{"title":"Microstrip Patch Rectangular Susunan Side By Side Multielemen Pada Frekuensi 2.4 Ghz Berbasis Silver Nanowires (Agnws)","authors":"M. R. Hidayat, Irfan Noor Muhammad, Sofyan Basuki","doi":"10.55893/epsilon.v20i1.81","DOIUrl":"https://doi.org/10.55893/epsilon.v20i1.81","url":null,"abstract":"In this study, the design uses three variations for silver nanowires and three variations of patches. Variations of silver nanowires are in the form of length, diameter and number of silver nanowires, while for patches, variations of single patch, double patch and triple patch are used. The microstip antenna uses a patch specification with a thickness of 0.035 mm made of copper, with a density of 1.6 mm for a substrate made of FR-4 epoxy. Based on the observations of the antenna parameters from the characteristics of the silver nanowires variation, the desired results were obtained at variations in diameter of 300 nm, length of 32 mm and the number of 342 silver nanowires in triple patch with return loss = -20,731 dB; VSWR = 1.202; gain = 5,338 dB and directivity = 9,970 dBi. The above results have increased the desired value compared to triple patch microstrip antennas without nanowires with a return loss value = - 16,191 dB; VSWR = 1.366; gain = 5.142 dB and directivity = 9.829 dBi.","PeriodicalId":320715,"journal":{"name":"EPSILON: Journal of Electrical Engineering and Information Technology","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114530560","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}
Mochammad Fadillah Putra, Sutisna, Firmansyah M S Nursuwars, Andri Ulus Rahayu
{"title":"Sistem Mitigasi Terintegrasi Tanggap Darurat Kebakaran Berbasis Internet of Things","authors":"Mochammad Fadillah Putra, Sutisna, Firmansyah M S Nursuwars, Andri Ulus Rahayu","doi":"10.55893/epsilon.v20i1.80","DOIUrl":"https://doi.org/10.55893/epsilon.v20i1.80","url":null,"abstract":"Fire is an event that most often effects both urban and rurals areas. This incident is very dangerous beacause it can cause loss and loss life. Ingeneral, these fire cannot be predicted when and where they will occur. The bigger the fire, the bigger the impact, to minimize the risk of fire, a tool is needed that can provide early fire information that can be monitored so that fires can be handled quickly. With the application of internet of things technology using an ESP32 board via internet network and assisted by fire sensors, gas sensors, and temperature sensors, they are able to detect potential fires early. The data displayed is in the form of fire status, gas leaks, and temperature monitoring So in this study, a tool is made that is able to make it easier to provide fire information with the average time needed for 15.81 seconds and the system is able to provide accurate location because the location set is the identity or address of each of the sensor devices. and gateways. \u0000 ","PeriodicalId":320715,"journal":{"name":"EPSILON: Journal of Electrical Engineering and Information Technology","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125306997","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}
Hajiar Yuliana, Raka Satya Pratama, G. M. Rahmatullah
{"title":"Perencanaan Indoor Building Coverage (IBC) Jaringan 4G LTE di Gedung Fakultas Psikologi Unjani","authors":"Hajiar Yuliana, Raka Satya Pratama, G. M. Rahmatullah","doi":"10.55893/epsilon.v20i1.88","DOIUrl":"https://doi.org/10.55893/epsilon.v20i1.88","url":null,"abstract":"Gedung Fakultas Psikologi Universitas Jenderal Achmad Yani (Unjani) merupakan gedung perkuliahan yang berada di lingkungan kampus Unjani dan belum memiliki instalasi sistem jaringan indoor. Kondisi tersebut menyebabkan level sinyal yang terukur di dalam gedung memiliki nilai RSRP lebih kecil dari -110 dBm. Level sinyal tersebut termasuk dalam kategori kualitas sinyal 4G yang kurang baik. Selain itu faktor lain yang menyebabkan pelemahan sinyal ialah material dan konstruksi bangunan tersebut. Oleh karena itu, agar user pada gedung tersebut dapat terlayani dengan baik, solusi yang dilakukan adalah melakukan perencanaan jaringan Indoor Building Coverage (IBC) 4G. Berdasarkan perhitungan coverage planning jumlah antena yang diperlukan dalam perencanaan sebanyak 14 antena yaitu lantai 1 dan 4 masing-masing sebanyak 3 antena, lantai 2 dan 3 masing-masing sebanyak 4 antena. Berdasarkan hasil simulasi pada software RPS diperoleh persentase nilai rata-rata nilai RSRP >-90 dBm sebesar 89,93 % dan persentase rata-rata nilai SINR >3 dB sebesar 87,95 %. Berdasarkan hasil simulasi tersebut didapatkan bahwa hasil perencanaan yang telah dibuat telah memenuhi standar operator dan dapat diterapkan untuk memperbaiki coverage dan meningkatkan level sinyal di Gedung Fakultas Psikologi Unjani.","PeriodicalId":320715,"journal":{"name":"EPSILON: Journal of Electrical Engineering and Information Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123738750","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":"Aplikasi dan Game Edukasi Sandi Semaphore Berbasis Multimedia","authors":"Yandi Anzari, M. Y. Puriza","doi":"10.55893/epsilon.v19i3.67","DOIUrl":"https://doi.org/10.55893/epsilon.v19i3.67","url":null,"abstract":"Penelitian ini dilatarbelakangi dengan permasalahan pada pembelajaran penyandian semaphore di pramuka yang sering kali menggunakan metode yang monoton sehingga menyebabkan anggota Pramuka kurang tertarik dan kesulitan dalam memahami materi yang disampaikan maka diperlukan alat bantu berupa media pembelajaran berbasis multimedia yang diharapkan dapat membantu dalam proses pembelajaran penyandian di pramuka. Perancangan aplikasi ini menggunakan metode Hierarchy Plus Input – Process – Output (HIPO). HIPO menggunakan tiga macam diagram untuk masing – masing tingkatan, yaitu Visual Table of Contents (VTOC), Overview Diagram (OD), dan Detail Diagram (DD) sehingga menghasilkan sebuah aplikasi yang terdiri dari dua menu utama, yaitu sandi dan permainan, pada menu sandi user dapat melihat animasi yang terdiri dari semua huruf abjad dan kata lain seperti SOS, sedangkan pada menu permainan user di suguhkan dengan permainan edukasi yang berupa susun kata dari kata ke semaphore atau dari semaphore ke kata. Hasil dari penelitian ini diukur dengan kuisioner yang disebarkan ke anggota pramuka di yogyakarta khusus nya anggota pramuka yang ada di UII, dari hasil kuisioner diperoleh bahwa aplikasi ini dapat membantu dalam proses pembalajaran di sandi semaphore","PeriodicalId":320715,"journal":{"name":"EPSILON: Journal of Electrical Engineering and Information Technology","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116749965","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 Pengaruh Sistem Eksitasi Terhadap Tegangan Keluaran Generator Sinkron Mini Hydro","authors":"Dede Furqon Nurjaman","doi":"10.55893/epsilon.v19i3.71","DOIUrl":"https://doi.org/10.55893/epsilon.v19i3.71","url":null,"abstract":"Dynamic loading or changing at any time will have an impact on the generator, one of the effects is the change in the generator terminal voltage. So that every generator that contributes to the interconnection system is required to be ready to face any system changes. The purpose of this research is to determine the effect of the excitation current on the generator voltage. \u0000 \u0000 \u0000In this study, the data obtained were carried out by direct observation, namely by taking the required data and carrying out experimental methods by conducting several experiments in obtaining data, such as operating a generator and to get the value of the generator loading to be analyzed. with the measurement method. \u0000 \u0000 \u0000The results indicate that the voltage of the synchronous generator Mini Hydro Curug is strongly influenced by the size of the excitation current setting, this can be seen at the time of loading the generator, when the excitation current is 2.2 A, the generator output voltage value is 6.133 kV. , and the highest generator output voltage is at a value of 6.479 kV with an excitation current of 4.6 A. \u0000 \u0000 ","PeriodicalId":320715,"journal":{"name":"EPSILON: Journal of Electrical Engineering and Information Technology","volume":"283 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131853434","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}
Fakhruddin Mangkusasmito, E. Ariyanto, M. Syafruddin
{"title":"Simulasi Pengaman Pada Saluran Kabel Tegangan Tinggi Berupa Line Current Differential (LCD) Berbasis Arduino Mega 2560 Dengan Tampilan Human Machine Interface dan Notifikasi Blynk","authors":"Fakhruddin Mangkusasmito, E. Ariyanto, M. Syafruddin","doi":"10.55893/epsilon.v19i3.73","DOIUrl":"https://doi.org/10.55893/epsilon.v19i3.73","url":null,"abstract":"Power transmission protection is a system that serves as a safety in the electrical equipment of a transmission network so that the process of channeling electrical energy to the consumer can run well. The power transmission system of the generating system can be through Extra High Voltage Overhead Line, High Voltage Overhead Line, and High Voltage Underground Cable. In each transmission line is required protection system that can protect the electricity distribution process to the consumer. High voltage underground cable is a transmission system that delivers electrical energy through a cable that is buried in the ground. Although it is in the ground and protected by an excellent insulation system, but does not escape also from the occurrence of interference. In the land cable channel protection system is known as the Line Current Differential (LCD) which is a protection system that works under Kirchoff Law 1 by comparing incoming flows and exiting flows, with uptime instantaneously. This research made a simulation of such system, using Arduino Mega 2560 and be equipped with Internet of Things (IoT) monitoring using Blynk. The test result indicated that the system can work properly","PeriodicalId":320715,"journal":{"name":"EPSILON: Journal of Electrical Engineering and Information Technology","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128781250","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":"Perancangan Continuity Tester Pada Proses Pengkabelan Pesawat","authors":"Fauzia Haz, Arifil Fikri, Giri Angga Setia","doi":"10.55893/epsilon.v19i3.69","DOIUrl":"https://doi.org/10.55893/epsilon.v19i3.69","url":null,"abstract":"In the process of making aircraft, it requires strict standard requirements in accordance with the requirements that have been regulated in the world of aviation. One example is in the manufacture of a series of aircraft harness cables at the Harnessing Shop PT. Dirgantara Indonesia having many stages, including cable marking, looming, connection, continuity, insulation. Of course, for each stage is inspected. In continuity testing, it is done manually using a multimeter so it requires at least 3 people and the testing process is considered quite long. Given these problems, it is necessary to have a replacement multimeter in continuity testing to speed up and simplify the testing process. \u0000 \u0000The continuity testing tool uses the Arduino Mega 2560, IC LM317T microcontroller, relay as the main component. The microcontroller is used to process the reading data according to the datasheet drawing, the LM317T IC is used to regulate the output voltage from the Arduino which will be converted to a resistance value, the relay is used to detect the position of the second end point in continuity testing. A user interface web browser is used to operate the tool and display data from the results of continuity testing. \u0000 \u0000From the test results, it is found that the readings of the suitability of the installation point are in accordance with the actual cable harness and the resistance value is close to the same compared to using a multimeter. The passed statement will appear when the actual point reading of the cable harness is in accordance with the datasheet drawing, while the failed statement will appear when the actual point on the wiring harness does not match the datasheet drawing. The test results are in the form of excel data which can be easily stored by the operator. \u0000 ","PeriodicalId":320715,"journal":{"name":"EPSILON: Journal of Electrical Engineering and Information Technology","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126408714","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}
Muhammad Akbar Wibowo, Ni Ketut Hariyawati, Hajiar Yuliana
{"title":"Simulasi Optimasi Jaringan 4G Indosat Ooredoo Di Daerah Bandung Timur Menggunakan Metode Electrical Tilt","authors":"Muhammad Akbar Wibowo, Ni Ketut Hariyawati, Hajiar Yuliana","doi":"10.55893/epsilon.v19i3.68","DOIUrl":"https://doi.org/10.55893/epsilon.v19i3.68","url":null,"abstract":"Pemanfaatan komunikasi teknologi 4G diharapkan menghasilkan kecepatan jaringan sangat cepat bagi para pengguna. Namun, teknologi 4G ini memiliki beberapa kendala yang menyebabkan kecepatan jaringan menjadi berkurang dan tidak optimal. Untuk mengatasi hal tersebut maka perlu dilakukan optimasi jaringan untuk memperbaiki kualitas jaringan agar dapat dipakai dengan optimal. Pada penelitian ini dilakukan proses optimasi untuk memperbaiki kondisi level sinyal Reference Signals Received Power (RSRP) khususnya di area Bandung Timur. Proses optimasi dilakukan dengan menggunakan metode electrical tilt. Optimasi dilakukan dengan menganalisis kondisi level sinyal RSRP aktual berdasarkan hasil drive test kemudian disimulasikan dengan menggunakan Atoll Planning Software. Berdasarkan hasil drive test, didapatkan 7 area badspot dengan level RSRP di bawah -100 dBm, dan area tersebut merupakan area dengan aktifitas kepadatan penduduk yang tinggi. Setelah dilakukan simulasi optimasi electrical tilt dari beberapa site yang telah ditentukan berdasarkan hasil analisis, terdapat perbaikan kondisi level sinyal RSRP jika dibandingkan dengan kondisi aktual. Perbaikan ditunjukkan dengan adanya kenaikan persentase untuk RSRP > -100 dBm dari 83,379% menjadi 86,066%, dan juga terjadi penurunan RSRP < -100 dBm yaitu dari 17,621% menjadi 13,934%. Hal tersebut menunjukkan optimasi yang dilakukan dapat memperbaiki kondisi level sinyal RSRP di area Bandung Timur.","PeriodicalId":320715,"journal":{"name":"EPSILON: Journal of Electrical Engineering and Information Technology","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132592406","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":"Desain Sistem Pembangkit Listrik Tenaga Hybrid (Solar Cell dan Wind Turbine) untuk Beban Perumahan","authors":"Giri Angga Setia, Sutriyadi, Naftalin Winanti, Fauzia Haz, Handoko Rusiana Iskandar","doi":"10.55893/epsilon.v19i2.58","DOIUrl":"https://doi.org/10.55893/epsilon.v19i2.58","url":null,"abstract":"Pembangkit Listrik Tenaga Hybrid (PLTH) merupakan pembangkit listrik yang terhubung dari beberapa jenis sumber pembangkit energi terbarukan atau dengan sumber energi tidak terbarukan. Terbatasnya sumber energi konvensional menjadi penyebab dikembangkannya pemanfaatan energi non konvensional atau energi terbarukan di Indonesia. Salah satu energi yang potensial untuk dikembangkan di Indonesia adalah energi surya dan energi bayu. Penelitian ini bertujuan untuk melakukan desain terhadap PLTH skala kecil, kemudian menganalisis daya keluaran (output) yang dihasilkan ketika pembangkit hybrid bekerja dengan menggunakan baterai sebagai indikator. Proses terjadinya pengontrolan dengan menggunakan display tegangan sebagai media untuk mengetahui tegangan pada masing masing pembangkit dan baterai. Metode pertama yang dilakukan adalah studi potensi kedua energi tersebut. Kemudian melakukan perhitungan kapasitas yang dibutukan oleh setiap komponen. Selanjutnya adalah menyusun desain pembangkit yang telah diperhitungkan kapasitasnya menjadi sebuah pembangkit hybrid. Langkah terakhir adalah mengimplementasikan desain pembangkit tersebut untuk diterapkan ke beban rumah tangga skala kecil 40 Watt diantaranya 2 buah lampu dan 1 buah kipas angin. Berdasarkan hasil desain yang dilakukan pada solar cell didapat kapasitas ukuran modul 40 Wp, fill factor sebesar 0.73 dan efisiensinya 13% sedangkan desain wind turbine didapat daya sebesar 1.169 Watt dengan kecepatan angin 3,5 m/s dan efisiensinya terbesar mencapai 64%. Kemudian kapasitas solar charge controller sebesar 2.32 A, kapasitas inverter 50 Watt, dan energi total baterai 3.33 Ah. Pengisian baterai untuk mencapai 20%-100% kapasitas membutuhkan waktu 6.6 jam saat cuaca cerah dan 8.3 jam saat cuaca mendung.","PeriodicalId":320715,"journal":{"name":"EPSILON: Journal of Electrical Engineering and Information Technology","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131989050","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}
Muchamad Ilham Fakhri, Tata Supriyadi, Griffani Megiyanto Rahmatullah
{"title":"Prototipe Smart Emergency Untuk Pemberitahuan Kondisi Kesehatan Mahasiswa Menggunakan Ktm Sebagai Scan Barcode Kamera Berbasis Iot","authors":"Muchamad Ilham Fakhri, Tata Supriyadi, Griffani Megiyanto Rahmatullah","doi":"10.55893/epsilon.v19i2.63","DOIUrl":"https://doi.org/10.55893/epsilon.v19i2.63","url":null,"abstract":"Kebugaran melambangkan hal yangipenting pada kehidupan manusia. Kondisi kesehatan seseorang yang dapat dicek pada bagian tubuh, seperti detak jantung, saturasi oksigen dan suhu badan. Alat medis seperti thermometer digital dan EKG (Elektrokardiogram) menjadi hal yang lumrah digunakan pemeriksaan di rumah sakit tetapi dilakukan secara terpisah. Solusi untuk saat ini dapat direalisasikan dalam monitoring kondisi kesehatan untuk mahasiswa dengan memakai aplikasi android memakai kerangka android seperti framework Flutter. Framework tersebut dapat diintegerasikan dengan google firebase yang dapat digunakan dalam penyimpanan data pasien mahasiswa. Cara kerja dari system yaitu pengguna harus melakukan scan barcode KTM untuk memasukkan data secara manual saat melakukan pengecekan. Setelah memasukan data pengguna langsung melakukan pengecekan terhadap detak jantung, saturasi oksigen, suhu dan diproses oleh NodeMCU yang bertindak sebagai pengolah data. Perhitungan denyut nadi dan SPO2 memanfaatkan sensor MAX30100 dan suhu tubuh memanfaatkan sensor MLX90614 melalui OLED 128x64 untuk menampilkan data lalu pengguna memasukan data secara manual pada aplikasi smarphone yang sudah terhubung pada google firebase sebagai penyimpanan data. Sistem telah diuji dengan 10 kali pengujian input data sensor dan 5 kali untuk pengujian pada aplikasi menggunakan KTM yang berbeda. Hasilnya yaitu sistem dapat mendeteksi detak jantung, saturasi oksigen dan suhu dengan akurasi berkisar 97% dan komunikasi data ke webserver dilakukan realtime. Pengembangan lebih lanjut dengan melakukan integrasi sistem lebih besar antara Google Firebase dengan perangkat keras tambahan seperti real time clock, keypad dan lainnya.","PeriodicalId":320715,"journal":{"name":"EPSILON: Journal of Electrical Engineering and Information Technology","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122579884","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}