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29,758 Article Results

New technique combining the Tone Reservation method with Clipping technique to reduce the Peak-to-Average Power Ratio

10.11591/ijece.v8i6.pp5215-5226
Hajar Abdelali
Nonlinear distortions and impairments appear in multicarrier signal with high fluctuations when amplified by a Radio Frequency Power Amplifier (RF PA). Clipping (CL) technique offers a simple way to reduce these fluctuations in Orthogonal Frequency Division Multiplexing (OFDM) Technique, but may degrade seriously the transmission quality. This is why the new mobile standards propose other methods, like the Tone Reservation (TR) technique in the Digital Video Broadcasting-Terrestrial (DVB-T), that reduce the Peak-to-Average Power Ratio (PAPR) without reaching optimal performances. This paper deals with how we can use the TR technique, which exploits null sub-carriers for generating corrective signal, in combining to CL technique in order to improve PAPR reduction without data loss. Also, we show some comparison results on the PAPR reduction obtained with proposed scheme and other techniques. Experiments using a simulated example on a complete WiMax 802.16e transmitter have been made in order to investigate the PAPR reduction performances on presence of the non-linear Power Amplifier model based on gain compression response and phase distortion.
Volume: 8
Issue: 6
Page: 5215-5226
Publish at: 2018-12-01

Elliptical BandPassThree Dimensional Frequency Selective Surface with Multiple Transmission Zeros

10.11591/ijeecs.v12.i3.pp1020-1029
Bimal Raj Dutta , Binod Kumar Kanaujia , Chhaya Dalela
An elliptic band pass response three-dimensional Frequency Selective Surface (3D FSS) is designed from a single unit cell of 2D array of two shielded microstrip lines. The designed FSS provides pseudo-elliptic band-pass frequency response (5.4 – 9.6) GHz with its application in long-distance radio telecommunications and space communications etc. The four transmission zeros at 5.4GHz, 9.6GHz, 12.4GHz and 15GHz provides wide out-of-band frequency rejection. The 3D FSS is independent of the variations in the incident angle of the plane wave up to 60 degree. Each unit cell is a combination of two shielded microstrip lines with one having an air gap and the other one having in between rectangular metallic plate. When a TE polarized plane wave incidents perpendicular to the perfect electric conductor (PEC) boundary walls shielded microstrip lines, it results in two quasi-TEM modes namely air and substrate mode. The 3D FSS consists of multiple resonators with a multimode cavity having number of propagating modes. These resonating modes in phase provide transmission poles and when out of phase give transmission zeros. The 3D FSS structure is simulated using Ansys HFSS software with improved performance over 2DFSS, for many practical applications such as antenna sub-reflector, radomes and spatial filters.
Volume: 12
Issue: 3
Page: 1020-1029
Publish at: 2018-12-01

Assessment of Internet Banking Services Continued Use: Role of Socio-Cognitive and Relational View

10.12928/telkomnika.v16i6.4059
Mira; International Islamic University Malaysia Kartiwi , Ali; Misurata University Rfieda
Recently, continued use of information systems in general and particularly the context of internet banking has drawn increasing attention both in academic and trade literatures. However, different perspectives that determine the continued use of internet banking has been addressed. Given the long-term goal of any business entity is to increase its productivity, expand its customer base and maximize revenues, it is crucial for banks offering internet banking services to focus on encouraging their customers to continually use internet banking. While emerging attention had been given on the assessment of continued use of internet banking services from single view, little of attention were given from researchers to combine different views in a single comprehensive model. Yet, it is believe that combining different views would provide a better understanding to the issues surrounding the continued use. Drawing on the literature, this study developed a model to determine factors that influence the continued use of internet banking by combining factors from the socio-cognitive view and the relational view. Using a survey questionnaire, 450 questionnaires were distributed to users of internet banking in Libya. A number of interesting findings emerged, among others, is the lack of association between trust and perception to continue using the internet banking services in Libya.
Volume: 16
Issue: 6
Page: 2817-2827
Publish at: 2018-12-01

Underwater Image De-nosing using Discrete Wavelet Transform and Pre-Whitening Filter

10.12928/telkomnika.v16i6.9236
Mohanad Najm; University of Technology Abdulwahed , Ali Kamil; University of Technology Ahmed
Image denoising and improvement are essential processes in many underwater applications. Various scientific studies, including marine science and territorial defence, require underwater exploration. When it occurs underwater, noise power spectral density is inconsistent within a certain range of frequency, and the noise autocorrelation function is not a delta function. Therefore, underwater noise is characterised as coloured noise. In this study, a novel image denoising technique is proposed using discrete wavelet transform with different basis functions and a whitening filter, which converts coloured noise characteristics to white noise prior to the denoising process. Results of the proposed method depend on the following performance measures: peak signal-to-noise ratio (PSNR) and mean squared error. The results of different wavelet bases, such as Debauchies, biorthogonal and symlet, indicate that the denoising process that uses a pre-whitening filter produces more prominent images and better PSNR values than other methods.
Volume: 16
Issue: 6
Page: 2622-2629
Publish at: 2018-12-01

Hybrid Filter Scheme for Optimizing Indoor Mobile Cooperative Tracking System

10.12928/telkomnika.v16i6.10162
Rafina Destiarti; Institut Teknologi Telkom Purwokerto Ainul , Prima; Politeknik Elektronika Negeri Surabaya Kristalina , Amang; Politeknik Elektronika Negeri Surabaya Sudarsono
The precise indoor tracking system using Xbee signal strength protocol has become a potential research to the WSN applications. The main aspects for the success tracking system is accuracy performance based on location estimation. The improvement of location estimation is complicated issue, especially using RSSI with low accuracy due to the signal attenuation from multipath effect at indoor propagation. Hence, many existing research typically focused on specific methods for providing improvement schemes at tracking system area. Then, we propose hybrid filter schemes, including extended gradient filter (EGF) for filtering noise signal based distance modification, and modified extended Kalman filter (MIEKF) will be combined with trilateration for filtering the error position estimation. Using mobile cooperative tracking scenario refers to our previous work, the proposed hybrid filter scheme which is called modified iterated extended gradient Kalman filter (MIEGKF) can optimize the error estimation around 41.28% reduction with 0.63 meters MSE (mean square error) value.
Volume: 16
Issue: 6
Page: 2536-2548
Publish at: 2018-12-01

Hybrid Multilevel Thresholding and Improved Harmony Search Algorithm for Segmentation

10.11591/ijece.v8i6.pp4593-4602
Erwin Erwin , Saparudin Saparudin , Wulandari Saputri
This paper proposes a new method for image segmentation is hybrid multilevel thresholding and improved harmony search algorithm. Improved harmony search algorithm which is a method for finding vector solutions by increasing its accuracy. The proposed method looks for a random candidate solution, then its quality is evaluated through the Otsu objective function. Furthermore, the operator continues to evolve the solution candidate circuit until the optimal solution is found. The dataset used in this study is the retina dataset, tongue, lenna, baboon, and cameraman. The experimental results show that this method produces the high performance as seen from peak signal-to-noise ratio analysis (PNSR). The PNSR result for retinal image averaged 40.342 dB while for the average tongue image 35.340 dB. For lenna, baboon and cameramen produce an average of 33.781 dB, 33.499 dB, and 34.869 dB. Furthermore, the process of object recognition and identification is expected to use this method to produce a high degree of accuracy.
Volume: 8
Issue: 6
Page: 4593-4602
Publish at: 2018-12-01

Optimization Based Liver Contour Extraction of Abdominal CT Images

10.11591/ijece.v8i6.pp5061-5070
Jayanthi Muthuswamy , B Kanmani
This paper introduces computer aided analysis system for diagnosis of liver abnormality in abdominal CT images. Segmenting the liver and visualizing the region of interest is a most challenging task in the field of cancer imaging, due to small observable changes between healthy and unhealthy liver. In this paper, hybrid approach for automatic extraction of liver contour is proposed. To obtain optimal threshold, the proposed work integrates segmentation method with optimization technique in order to provide better accuracy. This method uses bilateral filter for preprocessing and Fuzzy C means clustering (FCM) for segmentation. Mean Grey Wolf Optimization technique (mGWO) has been used to get the optimal threshold. This threshold is used for segmenting the region of interest. From the segmented output, largest connected region are identified using Label Connected Component (LCC) algorithm. The effectiveness of proposed method is quantitatively evaluated by comparing with ground truth obtained from radiologists. The performance criteria like dice coefficient, true positive error and misclassification rate are taken for evaluation.
Volume: 8
Issue: 6
Page: 5061-5070
Publish at: 2018-12-01

Factors Influencing Cloud Computing in Telecommunications Companies

10.11591/ijeecs.v12.i3.pp1334-1339
Raed Wishah , Marwan Al-Nsour , Malek Alharafsheh , Saleh AlKhalaileh , Farah Alshbeekat
This study aims to identify the role of cloud computing in achieving success in e-governance in Jordan. This paper investigates the effect of four accomplishment aspects (availability, flexibility, cost saving and scalability) for executing cloud computing technology in telecommunication companies on Jordan e-governance implementation. A questionnaire was developed to collect data from respondents working for the three-main public mobile telephone network operators: Zain, Orange and Umniah. The Statistical Package for Social Sciences program was used in the descriptive analysis of the responses. The results show that all four success factors have a high level of impact, separately and together, on e-governance in Jordan. Cost saving has the highest impact, followed by scalability, availability and flexibility. Based on these results, the study makes some suggestions for further research that could enrich understanding of the implementation of cloud computing and its effect on egovernance in Jordan.
Volume: 12
Issue: 3
Page: 1334-1339
Publish at: 2018-12-01

Stress, Nutritional Status and Blood Glucose Levels among Patients with Diabetes Mellitus Type 2

10.11591/ijphs.v7i4.14914
Dyah Ayu Kusuma Wardani , Sugiarto Sugiarto , Risya Cilmiaty
Prevalence of diabetes mellitus (DM) was increased significantly. Stress increased cortisol could increase blood glucose levels while obesity could increase insulin resistance. Objective of this study was to examine correlation of stress and nutritional status with blood glucose levels in patients with DM type 2. Design study was cross sectional using 120 samples from patients with DM type 2 at Polyclinic of Internal Disease Dr. Moewardi Hospital Surakarta during April-May 2018. Variables in this study were stress with perceived stress scale 10 items (PSS-10), nutritional status with body mass index (BMI) and blood glucose levels with fasting blood glucose (FBG) and post-prandial blood glucose (PPBG) examination. The results showed that mean of FBG was 152.9±63.66 mg/dL and PPBG was 213.96±70.17 mg/dL. There was no significant correlation between stress and blood glucose levels, by FBG (p=0.389) and PPBG (p=0.202). However, there was significant correlation between nutritional status and PPBG (p=0.016), but FBG was not significant (p=0.209). In conclusion, there was significant correlation between nutritional status and PPBG in patients with DM type 2, but FBG was not significant. However, there was no significant correlation between stress and blood glucose levels in patients with DM type 2.
Volume: 7
Issue: 4
Page: 283-288
Publish at: 2018-12-01

A Detail Study of Wavelet Families for EMG Pattern Recognition

10.11591/ijece.v8i6.pp4221-4229
Jingwei Too , A. R. Abdullah , Norhashimah Mohd Saad , N. Mohd Ali , H. Musa
Wavelet transform (WT) has recently drawn the attention of the researchers due to its potential in electromyography (EMG) recognition system. However, the optimal mother wavelet selection remains a challenge to the application of WT in EMG signal processing. This paper presents a detail study for different mother wavelet function in discrete wavelet transform (DWT) and continuous wavelet transform (CWT). Additionally, the performance of different mother wavelet in DWT and CWT at different decomposition level and scale are also investigated. The mean absolute value (MAV) and wavelength (WL) features are extracted from each CWT and reconstructed DWT wavelet coefficient. A popular machine learning method, support vector machine (SVM) is employed to classify the different types of hand movements. The results showed that the most suitable mother wavelet in CWT are Mexican hat and Symlet 6 at scale 16 and 32, respectively. On the other hand, Symlet 4 and Daubechies 4 at the second decomposition level are found to be the optimal wavelet in DWT. From the analysis, we deduced that Symlet 4 at the second decomposition level in DWT is the most suitable mother wavelet for accurate classification of EMG signals of different hand movements. 
Volume: 8
Issue: 6
Page: 4221-4229
Publish at: 2018-12-01

An Accurate and Efficient Scheduler for Hadoop MapReduce Framework

10.11591/ijeecs.v12.i3.pp1132-1142
D C Vinutha , G.T Raju
MapReduce is the preferred computing framework used in large data analysis and processing applications. Hadoop is a widely used MapReduce framework across different community due to its open source nature. Cloud service provider such as Microsoft azure HDInsight offers resources to its customer and only pays for their use. However, the critical challenges of cloud service provider is to meet user task Service level agreement (SLA) requirement (task deadline). Currently, the onus is on client to compute the amount of resource required to run a job on cloud. This work present a novel makespan model for Hadoop MapReduce framework namely OHMR (Optimized Hadoop MapReduce) to process data in real-time and utilize system resource efficiently. The OHMR present accurate model to compute job makespan time and also present a model to provision the amount of cloud resource required to meet task deadline. The OHMR first build a profile for each job and computes makespan time of job using greedy approach. Furthermore, to provision amount of resource required to meet task deadline Lagrange Multipliers technique is applied. Experiment are conducted on Microsoft Azure HDInsight cloud platform considering different application such as text computing and bioinformatics application to evaluate performance of OHMR of over existing model shows significant performance improvement in terms of computation time. Experiment are conducted on Microsoft Azure HDInsight cloud. Overall good correlation is reported between practical makespan values and theoretical makespan values.
Volume: 12
Issue: 3
Page: 1132-1142
Publish at: 2018-12-01

Knowledge and Attitudes on Fetal Anomalies among Pregnant Women in Teaching Hospital Mahamodara, Galle

10.11591/ijphs.v7i4.14234
K.T.G. Kanchana , P. Youhasan
Fetal anomalies significantly contribute towards neonatal mortality worldwide. In Sri Lanka major cause for neonatal deaths is fetal anomalies 41%. A Descriptive cross-sectional study was conducted in Antenatal clinic, Teaching Hospital, Mahamodara. An interviewer-administered, pretested questionnaire was used. Hundred and fifty pregnant women participated in this study. Majority; 105 (70%) were found in the age of below 30 years, and 80 (53.3%) educated up to G.C.E. Ordinary Level. 83 (53.3%) were multigravida and 93(62%) were planned pregnancies. Higher proportion of the participants; 92(61%) , 88(56.7%) and 123(82%) had good knowledge on the risk factors, pre conception care and on preventive actions related to birth defects respectively. Significant proportion (26.7%) had poor knowledge regarding birth defects. There are 143 (95.3%) of the participants interested to know more information on birth defects, 72% believed birth defects were due to evil spirits. Even though 52% of women did not want to terminate their pregnancy if they had a fetus with anomalies, 80.7% of them opined that the termination of pregnancy with birth defected should be legalized. The educational level, parity and planning of current pregnancy of the participants were significantly correlated (p < 0.05) with their knowledge on pre conception care, preventive actions, knowledge on risk factors on birth defects.
Volume: 7
Issue: 4
Page: 231-235
Publish at: 2018-12-01

Nurse’s Spiritual Care Competencies to Patient with End Stage Breast Cancer

10.11591/ijphs.v7i4.14742
Nurul Rezki Anisa , Kadek Ayu Erika , Rini Rachmawaty
Cancer has many side effects on patient’s physic and mostly on mental which may affect on their quality of life. Physically most patients feel fatigue, insomnia, anorexia, nausea, and vomit while mentally they feel emotional disturbances such as anxiety, stress, or depression. One of the methods to that appropriate to overcome both of the conditions is spiritual care. Many research found that because spiritual care associated with better wellbeing, less emotional disturbance, less substance abuse, greater social support, better health behaviours, so it has impact to longer survival periods. This research aimed to investigate nurse’s spiritual care competencies to patients with end stage cancer. This was descriptive study design employed Spiritual Care Competencies Scale (SCCS) instrument. A total sampling of 24 nurses working in Oncology department in Dr. Wahidin Sudirohusodo Hospital were recruited. This research found that there are 12 nurses (50 %) that work in oncology department have low competencies of spiritual care. Involving spiritual care is associated with better wellbeing and longer survival periods. Therefore, it is necessary to increase the competence of nurses on spiritual care in meeting the spiritual needs of patients with end stage breast cancer. A training of spiritual care can be an alternative for nurses to improve spiritual care in hospitals.
Volume: 7
Issue: 4
Page: 268-273
Publish at: 2018-12-01

A Novel Multipath Routing Ring Protocol Adapted for WMSN

10.11591/ijeecs.v12.i3.pp1045-1053
Bennani Mohamed Taj , Mhamed M. Ait Kbir
In this paper an enhanced protocol of multipath routing ring that is suitable for transferring images by making many upgrades. First, instead of using propagation between the layers, we use certain parameters such distance and delay to pick the next node of the lower layer. Then, we used an heterogeneous network, including sensors (capture and send images) and connectors (serve as a bridge to the sink). Finally, we used  the pyramid decomposition technique. To avoid congestion, we adjust  the number of levels based on the state of the network. To verify our protocol, we used Castalia simulator to simulate the real transmission conditions. Then, we compared it with GPSR protocol and the original Multipath routing ring protocol. Our proposed protocol proves its efficiency by transferring more images with better quality (PSNR) and consuming less energy compared to other protocols.
Volume: 12
Issue: 3
Page: 1045-1053
Publish at: 2018-12-01

Factors Influencing Utilization of Cervical Cancer Screening Services in Kenya: The Case of Nyeri County

10.11591/ijphs.v7i4.15013
Gichogo Agnes Wangeci , David Macharia
Globally, cervical cancer continues to be a major cause of mortality and morbidity among women with developing countries accounting for more than 86% of the deaths from the disease. In Kenya, cervical cancer ranks as the second most frequent cancer among women: regrettably, with 80% of the cases presented during the late stages of the disease when the scope of successful treatment is limited. An opportunity to prevent occurrence of cervical cancer exists through cervical cancer screening for early detection and treatment of precancerous lesions before these develop to cancer. However, only a negligible proportion of women benefit from cervical cancer screening services in developing countries, including Kenya. The purpose of this descriptive survey study was to determine the factors influencing utilization of cervical cancer screening services; and focused on the women seeking maternal and family planning services at Central Provincial General Hospital, Kenya. The study established that, as in most developing countries, utilization of cervical cancer screening services was low, regardless of the women’s education level, autonomy in decision making and even good family support. The low level of awareness on the need for screening services and the long waiting time at the clinic for those seeking the services were identified as the two key issues that negatively influenced the utilization of the screening services, It is therefore recommended that the Ministry of Health and other agencies, including individuals of good will, collaborate in designing and implementing awareness campaigns through the media and other appropriate avenues, including one-to-one encounters, targeting both men and women in the communities. It is also recommended that the male partners support their women in accessing this vital life-saving service.
Volume: 7
Issue: 4
Page: 236-247
Publish at: 2018-12-01
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