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Publisher: Universitas Ahmad Dahlan   (Total: 18 journals)   [Sort by number of followers]

Showing 1 - 18 of 18 Journals sorted alphabetically
Ahmad Dahlan J. of English Studies     Open Access   (Followers: 2)
Bahastra     Open Access  
Berkala Fisika Indonesia     Open Access  
Bulletin of Electrical Engineering and Informatics     Open Access   (Followers: 8)
HUMANITAS (Jurnal Psikologi Indonesia)     Open Access   (Followers: 4)
Intl. J. of Advances in Intelligent Informatics     Open Access   (Followers: 7)
J. of Education and Learning     Open Access   (Followers: 11)
J. of Education, Health and Community Psychology     Open Access   (Followers: 9)
Jurnal Citizenship     Open Access   (Followers: 2)
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: 9, SJR: 0.265, CiteScore: 1)
Journal Cover
TELKOMNIKA (Telecommunication, Computing, Electronics and Control)
Journal Prestige (SJR): 0.265
Citation Impact (citeScore): 1
Number of Followers: 9  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1693-6930 - ISSN (Online) 2302-9293
Published by Universitas Ahmad Dahlan Homepage  [18 journals]
  • Characterization of excitation source LEDs and Sensors without Filters for
           Measuring Fluorescence in Fluorescein and Extract of Green Leaves

    • Authors: Miguel Ángel Garrido Tamayo, Fredy Edimer Hoyos Velasco, John Edwin Candelo-Becerra
      Abstract: In this article, eight light-emitting diodes (LEDs) were characterized; a blue one, a green one, a red one, an infrared, and four violet. The first four LEDs were used as sensors, without optical filters, for fluorescence detection induced by violet LEDs in 11 samples of different concentrations of fluorescein, and in 14 samples of different dilutions of a plant's green leaves extract. It is shown that infrared LED can detect the red emission of green leaf extract, and red and infrared LEDs detect the fluorescence of fluorescein in concentrations of up to 1.8 μM. This system allows and facilitates teaching optical spectroscopy in basic education without incurring high costs
      PubDate: 2019-08-01
      DOI: 10.12928/telkomnika.v17i3.11985
      Issue No: Vol. 17, No. 4 (2019)
       
  • Clustering and Data Aggregation scheme in Undewater Acoustic Sensor
           Network

    • Authors: Vani Krishnaswamy
      Abstract: The important objectives of Underwater Acoustic Sensor Networks (UWASN) are to decrease the consumption of energy and prolong the lifetime of the network. Clustering and data aggregation schemes are employed to achieve the objectives. In this paper, we propose a scheme which involves fuzzy clustering which considers the parameters such as energy and degree of belongingness. The cluster head node is selected considering the parameters such as residual energy and the distance of the node from the sink. Similarity function is deployed to perform data aggregation to lessen the consumption of energy in the overall network. The scheme is simulated in MATLAB and compared with LEACH algorithm. The experimental results indicate that the proposed scheme performs better in terms of parameters like node death rate, alive nodes and energy consumption. 
      PubDate: 2019-08-01
      DOI: 10.12928/telkomnika.v17i4.11379
      Issue No: Vol. 17, No. 4 (2019)
       
  • Energy Harvesting Half-Duplex AF Power Splitting Protocol Relay Network
           over Rician Channel in Case of Maximizing Capacity

    • Authors: Phu Tran Tin, Nguyen Nhat Tan, Thanh-Long Nguyen
      Abstract: In this letter, we propose a novel power splitting protocol for energy harvesting half-duplex AF relaying communication systems. In our proposed system, the relay harvests energy from the source transmissions, by employing adaptive PS protocol, for powering the retransmissions to the destination. The proposed model system í investigated in cases maximize and non-maximize ergodic capacity. Furthermore, we present analytical expressions for the outage probability and ergodic capacity for both cases. Simulation results validate the analytical expressions by using Monte Carlo simulation.
      PubDate: 2019-08-01
      DOI: 10.12928/telkomnika.v17i4.11086
      Issue No: Vol. 17, No. 4 (2019)
       
  • Strategies of Linear Feedback Control and Its Classification

    • Authors: Saad Fawzi AL-Azzawi
      Abstract: This paper is concerned with the control problem for a class of nonlinear dynamical (hyperchaotic) systems based on linear feedback control strategies. Since the obtaining  positive feedback coefficients are required for these strategies. From this point of view, the available ordinary/ dislocated/ enhancing and speed feedback control strategies can be classified into two main aspects, control the dynamical systems or can't  be control although it own a positive feedback coefficients. So, we focused on these cases, and suggest a new method to recognize which system can be controller it or not. In this method, we divided a positive feedback coefficient which obtain from these strategies to four categories according to possibility of suppression and show the reason for each case. Finally, numerical simulations are given to illustrate and verify the results.
      PubDate: 2019-08-01
      DOI: 10.12928/telkomnika.v17i4.10989
      Issue No: Vol. 17, No. 4 (2019)
       
  • Signal Processing with Frequency and Phase Shift Keying Modulation in
           Telecommunications

    • Authors: Juliy Boiko, Volodymyr Tolubko, Oleg Barabash, Oleksander Eromenko, Yevhen Havrylko
      Abstract: In this paper represents research improving effectiveness of signal processing in telecommunication devices especially for its part, which relates to providing its noise resistance in conditions of noise and interference. This objective has been achieved through development of methods and means for optimization of filtering devices and semigraphical interpretation of clock synchronization systems in telecommunications with frequency shift keying on the base of stochastic models what determines relevance of the subject. Separately, in an article considered the urgent task is using of modified synchronization methods based on the interference influence of adjacent symbols on the phase criterion tract, in particular the use of the modified synchronization scheme, in order to get a formalized outlook representation of the synchronization schemas based on the polyphase structures with using a bank of filters, that allows to improve the characteristics of digital telecommunication channels. This work is devoted to the examination and modeling of these ways. The proposed ideas and results for the construction of synchronization systems can be used in modern means of telecommunication.
      PubDate: 2019-08-01
      DOI: 10.12928/telkomnika.v17i4.12168
      Issue No: Vol. 17, No. 4 (2019)
       
  • Automatic Face and VLP’s Recognition for Smart Parking System

    • Authors: Reivind P Persada, Suci Aulia, Burhanuddin D, Sugondo H
      Abstract: One of the concerning issues regarding smart city is Smart Parking. In Smart Parking, some researchers try to provide solutions and breakthroughs on several research topics among security systems, the availability of single space, an IoT framework, etc. In this study, we proposed a security system on Smart Parking based on face recognition and VLP’s (Vehicle License Plates) identification. In this research, SSIM (Structural Similarity) method as part of IQA has been applied due to its reliability and simple computation for face detection and recognition process. From the test results of 30 data, obtained the highest SSIM value 0.83 with the highest accuracy rate of 76.67%. That level of accuracy still has not reached the implementation standard of 99.9%. So that it still needs to be improved in the future studies, especially in the filtering noise section.
      PubDate: 2019-08-01
      DOI: 10.12928/telkomnika.v17i4.11746
      Issue No: Vol. 17, No. 4 (2019)
       
  • Comparison of Semiconductor Lasers at wavelength 980nm & 1480nm using
           InGaAs for EDFA Pumping

    • Authors: Satyo Pradana, Ary Syahriar, Sasono Rahardjo, Ahmad H. Lubis
      Abstract: Long distance Optical Communications are affected by many problems; loss of signal is one of them. Erbium Doped Fiber Amplifier (EDFA) is the key to solve it. By using Semiconductor Laser as pumping source for EDFA, the signal can brought back the performed of EDFA into normal condition. EDFA has a good wavelength operation at 980nm & 1480nm, in that case Semiconductor Laser using InGaAs at 980nm & 1480nm is suitable for them. By using selected wavelength and materials, the Semiconductor Laser can be produced properly. Also, determining the parameter is the important things to construct the Laser. By using Rate Equation, the performed of Semiconductor Laser can obtained several result. Those are injection current as a function of voltage, carrier density, photon density and output power as a function of injection current.
      PubDate: 2019-08-01
      DOI: 10.12928/telkomnika.v17i4.11745
      Issue No: Vol. 17, No. 4 (2019)
       
  • Prototype Distributed Application In Banking Transaction Using Remote
           Method Invocation

    • Authors: Agus Cahyo Nugroho
      Abstract: Today banks have many branches in big cities of the world. System usually used  a central database in a particular city. Increased of database server performance due to number of users accessing this application should not degrade performance of application. To keep  database server performance optimally, application must distributed to the network. Therefore it is going to used three-tier application, because three-tier applications support deployment of distributed-based applications component. In distributed applications it takes a remote method call, that is why we are going to used Remote Method Invocation to develop this system. Based on results of analysis conducted, author can draw some following conclusion of the application, which are it can be run as a separate process on the same computer or run on a different computer, then once the client get a reference from the remote object then method of remote object is called like calling method from local object and methods that we have defined and implemented on remote object can we call or use both on desktop and web applications so we do not need to work twice.
      PubDate: 2019-08-01
      DOI: 10.12928/telkomnika.v17i2.8222
      Issue No: Vol. 17, No. 4 (2019)
       
  • Live Forensics of Tools on Android Devices for Email Forensics

    • Authors: Rusydi Umar, Imam Riadi, Bashor Fauzan Muthohirin
      Abstract: Email is one communication technology that can be used to exchange information, data, and etc. The development of email technology not only can be opened using a computer but can be opened using an smartphone. The most widely used smartphone in Indonesian society is Android. Within a row  the development technology of higher cybercrime such as email fraud catching cybercrime offenders need evidence to be submitted to a court, for obtain evidence can use tools like Wireshark and Networkminer to analyzing network traffic on live networks. Opportunity, we will do a comparison of the forensic tools it to acquire digital evidence. The subject of this research focused on Android-based email service to get as much digital evidence as possible on both tools. This process using National Institute of Standards and Technology method. The results of this research that networkminer managed to get the receiving port, while in Wireshark not found.
      PubDate: 2019-08-01
      DOI: 10.12928/telkomnika.v17i4.11748
      Issue No: Vol. 17, No. 4 (2019)
       
  • Neurocomputing Fundamental Climate Analysis

    • Authors: Rezzy Eko Caraka, Sakhinah Abu Bakar, Muhammad Tahmid, Hasbi Yasin, Isma Dwi Kurniawan
      Abstract: Rainfall is a natural phenomenon that needs to be studied more deeply and interesting to be analyzed. It involves numbers of human activities such as aviation, agriculture, fisheries, and also disaster risk reduction. Moreover, the characteristics of rainfall data follows seasonality, fluctuation, not normally distributed and it makes traditional time series challenging to use. Therefore, neurocomputing model can be used as an alternative to extraction information from rainfall data and give high performance also accuracy. In this paper, we give short preview about SST Anomalies in Manado, Northern Sulawesi and at the same time comparing the performance of rainfall forecasting by using three types of neurocomputing methods such as Generalized Regression Neural Network (GRNN), Feedforward Neural Network (FFNN), and Localized Multi Kernel Support Vector Regression (LMKSVR). In a nutshell, all of neurocomputing methods give highly accurate forecasting as well as reach low MAPE FFNN 1.65%, GRNN 2.65% and LMKSVR 0.28%.
      PubDate: 2019-08-01
      DOI: 10.12928/telkomnika.v17i4.11788
      Issue No: Vol. 17, No. 4 (2019)
       
  • Seller Reputation Impact on Sales Performance in Public E-Marketplace
           Bukalapak

    • Authors: M Ammar Fauzan, Amna Shifia Nisafani, Arif Wibisono
      Abstract: Seller reputation system (SRS) is an online facility in the public e-marketplace to assess how trustworthy a seller is. SRS becomes important for customers to increase transactional confidence and help customers avoid unbelievable sellers. Some researchers mention there were differences results of SRM's influence on sales performance between countries caused by different cultures. This study aims to find out whether SRS affects the number of sales in the context of the Indonesian market. This research used the case study of Bukalapak which the majority of its customers are Indonesian. Afterwards, this study used multiple regression analysis of smartphone sales data available at Bukalapak as product research. In the end, it is evident that in Indonesia online market context, the number of seller’s follower has no effect on sales. Furthermore, price and positive reviews from seller have a significant effect on sales.
      PubDate: 2019-08-01
      DOI: 10.12928/telkomnika.v17i4.11780
      Issue No: Vol. 17, No. 4 (2019)
       
  • Optical Sensor Based on Dye-Sensitized Solar Cell (DSSC) with Tobacco
           Chlorophyll

    • Authors: Eka Maulana, Rahmadwati Rahmadwati, Sapriesty Nainy Sari, Akhmad Sabarudin
      Abstract: Modified optical sensor based on dye-sensittized solar cell has been successfully fabricated to measure the number of light energy. The electric parameters as the sensor output were achieved from the light illuminance as the sensor input. The measured parameter from optical sensor according to the voltage and current output have been characterized to obtain the sensor performance. In this research, the modified sensor is customized from dye-sensitized solar cell with extracted tobacco chlorophyll dye as the photo-catalysator, photo-electrode of titanium dioxide and Iodine solution for redox reaction. The thick layer deposition with selected material is conducted using spin coating method of 1000 rpm. Based on the absorbance measurement, it shows that tobacco dye has the characteristics of visible light absorption in the wavelength of visible light spectra. The analytical result shows that the sensor has the wide linear characteristic in certain light illuminance and the increasing light intensity produces higher electrical parameter output both current and voltage. This sensor has potential prospect to be used as a light sensor and to be competitive fabrication cost.
      PubDate: 2019-08-01
      DOI: 10.12928/telkomnika.v17i4.12613
      Issue No: Vol. 17, No. 4 (2019)
       
  • Ternary Content Addressable Memory for Longest Prefix Matching Based on
           Random Access Memory on Field Programmable Gate Array

    • Authors: Muhammad Nadzir Marsono., Shao Kay Ng
      Abstract: Conventional ternary content addressable memory (TCAM) provides access to stored data, which consists of '0', '1' and ‘don't care’, and outputs the matched address. Content lookup in TCAM can be done in a single cycle, which makes it very important in applications such as address lookup and deep-packet inspection. This paper proposes an improved TCAM architecture with fast update functionality. To support longest prefix matching (LPM), LPM logic are needed to the proposed TCAM. The latency of the proposed LPM logic is dependent on the number of matching addresses in address prefix comparison. In order to improve the throughput, parallel LPM logic is added to improve the throughput by 10× compared to the one without. Although with resource overhead, the cost of throughput per bit is less as compared to the one without parallel LPM logic.
      PubDate: 2019-08-01
      DOI: 10.12928/telkomnika.v17i4.11000
      Issue No: Vol. 17, No. 4 (2019)
       
  • Plasma Generator: Design of Six Stage Cockcroft-Walton Voltage Multiplier
           12 kV for Impulse Voltage Generation

    • Authors: Wijono Wijono, Eka Maulana, Dony Darmawan Putra, Waru Djuriatno
      Abstract: Cockcroft-Walton (CW) voltage multiplier is a voltage booster circuit with an array of series-connected only diodes and capacitors. In this research, voltage multiplier is designed to generate voltage up to 12 kV that the modified 6-stage constructed generator. It is designed as circuit charger of storage capacitor (CS) to generate combination wave impulse application which following standard those set in IEC (International Electrotecnical Commission) 61000-4-5 class 4. CS should be charged up to 4 kV according this standard. High impulse voltage and current works repeatedly in a short time, so the charging system is expected to reach targeted voltage within a maximum time of 10 seconds. Besides charging is also required to design of circuit discharger for discharging electric charge inside the CS. It is expected to reach 0 kV within a maximum time of 15 seconds with overdamped technique. There are three results of the research projects such as output voltage of CW voltage multiplier before connecting CS, charging time of CS, and discharging time of CS. The result showed that CW voltage multiplier can generate up to 12.01 kV on simulation and 11.9 kV on experiment. CS can be charged up to 4 kV in 9.8 seconds on simulation and 7.9 seconds on experiment. CS can be discharged in 14.2 seconds on simulation and 10 seconds on experiment. These results are in accordance with the expectation.
      PubDate: 2019-08-01
      DOI: 10.12928/telkomnika.v17i4.11828
      Issue No: Vol. 17, No. 4 (2019)
       
  • FPGA-based implementation of speech recognition for robocar control using
           MFCC

    • Authors: Bayuaji Kurniadhani, Sugondo Hadiyoso, Suci Aulia, Rita Magdalena
      Abstract: This research proposes a simulation of the logic series of speech recognition on the MFCC (Mel Frequency Spread Spectrum) based FPGA and Euclidean Distance to control the robotic car motion. The speech known would be used as a command to operate the robotic car.  MFCC in this study was used in the feature extraction process, while Euclidean distance was applied in the feature classification process of each speech that later would be forwarded to the part of decision to give the control logic in robotic motor. The test that has been conducted showed that the logic series designed was precise here by measuring the Mel Frequency Warping and Power Cepstrum. With the achievement of logic design in this research proven with a comparison between the Matlab computation and Xilinx simulation, it enables to facilitate the researchers to continue its implementation to FPGA hardware.
      PubDate: 2019-08-01
      DOI: 10.12928/telkomnika.v17i4.12615
      Issue No: Vol. 17, No. 4 (2019)
       
  • Velocity Measurement based on Inertial Measuring Unit (IMU)

    • Authors: Waru Djuriatno, Eka Maulana, Hasan Hasan, Effendi Dodi Arisandi, Wijono Wijono
      Abstract: Vehicles technology have been a priority area of research over the last few decades. With the increasing the use of electronic components in the automotive industry to measure conditions around the vehicle, the focus of automotive technology development is now leading to the development of active technology. Information on the speed of conventional vehicles is generally still obtained based on the rotation of the wheel, but there are weakness in the system that is the diference between wheel and road through vehicle also changes wheel radius of the vehicle due to wind tube air preasure that can change at any time. In this research used Inertial Measuring Unit (IMU) 6 axis (accelerometer and gyroscope) which have been done filtering by using Kalman filter in order to make output sensor value more stable, results obtained at the test of 0 m/s had an RMS error of 0.8696 m/s when elevation is +450; 0.0393 m/s when elevation is 00; and 0.3030 m/s when elevation is -450. this research is expected to be an exploration for the development of a decent system that is suitable to be used as vehicle speed estimator which is as reliable as it is by using an existing speedometer on a ground vehicle generally regardless of slippage and changes in wind capacity on wheels.
      PubDate: 2019-08-01
      DOI: 10.12928/telkomnika.v17i4.11826
      Issue No: Vol. 17, No. 4 (2019)
       
  • Analyzing The Deformation Of Copper Conductor From A Fire Impact Caused By
           Electricity Using Sem-Eds And Micro-Xrf Instruments

    • Authors: Didik Notosudjono, Tatang Kukuh Wibawa, Bagus Dwi Ramadhon
      Abstract: Fire is an oxidation reaction of the three elements (fuel, oxygen, heat) that can result in loss of property, injury, even death. Electricity potential that may results on fire is the short circuit current that occurs on the equipments and electrical installation cables. The remaining wires at the first fire location are subject to fire damage and can cause electrical short circuit. The purpose of this study is to analyze the short-circuit electrical deformation of copper cable using SEM EDS and MICRO XRF instrument.
      Based on the study result, there is a dominant change of oxygen elements in single cable and fiber sample causing fire that is 35,96% and 21,24%, those values are higher than Oxygen on a burned short circuited cable that is 19,54% and 12,1%. The microstructure of the cable that causes fire looks like irregular clumps whereas the burned cable looks like a clump of clumps.
      PubDate: 2019-08-01
      DOI: 10.12928/telkomnika.v17i4.10116
      Issue No: Vol. 17, No. 4 (2019)
       
 
 
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