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28,188 Article Results

Implementing 3D Printer to Produce Parts in Medical Applications

10.11591/ijra.v6i3.pp188-199
Roger Johnson , Charles Taylor , G. H. Massiha
The purpose of this project is to show the ability of a 3D printer to produce temporary parts, molds, and jigs for industrial applications. In the industry, it is common for any replacement parts to be milled by a CNC machine or a large inventory of replacement parts to be kept on standby.  This represents an underutilization of company capital.  This is because there should either be a CNC machine delegated to remake the part, while the other machine is down, or have capital dumped into parts that will not be utilized until a part breaks.  A 3D printer can create a temporary part that can take the place of the broken one until another, more permanent, one can be produced or ordered.  Although, if this was the only thing it would be used for it also would be underutilized and not bringing out its full potential.  It can also make jigs in a fraction of the time, and cost in materials, it would take for a CNC machine to mill it from metal.  This increases flexibility of the 3D printer and does not leave it underutilized, thus not being capital that is underutilized.
Volume: 6
Issue: 3
Page: 188-199
Publish at: 2017-09-01

High Quality Video Assessment Using Salient Features

10.11591/ijeecs.v7.i3.pp761-772
Bhanu Rekha , Ravi Kumar AV
An efficient modified video compression HEVC technique based on high quality assessment saliency features presented for the assessment of high quality videos. To create an efficient saliency map we extract global temporal alignment component and robust spatial components. To obtain high quality saliency here, we combine spatial saliency features and temporal saliency features together for different macroblocks in association with transformed residuals. In this way, our saliency model outperforms all the existing techniques. In this paper, we have generated high reconstruction quality video after compression considering SFU dataset. Our experimental results outperforms all the existing techniques in terms of saliency map detection, PSNR and high-resolution quality.
Volume: 7
Issue: 3
Page: 761-772
Publish at: 2017-09-01

Examining Pre-school Teachers’ and Parents’ Views on Counseling and Guidance Services in Pre-school Education

10.11591/ijere.v6i3.7639
Gulsen Buyuksahin Cevik
Current study aims to reveal the problems that pre-school teachers and parents face, in relation to guidance and counseling services, at schools without psychological counselors. The purpose of including pre-school teachers and parents in the current study was to find out both whether they considered the guidance and counseling services a need and whether their methods of intervention against the problems that they face were functional. The current research was designed with interview technique as a qualitative study method. Research data were collected through a semi-structured interview form developed by the researcher. The researcher met the participants individually and asked the questions on the interview form for the current research. The responses that the participants provided were recorded and later transferred onto computer environment. The study group, formed based on voluntary participation, included total 30 participants with 15 pre-school teachers and 15 parents of pre-school children. Pre-school teacher participants 10 females and 5 males, worked for five different preschools in Adiyaman. Total 15 parents in the study group included nine females and six males. An examination of pre-school teachers’ responses based on the current study findings indicated that majority of the teachers did not prepare an annual counseling and guidance plan. Another finding of the current study was that children of most parents and teachers experience adjustment problems in pre-school. Another finding of the current research is about children’s individual problems. Main individual problems that parents experienced with their children included self-care and social development.
Volume: 6
Issue: 3
Page: 207-215
Publish at: 2017-09-01

Discrete-time Inversion Model Control of a Double-damper System with Uncertain Parameters

10.11591/ijra.v6i3.pp168-177
Marwa Hannachi , Ikbel Bencheikh Ahmed , Dhaou Soudani
This paper addresses the control at discrete time of physical complex systems multi-inputs multi-outputs with variables parameters. Classified among the robust control laws the Internal Model Control (IMC) is adopted in this work to ensure the desired performances adjacent to the complexities of the system. However, the application of this control strategy requires that these different building blocks be open loop stable, which invites us, on the one hand, to apply the algebraic approach of Kharitinov for delimiting the summits stability domain’s system. On the other case, the Linear Matrix Inequalities (LMI) approach is applied to determine the corrector’s stability conditions obtained by a specific inversion of the chosen model. It is in this sense that we contribute by this work to execute the command by inversion the discrete-time model in order to ensure the stability and to maintain the performances the stability conditions of required for the double damper system with variable parameters.
Volume: 6
Issue: 3
Page: 168-177
Publish at: 2017-09-01

Controlling of Mobile Robot by Using of Predictive Controller

10.11591/ijra.v6i3.pp207-215
Alireza Rezaee
In this paper implementation of Model PredictiveController on mobile robot was explained. The conductedexperiments show effectiveness of the proposed method oncontrol of the mobile robot. Furthermore the effects of the modelparameters such as control horizon, prediction horizon,weighting factor and signal filter band on the controllerperformance were studied. Finally, a comparison between thedesigned MPC controller and PID and adaptive controllers waspresented demonstrating superior performance of the ModelPredictive Controllers.
Volume: 6
Issue: 3
Page: 207-215
Publish at: 2017-09-01

Modeling, Analysis and Comparative of Down Sampling based Clamping SV PWM for Cascaded and Diode Clamped Multilevel Inverter fed Induction Motor Drive

10.11591/ijeecs.v7.i3.pp698-707
Ravikumar Bhukya , P. Satish Kumar
This paper presents investigation and performance analysis of novel down sampling based  clamping SV PWM technique for diode and cascaded Multi-level Invereter fed to Induction motor drive. A novel down sampling based clamping SVPWM has developed by adding triangular off set to sinusoidal fundamental waveform is modified by down sampling the reference wave by order of 10 so this technique is called clamping space vector pulse width modulation techniques such as PD, POD and APOD. so as to shift the lower order harmonics to higher order side. This novel carrier is compared with the offset injected space vector reference waveform to generate the required PWM pulses to the inverter. To analyze the performance of the proposed PWM technique it is implemented on  seven level diode and cascaded Multi-level Inverter using Matlab/Simulink software tool for output line, phase voltage, currents, speed, torque and Total harmonic distortion analysis.
Volume: 7
Issue: 3
Page: 698-707
Publish at: 2017-09-01

Genetic Algorithm for Grammar Induction and Rules Verification through a PDA Simulator

10.11591/ijai.v6.i3.pp100-111
Hari Mohan Pandey
The focus of this paper is towards developing a grammatical inference system uses a genetic algorithm (GA), has a powerful global exploration capability that can exploit the optimum offspring. The implemented system runs in two phases: first, generation of grammar rules and verification and then applies the GA’s operation to optimize the rules. A pushdown automata simulator has been developed, which parse the training data over the grammar’s rules. An inverted mutation with random mask and then ‘XOR’ operator has been applied introduces diversity in the population, helps the GA not to get trapped at local optimum. Taguchi method has been incorporated to tune the parameters makes the proposed approach more robust, statistically sound and quickly convergent. The performance of the proposed system has been compared with: classical GA, random offspring GA and crowding algorithms. Overall, a grammatical inference system has been developed that employs a PDA simulator for verification.
Volume: 6
Issue: 3
Page: 100-111
Publish at: 2017-09-01

An Improved Repetitive Control for Circulating Current Restraining in MMC-MTDC

10.12928/telkomnika.v15i3.5854
Yahui; Hunan University Wang , Yijia; Hunan University Cao , Yong; Hunan University Li , Chang; Hunan University Li
The modular multilevel converter (MMC) is widely used in many important application fields such as high voltage DC transmission system. And the multi-terminal architecture of it attracts many attentions. However, the circulating current of MMC is an inherent problem which is mainly caused by the voltage mismatch between arms and DC bus. In this paper, an advanced repetitive control method is proposed. This method is based on the even-harmonic characteristic of the circulating current and the potential feature of repetitive control that it has an internal integration part. The pole diagram of the closed loop transform function of the proposed control system proves the stability of the proposed method. And according to the simulation results of a three-terminal MMC-MTDC model in PSCAD/EMTDC, the improved repetitive control presents better circulation repression ability and superior anti-interference capability by comparing with traditional PI control method. Additionally, the simulation results also indicate that the proposed repetitive controller can restrain the fluctuation of SM voltage more effectively than PI control.
Volume: 15
Issue: 3
Page: 1048-1060
Publish at: 2017-09-01

The Addition Symptoms Parameter on Sentiment Analysis to Measure Public Health Concerns

10.12928/telkomnika.v15i3.4711
Yohanssen; Del Institute of Technology Pratama , Puspoko; Bandung Institute of Technology Ponco Ratno
Information about public health has a very important role not only for health practitioners, but also for goverment. The importance of health information can also affect the emotional changes that occur in the community, especially if there is news about the spread of infectious disease (epidemic) in particular area at the time, such as case of outbreaks Ebola disease or Mers in specific area. Based on data obtained from Semiocast, Indonesia is the country with fifth largest number of Twitter users in the world, where every topic that lively discussed will also influence a global trending topic. This paper will discuss the measurement of public health concern (Degree of Concern) level by using sentiment analysis classification on the twitter status. Sentiment data of the tweets were analyzed and given some value by using a scoring method. The scoring method equation (Kumar A. et al., 2012) will be tested with new additional parameters, ie symptoms parameters. The value of any twitter user sentiment is determined based on adjectives, verbs, and adverbs that contained in the sentence. The method that we used to find the semantic value of adjectives is corpus-based method. While for finding the semantic value of the verb and adverb we used a dictionary-based method.
Volume: 15
Issue: 3
Page: 1301-1309
Publish at: 2017-09-01

Profile of Single Mode Fiber Coupler Combining with Bragg Grating

10.12928/telkomnika.v15i3.6383
Romi Fadli; Dept. of Physics FMIPA Universitas Riau Syahputra , Saktioto; Dept. of Physics FMIPA Universitas Riau Saktioto , Ros; Dept. of Physics FMIPA Universitas Riau Meri , Syamsudhuha; Dept. of Math FMIPA Universitas Riau Syamsudhuha , Okfalisa; Department of Information Technique, FST, UIN SUSKA Okfalisa
This paper describes a numerical experiment of design and operation of a fiber coupler between single mode fiber and fiber Bragg grating (FBG). Both components are coupled depending with optical waveguide and source parameters. A characterization of fiber coupler is simulated by varying long grating of 10 mm to 60 mm using transfer matrix method based on coupled mode equation. The wave peak, transmission, and dispersion parameters are analyzed to determine the performance of the fiber coupler. The transmission spectrum showed the wave peaks rise to any increase in the grating length on channel 1 and channel 2. Transmission on channel 1 and channel 2 decreased from the wavelength range of 1.45μm–1.55μm and rised in the range of 1,55μm–1,65μm for each increment in length of grating. The dispersion showed the zero dispersion at specific wavelength for each increase in length of grating. This component can be applied for controlling information signal in wide range communication.
Volume: 15
Issue: 3
Page: 1103-1107
Publish at: 2017-09-01

HABCO: A Robust Agent on Hybrid Ant-Bee Colony Optimization

10.12928/telkomnika.v15i3.3656
Abba Suganda; Bina Nusantara University Girsang , Chun-Wei; National Ilan University Tsai , Chu-Sing; National Cheng Kung University Yang
The purpose of this research is to generate a robust agent by combining bee colony optimization (BCO) and ELU-Ants for solving traveling salesman problem (TSP), called HABCO. The robust agents, called ant-bees, firstly are grouped into three types scout, follower, recruiter at each stages. Then, the bad agents are high probably discarded, while the good agents are high probably duplicated in earlier steps. This first two steps mimic BCO algorithm. However, constructing tours such as choosing nodes, and updating pheromone are built by ELU-Ants method.To evaluate the performance of the proposed algorithm, HABCO is performed on several benchmark datasets and compared to ACS and BCO. The experimental results show that HABCO achieves the better solution, either with or without 2opt.
Volume: 15
Issue: 3
Page: 1247-1256
Publish at: 2017-09-01

The Pessimistic Investor Sentiments Indicator in Social Networks

10.12928/telkomnika.v15i3.5360
Rui; Harbin Institute of Technology Jin , Hong-Li; Harbin Institute of Technology Zhang , Xing; Harbin Institute of Technology Wang , Xiao-Meng; Harbin Institute of Technology Wang
With the worldwide proliferation of social networks, the social networks have played an important role in the social activities .Peoples are inclined to obtain the corresponding public opinion to make decision such as shopping, education, investment and so on. Analysis of data generated by social networks has become an important field of research, however in the field of public opinion analysis of social networks the quantitative measure indexes are still lacking. In this paper, the calculation method of pessimistic investor sentiments indicator is proposed, and the index has a certain theoretical and practical value.
Volume: 15
Issue: 3
Page: 1328-1334
Publish at: 2017-09-01

Miniaturization of Resonator based on Moore Fractal

10.12928/telkomnika.v15i3.7211
E.; Universiti Tun Hussein Onn Malaysia (UTHM) Mohd , S.; Universiti Tun Hussein Onn Malaysia (UTHM) H. Dahlan
This paper presents the simulation and fabrication of miniaturized half wavelength resonator design using Moore fractal iteration technique. These resonators have been prepared for wireless application at a centre frequency of 2.45GHz using a substrate with dielectric constant of 2.2. The size and performance are compared with the conventional half wavelength open line resonator. It can be shown that the Moore fractal iteration technique able to reduce 46% of the size of conventional half wavelength resonator through first iteration, and 30% through second iteration while maintaining the resonance performance. The resonators have been fabricated using conventional printed circuit board facilities not specialized in microwave devices. However, the unloaded Q-value of the Moore structure generally much lower compared the open line type.
Volume: 15
Issue: 3
Page: 1433–1439
Publish at: 2017-09-01

Integral Backstepping Approach for Mobile Robot Control

10.12928/telkomnika.v15i3.5667
Bouzgou; University of Sciences and Technology of Oran USTO/MB. Oran Kamel , Ibari; University of Sciences and Technology of Oran USTO/MB. Oran Benaoumeur , Benchikh; University of Evry Laredj , Ahmed-Foitih; University of Sciences and Technology of Oran USTO/MB. Oran Zoubir
This paper presents the trajectory tracking problem of a unicycle-type mobile robots. A robust output tracking controller for nonlinear systems in the presence of disturbances is proposed, the approach is based on the combination of integral action and Backstepping technique to compensate for the dynamic disturbances. For desired trajectory, the values of the linear and angular velocities of the robot are assured by the kinematic controller. The control law guarantees stability of the robot by using the lyapunov theorem. The simulation and experimental results are presented to verify the designed trajectory tracking control.
Volume: 15
Issue: 3
Page: 1173-1180
Publish at: 2017-09-01

The Performance of an Integrated Transformer in a DC/DC Converter

10.12928/telkomnika.v15i3.4251
Abdelhadi; USTO-MB University Namoune , Azzedine; USTO-MB University Hamid , Rachid; Hassiba Benbouali University Taleb
The separation between the low-voltage part and high-voltage part of the converter is formed by a transformer that transfers power while jamming the DC ring. The resonant mode power oscillator is utilized to allow elevated competence power transfer. The on-chip transformer is probable to have elevated value inductance, elevated quality factors and elevated coupling coefficient to decrease the loss in the oscillation. The performance of a transformer is extremely dependent on the structure, topology and other essential structures that create it compatible with the integrated circuits IC process such as patterned ground shield (PGS). Different types of transformers are modeled and simulated in MATLAB; the performances are compared to select the optimum design. The on-chip transformer model is simulated and the Results of MATLAB simulation are exposed, showing an excellent agreement in radio frequency RF.
Volume: 15
Issue: 3
Page: 1031-1039
Publish at: 2017-09-01
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