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27,404 Article Results

Poisson Clustering Process on Hotspot in Peatland Area using Kulldorff’s Scan Statistics Method

10.12928/telkomnika.v13i4.2272
Annisa Puspa; Bogor Agricultural University Kirana , Imas Sukaesih; Bogor Agricultural University Sitanggang , Lailan; Bogor Agricultural University Syaufina
The increase in peatland fire’s intensity has encouraged people to develop methods of preventing wildfire. One of the prevention methods is recognizing the distribution pattern of hotspot as one of forest and land fire indicators. We could determine the area that has high fires density based on distribution patterns so any early prevention steps could be performed in that area. This research proposed to recognize the distribution pattern of hotspot clusters in the peatland areas in Sumatera in the year 2014 using Kulldorff’s Scan Statistics (KSS) method with Poisson model. This approach was specifically designed to detect clusters and assess their significance via Monte Carlo replication. Results showed that the method is reliable to detect the clusters of hotspots which have the accuracy of 95%. Riau and South Sumatera province have the highest density of cluster distributions of the hotspot. Based on the maturity level of peat, cluster distributions of hotspot were mostly found in ‘hemic’ maturity level. Based on peatland thickness, cluster distribution of hotspot was mostly found in ‘very deep’ thickness.
Volume: 13
Issue: 4
Page: 1376-1383
Publish at: 2015-12-01

Comparing Performances of Evolutionary Algorithms on the Emission Dispatch and Economic Dispatch Problem

10.12928/telkomnika.v13i4.3166
A.N.; Universitas Negeri Malang Afandi , Irham; Universitas Negeri Malang Fadlika , Andoko; Universitas Negeri Malang Andoko
Evolutionary methods dominate in the computation for breaking out the real problems. For a couple of years, it is more popular than classical methods for solving many cases. Technically, one of real problems is the emission dispatch and economic dispatch (EDED) problem. The EDED problem is used to optimize the power system operation (PSO) at a certain time under some constraints. This paper presents performance comparison between Harvest Season Artificial Bee Colony (HSABC) and Genetic Algorithms on the EDED problem applied to the IEEE-62 bus system. Simulation results show that the tested methods have difference characteristics and abilities for optimizing the PSO based on the EDED problem.
Volume: 13
Issue: 4
Page: 1187-1193
Publish at: 2015-12-01

A Hybrid Sorting Algorithm on Heterogeneous Architectures

10.12928/telkomnika.v13i4.1896
Ming; Wuhan University Xu , Xianbin; Wuhan University Xu , Fang; Huazhong Agriclutural University Zheng , Yuanhua; Wuhan University Yang , Mengjia; Wuhan University Yin
Nowadays high performance computing devices are more common than ever before. The capacity of main memories becomes very huge, CPUs get more cores and computing units that have greater performance. There are more and more machines get accelerators such as GPUs, too. Take full advantages of modern machines that use heterogeneous architectures to get higher performance solutions is a real challenge. There are so much literatures on only use CPUs or GPUs, however, research on algorithms that utilize heterogeneous architectures is comparatively few. In this paper, we propose a novel hybrid sorting algorithm that let CPU cooperate with GPU. To fully utilize computing capability of both CPU and GPU, we used SIMD intrinsic instructions to implement sorting kernels that run on CPU, and adopted radix sort kernels that implemented by CUDA(Compute Unified Device Architecture) that run on GPU. Performance evaluation is promising that our algorithm can sort one billion 32-bit float data in no more than 5 seconds.
Volume: 13
Issue: 4
Page: 1399-1407
Publish at: 2015-12-01

An Optimized Resonant-cap Ka-band IMPATT Oscillator for Broadband Communication

10.11591/ijeecs.v16.i3.pp553-558
Laxmi Prasad Mishra , Mihir Narayan Mohanty , Sudarshan Chakraborty , Monojit Mitra
Demand on capacity and band width increasing day-by-day in the area of wireless communication. One of the solutions is utilization of frequency bands for broadband communication that is related to satellite communication. Mostly Ka-band is used in satellite communication. In this paper, an attempt is taken to design an optimized resonant-cap Ka-band oscillator. To obtain oscillation from Ka-band IMPATT device. It has been embedded in a resonant cavity for which resonant cap structure is used. From this study, it is found that the supply D.C voltage from the top of the diode provides a matching network between the diode and the load to achieve maximum power. Keeping the breakdown voltage of the IMPATT diode fixed, the variation of bias current helps for detailed study and mechanically tuning has been done with variation of cap height, Cap diameter as well as by varying the position of the short using sliding short tuner and verified experimentally. Optimization result is made to get maximum output with maximum efficiency for an optimized cap height, diameter, and position of sliding short tuner. With these facts the work is presented difference tuning methods for resonant cap IMPATT oscillator.
Volume: 16
Issue: 3
Page: 553-558
Publish at: 2015-12-01

Control System for Nutrient Solution of Nutrient Film Technique Using Fuzzy Logic

10.12928/telkomnika.v13i4.2113
Muhammad Naufal Rauf; Bogor Agricultural University Ibrahim , Mohamad; Bogor Agricultural University Solahudin , Slamet; Bogor Agricultural University Widodo
Nutrient Film Technique (NFT) is one of the hydroponic systems, which the nutrient is circulated through root of the plants. Electrical conductivity (EC) of nutrient solution on hydroponic culture is a crucial point that determines the growth rate of the plants and quality of the products. The purpose of this research is to design the control system for nutrient solution to maintain the EC of nutrient solution using Arduino. Fuzzy logic control system was used with EC error and volume of nutrient solution as inputs. Model of tomato cultivation based on certain reference was simulated with scale 1:1440 for cultivation time. This model was used as disturbance of nutrient solution EC due nutrient uptake. The result of observation showed that system could reach setpoint after 130 seconds when the setpoint changes from 1.7 mS/cm to 1.6 mS/cm and 207 seconds from 1.6 mS/cm to 1.9 mS/cm. During observation, RSME value of the system while steady state was 0.005 mS/cm.
Volume: 13
Issue: 4
Page: 1281-1288
Publish at: 2015-12-01

Service Engineering Based on Service Oriented Architecture Methodology

10.12928/telkomnika.v13i4.2388
Suhardi; Institute of Technology Bandung Suhardi , Robin; Deakin University Doss , Purnomo; Deakin University Yustianto
Service Engineering (SE) and Service Oriented Architecture (SOA) originally reside on different plateaus of discipline. SE is defined as a set of activity introducing a new business service, while SOA is a technical approach to redefine an enterprise business processes as a set of IT enabled services. This paper proposes a SOA embedded SE framework as a comprehensive approach in re-defining business service and its IT implementation. After an introduction, a review of existing SE frameworks and SOA methodologies is presented in the paper. Afterward, a complete SE framework is proposed with several results on early case studies. A survey results are then presented to prove the usability and benefit of the proposed framework. The framework is designed and proposed to help practitioners and researchers to conduct service engineering by employing principles and methodology offered by SOA approach.
Volume: 13
Issue: 4
Page: 1466-1477
Publish at: 2015-12-01

An Interactive Mobile Augmented Reality for Tourism Objects at Purbalingga District

10.11591/ijeecs.v16.i3.pp559-564
Imam Tahyudin , Dhanar Intan Surya Saputra , Haviluddin Haviluddin
This paper presents the development of an interactive mobile Augmented Reality (AR) for tourism promotion with eXtreme programming (XP) at Purbalingga district, Central Java that has many places of tourist attractions such as Owabong, Purbasari Pancuran Mas, Sanggaluri Park and Buper Munjuluhur. By applying the AR concept it is expected the tourism objects could be enhanced by augmenting the virtual brochures which could be viewed over a mobile device. In this study, mobile device Android platform is used to display interactive brochures of tourism promotion containing 3D models, animations, and sounds. The brochure will provide information in of real attractions of the tourism objects in the Purbalingga district.
Volume: 16
Issue: 3
Page: 559-564
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

An Automatic Calibration Method for Near-infrared Camera in Optical Surgical Navigation

10.12928/telkomnika.v13i4.3103
RongQian; South China University of Technology Yang , Xuan; South China University of Technology Si , QinYong; South China University of Technology Lin , Ken; Zhongkai University of Agriculture and Engineering Cai
Optical surgical navigation system (SNS) with near-infrared tracking system is becoming extensively used in clinics, and the accuracy of SNS is influenced by the calibration of near-infrared cameras (NIRCs). We propose an automatic calibration method for NIRCs. The method is based on a designed calibration board. In our experiments, corners are automatically extracted to obtain the parameters of NIRCs. This method has the advantages of saving time, efficiency in computation, high accuracy, and reliability. In our experiments, an NIRC can be calibrated in only 5 s. Meanwhile, the average relative errors of the focal length and principal point are 0.87% and 1.39%, respectively.
Volume: 13
Issue: 4
Page: 1289-1297
Publish at: 2015-12-01

Distinguish Sea Turtle and Fish Using Sound Technique in Designing Acoustic Deterrent Device

10.12928/telkomnika.v13i4.1827
Azrul; Politeknik Sultan Hj Ahmad Shah Mahfurdz , Sunardi; Universitas Ahmad Dahlan Sunardi , H.; Universiti Malaysia Pahang Ahmad , Syed; Turtle and Marine Ecosystem Center (TUMEC) Abdullah , Nazuki; Turtle and Marine Ecosystem Center (TUMEC) Nazuki
Acoustic is a common method for underwater object classification and to observe fish schools or other marine animals in their environment, but it was never applied on sea turtle. Knowledge about turtle detection using sound is very limited and there are no target strength (TS) recorded before. In this study, an echo voltage reference methodincorporating standard target was used to measure ex situ target strength of two Green Turtle (Chelonian mydas) and three species of fish (Indian scad, Indian Mackerel and Bigeyescad). The echo signal of animals has been observed from echosounder output and every envelope of the echo was digitized at a sampling rate 1MHz using high speed analog to digital converter (USB‑1208HS). The finding shows a significant difference between fish and turtles aged 18 years old. The result also demonstrates that TS increase as age of turtle increase. This result is considered important in designing an acoustic deterrent device. The result reveals that size, surface, and animal body part influence in determining target strength value.
Volume: 13
Issue: 4
Page: 1305-1311
Publish at: 2015-12-01

Image Restoration Based on Hybrid Ant Colony Algorithm

10.12928/telkomnika.v13i4.1900
Yan; Hunan University of International Economics Feng , Hua; Hunan University of International Economics Lu , Xiliang; Hunan University of International Economics Zeng
Image restoration is the process to eliminate or reduce the image quality degradation in the digital image formation, transmission and recording and its purpose is to process the observed degraded image to make the restored result approximate the un-degraded original image. This paper, based on the basic ant colony algorithm and integrating with the genetic algorithm, proposes an image restoration processing method based on hybrid ant colony algorithm. This method transforms the optimal population information of genetic algorithm into the original pheromone concentration matrix of ant colony algorithm and uses it to compute the parameters of degradation function so as to get a precise estimate of the original image. By analyzing and comparing the restoration results, the method of this paper can not only overcome the influence of noises, but it can also make the image smoother with no fringe effects in the edges and excellent visual effects, verifying its practicability.
Volume: 13
Issue: 4
Page: 1298-1304
Publish at: 2015-12-01

Research on Electromagnetic Excitation Resonant Sensor Based on Microelectromechanical System

10.12928/telkomnika.v13i4.1740
Gang; Heilongjiang University Li , Xiaofeng; Heilongjiang University Zhao , Dianzhong; Heilongjiang University Wen , Yang; Heilongjiang University Yu
In this paper, an electromagnetic excitation resonant sensor was designed based on Microelectromechanical system (MEMS) technology. In this new sensor, four nc-Si/c-Si heterojunction p-MOSFETs are manufactured by using the technique of MEMS on the N-type orientation high resistance silicon wafer, and a Wheatstone bridge is composed of four nc-Si/c-Si heterojunction MOSFETs channel resistances, output voltage of the bridge circuit changes according to the applied pressure. A vibration will be generated when an alternating current is applied to the inductance coil of electromagnetic excitation resonant sensor, the maximum power produced in the central part of the four edges of silicon membrane, whose frequency and amplitude are associated with the current in the inductance coil, and the applied pressure P can be detected. Using mechanics and electromagnetism coupling field analysis by Ansys software, the simulation to vibration situation of the silicon membrane of sensor was carried on when vertical magnetic field and alternating current were loaded. Experimental results show that, as the operating voltage is constant, with the increase of current in the inductance coil the conversion of applied pressure increases, and the output voltage of nc-Si/c-Si heterojunction MOSFETs pressure sensor is proportional to the increase of coil magnetic field i.e. the increase of pressure, the experimental results are consistent with the simulation results.
Volume: 13
Issue: 4
Page: 1121-1126
Publish at: 2015-12-01

Computing Game and Learning State in Serious Game for Learning

10.12928/telkomnika.v13i4.2248
Ririn Dwi; Institut Teknologi Bandung Agustin , Ayu; Institut Teknologi Bandung Purwarianti , Kridanto; Institut Teknologi Bandung Surendro , Iping; Institut Teknologi Bandung S Suwardi
In order to support the adaptive SGfL, teaching materials must be represented in game component that becomes the target of adaptivity. If adaptive architecture of the game only use game state (GS) to recognize player's state, SGfL require another indicator -learning state (LS)- to identify the learning progress. It is a necessary to formulate computational framework for both states in SGfL.The computational framework was divided into two moduls, macro-strategy and micro-strategy. Macro-strategy control the learning path based on learning map in AND-OR Graph data stucture. This paper focus on the Macro-strategy modul, that using online, direct, and centralized adaptivity method. The adaptivity in game has five components as its target. Based on those targets, eight development models of SGfL concept was enumerated. With similarity and difference analysis toward possibility of united LS and GS in computational framework to implement the nine SGfL concept into design and application, there are three groups of the development models i.e. (1) better united GS and LS, (2) must manage LS and GS as different entity, and (3) can choose whether to be united or not. In the model which is united LS with GS, computing model at the macro-strategy modul use and-or graph and forward chaining. However, in the opposite case, macro-strategy requires two intelligent computing solutions, those are and-or graph with forward chaining to manage LS collaborated with Finite State Automata to manage GS. The proposed computational framework of SGfL was resulted from the similarity and difference analysis toward all possible representations of teaching materials into the adaptive components of the game. It was not dependent of type of learning domain and also of the game genre.
Volume: 13
Issue: 4
Page: 1422-1436
Publish at: 2015-12-01

Routing Algorithm Based on Area Division Management of Node in Wireless Sensor Networks

10.12928/telkomnika.v13i4.1895
Gao; Mudanjiang Normal University Wei , Song; Mudanjiang Normal University Yan , Shuping; Mudanjiang Normal University Fan
In order to reduce the communication overhead among sensor nodes, a routing algorithm is proposed based on zoning management nodes. The algorithm defines the calculation method of the network partition radius after nodes deployment, and divides monitored area according to the radius meanwhile layouts one management node in each partition. Then nodes’ communication cost is calculated based on the distance among nodes as well as nodes’ energy, and finishes the selection of routing nodes based on the cost. Finally, using the Matlab simulation environment, the parameters impacting the optimal partition radius are discussed, and the proposed routing algorithm is compared with existing algorithms. Theoretical analysis and experimental results show that the proposed algorithm is more balanced on nodes energy consumption. The algorithm reduces network traffic overhead while extends the lifetime of the network.
Volume: 13
Issue: 4
Page: 1214-1224
Publish at: 2015-12-01

Correlation of Student’s Precursor Emotion towards Learning Science Interest using EEG

10.12928/telkomnika.v13i4.2737
Norzaliza; Kulliyyah of Information & Communication Technology Md Nor , Abdul Wahab; Kulliyyah of Information & Communication Technology Bar , Sheikh Hussain; Universiti Teknologi Malaysia Shaikh Salleh
Mathematics and science are two important subjects for students to do well in school. Unfortunately majority of the students are having difficulties in coping with these subjects. Malaysia is ranked third lowest in the Program for International Student Assessment (PISA) for mathematics and science. An emotionally disturbed student seems to have problem coping with the learning of mathematics and science thus it is important to identify the demotivating factors affecting the performance of such students. In this paper, it analyze the correlation of precursor emotion towards student interest in learning mathematics and science using electroencephalogram (EEG) device. This correlation and their respective emotion can be analyzed based on the 2-D Affective Space Model (ASM) using four basic emotions of happiness, calmness, fear and sadness as reference stimuli. EEG device was used to extract brain waves signal while answering the mathematics and science questions. The EEG signals were captured on the scalp of the student and features extracted using Mel Frequency Cepstral Coefficient (MFCC). Neural network classifier of Multilayer Perceptron (MLP) was used to classify the valence and arousal axes for the ASM. Preliminary results show the relationship of precursor emotion and the dynamic emotions of the student while taking the mathematics and science test. We hope that these results can help us further relate the behavior and interest of students towards the learning of mathematics and science.
Volume: 13
Issue: 4
Page: 1162-1169
Publish at: 2015-12-01
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