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The use of mobile-assisted virtual reality in fear of darkness therapy

10.12928/telkomnika.v17i1.11614
Erick; Universitas Padjadjaran Paulus , Mira; Universitas Padjadjaran Suryani , Puspita Adhi Kusuma; Universitas Padjadjaran Wijayanti , Firdaus Perdana; Universitas Padjadjaran Yusuf , Aulia; Universitas Padjadjaran Iskandarsyah
Fear of darkness is a common psychological problem that may extent to a specific phobia if it is not treated well. Several intervention techniques related to fear and phobia using actual exposure therapy have been studied for decades, however, there were some constraints emerged when the therapist provides a real environment to overcome the patient's reaction to his/her specific fear. Virtual reality (VR) technology is an innovative tool providing a more immersive, secure, personal, and controlled virtual environment. Therefore, we developed a novel framework for treating the fear of darkness named Mobile-assisted Virtual Reality (MAVR). The purpose of this study was to evaluate the use of MAVR to treat fear of darkness based on usability, time consumption and its ability to decrease fear. We used the GOMS model as an interaction guidance between human and computer which aimed to facilitate the process of re-learning in mindset change and individual’s behavioral toward situation of darkness and night. Therefore, a comprehensive evaluation was conducted to measure the efficacy of the MAVR. We developed the usability assessment checklist to assess the feasibility and acceptability of the MAVR, and fear of darkness thermometer to measure the degree of fear. The Wilcoxon Signed Rank Test showed that the fear of darkness was significantly decreased after participants received the MAVR therapy (z=-3.550, p-value<0.001). We found that the MAVR was very useful, easy to be used and acceptable for participants. In conclusion, this study highlights the efficacy of Mobile-assisted Virtual Reality in treating specific fear, and it seems that Virtual Reality technology has a promising benefit to be implemented for other fear or specific phobia and also used in other psychological treatment.
Volume: 17
Issue: 1
Page: 282-290
Publish at: 2019-02-01

Evaluation of network security based on next generation intrusion prevention system

10.12928/telkomnika.v17i1.9191
Gilang Intan Permatasari; Bina Nusantara University Duppa , Nico; Bina Nusantara University Surantha
Next Generation Intrusion Prevention System (NGIPS) is a system that works to monitor network traffic, to detect suspicious activity, and to conduct early prevention toward intrusion that can cause network does not run as it supposed to be, NGIPS provides vulnerability protection broader compared to the traditional IPS, especially in the application layer that has ability to detect and learn vulnerability asset and carried out layering inspection until layer 7 packet. This paper intended to analyze and evaluate the NGIPS to protect network from penetration system that utilize the weakness from firewall, that is exploitation to HTTP port. By the existence of NGIPS, it is expected can improve the network security, also network administrator could monitor and detect the threats rapidly. Research method includes scenario and topology penetration testing plan. The result of this research is the evaluation of penetration testing that utilizes HTTP port to exploit through malicious domain. The evaluation conducted to ensure the NGIPS system can secure the network environment through penetration testing. This study can be concluded that it can become reference to optimize network security with NGIPS as network security layer.
Volume: 17
Issue: 1
Page: 39-48
Publish at: 2019-02-01

Single-layer performance of sugarcane bagasse- and rubber tire dust microwave absorber in narrow band frequency of 3.85 GHz to 8.2 GHz

10.11591/ijeecs.v13.i2.pp737-743
L. Zahid , M. Jusoh , N. H. Ghazali , Sabapathy Sabapathy , M. Mustapa , A. K Rahman
In this paper, the single and flat layer of microwave absorber has been fabricated with different weight percentage of sugarcane bagasse (SCB) and rubber tire dust (RTD). The dielectric properties and wave propagation have been investigated in this work. There are two different designs in developing this layer of microwave absorber. In this work, the targeted frequency is within 3.85 GHz to 8.2 GHz. The preference was based on the fact that our goal was to achieve minimum backward reflections, and the sugarcane bagasse material, with its low dielectric constant, high loss factor, large attenuation per unit length, and ease of fabrication, provided a better opportunity to achieve that goal which is better than -10dB (90 % of absorption).
Volume: 13
Issue: 2
Page: 737-743
Publish at: 2019-02-01

2.45 GHz rectenna with high gain for RF energy harvesting

10.12928/telkomnika.v17i1.11592
Maizatul Alice Meor; Universiti Teknikal Malaysia Melaka (UTeM) Said , Zahriladha; Universiti Teknikal Malaysia Melaka (UTeM) Zakaria , Mohd Nor; Universiti Teknikal Malaysia Melaka (UTeM) Husain , Mohamad Harris; Universiti Teknikal Malaysia Melaka (UTeM) Misran , Faza Syahirah Mohd; Universiti Teknikal Malaysia Melaka (UTeM) Noor
This paper presents a high gain rectenna at 2.45 GHz. Two layers low cost FR4 substrate has been used with air-gap technology for this fabricated rectenna. The proposed designs contain antenna and  open stub rectifying circuits with feedline. With the dimension of 100 x 100 x 5 mm3, this rectenna can perform high gain. The technique of air gap approach has been used for this proposed rectenna design so as to increase the antenna gain. Second and third harmonics has been eliminated by the introducing of triangular slot and ground plane to the developed design. The proposed rectenna successfully achieved the output voltages reaches 0.46 V when the input power is 0 dBm respectively when  the input power range is between -25 to 30 dBm. It is also can reach up to 6V when the maximum input power is applied. High gain, simple design, low profile and easy integration are the main advantages of this design of the rectenna when compared to past researchers.
Volume: 17
Issue: 1
Page: 384-391
Publish at: 2019-02-01

Energy scavenging using vibrations from bluetooth controlled DC motor

10.12928/telkomnika.v17i1.11638
Ankita H; Shri Ramdeobaba College Harkare , Sagar; Shri Ramdeobaba College Welekar , Abhishek; Shri Ramdeobaba College Maheshwari , Suraj; Shri Ramdeobaba College Motwani , Saket; Shri Ramdeobaba College Soholkar
Wide spectrum of research for application-based solutions has grown due to the requirement of automation of general electrical appliances. A low-cost solution is presented in this paper to control DC motor using Bluetooth module and controlled by an ARM processor. The main objective here is to build an efficient closed loop system which is wirelessly controlled by ARM processor 2103 using Bluetooth module and Bluetooth dongle. The system suggested here is expandable and can be integrated with latest technologies as well. The paper gives the details of the prototype for home automation system and gives the expected results with 0.1% tolerance. It also suggests the ways to integrate this system with the mobile phones and hence control the devices with the mobile handsets. The vibration frequency of the DC motor is used to generate electrical potential using MEMS tecnonlogy. A novel idea of self powered DC motor is thus presented by installing MEMS based energy harvester on the motor shaft.
Volume: 17
Issue: 1
Page: 481-488
Publish at: 2019-02-01

Optimization of video quality via fuzzy logic base adaptive media playout

10.11591/ijeecs.v13.i2.pp527-533
Farij Ehtiba , Badlishah Ahmad , Mostafijur Rahman
This paper addresses the issue of interruption of Virable Bit Rate (VBR) video streaming over IP network, due to channel quality fluctuation. Specifically, a Fuzzy Logic (FL) Control principle is fused with Adaptive Media Playout (AMP) control to estimate an appropriate playout frame rate, namely FLAMP. Based on the estimation of the playout frame rate, the FLAMP algorithm adjusts the consumption rate smoothly to avoid video stream degradation. Simulation results validate that the FLAMP scheme efficiently reduces the buffer outage probability and provides better visual quality where FLAMP gives 26.5% less ferquence of playout interruption, and 21.6% less variance of distortion of playout as compared to APTA.
Volume: 13
Issue: 2
Page: 527-533
Publish at: 2019-02-01

Research, design and fabrication of a microwave active filter for nanosatellite’s receiver front-ends at s-band

10.12928/telkomnika.v17i1.10079
Linh Ta; Ministry of Science and Technology Phuong , Bernard; ENS Paris-Saclay Journet , Duong Bach; VNU University of Engineering and Technology Gia
In satellite technology, the communication between space segment and ground segment plays a vital role in the success of the mission. This paper is targeted at study, design and fabrication of a microwave active filter for the receiver front-ends using coupled line filter structure, which can be applied to the nanosatellite’s communication subsystem. The whole active filter module is a combination of a microstrip bandpass filter and a preceding two-stage wideband low noise amplifier using FET devices. The proposed module operates in the frequency range of 2-2.4 GHz, which can be divided to 10 frequency slots of about 40 MHz for each. These frequency slots will be used for the S-band multi-frequency receiving function of the ground station, as well as the nanosatellite. The simulated and measured results of this active filter configuration are presented.
Volume: 17
Issue: 1
Page: 23-31
Publish at: 2019-02-01

The design of smart notification on android gadget for academic announcement

10.12928/telkomnika.v17i1.10245
Agustina; Universitas Indo Global Mandiri Heryati , Evi; Universitas Indo Global Mandiri Yulianti , Faradillah; Universitas Indo Global Mandiri Faradillah , Dewi; Universitas Indo Global Mandiri Sartika , Dhamayanti; Universitas Indo Global Mandiri Dhamayanti , Imelda; Universitas Indo Global Mandiri Saluza , Ahmad; Universitas Indo Global Mandiri Sanmorino
In this article, we try to design the architecture of a smart notification system using an Android gadget for academic notification in college. Academic notification in colleges now utilizes bulletin boards and online media such as websites or social media. The problem faced is the high cost and resources required to deliver the academic notification. Another problem is whether the information delivered can be right to the students who need it. We proposed the architecture of a smart notification system that can reduce the cost, and the information delivered can be right on target to the students in need.
Volume: 17
Issue: 1
Page: 147-152
Publish at: 2019-02-01

The influence of sampling frequency on tone recognition of musical instruments

10.12928/telkomnika.v17i1.11608
Linggo; Sanata Dharma University Sumarno , Kuntoro; Sanata Dharma University Adi
Sampling frequency of musical instruments tone recognition generally follows the Shannon sampling theorem. This paper explores the influence of sampling frequency that does not follow the Shannon sampling theorem, in the tone recognition system using segment averaging for feature extraction and template matching for classification. The musical instruments we used were bellyra, flute, and pianica, where each of them represented a musical instrument that had one, a few, and many significant local peaks in the Discrete Fourier Transform (DFT) domain. Based on our experiments, until the sampling frequency is as low as 312 Hz, recognition rate performance of bellyra and flute tones were influenced a little since it reduced in the range of 5%. However, recognition rate performance of pianica tones was not influenced by that sampling frequency. Therefore, if that kind of reduced recognition rate could be accepted, the sampling frequency as low as 312 Hz could be used for tone recognition of musical instruments.
Volume: 17
Issue: 1
Page: 253-260
Publish at: 2019-02-01

Speed limiter integrated fatigue analyzer (SLIFA): engineering design and concept

10.12928/telkomnika.v17i1.8249
Hadi; Mercubuana University Pranoto , A.M.; University Tun Hussein Onn Malaysia [UTHM] Leman , Fajar; Mercubuana University Anggara , Muhammad; Mercubuana University Kholil
Main issue in urban transportation system is traffic accident which caused by several factors where there are two factors that has a significant contribution in accident are overspeed and fatigue. Therefore, main objective of this research is to develop Speed Limiter Integrated Analyzer (SLIFA). This device will be controlling the speed by cutting off the fuel supply to the engine when driver's fatigue or speed are beyond limitation. This research was consists of four steps which are Step 1 is study literature on types of vehicle. Step 2, detail engineering design that is focused in this research. Step 3 is describing the target of SLIFA installation. Step 4 is fabricating and testing of SLIFA on truck and bus in range of July 2017 to January 2018. The result shows the appropriate voltage for speed at 70 km/h is 10.7 volt for limiting the speed. The traffic accident has succesfully decreased up to 47% after SLIFA installed on truck and bus. It can be concluded that the SLIFA application on transportation especially on truck and bus was very recommended to reduce traffic accident and play an appropriate government regulation.
Volume: 17
Issue: 1
Page: 508-520
Publish at: 2019-02-01

Design and fabrication of A Ku-band low noise amplifier using FR-4 substrate

10.12928/telkomnika.v18i1.13196
Linh; Ministry of Science and Technology Ta Phuong , Bernard; LPQM (CNRS UMR-8537) École normale supérieure Paris-Saclay, CentraleSupelec, Université Paris-Saclay, France Journet , Duong; VNU University of Engineering and Technology Bach Gia
The low noise amplifier (LNA) plays an important role in many communication systems, especially at the receiver’s front-ends. In modern RF designs, The LNA is usually fabricated on a microstrip printed circuit board (PCB) due to its simplicity and ability of integrating flexibly with other components in a receiving circuitry unit. At frequencies lower than 6 GHz, the most prevalent substrate material for a microstrip LNA is FR-4 while at higher frequencies of over 10 GHz, it is challenging to design the LNA using this material without causing considerable losses to the RF signal. There are many works related to design microstrip LNA at high frequencies, however, the dielectric substrates used in most of them were high-cost materials for low dielectric loss. This paper introduces an LNA topology using the common, low-cost FR-4 substrate which can be operated in Ku-band for applications such as small satellites’ receivers, with the expected noise figure of lower than 1 dB, gain of around 10 dB and the return loss of around -10 dB. The stepped impedance matching technique has been used for transmission line optimization. The simulated and measured results are presented.
Volume: 18
Issue: 1
Page: 552-561
Publish at: 2019-02-01

Blood image analysis to detect malaria using filtering image edges and classification

10.12928/telkomnika.v17i1.11586
Murk Hassan; Mehran University Memon , Tariq Jamil Saifullah; Mehran University Khanzada , Sheeraz; Mehran University Memon , Syed Raheel; King Abdulaziz University Hassan
Malaria is a most dangerous mosquito borne disease and its infection spread through the infected mosquito. It especially affects the pregnant females and Children less than 5 years age. Malarial species commonly occur in five different shapes, Therefore, to avoid this crucial disease the contemporary researchers have proposed image analysis based solutions to mitigate this death causing disease. In this work, we propose diagnosis algorithm for malaria which is implemented for testing and evaluation in Matlab. We use Filtering and classification along with median filter and SVM classifier. Our proposed method identifies the infected cells from rest of blood images. The Median filtering smoothing technique is used to remove the noise. The feature vectors have been proposed to find out the abnormalities in blood cells. Feature vectors include (Form factor, measurement of roundness, shape, count total number of red cells and parasites). Primary aim of this research is to diagnose malaria by finding out infected cells. However, many techniques and algorithm have been implemented in this field using image processing but accuracy is not up to the point. Our proposed algorithm got more efficient results along with high accuracy as compared to NCC and Fuzzy classifier used by the researchers recently.
Volume: 17
Issue: 1
Page: 194-201
Publish at: 2019-02-01

Low latency and energy efficient cluster based routing design for wireless sensor network

10.11591/ijeecs.v13.i2.pp615-625
Basavaraj G.N , Jaidhar C.D
Wireless sensor network (WSN) has attained wide adoption across various sectors and is considered to be key component of future real-time application such as BigData, Internet of things (IoT) etc. The modern application requires low latency and scalable real-time data access considering heterogeneous network. However, provisioning low latency real-time data access incurs energy overhead among sensor device. Clustering technique aided in providing scalability and minimizing energy consumption among sensor device. However, it incurs energy overhead among cluster head and sensor device closer to sink. To address, many optimization technique is been presented in recent time for optimal cluster selection. However, these technique are designed considering homogenous network. To address, this work presented low latency and energy efficient routing (LLEER) design for heterogeneous WSN. The LLEER adopts multi-objective function such asconnectivity, connection time, radio signal strength, coverage time, and network traffic for cluster head and hop node selection. Experiment are conducted to evaluate LLEER design shows significant performance improvement over state-of-art model in terms of network lifetime considering total node death, first node death, and loss of connectivity, communication overhead, and packet transmission latency. Proposed LLEER brings a good trade-off between energy efficiency, and latency requirement of future real-time application.  
Volume: 13
Issue: 2
Page: 615-625
Publish at: 2019-02-01

Frequency tuning varactor-loaded reconfigurable antenna for m-WiMAX and WLAN applications

10.11591/ijeecs.v13.i2.pp779-786
S. M. Shah , K. Hamdan , Z. Z. Abidin , F. C. Seman , S. A. Hamzah , N. Katiran , F. Zubir
A design approach for a microstrip patch antenna to achieve the reconfigurable dual-band operation with a tunable device is presented in this work. The approach uses a BB833 varactor diode in the middle of a slotted patch antenna which which is able to produce dual-band resonant frequencies. The reconfigurable antenna is designed and simulated in CST Microwave Studio® software and is later, fabricated on a FR-4 substrate with a dielectric constant,  of 4.5, loss tangent, tan δ of 0.019 and thickness, h of 1.6 mm. By changing the DC voltages of the varactor diode, different capacitance values of the varactor diode are obtained which dictate the specific resonant frequencies. From the simulation results, the capacitance value of 0.5 pF with a bias voltage of 2.0 V is chosen as it produces the required dual-band resonant frequencies at 3.38 GHz and 5.37 GHz for desired applications in the m-WiMAX and WLAN bands.
Volume: 13
Issue: 2
Page: 779-786
Publish at: 2019-02-01

An idea of intuitive mobile diopter calculator for myopia patient

10.12928/telkomnika.v17i1.11623
Komang Candra; Brawijaya University Brata , Mukhammad Sharif; Brawijaya University Hidayatulloh
The diopter is the unit of measurement for the refractive power of a lens. Myopia is a form of refractive error which is a leading cause of visual disability throughout the world. The prevailing treatment of refractive errors which are commonly used in daily life are glasses and contact lenses. Although those methods can overcome myopia, many myopia patients still don’t really know how to measure their current refractive error in diopter. This condition may retard the progression of refractive treatment in the myopic individual. The common methods to measure refractive error are phoropter with Snellen chart and retinoscopy, but those expensive tools need expertise to operate. This paper presents the concept of measure the face to smartphone screen distance to provide the possibility to implement a mobile application as a low-cost alternative refractive measurement tool. The main objective is to investigate the feasibility of mobile application to help patients with myopia measuring their blur line distances and evaluate their diopter levels independently. The experimental results reveal that, with 80.5 usability score the overall functionality of proposed application can be categorized as usable to users and feasible for future implementation.
Volume: 17
Issue: 1
Page: 307-313
Publish at: 2019-02-01
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