bluuebunny/crossref_metadata_2025 huggingface dataset:
Teaching about the COVID-19 Pandemic. (c2022)
Authors:   ,   Lebanese American University, Nasr Dareen
Published: July 2022

The purpose of this research study was to investigate the perceptions and practices of elementary science teachers in Lebanon on teaching about COVID-19. The COVID-19 pandemic, with its links to science, politics, ethics and economics, can be classified as a socioscientific issue – an open-ended and controversial issue connected to science content. In the era of the COVID-19 pandemic, teaching about the current socioscientific issue has become prominent. An emerging field of research recommends that science teachers start educating students about COVID-19; however, it is not clear how teachers perceive teaching about it and what their teaching practices look like inside the science classroom. This study employed a survey design that drew upon a questionnaire and semi-structured interviews as data sources. The target population constituted 299 elementary science teachers. Participants were recruited using the snowball sampling technique. They completed a questionnaire comprising eighteen Likert-type questions. Next, follow-up, semi-structured interviews were conducted with a random sample of 20 participants. The questionnaire was analyzed quantitatively through the use of descriptive statistics. Pearson’s correlation coefficient (r) was calculated to examine the relationship between the two variables of the study: perceptions and practices. The transcribed interview responses were analyzed using qualitative thematic analysis and triangulated with the quantitative analysis from the questionnaires. The findings of this study revealed that elementary science teachers have a strong belief in the importance of teaching about COVID-19 and in its role for enhancing scientific literacy. The results showed that teaching about COVID-19 is not part of the current teaching practices for most science teachers. Although this study is limited to elementary science teachers in Lebanon, the findings raise new questions for future research. Recommendations are provided to science educators, policy-makers and curriculum designers.
α-ketoglutarate (αKG) acts as a protective factor against chronic stress and has antidepressant properties by modulating BDNF levels in the brain. (c2022)
Authors:   ,   Lebanese American University, Eid Fady
Published: July 2022

Major depression and anxiety are one of the most common mental disorders worldwide. Attempts to alleviate these mental burdens are usually through psycho-therapeutic approaches, but little focus has been placed on lifestyle modifications. Adoption of these modifications, such as physical exercise, improved dietary intake, and proper sleep, have served as a nexus between clinical treatments as well as general health promotion. A multitude of studies points to how physical exercise has positive outcomes on depression and anxiety via the induction of a neurotrophic factor known as brain-derived neurotrophic factor (BDNF). α-ketoglutarate (aKG) was recently identified as a factor that is released into the blood upon exercise. In this study, we investigated whether aKG has prophylactic and antidepressant effects in chronic social defeat stress and chronic variable stress models of depression, as well as unravel the underlying molecular mechanisms. Our work shows that aKG serves as a potential prophylactic treatment for depression in both males and females through the modulation of BDNF in specific brain regions. In males, aKG pretreatment promotes resilience to stress via the PGC1a-BDNF axis within the hippocampus. Moreover, aKG exhibited antidepressant effects in susceptible female mice by modulating BDNF levels. In the hippocampus, aKG increases BDNF levels possibly through the PGC1a-BDNF pathway. In the NAc, aKG decreases BDNF levels possibly through the FNDC5-BDNF pathway.
Konfigurasi Optimum pada Susunan Linear Antena MIMO Mikrostrip Polarisasi Sirkular
Authors: ASTUTI RINA PUDJI , YUNITA TRASMA , MEYLANI LINDA
Published: July 2022

ABSTRAKUntuk memastikan sistem antena MIMO memiliki kapasitas kanal yang diharapkan, maka rancangan antenanya harus memenuhi indikator kinerja optimum, yang ditentukan oleh karakteristik dari elemen penyusun dan konfigurasi susunan antena MIMO. Polarisasi antena merupakan aspek yang mempengaruhi mutual coupling antar elemen antena pada MIMO. Sebagai salah satu parameter penting, maka konfigurasi polarisasi elemen antena pada proses desain harus dikaji dengan baik. Pada paper ini sebagai kontribusi penelitian, dilakukan kajian secara mendalam mengenai susunan linear elemen mikrostrip dengan polarisasi sirkular untuk antena MIMO pada frekuensi sub-6 GHz. Hasil penelitian menunjukkan bahwa konfigurasi B dan C yang merupakan konfigurasi polarisasi silang yang memiliki rentang frekuensi 2,04 x dan 2,08 x lebih lebar dibandingkan konfigurasi A, yang memiliki rentang frekuensi terendah berdasarkan Envelope Cross Correlation (ECC), dan memiliki rentang frekuensi 3,9 x dan 3,87 x lebih lebar dibandingkan konfigurasi E yang memiliki rentang frekuensi terendah berdasarkan Diversity Gain (DG).Kata kunci: MIMO, antena, polarisasi sirkular, konfigurasi. ABSTRACTTo ensure MIMO antenna system has the expected channel capacity, antenna design needs to meet the requirement of MIMO antenna optimal performance indicators, that are determined by the characteristics of the constituent elements and the configuration of the MIMO antenna array. Antenna polarization is a feature that affects the mutual coupling between antenna elements in MIMO. Therefore, the configuration of antenna element polarization in the design process needs to be well studied. Our research contribution in this paper is an in-depth study of the linear arrangement of circularly polarized microstrip elements for MIMO antennas at sub-6 GHz frequencies. The simulation results show that B and C configuration as cross-polarizing configuration have 2,04 x and 2,08 x wider bandwidth than A configuration, that has narrowest bandwidth based on Envelope Cross Correlation (ECC), and have 3,9 x and 3,87 x wider bandwidth than E configuration, that having narrowest bandwidth based on Diversity Gain (DG).Keywords: MIMO, antenna, circular polarization, configuration.
Desain ADC SAR 10-Bit Dua Kanal Simultan menggunakan Board FPGA Altera DE10
Authors: NUHA MUHAMMAD ULIN , DHARMAWAN HARI ARIEF , SAKTI SETYAWAN PURNOMO
Published: July 2022

ABSTRAKDesain arsitektur ADC (Analog to Digital Converter) multi kanal simultan pada perangkat kontroller dapat mengurangi jumlah intruksi (task) program yang harus dijalankan oleh mikroprosessor dan dapat digunakan untuk membentuk pengukuran simultan. Paper ini memaparkan desain ADC SAR (Successive Approximation Register) 10-bit dua kanal simultan menggunakan Board FPGA (Field Programmable Gate Array) Altera DE10. FPGA dikonfigurasi untuk difungsikan sebagai sirkuit logika SAR dua kanal menggunakan bahasa VHDL (VHSIC-Very High Speed Integrated Circuit Hardware Description Language). Hasil pengujian menunjukkan kanal ADC_1 dan ADC_2 memiliki tingkat kesalahan rata-rata sebesar 1.05 % dan 0.90 %, tingkat akurasi sebesar 98.95 % dan 99.09 %, tingkat linearitas dengan koefisien korelasi sebesar 0.9999 dan 0.9999. Durasi waktu yang dibutuhkan dalam satu kali proses konversi ADC yaitu 104 μs. Didapatkan sampling-rate sebesar 9.6 KS/s. Daya yang dikonsumsi sebesar 842 mW. Kedua kanal ADC SAR yang telah dibuat mampu bekerja secara simultan.Kata kunci: ADC, dua-kanal simultan, FPGA, SAR, VHDL ABSTRACTDesing of simultaneous multi-channel ADC (Analog to Digital Converter) architecture on the controller device can reduce the number of program instructions (tasks) that must be executed by microprocessor and can be used to form simultaneous measurements. This paper describes design of simultaneous two channel 10-bit SAR (Successive Approximation Register) ADC by using Board FPGA (Field Programmable Gate Array) Altera DE10. FPGA is configured using VHDL (VHSIC-Very High Speed Integrated Circuit Hardware Description Language) language to function as two channels SAR logic circuit. Test results show that ADC_1 and ADC_2 channels have average error of 1.05% and 0.90%, accuracy of 98.95% and 99.09%, linearity level with correlation coefficient of 0.9999 and 0.9999. Time duration in one ADC conversion process is 104 μs. The sampling rate obtained is 9.6 KS/s. Power consumed is 842 mW. Design of two channels SAR ADC that has been made can work simultaneously.Keywords: ADC, two-channels simultaneous, FPGA, SAR, VHDL
Pengendalian Simulator Water Supply System menggunakan PID Berdasarkan Identifikasi
Authors: SARTIKA ERWANI MERRY , BR. PASARIBU NOVIE THERESIA , SARJONO RUDI , GUNAWAN REYNALDY FELICIUS , HALIM CHRISENDY
Published: July 2022

ABSTRAKWater supply system dari sumber ke pengguna merupakan layanan penting, sehingga perlu dirancang untuk menyediakan air dengan tingkat tekanan yang cukup. Pengendalian water supply system dipengaruhi oleh kombinasi pemasangan pompa secara paralel dan seri untuk menghasilkan performansi yang dibutuhkan. Plant simulator water supply system dirancang dalam beberapa jenis instalasi yaitu pompa tunggal, pompa seri, pompa paralel, dan keran sebagai gangguan. Selain pengaruh instalasi, pengendalian plant simulator menggunakan PID diperlukan untuk menghasilkan tekanan air yang diinginkan. Plant simulator untuk setiap instalasi dimodelkan menggunakan identifikasi sistem, sehingga proses pengendalian dapat dirancang secara simulasi sebelum diimplementasi. Hasil penelitian ini menunjukkan bahwa instalasi pompa paralel pada plant simulator water supply system memberikan rata-rata penurunan tekanan air terkecil bila diberi gangguan yaitu sebesar 16,92% untuk setiap dilakukan pembukaan keran.Kata kunci: water supply, pompa seri paralel, identifikasi, simulator, PID ABSTRACTWater supply system from source to user is an important service, so it needs to be designed to provide water with sufficient pressure level. The control of the water supply system is influenced by a combination of pump installation in parallel and series to produce the required performance. The plant simulator water supply system is designed in several types of installations, namely single pumps, series pumps, parallel pumps, and faucets as disturbances. In addition to the effect of installation, plant simulator control using PID is needed to produce the desired water pressure. The plant simulator for each installation is modeled using system identification, so that the control process can be designed in a simulation before being implemented. The results of this study indicate that the parallel pump installation on the plant simulator water supply system provides the smallest average drop in water pressure when disturbed, which is 16.92% for each tap opening.Keywords: water supply, parallel series pump, identification, simulator, PID
Pengaruh Link Relay Terhadap Kinerja Komunikasi Kooperatif Vehicle-to-Vehicle (V2V)
Authors: MUHARRAM ISNAN , ADRIMAN RAMZI , NASARUDDIN NASARUDDIN
Published: July 2022

ABSTRAKKebutuhan komunikasi bergerak saat ini sangat tinggi, Vehicular Ad-hoc Network (VANET) merupakan metode teknologi telekomunikasi untuk komunikasi bergerak pada kendaraan. Penelitian ini dilakukan untuk mendapatkan metode terbaik dari komunikasi bergerak pada kendaraan dengan mempertimbangkan pengaruh Kecepatan kendaraan dan fading terhadap kinerja jaringan. Metode yang digunakan pada paper ini menggunakan jaringan single-relay yang disimulasikan menggunakan software MATLAB. Parameter kinerjanya adalah Bit Error Rate (BER) dan throughput untuk jaringan sistem komunikasi kooperatif Vehicle to Vehicle (V2V) dengan kondisi link relay Line of Sight (LOS) dan Non Line of Sight (NLOS). Kemudian, modulasi 16-QAM, 32-QAM dan 64-QAM digunakan untuk menguji parameter tersebut. Hasil simulasi menunjukkan bahwa kinerja sistem komunikasi kooperatif V2V dengan modulasi 16-QAM lebih baik dibandingkan 32-QAM dan 64-QAM untuk kondisi LOS dan NLOS. Sehingga usulan penelitian ini dapat menjadi solusi untuk perkembangan sistem komunikasi kooperatif V2V.Kata kunci: VANET, V2V, Link relay, Bit Error Rate (BER), Throughput. ABSTRACTThe need for mobile communication is currently very high; vehicular Ad-hoc Network (VANET) is the telecommunications technology method for mobile communication in vehicles. This research was conducted to obtain the best mobile communication method in vehicles by considering the effect of vehicle speed and fading on network performance. The method used in this paper uses a single-relay network which is simulated using MATLAB software. The performance parameters are Bit Error Rate (BER) and Throughput for the Vehicle to Vehicle (V2V) cooperative communication system network with Line of Sight (LOS) and Non-Line of Sight (NLOS) link relay conditions. Then, 16-QAM, 32-QAM, and 64-QAM modulations were used to test these parameters. The simulation results show that the performance of the V2V cooperative communication system with 16-QAM modulation is better than 32-QAM and 64-QAM for LOS and NLOS conditions so that this research proposal can be a solution for the development of a V2V cooperative communication system.Keywords: VANET, V2V, link relay, Bit Error Rate (BER), Throughput.
Klasifikasi Grade Telur Ayam Negeri secara non- Invasive menggunakan Convolutional Neural Network
Authors: IBRAHIM NUR , SA’IDAH SOFIA , HIDAYAT BAMBANG , DARANA SJAFRIL
Published: July 2022

ABSTRAKTelur ayam negeri merupakan salah satu sumber protein yang banyak dikonsumsi masyarakat Indonesia. Untuk menjaga kualitas telur ayam negeri yang beredar di Indonesia, diperlukan sistem yang mampu mengidentifikasi grade telur ayam dan mudah digunakan oleh masyarakat. Penelitian sebelumnya telah mengembangkan sistem pengklasifikasian grade telur ayam negeri secara invasive dengan tingkat akurasi 80%, namun sistem ini membutuhkan sampel telur yang dipecahkan sehingga setiap sampel telur tersebut tidak dapat disimpan dalam waktu lama. Oleh karena itu, penelitian ini mengembangkan sistem klasifikasi grade telur ayam tanpa perlu memecahkan sampel telur ayam (non-invasive). Dengan menggunakan metode Convolutional Neural Network (CNN), sistem mampu mengidentifikasi grade telur ayam negeri pada tingkat akurasi 85,86% dengan arsitektur LeNet-5, optimizer Adam, learning rate 0,001, dan epoch 50.Kata kunci: telur ayam negeri, non-invasive, convolutional neural network, LeNet-5 ABSTRACTLocal Chicken egg are one of the sources of protein that is widely consumed by the people of Indonesia. To maintain the quality of local chicken egg in the market, a system that can identified chicken egg’s grade and easy to use is needed. Previous research has developed an invasive chicken egg’s grade classification system with 80% accuracy. However, the system required egg sample to be cracked so the egg sample can’t be stored for too long. This research develop a non-invasive chicken egg’s grade classification system, which doesn’t require egg sample to be cracked. By using Convolutional Neural Network (CNN), system can identified chicken egg’s grade at 85,86% accuracy with LeNet-5 architecture, Adam optimizer, learning rate 0,001, and epoch 50.Keywords: local chicken egg, non-invasive, convolutional neural network, LeNet-5
Automatic Door Lock with Hand Cleaning and Infra-Red Temperature Detection System
Authors: GALINA MIA , PRASETYO GHALIB EKO , SITOMPUL ERWIN , SUHARTOMO ANTONIUS
Published: July 2022

ABSTRAKKotak pembersih tangan otomatis merupakan perangkat yang dapat membantu proses pembersihan tangan lebih efisien dibandingkan dengan cuci tangan konvensional. Situasi pandemi Covid 19 membutuhkan perangkat yang dapat bekerja non-kontak untuk mengurangi penyebaran virus. Penelitian ini bertujuan mengembangkan sebuah kotak pembersih tangan otomatis yang dapat membaca suhu tubuh menggunakan sensor temperature MLX90614 dikombinasikan dengan kunci pintu solenoid, untuk menjaga seseorang yang ingin memasuki ruangan tertentu harus membersihkan tangan dan memiliki suhu di bawah batas. Saat memasuki ruangan, pengukuran suhu tubuh dilakukan dengan meletakkan tangan pengunjung di sisi kiri dan kanan kotak hand sanitizer otomatis yang dilengkapi sensor MLX90614. Sistem ini bekerja secara akurat dan dapat membaca suhu tubuh secara optimal dari 1 cm - 3 cm, dengan perbedaan dengan pengukuran thermometer guns hanya berkisar -0,27%~-1,92%. Selanjutnya sistem ADHC mampu meningkatkan efisiensi waktu sebesar 83,15% jika dibandingkan dengan metode konvensional. Kata kunci: pembersih tangan otomatis, pengecek suhu tubuh, Bluetooth, RFID ABSTRACTAn automatic hand cleaning box is a device that can help the hand cleaning process be more efficient than conventional hand washing. The Covid 19 pandemic situation requires a device with a contactless system to reduce the spread of the virus. This research aims to develop an automatic hand sanitizer box that can read body temperature using MLX90614 temperature sensor combined with a solenoid door lock to keep someone who enters the room clean their hands and have a temperature below the limit. When entering the room, body temperature measurement is done by placing the visitor's hand on the left and right sides of the automatic hand sanitizer box, equipped with sensor MLX90614. This system works accurately and can read body temperature optimally from 1 cm - 3 cm, with the difference between the thermometer guns only ranging from -0.27%~-1.92%. Furthermore, the ADHC system is able to increase time efficiency by 83,15% if compared with the conventional method.Keyword: automatic hand cleaning, body temperature check, Bluetooth, RFID.
Pengaruh Jenis Restraint pada Kekuatan Mekanik Support Untai FASSIP 03 NT
Authors: HARYANTO DEDY , GIARNO GIARNO , KUSNUGROHO GREGORIUS BAMBANG HERU , ROSIDI AINUR , PAMUNGKAS ADHIKA ENGGAR , JUARSA MULYA
Published: July 2022

ABSTRAKKegiatan penelitian yang dilakukan dilatarbelakangi oleh kejadian kecelakaan pada PLTN Fukushima Dai-Ichi Jepang. Untai Fasilitas Simulasi Sistem Pasif-03 Nanobubbles Transparent (FASSIP 03 NT) menggunakan fluida Nanobubbles sebagai fluida kerja. Support untai FASSIP 03 NT merupakan salah satu komponen di untai FASSIP-03 NT, berfungsi sebagai penopang seluruh komponen untai FASSIP 03 NT sehingga perlu diketahui kekuatan mekaniknya meliputi tegangan mekanik dan translational displacementnya. Metode pengujian dilakukan secara simulasi menggunakan software CATIA yang merekomendasikan penggunaan restraint jenis slider pada keempat kaki support untai FASSIP 03 NT. Dengan adanya penelitian sistem pasif ini maka kondisi ketiadaan catu daya listrik bagi pompa pendingin teras reaktor PLTN tidak berakibat fatal, karena sistem pendingin pasif dapat mengambil alih fungsi pendinginan pada teras reaktor.Kata kunci: FASSIP 03 NT, tegangan mekanik, translasional displacement, restraint, clamp, slider  ABSTRACTThe research activity was carried out against the background of an accident at the Fukushima Dai-Ichi Nuclear Power Plant in Japan. Passive System Simulation Facility Strand-03 Nanobubbles Transparent (FASSIP 03 NT) uses Nanobubbles fluid as the working fluid. The FASSIP 03 NT strand support is one of the components in the FASSIP-03 NT strand, it functions as a support for all FASSIP 03 NT strand components so it is necessary to know its mechanical strength including mechanical stress and translational displacement. Methodology has been done through simulation testing using CATIA software, it is recommended to use a slider type restraint on the four legs of the FASSIP 03 NT strand support. With this passive system research, the condition of the absence of an electric power supply for the nuclear power plant reactor core cooling pump is not fatal, because the passive cooling system can take over the cooling function in the reactor core.Keywords: FASSIP 03 NT, mechanical stress, translational displacement, restraint, clamp, slider
Prototipe Mesin Penjual Air Mineral Otomatis berbasis Arduino Mega 2560 dan RFID-RC522
Authors: SIMATUPANG JONI WELMAN , PRASETYO BAYU , GALINA MIA , SUHARTOMO ANTONIUS
Published: July 2022

ABSTRAKMeningkatnya jumlah sampah botol plastik sekarang ini telah membawa banyak masalah kesehatan dan lingkungan hidup. Masalah tersebut dapat dikurangi jika seseorang mau membawa botol minum (tumbler) sendiri. Namun, dibutuhkan mesin penjual air mineral untuk mengisi ulang tumbler. Paper ini menjelaskan disain dan implementasi prototipe mesin penjual air mineral otomatis, praktis, dan ekonomis berbasis Arduino Mega 2560 dan RFID-RC522. Pengujian terhadap prototipe ini dilakukan dalam tiga tahap: (1) pengujian jarak baca antara kartu RFID dengan RFID reader, (2) pengujian pada kondisi ideal, dan (3) pengujian pada kondisi tidak ideal. Dari pengujian pertama disimpulkan bahwa RFID-RC522 dapat melakukan pembacaan optimal pada jarak 35 mm. Dari hasil pengujian kedua diperoleh nilai akurasi (keakuratan) pada saat pengisian air sebesar 82%. Sedangkan hasil pengujian ketiga menyatakan bahwa prototipe dapat membaca kemungkinan yang terjadi pada kondisi tidak ideal. Kelemahan dari prototipe ini adalah belum terintegrasi dengan sistem pembayaran uang elektronik (e-money).Kata kunci: Arduino Mega 2560, Mikrokontroller, RFID-RC522, Sampah Plastik. ABSTRACTThe increasing amount of plastic bottle waste today has brought many health and environmental problems. These problem can be minimized when someone brings their own drinking bottle water. But, vending machine-like was needed to refill the tumbler. This paper explains a design implementation of prototype that can provide an automatic, practical, and economical mineral water filling based on Arduino Mega 2560 and RFID-RC522. Testing on this prototype was carried out in three stages: (1) testing of the reading distance between the RFID card and the RFID reader, (2) testing under ideal conditions, and (3) testing under non-ideal conditions. From the first test summarized that the RFID-RC522 can perform optimal readings at a distance of 35 mm. From the second test obtained the accuracy of the prototype when filling water by 82%. And the third test shows that the prototype could read the possibilities occurred in non-ideal conditions. The drawback of this prototype is not yet integrated with e-money payment system.Keywords: Arduino Mega 2560, Microcontroller, RFID-RC522, Plastic Waste.
Perangkat Budidaya Microgreen berbasis Internet of Things
Authors: AFANDI MAS ALY , FADHLAN FATHURROZAQ , ROCHMANTO RADITYA ARTHA , WIDYANTARA HELMY
Published: July 2022

ABSTRAKMicrogreen merupakan sayuran muda yang lebih kaya akan gizi jika dibandingkan dengan sayuran dewasa. Sayuran ini dibudidayakan dengan waktu yang cepat sekitar 10 – 14 hari setelah proses pembibitan. Masa yang cepat ini menuntut pemeliharaan yang baik. Kebutuhan ini mendorong penelitian tentang perangkat budidaya microgreen yang mampu mengontrol kelembapan dan intensitas cahaya. Penelitian ini bertujuan untuk membuat media sarana perangkat budidaya microgreen berbasis Internet of Things. Perangkat ini memberikan hasil yang baik dengan nilai akurasi pada pembacaan kelembapan 15% 30%, 60%, 80%, dan 90% masing-masing sebesar 93,47%, 96,29%, 98,83%, 97,08%, dan 99,05%. Sedangkan akurasi pada pembacaan intensitas cahaya pada jarak 10 cm dan 15 cm masing-masing sebesar 99,98% dan 99,85%. Waktu tunda yang dibutuhkan untuk mengirim ke IoT platform adalah 0,5 – 2 s. Perangkat ini mampu membaca parameter dengan baik dan dikirimkan ke cloud Antares.Kata kunci: microgreen, sayuran, Internet of Things, akurasi, kelembapan media ABSTRACTMicrogreens are young vegetables but more nutritious compared to mature vegetables. Microgreens are cultivated with a fast time period around 10-14 days after the seeding process. This fast period requires good maintenance by keeping the media moist and light requirements on microgreens. This need encourages research on microgreen cultivation devices that are able to control humidity and light intensity. This study aims to create a microgreen cultivation device based on the Internet of Things. This device gives good results with accuracy values at 15%, 30%, 60%, 80%, dan 90% humidity readings of 93,47%, 96,29%, 98,83% 97,08%, and 99,05% respectively. Meanwhile, the accuracy in light intensity reading at a distance of 10 cm and 15 cm is 99,98% and 99,85%, respectively. The delay time required to send to the IoT platform is 0,5 – 2 s. This device is can read all parameter and send it to Antares IoT platform.Keywords: microgreen, vegetable, Internet of Things, accuracy, soil moisture
Sistem Pendinginan Panel Surya dengan Metode Penyemprotan Air dan Pengontrolan Suhu Air menggunakan Peltier
Authors: LAKSANA EKA PURWA , SANJAYA OKTIVIYANTO , SUJONO SUJONO , BROTO SUWASTI , FATH NIFTY
Published: July 2022

ABSTRAKSalah satu faktor yang dapat mempengaruhi efisiensi panel surya adalah suhu pada modul panel surya. Efisiensi panel surya akan menurun seiring dengan naiknya suhu panel surya. Oleh karena itu, dibutuhkan suatu mekanisme pendinginan pada sistem panel surya untuk dapat meningkatkan efisiensi panel surya. Pada penelitian ini, dirancang sebuah sistem pendinginan panel surya dengan metode penyemprotan air dan pengontrolan suhu air. Jika suhu telah mencapai 40oC, pompa yang terdapat pada bak penampungan air akan bekerja mengalirkan air ke permukaan panel surya. Dengan demikian, suhu pada panel surya dapat dikontrol agar sesuai dengan set point yang diinginkan yakni di bawah 40oC. Sistem pengontrolan suhu air dengan peltier dan fan dilakukan untuk mengontrol suhu air di dalam bak penampungan air agar tetap berada pada suhu maksimal 39oC. Sistem pendinginan panel surya pada penelitian ini mampu meningkatkan daya keluaran panel surya sebesar 30,19%.Kata kunci: panel surya, pendingin, semprotan air, peltier ABSTRACTThe solar panels efficiency can be affected by the the temperature of the solar panel module. It will decrease as the temperature of the solar panels increases. Therefore, a cooling mechanism in the solar panel system is needed to increase the efficiency of the solar panels. In this study, a solar panel cooling system was designed with the method of spraying water and controlling water temperature. If the temperature has reached 40oC, the pump in the water reservoir will work to circulate water to the surface of the solar panel. Thus, the temperature on the solar panel can be controlled to match the desired set point, which is below 40oC. The water temperature control system with peltier and fan is carried out to control the temperature of the water in the water reservoir so that it remains at the maximum temperature of 39oC. The solar panel cooling system in this study was able to increase the solar panel output power by 30.19% when using the cooling system.Keywords: solar panels, cooling, water spray, peltier
Estimasi Utilisasi Prosesor pada Jaringan Interkoneksi Optik menggunakan Regresi Gaussian
Authors: NUHA HILAL HUDAN , WARDANA AULIA ARIF
Published: July 2022

ABSTRAKTeknologi prosesor paralel melibatkan lebih dari satu node prosesor dalam interkoneksi optik. Unjuk kerja dari desain dari jaringan optik tersebut harus diestimasi sebelum diimplementasikan. Atribut yang bisa diambil diambil dari desain tersebut yaitu nomor node dan thread, distribusi spasial dan temporal, dan rasio T/R. Kajian ini mengevaluasi teknik estimasi utilitasi prosesor menggunakan regresi Gaussian yang dibandingkan dengan Support Vector Machine untuk regresi dan regresi linear. Hasil percobaan penunjukkan bahwa regresi Gaussian menghasilkan akurasi estimasi paling tinggi dengan nilai koefisien determinasi sebesar 98.75%.Kata kunci: Utilisasi prosesor, interkoneksi optik, regresi Gaussian ABSTRACTParallel processor technology involves more than one processor node in an optical interconnection. The performance of the design of the optical network must be estimated before further deployment. The attributes that can be obtained from the design are the number of nodes and threads, the spatial and temporal distribution, and the T/R ratio. This study evaluates the processor utility estimation technique using Gaussian regression compared to the Support Vector Machine for linear regression and regression. The experimental results show that Gaussian regression produces the highest estimation accuracy with a coefficient of determination of 98.75%.Keywords: Processor Utilization, Optical Interconnection, Gaussian Regression
Sistem Pembangkit Laju-Aliran-Rendah Fluida Cair Presisi Tinggi menggunakan Kendali PID
Authors: SUTANTO HERI , HAQQI MUHAMMAD SABILA , SUBIANTORO ARIES , KUSUMOPUTRO BENYAMIN
Published: July 2022

ABSTRAKPeralatan infus medis seperti syringe pump dan infusion pump semakin banyak digunakan di rumah sakit dan fasilitas-fasilitas kesehatan. Kalibrasi peralatan tersebut sangat krusial dilakukan untuk mengidentifikasi penyimpangan pengukuran dan menghindari kerugian klinis hingga mortalitas. Peralatan tersebut umumnya dikalibrasi dengan metode perbandingan terhadap Infusion Device Analyzer (IDA). Untuk memastikan ketertelusuran kalibrasi tersebut, IDA perlu dikalibrasi, salah satunya dengan metode gravimetrik. Namun, kendala terbesar dalam kalibrasi IDA adalah membangkitkan laju aliran rendah dengan keberulangan yang baik dan kepresisian tinggi. Pada penelitian ini telah dibangun sebuah sistem pembangkit laju aliran rendah fluida cair presisi tinggi menggunakan kendali PID lingkar tertutup dengan kecepatan motor DC sebagai feedback. Hasil pengujian menunjukkan bahwa sistem dapat membangkitkan laju aliran pada rentang ukur 100 ml/jam kemudian turun ke 10 ml/jam. Ketidakpastian pengukuran yang diperoleh antara 0,06% pembacaan sampai 0,24% pembacaan, pada tingkat kepercayaan 95% dengan faktor cakupan k=2. Sistem yang dikembangkan layak digunakan dalam kalibrasi IDA.Kata Kunci: kalibrasi, peralatan infus medis, laju aliran rendah, kendali PID, ketidakpastian pengukuran ABSTRACTMedical infusion such as syringe pump and infusion pump are widely used in hospitals and health facilities. Calibration of the equipments are crucial in order to identify any measurement errors and to avoid clinical losses which may lead to mortality. The equipments are generally calibrated by an Infusion Device Analyzer (IDA). To ensure the traceability of the calibration results, IDA needs to be calibrated, one of which is by the gravimetric methods. However, the biggest problem in the calibration of IDA is generating low flow rates with good repeatability and high precision. In this research, the high-precision liquid low flow rate generator system has been built using a closed-loop PID control with DC motor speed as feedback. The results showed that the system was able to generate low flow rates at 100 ml/h then down to 10 ml/h. The uncertainty of calibrations range were from 0.06% to 0.24% of reading, at 95% confidence level with a coverage factor k=2. Hence, the system is suitable to be used in IDA calibration.Keywords: calibration, medical infusion, low flow rate, PID control, measurement uncertainty
Optimasi Convolutional Neural Network dan K-Fold Cross Validation pada Sistem Klasifikasi Glaukoma
Authors: FUADAH YUNENDAH NUR , UBAIDULLAH IBNU DAWAN , IBRAHIM NUR , TALININGSING FAUZI FRAHMA , SY NIDAAN KHOFIYA , PRAMUDITHO MUHAMMAD ADNAN
Published: July 2022

ABSTRAKPada penelitian ini dilakukan perancangan arsitektur Convolutional Neural Network (CNN) yang terdiri dari 5 layer konvolusi dan 1-fully connected layer untuk mengklasifikasikan citra fundus kedalam kondisi normal, early, moderate, deep, dan ocular hypertension (OHT). Selanjutnya, model yang diusulkan dibandingkan dengan arsitektur AlexNet yang memiliki 5 layer konvolusi dan 3- fully connected layer. Data yang digunakan berupa citra fundus yang terdiri dari 3200 data latih, 800 data validasi, dan 1000 data uji. Optimasi model CNN dilakukan dengan melakukan pengujian hyperparameter yang terdiri dari learning rate, batch-size, epoch, dan optimizer. Selain itu, pada tahap training diimplementasikan 5-fold cross validation untuk seleksi model terbaik. Dengan model yang lebih sederhana dari AlexNet, model CNN usulan dapat memberikan performansi yang sama dengan arsitektur AlexNet yaitu akurasi 100%, presisi, recall, f1-score dan AUC score bernilai 1.Kata kunci: glaukoma, citra fundus, convolutional neural network (CNN), AlexNet ABSTRACTThis study proposes a Convolutional Neural Network with 5 convolutional layer and 1-fully connected layer to classify fundus images into normal, early, moderate, deep, and ocular hypertension (OHT) conditions. Furthermore, the proposed model is compared with the AlexNet architecture which has 5 convolution layers and 3- fully connected layers. The data used is a fundus image consisting of 3200 training data, 800 validation data, and 1000 test data. The optimization of the CNN model is performed by testing the hyperparameters consisting of learning rate, batch size, epoch, and optimizer. In addition, at the training stage, 5-fold cross validation is implemented to select the best model to be used in the test stage. With a simpler model from AlexNet, the proposed model provides 100% accuracy performance with precision values, recall, f1-score, and AUC score of 1.Keywords: glaucoma, fundus images, convolutional neural network (CNN), AlexNet
IoT Implementation for Development of Remote Laboratory (Case Study on Microscope Practice)
Authors: Kustija Jaja , Jayanto Novall Dwi
Published: July 2022

During the pandemic situation, laboratories with a limited number of equipment cannot be used to their full capacity to avoid over crowded. Thus, innovation is needed in the design and arrangement of laboratories so that they can be accessed remotely with flexible schedule. However, when the community service team studied cases of teaching and learning practices during the pandemic, problems were found, among others, the imbalance between the number of tools and users, as well as limited practical opportunities in online-based learning. Therefore, in this community service a remote laboratory which could be accessed from where the users were as long as they connected to the internet was designed to provide solution to the problems. The designed remote laboratory utilized the Internet of Things (IoT) to help students do practicum on the topic Microspcope by using a remote desktop employing TeamViewer technique as a tool to access the lab computers with the usersâ€™ device. As expected, it is proven that remote laboratory can be used to overcome the imbalance between the number of laboratory equipment and laboratory users, and to avoid dangerous crowds during the pandemic as it can be accessed from where the users are located as long as they are connected to the internet.
Assisting the Installation of Wireless Network Devices at Bina Tani Mulya Al-Muhajidin Boarding School
Authors: Hanafi Usman , Sutrisno Sutrisno , Utomo TB , Vitrasia Vitrasia , Sulaiman Enceng , Nugroho Hertog
Published: July 2022

The rapid development of Information and Communication Technology (ICT) can be utilized to improve the quality of services in the world of education. Bina Tani Mulya Al Mujahidin Foundation Boarding School Junior High School (YBTMA) previously did not have ICT infrastructure, especially hotspot or access point services. Based on this, it was necessary to provide assistance to design the installation of Microtik hotspot and access point devices, as well as human resource training to use and maintain these devices so that they could be utilized as much as possible. The installation of hotspot devices and access points was carried out on November 9, 2019, while the training was carried out on November 16-17 2019. This program received positive responses from the program recipients. Our strategy of deploying internet access supporting tools, which was then followed by a briefing of theory and practice, was well received.
Generalized Tonic-Clonic Seizures after Self-Limited Epilepsy with Centrotemporal Spikes: A Case Series
Authors: Kim Hye Jin , Ko Young Joon , Kim Soo Yeon , Cho Anna , Kim Hunmin , Lim Byung Chan , Hwang Hee , Chae Jong-Hee , Choi Jieun , Kim Ki Joong
Published: July 2022

Purpose: Patients with self-limited epilepsy with centrotemporal spikes (SLECTS) rarely experience generalized tonic-clonic seizures (GTCS) after remission, and post-remission GTCS has not been thoroughly described in earlier studies. Herein, we describe the clinical and electrographic features of GTCS after a substantial period of seizure freedom in patients with SLECTS.Methods: This study included six patients (three boys and three girls) diagnosed with SLECTS who later developed GTCS after or near remission. Medical records, including clinical data and serial electroencephalography (EEG) recordings, were retrospectively reviewed for all patients.Results: Patients’ age at SLECTS onset ranged from 5.2 to 10.2 years (mean, 8.4 years), while seizure cessation was achieved between 8 and 12.2 years. During SLECTS, typical centrotemporal spikes were observed in all patients, and generalized spike-and-wave discharges were observed in three patients. The age at the first episode of subsequent GTCS ranged from 14.4 to 17.3 years (mean, 15.8 years), constituting an average interval of 5.6 years after the last episode of seizures (range, 4.1 to 8.1 years). EEG at subsequent episodes of GTCS revealed generalized discharges in two patients, focal discharges in two other patients, and normal discharges in the remaining two patients. Two patients had multiple episodes of GTCS.Conclusion: Although rare, GTCS may occur near or after remission in patients with SLECTS, and clinicians should be aware of this. Subsequent GTCS may be a manifestation of idiopathic generalized epilepsy. However, large-scale studies are needed to determine the nature of such episodes of GTCS and their associated risk factors.
Armor Layer Uniformity and Thickness in Stationary Conditions with Steady Uniform Flow
Authors: Ikhsan Cahyono , Permana Ariva S. , Negara Arlendenovega S.
Published: July 2022

The continuous movement of riverbed particles due to turbulent flow determines the stability of non-cohesive riverbeds and banks during riverbed and bank erosion and sedimentation. This study emulated the stable channel design by deriving the low maintenance cost of the channel through bed protection by an armor layer. The study investigated the effects of shear stress and grain size uniformity to determine the minimum non-cohesive armor layer thickness for the stability of riverbeds under steady uniform flow conditions. Experiments were conducted with four different discharges, five armor material gradations, and five bed-slope variations in a full-scale flume. We observed and recorded the behaviors of the five gradations of armor materials for given discharges and bed slopes. Eighty data points were recorded and analyzed. The hydraulic analysis of the flow along with the soil mechanics analysis of the armor materials was done. The soil mechanic analysis was particularly focused on the uniformity coefficient of the armor layer, Cu, to derive the armor layer equation. However, for the manageability of the study, we set the limit of the Cu between 3.0 and 6.0. From the viewpoint of non-erodibility, a wider Cu value indicated a thinner armor layer. Variables that govern the armor layer thickness and the layer thickness itself were derived and proposed. The variables, namely Cu, shear stress (t0 and tc), and mean diameter of the bed load and armor materials (Db50 and Da50). Our results show that these variables governed the thickness of the armor layer, and this is expected to contribute to the design of stable natural channels, which can minimize the cost of irrigation canal maintenance and development. Doi: 10.28991/CEJ-2022-08-06-01 Full Text: PDF
Asphalt Elasticity Modulus Comparison Using Modified Laboratory LWD Against UMMATA Method
Authors: Caroles Lucky
Published: July 2022

Highway consultants need pavement structure strength to examine and design. With advances in computer, sensor, and microelectronic technologies, the light weight deflectometer (LWD) can measure granular and asphalt layers. This portable, easy-to-use tool is suggested. This article was designed to improve LWD Pusjatan's accuracy and distinguish it from other testing methods. This study compares the LWD Pusjatan and UMMATA (Universal Material Testing Apparatus) methods for measuring modulus of elasticity on different materials. Boussinesq elastic theory is used to compute the modulus of most LWDs. In a semi-elastic environment, modulus is the connection between pressure and displacement in a rigid or flexible basis. The deflection value is derived from the process of vibrations caused by a load delivered from a given height onto a test item, with the wave/vibration collected by an acceleration measuring instrument, such as a geophone or accelerometer. The modulus of elasticity provided by the AUDL (Laboratory Deflection Test Equipment) method is less than that produced by the UMMATA method. According to the test results, the average value of AC Base material is 7.52% less than that of AC Base. The average value of AC BC material is just over 0.3%. These results indicate that more testing is necessary when using the AUDL methodology to detect correlations that might serve as a basis for comparison. Thus, the AUDL test method may be used as a nondestructive testing technique. This kind of non-destructive technique should be used frequently so that simulations of field circumstances are more accurate. Doi: 10.28991/CEJ-2022-08-06-012 Full Text: PDF
Predicting the Inelastic Response of Base Isolated Structures Utilizing Regression Analysis and Artificial Neural Network
Authors: Al-Rawashdeh Mohammad , Yousef Isam , Al-Nawaiseh Mohammad
Published: July 2022

Indeed, utilizing a base isolation system in RC structures can remarkably minimize the possibility of failure, particularly in seismic-prone countries. Despite that, the design of these structures is a long procedure that consists of choosing the appropriate isolator to optimize the nonlinear behavior of the superstructure. Moreover, the numerical simulations require huge computational effort when high accuracy is required. In recent decades, scientists and engineers have applied numerous estimation approaches such as multiple linear regression and artificial neural networks to decrease the required cost and time for daily design problems. Thus, this study's main objective is to solve the difficulty of rapid response prediction by using soft-computing techniques. Additionally, it aims to study the capability of multiple linear regression and artificial neural networks in estimating the seismic performance of base-isolated RC structures under earthquakes. A nonlinear response history analysis of four different lead rubber-bearing isolated RC structures will be performed in order to determine the responses of these structures. Subsequently, the prediction models will be developed using the responses of the structures as inputs for multiple linear regression and artificial neural networks. Lastly, the reliability of both estimation approaches in terms of the response of base-isolated structures will be investigated by comparing the prediction models' capability. In general, the results of the study show that artificial neural networks provide considerably better accuracy in estimating base-isolated structures compared to multiple linear regression, and their performance results in reliable prediction. Doi: 10.28991/CEJ-2022-08-06-07 Full Text: PDF
An Optimal Cost Estimation Practices of Fuzzy AHP for Building Construction Projects in Libya
Authors: Alfaggi Walid , Naimi Sepanta
Published: July 2022

This paper analysis and reviews the construction projects in Libya. In Libya, construction projects often face challenges due to the lack of proper information and data in cost-estimation methods. The primary goal of this paper is to demonstrate the estimation of construction costs using various methods. An optimization strategy based on a well-known robust algorithm The Fuzzy AHP technique is used to estimate the best roof structure choice based on cost rank among one or two-way flat slab, post-tension slab, pre-tension slab, waffle slab, and hollow core slab. The roofs were created employing five main factors that were implemented in a real-world situation in the Libyan building industry. The cost of materials, labor, machinery, transportation, and trash on site were all considered. Research findings show that the models can assist decision-makers in determining the cost rank of roof selection. When a range of methods are applied and compared to guarantee that this is the best option. This research study must be taken seriously when estimating and managing the contract and length of highway construction projects in the early stages of project development so that the time difference at the end of the project can be kept to a minimum by decision-makers when choosing the roof with the lowest cost. Doi: 10.28991/CEJ-2022-08-06-08 Full Text: PDF
SOME ASPECTS OF THE MECHANISM OF CUSTOMS AND TARIFF REGULATION UNDER MODERN CONDITIONS IN THE RUSSIAN FEDERATION AND IN THE WORLD
Authors: Belyaev Andrew
Published: July 2022

Methodology. The instrumental and methodological equipment of the work includes methods of economic analysis, statistical methods, selective observation, groupings, generalizations, expert assessments, etc. The purpose of the article is to analyze the administrative and legal aspects of the mechanism of customs and tariff regulation in modern conditions in the Russian Federation and in the world. The result of the study is a comprehensive review of the system of administrative and legal regulation of the customs tariff mechanism in the Russian Federation and in the world, within which: the impact of the customs tariff mechanism on foreign economic activity is assessed; modern bases and principles of tariff privileges and policy of protectionism are covered; the analysis of the administrative legislation of the studied territory was carried out; Weaknesses and problems of the administrative and legal support of the customs tariff mechanism were identified and ways to solve them were proposed. The state, as a subject that creates general conditions for management, has a powerful tool for customs regulation to stimulate the innovative state to increase GDP more than is possible only on the basis of national reproduction, transfers the country's economy to a new development trajectory.
DIGITAL COMPETENCIES OF A MODERN MANAGER: ANALYSIS OF NEEDS AND DIRECTIONS OF DEVELOPMENT
Authors: Krotenko Tatiana , Ermilina Diana , Simonov Sergei
Published: July 2022

To date, digitalization is an inevitable companion of social development, which causes the emergence of various tools for its implementation. The process of diffusion of this phenomenon into all spheres of life, including management, is dynamic. Due to the increasing need of management in the use of digital tools, the question of the formation of modern managers' competencies corresponding to changing conditions is extremely acute. The process of digitalization of the economy is a challenge for education, and universities, according to the authors of the article, should respond to it by forming new competencies not only for information and communication technology specialists, but also for future managers. This process should be carried out in cooperation between universities – represented by teachers, scientists and students, industry and markets - represented by experts from among managers. Students of management specialties need to master both information retrieval and system-algorithmic thinking, and even imagine the possibilities of specific programming languages. The hypothesis of the study, which consists in the fact that managers of the future are quite definitely aware of the need to master competencies in the field of information technology, is confirmed by the results obtained, which are detailed and visualized. Moreover, the study showed that some respondents already have specific knowledge in this area and their own experience in using complex information and communication tools. The "digital" knowledge, skills and abilities identified in the course of working with experts and students, which are necessary for managers of the future in addition to typical managerial ones, are summarized in the form of competencies.