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Computer Science & IT Electrical & Electronics Engineering

Proceeding of the Electrical Engineering Computer Science and Informatics publishes papers of the "International Conference on Electrical Engineering Computer Science and Informatics (EECSI)" Series in high technical standard. The Proceeding is aimed to bring researchers, academicians, scientists, students, engineers and practitioners together to participate and present their latest research finding, developments and applications related to the various aspects of electrical, electronics, power electronics, instrumentation, control, computer & telecommunication engineering, signal processing, soft computing, computer science and informatics.

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Articles 719 Documents

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Improving Recommender System Based on Itemâ€™s Structural Information in Affinity Network Maâ€™arif, Muhammad Rifqi; Mulyanto, Agus
Proceeding of the Electrical Engineering Computer Science and Informatics Vol 1: EECSI 2014
Publisher : IAES Indonesia Section

This paper proposes a technique to improve the accuracy of recommender system result which employ collaborative filtering technique. The proposed method incorporates structural equivalence score of items in affinity network into collaborative filtering technique. Structural equivalence is one of important concept in social network analysis which captures the similarity of items regarding their structural position on the affinity network. Nowadays, various concepts within social network analysis are widely use in many domains to provide better analytical framework. In this paper, we will use structural equivalence of items to enhance the calculation of items similarity as a part of collaborative filtering method. We tested our approach on Netflix database. Then, based on our results we can conclude that considering the structural information of item in affinity network is indeed beneficial.

Location Based Service for Information Publication Using GPS on Android-Based Mobile Phone Okilas, Ahmad Fali; Siswanti, Sri Desy; Rachman, M. Dieka
Proceeding of the Electrical Engineering Computer Science and Informatics Vol 1: EECSI 2014
Publisher : IAES Indonesia Section

The increasing development of mobile technology makes some technology capable to running on multiple mobile platforms. One of them is Location Based Service. Location Based Service is a service provided by the position of the user. One of the utilization of Location Based Service technology is a publication of public information. This information may include important information such as hotels, gas stations, ATMs, and Event. Location Based Service is very dependent on the user's position, therefore, the accuracy of component positioning should be accurate enough. By default configurations android GPS accuracy is not very good, needed tweaking to minimize errors in accuracy. To measure the accuracy shift used haversine formula. Haversine formula is a method to measure the distance between two points on the sphere based on its latitude and longitude. Based on test results without tweaking the maximum accuracy shift is 30 meters while with tweaking only 11 meters. Average accuracy shift without tweaking is 18 meters down to 8 meters using tweaking. Thus the process of tweaking can improve the accuracy of GPS.

OSRR-based BPF with Square Groundplane Window Safitri, Risma; Munir, Achmad
Proceeding of the Electrical Engineering Computer Science and Informatics Vol 1: EECSI 2014
Publisher : IAES Indonesia Section

In this paper, a bandpass filter (BPF) composedof open split-ring resonator (OSRR) structure with squaregroundplane windows underneath the structure is investigatednumerically and experimentally. Square groundplane windowsare proposed to enhance the property of OSRR-based BPF inovercoming the passband bandwidth response. The designed BPFis constructed of 3 cascaded OSRRs connected with microstriplines. Some parametrical study to obtain the optimum bandwidthresponse is carried out by changing the dimension of squaregroundplane window in the design process. The filter is thendeployed on a 0.8mm thick FR4 Epoxy dielectric substrate withthe dimension of 60mm in length and 20mm in width. Fromthe experimental characterization, the realized OSRR-based BPFwith the dimension of each square groundplane window of 12mmÃ— 12mm shows the bandwidth response of 0.81GHz ranges from1.75GHz 2.56GHz which is comparable with the numerical one.

3D-FDTD Method for Analysis of Rectangular Waveguide Loaded with Anisotropic Dielectric Material Randa, Maulana; Munir, Achmad
Proceeding of the Electrical Engineering Computer Science and Informatics Vol 1: EECSI 2014
Publisher : IAES Indonesia Section

One of the most popular techniques to solve electromagneticproblems numerically is using finite-difference timedomain(FDTD) method. The method has been successfullyapplied to an extremely wide variety of electromagnetic problems.The essential reason resides in the fact that the FDTD methoditself is extremely simple even for analyzing in a three-dimensional(3D) system. In this paper, the analysis of resonant frequencyfor a rectangular waveguide which is loaded with anisotropicdielectric material is numerically investigated based on 3D-FDTDmethod. The wave equations and modes that appear in thewaveguide are analyzed theoretically in which the results areapplied to validate the numerical result obtained from 3D-FDTDmethod. For comparison, an empty rectangular waveguide anda rectangular waveguide fully loaded with isotropic dielectricmaterial are also analyzed both theoretically and numerically.From the result, it shows that a good agreement has been achievedbetween theoretical calculation and 3D-FDTD numerical resultswith their discrepancies of 0.26â€“2.32%.

Radiator for Wireless Charging Application Based on Electromagnetic Coupling Resonant Dessy Eka Rahayu, Ni Wayan; Munir, Achmad
Proceeding of the Electrical Engineering Computer Science and Informatics Vol 1: EECSI 2014
Publisher : IAES Indonesia Section

This paper presents the design and characterizationof radiator for wireless charging application. The radiator isdesigned based on electromagnetic coupling resonant using amicrostrip patch in spiral shape to work at operating frequencyaround 10MHz with the dimension of patch deployment of 50mmÃ— 60mm. The design process includes characterizations of variedpatch length and of gap separation between 2 stacked radiators toachieve the optimum performance. After obtaining the optimumdesign, the radiator is deployed on a side of FR4 Epoxy dielectricsubstrate with the thickness of 0.8mm, whilst the other sideis applied for a groundplane. The realized radiator is thenmeasured experimentally to obtain its characteristic responsesto be compared with the design results. From numerical characterization,the radiator works at operating frequency of 10MHzwith S11 value of -29.79dB and S21 value of -1.62dB. Whilstfrom experimental characterization, the operating frequency offabricated radiator is 9.21MHz with values of S11 and S21 of-20.22dB and -2.72dB, respectively.

Characterization of Capacitor-based Reconfigurable Frequency Selective Surfaces Munir, Achmad; Jauhari, Arif
Proceeding of the Electrical Engineering Computer Science and Informatics Vol 1: EECSI 2014
Publisher : IAES Indonesia Section

In this paper, the characterization of reconfigurablefrequency selective surfaces (FSS) based on capacitoris numerically investigated. The capacitor is applied to controlthe characteristic response, i.e. reflectivity, of FSS. A simplerectangular patch with the total length of 130mm and thewidth of 0.6mm which has 2 resonant frequencies at 2.4GHzand 4GHz is used as basis of reconfigurable FSS construction.The investigation is conducted by varying the patch shape andthe capacitance value. The relationship of patch shape and thepresence of capacitor to the characteristic response of FSS isanalyzed, first, by proposing the initial construction which isdivided into 2 identical parts. Secondly, the variation of up andbottom width of patch without modifying the center side, so theconstruction becomes a bow-tie shape, is carried out. In the last, acapacitor is applied in the middle of patch to obtain the variationof characteristic response. From the characterization result, itshows that the higher capacitance value affects to the reflectivityof lower frequency response.

Compact Circularly Spiral Planar Inverted-F Antenna for Medical Implant Application Harish, Argya; Munir, Achmad
Proceeding of the Electrical Engineering Computer Science and Informatics Vol 1: EECSI 2014
Publisher : IAES Indonesia Section

A combination technique to reduce the physicaldimension of device to be more compact is proposed in this paperto design an antenna for medical implant application. Two designtechniques, i.e. planar inverted-F and geometry modification, arecombined and implemented to construct a compact circularlyspiral planar inverted-F antenna (PIFA) to operate aroundfrequency of 920MHz. The antenna is deployed on an FR4Epoxy dielectric substrate with the thickness of 0.8mm. Before thehardware realization, the parameters of antenna including reflectioncoefficient, voltage standing wave ratio (VSWR), gain, andradiation pattern as well as its physical dimension are investigatednumerically to obtain the optimum performance design. Fromexperimental characterization, it shows that the realized antennain circular shape which has the diameter of 18mm resonatesat frequency of 911MHz with measured bandwidth and gain of20MHz and -29.82dBi, respectively.

Ultra Wideband Noise Channel Measurement using a Vector Network Analyzer Alshabo, Ahmed; James Vial, Peter; Ros, Montserrat; Stirling, David; Abu Bakar Sidik, Muhammad
Proceeding of the Electrical Engineering Computer Science and Informatics Vol 1: EECSI 2014
Publisher : IAES Indonesia Section

In this paper, we analyze the measurement of ultra wideband (UWB) noise channels in different indoor environments. All measurements are done using a vector network analyzer (VNA) which allows us to measure the noise channel transfer functions. We find that the noise power of the system is decreased by increasing the intermediate frequency (IF) bandwidth which leads to an increase in time taken to perform measurements of the channels. Also, we measure the environmental noise power and find that it is slightly affected by fluorescent light sources inside the measurement environments. In addition, we find that the environmental noise is decreased when enclosed in a Faraday cage (steel shed), within an intense multipath measurement environment. As secondary application, we show how a frequency detection device can be used to re-adjust a maladjusted frequency selection on a remote controller for a garage door, in presence of environmental noise power.

An Efficient Cluster-based Routing Protocol for Mobile Ad Hoc Networks Hakimifar, Fatemeh; Amin Hosseini-Seno, Seyed; Shenify and Rahmat Budiarto, Mohamed
Proceeding of the Electrical Engineering Computer Science and Informatics Vol 1: EECSI 2014
Publisher : IAES Indonesia Section

Clustering algorithm used in CBRP is a variation of simple lowest-ID clustering algorithm in which the node with a lowest ID among its neighbors is elected as the Cluster-head. Neglecting mobility and energy for selecting cluster-head is one of the weakness points of this protocol. In this paper the cluster formation algorithm is introduced, that uses the relative mobility metric, the residual energy and connectivity degree. After forming the cluster, whenever the cluster-head's energy is less than the aggregate energy of its member nodes, it remains as the cluster-head. Using NS-2 we evaluate rate of cluster-head changes, normalization routing overhead and packet delivery ratio. Comparisons denote that the proposed CBRP has better performances with respect to the original CBRP and Cross-CBRP.

Switched Beam Smart Antenna for Wireless Local Area Network ., Evizal; Listia Rosa, Sri; Supriyanto, Eko; Abd Rahman, Tharek; Kamal Abdul Rahim, Sharul; Moradikordalivand, Ali
Proceeding of the Electrical Engineering Computer Science and Informatics Vol 1: EECSI 2014
Publisher : IAES Indonesia Section

In wireless communication system, interference is one of the issue facing that can disturb in communicating between base station and mobile devices. This paper propose switched beam smart antenna system, an octagonal configuration of directional antenna is introduced and selecting beam to desire user. Each beam of antenna covered 45 degrees; by assembly of all directional antennas to create an omni-directional configuration with coverage all the beam 360 degrees. To control of the beam switching, an inexpensive microcontroller PIC 16F877 from microchip used, radio signal strength of mobile device receive as reference signal and compare to each of beam, the highest signal received is selected than microcontroller will lock to the desire beam. A few samples of received signal strength to be analysis by an algorithm to avoid multiple signals and select actual signal strength received. In this experiment 2.45 GHz ISM band used for the transmitter and receiver and testing have been conducted in outdoor environment. Results shows that switched beam smart antenna working fine base on mobile device location and able to switch the beam while mobile device is moving.

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