Yustini Yustini
Jurusan Teknik Elektro Politeknik Negeri Padang

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Pemampatan Data Digital Menggunakan Metoda Run-Length Yustini, Yustini; Octavia, Hadria
POLI REKAYASA Vol 3, No 2 (2008)
Publisher : POLI REKAYASA

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Abstract

Data compression can be very effective when we used and store a file while that file has an enormous size. Run-Length method is used in data compression which has repeated characters. Run-Length method is the most effective method used in compression especially for graphics files, which it has array contain the same length of the character. When the same character received three times or three times in the form of arrays, this algorithm compressing data in the form of three array characters.
Video Streaming dengan Videolan Project Asril, Aprinal Adila; Yustini, Yustini; Guspian, Reza
JURNAL ILMIAH ELEKTRON Vol 1, No 2 (2009)
Publisher : JURNAL ILMIAH ELEKTRON

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Abstract

Streaming is process of continuing data sending by broadcasting trough internet which showed by streaming application at PC client. The sending data packaging is compressing to make sending process is easy. Streaming can be done by input media variation and client has a change to benefit just after server sending the distreaming data and running in VLC media player. VideoLAN Client (VLC) is a media to streaming which can be applied as transmitter and receiver. VLC can compress and decompress audio and video data from some input media. It shows data result of streaming which have picture and voice quality as well as the source.
Sistem Pengiriman Data Menggunakan Modulasi ASK (AMPLITUDO SHIFT KEYING) Untuk Mendeteksi Level Ketinggian Air Sungai Yustini, Yustini; Lifwarda, Lifwarda; Asril, Aprinal Adila; Chandra, Dikky
JURNAL ILMIAH ELEKTRON Vol 3, No 1 (2011)
Publisher : JURNAL ILMIAH ELEKTRON

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Abstract

People surrounding the river have many problems when the water increasing, for example is the flood problem. To inform the changing of water level is required a device to monitoring. It can be used to forewarn the society arround the river to reduce the risk of disasters caused by water. Design of this system uses radio frequency as the medium of data transmission. The circuit system consists of the transmitter and receiver. This device can monitor the changing of water level by the level water sensor. It can detect the height of water and directly turn on relay and transmitter sequence. In next step, this circuit transmit the information into receiver immediately and activated an indicator that can be heard as buzzer and display data status the water level in LCD.
Perancangan Dan Realisasi Antena Mikrostrip Monopole Segiempat Pada Frekuensi 546 Mhz Untuk Aplikasi Dvb-T asril, aprinal adila; yustini, Yustini; Oktavia, Hadria
Elektron : Jurnal Ilmiah Vol 11 No 1 (2019): Elektron Jurnal Ilmiah
Publisher : Teknik Elektro Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/eji.11.1.96

Abstract

Antena mikrostrip adalah suatu konduktor metal yang menempel diatas groundplane yang diantarannya terdapat bahan dielektrik. Antena mikrostrip terdiri atas 3 bagian utama yaitu patch, substrate dan groundplane. Antena mikrostrip yang dapat digunakan dalam konsep aplikasi DVB-T. Sistem DVB-T (Digital Video Broadcasting Terestrial), merupakan sistem penyiaran langsung dari pemancar bumi (terrestrial). Pada penelitian ini dibuat antena mikrostrip monopole untuk DVB-T dengan menggunakan PCB double layer dan software Zeland. Antena ini dirancang pada frekuensi 546 MHz. Bahan yang digunakan adalah PCB epoxy (FR4) double layer dengan ketebalan bahan 1.6 mm dan konstanta dielektrik sebesar 4.7 mm. Antena mikrostrip tersebut diuji untuk mendapatkan nilai frekuensi resonansi, bandwidth, VSWR, HPBW, Gain dan polaradiasi yang kemudian hasilnya dibandingkan dengan hasil simulasi menggunakan software Zeland Program Manager (IE3D). Pada hasil pengukuran antena diperoleh hasil untuk antena mikrostrip diantaranya nilai return loss = -25 dB pada frekuensi = 545 MHz, bandwidth = 140 MHz, dengan nilai VSWR = 1.48 dB, HPBW = 75o dan polaradiasi berbentuk Bidirectional.
VIDEO STREAMING DENGAN VIDEOLAN PROJECT Adila.A, Aprinal; yustini, Yustini
Elektron : Jurnal Ilmiah Vol 1 No 2 (2009): Elektron Jurnal Ilmiah
Publisher : Teknik Elektro Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/eji.1.2.23

Abstract

Streaming is process of continuing data sending by broadcasting trough internet which showed by streaming application at PC client. The sending data packaging is compressing to make sending process is easy. Streaming can be done by input media variation and client has a change to benefit just after server sending the distreaming data and running in VLC media player.  VideoLAN Client (VLC) is a media to streaming which can be applied as transmitter and receiver. VLC can compress and decompress audio and video data from some input media. It shows data result of streaming which have picture and voice quality as well as the source.
Proses Tracking Satelit Lapan-Tubsat Dengan Menggunakan Frekuensi S-Band Octavia, Hadria; yustini, Yustini; firdaus, Firdaus
Elektron : Jurnal Ilmiah Vol 6 No 1 (2014): Elektron Jurnal Ilmiah
Publisher : Teknik Elektro Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/eji.6.1.62

Abstract

Satelit LAPAN-TUBSAT yang merupakan satelit mikro pertama yang dibangun LAPAN Indonesia yang bekerja sama dengan Technical University of Berlin (TU-Berlin, Jerman), hingga kini telah dapat menghasilkan gambar video daerah-daerah diwilayah Indonesia sesuai misinya yaitu sebagai satelit surveillance yang mengamati permukaan bumi. Satelit LAPAN-TUBAT ini beredar pada orbit polar, bergerak dan melingkupi seluruh daerah di Indonesia dari timur ke barat seiring dengan rotasi bumi. Untuk memanfaatkan satelit ini secara maksimal maka perlu disiapkan stasiun bumi kendali dan penerima data payload (muatan) satelit terebut. Operasi satelit LAPAN-TUBSAT yang dilakukan melingkupi 2 (dua) hal pokok yaitu operasi pengamatan kondisi kesehatan satelit dan operasi muatan satelit dalam perolehan data video. Sementara fungsi dasar operasi satelit ini melakukan fungsi Telemetri Tracking and Command (TT&C) yaitu melakukan operasi Telemetri, penjejakkan (Tracking) satelit dan operasi pengiriman data komando (Command) ke satelit untuk melaksanakan misi operasinya.  
Penerapan Media Gambar untuk Meningkatkan Hasil Belajar IPA Kelas IX SMP 8 Kunto Darussalam Yustini, Yustini
e-Tech : Jurnal Ilmiah Teknologi Pendidikan Vol 7, No 1 (2019): E-Tech
Publisher : Kurikulum Teknologi Pendidikan Fakultas Ilmu Pendidikan Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/et.v7i1.104173

Abstract

This study is purposed to determine the acquisition of students' science learning achievement by using pictures as learning media in classroom IX of SMP Negeri 8 Kunto Darussalam academic year 2018/2019. Data retrieval was carried out on July 2018 until September 2018. The subjects of this study were students of grade IX  at SMP Negeri 8 Kunto Darussalam, with a total number of students was 26 which consisting of 12 men and 14 women. The measured parameters are students learning achievements in the form of absorption and completeness of learning obtained from quizzes in each meeting and block test in each basic competency. Data were analyzed descriptively. Increased student learning achievements can be seen from the absorption and completeness of students' learning before and after the research. Before doing the research, the absorptive capacity of students was 58% with learning completeness 44%, after action research has been done in Cycle 1 the absorption of students was 68% with learning completeness 82.86% and in Cycle 2 the absorption of students was 78% with 100% learning completeness. While the scientific performance of students in the first cycle (72.8%) and cycle II (85.6%). The results of this study indicate that the use of pictures as a learning media in the learning process can improve the students' learning achievements of class IX at SMP Negeri 8 Kunto Darussalam in the academic year 2018/2019.
Merancang Sistem Pengukuran Redaman Transmisi Kabel Optik Single Mode Jenis Pigtail asril, aprinal adila; yustini, Yustini; Herwita, Putri Azizah
Elektron : Jurnal Ilmiah Vol 11 No 2 (2019): Elektron Jurnal Ilmiah
Publisher : Teknik Elektro Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/eji.11.2.117

Abstract

Optical fiber is a transmission channel made of glass or plastic that is used to transmit light signals from one place to another. Optical fibers, in general, have a basic structure consisting of a fiber core, a fiber coating (cladding), and a protective layer (coating) consisting of an inner jacket. This research discusses the design of the attenuation of the fiber optic transmission measurement system by connection factor. Optical fiber cable used in this research is pigtail type cable with single-mode cable type. The cable used is 10 meters long, which will be installed in the Optical Termination Box. In the Optical Termination Box there are 6 pigtail cables, which are without connections, with a 6 cm sleeve protection one connection and two connections, also with a 4 cm sleeve protection one connection and two connections, then use a barrel adapter. In this design testing tools use Light source, Optical Power Meter, and Optical Time Domain Reflectometer). The attenuation value after testing on the protection sleeve 6cm; 12,330 dB, then the attenuation on the protection sleeve is 4cm; 12,729 dB. Then attenuation on the barrel adapter; 12,954 dB