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25,002 Article Results

Analysis of Unbalance Harmonic Propagation in a Three-phase Power System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4218
Syukri Yunus , Khalid Mohamed Nor
Operation is non-linear in a state of unbalance can cause problems harmonics in the power system. There are two parts over the use of computational time in harmonic load flow, the first in the construction of harmonic admittance matrix and the second is the iteration scheme for solving systems of linear equations. Mechanical completion of the harmonic admittance to the problem can be expressed in this paper, was developed as a harmonic admittance parallel applications, and a direct algorithm to calculate the admittance matrix elements are presented. Here, we show three phase power flow program is broken down into three independent sub problems, namely: network sequence of positive, negative, and zero. Positive sequence network will be solved by using the method of Fast decouple without modifying their formulation. Negative and zero sequence networks solved using nodal voltage equation. All three networks have been modeled by a sequence of three independent circuits and solved simultaneously using multi-core processors in parallel programming. DOI:  http://dx.doi.org/10.11591/telkomnika.v13i3.7093 
Volume: 13
Issue: 3
Page: 399-409
Publish at: 2015-03-01

Design and Simulation of Quadrature Phase Detection in Electrical Capacitance Volume Tomography

10.12928/telkomnika.v13i1.1299
Imamul; CTECH Labs Edwar Technology Muttakin , Arbai; CTECH Labs Edwar Technology Yusuf , Rohmadi; CTECH Labs Edwar Technology Rohmadi , Wahyu; CTECH Labs Edwar Technology Widada , Warsito; CTECH Labs Edwar Technology P. Taruno
 Capacitance measurement accuracy is affected by phase conformity between signal and reference. This work describes phase detection scheme which is necessary for phase synchronization in tomography application. Core processing for calculating phase and amplitude of the detected signal was built on FPGA (Field-Programmable Gate-Array) platform. Phase shift demodulation algorithm employs IP core provided by Xilinx FPGA. Direct digital synthesizer (DDS), multiplier, accumulator, and CORDIC (coordinate rotation digital computer) modules were used as excitation-reference signal generator, signal multiplication, accumulation, and conversion to polar coordinate in order to conduct trigonometric operation respectively. Hardware design was emulated on MATLAB-Xilinx System Generator to observe its performance. Phase detection range 0-114.58o and mean absolute error 0.58o have been achieved. Data processing rate solely at digital signal stage was approximately 100data/s suitable for 32-channel electrical capacitance volume tomography (ECVT) system.
Volume: 13
Issue: 1
Page: 55-64
Publish at: 2015-03-01

Modified Greedy Physical Link Scheduling Algorithm for Improving Wireless Mesh Network Performance

10.12928/telkomnika.v13i1.790
Nachwan Mufti; Universitas Indonesia Adriansyah , Muhamad; Universitas Indonesia Asvial , Bagio; Universitas Indonesia Budiardjo
The algorithm to allocate mesh active link to radio resource timeslot in wireless mesh network (WMN) is investigated. This paper proposes the novel method to allocate multiple links in one timeslot for improving the wireless mesh network throughput via spatial time division multiple access (STDMA) protocol. The throughput improvement is obtained by modifying greedy based algorithm that is widely known as a low complexity algorithm. We propose and investigate new parameters in the greedy based algorithm that can be used as scheduling control parameters, i.e. interference weight, scheduling weight, and the sum of link’s degree. Simulation results indicate that this approximation increases network performance in throughput and length of scheduling performance closed to the upper bound performance that is achieved by the algorithm that uses the physical interference model. 
Volume: 13
Issue: 1
Page: 202-210
Publish at: 2015-03-01

Grid Based Cluster Head Selection Mechanism for Wireless sensor network

10.12928/telkomnika.v13i1.1190
Khalid; Universiti Teknologi Malaysia Haseeb , Kamalrulnizam; Universiti Teknologi Malaysia Abu Bakar , Abdul Hanan; Universiti Teknologi Malaysia Abdullah , Adnan; Universiti Teknologi Malaysia Ahmed
Wireless sensor network (WSN) consists of hundred to thousands sensor nodes to gathered the information from physical environment. Different clustering based algorithms have been proposed to improve network lifetime and energy efficiency. Practically it is not feasible to recharge the battery of sensor nodes when they are sensing the data. In such situation energy is crucial resource and it should be improved for life span of WSN. Cluster head (CH) has an important role in hierarchical energy efficient routing protocols because it receives data from nodes and sends towards base station (BS) or sink node. This paper presents a grid based cluster head selection (GBCHS) mechanism by dividing the network field into MXN uniform size partitions that aims to minimize the energy dissipation of sensor nodes and enhancing network lifetime. Simulation experiments have been performed in network simulator (NS2) that show our proposed GBCHS approach outperformed than standard clustering hierarchy LEACH protocol.
Volume: 13
Issue: 1
Page: 269-276
Publish at: 2015-03-01

Fuzzy Clustering Image Segmentation Based on Particle Swarm Optimization

10.12928/telkomnika.v13i1.1269
Zhanshen; Xu Chang University Feng , Boping; Xu Chang University Zhang
Image segmentation refers to the technology to segment the image into different regions with different characteristics and to extract useful objectives, and it is a key step from image processing to image analysis. Based on the comprehensive study of image segmentation technology, this paper analyzes the advantages and disadvantages of the existing fuzzy clustering algorithms; integrates the particle swarm optimization (PSO) with the characteristics of global optimization and rapid convergence and fuzzy clustering (FC) algorithm with fuzzy clustering effects starting from the perspective of particle swarm and fuzzy membership restrictions and gets a PSO-FC image segmentation algorithm so as to effectively avoid being trapped into the local optimum and improve the stability and reliability of clustering algorithm. The experimental results show that this new PSO-FC algorithm has excellent image segmentation effects.
Volume: 13
Issue: 1
Page: 128-136
Publish at: 2015-03-01

Malaria Disease Distribution in Sudan Using Time Series ARIMA Model

10.11591/ijphs.v4i1.4705
Mohammed Ibrahim Musa
Malaria is widely spread and distributed in the tropical and subtropical regions of the world. Sudan is a sub-Saharan African country that is highly affected by malaria with 7.5 million cases and 35,000 deaths every year. The auto-regressive integrated moving average (ARIMA) model was used to predict the spread of malaria in the Sudan. The ARIMA model used malaria cases from 2006 to 2011 as a training set, and data from 2012 as a testing set, and created the best model fitted to forecast the malaria cases in Sudan for years 2013 and 2014. The ARIMAX model was carried out to examine the relationship between malaria cases and climate factors with diagnostics of previous malaria cases using the least Bayesian Information Criteria (BIC) values. The results indicated that there were four different models, the ARIMA model of the average for the overall states is (1,0,1)(0,1,1)12. The ARIMAX model showed that there is a significant variation between the states in Sudan.
Volume: 4
Issue: 1
Page: 7-16
Publish at: 2015-03-01

Association of Men's Awareness of Danger Sign of Obstetric Complication and Male Involvement’s in Birth Preparedness Practices at South Ethiopia

10.11591/ijphs.v4i1.4713
Alemu Tamiso Debiso , Behailu Merdekios , Marelign Tilahun
The Ethiopian Demographic and Health Survey (EDHS) indicate that maternal mortality in Ethiopia is one of the highest in the world. This death toll can be prevented partially through increasing awareness on danger sign of obstetric complications and birth preparedness practices for mother, husbands and other family members. Community based cross sectional study was done. Adult males with a wife or partner who had been through childbirth in the preceding 36 months were included in the study. Data was collected by pretested structured questionnaires and multi stage cluster sampling was used to reach 845 samples which were calculated by using StatCalc program of Epi Info 7. Collected data was cleaned and entered in to Epi Info 7 and exported to SPSS (IBM-20) for further analysis. Hierarchical logistic regression model and adjusted odds ratio with 95% confident interval were used to show association between men awareness and birth preparedness practices. The total numbers of men interviewed were 836 that makes response rate of 98.9%. Severe abdominal pain (87%) was the most recognized danger sign during pregnancy and 17.9% men involve in saving money.  Forty two point two percent of men had awareness of danger sign and 9.4 %( 95% CI: (7.42, 11.4) of men involved in birth preparedness practice. Strong association between men awareness of danger sign of obstetric complications and involvements in birth preparedness practices persisted after adjusting for probable confounders. Thus respondents who had awareness of danger signs were two times (AOR: 1.91, 95% CI: 1.06, 3.41) more likely to involve in preparedness practice than respondents who had no awareness of danger signs of obstetric complication. The prevalence of men awareness of danger sign & involvement in birth preparedness practice was very low.
Volume: 4
Issue: 1
Page: 63-70
Publish at: 2015-03-01

Comparative Antioxidant Activity on The Ficus benjamina and Annona reticulata Leaves

10.11591/ijphs.v4i1.4707
Nyi Mekar Saptarini , Irma Erika Herawati
Antioxidants can prevent free radical formation. Natural antioxidants found in many plants, such as Ficus benjamina and Annona reticulata. The study aimed to compare the antioxidant activity of extracts and fractions of Ficus benjamina and Annona reticulata leaves against 1,1-diphenyl-2-picrilhydrazyl. The steps of this study consist of extraction, fractionation with n-hexane, ethyl acetate and water, phytochemical screening, antioxidant activity determination, and comparing the IC50 values. Percentage scavenging activity of the extracts and fractions against DPPH was calculated to determine the antioxidant activity. The IC50 value of Ficus benjamina was 127.86 ppm for ethanolic extract, 94.01 ppm for water fraction, 115.48 ppm for ethyl acetate fraction, and 335.50 ppm for n-hexane fraction. The IC50 value of Annona reticulata was 274.31 ppm for ethanolic extract, 211.42 ppm for water fraction, 367.91 ppm for ethyl acetate fraction, and 741.08 ppm for n-hexane fraction. The results showed that the Ficus benjamina water fraction was the best antioxidant compared to other extract and fraction.
Volume: 4
Issue: 1
Page: 21-26
Publish at: 2015-03-01

Mood Change of English, French and Chinese Immigrants in Ottawa-Gatineau Region, Canada

10.11591/ijphs.v4i1.4711
Ning Tang , Colin MacDougall
This multicultural study aimed at examining moodchange of English, French and Chinese speaking immigrants in Ottawa-Gatineau Region, Canada, and identifying demographic factors that impact the change. 810 immigrants of English, French and Chinese speaking sub-groupswere recruited by purposive-sampling. Using self-reports, respondents answered questions regarding moodchange (moodstatus change and mood belief change) and demography in Multicultural Lifestyle Change Questionnaire of English, French or Chinese version. Data were analyzed statistically for the different immigrant sub-groups. Immigrants of different gender, language and category sub-groups exhibited different Mood Change Rates, Mood Improving Rates,Mood Declining Rates and MoodBelief Change Rates. There was no statistical difference between the ratesof immigrant sub-groups.Mood Change (MoodStatus Change + MoodBelief Change) was correlated positively with Mother Tongue and negatively with Speaking Languages. Mood Status  Change was negatively correlated with Marital Status and Highest Level of Education. Mother Tongue, Speaking Languages and Highest Level of Education significantly impacted MoodChange (Mood Status Change + Mood Belief Change). Marital Status and Highest Level of Education significantly influenced Mood Status Change. Immigrants of different sub-groups in Canada experienceddifferentmoodchanges. Marital Status and Highest Level of Educationwerethe main factors impacting Mood Status Change. Mother Tongue and Speaking Languages werethe principal factors influencing Mood Belief Change. Culture was an important factor contributing Mood Change. Acculturation could impact Mood Status Change and Mood Belief Change. Data of immigrant mood change can provide evidence for health policy-making and policy-revising in Canada.
Volume: 4
Issue: 1
Page: 50-57
Publish at: 2015-03-01

Slots and Notches Loaded Microstrip Patch Antenna for Wireless Communication

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4241
Ashish Singh , Kamakshi Kamakshi , Mohd. Aneesh , J.A. Ansari
In this article, the theoretical investigations are carried out on slots and notches loaded microstrip patch antenna for dual-band operations. The antenna parameters are calculated such as return loss, VSWR and radiation pattern. It is observed that antenna resonates at three distinct modes of frequencies of 1.490/1.953/2.941 GHz. The characteristics behaviors of the proposed antenna are compared with other coaxial fed microstrip patch antennas. The bandwidth of the proposed antenna at modes TM01 is 2.01 %( simulated) and 3.42 % (theoretical), TM02 is 1.10 %( simulated) and 3.81 % (theoretical) and TM03 is   1.01 % (simulated) and 4.80 % (theoretical). The theoretical results are compared with IE3D simulation results as well as reported experimental results and they are in close agreement. DOI:  http://dx.doi.org/10.11591/telkomnika.v13i3.7282 
Volume: 13
Issue: 3
Page: 584-594
Publish at: 2015-03-01

The Efficacy of The Integrated Child Development Services in Perspective to Nutritional Condition and Growth Development

10.11591/ijphs.v4i1.4706
Jemy Elizabeth Joseph , Shiju Mathew
A survey was conducted to assess the nutritional status of children (0-6 years) among 40 Anganwadis in 4 districts of Kerala State registered under the ICDS scheme. A self- prepared structured interview schedule was used. To get the qualitative information of the study anthropometric measures include height and weight were used for assessing nutritional status of the children. The stepwise analysis of two variables height for age and weight for age was applicable on the basis of Waterlow’s and Gomez’ classification. To examine the relationship between nutritional status of the child and selected variable that affects nutritional status of children, Chi-square test was employed. Based on Gomez’ classification, out of 400 children, only 300 (75.0%) of children received supplementary nutrition through ICDS out of which 250 (62.5%) children were normal while 50 (12.5%) were underweight. Based on Waterlow’s classification out of 400 children, only 290 (72.5%) of children received supplementary nutrition through ICDS out of these children 200 (50 %) were normal while 90 (22.5%) were stunted. It can thus be concluded that majority of children were normal who received supplementary nutrition through ICDS.
Volume: 4
Issue: 1
Page: 17-20
Publish at: 2015-03-01

Antioxidant Activity of Some Selected East Borneo Plants

10.11591/ijphs.v4i1.4712
Islamudin Ahmad , Risky Sulistiarini , Laode Rijai
The native plants of East Borneo the Costus specious (Koening) J.E. Smith stem, Lagerstroema spesiosa Pers leaf, Cerbera mangans L leaf, Vitis trifolia L fruit., Scurrula atropurpurea (Blume) Danser root, Brucea javanica (L.) Merr. leaf, Lygodium microphyllum, Bidens Chinensis Willd., Sonneratia caseolaris L. peel, Sonneratia caseolaris L. stem is almost under-explored for their potensial benefits. They were extracted by the solvents of increasing polarity (n-hexane, ethyl acetate, and n-butanol) were tested for their free radical activity against DPPH (2,2-diphenyl-1-picrylhydrazyl). The ethyl acetate extract of Costus spesiosus (Koening) J. E. Smith antioxidant were screnned concentration of 68 ppm, similarly athyl acetate extract of Vitis trivolia L., showed antioxidant activity at 64,30 ppm. As the ethyl acetate extract of Scurrulla atropurpurea (Blume), Brucea javanica (L.) Merr, Lygodium microphyllum and Sonneratia caseolaris L. stem, showed antioxidant activity at 273,52 ppm, 91,12 ppm, 17,39 ppm and 7,03 ppm. N-butanol extract of Lagerstroema spesiosa Pers, Cerbera mangans L, Bidens chinensis Willd, and Sonneratia caseolaris L. peel showed 8,37 ppm, 128,59 ppm, 18,17 ppm and 54,29 ppm antioxidant activity using DPPH model systems. Owing to the property, the studies can be further extended to exploit them for their possible application for preservation of food products as well as their use as health supplements.
Volume: 4
Issue: 1
Page: 58-62
Publish at: 2015-03-01

Public Health Promotion: Autonomy of the Emergency Nurse Practitioner

10.11591/ijphs.v4i1.4708
Cheryl Ann Alexander , Lidong Wang
The purpose of this paper is to examine several key issues in health care reform. From the Patient Protection and Affordable Care Act of 2010 to the cholera epidemic in Haiti, global health care reform is necessary to promote health and wellness among all nations. There is an international shortage of nurses and nursing faculty. Among the providers, it is also necessary to examine autonomy of the most up and coming nurse provider: the emergency nurse practitioner.
Volume: 4
Issue: 1
Page: 27-36
Publish at: 2015-03-01

Raja Bandung Banana (Musa paradisiacaL.cv Raja Bandung) Prevents Increased Systolic Blood Pressure in Rats Given Acute Stress Test

10.11591/ijphs.v4i1.4709
Dina Septari Anindyah , Arta Farmawati
The relationships between stress and hypertension have been evaluated. Heightened blood pressure (BP) reactions to acute stress have been implicated in cardiovascular disease’s development. Consumption of fruit or vegetables lowering BP. This study aimed to evaluate the effect of Raja Bandung Banana (Musa paradisiacaL. cv Raja Bandung) on blood pressure after acute restraint stress and forced swim test.Twenty male Sprague dawley rats were divided into 4 groups (A,B,C,D) and adapted for 3 days. At 4th day, groups were administered 2 g/200gBw AIN-93M, then exposed to acute restraint (1hour), except group A. After restraint, A&B received water, C received diazepam 0,5mg/kgBW, and D received banana 2,52 g/200gBW. One hour later, the forced swim test was carried out (45 minutes). Blood pressure was measured 1 hour after swim. Result showed,mean of blood pressure significantly increased after treatment (p<0,01) all groups. But, the increasing of blood pressure in C and D group was lower than unrestraint (A) and control (B) group. There was significant difference of blood pressure between control (A&B) and intervention group (C&D), but no significant difference between C and D. Thisresults indicate that Raja Bandung Banana can prevent increased blood pressure on acute stress condition as effective as diazepam.  
Volume: 4
Issue: 1
Page: 37-43
Publish at: 2015-03-01

Factors Affecting Adherence to Pediatrics Antiretroviral Therapy in Mekelle Hospital, Tigray Ethiopia

10.11591/ijphs.v4i1.4704
Teklemariam Gultie , Tesfay G/Amlak , Girum Sebsibie
The most important factor in the success of HIV treatment is adherence to antiretroviral therapy (ART).The challenge to adherence to ART is particularly serious in Sub-Saharan Africa as the high rates of HIV/AIDS lead to greater numbers of affected individuals. Although long-term good ART adherence has been observed in certain settings of public sectors the magnitude of this challenge in Sub-Saharan Africa remains large and there is evidence for high rates of patient’s poor adherence. Study aimed to assess the factors affecting adherence to pediatrics antiretroviral therapy (ART) among children in Mekelle hospital, Tigray, Ethiopia. A Hospital based cross-sectional study was conducted on 226 children on antiretroviral therapy from May 01 to 30/2014 at Mekelle hospital. Data was collected from care givers of children under 15 years old who are on ART. Of the 226 children under 15 years, 90.3 % reported complete adherence to antiretroviral therapy medications at the regular schedule over the past 7 days. Factors associated with adherence were having male care giver (AOR=2.10[1.01, 7.22]), age of the child (AOR=1.43[1.16, 3.98]) below 5 years and use of first line ART drugs (AOR=2.86[1.54, 3.67]). Over all the adherence of children on ART to their medication in this study is relatively higher as compared to others. However, complete adherence is expected in order to make the drugs effective. Different strategies have to be designed to improve the adherence level.
Volume: 4
Issue: 1
Page: 1-6
Publish at: 2015-03-01
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