Article Per Year (5 Year)
p-Index From 2019 - 2024
0.23
P-Index
This Author published in this journals
All Journal Techno (Jurnal Fakultas Teknik, Universitas Muhammadiyah Purwokerto) Semesta Teknika Jurnal Ilmiah Dinamika Rekayasa (DINAREK) Indonesian Journal of Community Services Makara Journal of Technology Techno Jurnal Rekayasa elektrika Jurnal INFOTEL
Hesti Susilawati
Program Studi Teknik Elektro, Fakultas Sains Dan Teknik, Universitas Jenderal Soedirman, Purwokerto 53122
Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences

Published : 14 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 14 Documents
Search

 1   2 
RANCANG BANGUN DAN ANALISIS SECTORAL ANTENNA RADIASI SEMICIRCULAR FREKUENSI 2.4GHz UNTUK APLIKASI IEEE 802.11b/g Susilawati, Hesti
Techno Jurnal Ilmu Teknik Vol 13, No 1 (2012): Jurnal Techno April 2012
Publisher : UMP

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Sectoral antenna is a widely used antenna for wireless communications IEEE 802.11b/g  or Wi-Fi due to its large gain and ability to determine covered area.  In this research, a sectoral antenna 2.4GHz frequency with semicircular radiation for IEEE 802.11b/g applications was designed and built.  Design and simulation is done by 4NEC2 software.  In order to get a better performance, the  design was firstly optimized. Antenna parameters studied in this research are Gain, Radiation Pattern H-plane and E-plane, Directivity, Efficiency, and VSWR. Result shown that the simulated performance of sectoral antennaafter optimizationare 13.27 dBi Gain, 120 ° H-plane beamwidth,  10 ° E-plane beamwidth, 15.36 dB Directivity, 95.95% Efficiency, and 1.37 VSWR. While real performance testing of sectoral antenna in the field are 13 dBi Gain, 125 ° H-plane beamwidth, 15 ° E-plane beamwidth, 13.42 dB Directivity, 90.68% Efficiency, and 1.6 VSWR. There are some differences in performance between simulation and application in practice.  Among the causes are the accuracy of manufacturing, quality of materials used, environmental conditions of measurement process, measurement precision, and accuracy of the instrument used. Overall, a sectoral antenna has been created properly and can be used to accomodate 2.4 GHz frequency communication, namely IEEE 802.11b/g. Keywords: antenna, sectoral, semicircular, IEEE 802.11b/g.
IMPLEMENTASI HTB (HIERARCHICAL TOKEN BUCKET) UNTUK MANAJEMEN BANDWIDTH PADA ROUTER INTERNET DI UNIVERSITAS JENDERAL SOEDIRMAN Asmoro, Dwi Ary; Susilawati, Hesti; Nugraha, Azis Wisnu Widhi
Techno Jurnal Ilmu Teknik Vol 12, No 2 (2011): Jurnal Techno Oktober 2011
Publisher : UMP

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

HTB (Hierarchical Token Bucket) bandwidth management implementation on Jenderal Soedirman University is an improvement from PCQ (Per Connection Queue) bandwidth management. PCQ divide traffic automatically based on active users, its weakness is in dividing a large amount of active users. The HTB impelentation refers to Mikrotik RouterOS queue tree, consists of class and parent that is filled by outgoing-interface. Each parent is adjusted based on IP adress block on each node, and determine packet-mark through IP-firewall-mangle. From the implementation result, 2 Global-total or main parent can be obtained, Unsoed down and Unsoed up. 29 Global-in or parent child down and 29 Global-out or parent child up which each parent max-limit is determined by 17,5 Mbps. The users satisfaction based independent sample t-test give the mean value of HTB browsing is 2,823 and PCQ browsing is 2,79. The mean value of HTB downloading is 2,616 and PCQ downloading is 2,636. Those values show that theres no significant differences in Unsoed internet users satisfaction.Keywords : Implementation of bandwidth, Mikrotik RouterOS, queue, parent. 
Sistem Pendeteksian Kerusakan Mesin Sepeda Motor 4-Langkah Berbasis Suara Menggunakan Support Vector Machine (SVM) et.al, Hesti Susilawati ,
Jurnal Semesta Teknika Vol 14, No 1 (2011): MEI 2011
Publisher : Jurnal Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Detection process early towards motorcycle engine condition will be important matter especially for common user motorcycle. This detection can be used to estimate motorcycle engine condition (normal or damage), damage kind, how big damage influence towards motorcycle continuance, motorcycle duration can survive with damage and cost estimate that taked suppose will repair damage. In this research is built 4-stroke motorcycle engine damage detection system based on voice uses Support Vector Machine (SVM) multi class. In system that proposed, motorcycle engine voice is recorded and then cultivated so that produce feature shaped coefficient Linear Predictive Coding (LPC). Coefficient LPC that extracted from this motorcycle engine voice then become an input for SVM. Furthermore SVM will determine motorcycle engine condition. Engine condition detection system based on SVM this meant to detect three engine conditions that is normal condition, damage cham chain and damage ignition system. System applications that proposed show that motorcycle engine condition detection system based on voice uses SVM has good accuracy that is 100%.
Simulasi Cell Breathing CDMA 2000 1x Menggunakan DELPHI Perdana, Ilham; Hikmaturokhman, Alfin; Susilawati, Hesti
Jurnal Semesta Teknika Vol 10, No 1 (2007): MEI 2007
Publisher : Jurnal Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Cell breathing is variation of CDMA cell size depends upon the amount of traffic occurs within the cell. This work assume that the cell is in the ideal condition based on  the following assumptions,  each cell is completely isolated from the other cells, with the result that no intercell interference and signals from MS cause no interference within the cell. It makes no intracell interference occurs within the cell. In an ideal condition where is none of interference occurs, cell size and amount of users in a cell depend on several factors such as bitrate, required signal strength that MS must deliver to BS, voice activity factor, power control accuracy factor and Eb/It of the system. The result obtained by change the values of the parameters and based on the result obtained, the impact of the parameter to the cell size and amount of user in a cell could be recognized.
Penentuan Pembebanan Maksimum Transformator Daya Yang Menyuplai Personal Computer (PC) Prasetijo, Hari; Susilawati, Hesti
Dinamika Rekayasa Vol 5, No 2 (2009): Dinamika Rekayasa - Agustus 2009
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dr.2009.5.2.21

Abstract

Personal computer is electronic equiment that use solid state device, such as rectifiers, so it to be source of harmonic current. Harmonic current is sinusoidal current with multiple frequency of fundamental current which will be increase power losses because increasing effective current and frequency. In electric distribution system, transformer is component with highest power losses. They are consit of DC losses (Pdc) that influence by effective current, eddy current (PEC) and other stray losses (POSL) which influence by effective current and their frequency. This study involved increasing transformer power losses with assume that transformer supply in full load condition to personal computer. Analyzes following IEEE Std. C57.110-1998 with comparing determination maximum transformer loading use current spectrum from spectrum analyzer equipment and conversion produce Mathlab from current wave time domain to current wave frequency domain. The result are maximum transformer loading is 97,84 use spectrum analyzer and 97,84 use Mathlab sofware.
Uji Kelayakan Jaringan Lokal Universitas Jenderal Soedirman Untuk Implementasi VoIP Ridwan, Muhamad; Nugraha, Azis Wisnu Widhi; Susilawati, Hesti
Dinamika Rekayasa Vol 7, No 1 (2011): Dinamika Rekayasa - Februari 2011
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dr.2011.7.1.44

Abstract

UNSOED has LAN connection which covers almost all of its units, with minimum bandwidth consupmtionat anaverage of275,318 Kbpsfrom a total of 3 Mbpsso we may apply VoIP system in order to replace voice communication system whichis still using PSTN and PABX. Thereforewe need to know aboutjitter and packet loss ofLAN,and also the codec needs tobedetermined due to voice quality expected and also bandwidth consumpted. Measurementscarried out in two scenariosbased on topologies used in UNSOED (star and ring), in the first scenario (star and ring)server placed on serverfarm meanwhile the second scenario(ring) server placed on Pertanian node. Codec adjusted to the available bandwidth capacity and total of phone number that has to handled. The result show that 0,759 ms jitter obtained from scenario 1 and 0,513ms from scenario 2, both of them included in good category with 0-20 ms of range value, otherwise 0% of packetloss obtained from both scenarios these indicated that LANincluded in good category. There is iLBCcodec with 30 ms packet size which is the mosteconomic on bandwidthcost among G.729, G.711, and iLBC (20 ms), because it cost1995,84Kbpsof total bandwidth usedforhandling 140 phone number. Beside that, it has good voice quality with 4,138996 MOS value. So if we use iLBC (30 ms) codec on the VoIPsystem, there will be still a lot of free bandwidth which can used for other applications, it is about 695,873 Kbps(worst condition) and also get a good-voice quality-VoIP.
Sistem Pendeteksian Kerusakan Mesin Sepeda Motor 4-Langkah Berbasis Suara Menggunakan Support Vector Machine (SVM) et.al, Hesti Susilawati ,
Semesta Teknika Vol 14, No 1 (2011): MEI 2011
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v14i1.584

Abstract

Detection process early towards motorcycle engine condition will be important matter especially for common user motorcycle. This detection can be used to estimate motorcycle engine condition (normal or damage), damage kind, how big damage influence towards motorcycle continuance, motorcycle duration can survive with damage and cost estimate that taked suppose will repair damage. In this research is built 4-stroke motorcycle engine damage detection system based on voice uses Support Vector Machine (SVM) multi class. In system that proposed, motorcycle engine voice is recorded and then cultivated so that produce feature shaped coefficient Linear Predictive Coding (LPC). Coefficient LPC that extracted from this motorcycle engine voice then become an input for SVM. Furthermore SVM will determine motorcycle engine condition. Engine condition detection system based on SVM this meant to detect three engine conditions that is normal condition, damage cham chain and damage ignition system. System applications that proposed show that motorcycle engine condition detection system based on voice uses SVM has good accuracy that is 100%.
Kelayakan Geosite dan Geomorphosite Kawasan Desa Wisata Limbasari sebagai Potensi Geowisata Desa Limbasari Huzaely Latief Sunan; Widhiatmoko Herry Purnomo; Nur Chasanah; Gito Sugiyanto; Tigar Putri Adhiana; Hesti Susilawati; Rani Aulia Imran; Akhmad Khahlil Gibran; Suroso Suroso; Teguh Cahyono; FX Anjar Tri Laksono
Indonesian Journal of Community Services Vol 2, No 2 (2020): November 2020
Publisher : Universitas Islam Sultan Agung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30659/ijocs.2.2.109-117

Abstract

Desa Limbasari secara geografis terletak di Kecamatan Bobotsari Kabupaten Purbalingga. Desa Limbasari merupakan salah satu desa wisata yang baru di Kabupaten Purbalingga. Desa ini mempunyai potensi yang besar untuk dikembangkan sebagai destinasi wisata dalam segi wisata kebumian dan geoheritage. Daya tarik wisata yang ada berupa River Tubing, landscape pegunungan batuan gunung api yang terdapat batu jasper hijau “nogo sui”, dan situs kebudayaan prasejarah. Di samping itu keunikan budaya serta sejarah masyarakat juga menjadi daya tarik bagi masyarakat perkotaan. Tujuan dari pengabdian masyarakat adalah mengulas kelayakan geosite dan geomorphosite di Desa Limbasari sebagai sebuah solusi bagaimana memanfaatkan kekayaan geologi beserta berbagai dinamikanya untuk kegiatan wisata edukasi dan ekonomi yang berwawasan lingkungan. Metode yang digunakan adalah pemetaan potensi geologi sebagai kawasan wisata, inventarisasi pada lokasi yang mempunyai cagar budaya dan sejarah serta wawancara dengan pihak terkait dan studi literatur. Dari hasil kelayakan di kawasan wisata Limbasari mempunyai nilai kelayakan antara 47.5% - 73.5%. Dengan demikian, Kawasan Desa Wisata Limbasari, Kabupaten Purbalingga layak menjadi objek geowisata dengan aspek penilaian didasarkan pada nilai kuantifikasi berbagai keindahan antara alam dan proses geologi yang mengontrol terbentuknya obyek geowisata tersebut.Limbasari Village is geographically located in Bobotsari Subdistrict, Purbalingga Regency. Limbasari Village is one of the new tourism villages in Purbalingga Regency. This village has great potential to be developed as a tourist destination in terms of earth tourism and geoheritage. The tourist attractions are River Tubing, mountainous volcanic mountain landscape with green jasper stone "nogo sui", and prehistoric cultural sites. In addition, the cultural and historical uniqueness of the community is also an attraction for urban communities. The purpose of this study is to review the potential of Geotourism and geoheritage in the Village of Limbasari as a solution to how to utilize the rich geological and cultural sites along with various dynamics for educational activities that are environmentally friendly education and economy. The method used in this study is the mapping of geological potential as a tourist area, an inventory of locations that have cultural and historical reserves as well as interviews with relevant parties and literature studies. From the results of research in the tourist area Limbasari has a feasibility value between 47.5% - 73.5%. Thus, the Limbasari Tourism Village Area, Purbalingga Regency deserves to be a geotourism object with the assessment aspect based on the quantification value of various beauties between nature and the geological process that controls the formation of the geotourism object.
Static Hand Gesture Recognition of Indonesian Sign Language System Based on Backpropagation Neural Networks Asriani, Farida; Susilawati, Hesti
Makara Journal of Technology Vol. 14, No. 2
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Static Hand Gesture Recognition of Indonesian Sign Language System Based on Backpropagation Neural Networks. The main objective of this research is to perform pattern recognition of static hand gesture in Indonesian sign language. Basically, pattern recognition of static hand gesture in the form of image had three phases include: 1) segmentation of the image that will be recognizable form of the hands and face, 2) feature extraction and 3) pattern classification. In this research, we used images data of 15 classes of words static. Segmentation is performed using HSV with a threshold filter based on skin color. Feature extraction performed with the Haar wavelet decomposition filter to level 2. Classification is done by applying the back propagation system of neural network architecture with 4096 neurons in input layer, 75 neurons in hidden layer and 15 neurons in output layer. The system was tested by using 225 data validation and accuracy achieved was 69%.
IMPLEMENTASI HTB (HIERARCHICAL TOKEN BUCKET) UNTUK MANAJEMEN BANDWIDTH PADA ROUTER INTERNET DI UNIVERSITAS JENDERAL SOEDIRMAN Dwi Ary Asmoro; Hesti Susilawati; Azis Wisnu Widhi Nugraha
Techno (Jurnal Fakultas Teknik, Universitas Muhammadiyah Purwokerto) Vol 12, No 2 (2011): Techno Volume 12 No 2 Oktober 2011
Publisher : Universitas Muhammadiyah Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (286.977 KB) | DOI: 10.30595/techno.v12i2.36

Abstract

HTB (Hierarchical Token Bucket) bandwidth management implementation on Jenderal Soedirman University is an improvement from PCQ (Per Connection Queue) bandwidth management. PCQ divide traffic automatically based on active users, it's weakness is in dividing a large amount of active users. The HTB impelentation refers to Mikrotik RouterOS queue tree, consists of class and parent that is filled by outgoing-interface. Each parent is adjusted based on IP adress block on each node, and determine packet-mark through IP-firewall-mangle. From the implementation result, 2 Global-total or main parent can be obtained, Unsoed down and Unsoed up. 29 Global-in or parent child down and 29 Global-out or parent child up which each parent max-limit is determined by 17,5 Mbps. The users satisfaction based independent sample t-test give the mean value of HTB browsing is 2,823 and PCQ browsing is 2,79. The mean value of HTB downloading is 2,616 and PCQ downloading is 2,636. Those values show that theres no significant differences in Unsoed internet users satisfaction. Keywords : Implementation of bandwidth, Mikrotik RouterOS, queue, parent.
Co-Authors Akhmad Khahlil Gibran Alfin Hikmaturokhman Azis Wisnu Widhi Nugraha Azis Wisnu Widhi Nugraha Baharudin Yudha Permana Dimass Noly Mardhiko Dimass Noly Mardhiko Dwi Ary Asmoro Dwi Ary Asmoro, Dwi Ary Farida Asriani FX Anjar Tri Laksono Gito Sugiyanto Hari Prasetijo Huzaely Latief Sunan Ilham Perdana Muhamad Ridwan Nur Chasanah Rahmat K. Noviandono Rahmat K. Noviandono, Rahmat K. Rani Aulia Imran Shinta Yunita Sari Suroso Suroso Tantiningrum Niken Taufik Faturohman Teguh Cahyono Tigar Putri Adhiana Widhiatmoko H.P. Widhiatmoko Herry Purnomo Widhiatmoko Widhiatmoko Widhiatmoko Widhiatmoko, Widhiatmoko