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27,404 Article Results

Power Characteristics of Wireless Charging for Sensor Networks in Tunnels

10.12928/telkomnika.v13i4.3105
Xiaoming; China University of Mining and Technology Liu , Enjie; China University of Mining and Technology Ding , Duan; China University of Mining and Technology Zhao , Youfang; China University of Mining and Technology Yang
In order to generate wireless microwave power charging technology in coal mine tunnels, it is necessary to know the power characteristics of wireless electromagnetic wave along the tunnel walls. In this paper, the experimental results of narrowband wireless electromagnetic wave propagation measurements are presented, and a statistical model of the power characteristics at 2.4 GHz in real rectangular mine tunnels is proposed. Two standard half-wave dipole antennas were used to perform the field experiments in tunnels with different wall materials. A 10-meter wireless charging distance belongs to the free-space propagation zone. The path loss exponents rely heavily on the location of the receiver and antenna polarizations. To obtain more power, the locations of the receiver should match the corresponding polarizations.
Volume: 13
Issue: 4
Page: 1180-1186
Publish at: 2015-12-01

Power Transformer Incipient Faults Diagnosis Based on Dissolved Gas Analysis

10.11591/ijeecs.v16.i3.pp409-416
Osama E. Gouda , Saber M. Saleh , Salah Hamdy EL-Hoshy
Incipient fault diagnosis of a power transformer is greatly influenced by the condition assessment of its insulation system oil and/or paper insulation. Dissolved gas-in-oil analysis (DGA) is one of the most powerfull techniques for the detection of incipient fault condition within oil-immersed transformers. The transformer data has been analyzed using key gases, Doernenburg, Roger, IEC and Duval triangle techniques. This paper introduce a MATLAB program to help in unification DGA interpretation techniques to investigate the accuracy of these techniques in interpreting the transformer condition and to provide the best suggestion for the type of the fault within the transformer based on fault percentage. It proposes a proper maintenance action based on DGA results which is useful for planning an appropriate maintenance strategy to keep the power transformer in acceptable condition. The evaluation is carried out on DGA data obtained from 352 oil samples has been summarized into 46 samples that have been collected from a 38 different transformers of different rating and different life span.
Volume: 16
Issue: 3
Page: 409-416
Publish at: 2015-12-01

Evaluation of the Modernization of Hydraulic Projects Management Compact-Center-Point Triangular Whitenization Weight Function

10.12928/telkomnika.v13i4.2805
Li; Hohai University Lijie , Wang; Hohai University Xiao , Zhang; Hohai University Lina
In the actual analysis of grey clustering evaluation, it has been found that the length of the grey clustering interval is partially larger, which is determined by the method of grey clustering evaluation based on the center-point triangular whitenization weight function. In order to solve this problem, a new grey evaluation method based on reformative triangular whitenization weight function is researched. The existing end-point triangular whitenization weight function and center-point triangular whitenization weight function are revised, and a new compact-center-point triangular whitenization weight function is constructed. Then the rules for grey category intervalof the three triangular whitenization weight functions are compared, and an example about the evaluation of the modernization of hydraulic projects management is proposed for analyzing the three methods to further verify that the improved grey clustering evaluation method based on the compact-center-point triangular whitenization weight function is feasible and effective. The results show that the compact-center-point triangular whitenization weight function is superior to both the end-point triangular whitenization weight function and the center-point triangular whitenization weight function.
Volume: 13
Issue: 4
Page: 1478-1485
Publish at: 2015-12-01

Layer Recurrent Neural Network based Power System Load Forecasting

10.11591/ijeecs.v16.i3.pp423-430
Nikita Mittal , Akash Saxena
This paper presents a straight forward application of Layer Recurrent Neural Network (LRNN) to predict the load of a large distribution network. Short term load forecasting provides important information about the system’s load pattern, which is a premier requirement in planning periodical operations and facility expansion. Approximation of data patterns for forecasting is not an easy task to perform. In past, various approaches have been applied for forecasting. In this work application of LRNN is explored. The results of proposed architecture are compared with other conventional topologies of neural networks on the basis of Root Mean Square of Error (RMSE), Mean Absolute Percentage Error (MAPE) and Mean Absolute Error (MAE). It is observed that the results obtained from LRNN are comparatively more significant.
Volume: 16
Issue: 3
Page: 423-430
Publish at: 2015-12-01

Image Encryption using Simple Algorithm on FPGA

10.12928/telkomnika.v13i4.1787
Barlian Henryranu; University of Brawijaya Prasetio , Eko; University of Brawijaya Setiawan , Adharul; University of Brawijaya Muttaqin
Data security becomes one of the things that need to be considered. The Sum of Product (SOP) Encryption is one of simple algorithm. The SOP encryption is not a public-key system to encrypt data. it is almost unbreakable through brute force method and vulnerable to attack because the encryption models have a fixed pattern. However, this drawback can be avoided through the compression process to remove the pattern file. SOP encryption algorithm can use a Boolean algebra combination functions such as AND gate and OR gate. Simple algorithm in hardware language VHSIC Hardware Description Language (VHDL) is on data bits level. The purpose of this research is implementation of image encryption algorithm to produce a quick image encryption system. From result test, the image processing time without encryption average 4.999ns/px and 13.51ns/px with encryption.
Volume: 13
Issue: 4
Page: 1153-1161
Publish at: 2015-12-01

Classification of Non-Functional Requirements Using Semantic-FSKNN Based ISO/IEC 9126

10.12928/telkomnika.v13i4.2300
Denni Aldi; Dian Nuswantoro University Ramadhani , Siti; Institut Teknologi Sepuluh Nopember Rochimah , Umi Laili; Institut Teknologi Sepuluh Nopember Yuhana
Non-functional requirements is one of the important factors that play a role in the success of software development that is often overlooked by developers, so it cause adverse effects. In order to obtain the non-functional requirements, it requires an identification automation system of non-functional requirements. This research proposes an automation system of identification of non-functional requirements from the requirement sentence-based classification algorithms of FSKNN with the addition of semantic factors such as the term development by hipernim and measurement of semantic relatedness between the term and every category of quality aspects based ISO / IEC 9126. In the test, the dataset is 1342 sentences from six different datasets. The result of this research is that the Semantic-FSKNN method can reduce the value of hamming loss or error rate by 21.9%, and also raise the value of accuracy by 43.7%, and also the precision value amounted to 73.9% compared to FSKNN method without the addition of semantic factors in it.
Volume: 13
Issue: 4
Page: 1456-1465
Publish at: 2015-12-01

Image Denoising Based on K-means Singular Value Decomposition

10.12928/telkomnika.v13i4.1897
Jian; Hunan University of International Economics Ren , Hua; Hunan University of International Economics Lu , Xiliang; Hunan University of International Economics Zeng
The image is usually polluted by noises in its acquisition and transmission and noises are of great importance in the image quality, therefore, image de-noising has become a significant technique in image analysis and processing. In the image de-noising based on sparse representation, one of the hot spots in recent years, the useful image information has certain structural features, which coincide with the atomic structure while noises don’t have such features, therefore, sparse representation can separate the useful information from the noises effectively so as to achieve the purpose of de-noising. In view of the above-mentioned theoretical basis, this paper proposes an image de-noising algorithm of sparse representation based on K-means Singular Value Decomposition (K-SVD). This method can integrate the construction and optimization of over-complete dictionary, train the atom dictionary with the image samples to be decomposed and effectively build the atom dictionary that reflects various image features to enhance the de-noising performance of the algorithm in this paper. Through simulation analysis, this method can conduct noise filtration on the image with different noise densities and its de-noising effect is also better than other methods.
Volume: 13
Issue: 4
Page: 1312-1318
Publish at: 2015-12-01

High Performance Computing on Cluster and Multicore Architecture

10.12928/telkomnika.v13i4.2156
Ahmad; Universitas Gadjah Mada Ashari , Mardhani; Universitas Gadjah Mada Riasetiawan
High Performance Computing have several issues on architecture, resources, computational model and data. The challenge is establishing the mature architecture with scalable resources. The cluster architecture and multicore architecture implement to produce high performance on computation and process. This research works on architecture development and performance analysis. The cluster architecture build on Raspberry Pi, a single board computer, implement MPICH2. Raspberry Pi cluster build on Raspbian Wheezy operating system and test by metrics computation applications. The multicore architecture build on single computer with Core i5 and Core i7 architecture. The research use himeno98 and himeno16Large tools to analysis the processor and memory allocation. The test run on 1000x1000 matrices and benchmarked with OpenMP. The analysis focuses on CPU Time, FLOPS, and score. The result show on cluster architecture have 2576,07 sec in CPU Time, 86,96 MLPOS, and 2,69 score. The result on Core i5 architecture have 55,57 sec in CPU time, 76,30 MLOPS, and 0,92 score. The result in Core i7 architecture have 59,56 sec CPU Time, 1427,61 MLOPS, and 17,23 score. The cluster and multicore architecture results show that computing process are effected by architecture models. High performance computing architecture that has been built on this result can give learn on the development of HPC architecture models, and baseline performance. In the future it will use for determine the delivery architecture model on HPC and can be test by more variation of load.
Volume: 13
Issue: 4
Page: 1408-1413
Publish at: 2015-12-01

Conventional DC Voltage Operating System for High Speeed Traction Power Supplies Using LLC-HPQC Control

10.11591/ijai.v4.i4.pp118-128
Ch. Lenin Babu , P. Harinath Reddy , T. Reddi Sekhar
In this paper a hybrid power quality compensator (HPQC) is proposed for compensation in cophase traction power supply and minimum dc operation voltage is achievable for high-speed traction power supply. The parameter design procedure for minimum dc operation voltage in HPQC as well as minimum voltage rating with load PF is discussed. The detailed discussions of proposed circuit configurations of HPQC are provided in section II, together with comparison with conventional RPC. In comparison with conventional railway power compensator proposed HPQC can achieve reduced dc link voltage level. It is also verified through simulations results that the LLC-HPQC would operate at the minimum voltage with the proposed parameter design. HPQC is able to provide system unbalances, reactive power, and harmonic compensation in cophase traction power with reduced operation voltage. The cophase traction power supply with proposed HPQC is suitable for high-speed traction applications.
Volume: 4
Issue: 4
Page: 118-128
Publish at: 2015-12-01

Automatically generation and evaluation of Stop words list for Chinese Patents

10.12928/telkomnika.v13i4.2389
Deng; Hubei University of Technology Na , Chen; Zhongnan University of Economics and Law Xu
As an important preprocessing step of information retrieval and information processing, the accuracy of stop words’ elimination directly influences the ultimate result of retrieval and mining. In information retrieval, stop words’ elimination can compress the storage space of index, and in text mining, it can reduce the dimension of vector space enormously, save the storage space of vector space and speed up the calculation. However, Chinese patents are a kind of legal documents containing technical information, and the general Chinese stop words list is not applicable for them. This paper advances two methodologies for Chinese patents. One is based on word frequency and the other on statistics. Through experiments on real patents data, these two methodologies’ accuracy are compared under several corpuses with different scale, and also compared with general stop list. The experiment result indicates that both of these two methodologies can extract the stop words suitable for Chinese patents and the accuracy of Methodology based on statistics is a little higher than the one based on word frequency.
Volume: 13
Issue: 4
Page: 1414-1421
Publish at: 2015-12-01

Knowledge and Behaviour about Adolescent Reproductive Health in Yogyakarta, Indonesia

10.11591/ijphs.v4i4.4754
Solikhah Solikhah , Sitti Nurdjannah
Lack of knowledge about reproductive health in adolescent, making teens easily influenced by misinformation and harmful to their reproductive health. Health education plays an important role in increasing their knowledge and behavior of young people in order to maintain good reproductive health.  The purpose of the research was to see the impact of health education on the knowledge and behavior of adolescents in reproductive health. Paired t test analysis results indicate that counseling on reproductive health effect on both knowledge about reproductive health (mean difference: 10.216, 95% CI: 6.622 to 13.809) and attitudes about reproductive health in adolescents (mean difference: 65.417, 95% CI: 11,176 to 61.690). Knowledge of adolescents about reproductive health would be beneficial in preparing the young people in good reproductive health issues so expect teenagers do not conflict with the norms prevailing in the community.
Volume: 4
Issue: 4
Page: 326-331
Publish at: 2015-12-01

A Case Report of Marfan Syndrome with Literature Review

10.11591/ijphs.v4i4.4745
Hemanth Kumar Kalla , Swarna Kumari , CH Rama Rao , MKR Parthasarathy , S Surya Prakash Reddy , M Revathi
Marfan syndrome(MFS) is a connective tissue disorder that affects multiple organ systems. Cardiovascular, ocular, and skeletal abnormalities are cardinal features of the syndrome. Its incidence is among the highest of any heritable disorder.Most patients who have Marfan syndrome are usually diagnosed incidentally when they present for a routine physical examination for various reasons. The purpose of this paper is to provide a review of the literature, as well as describe a 22-year-old male with MFS and right hydroureteronephrosis diagnosed incidentally when he attended our hospital for complaints of fever and right loin pain. This case report emphasizes importance of “Revised Ghent criteria” for the diagnosis of MFS and highlights various clinical signs of MFS.
Volume: 4
Issue: 4
Page: 269-274
Publish at: 2015-12-01

Double Burden of Malnutrition among Undergraduates in Ogun State Nigeria

10.11591/ijphs.v4i4.4752
Catherine Adebukola Oladoyinbo , Nkereuwem N Ekerette
Coexistence of under and over nutrition among the same population group is referred to as the double burden of malnutrition. The objective of this study was to assess double burden of malnutrition among undergraduate students in Ogun State Nigeria. A cross-sectional study involving 1,115 (37.8%) males and 1,835 (62.2%) females was conducted.  Body mass index (BMI) was derived from weight and a height measurement, waist circumference (WC) measurement was taken to assess abdominal obesity. SPSS version 16 was used for data analysis. Mean age, height, weight and BMI were 23±0.05years, 1.63±0.001m, 60.99±0.22kg and 22.80±0.08kgm respectively. Mean WC was 82.21±0.32cm and 80.55±0.49cm among males and females respectively. Based on BMI, the Prevalence of underweight, overweight and obesity were 13.4%, 16.9% and 7.5% respectively. BMI did not relate significantly with both age (p=0.464) and gender (P=0.115). About fifty percent (50.64%) of females and 12.36% males who were overweight and obese also had excess abdominal fat. Prevalence of abdominal obesity was significantly higher among females (16.9%) than males (2.5%), (p=0.001). Respondents in this study were faced with problems of both under-nutrition and over-nutrition.
Volume: 4
Issue: 4
Page: 315-319
Publish at: 2015-12-01

A Review of The Anti-diabetic Activity of Andrographis paniculata (Burm. f.) Nees based in-vivo Study

10.11591/ijphs.v4i4.4743
Titi Komalasari , Sabtanti Harimurti
Diabetes mellitus (DM) is ricing nowadays. DM is a metabolic deasease characterized by increasing of glucose blood level for prolonged time. Patient with DM must take medicine for lowering glucose levels in whole life. Synthetic anti-diabetic agent is commonly used and significantly able to maintain the glucose blood levels. However, many side effects will occur during the treatment. Further, people is trying to find an alternative medicine for DM treatment. This paper will discuss about an alternative medicine for anti-diabetic agent that is called Andrographis paniculata (Burm. f.) Nees based in-vivo study. Search data obtained from PubMed, PMC (PubMed Central), International Food and Research Journal, and Google search engine. Inclution and exclution criteria were used for selection of journals. Inclution criteria were taken is in-vivo study of Andrographis paniculata as anti-diabetic, published in 2000-2014, and free full text journal or PubReader (full text journal in PubMed Central) in English or Indonesian language. Base on reviewed journals that was conducted, anti-diabetic agent of Andrographis paniculata was found in extract, in fractional coumpund (i.e. andrographolide or its analogue AL-1: andrographolide-lipoic acid), and in combination with synthetic drug or other herbal. Therefore, Andrographis paniculata is potentially developed as an alternative anti-diabetic agent.
Volume: 4
Issue: 4
Page: 256-263
Publish at: 2015-12-01

Stroke Treatment Cost Analysis for Consideration on Health Cost Determination Using INA- CBGs at Jogja Hospital

10.11591/ijphs.v4i4.4748
Ingenida Hadning , Zullies Ikawati , Tri Murti Andayani
Indonesian Case Based Groups (INA-CBGs) implementation on hospital financing for stroke patient using Jaminan Kesehatan Masyarakat (Jamkesmas) at 3rd class hospitalization requires therapy plan management and cost analysis because stroke is a leading cause of death worldwide and need high treatment cost. It is purposed to skimp the hospital expenditure and avoid deficit suffering. The study objectives was to determine the suitability cost between real stroke treatment cost and health financing based on INA-CBGs, and to determine the highest cost component on stroke treatment at Jogja hospital. This cross sectional observational study used retrospective sampling method. The subjects were taken from all stroke patient population using Jamkesmas insurance at Jogja Hospital, were hospitalized between January 2011-April 2012 and met the inclusion criteria. The subject was then classified based on INA-CBGs. Patient’s length of stay and costs (direct medical and direct non-medical costs) were defined as study variable. Data was analysed using descriptive analysis and Mann Whitney test. Throuh this study we conclude the average rate of real stroke treatment cost at Jogja Hospital was higher insignificantly than INA-CBGs based cost and the highest treatment cost was on the medicine and medical equipment.
Volume: 4
Issue: 4
Page: 288-293
Publish at: 2015-12-01
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