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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

Efficacy of calcium lactate as a biodegradable coagulant for peat water purification: an experiment comparative study

10.11591/ijphs.v14i1.24650
Asmadi Asmadi , Zainal Akhmadi , Suharno Suharno , Yulia Yulia
Kalimantan relies significantly on peat water as a water source. However, due to its high organic content, acidic nature, and intense color, it is not safe to drink. To address this issue, researchers proposed an eco-friendly coagulant, calcium lactate, to remove suspended solids. To test its effectiveness, the coagulant was compared to membrane technologies, specifically nanofiltration (NF) and reverse osmosis (RO), at Rasau Jaya General Hospital in West Kalimantan between April and October 2022. Different pressures, 40, 60, and 80 Psi, were used to test both methods. Before and after treatment, the levels of total coliform, E. coli, pH, total dissolved solid (TDS), turbidity, color, and calcium were examined. The results showed that the best outcomes were achieved at 60 Psi. The combination of 0.8 mg/l calcium lactate and NF met all the standard values, except for color (29 TCU). Calcium lactate and RO, however, produced safe drinking water at 60 Psi from all analyzed parameters (E. coli=0, total coliform=0, pH=6.5, TDS=7.1, nephelometric turbidity units (NTU)=2.8 NTU, color=8.7 TCU, and calcium 7.6 mg/l). The reduction of bacteriological substances achieved 100% for both methods. Overall, the combination of calcium lactate and RO yielded slightly better results than NF.
Volume: 14
Issue: 1
Page: 285-291
Publish at: 2015-03-01

Exploring omentin-1 gene expression and insulin-resistance modulation in diabetic and obese male albino rats

10.11591/ijphs.v14i1.24253
Noorah Saleh Al-Sowayan , Aiesha Mohammed Almutawa
Omentin-1, a cytokine secreted by adipose tissue, plays a role in metabolic regulation and insulin sensitivity. However, there is a lack of understanding about the specific effects of high-intensity training (HIT) in diabetic and obese individuals. The present study investigates the effect of a 5-week HIT program on the omentin-1 gene expression and insulin resistance in diabetic and obese male albino rats. Thirty-two rats weighing between 100-120 grams, were procured and divided into groups: the control group (receiving a normal diet), the high-fat diet group (non-diabetic obese rats), the HIT diabetic group (induced diabetes through streptozotocin administration and subjected to HIT), and the diabetic control group (induced diabetes but not subjected to HIT). The HIT diabetic and HIT obese groups underwent a 5-week HIT protocol, involving treadmill running for 60 minutes at 34 m/min speed, five sessions per week. At the end of the experiment, various parameters including glucose, insulin, insulin resistance, LDL, HDL, TC, TG levels, and omentin-1 gene expression assessed using samples obtained from visceral tissue. SPSS version 25 was used to perform statistical analysis, results as mean±SE. One-way ANOVA identified group differences, with significance level (p-value) of less than 0.05. The findings revealed that omentin-1 gene expression significantly increased in the HIT diabetic group following five weeks of training. Both training groups exhibited reductions in insulin, glucose, and insulin resistance levels. It is concluded that a 5-week HIT program can lead to enhanced omentin-1 gene expression and improved insulin resistance in diabetic and obese male albino rats.
Volume: 14
Issue: 1
Page: 351-360
Publish at: 2015-03-01

Nursing outcomes guideline in major post-floods communities in Indonesia

10.11591/ijphs.v14i1.24389
Agianto Agianto , Herry Setiawan , Novi Mustahdiati Nasri , Yulia Yunara , Muhammad Karunia , Muhammad Fasya Aminullah , Rezka Aulyan Noo , Dwi Wanda Yulianti
Health problems resulting from flooding have a very significant role in the sustainability of people's lives. Major floods hit South Kalimantan, Indonesia in 2021. The impact of the flooding will cause nursing problems in the community. There has been no research on nursing outcomes for communities affected by floods, although research has been conducted on identifying nursing diagnoses for post-flood communities. The aim of the research is to develop nursing outcomes for nursing diagnosis in post-flood communities in Indonesia. Descriptive analytics with a cross-sectional approach. The research sample was 140 people with a consecutive sampling technique using a questionnaire with 207 assessment items on nursing outcomes for nursing diagnoses that emerged in post-flood communities. Univariate analysis was used. The 14 nursing diagnoses that emerged in flood-affected communities, there are 33 nursing outcomes labels with 91 outcome indicators. Nursing diagnoses and nursing outcomes that have been obtained can be made into a guidebook for nursing care in post-flood communities. The quality of nursing services can be improved when a disaster occurs to reduce disability, complications and even death during and after a flood disaster.
Volume: 14
Issue: 1
Page: 400-408
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 effectiveness of using ID broth in identifying the outer membrane protein of Salmonella typhi

10.11591/ijphs.v14i1.23912
Pestariati Pestariati , Suhariyadi Suhariyadi
Typhoid fever is an infection that affects the digestive system. It spreads through contaminated food and drinks due to the Salmonella bacteria. One way to develop immunity against Salmonella typhi is by using outer membrane protein (OMP), which activates the cellular immune system. This research aimed to determine the effectiveness of using ID Broth to identify OMP Salmonella typhi. The study was conducted experimentally at the Institute of Tropical Disease from April 2023 to May 2023. For the study, we obtained three samples of Salmonella typhi isolated from East Java, and each sample was replicated three times. We isolated the bacteria and extracted the OMP to measure its levels and perform electrophoresis with SDS-PAGE. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) is a standard protein analysis method. To address sample loading challenges due to stacking gel transparency, an acidic dye was added to improve visibility without affecting gel performance. In this study nutrient agar from MacConkey medium and ID broth were used as variables. We cultured Salmonella typhi and extracted OMP using the sonication technique. We measured protein levels through the nanodrop method. Salmonella typhi from ID broth produced higher protein levels than Salmonella typhi cultured from MacConkey Medium. It affected the identification of OMP using SDS-PAGE. Lower protein levels lead to fewer protein molecules in the same band zone, causing reduced visibility and readability of the protein bands. The ID broth stabilizes the bacteria's condition before being grown on nutrient agar media.
Volume: 14
Issue: 1
Page: 48-55
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
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