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Publisher: Universitas Ahmad Dahlan   (Total: 16 journals)   [Sort by number of followers]

Showing 1 - 16 of 16 Journals sorted alphabetically
Ahmad Dahlan J. of English Studies     Open Access   (Followers: 1)
Bahastra     Open Access  
Berkala Fisika Indonesia     Open Access  
HUMANITAS (Jurnal Psikologi Indonesia)     Open Access   (Followers: 4)
Intl. J. of Advances in Intelligent Informatics     Open Access   (Followers: 6)
J. of Education and Learning     Open Access   (Followers: 11)
J. of Education, Health and Community Psychology     Open Access   (Followers: 7)
Jurnal Hukum Novelty     Open Access  
Jurnal Ilmiah AdMathEdu     Open Access  
Jurnal Informatika     Open Access   (Followers: 1)
Kes Mas : Jurnal Fakultas Kesehatan Masyarakat     Open Access   (Followers: 2)
Media Farmasi     Open Access  
Pharmaciana     Open Access  
Psikopedagogia : Jurnal Bimbingan dan Konseling     Open Access   (Followers: 2)
Spektrum Industri : Jurnal Ilmiah Pengetahuan dan Penerapan Teknik Industri     Open Access  
TELKOMNIKA (Telecommunication, Computing, Electronics and Control)     Open Access   (Followers: 8, SJR: 0.211, h-index: 8)
Journal Cover TELKOMNIKA (Telecommunication, Computing, Electronics and Control)
  [SJR: 0.211]   [H-I: 8]   [8 followers]  Follow
  This is an Open Access Journal Open Access journal
   ISSN (Print) 1693-6930 - ISSN (Online) 2302-9293
   Published by Universitas Ahmad Dahlan Homepage  [16 journals]
  • Combining Parameters Fuel and Greenhouse Gas Emissions Costs for
           Optimization of Power Flow

    • Authors: Ignatius Riyadi Mardiyanto, Hermagasantos Zein, Adi Soeprijanto
      Abstract: Fossil fuel power plant already received the attention of environmentalists since the Kyoto protocol was launched because it is believed to pollute the environment. Based on this protocol, power plants that produce emissions are encouraged to pay compensation. Conventionally, optimization of fuel mix in the electric power system components has not involve emission charges on electricity system. This paper proposes a mathematical model in the calculation of power flow optimization involving CO2e or greenhouse gas emissions from fossil-based power plants. Function of heat rate power plant can be approximated by a linear model with determination coefficient above 80 %, so that they can say this approach is still relevant enough to be used. The objective function derived using mathematical model approach with linear heat rate function, in order to get the relationship between the fuel cost function with CO2e emissions. Namely, it can be shown that both models of fuel costs and CO2e emissions cost as a quadratic
      PubDate: 2017-12-01
      DOI: 10.12928/telkomnika.v15i4.5769
      Issue No: Vol. 15, No. 4 (2017)
  • Intelligent Image Capturing Alarm System Using Raspberry Pi

    • Authors: K.A.M Annuar, N.A. Ab Hadi, S.K. Subramaniam, M. F. Mohd Ab Halim, W.N. Abd Rashid, A.F. Kadmin, M.S. Amri, A. Abdul Salam
      Abstract: Home surveillance system assumes an essential part in this present day living style to help recognizing illegal activities. In this proposed paper, an intelligent image capturing alarm system to protect locker was developed. Raspberry Pi 2 is used as the main controller (server). At the point when any conceivable intrusion is identified, a webcam installed to Raspberry Pi 2 will capture the picture of the intruder. In the meantime, the spotlight or light of the house which represented by an LED will be turned "ON" alongside an alarm sound from a buzzer which is fixed as an output. Taking everything into account, this improvement offers reasonable and easy to use surveillance alarm system.
      PubDate: 2017-12-01
      DOI: 10.12928/telkomnika.v15i4.6532
      Issue No: Vol. 15, No. 4 (2017)
  • Performance Analysis of Data Traffic Offload Scheme on Long-Term Evolution
           and IEEE 802.11ah

    • Authors: Made Adi Paramartha Putra, Doan Perdana, Ridha Muldina Negara
      Abstract: One of new mobile technology is being developed by 3GPP is Long-Term Evolution (LTE). LTE usually used by user because provide high data rate. Many traffic sending over LTE, makes several users didn’t get good Quality of Service (QoS). Traffic diversion is needed to increasing QoS value. It can be done with offloading data method from LTE to Wi-Fi network. This paper using 802.11ah standard to evaluate Wi-Fi network. IEEE 802.11ah have 1000 meters coverage area and efficiency energy mechanism, which is proposed for M2M in 5G techonology. Some research has proven that traffic diversion with offloading can increasing network performance. The contribution of this paper is to evaluate the impact of traffic offload between LTE and IEEE 802.11ah standard. This paper propose two scenarios using increment number of user and increment mobility speed of user to evaluate throughput and delay value before and after the offload process. The simulation will simulate using Network Simulator-3. We can conclude that network performance after offloading is better for every scenario. For increment number of user scenario, throughput value increasing 29.08%, and delay decreasing 8.12%. Scenario with increment mobility speed of user obtain throughput value increasing 37,57%, and delay value decreasing 27.228%.
      PubDate: 2017-12-01
      DOI: 10.12928/telkomnika.v15i4.6033
      Issue No: Vol. 15, No. 4 (2017)
  • Selective Green Device Discovery for Device-to-Device Communication

    • Authors: Bhaskara Narottama, Arfianto Fahmi, Rina Pudji Astuti, Desti Madya Saputri, Nur Andini, Hurianti Vidyaningtyas, Patricius Evander Christy, Obed Rhesa Ludwiniananda, Furry Rachmawati
      Abstract: In the D2D communication, energy-efficiency has become an important factor due to the requirement of the future wireless network. The previous works usually only assume one mode of device discovery, i.e. either use network-assisted (with network supervision) or independent (without network supervision) device discovery regardless the condition of energy efficiency. In this paper, we propose a selective device discovery for device-to-device (D2D) communication to maintain devices’ energy-efficiency. Different from previous works, our proposed method selects the best device discovery mode to get the best energy-efficiency. Moreover, our proposed method also deployed in D2D cluster with multiple cluster heads. The proposed method selects the most suitable mode using thresholds (cluster energy consumption and new device acceptance) and cluster energy expectation. Our experiment results indicate that the proposed method provides decent performance while compared with schemes with full network-assisted and independent device discovery.
      PubDate: 2017-12-01
      DOI: 10.12928/telkomnika.v15i4.6686
      Issue No: Vol. 15, No. 4 (2017)
  • Pairwise Sequence Alignment between HBV and HCC Using Modified Needleman
           Wunsch Algorithm

    • Authors: Lailil Muflikhah
      Abstract: Ths paper aims to find similarity of Hepatitis B virus (HBV) and Hepatocelluler Carcinoma (HCC) DNA sequences.The similarity of sequence allignments indicates that they have similarity of chemical and physical properties. Mutation of the virus DNA in X region has potential role in HCC. It is observed using pairwise sequence alignment of genotype-A in HBV. This paper is to purpose the modified method of Needleman Wunsch algorithm for optimum global DNA sequence alignment. The main idea is to optimize filling matrix and backtracking proccess of DNA components, so that there is reduction of computational time and space complexity.This research is applied to DNA sequence of 858 hepatitis B virus and 12 carcinoma patient. There are 10,296 pairwise of DNA sequences to be aligned globally using the modified method. As a result, it is achieved high similarity of 96.547% and validity of 99.854%. There is reduction of computational time as 34.6% and space complexity as 42.52%
      PubDate: 2017-12-01
      DOI: 10.12928/telkomnika.v15i4.5813
      Issue No: Vol. 15, No. 4 (2017)
  • Contradictory of the Laplacian Smoothing Transform and Linear Discriminant
           Analysis Modeling to Extract the Face Image Features

    • Authors: Arif Muntasa, Indah Agustien Siradjuddin
      Abstract: Laplacian smoothing transform uses the negative diagonal element to generate the new space. The negative diagonal elements will deliver the negative new spaces. The negative new spaces will cause decreasing of the dominant characteristics. Laplacian smoothing transform usually singular matrix, such that the matrix cannot be solved to obtain the ordered-eigenvalues and corresponding eigenvectors. In this research, we propose a modeling to generate the positive diagonal elements to obtain the positive new spaces. The secondly, we propose approach to overcome singularity matrix to found eigenvalues and eigenvectors. Firstly, the method is started to calculate contradictory of the laplacian smoothing matrix. Secondly, we calculate the new space modeling on the contradictory of the laplacian smoothing. Moreover, we calculate eigenvectors of the discriminant analysis. Fourth, we calculate the new space modeling on the discriminant analysis, select and merge features. The proposed method has been tested by using four databases, i.e. ORL, YALE, UoB, and local database (CAI-UTM). Overall, the results indicate that the proposed method can overcome two problems and deliver higher accuracy than similar methods. 
      PubDate: 2017-12-01
      DOI: 10.12928/telkomnika.v15i4.6576
      Issue No: Vol. 15, No. 4 (2017)
  • A Portable Insole Pressure Mapping System

    • Authors: Kian Sek Tee, Yogindra Syam Hari Javahar, Hashim Saim, Wan Nurshazwani Wan Zakaria, Safinaz Binti Mohd Khialdin, Hazlita Isa, M. I. Awad I. Awad, Chin Fhong Soon Fhong Soon
      Abstract: The human locomotion is studied through gait analysis and is best observed instrumentally rather than observing visually. Thus, a portable insole pressure mapping system is built to assist in studying the human gait cycle. The pressure distribution is determined by instrumentally mapping the insole using force sensitive resistive sensors that are connected to Arduino UNO via cables. The values are saved into a secure digital card that could be post processed. Hardware and software design phase are executed for the development of this project. The outcomes match to the knowledge of human gait definitions in static posture and normal walking.
      PubDate: 2017-12-01
      DOI: 10.12928/telkomnika.v15i4.7227
      Issue No: Vol. 15, No. 4 (2017)
  • Important Parameters for Hand Function Assessment of Stroke Patients

    • Authors: H. Abdul Rahman, C. F. Yeong, K. X. Khor, E. L.M. Su
      Abstract: Clinical scales such as Fugl-Meyer Assessment and Motor Assessment Scale are widely used to evaluate stroke patient's motor performance. However, the scoring systems of these assessments provide only rough estimation, making it difficult to objectively quantify impairment and disability or even rehabilitation progress throughout their rehabilitation period. In contrast, robot-based assessments are objective, repeatable, and could potentially reduce the assessment time. However, robot-based assessment scales are not as well established as conventional assessment scale and the correlation to conventional assessment scale is unclear. This paper discusses the important parameters in order to assess the hand function of stroke patients. This knowledge will provide a contribution to the development of a new robot-based assessment device effectively by including the important parameters in the device. The important parameters were included in development of iRest and yielded promising results that illustrate the potential of the important parameters in assessing the hand function of stroke patients.
      PubDate: 2017-12-01
      DOI: 10.12928/telkomnika.v15i4.7228
      Issue No: Vol. 15, No. 4 (2017)
  • Vision Based Human Decoy System for Spot Cooling

    • Authors: Tan Chun Hou, Wan Nurshazwani Wan Zakaria, Tai Sue Jing, Razali Tomari, Tee Kian Sek, Anis Azwani Muhd Suberi
      Abstract: This project aims to reduce the energy consumption of air conditioner usage while maintaining occupant comfort. Cooling down the unoccupied space can be considered as waste of energy. Therefore, a human decoy system is proposed to track any human in the detection area. Image contains depth data in each pixel which can be used to detect the presence of target subject as well as their position. The acquired position data is processed by using MATLAB and subsequently is transmitted to Arduino Mega using serial communication to control stepper motors. The experimental results show that the air conditioner airflow is successfully can be directed to the target human subject with average response of 0.860 seconds per movement within detection area.
      PubDate: 2017-12-01
      DOI: 10.12928/telkomnika.v15i4.7229
      Issue No: Vol. 15, No. 4 (2017)
  • Performance of Modified S-Transform for Power Quality Disturbance
           Detection and Classification

    • Authors: Faridah Hanim M. Noh, Munirah Ab. Rahman, M. Faizal Yaakub
      Abstract: Detection and classification of power quality (PQ) disturbances are an important consideration to electrical utility companies and many industrial customers so that diagnosis and mitigation of such disturbance can be implemented quickly. Power quality signal consists of stationary and non-stationary events which need a robust signal processing technique to analyse the signals. In this paper, Modified S-Transform (MST) was used to analyse single and multiple power quality signals. MST is a modified version of S-transform with improved time-frequency resolution. The power quality signals that are considered in this study are voltage swell, sag, interruption, harmonic, interharmonic, transient, sag plus harmonic and swell plus harmonics. The performance of the proposed method has been studied under noisy and unnoisy condition. Hard thresholding technique has been applied with MST while analysing noisy PQ signals. The result shows that MST is able to give higher classification rate with better time and frequency distribution (TFD) spectrum of the PQ disturbances.  
      PubDate: 2017-12-01
      DOI: 10.12928/telkomnika.v15i4.7230
      Issue No: Vol. 15, No. 4 (2017)
  • New Waste Material to Enhance the Performance of Grounding System

    • Authors: Nazatul Shiema Moh Nazar, Suresh Thanakodi, Hazuwan Muhammad
      Abstract: This paper presents the new waste material to enhance the grounding system application by using Rice Straw Ashes as backfill to reduce the grounding resistance of the grounding system. Due to the importance of the grounding system, this paper discussed the effectiveness of the grounding system after using the additive material. The additive material that used are rice straw ash and bagasse ash. The technique that used in this paper is a vertical type because more economical to install. From the result, it was found that depth of electrode and soil treatment has an impact in reducing the grounding resistance. In addition, Rice Straw ashes provide a better grounding performance comparable to Bagasse ashes. 
      PubDate: 2017-12-01
      DOI: 10.12928/telkomnika.v15i4.7231
      Issue No: Vol. 15, No. 4 (2017)
  • Design and Evaluation of Submersible 11/0.415kV Distribution Substation
           for Flood Prone Areas

    • Authors: M. D. M. Amir, S. Ishak, A. Raj Gopal
      Abstract: Flood levels exceeding 2 metres above ground level has been observed causing electrical equipment in the 11/0.415kV substation to be fully submerged. This caused widespread supply disruption as the equipment need to be switched off due to safety reasons and prevention of further equipment damage. The use of submersible equipment and accessories has been identified as one of the mitigation methods to ensure continuous electrical supply during flood events. A research project was undertaken to develop the design criteria of the selection of submersible equipment and accessories as well as to develop the test method and evaluate the selected submersible equipment and accessories in a substation configuration. All the equipment could continuously operate in ON condition during the wet test. However, design improvements are suggested for the submersible switchgear and feeder pillar for better performance during and after flood events.
      PubDate: 2017-12-01
      DOI: 10.12928/telkomnika.v15i4.7232
      Issue No: Vol. 15, No. 4 (2017)
  • Corona Detection Using Wide Band Antenna and Time Delay Method

    • Authors: A. A. Raj, S. Ishak, M. D. M. Amir, B. Yogendra, M. Raffi
      Abstract: IEEE Std 100-2000 defines corona as a luminous discharge due to ionization of the air surrounding a conductor caused by a voltage gradient exceeding a certain critical value. It occurs when the insulating material begins to ionize or conduct due to voltage stress. Corona brings a lot of damages such as corrosion, loss inoverhead transmission lines and electromagnetic interference. Monitoring of corona may reduce the maintenance and replacement cost of electrical equipment. The motivation of this experiment is to calibrate corona detector antennas in the future. The error obtained will determine the efficiency of the antenna to detect and locate potential coronas in electrical equipment in a substation with switchgears or transformers. The operation bandwidth of the antenna is 320MHz to 1.20GHz making it useful to detect and corona. The measurement method of utilizing delay between signals first peak is effective with average 4.76% error with maximum 10.0% error recorded. This may be used to develop a corona online measuring system in the future.
      PubDate: 2017-12-01
      DOI: 10.12928/telkomnika.v15i4.7233
      Issue No: Vol. 15, No. 4 (2017)
  • Generating A Lighting System By Using Pico Hydro System

    • Authors: G. Subhashini, Devindran Munandy, Raed Abdulla
      Abstract: The main aim of this research is to design and develop LED based lighting system by using Pico hydro power. The proposed system is to use renewable energy to generate power in remote areas. The system is designed in a small scale which capable of lighting up a LED and sustain power when turbine stop to rotate. Reaction turbine is selected to be the suitable model for this Pico Hydro System (PHS). The performance of the system is tested by changing the materials for the blades and determines the suitable number of blades for the system to perform at maximum efficiency. Additional features, such as displaying generated voltage and flow rate has been implemented. It is observed that, the system could generate maximum voltage of 5.46V at the head height of 65 cm with flow rate of 5.51 L/Min. A total of 4.62 watt of net electrical power generated from this PHS, the value is obtained by using theoretical calculation. Finally, the system proves to be efficient in terms of generated voltage and cost, as compared to the journals which is reviewed in the literature. The scale of the design has to be remodified to be implemented in river areas. 
      PubDate: 2017-12-01
      DOI: 10.12928/telkomnika.v15i4.7235
      Issue No: Vol. 15, No. 4 (2017)
  • Investigating Maturity State and Internal Properties of Fruits Using
           Non-Destructive Techniques-A Review

    • Authors: Mohd Fadzli Abd Shaib, Ruzairi Abdul Rahim, S. Z. M. Muji, Azian Abd Aziz Ahmad
      Abstract: The evaluation of internal condition of the fruit via destructive techniques mostly damaged the internal and external fruit structure. However, there are several non-destructive techniques available could be applied in the agricultural industry, specifically for observing internal fruit conditions. Different kinds of internal conditions of fruits are evaluated in terms of their quality and ripeness levels. These non-destructive techniques include fruit evaluation via ultrasonic measurement techniques, light spectroscopy, imaging via Magnetic Resonance Imaging (MRI) and X-Ray, computer vision, electric nose and also vibration. The capabilities and the effectiveness of these techniques towards fruit monitoring are thoroughly discussed. Besides, the drawback of these non-destructive technique has been analysed.
      PubDate: 2017-12-01
      DOI: 10.12928/telkomnika.v15i4.7236
      Issue No: Vol. 15, No. 4 (2017)
  • Image Reconstruction for Solid Profile Measurement in ERT using
           Non-invasive Approach

    • Authors: Yasmin Abdul Wahab, Ruzairi Abdul Rahim, Mohd Hafiz Fazalul Rahima, Leow Pei Ling, Suzanna Ridzuan Aw, Muhammad Jayasuman Pusppanathan, Mohd Fadzli Abd Shaib, Herlina Abdul Rahim, Elmy Johana Mohamad
      Abstract: Image reconstruction software and its image reconstruction algorithm are an important step towards constructing a tomography system. This paper demonstrates an image reconstruction of solid profile using linear back projection (LBP) algorithm and global threshold. A forward problem and inverse problem are discussed. The modelled of sensitivity distributions using COMSOL proved that the system is able to detect the liquid-solid regime in vertical pipe. Additionally, the location of the phantom can be easily distinguished using LBP algorithm and thresholding technique. The simulations and experiments results indicate that the sensitivity distribution of non-invasive ERT system can be applied in getting a tomogram of the medium of interest.
      PubDate: 2017-11-01
      DOI: 10.12928/telkomnika.v15i4.7234
      Issue No: Vol. 15, No. 4 (2017)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Tel: +00 44 (0)131 4513762
Fax: +00 44 (0)131 4513327
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