dominant variable with a factor loading of 0.96. The dimensions of access to food to get food consist of the status of the area of residence, the status of the head of the household in the formal sector, the age of the head of the household, and the dominant variable of the education of the head of the household with a loading factor of 0.64. The dimensions of food use include the number of household members experiencing health complaints as the dominant variable with a loading factor value of 0.89 and the number of household members who have been outpatient in the last month.
Dini Yuniarti, Arif Sapto Yuniarto
Optimum: Jurnal Ekonomi dan Pembangunan, Volume 11, pp 12-23; doi:10.12928/optimum.v11i1.3570

Abstract:
Credit has a role in agricultural development and the income of small farmers which will reduce poverty levels. However, the portion of credit in the agricultural sector is still relatively small. This study aims to examine determinants of credit in the agricultural sub-sector. The factors include credit rating, credit interest rates, Gross Domestic Product and the number of farmers in the agricultural sub-sector. The data used are secondary data, a combination of cross-sectional data including the agricultural sub-sector, namely food crops, horticultural crops, plantations and livestock and seres times including 2011-2019. The analysis tool used is the regression data panel. The study results show that the number of creditors in the agricultural sector is positive and significant by the number of farmers and Gross Domestic Product, while interest does not affect the credit rating of the agricultural sub-sector. Policies that can be taken are to increase the Gross Domestic Product of the agricultural sector to increase the capacity of farmers. In addition, to increase farmers' access to financial institutions, financial education is needed, so that it will increase financial literacy.
Farma Andiansyah
Optimum: Jurnal Ekonomi dan Pembangunan, Volume 11, pp 71-91; doi:10.12928/optimum.v11i1.4017

Abstract:
Foreign capital flows are important factors in the development of sustainable economies, especially in developing countries such as the OIC countries. Lately, the rapid development of the financial sector and macroeconomic stability became a serious concern by foreign investors, where financial inclusion and macroeconomics played an important role in attracting direct foreign capital flows (FDI). The study aims to investigate the role of financial inclusion and macroeconomic variables on the foreign direct flow of capital (FDI) by using data panels in 8 OKI member States during the 2012-2018 time span. The research uses the Fix Effect Model (FEM) Panel data Analysis tool, which is believed to be able to explain the correlation between independent variables and more accurate dependents. As for the results of the study showed that in partial only variable avaibility (the number of branches of the bank/100,000 adults) is a significant positive draws FDI in the OKI country. While on macroeconomic variables the exchange rates have significant negative effect on FDI, while interest rates and economic growth have significant positive relationships in attracting FDI.
Wiwik Prihatin, Evi Gravitiani
Optimum: Jurnal Ekonomi dan Pembangunan, Volume 11, pp 59-70; doi:10.12928/optimum.v11i1.3267

Abstract:
This study will discuss the inequality of infrastructure development in terms of various aspects such as road conditions, clean water, solid waste, education, worship, and health. The purpose of this research is to determine the condition of infrastructure development that is not evenly distributed in the Banjarnegara district so that a strategy can be formulated to overcome this problem. The method used is descriptive qualitative using primary data obtained directly through a survey to show how the state of the existing infrastructure and secondary data. The results of this study indicate that inequality in infrastructure development occurs in almost all aspects. Three important and main aspects that must be addressed immediately are related to the construction or repair of road infrastructure because it is the mobility for all community movements to carry out their activities to make it smooth and easy, so that the development of an area is also easy to do. The second is increasing the number of clean water connection service coverage, and the third is handling solid waste management. If this is not done immediately, it will lead to even wider inequality in infrastructure development in the Banjarnegara district considering that infrastructure is also the key to driving economic growth and improving the quality of people's welfare.
Lestari Sukarniati, Firsty Ramadhona Amalia Lubis
Optimum: Jurnal Ekonomi dan Pembangunan, Volume 11, pp 92-106; doi:10.12928/optimum.v11i1.3608

Abstract:
Aceh's special autonomy status allows the province to be able to obtain a larger percentage of financial resources to finance its development. The purpose of this study was to determine the influence of government spending, GRDP, and population in increasing Aceh's local revenue. This study uses a quantitative approach, the analysis tool used is panel data regression which is processed using Stata. The results of the study prove that government expenditure, GRDP, total population have a positive and significant effect on the local revenue of Aceh Province for the period 2011-2018.
Audra Rizki Himawan, Yanuar Pribadi
Optimum: Jurnal Ekonomi dan Pembangunan, Volume 11, pp 24-43; doi:10.12928/optimum.v11i1.3277

Abstract:
Fiscal risk management is part of the management of financial risk in the State Budget. Basically, these risks are interrelated although they are different things. State financial risk as an inherent risk of State Budget has a different process from fiscal risk management. This study aims to evaluate the management process and disclosure of fiscal risk in the State Budget using a case study-qualitative approach. The integration of the risk management system between the risk management unit and the fiscal risk management unit, and development of fiscal risk management framework could improve the process of managing and disclosing fiscal risk in the Budget Statement.
Aulia Hapsari Juwita, Suryanto Suryanto, Bhimo Rizky Samudro
Optimum: Jurnal Ekonomi dan Pembangunan, Volume 11, pp 1-11; doi:10.12928/optimum.v11i1.3393

Abstract:
The purpose of this paper is the international tourism have impact on economic growth and carbon dioxide (CO2) emissionsin ASEAN Five (Indonesia, Malaysia, Philippines, Thailand, Singapore) or not. There are increase in tourism receipts, GDP, and FDI as well as CO2 emissions approximately 9%, 5%, 4% and 26% respectively. They are always increasing, but is there any relation between international tourism, GDP and carbon dioxide (CO2). This research employs data from 1995 to 2018 to examine long-run equilibrium relationships between tourism, CO2, economic growth and foreign direct investment (FDI). Panel analysis with unit root and cointegration test approachis utilized. This paper found that there is a long-term equilibrium relationships between each variable.The tourism receipt, FDI and CO2 emissions affect economic growth positively and statistically significant. In addition, economic growth affect CO2 emissions while tourism does not affect CO2 and FDI indicates a negative relationship on CO2 emissions. Finally, the paper reveals that international tourism receipt affect economic growth but does not affect CO2.
Anisa Nurpita, Rina Oktavia
Optimum: Jurnal Ekonomi dan Pembangunan, Volume 11, pp 123-135; doi:10.12928/optimum.v11i1.3569

Abstract:
The property sector in Indonesia has an essential role in driving the national economy. The bank lending development to the property sector in April 2019 did not show significant growth and stagnant. This study analyzes the growth trend of property loans in Indonesia and estimates the factors that affect the number of housing loans (KPR) and apartment ownership loans (KPA) in Indonesia. The data used in this study are secondary data and time series. The analytical tools used in this research are trend and regression. The results showed that from 2020 to 2025, the property loan growth in Indonesia will still be sluggish. The condition is identified by construction loan which is expected to grow even though the increase is not too significant, real estate loan is still fluctuating, this is because in 2019 there was a decline in real estate loan growth of almost 50 percent from the previous year, and KPA and KPR are estimated to decline even though in nominal terms the number of KPR and KPA increases. The population number variable has a positive and significant effect on the number of KPR and KPA in Indonesia. The more the population, the more the number of KPR and KPA will increase. Meanwhile, the variables of economic growth and inflation in this study did not significantly affect the number of KPR and KPA.
Ranynda Niarachma, Nury Effendi, Eva Ervani
Optimum: Jurnal Ekonomi dan Pembangunan, Volume 11, pp 44-58; doi:10.12928/optimum.v11i1.3620

Abstract:
This study examines the effect of governance on FDI inflows in ASEAN countries for the period 2002-2018 using the Worldwide Governance Indicator (WGI) index. This study uses a principal component analysis (PCA) method to reduce six WGI indexes and performs panel data regression analysis using fixed-effect GLS (cross-section weights). This study uses data from World Bank for FDI, WGI, and several control variables. The results of this study have provided empirical evidence that good governance is a very important key factor in encouraging FDI inflows to host countries. This study finds three governance elements that have a positive relationship with FDI inflows in ASEAN countries are the quality of regulations, rule of law, and control of corruption.
Zulanda Pratiwi, Adhi Prakosa
Jurnal Fokus Manajemen Bisnis, Volume 11, pp 74-94; doi:10.12928/fokus.v11i1.3851

Abstract:
This study aims to determine the effect of social media, tourism events, and service facilities on revisiting interest in Gumuk Pasir Parangkusumo Sandboarding. The research was conducted on visitors to the Parangkusumo Gumuk Pasir Sandboarding. This research is a quantitative research. The sample used in this study amounted to 100 respondents. This study used purposive sampling technique and data analysis with multiple linear regression. Hypothesis testing using the T test and F test with the help of the application program SPSS version 16.0. The results of the multiple linear regression indicate that social media has a positive and significant effect on revisiting interest. Tourism events have a positive and significant effect on revisiting interest. Service facilities have a positive and significant effect on revisiting interest. Based on the results of the F test, it shows that social media, tourism events, and service facilities simultaneously have a significant effect on revisiting interest.
Rachmaniar Myrianda Dwiputri, Najmudin Najmudin
Jurnal Fokus Manajemen Bisnis, Volume 11, pp 64-73; doi:10.12928/fokus.v11i1.3757

Abstract:
The purpose of this paper is to determine the firm’s characteristics and capital structure of SMEs registered in Indonesia. This study use panel data analysis for twenty-five firms over three years (2016-2018). The samples of this study were 25 Indonesian SMEs registered in the Pefindo25 index. The capital structure determinants are expressed as a function of size, tangible assets, current ratio, return on asset, and growth. This study used a pooled fixed effect to estimate the relationship between the variables. The result shows that the capital structure of registered SMEs in Indonesia is negatively affected by size, current ratio, return on asset, and growth. Registered SMEs in Indonesia have a capital structure that is in line with POT predictions.
Alhensa Ferninda Jelita, Hasnah Rimiyati
Jurnal Fokus Manajemen Bisnis, Volume 11, pp 22-41; doi:10.12928/fokus.v11i1.3734

Abstract:
This study aims to analyze the influence of influencers' credibility on the effectiveness of Instagram social media advertising in shaping consumer buying interest (Study on Instagram followers Ayudia Bing Slamet). The subjects in this study were students using social media Instagram who were in the Special Region of Yogyakarta. This research was conducted with a sample size of 200 respondents who were determined by sampling technique using non probability sampling technique with purposive sampling method and distributing questionnaires to respondents using Google Forms. The analytical tool used is Structural Equation Modeling (SEM) with the AMOS 24 application program. Based on the analysis, it was found that the attractiveness of influencers had a positive effect on consumer attitudes towards advertising, trustworthiness towards influencers had a positive effect on consumer attitudes towards advertising, influencer expertise had a positive effect on consumer attitudes towards advertising, and attitudes towards advertising had a positive effect on buying interest.
Fitroh Adhilla, Aftoni Sutanto, Agus Siswanto
Jurnal Fokus Manajemen Bisnis, Volume 11, pp 140-153; doi:10.12928/fokus.v11i1.3747

Abstract:
Banjarnegara as one of the batik producing centers in the Indonesia, namely in the Susukan District, which borders the Banyumas area. However, Batik Gumelem is not as famous as Batik Pekalongan, Batik Solo, or Batik Banyumas. The aim of this research is to analyze the effect of social identity to positif words of mouth that mediated of consumer brand identification. This research uses a quantitative approach with a survey method. Primary data were obtained through distributing questionnaires to 185 respondents who knew about Batik Gumelem Banjarnegara. Validity testing uses confirmatory factor analysis and all items have factor loading above 0,6. Reliability testing uses cronbach’s alpha and all variables have cronbach’s alpha above 0,6. The data analysis method uses regression with mediating variable. The results showed that social identity has a positive effect on positive word of mouth, social identity has a positive effect on consumer brand identification, and consumer brand identification has a positive effect on positive word of mouth. Consumer brand identification as role as mediating variable. This shows that Batik Gumelem is perceived to have the power to be able to create an identity for consumers and lead to behavior to disseminate information about Batik Gumelem to others.
Afifatul Maimunah, Handrio Adhi Pradana
Jurnal Fokus Manajemen Bisnis, Volume 11, pp 127-139; doi:10.12928/fokus.v11i1.3892

Abstract:
Performance appraisal is acknowledged as one of the most important human resource practices. A performance appraisal system is a critically needed tool for effective human resource management if it is done systematically and effectively. This research examined whether performance appraisal influences employee motivation and employee productivity in Tribunnews.com-Solo. This research was conducted in Solo and the samples of this research were 50 employees of Tribunnews.com-Solo. This research was conducted in the quantitative method by using questionnaires for collecting the data. The data were analyzed with a linear regression test and normality test by using SPSS 25. The results of this research shows that performance appraisal has positive influences on the employee’s motivation and productivity.
Maulidia Royhana, Titi Dewi Warninda
Jurnal Fokus Manajemen Bisnis, Volume 11, pp 95-110; doi:10.12928/fokus.v11i1.3735

Abstract:
This research aims to analyze the influence of United State Economic Policy Uncertainty, Tiongkok Economic Policy Uncertainty, and Japan Economic Policy Uncertainty on the Jakarta Islamic Index. This study used time-series data from January 2001 to December 2019 and Error Correction Model (ECM) to analyze the short-term and long-term effects of United State, Tiongkok and Japan Economic Policy Uncertainty on the Jakarta Islamic Index. The results of this research show that United State EPU and Tiongkok EPU have no short-term and long-term effect on Jakarta Islamic Index. Meanwhile, in the short-term, Japan EPU has a significant influence on the Jakarta Islamic Index but has no long-term influence.
Andira Ramadha Arundita, Didik Subiyanto, Ignatius Soni Kurniawan
Jurnal Fokus Manajemen Bisnis, Volume 11, pp 1-21; doi:10.12928/fokus.v11i1.3194

Abstract:
The purpose of this study was conducted to determine the effect of the relationship between organizational culture and organizational citizenship behavior (OCB) with organizational commitment as a mediating variable. This research was conducted in the Regional Financial Institutions and Assets of Sleman Regency. The sample in this study were all employees of the Regional Financial Institutions and Assets of Sleman Regency. Data collection by distributing questionnaires using a Likert scale to measure indicators. The technique used in this research is descriptive analysis. The results of this study indicate that organizational culture has a positive and significant effect on organizational commitment, organizational culture has a positive and significant effect on organizational citizenship behavior (OCB), organizational commitment has a positive and significant effect on organizational citizenship behavior (OCB) and organizational commitment acts as mediation affect organizational culture and organizational citizenship behavior (OCB).
Suryana Hendrawan
Jurnal Fokus Manajemen Bisnis, Volume 11, pp 111-126; doi:10.12928/fokus.v11i1.3593

Abstract:
This study aims to analyze the factors influencing physical evidence on student decisions in choosing the Management Study Program, Faculty of Economics and Business, Universitas Ahmad Dahlan, either simultaneously or partially. This research is explanatory research with a quantitative approach. This study uses multiple analysis tests to find the partial and simultaneous effect between the dependent and independent variables. The validity and reliability used in this study have met the requirements. The results of this study indicate that facility exterior, facility interior, and other tangibles factors influencing the decision to choose the Management Study Program, Faculty of Economics and Business, Universitas Ahmad Dahlan. The result also shows that Physical Evidence Variables are simultaneously influencing the student's decision to choose the Management Study Program, Faculty of Economics and Business, Universitas Ahmad Dahlan.
Pita Rahmawati, Jawoto Nusantoro, Gustin Padwa Sari
Jurnal Fokus Manajemen Bisnis, Volume 11, pp 42-63; doi:10.12928/fokus.v11i1.3234

Abstract:
This research aims to determine whether there are differences in stock prices, stock returns and abnormal returns before and after a stock split in high profile and low profile companies. The research period used in this study was on 2016-2018. The research was analyzed in quantitative method by using a purposive sampling method. Based on the sampling criteria, 40 companies were selected as research samples. Kolmogorov Smirnov One Sample test was used for the normality test. After the normality test was carried out, the data was processed using the two paired-sample difference test. The t-test (paired sample t-test) was used if data were normally distributed but if it was not normally distributed the Wilcoxon Signed Rank test would be used. Hypothesis testing results showed that (1) there are differences in stock prices whether before and after a stock split in high profile companies (2) there are differences in stock prices whether before and after the stock split in low profile companies (3) there are differences in stock returns whether before and after a stock split in the company high profile (4) there is no difference in stock returns whether before and after the stock split in low profile companies (5) there is no difference in abnormal returns whether before and after the stock split in high profile companies (6) there is no difference in abnormal returns whether before and after the stock split in low profile companies (7) there are differences in stock prices after a stock split in high profile companies and low profile (8) there is no difference in stock returns whether before and after the stock split in high profile and low profile companies (9) there is no difference in abnormal stock returns whether before and after a stock split at high profile and low profile companies.
Dhealelia Munandari, Putu Ayu Indira Savitri Suryana
Jurnal REKSA: Rekayasa Keuangan, Syariah dan Audit, Volume 8, pp 1-13; doi:10.12928/j.reksa.v8i1.3395

Abstract:
The purpose of this study was to determine the effect of institutional ownership, insider ownership, government ownership and foreign ownership on the likelihood of companies experiencing financial distress. The sample used is 20 food and beverages companies listed on the Indonesia Stock Exchange for the 2017 - 2019 period. The research method used is using logistic regression analysis. Foreign ownership has a significant influence on the likelihood of financial distress. Meanwhile, institutional ownership, insider ownership and government ownership do not have a significant effect on the likelihood of financial distress in this study.This study aims to determine the effect of institutional ownership, insiderownership, government ownership and foreign ownership on the likelihoodof companies experiencing financial distress. The sample used is 20 foodand beverages companies listed on the Indonesia Stock Exchange for the2017 - 2019 period. The research method used is using logistic regressionanalysis. Foreign ownership has a significant influence on the likelihood offinancial distress. Meanwhile, institutional ownership, insider ownership andgovernment ownership do not have a significant effect on the likelihood offinancial distress in this study.
My Hanh Nguyen Thi, Phung Ton That
TELKOMNIKA (Telecommunication Computing Electronics and Control), Volume 19, pp 608-615; doi:10.12928/telkomnika.v19i2.16519

Abstract:
The most popular method used in the production of phosphor-converted LEDs (pc-LEDs) is dispensing phosphor freely. However, this method is inferior in generating good angular correlated color temperature (CCT) homogeneity. Thus, in this article, a diffuser-loaded encapsulation is proposed as a potential solution for better CCT uniformity. The paper provides a detailed investigation on how melamine formaldehyde (MF) resin and CaCO3 loaded encapsulations impact the uniformity of CCT, as well as the lumen efficacy of pc-LEDs. The results demonstrate that between MF resin and CaCO3 loaded encapsulations, the MF resin yields a higher light diffusion efficiency while the CaCO3 maintains greater lumen efficacy. The photon scattering development is the key force behind the enhancement of the angular CCT uniformity in pc-LEDs’ output when using the loaded encapsulations of MF resin and CaCO3 particles. Since this package utilized mineral, it has reasonable cost and is quite easy to control while still being effective in enhancing the angular CCT homogeneity of pc-LEDs. Diffusers with 1% concentration of MF resin or 10% concentration of CaCO3 are determined as an optimal solution for reducing the variance of angular CCT and increasing the lumen output.
Muhammad Nizam Kamarudin, Nabilah Shaharudin, Noor Haqkimi Abd Rahman, Mohd Hendra Hairi, Sahazati Md. Rozali, Tole Sutikno
TELKOMNIKA (Telecommunication Computing Electronics and Control), Volume 19, pp 638-644; doi:10.12928/telkomnika.v19i2.16118

Abstract:
Power system stability is the capability of power systems to maintain load magnitude within specified limits under steady state conditions in electrical power transmission. In modern days, the electrical power systems have grown in terms of complexity due to increasing interconnected power line exchange. For that, an inherent of controllers were essential to correct the deviation in the presence of external disturbances. This paper hence aims to review the basic concepts of power system stability in load frequency control. Various control techniques were analyzed and presented. Power system stability can be classified in terms of method to improve power system stability, which are rotor angle stability, frequency stability and voltage stability. It is found that each method has different purpose and focus on solving different types of problem occurred. It is hoped that this study can contribute to clarify the different types of power system stability in terms of where it occurs, and which is the best method based on different situation.
Rozniza Ali, Muhamad Munawarar Yusro, Muhammad Suzuri Hitam, Mhd Ikhwanuddin Abdullah
TELKOMNIKA (Telecommunication Computing Electronics and Control), Volume 19, pp 406-413; doi:10.12928/telkomnika.v19i2.16724

Abstract:
Recently, the mud-crab farming can help the rural population economically. However, the existing parasite in the mud-crabs could interfere the long live of the mud-crabs. Unfortunately, the parasite has been identified to live in hundreds of mud-crabs, particularly it happened in Terengganu Coastal Water, Malaysia. This study investigates the initial identification of the parasite features based on their classes by using machine learning techniques. In this case, we employed five classifiers i.e logistic regression (LR), k-nearest neighbors (kNN), Gaussian Naive Bayes (GNB), support vector machine (SVM), and linear discriminant analysis (LDA). We compared these five classfiers to best performance of classification of the parasites. The classification process involving three stages. First, classify the parasites into two classes (normal and abnormal) regardless of their ventral types. Second, classified sexuality (female or male) and maturity (mature or immature). Finally, we compared the five classifiers to identify the species of the parasite. The experimental results showed that GNB and LDA are the most effective classifiers for carrying out the initial classification of the rhizocephalan parasite within the mud crab genus Scylla.
Mahmood F. Mosleh, Riam M. Zaal, Eyad I. Abbas
TELKOMNIKA (Telecommunication Computing Electronics and Control), Volume 19, pp 454-462; doi:10.12928/telkomnika.v19i2.18324

Abstract:
The huge ubiquitous deployment of wireless technologies and the pervasive availability of smart devices, indoor localization has become one of the most interesting topics in numerous location-based services. Where several methods have been adopted to estimate and localize the mobile and user location. The earliest and most interesting method was based on received signal strength (RSS) measurement. However, such method has showed weakness in handling the accurate estimation results. Recently, researchers start gather several different methods to achieve the advantages of each method and achieve higher accurate estimation. Hence, in this paper a hybrid localization algorithm has been designed and proposed based on the use of both RSS and angle-of-arrival (AoA). The algorithm has been tested in a three-dimensional indoor building; we are taking the effects of different building materials. The results were obtained depending on the measurement of RSS and AoA gathered from each received point and by using two AP devices for more accuracy in positioning coordination, the type of the transmitters is directional.
Aws Naser Jaber, Kohbalan Moorthy, Logenthiran Machap, Safaai Deris
TELKOMNIKA (Telecommunication Computing Electronics and Control), Volume 19, pp 491-498; doi:10.12928/telkomnika.v19i2.15948

Abstract:
The detection of genetic mutations has attracted global attention. several methods have proposed to detect diseases such as cancers and tumours. One of them is microarrays, which is a type of representation for gene expression that is helpful in diagnosis. To unleash the full potential of microarrays, machine-learning algorithms and gene selection methods can be implemented to facilitate processing on microarrays and to overcome other potential challenges. One of these challenges involves high dimensional data that are redundant, irrelevant, and noisy. To alleviate this problem, this representation should be simplified. For example, the feature selection process can be implemented by reducing the number of features adopted in clustering and classification. A subset of genes can be selected from a pool of gene expression data recorded on DNA micro-arrays. This paper reviews existing classification techniques and gene selection methods. The effectiveness of emerging techniques, such as the swarm intelligence technique in feature selection and classification in microarrays, are reported as well. These emerging techniques can be used in detecting cancer. The swarm intelligence technique can be combined with other statistical methods for attaining better results.
My Hanh Nguyen Thi, Phung Ton That, Hoang Van Ngoc
TELKOMNIKA (Telecommunication Computing Electronics and Control), Volume 19, pp 616-622; doi:10.12928/telkomnika.v19i2.16706

Abstract:
If remote phosphor structures are put into comparison with conformal phosphor or in-cup phosphor, their luminous flux are better, but the color quality is not as elevated. This leads to an obvious need of a practical solution to enhance color quality. Therefore, many studies were carried out to achieve this purpose, and so is ours. We proposed using two layers of phosphor in WLEDs to achieve better rendering ability and chromatic performance. The identical WLEDs with different color temperatures, 5600 K-8500 K, were used and reported in this paper. Our research consists of two parts, which are placing a layer of red phosphor SrwFxByOz:Eu2+,Sm2+on the yellow YAG:Ce3+ phosphor layer at first, and then specifying an appropriate SrwFxByOz:Eu2+,Sm2+ concentration to reach the highest color performance. It is shown that with the contribution of SrwFxByOz:Eu2+,Sm2+,the color rendering index (CRI) and color quality scale (CQS) are increased. This can be explained by the increased amount of red light components in the WLEDs when the concentration of SrwFxByOz:Eu2+,Sm2+ was greater. However, excessive SrwFxByOz:Eu2+,Sm2+ will cause the reduction in the flux, which has been proven by the application of Mie scattering and the Lambert-Beer law. Therefore, the conclusion will present an optimal amount of SrwFxByOz:Eu2+,Sm2+ to obtain high color quality while minimizing the light loss.
Aadel M. Alatwi, Ahmed Nabih Zaki Rashed, Ismail A. Abd El Aziz
TELKOMNIKA (Telecommunication Computing Electronics and Control), Volume 19, pp 380-389; doi:10.12928/telkomnika.v19i2.16871

Abstract:
This study presents modulated-wavelength division radio signals over fiber with mixed modulation techniques in the transmitter stage. Hybrid optical sources are used to achieve optimal performance and enhancement for an optical fiber communication network. The proposed modulation techniques work at a frequency of 250 GHz. Optical quadrature phase shift keying (OQPSK) and phase modulation (PM) techniques were merged to create OQPSKPM. This was in addition to the minimum shift keying (MSK) modulation scheme that was applied in the proposed model. The modulated wavelength division multiplexing design to four subscribers was examined with a single mode optical fiber at a 1550 nm wavelength. The proposed and previous simulation models were executed, investigated and measured on important operating parameter quantities that expressed the behavior of the optical fiber network in detail, like maximum quality factor, minimum bit error rate, and output power. The obtained simulation results demonstrated the priority of the proposed simulation model.
Ayom Widipaminto, Yohanes Fridolin Hestrio, Yuvita Dian Safitri, Donna Monica, Dedi Irawadi, Rokhmatuloh Rokhmatuloh, Djoko Triyono, Erna Sri Adiningsih
TELKOMNIKA (Telecommunication Computing Electronics and Control), Volume 19, pp 690-704; doi:10.12928/telkomnika.v19i2.18155

Abstract:
The current urban environment is very dynamic and always changes both physically and socio-economically very quickly. Monitoring urban areas is one of the most relevant issues related to evaluating human impacts on environmental change. Nowadays remote sensing technology is increasingly being used in a variety of applications including mapping and modeling of urban areas. The purpose of this paper is to classify the Pleiades data for the identification of roof materials. This classification is based on data from satellite image spectroscopy results with very high resolution. Spectroscopy is a technique for obtaining spectrum or wavelengths at each position from various spatial data so that images can be recognized based on their respective spectral wavelengths. The outcome of this study is that high-resolution remote sensing data can be used to identify roof material and can map further in the context of monitoring urban areas. The overall value of accuracy and Kappa Coefficient on the method that we use is equal to 92.92% and 0.9069.
M. M. Hasan Mahfuz, Shazzadul Islam, Islam Md. Rafiqul, Mohamed Hadi Habaebi, Nazmus Sakib
TELKOMNIKA (Telecommunication Computing Electronics and Control), Volume 19, pp 357-363; doi:10.12928/telkomnika.v19i2.18147

Abstract:
Recently lower frequency band 4.5−5.5 GHz is proposed by the ASEAN countries for 5G cellular application and therefore, it is essential of designing an ultra-wideband (UWB) antenna for the particular band-notched characteristics. In this article, a compact tuning fork shape ultra-wideband (UWB) patch antenna with a variable band-notched characteristic has been proposed for 5G cellular application. The UWB antenna has been achieved by using a tuning fork shape with a simple partial ground plane. A pair of ring shape slits (RSS) on the ground plane has been added to achieve the band-notched characteristic. The proposed antenna has achieved a large −10 dB bandwidth of 7.8 GHz (2.9−11 GHz) and the VSWR value is less than 2 for the entire bandwidth excepted for notched frequency bands of lower 5G bands (4.5−5.5 GHz). Moreover, the antenna has a peak radiation efficiency of more than 87% for UWB and less than 27% for the notched frequency band. The notched-band is shifted with the change in the position of RSS’s within the vertical axis and thus, the variable band-notched characteristics have been achieved. Besides, the proposed antenna is compact with the dimension of 45×34 mm2 that makes it suitable for the lower band of 5G application.
My Hanh Nguyen Thi, Phung Ton That
TELKOMNIKA (Telecommunication Computing Electronics and Control), Volume 19, pp 599-602; doi:10.12928/telkomnika.v19i2.16755

Abstract:
TiO2 nanoparticle and silicon composite has powerful effect of scattering, thus it is famous in enhancing the scattered light in light-emitting diode (LED) packages. To accomplish higher lighting performance in LED devices, a thin encapsulation layer of TiO2 with high concentration and silicon glue is introduced to complement the main encapsulation one. After conducting experiments, the results present that in the case of the main encapsulation including only silicone, the light extraction efficiency (LEE) of COB LEDs increases to 65%. On the other hand, when there is the additional layer of TiO2 and silicone, the improvement of LEE depends on the concentration of TiO2. As this nanoparticle concentration decreases from 0.12 to 0.035 g/cm3, the LEE can be enhanced from 6% to 24%. Moreover, at the average correlated color temperature (CCT) of approximately 8500 K, the layer of TiO2/silicone composite can help to accomplish the reduction of the angular correlated color temperature (CCT) deviation, from 900 to 470 K, within −90° to 90° viewing angle range.
Mohamed A. Abdulhamed, Hadeel I. Mustafa, Zainab I. Othman
TELKOMNIKA (Telecommunication Computing Electronics and Control), Volume 19, pp 444-453; doi:10.12928/telkomnika.v19i2.16738

Abstract:
The problem of unemployment is one of the most important problems faced by most countries of the world, and it is one of the intractable problems in developing countries, and in Iraq unemployment occupies great importance due to its high rates. This problem in itself is a serious condition, because it results from mismanagement and the structure of the economy, and despite its great importance, it has not been carefully monitored. There are studies and strategies that deal with the analysis and study of those causes that lead to this problem, such as traditional statistical methods, various mathematical and statistical methods, in this research proposed a method uses machine learning methods to find the factors that affect the causes of this problem, as well as the multiple linear regression method.
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