Jurnal Litek : Jurnal Listrik Telekomunikasi Elektronika最新文献

{"title":"Different Techniques of Multiple Power Point Tracking for Photovoltaic Systems","authors":"M. Maimun, S. Subhan","doi":"10.30811/litek.v19i1.2887","DOIUrl":"https://doi.org/10.30811/litek.v19i1.2887","url":null,"abstract":"Understanding in such way the maximum available power generated by the photovoltaic (PV) array varies with the weather is critical for improving system efficiency by encouraging the PV system to operate at that maximum power point (MPP). Therefore, to maintain optimum power functioning at all irradiance levels and temperatures, a Maximum Power Point Tracking (MPPT) system is necessary. MPPT methods have been developed and implemented in a number of studies. The accuracy, convergence speed, ease of hardware implementation, PV dependency, number of necessary sensors, which are significantly differ across these systems. The first technique to be introduced was a single MPPT technique. However, as it works independently, it was unable to achieve several of the required characteristics. Afterwards, the merger techniques of multiple MPPTs and the combination of both (single and multiple MPPTs’ techniques) due to integrate the benefits of each algorithm while removing their limitations. Comparing and surveying MPPT algorithms in general took a significant amount of time. Despite this, there is a limited literature examining the combination techniques towards the multiple MPPT techniques and the single one. This paper presents the work and uses MATLAB/Simulink platform to simulate it. It is based on a study that contrasts single MPPT techniques with different combinations, namely the constant voltage (CV) method, the perturb and observe (PO) method and the combination of both (CV+PO), in order to validate MPPT's better performance.","PeriodicalId":309293,"journal":{"name":"Jurnal Litek : Jurnal Listrik Telekomunikasi Elektronika","volume":"374 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124679094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"IoT-based Communication Techniques of PVs Random Settlement in Residential Feeder","authors":"R. Rachmawati","doi":"10.30811/litek.v19i1.2846","DOIUrl":"https://doi.org/10.30811/litek.v19i1.2846","url":null,"abstract":"Whenever the additional random 1-5 kW rating and location photovoltaics (PVs) are connected into the residential feeder, the voltage profiles of the feeder become unbalanced. Besides the various load at the customer side has already imbalanced the feeder, the installed single-phase rooftop PVs do the same thing. They caused the power quality issues, namely voltage magnitude and angle, frequency, active and reactive powers become expressively recognized. Since the ancient electric utility infrastructure from power plants to customer side is now disrupting by the added settlement of several utility devices, the power quality issues have raisin significantly. This paper aims to implement the concept of several internets of things (IoT) technologies into the electric and communication infrastructures as they are able to virtuously cycle, enable, amplify and reinforce the utility development. To improve the imbalanced voltage and other power quality issues, this concept applied to the existed voltage regulation technique (VRT). The results show that the concept of IoT-based communication is successfully implemented if both the devices and technologies properly selected and designed. Additionally, the classification of communication layers, then the coordination of sensors, actuators, and meters along the residential feeder need to be considered as well.","PeriodicalId":309293,"journal":{"name":"Jurnal Litek : Jurnal Listrik Telekomunikasi Elektronika","volume":"839 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126967341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stand-Alone Solar PV System using MPPT Technique in Simscape","authors":"M. Maimun","doi":"10.30811/LITEK.V18I2.2320","DOIUrl":"https://doi.org/10.30811/LITEK.V18I2.2320","url":null,"abstract":"the stand-alone solar photovoltaic (PV) system mostly used by the islanded power electricity needed for rural area that located far away and unreachable from the national grid. Due to operate the system, the multiple power point tracker (MPPT) technique is used to support PV system to operate at its maximum power. The way the MPPT algorithm works is by calculating the output of PV module, then compares it to battery voltage then fixes what is the optimum power that PV module can produce to charge the battery and converts it to the optimum voltage to get maximum current into battery. It can also supply power to a DC load, which is connected directly to the battery. MPPT is very useful in cloudy days. This paper deploys the use of MPPT technique within the stand-alone solar PV system by simulating the designed Simscape model. Two MPPT techniques, which are the incremental conductance and perturbation and observation (PO) have been chosen to be run as the system simulated. The parameters that have been observed are DC bus voltage, the PV power, the PV voltage, and the PV current, respectively. The results showed that the DC bus voltage raised and steady at the 377.3 V, the solar power increased to 2 kW, and the PV current decreased to approximately 7 A. The DC load is connected across the boost converter output. The solar PV system operates in both maximum power point tracking and de-rated voltage control modes. To track the maximum power point (MPP) of the solar PV, the two MPPT techniques incremental conductance and PO might have been chosen.","PeriodicalId":309293,"journal":{"name":"Jurnal Litek : Jurnal Listrik Telekomunikasi Elektronika","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125497604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analisis Parameter Bit Error Rate 10 Gbps OFDM-RoF dengan Sistem Mapping 4-QAM","authors":"Ryan Andre Aprillian, Eka Wahyudi, Kholidiyah Masykuroh","doi":"10.30811/LITEK.V18I2.2301","DOIUrl":"https://doi.org/10.30811/LITEK.V18I2.2301","url":null,"abstract":"Radio over Fiber (RoF) adalah teknologi hybrid yang menggabungkan teknologi serat optik dan gelombang radio dengan kecepatan akses yang tinggi. Orthogonal Frequency Division Multiplexing (OFDM) merupakan teknik transmisi data dengan pembawa multicarrier dalam sinyal yang saling tegak lurus. Kinerja dari sistemRoF bergantung pada modulator optik, saluran fiber optik, dan tingkat daya yang digunakan. Variasi daya laser yang digunakan adalah -8 sampai 8 dBm. Variasi subcarrier 128, 256, 512, 1.204, 2.048, 4.096, 8.192. Jarak fiber optik yang digunakan 100 km dan 150 km serta panjang gelombang 1550 nm. Model jaringan OFDM-RoF pada jarak 100 km memiliki performansi yang baik pada subcarrier 512, 1.024, 2.048, 4.096, 8.192. Sedangkan untuk jarak 150 km memiliki performansi yang baik pada subcarrier 8.192. Daya laser yang bagus pada jarak 100 km adalah -6 sampai 8 dBm. Sedangkan untuk jarak 150 km adalah 3 sampai 8 dBm.","PeriodicalId":309293,"journal":{"name":"Jurnal Litek : Jurnal Listrik Telekomunikasi Elektronika","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125776833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rancang Bangun Panel Automatic Transfer Switch (ATS) untuk Daya Satu Phasa Berbasis Web Server","authors":"Lisa Fitriani Ishak, Bayu Kurniawan","doi":"10.30811/LITEK.V18I2.2292","DOIUrl":"https://doi.org/10.30811/LITEK.V18I2.2292","url":null,"abstract":"Rancang bangun panel Automatic Transfer Switch (ATS) untuk daya satu phasa berbasis web server bertujuan untuk membuat sistem modul panel ATS yang mampu untuk memindahkan sumber listrik utama ke cadangan atau sebaliknya, menghitung tingkat presisi sistem parameter panel ATS melalui tampilan Liquid Crystal Display (LCD) dan web server yang diakses pada browser . Alat untuk perbandingan pembacaan metering menggunakan digital tang meter. Bahan yang digunakan pada rancang bangun panel ATS berupa unit mikrokontroler arduino mega 2560 + Ethernet Shield , sensor tegangan dan arus PZEM-004T, magnetik kontaktor. Metode yang digunakan adalah metode pengujian sistem secara langsung dan trial e rror . Hasil dari pengujian rancang bangun panel ATS pada pembacaan arus dan tegangan pada tampilan LCD dan web server rata-rata kesalahan dalam penampilan adalah 0,39% dan untuk sistem panel ATS sudah bekerja sesuai dengan perencanaan.","PeriodicalId":309293,"journal":{"name":"Jurnal Litek : Jurnal Listrik Telekomunikasi Elektronika","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125918524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analisa Pengaruh Tegangan Harmonik Terhadap Regulasi Tegangan Eksitasi Generator Satu Fasa","authors":"Azhar Azhar","doi":"10.30811/LITEK.V18I2.2309","DOIUrl":"https://doi.org/10.30811/LITEK.V18I2.2309","url":null,"abstract":"Esensinya setiap generator listrik satu fasa maupun tiga fasa telah dilengkapi dengan sistem eksitasi. Sistem eksitasi generator ada tiga, yaitu sistem eksitasi statis, dinamis, dan tanpa sikat arang (brushless excitation). Umumnya sistem eksitasi digunakan untuk mengatur suplai arus searah pada kumparan medan yang terdapat pada rotor generator agar tegangan keluaran generator tetap stabil. Sistem eksitasi harmonik merupakan suatu sistem eksitasi tegangan medan rotor generator yang diperoleh dari suplai tegangan kumparan harmonik pada stator. Tegangan keluaran dari kumparan harmonik merupakan sumber arus bolak balik atau tegangan harmonik yang akan diteruskan ke regulator tegangan arus searah untuk diatur agar tegangan tetap stabil dan menjadi sumber tegangan eksitasi medan rotor generator. Regulator tegangan eksitasi medan rotor generator ini bekerja berdasarkan perubahan nilai beban. Jika tegangan keluaran generator turun akibat kenaikan beban maka regulator tegangan akan meningkatkan tegangan eksitasi medan rotor generator dan jika tegangan keluaran generator naik akibat penurunan beban maka regulator pengatur tegangan akan menurunkan tegangan eksitasi medan rotor generator. Tujuan penelitian ini adalah untuk mendapatkan suatu besaran tegangan yang telah dilakukan oleh regulator tegangan arus searah untuk diteruskan pada kumparan medan guna membangkitan medan magnet rotor sehingga menghasilkan tegangan keluaran generator tetap stabil. Dalam penelitian ini metode yang digunakan adalah metode perbandingan tegangan keluaran kumparan harmonik arus bolak balik dan tegangan regulasi arus searah sebagai tegangan eksitasi medan rotor generator satu fasa. Generator arus bolak balik satu fasa 3 kVA diputar pada putaran nominal 1500 rpm dan dibebani pada kapasitas beban 0% (0 kW), 50% (1,82 kW) dan 80% (2,91 kW). Tegangan keluaran kumparan harmonik 60,8 - 70.9 VAC disearahkan dan diregulasi oleh regulator tegangan eksitasi menjadi 48.9 - 49.9 VDC. Berdasarkan hasil pengukuran yang dilakukan pada regulator tegangan eksitasi untuk beban 0 kW rata-rata tegangan eksitasi adalah 45,99 VDC, beban 1,82 kW rata-rata tegangan eksitasi 49,29 VDC dan tegangan eksitasi beban 2,91 kW yaitu 49.98 VDC.  Dari hasil analisa perbandingan tegangan keluaran kumparan harmonik dengan tegangan eksitasi pada beban 0%, 50% dan 80% menunjukkan bahwa komponen daya, perubahan beban dari keadaan tanpa beban 0% sampai 80%, tegangan keluaran generator masih tetap stabil direntang tegangan 219,2 - 220,2 Volt. Sedangkan faktor daya berubah 0,1 yaitu dari 0,89 turun menjadi 0,87. Untuk frekuensi listrik masih tetap pada 49,99 - 50 Hz.","PeriodicalId":309293,"journal":{"name":"Jurnal Litek : Jurnal Listrik Telekomunikasi Elektronika","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116494278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimasi Utilitas Resource LTE 1.800 MHz pada Site WNG114 Tempursari Provider Telkomsel dengan Metode Physical dan Parameter Tunning","authors":"Mohamad Ajijul Hakim, Muntaqo Alfin Amanaf, Eka Wahyudi","doi":"10.30811/LITEK.V18I2.2306","DOIUrl":"https://doi.org/10.30811/LITEK.V18I2.2306","url":null,"abstract":"Saat ini, tingkat trafik atau penduduk meningkat pada area Kabupaten Wonogiri, sehingga peningkatan trafik mempengaruhi kualitas sinyal yang ada pada area tersebut khususnya jaringan LTE. Dalam hal ini, provider Telkomsel melakukan terobosan dengan objective Red Site Solution , yaitu penambahan band LTE 1.800 MHz yang sebelumnya hanya band L900 MHz di WNG114 Tempursari. Dari hasil penambahan band L1800 MHz yang telah dilakukan pada area tersebut ternyata masih terdapat issue , salah satunya yaitu antara band L900 dengan L1800 MHz pada sisi utilitas resource masih tidak seimbang ( unbalance ), sehingga mengakibatkan trafik yang terjadi lebih kecil dari kemampuan yang seharusnya. Hal ini menandakan perlu dilakukan optimasi untuk meningkatkan kualitas jaringan LTE yang ada di site WNG114 Tempursari, dengan menggunakan metode physical dan parameter stuning . Hasil yang didapat setelah optimasi, dari utilitas resource sector 1 sudah menjadi balance . Hal ini dikarenakan nilai gap yang dihasilkan sudah ≤20%, yaitu 18%. Nilai rata-rata payload yang didapat mulai dari tanggal 17 Mei 2021 sampai 23 Mei 2021 (1 minggu) berkisar 363,84 GB. Nilai tersebut dapat dikatakan sudah mencapai target yang telah ditentukan yaitu > 241,28 GB. Rata-rata payload dan jumlah user dari bulan april sampai juli mendapatkan 57,50% atau 355,57 GB pada payload , dan rata-rata jumlah user 53,12 % atau 308,85 user . Hal ini menandakan on air L1800 pada site WNG114, dan dilakukannya optimasi mengalami peningkatan dari sebelumnya.","PeriodicalId":309293,"journal":{"name":"Jurnal Litek : Jurnal Listrik Telekomunikasi Elektronika","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116436057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rancang Bangun Prototype Sistem Kendali Keamanan pada Jendela Pintar Berbasis Internet of Thing","authors":"F. Firdaus, M. Basyir, Aidi Finawan","doi":"10.30811/LITEK.V18I2.2305","DOIUrl":"https://doi.org/10.30811/LITEK.V18I2.2305","url":null,"abstract":"Jendela dan gorden merupakan suatu interior rumah yang berfungsi sebagai sirkulasi udara, ruang pemberi intensitas cahaya dan sebagainya. Pembukaan dan penutupan jendela dan gorden biasanya masih dilakukan oleh manusia secara manual. Terkadang manusia tidak dapat sepenuhnya mengawasi lingkungan apabila terjadi hujan atau malam hari tiba, jendela dan gorden masih dalam keadaan terbuka. Untuk itu maka diperlukan perancangan otomatis dan manual dimana pada perancangan otomatis yang dapat menutup, membuka jendela dan gorden sesuai dengan kondisi cuaca, maupun perubahan suhu di dalam ruangan. Sedangkan pada manual menutup, membuka jendela dan gorden dapat di kontrol melalui smatrphone maupun dapat dibuka secara langsung menggunakan keypad. Penelitian ini membahas tentang pengontrolan jendela dan gorden berdasarkan suhu ruangan, perubahan intesitas cahaya dan perubahan cuaca. Pengendali yang dipakai adalah Arduino Mega 2560 dengan Wifi Built-in-ESP 8266 sebagai pengendali sistem.","PeriodicalId":309293,"journal":{"name":"Jurnal Litek : Jurnal Listrik Telekomunikasi Elektronika","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124679395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analisis Implementasi Jaringan FTTH dan FTTB di Gedung Perkantoran","authors":"Ferry Erwanto, Eka Wahyudi, Fauza Khair","doi":"10.30811/LITEK.V18I2.2300","DOIUrl":"https://doi.org/10.30811/LITEK.V18I2.2300","url":null,"abstract":"Penelitian ini berfokus pada perbandingan penerapan jaringan Fiber to The Home (FTTH) dan Fiber to The Building (FTTB) di gedung DSP IT Telkom Purwokerto menggunakan teknologi 10-Gigabyte Passive Optical Network (XGPON). Tujuan penelitian ini meninjau performansi antara penerapan jaringan FTTH dan FTTB di gedung bertingkat. Parameter perbandingan yang digunakan meliputi Link Power Budget (LPB), Rise Time Budget (RTB), Q Factor dan Bit Error Rate (BER). Berdasarkan hasil perhitungan teoritis dan simulasi pada penerapan jaringan FTTH didapatkan nilai pada perhitungan LPB sebesar -22,75 dBm dan simulasi sebesar -21,35 dBm. Sedangkan untuk perhitungan RTB dengan menggunakan pengkodean NRZ didapatkan nilai sebesar 0,04 ns ( threshold sebesar 0,07 ns). Berdasarkan hasil simulasi didapatkan nilai Q Factor sebesar 12,13 dan nilai BER sebesar 3,68703×10 -3 4 , sedangkan hasil simulasi didapatkan nilai Q Factor sebesar 7,62 dan nilai BER sebesar 1,22832×10 -14 . Berdasarkan hasil perhitungan teoritis dan simulasi pada penerapan jaringan FTTB didapatkan nilai pada perhitungan LPB sebesar -11,62 dBm dan nilai pada simulasi sebesar -11,29 dBm. Sedangkan untuk perhitungan RTB dengan menggunakan pengkodean NRZ didapatkan nilai RTB sebesar 0,04 ns ( threshold sebesar 0,07 ns). Berdasarkan hasil pada perhitungan nilai Q Factor sebesar 6,31 dan nilai BER sebesar 1,42864×10 -10 , sedangkan berdasarkan hasil simulasi didapatkan nilai Q Factor sebesar 4,58 dan nilai BER sebesar 1,92987×10 -6 . Oleh karena itu dapat disimpulkan bahwa penerapan jaringan FTTH dengan menggunakan teknologi XGPON memiliki nilai perfomansi lebih baik jika dibandingkan dengan penerapan FTTB.","PeriodicalId":309293,"journal":{"name":"Jurnal Litek : Jurnal Listrik Telekomunikasi Elektronika","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114883304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Inverter Performance in Grid-Connected Photovoltaic System","authors":"Radhiah Radhiah","doi":"10.30811/LITEK.V18I1.2120","DOIUrl":"https://doi.org/10.30811/LITEK.V18I1.2120","url":null,"abstract":"Inverter, as one of photovoltaic (PV) system’s component coordinates various operating states such as supplying power to the grid, purchasing electricity from the grid and self-supply with solar power. Since we notice that PV power supply is a one-way process, where current only flows from PV generator in one direction directly into the grid and gradually coming to an end. In its place, self-supply with solar power is gaining important. In medium voltage range, particularly inverters are also increasingly undertaking tasks to stabilize the grid during voltage fluctuations.This paper reviews the inverter performance in a PV system that is integrated with a power distribution network (i.e., medium to low voltage), or we called it grid-connected PV system. Since the PV system is connected to the public grid, then the inverter eventually called “grid-tie inverter” (GTI). In general, the inverter used is a centralized inverter with settings based on the multiple power point tracker (MPPT) algorithm. The MPPT control is installed on both DC and AC sides which requires a voltage setting that is in accordance with the PV system.","PeriodicalId":309293,"journal":{"name":"Jurnal Litek : Jurnal Listrik Telekomunikasi Elektronika","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125121071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}