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INDONESIA
Jurnal Teknik Elektro
Published by Universitas Trisakti
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
Electrical & Electronics Engineering
Arjuna Subject : -
Articles 6 Documents
 1 
Search results for , issue " Vol 4, No 1 (2004)" : 6 Documents clear
ANALISIS PERBANDINGAN KOMPRESI DATA DENGAN TEKNIK ARITHMETIC CODING DAN RUN LENGTH ENCODING Gozali, Ferrianto; Mervyn, Mervyn
Jurnal Teknik Elektro Vol 4, No 1 (2004)
Publisher : Jurnal Teknik Elektro

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Abstract

Data transmission and data storage cost money. The more information being dealt with, thehigher the cost is needed. In spite of this, most digital data are not stored in the mostcompact form. Rather, they are stored in whatever way makes them easiest to use, such as:ASCII text from word processors, binary code that can be executed by a computer, etc.Typically, these easy-to-use encoding methods require larger size data files than theyactually need to represent the information. Data compression is the general term for thevarious algorithms and programs developed to address this problem. The aim of datacompression is to reduce redundancy in stored data or transmitted data, thus increasingeffective data density. A compression program is used to convert data from an easy-to-useformat to one optimized for compactness. In this paper, we examine and analyze two basicmethods in data compression called Run Length Encoding and Arithmetic coding. Aframework for evaluation and comparison of these two methods is constructed and appliedto the algorithms presented. Comparisons of both theoretical and empirical natures arebriefly reported in this paper. The compression programs for these two methods of datacompression are developed using Java programming language. The program is used tocompress number of different sizes document type files to measure the time spent for thecompression, the time to reconstruct and the size of the compressed data files to get thecompression ratio. The result indicated that arithmetic coding method has compression ratio1,14 up to 2,61 higher than run length encoding while it takes times 1,114 –1,564 and 2,85 –5,635 longer than time needed by Run Length encoding methods. We can conclude that thereare typical tradeoffs between the amount of compression, the runtime, and the quality of thereconstruction. Depending on the application, one might be more important than anotherand one would want to pick the method appropriately.Keywords: Kompresi Data, Run Length Encoding, Arithmetic Coding, Compression ratio.
MAXIMIZING TCP THROUGHPUT AND FAIRNESS INDEX IN WIRELESS CDMA NETWORKS Ningsih, Yuli Kurnia; Wiryanto, Andy
Jurnal Teknik Elektro Vol 4, No 1 (2004)
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CDMA merupakan suatu metode akses yang digunakan oleh teknologi komunikasi. CDMAmenggunakan teknologi spektrum tersebar. CDMA sekarang ini tidak hanya digunakanuntuk komunikasi suara saja, tetapi juga untuk data. Untuk itu TCP throughput memegangperanan penting dalam hal ini. Tetapi banyak pula masalah – masalah yang muncul, yangpaling serius adalah menurunnya performa throughput dan ketidaksamaan tiap throughputyang diterima user karena perbedaan yang mencolok dari koneksi RTT (Round Trip Times)yang dishare pada jaringan wireless yang sama.Telah banyak solusi yang diusulkan untukmeningkatkan performa TCP throughput, tetapi solusi-solusi tersebut tidak cocok untukjaringan wireless karena masih menghasilkan rugi-rugi transmisi. Pada paper ini, akandidemonstrasikan bahwa masalah ketidaksamarataan throughput dapat dipecahkan melaluimanajemen power (power control) yang sesuai. Secara khusus untuk mengatasi masalahtersebut, dalam paper ini akan coba diusulkan cara dengan membiarkan koneksi denganRTT yang lebih panjang dan dengan power yang lebih besar. Dengan begitu, solusi inidiharapkan dapat meningkatkan kesamarataan throughput tiap user. Evaluasi dari performaakan dilakukan dengan NS2 Simulator. Secara khusus, dapat dibandingkan dengan solusisolusistandard wireless CDMA, solusi ini dapat menjamin lebih baik throughput TCP yangdihasilkan dan keseimbangan throughput tersebut.Keywords: Sistem Komunikasi, Jaringan Informasi, Analytical and Numerical Simulation
PENGUJIAN HARMONISA DAN UPAYA PENGURANGAN GANGGUAN HARMONISA PADA LAMPU HEMAT ENERGI Liem Ek Bien, Liem Ek Bien; Sudarno, Sudarno
Jurnal Teknik Elektro Vol 4, No 1 (2004)
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Harmonic (current or voltage) is one of the problems that has to be solved in electric powersystem, especially that caused by non-linear loads. Harmonic could cause bad impacts forthe electric components that sensed it. It is almost certain that using of fluorescent lamp withelectronic ballast or it is called energy saving lamp can cause harmonic in electric powersystem. Considering of the using of energy saving lamp is increased fairly fast as residenceand office lighting, so it is important to analyze and solve the harmonic that caused byenergy saving lamp. From the harmonic analysis, we can know the harmonic distortioncaused by energy saving lamp. And there are some efforts to reduce such harmonicdistortion by using a simple harmonic filter.Keyword: power quality, harmonic, harmonic filter.
PERANCANGAN DAN IMPLEMENTASI CHIP FAST MULTIPLIER TRACHTENBERG METODE DUA JARI DENGAN BAHASA PEMROGRAMAN PERANGKAT KERAS AHDL PADA EPF10K30ETC144-1 Thomas, Thomas
Jurnal Teknik Elektro Vol 4, No 1 (2004)
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Abstract

This paper focuses on the process of designing and implementation of fast multiplier chipusing Trachtenberg method that is usually used for fast arithmetic computation in learningcalculation. By combining fast Trachtenberg method and fast hardware implementation insilicon chip, the faster multiplier will be produced. The performance of multiplier is essentialpart in determining the performance of digital signal processing system. In the era of digitalsystem nowadays, it needs the faster signal processing system due to the massive data to beprocessed especially in the real time system. The process of chip design initiates withdesigning all modules needed to build the fast multiplier chip. After all the modules workproperly by simulated verification, all the modules will be combined together to create thefast multiplier chip. There are two Trachtenberg methods, they are direct method and twofinger method. In this paper, Trachtenberg Two Finger method is used for designing of fastmultiplier on the EPF10K30ETC144-1 target device in AHDL (Altera Hardware DescriptionLanguage) code. Based on the results of the verification process, Trachtenberg two fingermethod fast multiplier can work properly in 27.47 MHz maximum speed using 76 % of thetarget device.Keywords: Design, implementation, fast, multiplier, Trachtenberg, chip, Two Finger metho
PENGUJIAN KABEL TEGANGAN TINGGI XLPE DENGAN MENGGUNAKAN TEKNIK AFTER LAYING Abduh, Syamsir
Jurnal Teknik Elektro Vol 4, No 1 (2004)
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Power system equipment must withstand not only the rated voltage which corresponds to thehighest voltage of a particular system but also over-voltages. Accordingly, it is necessary totest high voltage equipment stage and prior to commissioning. The magnitude and type oftest voltage varies with the rated voltage of particular apparatus. The standard methods ofmeasurement of high voltage and the basic techniques for application to all type ofapparatus for alternating voltage, direct voltage, partial discharge (well known as afterlayingtest) are aid down in the relevant application such as XLPE underground cable.Keywords: After Laying, XLPE Cable
MODEL SISTEM CALL CENTER PADA UNIVERSITAS TRISAKTI Zuhdi, Ahmad
Jurnal Teknik Elektro Vol 4, No 1 (2004)
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Abstract

Call center is a common term for telephone-based human-service operation, currently hasbeen integrated with we enabled services. This paper will present, how to develop model foruniversity call center, to improve and fulfill the best services for all it stakeholder. Systemdevelopment begins with web based campus portal, since its complexity of the businessprocess on current system.Keyword: call center, business process analysis, system model.

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