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Videoconference System for Rural Education: Issues, Challenges, and Solutions a Title is Fewest Possible Words

10.12928/telkomnika.v15i4.6291
Kusprasapta; Institut Teknologi Bandung, Indonesia Mutijarsa , Yoanes; Institut Teknologi Bandung, Indonesia Bandung , Luki Bangun; Institut Teknologi Bandung, Indonesia Subekti
In this paper, we presented issues, challenges, and solutions of videoconference system for rural education. First, we discussed several issues on the implementation of videoconference system for education, particulary in rural area in Indonesia, which covered videoconference requirement, rural condition, and education needs. Second, we presented several challenges consisted of choosing videoconference technology, choosing compression method, system and application development, ensuring quality of services, and ensuring quality of experiences. Based on the issues and challenges, we proposed a solution of videoconference system which is specifically deployed in rural education. The solution was based on WebRTC technology implemented in Intel i5 core miniPC choosen to increase portability of the system. A STUN server was built on Javascript to facilitate communication between each client terminal. A simple and intuitive user interface was designed to facilitate the use of application by rural people. The system was deployed at two elementary schools in Cianjur, West Java, representing rural education in Indonesia. From the experiment, we obtained video sent data rate 82 kbit/s, video received data rate 245 kbit/s, average delay 316 ms and packet lost rate 1.32%. The experiment results showed that the audio and video quality can be accepted by users to implement distance learning.
Volume: 15
Issue: 4
Page: 1901-1911
Publish at: 2017-12-01

Customers’ Perception Towards Services of Telecommunications Operators

10.11591/ijict.v6i3.pp146-154
Driss Ait Omar , Mohamed Baslam , Mourad Nachaoui , And Mohamed Fakir
Currently the operators in the telecommunications market present offers of subscription to the consumers,and given that competition is strong in this area, most of these advertising offers are prepared to attract and / or keep customers.For this reason, customers face problems in choosing operators that meet their needs in terms of price, quality of service (QoS), etc..., while taking into account the margin between what is advertising and what is real. Therefore, we are led to solve a problem of decision support. Mathematical modeling of this problem led to the solution of an inverse problem. Specifi-cally, the inverse problem is to find the real Quality of Service (QoS) function knowing the theoretical QoS. To solve this problem we have reformulated in an optimization problem of minimizing the difference between the real quality of service (QoS) and theoretical (QoS). This model will help customers who seek to know the degree of sincerity of Their operators, as well as it is an opportunity for operators who want to maintain their resources so that they gain the trust of customers. The resulting optimization problem is solved using evolutionary algorithms. The numerical results showed the reliability and credibility of our inverse model and the performance and effectiveness of our approach.
Volume: 6
Issue: 3
Page: 146-154
Publish at: 2017-12-01

A Comprehensive Survey on Comparisons across Contextual Pre-filtering, Contextual Post-filtering and Contextual Modelling Approaches

10.12928/telkomnika.v15i4.6875
Khalid; University of Malaya Bayero University, Malaysia Haruna , Maizatul; University of Malaya, Malaysia Akmar Ismail , Damiasih; Sekolah Tinggi Pariwisata Ambarrukmo, Indonesia Damiasih , Haruna; Federal College of Education (Technical) Gombe, Nigeria Chiroma , Tutut; Politeknik Negeri Malang Sekolah Tinggi Pariwisata Ambarrukmo Universitas Teknologi Yogyakarta, Indonesia Herawan
Recently, there has been growing interest in recommender systems (RS) and particularly in context-aware RS. Methods for generating context-aware recommendations are classified into pre-filtering, post-filtering and contextual modelling approaches. In this paper, we present the several novel approaches of the different variant of each of these three contextualization paradigms and present a complete survey on the state-of-the-art comparisons across them. We then identify the significant challenges that require being addressed by the current RS researchers, which will help academicians and practitioners in comparing these three approaches to select the best alternative according to their strategies.
Volume: 15
Issue: 4
Page: 1865-1874
Publish at: 2017-12-01

Combining Parameters of Fuel and Greenhouse Gas Costs as Single Objective Function for Optimization of Power Flow

10.12928/telkomnika.v15i4.5769
Ignatius; Universitas Sepuluh November Surabaya, Indonesia Riyadi Mardiyanto , Hermagasantos; Bandung State of Polytechnic, Indonesia Zein , Adi; Sepuluh November Institute of Technology, Indonesia Soeprijanto
The Kyoto Protocol is a protocol that highlights on greenhouse gases that have been adopted by many countries. 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 involved emission charges on the electricity system. This paper proposes a single objective function of amathematical model for the calculation of power flow optimization involving greenhouse gas emissions costs to the fuel cost function. The single objective function derived using the mathematical model approach with linear heat rate function, in order to get the relationship between the fuel cost function with GHG emission. Namely, the function of energy costs as a combination of fuel costs and GHG emission costs can be shown as a quadratic function.
Volume: 15
Issue: 4
Page: 1585-1600
Publish at: 2017-12-01

Modeling Ontology and Semantic Network of Regulations in Customs and Excise

10.12928/telkomnika.v15i4.6590
Eva Maulina; Bogor Agricultural University (IPB), Indonesia Aritonang , Kudang Boro; Bogor Agricultural University (IPB), Indonesia Seminar , Sri; Bogor Agricultural University (IPB), Indonesia Wahjuni , Onno Widodo; Surya University, Indonesia Purbo
Regulations in customs and Excise have an important function in regulating legally every policy and decision making. Thus, the type of rules are made varies according to the hierarchy of the regulator. This regulation is also changing, following policy developments that occured in the higgest government. then, what if this organization has not been able to manage its regulatory archiving? even regulatory changes can not be tracked? So, we need a well-organized system that can accomodate all of the rules and the associated changes and connectedness with other type of regulations. This system will help us to provide convenience to users to search, manage and track the history of changes as well as the relationship between the rules used by the organization. This paper propose the design of an ontology-based semantic network using a graph database that use neo4j 2.3.1 as a solution. In the application that uses the sample data, we found 13 types of nodes that contains 242 child nodes and 22 type of relation that contain 548 relation that connect all the node within 3305ms.
Volume: 15
Issue: 4
Page: 1929-1937
Publish at: 2017-12-01

Generating a Lighting System by Using Pico Hydro System

10.12928/telkomnika.v15i4.7235
G.; University of Technology and Innovation (APU), Malaysia Subhashini , Devindran; University of Technology and Innovation (APU), Malaysia Munandy , Raed; University of Technology and Innovation (APU), Malaysia Abdulla
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. 
Volume: 15
Issue: 4
Page: 1565-1573
Publish at: 2017-12-01

Canny Junk System based on IOT

10.11591/ijeecs.v8.i3.pp639-641
D. Wilfred Shiju
Waste organization is one of the fundamental issue that the world goes up against free of the case of made or making country. The key issue in the waste organization is that the junk canister at open spots stretches out beyond time some time as of late the start of the accompanying cleaning process. It is this way prompts distinctive dangers, for instance, horrendous aroma and disagreeableness to that place which may be the principle driver for spread of various afflictions. To avoid all such hazardous circumstance and keep up open cleanliness also, prosperity this work is mounted on a splendid decline structure. The guideline subject of the work is to develop a sagacious astute deny prepared structure for a real junk organization .This paper proposes a smart prepared structure for junk space by giving an alert banner to the common web server for minute cleaning of dustbin with honest to goodness check based on level of waste filling. This technique is bolstered by the ultrasonic sensor which is interfaced with Arduino UNO to check the level of waste filled in the dustbin and sends the alert to the common web server once if waste is filled. 
Volume: 8
Issue: 3
Page: 639-641
Publish at: 2017-12-01

Overdriven Characteristics of Silica Switching Devices

10.12928/telkomnika.v15i4.6457
Ary; University al Azhar Indonesia, Indonesia Syahriar , Nabil Rayhan; Bandung Institute of Technology, Indonesia Syahriar , Jusman Syafiie; University al Azhar Indonesia, Indonesia Djamal
We have built and characterized silica on silicon switching devices fabricated by using the electron beam irradiation. It is based on Mach-Zehnder structure fabricated on silica on silicon layers where the upper cladding used the MgF2 layers to bury the core. The switching speed of 2.0 s has been achieved. To further increase the switching speed we have used larger voltage to the Ti heating electrode to increase the thermo optics effects on silica structures. The higher driving voltage have been used that falls to zero exactly as the first extinction is reached, therefore three fold increase in modulation speed is achieved.
Volume: 15
Issue: 4
Page: 1682-1688
Publish at: 2017-12-01

New Watermarking/Encryption Method for Medical Imaging FULL Protection in m-Health

10.11591/ijece.v7i6.pp3385-3394
Mohamed Boussif , Nourredinne Aloui , Adnene Cherif
In this paper, we present a new method for medical images security dedicated to m-Health based on a combination between a novel semi reversible watermarking approach robust to JPEG compression, a new proposed fragile watermarking and a new proposed encryption algorithm. The purpose of the combination of these three proposed algorithms (encryption, robust and fragile watermarking) is to ensure the full protection of medical image, its information and its report in terms of confidentiality and reliability (authentication and integrity). A hardware implementation to evaluate our system is done using the Texas instrument C6416 DSK card by converting m-files to C/C++ using MATLAB coder. Our m-health security system is then run on the android platform. Experimental results show that the proposed algorithm can achieve high security with good performance.
Volume: 7
Issue: 6
Page: 3385-3394
Publish at: 2017-12-01

Performance Analysis of Data Traffic Offload Scheme on Long Term Evolution and IEEE 802.11AH

10.12928/telkomnika.v15i4.6033
Made Adi Paramartha; Telkom University, Indonesia Putra , Doan; Telkom University, Indonesia Perdana , Ridha Muldina; Telkom University, Indonesia Negara
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%.
Volume: 15
Issue: 4
Page: 1659-1665
Publish at: 2017-12-01

A New Dual Band Printed Metamaterial Antenna for RFID Reader Applications

10.11591/ijece.v7i6.pp3507-3514
Abdelhadi Ennajih , Jamal Zbitou , Mohamed Latrach , Ahmed Errkik , Rachid Mandry
In this paper, we present a new dual band metamaterial printed antenna for radio frequency identification applications. The proposed antenna consists of two L-shaped slot in the radiating element for dual band operation and a complementary split ring resonator etched from the ground plane for size miniaturization. This antenna is designed and optimized by CST microwave studio on FR-4 substrate with thickness of 1.6 mm, dielectric constant of 4.4 and tangent loss of 0.025. A microstrip line with characteristic impedance of 50 ohms is used to feed this antenna. A prototype of the proposed antenna is fabricated to validate the simulation results. The measured and simulated results are in good agreement. 
Volume: 7
Issue: 6
Page: 3507-3514
Publish at: 2017-12-01

Having Children with Mental Retardation

10.11591/ijphs.v6i4.10779
Sri Endriyani , Yunike Yunike
Mental Retardation is a condition in which the intelegency function is under average, which began during the developmental period. Children with mentally retarded have limited mental function, communication skills, ability to maintain themselves and social skills. These conditions impact the mothes’s they responsible to train children’s ability to be independent. The purpose of this study is to explore the mothers’ experience having children with mental retardation at Special School for mentally retarded (SLB) of Karya Ibu Palembang, Indonesia. This is a qualitative research with fenomenology approach from five partisipants with indept interview. Five themes were get including can’t accept reality, burden, the social stigma,need support from relatives, worry about the future, and admitting God’s will. The Adaptation behaviors found in this study are the acceptance of children’s condition, and loving the children thoroughly.
Volume: 6
Issue: 4
Page: 331-336
Publish at: 2017-12-01

Underwater Image Enhancement Using Histogram Method

10.11591/ijeecs.v8.i3.pp687-689
J. Brindha , V. Vijayakumar
The underwater images not only offer aninteresting sight, but also have a challenge to monitor marinespecies and underwater activities. Taking a beautiful underwater image requires extraordinary equipment and technique. Usually,there are distorted colors on the image caused by poor light andwater quality. So it requires an image enhancement process to geta proper photo to display. This research offers an improvedmethod of auto levels to produce stunning photos. This methoduses the color balancing based on the distribution of each channelR, G and B based on its histogram. The balancing of colors willreproduce colors more attractive compared with other methodsof auto level.
Volume: 8
Issue: 3
Page: 687-689
Publish at: 2017-12-01

The Effective Optimization Methods of Port Activity on the Basis of Algorithmic Model

10.11591/ijece.v7i6.pp3578-3582
A. Nyrkov , A. Shnurenko , S. Sokolov , S. Chernyi , V. Korotkov
The article considers the inland waterways (IW) within the international transport corridors as multiphase systems of mass service (SMS) and shows the distinction in calculation of the important indicator of system efficiency - the average total waiting time of vessel service in the serving subsystems, the application of genetic algorithms to increase the efficiency of reloading processes.
Volume: 7
Issue: 6
Page: 3578-3582
Publish at: 2017-12-01

250 MHz Multiphase Delay Locked Loop for Low Power Applications

10.11591/ijece.v7i6.pp3323-3331
Shruti Suman , K. G. Sharma , P. K. Ghosh
Delay locked loop is a critical building block of high speed synchronous circuits. An improved architecture of amixed signaldelay locked loop (DLL) is presented here. In this DLL, delay cell based on single ended differential pair configuration is used for voltage controlled delay line (VCDL) implementation. This delay cell provides a high locking range with less phase noise and jitter due to differential pair configuration.For increasing the acquisition range and locking speed of the DLL, modified true single phase clock (TSPC) based phase frequency detector is used. The proposed design is implemented at 0.18 um CMOS technology and at power supply of 1.8V . It has power consumption of 1.39 mW at 125 MHz center frequency with locking range from 0.5 MHz to 250 MHz.
Volume: 7
Issue: 6
Page: 3323-3331
Publish at: 2017-12-01
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