bluuebunny/crossref_metadata_2025 huggingface dataset:
The mystery of Copernicus’ star catalogue (The second part) The system of time and determination of the Earth’s triple motion
Authors: Tolchelnikova S.A.
Published: July 2020

Objecting to those who consider Copernicus’s work as repeating the achievements of Antiquity, we pay attention to his determination of uniform time necessary for applying any mathematical theory in particular, the one describing the observed uneven movements through a composition of circular and uniform rotations. Using the Egyptian year of 365 solar days, Copernicus analyzed the observations for the period from the first Olympiad up to his own observations. Generalizing the results of observations of two millennia and reducing them to the unique time system enabled his explaining the observed precession of equinoxes, and changes in the angle of inclination of the Earth’s equator to ecliptic by the lag of the Earth’s center rotation from that of its axis, simultaneously to exclude empty spheres from the medieval mechanical models of the Universe. Analyzing the observations of the period 4 times longer than that of Ptolemy, Copernicus managed to obtain the mean value of precession and the period of the Earth axis rotation practically coinciding with modern determinations. The proof of “the triple motion of the Earth” was necessary for affirmation of heliocentric system of the world.
SIMULATION AND EXPERIMENTAL INVESTIGATION OF WRINKLE DEFECT IN DEEP DRAWING PROCESS OF CARBON STEEL SPCC SHAPED CYLINDER FLANGE CUP
Authors: Mulyanto Bambang , Khaerudini Deni Shidqi
Published: July 2020

A Sheet Metal Forming (SMF) process, especially deep drawing, is one of the manufacturing processes that commonly used in the automotive industry. Compared with casting and forging, the SMF process has several advantages, including lesser weight materials and broader variations in shape that can be made. One of the problems in the SMF process is the wrinkling phenomenon, which can cause the size and appearance defects of sheet products. The wrinkle occurs because of the mechanical properties of the material, product geometry, and blank holder force (BHF). Several variations of BHF were applied in these simulations and experiments to eliminate the wrinkle defects of cylinder flange cup test products. The characteristic of the cylinder flange cup is from the cold-rolled coiled steel plate (SPCC) type of material with a thickness of 0.8 and 1.0 mm, the height of 10 mm, the inner diameter of 58 mm, and flange diameter of 76 mm. Simple simulations of the SMF process were carried out by using Solidworks with version 2017, and the experiment was carried out at a 600 kN press with a punch velocity of 40 strokes per minute and blank holder force variations from 0 to 21 kN. The experimental data performed with a single die on a flanged cup cylindrical test material shows that the higher the blank holder force (BHF) number, the smaller the wrinkle defect, and it can be eliminated starting from the BHF number of 15 kN.
The role of corporate governance in emerging market: Tax avoidance, corporate social responsibility disclosures, risk disclosures, and investment efficiency
Authors: Firmansyah Amrie , Triastie Gitty Ajeng
Published: July 2020

This study aims to examine the effect of tax avoidance, corporate social responsibility disclosures, and risk disclosures on investment efficiency. This study also examines the role of corporate governance in the association between tax avoidance, corporate social responsibility disclosures, risk disclosures, and investment efficiency. This study uses multiple linear regression with panel data. The sample uses 43 manufacturing companies listed on the Indonesian Securities Exchange from 2014 up to 2017 so that the total sample in this study amounted to 172 firm-years. The result suggests that tax avoidance is negatively associated with investment efficiency. However, corporate social responsibility disclosures and risk disclosures do not affect investment efficiency. Furthermore, another result suggests that corporate governance failed to moderate the effect of tax avoidance on investment efficiency. Besides, corporate governance can weaken the negative influence of corporate social responsibility disclosures on investment efficiency as well as corporate governance drives the negative effect of risk disclosures on investment efficiency.
A modified ABC algorithm for solving optimal power flow problem
Authors: Hardiansyah Hardiansyah
Published: July 2020

This paper presents a modified artificial bee colony (MABC) algorithm for
solving the optimal power flow (OPF) problem in power system. Artificial bee
colony algorithm is a recent population-based optimization method which has
been successfully used in many complex problems. A new mutation strategy
inspired from the differential evolution (DE) is introduced in order to
improve the exploitation process. The new algorithm is implemented to the
OPF problem so as to minimize the total generation cost when considering the
equality and inequality constraints. In order to validate of the proposed
algorithm, it is applied to the standard IEEE 30-bus test system. The
results show that the proposed technique provides better solutions than
other heuristic techniques reported in literature.
Design and analysis of a novel miniaturized microstrip fractal antenna for WLAN/WiMAX applications
Authors: Mezache Zinelabiddine , Slimani Asma , Benabdelaziz Fatiha
Published: July 2020

This paper is a new comparative study via numerical calculations and
experimental measurements of various designs of fractal antennas. The
geometry of the antennas dual?broadband (2.5/5.77 GHz and 2.4/6.18 GHz) for
WLAN/ WiMAX applications is inspired by the Sierpinski carpet and the
Minkowski. The simulated and measured results show a good agreement over the
bandwidth. We also performed a comparison with current comparable antenna
designs, demonstrating the superiority of the proposed antenna regarding
applicability in telecommunication technology.
Simultaneous and alternative IgG seroreactivity against Helicobacter pylori antigens VacA ,30 kDa and 50 kDa is a better biomarker approach for the outcome of infection than VacA and 50 kDa alone
Authors: Manojlovic Nebojsa , Tufegdzic Ivana , Ristanovic Elizabeta , Bokonjic Dubravko
Published: July 2020

Background/Aim. In our previous study, IgG seropositivities against Helicobacter (H) pylori antigens VacA, 50 kDa, 30 kDa, and 26 kDa were highlighted as biomarkers for the specific outcome of infection. We designed and conducted this study in order to investigate whether synchronous and/or alternative seroreactivity against H. pylori antigens VacA, 50 kDa, 30 kDa and 26 kDa in patients with gastric cancer and peptic ulcers exhibit stronger association than with dyspepsia and vice versa. Methods. In order to determine IgG antibodies to H. pylori antigens, a Western blot test was performed in 123 patients: 31 with gastric cancer, 31 with duodenal ulcer, 31 with gastric ulcer and 30 with functional dyspepsia. We analyzed IgG sero-reactivity against four H. pylori antigens (VacA, 50 kDa, 30 kDa, 26 kDa) in their synchronous/alternative combination as well as seroreactivity to synchronous and alternative combinations of H. pylori antigens between a group with functional dyspepsia and others. The analysis of diagnostic characteristics of the best synchronous and alternative seroreactivity combination was done, and tested versus VacA a s biomarker for gastric cancer and peptic ulcer, and 50 kDa as a biomarker for dyspepsia. Results. VacA seropositivity or 50 kDa seronegativity (p = 0.015) and VacA seropositivity or 50 kDa and 30 kDa seronegativity (p =0.044) had the better diagnostic characteristics with statistically significantly better fraction correct than VacA seropositivity alone. VacA seronegativity along with50 kDa and 30 kDa seropositivity (p = 0.003), 50 kDa seropositivity (p = 0.01), 30 kDa seropositivity (p = 0.015) and 50 kDa or 30 kDa seropositivity (p = 0.02) had better diagnostic characteristics and significantly better fraction correct than 50 kDa seropositivity alone. Conclusion. Simultaneous and alternative IgG seroreactivity/unreactivity against H. pylori antigens VacA, 50 kDa and 30 kDa have stronger association with the specific infection outcome, considering gastric cancer and peptic ulcer, or dyspepsia, than VacA and 50 kDa IgG seropositivity alone.
Renk Açma ve Vernikleme İşleminin Bazı Ahşap Malzemelerde Kor Halde Yanma Sıcaklığına Etkileri, Bölüm 2
Authors: YALINKILIÇ Ahmet Cihangir , AKSOY Eyüp , ATAR Musa , KESKİN Hakan
Published: July 2020

Bu çalışma, ahşap malzemede renk açma ve vernikleme işleminin kor halde yanma sıcaklığına etkilerini belirlemek amacıyla yapılmıştır. Bu maksatla, Doğu kayını (Fagus orientalis Lipsky) ve sarıçam (Pinus sylvestris Lipsky) ve sapsız meşe (Querqus petraea Liebl.) odunlarından ASTM D 358 esaslarına uyularak hazırlanan örneklere sodyum hidroksit (NaOH), hidrojen peroksit (H2O2), kalsiyum hidroksit (CaOH2), sodyum silikat (NaSiO3), asetik asit (CH3COOH), sodyum disülfit (Na2S2O5), oksalik asit (H2C2O4) ve potasyum permanganat (KMnO4)’ın % 18’lik çözeltisi ile renk açma işlemi yapıldıktan sonra, ASTM D 3023 esaslarına göre su bazlı (Sb), sentetik (Sn), poliüretan (Pü) ve akrilik (Av) vernikler uygulanmış ve korhali yanma özellikleri ASTM E 160–50 esaslarına göre belirlenmiştir. Sonuç olarak, kor hali yanma sıcaklığı; ahşap türü, renk açma gereci ve vernik çeşidi etkileşimine göre en yüksek sapsız meşe+R3+Sentetik vernikte, en düşük Doğu kayını+R1+Su bazlı vernikte elde edilmiştir. Buna göre, yangına dayanıklı olması istenen ahşap ürün uygulamalarında, R3 (NaSiO3+H2O2) ile renk açma işlemi yapılıp sentetik vernik ile kaplanmış sapsız meşe kullanımı önerilebilir.
Potency of Creative Industry Embroidery and Weaving in West Sumatera in Developing the Common Economy
Authors: Rahmidani Rose
Published: July 2020

The aims of this research are: 1) to describe the portrait of embroidery and weaving business in absorbing workforce in West Sumatera, 2) Exploring and formulating problems as well as mapping the needs assessment of embroidery/embroidery creative industry and Minangkabau weave. Population in this research is the entire business unit of embroidery and weaving industry in West Sumatera spread in Padang Pariaman, Agam, Tanah Datar, Sawahlunto, Padang, Payakumbuh, Bukittinggi and Pariaman, the sample is 93 business units spread in 8 regencies and cities above. This study uses a qualitative method. Data collection using survey methods, with qualitative descriptive analysis techniques. The results of this research are; 1) Embroidery and weaving business in West Sumatera are able to absorb 2.297 workforce, 2) Problems faced by embroidery and weaving business in West Sumatra can be formulated as follows: 1) Bookkeeping/finance aspect and management, 2) Production aspect, and 3) Marketing aspect
Pengaruh Disclosure dan Manajemen Laba terhadap Cost of Capital
Authors: Kurniawati Tri , Putri Nadia Ayu Rifani
Published: July 2020

This study is aimed to analyze the influence of disclosure and earnings management on cost of capital. The population of this study is the real estate companies which is listed at the Indonesia Stock Exchange (IDX) and the sample is determined by purposive sampling. The samples consist of 28 companies in 2013-2015. Disclosure is measured by Disclosure Index, earnings management is measured by discretionary accrualls and cost of capital is estimated by EBO model. The research hypotheses are tested by using multiple regression. The results of this research indicate that (1) disclosure has no significant influence on the cost of capital, and (2) earnings management has positive and significant influence on cost of capital.
Kompetensi Literasi Digital Mahasiswa STKIP ‘Aisyiyah Riau
Authors: Murdy Khairi , Putri Asri Neli
Published: July 2020

This research is to study the digital literacy competence of all STKIP Aisyiyah Riau students. This research was conducted using quantitative descriptive. Data obtained using a questionnaire filled out by students. Data were analyzed by calculating the Respondents' Level of Achievement. The results of this study indicate the digital literacy ability of students viewed from the indicator Internet Search, Hypertext Directions, Information Content Evaluation, and Knowledge Assembly shows a value of 77.1 and this value corresponds to the High category.
Pengaruh Sudut Potong dan Kecepatan Putaran Spindel Terhadap Kekasaran Permukaan pada Proses Bubut Mild Steel ST 37
Authors: A Yufrizal , Indrawan Eko , Helmi Nofri , Aziz Abdul , Putra Yoga Amanda
Published: July 2020

The surface quality of turning can be influenced by several factors such as determining the spindle rotation speed, determining cutting speed (cutting speed), cut angle. the purpose of this study was to compare the level of surface roughness in the mild steel ST 37 on lathe process. Every surface of the workpiece that undergoes a machining process will experience varying degrees of roughness. This research is an experimental study that compares the level of surface roughness of material material Mild Steel ST 37. Material that is done with a length of 70 mm, and turned into a diameter of 20 mm using 3 kinds of cutting angles and 3 kinds of spindle rotation speed. Measuring the surface roughness of the workpiece, namely surface tester mitutoyo SJ-201P. The results of this study can be concluded that the spindle rotation speed of 740 rpm with 80˚ cutting angle produces a smoother surface that is (∑Rap) = 5.76 μm or in the roughness class N9 while the spindle rotation speed is 440 rpm with 80 potong cutting angle produces a surface coarse (∑Rap) = 11.47 μm with N10 surface roughness class.
Analisis Kemampuan Pedagogi Guru SMK yang sedang Mengambil Pendidikan Profesi Guru dengan Metode Deskriptif Kuantitatif dan Metode Kualitatif
Authors: Isnawati Isnawati , Jalinus Niswardi , Risfendra Risfendra
Published: July 2020

Abstract— This research aims to analyze the mastery level of pedagogical competence of PPG teachers of SMK, Faculty of Engineering, Universitas Negeri Padang. The research method used was quantitative descriptive and qualitative methods. The data collection techniques were by using a questionnaire, interviews, observation, and documentation. The results of this research showed that the pedagogical competence of PPG teachers of SMK was still low as seen from the average score of each indicator categorized in the less powerful category. The results of this study can be used as an illustration for the future of the learning of PPG teachers of SMK by lecturers in improving the mastery of pedagogical competence.

Keywords : Pedagogical  Competence,  PPG,  Teachers  of SMK
Implementasi Model STEMPROCSI Studi Kasus Pada Program Studi Pendidikan Teknik Informatika dan Komputer
Authors: Suryani Karmila , Khairudin Khairudin
Published: July 2020

This study is an implementation of the STEMProcsi model that aims to 1) Knowing the students ' understanding of learning Science, Technology, Engineering, and Mathemetic, Projects and Simulation (STEMProcSi). 2) to measure student skills in using the STEMProcsi components that produce a project, and 3) Assessing students' attitudes towards the STEMProcSi learning model. This research used 15 students as sample of Computer and Informatics Engineering Education (PTIK) in the odd semester of the academic year 2019/2020. The research procedure was carried out in trhee steps; 1) provides problems that are solved by concept maps using the XMIND application, 2) Complete calculations using the Microsoft Excel application, and 3) Create interactive products with the Scatch application. The research instrument uses a questionnaire with 5 liker scale. Based on data analysis, the results of this study indicate that the application of the STEMProcSi model can generate interest and enthusiasm of students in understanding the material, practice critical thinking, creative, communicative and collaborative and can produce an interactive product. Therefore it can be concluded that the STEMProcsi model is good to be used in the learning process for exact subject courses in tertiary institutions.
Pengembangan Media Pembelajaran Berbasis Mobile Learning Pada Mata Pelajaran Dasar Listrik Dan Elektronika Sekolah Menengah Kejuruan
Authors: Sumiati Mery , Rizal Fahmi , Anwar Muhammad
Published: July 2020

In the learning process Basic Electricity and Electronics material, students are constrained in understanding the subject matter, because it uses formulas that are difficult to understand without adequate supporting learning media. Besides the learning time Basic Electricity and Electronics material which is only available 4 hours per week, so that not all materials can be delivered optimally to students. Therefore learning needs to be supported by suitable and adequate media. The purpose of this research is to produce a learning media based on mobile learning that is valid, practical and effective for Basic Electricity and Electronics subjects.

The method used in this research is Research and Development (R&D). The development model used follows the Borg & Gall model which is arranged in several research steps. The instrument used in the form of a validation questionnaire was given to material experts and media experts. Questionnaire to measure practicality is given to students and teachers of the subject matter. To measure the effectiveness of the Quasi experiment research design used by comparing student learning outcomes of the experimental class and the control class.

The results showed that the learning media based on mobile learning was declared valid, practical and effective for use in the Basic Electricity and Electronics subjects.
Perancangan Media Interaktif Gerak Tari Topeng Patih pada Wayang Topeng Malangan Menggunakan Sensor Kinect
Authors: Fajri Bayu Ramadhani , Samala Agariadne Dwinggo , Ranuharja Fadhli
Published: July 2020

Tari Topeng Patih is a part of the traditional dance performance art “Wayang Topeng Malangan” with a religious background which grew up around people in Malang City, East Java. Presently, art gallery of Tari Topeng Malangan has been difficult to be found. In addition to the difficulty of finding this art gallery even in the regions of origin, the problems is also about the interest and enthusiastic public, especially teenagers in Malang to learn this dance is still very rare. As a result, this art is slowly deteriorated and increasingly falling by the presence of various modern performances. In regarded to learn Tari Topeng Patih, the conventional learning activities requiring a special place such as a dance studio that is generally located far away from downtown Malang. Thus to overcome this problem is requires an instructional media that can be used as an alternative solution to learn and obtain information about Tari Topeng Patih, one way may be able to use the simulation method by utilizing the technology and education. The results of the design is the interactive media learning and simulation for basic motion of Tari Topeng Patih by using Kinect media.
Pengembangan Aplikasi Kehadiran Mahasiswa Berbasis Web Pada Program Studi Pendidikan Teknologi Informasi dan Komputer
Authors: Marlianto Ferry , Sulistiyarini Dewi , Sabirin Febrianto
Published: July 2020

Through Aplikasi Kehadiran Mahasiswa Teknologi Informasi dan Komputer (AKEMATIK), Education of Technology Information and Computer Program on IKIP PGRI Pontianak can facilitate lecturers in filling teaching journals and monitoring student attendance, while also helping to prepare lecture reports that will help evaluation of teaching and learning in the Program Studi P.TIK IKIP PGRI Pontianak. The research aims to: 1) provide an overview of the application development process; and 2) find out the feasibility of the application. Application development uses the ADDIE model which consists of 5 stages: 1) Analysis; 2) Design; 3) Development; 4) Implementation; and 5) Evaluation. Based on this model it is known that the application has 3 actors namely admin, lecturer, and student. Application testing is done by validating media experts, and alpha testing. The results of expert validation were in the excellent category. The alpha test was conducted on 15 lecturers and 30 students of P.TIK, the results were in the excellent category.
Pengembangan Media Pembelajaran Berbasis Android pada Pembelajaran Electronic Fuel Injection
Authors: Handoyono Nurcholish Arifin , Mahmud Ali
Published: July 2020

Penelitian bertujuan untuk mengetahui kelayakan dan keefektifan media pembelajaran berbasis android dalam proses pembelajaran. Jenis penelitian adalah R&D dengan model 4D. Subjek penelitian yaitu siswa kelas XI Teknik Kendaraan Ringan di SMK Perindustrian Yogyakarta yang terdiri dari 30 siswa. Teknik analisis data menggunakan uji N gain. Hasil penelitian menunjukan bahwa hasil validasi oleh ahli media mendapatkan nilai rata-rata presentase 83,74%, dari ahli materi dari dosen mendapatkan nilai rata-rata presentase 93,1%, ahli materi dari guru mendapatkan nilai rata-rata persentase 92,67%, uji coba kelompok kecil dengan jumlah responden 10 siswa diperoleh nilai rata-rata presentase 81,77%, uji coba kelompok besar dengan jumlah respoden 30 siswa mendapatkan nilai rata-rata persentase 84,4%, sehingga seluruhnya mendapatkan penilaian “sangat baik” dan Media pembelajaran ini efektif diterapkan dalam pembelajaran.
Optimization of Parking Capacities at Railway Station Using Firefly Algorithm
Authors: Shariffuddin Dang Suria , Mohamad Nor Nor Azriani , Moktar Balkiah
Published: July 2020

In present years, many cities face way more challenges than before especially those related to themobility of people and land usage. Parking management which links transportation and land use is one ofthe most challenging problems to encounter. Parking can be a nuisance when there is a shortage ofavailable parking spaces, especially during peak hours. The main challenge is the scarcity andmanagement of parking spaces. This is because of the unmet demand due to lack of parking spaces andineffective use of available facilities. It is a common issue in overcrowding area where drivers need toface this critical situation as the parking spaces provided are not enough to support the increasingnumber of the automobile on roads due to economic growth. KTMB Ipoh faced the same situationespecially during peak hours where the parking area is always congested with drivers who drive incircles to find a parking spot. The average time spent by drivers to find the parking spot is estimated to behalf an hour. Thus, this research is done to help the parking management team to improvise the efficiencyof parking spaces provided to optimize the parking area. Furthermore, the purpose of this study is tomaximize the number of parking. A firefly algorithm method is used to find the maximum number ofparking lot that can optimize the parking area. It is shown that with the current parking area, the numberof parking spaces can be increased by 48 lanes which can optimize the parking spaces to the fullest.

Keywords: firefly algorithm, parking spaces, optimization.
Lecturer Support and Self-Efficacy on Students’ Off-Classroom Training Effectiveness
Authors: Sarkam Saida Farhanah , Abas Norlela , Daud Siti Rohana , Mohamed Noor Azzura , Wahab Nurul Aini
Published: July 2020

Off-classroom training is important to sharpen the soft skills of university students. The study discussedthe relationship of lecturer support and self-efficacy with training effectiveness of students outside theclassroom. The scope of study was 314 agriculture students taking human resource management course.The study applied quantitative research method and underpinned by training engagement theory, whichconsiders both internal and external factors in evaluating training effectiveness. The findings wereanalyzed using IBM-SPSS v 24 software. The findings showed that both variables significantly influencedtraining effectiveness, and self-efficacy influenced training effectiveness more than lecturer support. It isconcluded that the understanding of the best factor influencing training effectiveness will assist lecturersin designing suitable training programs for the students in the future.

Keywords: lecturer support; self-efficacy; off-classroom training; training effectiveness; training engagement theory
Highlighting Human as a Servant to God in ‘Hari yang Bergelar Kematian’ Short Story: Based on Takmilah Theory
Authors: Mohammad Yusoff Mohd Haniff
Published: July 2020

This study attempts to identify and deconstruct the aesthetics of a short story based on the principlesadvocated in the Takmilah theory. Short story is a genre of creative writing that writers choose to conveytheir thoughts in a shorter medium of delivery than a novel. Islamic narratives raise the question of divinityas well as the relationship between man and the Creator and the relationship between man and man. Ashort story entitled ‘Hari yang Bergelar Kematian’ from Juri Durabi was selected as the research data inthis study. This short story was published in Mingguan Malaysia newspaper on March 12, 2017 and hasbeen recognized as one of the winners of Hadiah Sastera Kumpulan Utusan (HSKU) 2017. Takmilah theoryoutline founded by Shafie Abu Bakar has been selected in this study to achieve the objectives of this study.The findings of the study show that the short story which is entitled ‘Hari yang Bergelar Kematian’ complieswith the principles in Takmilah theory, even highlighting human as a servant to God.

Keywords: Short story, Malay literature, Takmilah theory, Juri Durabi
Decolourization of Turqoise Blue (Remazol Blue BB) Dye by Immobilized Penicillium sp. into Sodium-Alginate-Sulfate Beads
Authors: Ahmad Nasir Nor Atikah Husna , Che Pa Noor Farazian Zafira , Roslani Muhammad Akmal , Ramli Rohayu , Mohd Zain Nor Azimah
Published: July 2020

Turqoise blue (Remazol Blue BB) is a type of common dye which is constantly discharged from industriesinto the water bodies without proper treatment. This dye could affect aquatic and human life due to itstoxicity. Existing methods to overcome this issue are too expensive and not eco-friendly. Alternatively, thisstudy was conducted by immobilizing Penicillium sp. into sodium-alginate-sulfate beads (IC) to decolorizethe turquoise blue dye at 10 ppm. The percentage of dye decolourization, Chemical Oxygen Demand (COD)removal and laccase of IC and free cells were analysed throughout this study. IC successfully decolourizeddyes up to 72.83%, meanwhile, free cells could only decolourized dyes up to 56.59%. In addition, CODremoval by IC cell is 31.92% higher compared to free cell. For laccase activity, IC is higher compared tofree cells up to 30%. Based on higher decolourization, enzymatic activity and COD removal, IC has apotential to be an alternative to decolourize dyes better than free cells.

Keywords: immobilized cells, free cells, decolourization, dyes, laccase
An Exploratory Study of Hierarchical Fuzzy Systems Approach in A Recommendation System
Authors: Razak Tajul Rosli , Abd Halim Iman Hazwam , Jamaludin Muhammad Nabil Fikri , Ismail Mohammad Hafiz , Mohd Fauzi Shukor Sanim
Published: July 2020

Recommendation system, also known as a recommender system, is a tool to help the user in providing asuggestion of a specific dilemma. Recently, the interest in developing a recommendation system in manyfields has increased. Fuzzy Logic system (FLSs) is one of the approaches that can be used to model therecommendation systems as it can deal with uncertainty and imprecise information. However, one of thefundamental issues in FLS is the problem of the curse of dimensionality. That is, the number of rules inFLSs is increasing exponentially with the number of input variables. One effective way to overcome thisproblem is by using Hierarchical Fuzzy System (HFSs). This paper aims to explore the use of HFSs forRecommendation system. Specifically, we are interested in exploring and comparing the HFS and FLS forthe Career path recommendation system (CPRS) based on four key criteria, namely topology, the numberof rules, the rules structures and interpretability. The findings suggested that the HFS has advantagesover FLS towards improving the interpretability models, in the context of a recommendation systemexample. This study contributes to providing an insight into the development of interpretable HFSs in theRecommendation systems.

Keywords: Fuzzy Logic Systems, Hierarchical Fuzzy Systems, Recommendation Systems
Eksplorasi Software R Untuk Fitting Semivariogram Spherical Menggunakan Pemrograman Linear dan Uji Analisis Sensitivitas
Authors: WKM Tegar Bratasena , Chaerani Diah , Ruchjana Budi Nurani
Published: July 2020

Semivariogram adalah diagram setengah variansi dari observasi spasial yang beradapada suatu jarak tertentu. Model ini digunakan untuk mendeskripsikan kolerasispasial. Pada Model Semivariogram terdapat dua parameter yaitu sill dan range.Semivariogram terdiri dari semivariogram eksperimental dan semivariogram teoritis.Dalam makalah ini dikaji Eksplorasi Software R untuk Fitting SemivariogramSpherical menggunakan Pemrograman Linear dan Uji Analisis Sensitivitas. Hasiloptimal diperoleh dari meminimumkan Nilai Error Semivariogram Eksperimentalterhadap Semivariogram Spherical. Setelah mendapatkan hasil error yang optimal laludilakukan uji Analisis Sensitivitas. Untuk studi kasus, Model Semivariogramditerapkan pada data penyebaran abu vulkanik dari Gunung Tambora dan dihitungdengan menggunakan bantuan software R. Hasil eksperimen numerik menunjukkanbahwa estimator yang optimal dapat diperoleh dengan menyelesaikan permasalahanPemrograman Linear yang dibangun.
Sistem Diagnosa Penyakit Dalam dengan Menggunakan Jaringan Saraf Tiruan Metode Backpropagation dan Learning Vector Quantization
Authors: Leleury Zeth Arthur , Lesnussa Yopi Andry , Madiuw Julianty
Published: July 2020

Jaringan saraf tiruan telah banyak digunakan untuk membantu menyelesaikan berbagaimacam permasalahan dalam rangka pengambilan keputusan berdasarkan pelatihan yangdiberikan. Jaringan saraf tiruan dapat diaplikasikan pada berbagai bidang dalam kehidupanmanusia, salah satunya bidang kesehatan. Dalam penelitian ini, jaringan saraf tiruandigunakan untuk mendiagnosa Penyakit Dalam dengan menggunakan metode Backpropagationdan Learning Vector Quantization yang selanjutnya akan dibandingkan hasil diagnosa darikedua metode tersebut. Data penelitian sebanyak 266 data, dengan 190 data sebagai datapelatihan dan 76 data sebagai data pengujian yang diambil dari data pasien RSUD Dr. M.Haulussy, Ambon. Dengan menggunakan metode Backpropagation tingkat keakuratandiagnosanya sebesar 61.84% sedangkan dengan menggunakan metode LVQ tingkat keakuratandiagnosanya sebesar 93.42%. Dari hasil penelitian ini metode LVQ dianggap lebih baik dalammendiagnosa Penyakit Dalam.
Model Optimisasi Portofolio Investasi Mean-Variance Tanpa dan Dengan Aset Bebas Risiko pada Saham Idx30
Authors: Basuki Basuki , Sukono F , Carnia Ema
Published: July 2020

Dalam paper ini, model optimisasi portofolio investasi Mean-Variance tanpa aset bebas risiko, ataudisebut model dasar dari Markowitz telah dikaji untuk mendapatkan portofolio optimum.Berdasarkanmodel dasar dari Markowitz, kemudian dilakukan studi lebih lanjut pada model Mean-Variance denganaset bebas risiko. Selanjutnya, kedua model tersebut digunakan untuk menganalisis optimisasi portofolioinvestasi pada beberapa saham IDX30. Dalam paper ini diasumsikan bahwa proporsi sebesar 10%diinvestasikan pada aset bebas risiko, berupa deposito yang memberikan return sebesar 7% per tahun.Berdasarkan hasil analisis optimisasi portofolio investasi pada lima saham yang dipilih didapatkan grafikpermukaan efisien dari optimisasi portofolio Mean-Variance dengan aset bebas risiko, berada lebih tinggidibandingkan optimisasi portofolio Mean-Variance tanpa aset bebas risiko. Dalam hal ini menunjukkanbahwa portofolio investasi kombinasi dari aset bebas risiko dan aset tanpa bebas risiko, lebihmenguntungkan dibandingkan portofolio investasi yang hanya pada aset tanpa bebas risiko.
Keterkaitan Grup Spesial Uniter dengan Grup Spesial Ortogonal
Authors: Faurani Nuraesa Nufus , Carnia Ema , Supriatna Agus
Published: July 2020

Grup Lie merupakan grup yang berisikan matriks yang merepresentasikan pergerakan atauperputaran suatu titik terhadap sumbu koordinat atau sumbu koordinat terhadap suatu titik. Grup spesialuniter dan grup spesial ortogonal merupakan contoh grup Lie. Dalam kajian fisika, grup spesial uniter dimensidua (��(2)) merepresentasikan rotasi elektron terhadap pusat rotasinya. Sedangkan grup spesial ortogonaldimensi tiga (��(3)) merepresentasikan rotasi elektron terhadap inti atom. Dalam paper ini, akan dikajiketerkaitan antara kedua grup ini dengan menggunakan Teorema Isomorfisma sehingga diperolah hasil bahwaterdapat homomorfisma surjektif dari grup ��(2) ke grup ��(3) kemudian dapat ditunjukkan bahwa��(2)���(�) isomorfik dengan SO(3).
Implementasi Cell ID dan GPS dalam Pencarian Lokasi Fasilitas Kesehatan Terdekat
Authors: Permana Fahmi Candra , Chaerani Diah , Paulus Erick
Published: July 2020

Cell ID dan GPS merupakan layanan berbasis lokasi dan teknologi yang banyak membantu manusia dalam hal navigasi dan penemuan tempat-tempat yang bermanfaat di sekitarnya. Salah satu komponen utama dari teknologi ini dapat diterapkan pada telepon seluler. Dalam penelitian ini, dirancang sebuah aplikasi dengan memanfaatkan teknologi berdasar implementasi dari Cell ID dan GPS untuk mengetahui posisi user dan lokasi fasilitas kesehatan terdekat di sekitar user dan penggunaan JSON sebagai sarana untuk menyimpan database pada web. Aplikasi ini diimplementasikan pada telepon seluler dengan sistem operasi Android. Hasil dari penelitian ini menunjukkan bahwa Cell ID dan GPS dapat diimplementasikan dengan baik dengan memanfaatkan akses Internet dan Google Maps untuk mencari fasilitas kesehatan terdekat dan menggambarkan daerah sekitar user.
Penerapan Model Harga Opsi Black-Scholes dalam Penetapan Premi Asuransi Jiwa Berjangka Unit Link
Authors: Annisa Felfin Ulfah , Riaman - , Subartini Betty
Published: July 2020

Asuransi merupakan salah satu lembaga yang memiliki peran penting dalam kehidupan manusia karena disetiap waktu selalu ada resiko yang tidak bisa dihindari, termasuk kematian. Untuk mengantisipasi akibat setelah terjadinya resiko tersebut diperlukan suatu jaminan untuk biaya kehidupan selanjutnya, maka asuransi jiwa adalah pilihan yang tepat. Salah satunya adalah asuransi jiwa berjangka unit link yang merupakan produk asuransi yang menggabungkan fungsi proteksi dan fungsi investasi. Nilai manfaat yang diberikan oleh asuransi unit link bergantung pada nilai aset yang digunakan sebagai instrumen investasi. Dalam skripsi ini dibahas penerapan model Black-Scholes dalam penetapan premi asuransi jiwa berjangka unit link baik tanpa garansi maupun dengan garansi. Hasil simulasi numerik menunjukkan bahwa premi asuransi jiwa berjangka unit link dengan garansi lebih besar dibandingkan dengan premi asuransi jiwa berjangka unit link tanpa garansi. Kata kunci:
Estimation of Value-at-Risk Adjusted under the Capital Asset Pricing Model Based on ARMAX-GARCH Approach
Authors: Sukono F , Lesmana Eman , Susanti Dwi , Napitupulu Herlina , Hidayat Yuyun
Published: July 2020

Investors having an understanding of investment statistics are important. Especially quantitative tools related to investment risk measurement. Value-at-Risk Adjusted is one of the investment risk measurement tools, which assumes that returns are not normally distributed.This paper intends to measure investment risk based onValue-at-Risk Adjustedor called Modified Value-at-Risk under the Capital Asset Pricing Model. It is assumed that the return of the market index has a non-constant average and there is a long memory effect. The average of the return of the market index is estimated using ARFIMA models.It is also assumed that the stock risk premium correlates with market risk premiums, and stock risk premiums some time before. The correlation will be analyzed using the ARMAX-GARCH model approach. The Modified Value-at-Risk was then formulated based on the Capital asset Pricing Model with the ARMAX-GARCH model approach.To measure the performance of Modified Value-at-Risk that has been formulated is done with back testing. Back testing is carried out based on the Lopez II method. As a case study, analyzed some data on 10 stocks traded on the capital market in Indonesia.The results of the analysis show that the market index return risk premium significantly follows the ARFIMA model, and the 10 share risk premium significantly follows the ARMAX-GARCH model. Based on the results of back testing calculations indicate that the Value-at-Risk Adjustedor Modified Value-at-Risk is very suitable to be used to measure investment risk in the 10 stocks analyzed.
Dihedral Group in The Ancient Genetic
Authors: Aisah Isah , Djauhari Eddy , Singgih Asep
Published: July 2020

The standard genetic code consist of four nucleotide bases which encode genes to produce amino acids needed by living things. The addition of new base  (Dummy) causes a sequence of bases to become five nucleotide bases called ancient genetic codes. The five base set is denoted by , where B forms group through matching , , , , and   from set . Ancient genetic codes can be reviewed as algebraic structures as a vector spaces and other structures as symmetry groups. In this article, discussed the properties of symmetry groups from ancient genetic codes that will produce dihedral groups. The study began by constructing an expanded nucleotide base isomorphism with . The presence of base  causes  to have a cardinality of 24, denoted as  with .  isomorphic with  which is denoted by . Group  had three clasess of partitions based on strong-weak, purin-pyrimidin types, and amino-keto nucleotide groups which are denoted as , , and . All three classes are subgroups of . By using the rules of rotation and reflection in the four-side plane, it was found that only one group fulfilled the rule was named the dihedral group. Keywords: ancient genetic code, group, subgroup, permutation, symmetry group , dihedral group.
Konstruksi Metode Transformasi Diferensial Multi-Step (Multi-Step Differential Transform Method) untuk Model SEIRS Autonomous dan Nonautonomous
Authors: Bunga Esther Y , Pahnael Jusrry R , Lobo Maria , Ndii Meksianis Z.
Published: July 2020

Pemodelan matematika telah banyak digunakan untuk memahami permasalahan nyata. Model matematika dapat diselesaikan secara analitik. Namun, apabila model matematika tersebut semakin kompleks, maka solusi analitik tidak mudah diperoleh dan pendekatan numerik digunakan. Dalam artikel ini, pendekatan numerik dengan Metode Transformasi Diferensial (MTD) \textit{multi-step} yang menghasilkan solusi deret konvergen digunakan untuk mencari solusi dari model matematika penyebaran penyakit SEIRS yang \textit{autonomous} dan \textit{non-autonomous}. Metode ini dikenal juga dengan metode semi analitik karena kita dapat menuliskan solusi analitik dari model yang dicarikan solusinya. Dalam artikel akan dikonstruksi metode tranformasi diferensial untuk model SEIRS \textit{autonomous} dan \textit{nonautonomous} dan menganalisis akurasi dengan cara membandingkan dengan metode Runge-Kutta. Metode transformasi diferensial \textit{multi-step} dapat memberikan aproksimasi solusi yang baik dari model matematika SEIRS \textit{autonomous} dan \textit{non-autonomous}. Namun, kinerja dari metode ini lebih baik pada model \textit{autonomous}.}}
Penanganan Kekerasan Seksual Terhadap Perempuan Dalam Situasi Bencana
Authors: - Anisa - , Santoso Meilanny Budiarti Budiarti
Published: July 2020

Kekerasan seksual terhadap perempuan dalam beberapa tahun terakhir mengalami peningkatan. Kekerasan tersebut dapat terjadi dimana saja, kapan saja dan kepada siapa saja. Beberapa kasus kekerasan seksual yang kurang mendapatkan perhatian adalah kekerasan seksual yang terjadi dalam situasi bencana. Korban dari kekerasan seksual tersebut sebenarnya dapat terjadi pada siapasaja, hanya dalam kontek ini yang dibahas adalah korban bencana yang menjadi korban kekerasan seksual. Dalam situasi pasca bencana biasanya seseorang memiliki tekanan yang lebih besar, sehingga memerlukan suatu pelampiasan emosi maupun seksual. Sedangkan korban dari kekerasan seksual tersebut biasanya akan merasakan ketidakadilan, kesengsaraan atau penderitaan secara fisik, seksual, psikologis kepada korban. Hal tersebut menyebabkan kecenderungan korban untuk menarik diri dari lingkungan sosialnya, yang kemudian membuat korban sulit untuk memenuhi kebutuhan pribadinya dan/atau menjalankan kembali keberfungsian sosialnya. Untuk itu pekerja sosial perlu menjalankan perannya sebagai advokator. Advokasi dilakukan sebagai upaya dari pemulihan dengan cara membantu klien agar mampu menjangkau sumber atau pelayanan sosial yang telah menjadi haknya. penelitian ini menggunakan metode deskriptif kualitatif yang bertujuan untuk menggambarkan dan meringkas berbagai kondisi, situasi, atau fenomena realistis sosial yang ada di masyarakat yang menjadi objek penelitian.dan bertujuan untuk mengetahui bagaimana peran pekerja sosial dalam memberikan advokasi kepada perempuan korban kekerasan seksual dalam situasi bencana, sesuai dengan nilai, prinsip serta kode etik pekerja sosial. Serta untuk mengetahui bagaimana dinamika advokasi yang dilakukan oleh pekerja sosial.
SIKAP MAHASISWA PERGURUAN TINGGI TERHADAP MITOS PERKOSAAN
Authors: Humaedi Sahadi , Rusyidi Binahayati , Bintari Antik
Published: July 2020

Kelompok usia dewasa muda, khususnya mahasiswa merupakan kelompok yang rentan menjadi korban dan pelaku tindak kekerasan seksual. Karenanya pemahaman mereka mengenai kekerasan seksual sangat penting untuk tindak pencegahan dan penanganan yang lebih tepat. Penelitian bertujuan menguji dampak intervensi kegiatan yang bertujuan meningkatkan pemahaman kritis mahasiswa mengenai mitos perkosaan (rape myths). Sampel adalah 67 orang mahasiswa yang sedang menempuh pendidikan pada sebuah universitas negeri di wilayah Sumedang. Intervensi diberikan dalam bentuk pelatihan dalam durasi 4 minggu berturut-turut ditujukan untuk meningkatkan pengetahuan dan kesadaran kritis mahasiswa mengenai kesetaraan jender, kekerasan seksual terhadap perempuan dan mitos-mitos perkosaan. Sikap terhadap mitos perkosaan diukur menggunakan skala Illinois Rape Myth Attitudes. Uji beda pre-post tests menggunakan t-tests menunjukkan bahwa intervensi berdampak positif terhadap perubahan sikap mahasiswa mengenai mitos perkosaan. Hal ini ditunjukkan dengan semakin meningkatnya secara signifikan penolakan mahasiswa terhadap berbagai pernyataan stereotipikal dan tidak berdasar mengenai perkosaan dibandingkan dengan sebelum intervensi (p<.001) Penelitian merekomendasikan pengembangan dan penyebarluasan pelatihan serupa untuk meningkatkan sensitivitas mahasiswa terhadap mitos perkosaan.
Perilaku Anak Peserta Program Jatinangor Mengaji
Authors: Santoso Meilanny Budiarti , Mailani Silvia Dwi Astuti , Nurlaeli Dede Rahmaida , Syalis Elprida Ryanny , Putri Bimby Gita Rama , Wibowo Hery , Santoso Meilanny Budiarti , Krisnani Hetty
Published: July 2020

Jatinangor Mengaji merupakan suatu aktivitas proses belajar mengajar yang dilakukan oleh sekumpulan mahasiswa DKM Fisip UNPAD kepada anak-anak yang berada di Masjid Assyukur Rahman, Jalan Sayang, Desa Cikeruh, Kecamatan Jatinangor. Dalam era teknologi atau revolusi industri 4.0, proses pemakaian sistem digital sudah nampak terjadi dan intensitasnya semakin meningkat, khususnya pada generasi muda. Kemudahan akses pada dunia gawai dan internet menjadi salah satu faktor perubahan perilaku belajar pada anak. Dalam proses belajar untuk menumbuhkembangkan sistem motivasi atau motif belajar pada anak di Jatinangor Mengaji dengan diberlakukannya penerapan perspektif behavioristik. Penelitian ini menggunakan pendekatan kualitatif dan studi deskriptif. Data penelitian dikumpulkan dengan metode observasi dan wawancara. Tujuan penelitian ini untuk mendeskripsikan penerapan teori behavioristik dalam meningkatkan motivasi belajar pada anak di Jatinangor Mengaji dalam era digitalisasi. Perilaku anak dalam kegiatan belajar mengaji ini yang menjadi titik fokus dalam tulisan ini.
POLA ASUH YANG BERBEDA-BEDA DAN DAMPAKNYA TERHADAP PERKEMBANGAN KEPRIBADIAN ANAK
Authors: Sonia Gina , Apsari Nurliana Cipta
Published: July 2020

ABSTRAKOrang tua memiliki tanggung jawab yang penuh terhadap kebutuhan seorang anak. Kebutuhan ini tidak hanya berupa materi melainkan non materi seperti fisik dan mental. Kebutuhan ini dapat diperoleh melalui pola asuh yang diterapkan oleh orang tua terhadap anak. Pola asuh dapat membantu anak untuk bertumbuh dan berkembang sesuai dengan tugas perkembangan dalam tahapan perkembangan. Pemilihan pola asuh sangatlah relatif, tergantung perspektif orang tua yang menginginkan pola asuh seperti apa yang akan digunakan. Namun pemilihan pola asuh harus dipertimbangkan bagaimana dampaknya terhadap perkembangan anak. Bukan hanya perkembangan fisik melainkan perkembangan kepribadian anak tersebut pula. Penjelasan mengenai pola asuh di peroleh berdasarkan konsep yang berkaitan dengan tema pola asuh dan dampaknya terhadap kepribadian anak. Hal ini untuk menjelaskan bagaimana dampak dari pola asuh yang berbeda-beda terhadap perkembangan kepribadian anak. ABSTRACTParents have a responsibility for the needs of a child. Not only material needs but also non maerial needs such as physical and mental. This need can be obtained through parenting applied by parents to children. Parenting can help children to grow and develop according to developmental tasks at the development stage. The choise of parenting is very relative, depending on the perspective of parents who want the parenting style to be used. But the parenting ust be considered how the impact on child development. Not only for physical development but also the development of the child’s personality. An explaination of parenting is obtained based on concept related to the theme of parenting and its impact on the child’s personality. This is to explain how the effects of different parenting styles on children’s personality development.
PEMETAAN PROFIL KONSTELASI POLITIK DESA CINTARATU, KABUPATEN PANGANDARAN, JAWA BARAT, INDONESIA
Authors: Al-Banjari Husin M. , CMS. Samson , Natari Sari Usih
Published: July 2020

Desa Cintaratu yang terletak di Kabupaten Pangandaran dikenal sebagai daerah yang baru dimekarkan sejak tahun 2013, di bawah kepemimpinan pasangan H. Jeje Wiriadinata – H. Adang Hadari. Hal ini disebabkan oleh fenomena power struggle di kalangan masyarakat Kabutapen Pangandaran. Suasana power struggle seperti itu tentu saja sedang menyelimuti pikiran sebagian masyarakat khususnya Desa Cintaratu, apalagi mengingat beberapa tokoh yang dulu terlibat aktif dalam presidium pemerakan berasal dari Desa Cintaratu. Sehubungan masyarakat Desa Cintaratu yang masih percaya kepada tradisi tutur Sunda yang disebut uga. Dimana  uga dapat diartikan sebagai “ramalan”. Tujuan dari penelitian ini memperoleh gambaran yang sistematis dan detail tentang rivalitas politik antara tokoh-tokoh presidium yang berada di luar kekuasaan versus tokoh-tokoh incumbent di Kabupaten Pangandaran yang terus berlanjut. Selain itu fenomena politik di Desa Cintaratu dikaitkan dengan fenomena sosial lain, khususnya menyangkut fenomena bsnis atau wirausaha masyarakat setempat. Metode penelitian ini menggunakan metode kualitatif. Dimana data primer diperoleh dengan melakukan pengamatan (observasi) dan wawancara kepada DPC Partai Politik daerah Pangandaran sebagai koalisi partai pendukung incumbent Jeje Wiriadinata versus contender Supratman dalam mengikuti Pemilihan Kepala Daerah (Pilkada) di Kabupaten Pangandaran untuk tahun 2020. Hasil yang diharapkan dari penelitian ini adalah model pembangunan daerah berbasis politik dan kewirausahaan yang dapat diterapkan di wilayah Desa Cintaratu.