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29,082 Article Results

Characterization of Defect Induced Multilayer Graphene

10.11591/ijece.v7i3.pp1452-1458
Marriatyi Morsin , Suhaila Isaak , Marlia Morsin , Yusmeeraz Yusof
A study of oxygen plasma on multilayer graphene is done with different flow rates. This is to allow a controlled amount of defect fabricated on the graphene. Results from the study showed that the intensity ratio of defect between D peak and G peak was strongly depended on the amount of oxygen flow rate thus affected the 2D band of the spectra. The inter-defect distance LD ≥ 15 nm of each sample indicated that low-defect density was fabricated. The surface roughness of the multilayer graphene also increased and reduced the conductivity of the multilayer graphene.
Volume: 7
Issue: 3
Page: 1452-1458
Publish at: 2017-06-01

A Proposal for Mitigating Fishermen Killing in Indian Sea Borders through Technology – Maritime Boundary Identification Device

10.11591/ijeecs.v6.i3.pp704-710
Abhishek SN , Shriram K Vasudevan , Prashant R Nair , Thangavelu S , Sundaram RMD
The Tamil Nadu – Sri Lanka maritime boundary has been responsible for frequent controversies in the global front, due to fishermen from Rameshwaram and Ramanthapuram districts recklessly straying past Indian waters. Instances of Indian fishermen being captured and killed by the Sri Lankan navy have spun vivid images of violence and human rights violation among the masses. Social activists are desperate for an automatic alarm system to warn the fishermen when they are about to cross the border, and avert a possible impending crisis. The following discussion focuses on the design of an alarm signal system that could alert the fishermen on a periodic basis as they approach closer to the maritime boundary. Installing Global Positioning System (GPS) devices would pose several economic challenges. Instead of the conventional approach of using GPS devices to track location, a transmitter – receiver system exquisitely designed to send signals to the boat would be effective. This system helps in keeping a continuous track of the boats. It provides a reliable solution to alert fishermen before they could inadvertently exceed the boundary. 
Volume: 6
Issue: 3
Page: 704-710
Publish at: 2017-06-01

A Comparative study on Handoff Algorithms for GSM and CDMA Cellular Networks

10.11591/ijece.v7i3.pp1219-1227
S. Neeraja , G. Sasibhushana Rao
The GSM, CDMA cellular systems are most trendy 2G and 3G digital cellular telecommunications systems, which is widely used throughout the world. These systems have many advantages such as high security, higher quality of call transmission over the long distances, low transmitted power, and enhanced capacity with more efficient utilization of the frequency spectrum. With these advantages these cellular systems have attracted more subscribers with more attention in the field of mobile communications. One of the most attractive features of cellular system is handoff which is a continuation of an active call when the mobile is moving from one cell to another without disconnecting the call. Usually, continuous service is achieved by efficiently designed handoff algorithms. So, efficient handoff algorithms are necessary for enhancing the capacity and QoS of cellular system. In this paper, the handoff analysis for GSM, CDMA cellular networks are done under various propagation models. Various handoff algorithms of GSM are described and also a novel received signal strength (RSS) based GSM handoff algorithm with adaptive hysteresis is analyzed. CDMA Soft handoff algorithm is analyzed and effective soft handoff parameters are estimated for better performance. The Comparison of handoff algorithms is studied based on results.
Volume: 7
Issue: 3
Page: 1219-1227
Publish at: 2017-06-01

Image Processing of Panoramic Dental X-Ray for Identifying Proximal Caries

10.12928/telkomnika.v15i2.6856
Jufriadif; Universitas Putra Indonesia YPTK Padang Na'am , Johan; Gunadarma University Harlan , Sarifuddin; Gunadarma University Madenda , Eri Prasetyo; Gunadarma University Wibowo
This study aims to facilitate the identification of proximal caries in the Panoramic Dental X-Ray  image. Twenty-seven X-Ray images of proximal caries were elaborated. The images in digital form were processed using Matlab and Multiple Morphological Gradient. The process produced sharper images and clarifies the edges of the objects in the images. This makes the characteristics of the proximal caries and the caries severity can be identified precisely.
Volume: 15
Issue: 2
Page: 702-708
Publish at: 2017-06-01

Performance Evaluation of Gauss-Markov Mobility Model in Hybrid LTE-VANET Networks

10.12928/telkomnika.v15i2.5913
Doan; Telkom University Perdana , Rendy; Telkom University Munadi , Robby C.; Telkom University Manurung
Vehicular Ad-hoc Network (VANET) developed based on mobile ad-hoc networks (MANET). VANET have different characteristics than MANET, on VANET mobile node (MN) moves faster, topology changes dynamically. The previous research shows that the model of mobility affects to the network performance. In this paper, the Gauss-Markov mobility model used to illustrate the motion of the MN, which illustrates changes of acceleration, speed, location, and direction at any time. This paper enriches the evaluation of the performance of Gauss-Markov mobility model on LTE-VANET hybrid network, by evaluating various network performance metrics, particularly, packet delivery ratio (PDR), throughput, and delay. This research evaluated the Gauss-Markov mobility model and performed with the number of nodes and randomness index (α) that varies by utilizing NS-3 software. The results show that there is a strong correlation between PDR, throughput, and delay with the addition number of MNs. Based on the simulation result, the hybrid LTE-VANET produce better delay compared to pure VANET. The average delay is smaller 40% compared to pure VANET. This simulation also concludes that different value of alpha on Gauss-Markov mobility model does not influence PDR, throughput, and delay.
Volume: 15
Issue: 2
Page: 606-621
Publish at: 2017-06-01

A Customized Reconfiguration Controller with Remote Direct ICAP Access for Dynamically Reconfigurable Platform

10.12928/telkomnika.v15i2.5508
Tze Hon; Universiti Teknologi Malaysia Tan , Chia Yee; Universiti Teknologi Malaysia Ooi , Muhammad Nadzir; Universiti Teknologi Malaysia Marsono
As FPGA dynamic partial reconfiguration getting into mainstream, design of reconfiguration controller becomes an active research. Most of the existing reconfiguration controllers support only the loading of partial bitstream into configuration memory without allowing user to access ICAP directly, which can provide user higher controllability over the reconfigurable device. This paper presents the architecture of a customized reconfiguration controller with remote direct ICAP access. Remote direct ICAP access allows user to configure or readback device internal registers, which offer user higher controllability over the reconfigurable device. Additionally, the proposed reconfiguration controller achieved at least 3.19 Gbps of reconfiguration throughput, which reduces the platform service downtime during dynamic partial reconfiguration. In order to reduce the latency and transmission overhead of remote functional update, partial bitstream is compressed with run-length encoding before transmission.
Volume: 15
Issue: 2
Page: 570-577
Publish at: 2017-06-01

Chaotic Mutation Immune Evolutionary Programming for Voltage Security with the Presence of DGPV

10.11591/ijeecs.v6.i3.pp721-729
Sharifah Azma Syed Mustaffa , Ismail Musirin , Mohd. Murthada Othman , Mohd. Helmi Mansor
Due to environmental concern and certain constraint on building a new power plant, renewable energy particularly distributed generation photovoltaic (DGPV) has becomes one of the promising sources to cater the increasing energy demand of the power system. Furthermore, with appropriate location and sizing, the integration of DGPV to the grid will enhance the voltage stability and reduce the system losses. Hence, this paper proposed a new algorithm for DGPV optimal location and sizing of a transmission system based on minimization of Fast Voltage Stability Index (FVSI) with considering the system constraints. Chaotic Mutation Immune Evolutionary Programming (CMIEP) is developed by integrating the piecewise linear chaotic map (PWLCM) in the mutation process in order to increase the convergence rate of the algorithm. The simulation was applied on the IEEE 30 bus system with a variation of loads on Bus 30. The simulation results are also compared with Evolutionary Programming (EP) and Chaotic Evolutionary Programming (CEP) and it is found that CMIEP performed better in most of the cases.
Volume: 6
Issue: 3
Page: 721-729
Publish at: 2017-06-01

Design of Digital to Analog Voice Data Packet Conversion from Ethernet Protocol using FPGA

10.12928/telkomnika.v15i2.3612
Barlian Henryranu; University of Brawijaya Prasetio , Dahnial; University of Brawijaya Syauqy
This paper describes a system that is designed to be able to receive packet voice signal using the Ethernet protocol in local networks using FPGA which was programmed decode the data packets. The digital data packets are then converted back into analog data that will be used to control another system. The design was implemented as four components consisting of frame starter unit, address matching unit, buffer unit and DAC processing unit. The system was designed on Xilinx development board using ISE design suite and simulated on ISIM. The test results showed that the system response was less than 40 ms. The result also showed that our proposed design only occupies 11% of number of slices and it also requires 5% of total IOBs on Xilinx Spartan 3-E.
Volume: 15
Issue: 2
Page: 646-653
Publish at: 2017-06-01

Design and Performance Analysis of 1.8 GHz Low Noise Amplifier for Wireless Receiver Application

10.11591/ijeecs.v6.i3.pp656-662
A.A Amin , M. S. Islam , A.A.M. Masud , M. N. H. Khan
In present stereo audio system is a most popular audio system for different purposes. Now a day’s stereo system is commonly used in communication and other purposes. Moreover Normalized Least Mean Square (NLMS) based adaptive filtering is an effective filtering process in case of communication and other applications. However adaptive filtering is an adaptive filter process to cancel out the noise from audio signal successfully. Hence the main objective of this paper is to design a NLMS adaptive filter which cancels out the noise from a noisy wave format stereo audio file. Moreover by varying the order of the adaptive filter (such as 8th, 16th, 32th and 64th), the performance of the NMLS adaptive filtered signal with respect to reference and noisy stereo audio signal are analyzed as well.
Volume: 6
Issue: 3
Page: 656-662
Publish at: 2017-06-01

Rhetorical Sentence Classification for Automatic Title Generation in Scientific Article

10.12928/telkomnika.v15i2.4061
Jan Wira Gotama; Institut Teknologi Bandung Putra , Masayu Leylia; Institut Teknologi Bandung Khodra
In this paper, we proposed a work onrhetorical corpus construction andsentence classification model experiment that specifically could be incorporated in automatic paper title generation task for scientific article. Rhetorical classification is treated as sequence labeling. Rhetorical sentence classification model is useful in task which considers document’s discourse structure. We performed experiments using two domains of datasets: computer science (CS dataset), and chemistry (GaN dataset). We evaluated the models using 10-fold-cross validation (0.70-0.79 weighted average F-measure) as well as on-the-run (0.30-0.36 error rate at best). We argued that our models performed best when handled using SMOTE filter for imbalanced data
Volume: 15
Issue: 2
Page: 656-664
Publish at: 2017-06-01

The Humidity Dependence of Pentacene Organic Metal-Oxide- Semiconductor Field Effect Transistor

10.12928/telkomnika.v15i2.5834
Fadliondi; Universitas Muhammadiyah Jakarta Fadliondi , Muhammad Kunta; Tokyo Institute of Technology Biddinika , Shun-ichiro; Tokyo Institute of Technology Ohmi
Metal-oxide-semiconductor field-effect transistors (MOSFET) were fabricated using organic semiconductor pentacene. The humidity dependence of drain current gate voltage (ID-VG) characteristic and drain current drain voltage characteristic (ID-VD) will be explained. Firstly, the thermal oxidation method was used to grow SiO2 gate insulator with thickness of 11 nm. Secondly, the thermal evaporation method was used to form Au source and drain electrodes with thickness of 28 nm. The channel width and length of the transistors were 500 mm and 200 mm, respectively. By the same method, organic semiconductor material pentacene was deposited with thickness of 50 nm at vacuum of 7.8x10-6 Torr. The hole mobility decreased from 0.035 cm2/(Vs) to 0.006 cm2/(Vs), while the threshold voltage increased from 0.5 V to 2.5 V and gate leakage current also increased from 5.8x10-10 A to 3.3x10-9 A when the relative humidity increased from 20% to 70%.
Volume: 15
Issue: 2
Page: 578-583
Publish at: 2017-06-01

Performance Evaluation of Cascaded Multilevel STATCOM using Hardware-in-the-Loop (HiL) Test based on Real-Time Digital Simulator (RTDS)

10.12928/telkomnika.v15i2.6325
Lihua; JinCheng College of Sichuan University Li , Lin; State Grid Sichuan Electric Power Research Institute Xu , Yang; University of Electronic Science and Technology of China Han
The cascaded H-bridge multilevel converter topology has been increasingly utilized for reactive power compensation purposes for the medium voltage distribution systems. The static synchronous compensators (STATCOMs) or static var generators (SVGs), are difficult to be tested in the field due to the unpredicted network operation conditons. This paper presents an effective method to test the STATCOM/SVG controllers based on the real-time digital simulator (RTDS), which has the benefit of easy implementation, low cost, online parameter tuning and high efficiency. The experimental results of STATCOM/SVG under steady state and dynamic conditions are presented to verify the proposed approach, which can be widely applied in other grid-interfaced power electronic converters and smart grid applications.
Volume: 15
Issue: 2
Page: 549-553
Publish at: 2017-06-01

Determining Electrical Properties of Different Type of Mineral Oil Mixtures

10.11591/ijeecs.v6.i3.pp544-552
Muhammad bin Yahya , Alan Jaynoe Caeser anak Tening
This paper is written to show comparison between the naphthenic mineral oil with namely olive oil and sunflower oil in the context of voltage breakdown as insulating transformer oil. Olive oil is known to have been tested as alternative oil for transformer insulation and sunflower oil is a new oil being tested in this paper. The oils are mixed within certain ratios in order to determine the withstand breakdown voltages. The relationship of the breakdown voltages are also tied with the viscosity of the mixtures, and the mixture of oils are also exposed to ageing test and of tan-delta balancing test. All test follow IEC60156 standard test procedure for liquid insulation test. The mixtures were compared to the existing mineral oils and the findings will be discussed.
Volume: 6
Issue: 3
Page: 544-552
Publish at: 2017-06-01

Conceptual Model of Knowledge Management and Social Media to Support Learning Process in Higher Education Institution

10.12928/telkomnika.v15i2.3491
Tanty; Bina Nusantara University Oktavia , Harco Leslie Hendric Spits; Bina Nusantara University Warnars , Suroto; Bina Nusantara University Adi
Nowadays social media has tremendously transformed organizational business process of institution. Higher Education as a place with the majority generation Y, that advances to use technology should realize these situations. With this social media platform, institution may facilitate the knowledge transfer process, then to support collaborative learning from e-learning to social learning. Referring to this phenomenon, this research will design the integration of concepts of knowledge management and social media as a framework to identify the significant components and its relationship to support each other. In this research, we use a systematic literature review from journal and text book to construct this collaboration model. The outcome of this study is collaboration model of knowledge management and social media to support learning process in higher education institution.
Volume: 15
Issue: 2
Page: 678-685
Publish at: 2017-06-01

System Dynamic Approach for Long-Term Solar Thermal Installed Capacity for Malaysian Industries

10.11591/ijeecs.v6.i3.pp572-582
Anis Sabirin Baharom , Nofri Yenita Dahlan
This paper presents a novel System Dynamics model for solar thermal installed capacity for Malaysian Industries. The objective of this paper is to foresee the influences of technical acceptance and willingness of the Malaysian industries to install the solar thermal system to replace the current system for heating process. Results revealed the Malaysian industries interest level on solar thermal is low. Therefore to increase the interest, Malaysian industries need more booster supports from the government to increase the investment in new technology, which will advantage the company and Malaysia in long-term. Not only industries, the policy makers will also benefit from the outcome, to tailor the framework for solar thermal in developing the solar thermal policy for industries in Malaysia.
Volume: 6
Issue: 3
Page: 572-582
Publish at: 2017-06-01
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