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29,082 Article Results

Usability Analysis of Business Intelligence Tool Based Table Virtualization

10.11591/ijeecs.v9.i2.pp431-437
Muh Zia ul Haq , Suharjito Suharjito
The use of Business Intelligence for Small-Mid Enterprise (SME) no longer impeded by the size of the resources required. The study in this paper provides an overview of how the use of proposed software can be used as an effective and efficient alternative solution in building BI Tools combined with table virtualization utilization in SQL. To know the level of usability and suitability of the developed BI Tool, the researcher conducted evaluation and analyzation using 2 (two) tools (Heuristics Evaluation and UMUX-Lite). The result found the comparison between the output (Business Intelligence Tool) produced by PHP Report Maker has a better level of usability and suitability than its competitors. Although both are in a decent median, the output needs preferences and customizations to achieve maximum functionality like well-known other development software. 
Volume: 9
Issue: 2
Page: 431-437
Publish at: 2018-02-01

Effective Sampling-Based Assessment Method for Evaluating Electrical Engineering Programme Performance

10.11591/ijeecs.v9.i2.pp417-423
W. Mansor , B. N. Sheikh Rahimullah , M. N. Taib , N. Mohamad Zaini , M. F. Abdul Latip , A. R. Mahmud
Challenges in the conventional way of measuring programme outcome include large data sets to be processed, a large amount of manpower, operating cost increment and time consuming. A sampling-based approach to evaluate the performance of a programme is proposed and a mathematical model is developed to determine the overall programme outcome score. The criteria for course selection and percentage of students considered in the assessment, was designed to accelerate the process. The results obtained from the implementation of sampling based approach in the assessment have shown that the programme is successful and the students have achieved the required knowledge and skills. The sampling-based approach is capable of demonstrating the programme and the students’ achievement.
Volume: 9
Issue: 2
Page: 417-423
Publish at: 2018-02-01

Design and Implementation of Smart Non-Invasive Bone Conduction Ear-Plug System

10.11591/ijeecs.v9.i2.pp249-252
Ravichandran G , M Krishnamurthy
The project aim is to design a smart earplug system integrated with non-invasive bone conduction technique which is capable of doing some advanced audio processing to provide voice enhancing, noise filtered audio for the hearing impaired people [2]. The system is also designed to work as an embedded music player, a life activity tracker and a Smartphone companion. It can even read the SMS that is just received on your smartphone into your ear. This project needs a very low power microcontroller but with high-performance signal processing requirements. STM32L476 from STMicroelectronics meets this needs and thus chosen as the main MCU. It is an ultra-low power ARM Cortex-M4 based microcontroller that can run up to 80MHz.  It has got 1MB of Flash memory and 128 KB RAM.
Volume: 9
Issue: 2
Page: 249-252
Publish at: 2018-02-01

Influence Types of Startup on Hydrothermal Scheduling

10.12928/telkomnika.v16i1.6722
Ignatius Riyadi; Institut Teknologi Sepuluh November Surabaya Mardiyanto , Hermagasantos; Politeknik Negeri Bandung Zein , Adi; Institut Teknologi Sepuluh November Surabaya Soeprijanto
The energy costs of a power plant consist of startup cost and cost of power usage. In contrast to the existing literature, this study introduces at startup cost based on the duration of thermal power plant downtime. The approach of startup cost function in this research is done by using startup type. Startup of a steam power plant depends on its condition. Generally, there are three types of startup the power plant when the turbine temperature is still very high, i.e. hot start, very hot start and very-very hot start. This paper uses multistage optimization to solve the problem of hydrothermal scheduling with including the startup type cost in the objective function. The simulation results showed operating cost savings when the objective function for optimization also consider the cost based on startup type i.e. when compared with the optimization result which the objective function does not take the cost of startup type.
Volume: 16
Issue: 1
Page: 25-37
Publish at: 2018-02-01

Reversed-Trellis Tail-Biting Convolutional Code (RT-TBCC) Decoder Architecture Design for LTE

10.11591/ijece.v8i1.pp198-209
Trio Adiono , Ahmad Zaky Ramdani , Rachmad Vidya Wicaksana Putra
Tail-biting convolutional codes (TBCC) have been extensively applied in communication systems. This method is implemented by replacing the fixed-tail with tail-biting data. This concept is needed to achieve an effective decoding computation. Unfortunately, it makes the decoding computation becomes more complex. Hence, several algorithms have been developed to overcome this issue in which most of them are implemented iteratively with uncertain number of iteration. In this paper, we propose a VLSI architecture to implement our proposed reversed-trellis TBCC (RT-TBCC) algorithm. This algorithm is designed by modifying direct-terminating maximum-likelihood (ML) decoding process to achieve better correction rate. The purpose is to offer an alternative solution for tail-biting convolutional code decoding process with less number of computation compared to the existing solution. The proposed architecture has been evaluated for LTE standard and it significantly reduces the computational time and resources compared to the existing direct-terminating ML decoder. For evaluations on functionality and Bit Error Rate (BER) analysis, several simulations, System-on-Chip (SoC) implementation and synthesis in FPGA are performed.
Volume: 8
Issue: 1
Page: 198-209
Publish at: 2018-02-01

NO2 Gas Sensing Properties of Carbon Films Fabricated by Arc Discharge Methane Decomposition Technique

10.12928/telkomnika.v16i1.6004
Elnaz; Universiti Teknologi Malaysia Akbari , Zolkafle; Universiti Teknologi Malaysia Buntat , Syed Muhammad; Universiti Teknologi Malaysia Zafar Iqbal , Zulkifli; Universiti Teknologi Malaysia Azman , Norain; Universiti Teknologi Malaysia Sahari , Zainuddin; Universitas Sriwijaya Nawawi , Muhammad Irfan; Universitas Sriwijaya Jambak , Muhammad Abu Bakar; Universitas Sriwijaya Sidik
In this work, a set of experiments has been conducted using arc discharge Methane decomposition attempting to obtain carbonaceous materials (C-strands) formed between graphite electrodes. The current-voltage (I-V) characteristics of the fabricated C-strands have been investigated in the presence and absence of two different gases, NO2 and CO2. The results reveal that the current passing through the carbon films increases when the concentrations of gases are increased from 200 to 800 ppm. This phenomenon is a result of conductance changes and can be employed in sensing applications such as gas sensors.
Volume: 16
Issue: 1
Page: 69-76
Publish at: 2018-02-01

MCGDM with AHP based on Adaptive Interval Value Fuzzy

10.12928/telkomnika.v16i1.7000
Yeni; University of Trunojoyo Madura Kustiyahningsih , Fatmawati; Airlangga University Fatmawati , Herry; Airlangga University Suprijanto
The purpose research is to develop the decision model of Multi-Criteria Group Decision Making (MCGDM) into Interval Value Fuzzy Multi-Criteria Group Decision Making (IV-FMCGDM), while the specific purpose is to construct decision-making model of Adaptive Interval Value Fuzzy Analytic Hierarchy Process (AIV- FAHP) uses Triangular Fuzzy Number (TFN) and group decision aggregation functions using Interval Value Geometric Means Aggregation (IV-GMA). The novelty research is to study the concept of group decision making by improving the middle point on the Interval Value Triangular Fuzzy Number (IV TFN). It provides more accurate modeling, and better rating performance, and more effective linguistic representation. This research produced a new decision-making model and algorithm based on AIV-FAHP used to measure the quality of e-learning.
Volume: 16
Issue: 1
Page: 314-322
Publish at: 2018-02-01

Fibre Optic Infrastructure for Network Deployment Using Application System

10.11591/ijeecs.v9.i2.pp311-315
Saravanan K , V Mathivananr
Fiber optic has an imperative part in the improvement of media communications framework in Indonesia. Better system execution and nature of the speed that offered by fiber optic can bolster the information prerequisite which keeps on expanding each year. In Indonesia, Fiber Optics is utilized as the essential system foundation Backbone and Access and still keep on developing the fiber optic system in Indonesia. Therefore, the process of reporting, controlling and monitoring are imperative for network deployment of fiber optic network by using an application system to be more efficient and accelerate the decision making process. In this study FOMApps is made, an android based application that facilitates the requirements of monitoring, controlling and reporting the fiber optic project between the Government and fiber optic deployment provider. Specifically, FOMApps incorporate distinctive announcing positions for each sort of employment. The test aftereffects of detailing framework Optical Fiber Cable (Outside Plant) has a speed in conveying the report added up to 257.516 seconds. So from the outcomes that are acquired, the application is plausible for use in detailing the arrangement of Outside Plant Fiber Optic. With the presence of this application, we expect the way toward controlling and checking between the Government and fiber optic organizations suppliers are accomplished.
Volume: 9
Issue: 2
Page: 311-315
Publish at: 2018-02-01

An Automatic Approach for Bilingual Tuberculosis Ontology Based on Ontology Design Patterns (ODPs)

10.12928/telkomnika.v16i1.6587
Bambang; Sebelas Maret University Harjito , Denis Eka; Sebelas Maret University Cahyani , Afrizal; Sebelas Maret University Doewes
Ontology is a representation term used to describe and represent a domain of knowledge. Manually ontology development is currently considered complex, requiring a lot of time and effort. This research was proposed to develop methods to build automatic domain ontology bilingual in Indonesian and English by using corpus and ontology design patterns (ODPs) in tuberculosis disease. In this study, the methods used were to combine ontology learning from text and ontology design patterns to decrease the role of expert knowledge. The methods in this research consist of six stages are term and relation extraction, matching with Tuberculosis glossary, matching with ODPs, score computation similarity term and relations with ODPs, ontology building and ontology evaluation. The results of ontology construction were 362 terms and 44 relations with 260 terms were added. The calculation accuracy of ontology construction was 71%. Ontology construction had higher complexity and shorter time as well as decreases the role of the expert knowledge which proof that the automatic ontology evaluation is better than manual ontology construction.
Volume: 16
Issue: 1
Page: 282-289
Publish at: 2018-02-01

The Locator Framework for Detecting Movement Indoors

10.12928/telkomnika.v16i1.7393
Kevin; Ulster University Curran
There are many advantages to being able to track in real-time the movement of things or humans. This is especially important in tracking goods in the supply chain, in security and also in health and safety. The Global Positioning Satellite (GPS) system works well in outdoor environments but it cannot track items indoors. There is also the problem of power hungry sensor chips inherent in some GPS trackers. Mobile Cellular triangulation also works well for many outdoor solutions but problems with cost, accuracy and reliability make it difficult to deploy for indoor tracking scenarions. The levels of accuracy can vary by up to 50 meters which hinder its ability for adoption in many use case scenarios. There are also problems with poor cellular coverage in rural areas. Solutions built on WiFi–the IEEE 802.11 standard overcome many of these issues. WiFi location tracking works via sampling of the received signal strength (RSS) which along with triangulation and prior mapping allows systems to locate items or humans with fine-granularity. This WiFi fingerprinting is a viable cost-effective approach to determining movement within indoor enviroments. This paper presents an overview of popular techniques and off-the-shelf solutions which can be used to determine movement of people and objects indoors. We outline the Locator frameworks which is built on both active and passive indoor localisation techniques for tracking movement within indoor environments.
Volume: 16
Issue: 1
Page: 390-401
Publish at: 2018-02-01

Estimating Parameter of Nonlinear Bias Correction Method Using NSGA-II in Daily Precipitation Data

10.12928/telkomnika.v16i1.6848
Angga Wahyu; Bogor Agricultural University Pratama , Agus; Bogor Agricultural University Buono , Rahmat; Bogor Agricultural University Hidayat , Hastuadi; Bogor Agricultural University Harsa
Nonlinear (NL) method is the most effective bias correction method for correcting statistical bias when observation precipitation data can not be approximated using gamma distribution. Since NL method only adjusts mean and variance, it does not perform well in handling bias on quantile values. This paperpresents a scheme of NL method with additional condition aiming to mitigate bias on quantile values. Non-dominated Sorting Genetic Algorithm II (NSGA-II) was applied to estimate parameter of NL method. Furthermore, to investigate suitability of application of NSGA-II, we performed Single Objective Genetic Algorithm (SOGA) as a comparison. The experiment results revealed NSGA-II was suitable when solution of SOGA produced low fitness. Application of NSGA-II could minimize impact of daily bias correction on monthly precipitation. The proposed scheme successfully reduced biases on mean, variance, first and second quantile However, biases on third and fourth moment could not be handled robustly while biases on third quantile only reduced during dry months.
Volume: 16
Issue: 1
Page: 241-249
Publish at: 2018-02-01

Exponential Tapered Balun with Different Sizes for UWB Elliptical Dipole Antenna

10.12928/telkomnika.v16i1.8360
M A; Universiti Tun Hussein Onn Malaysia Zakwan , S A; Universiti Tun Hussein Onn Malaysia Hamzah , S M; Universiti Tun Hussein Onn Malaysia Shah , K N; Universiti Tun Hussein Onn Malaysia Ramli , M S; Universiti Tun Hussein Onn Malaysia Zainal , L; Universiti Tun Hussein Onn Malaysia Audah , N; Universiti Tun Hussein Onn Malaysia Abdullah , A; Universiti Tun Hussein Onn Malaysia Ubin , F C; Universiti Tun Hussein Onn Malaysia Seman , A K; Universiti Tun Hussein Onn Malaysia Anuar , Adeeb; Universiti Tun Hussein Onn Malaysia Salh , M; Universiti Teknologi Malaysia Esa , N N N; Universiti Teknologi Malaysia Abd Malik
This work presents a broadband tapered balun with different sizes using nonlinear transition particularly suitable for planar and three-dimensional (3-D) dipole antennas for ultra-wideband (UWB) applications such as communication, radar systems and geolocation precision. Four baluns with wideband microstrip-to-parallel-strip transition using an elliptical structure for an elliptical dipole antenna are proposed. The initial balun structure consists of a nonlinear profile with a quarter-wavelength for both height and width. By studying the current distributions at the balun surface, it can be reduced to 25%, 50% and 75% from the original size. Measured results based on the reflection coefficients for all baluns are shown to be better than -10 dB from 1.0 GHz to 10 GHz. These baluns are integrated with an elliptical dipole which acts as a feeding circuit. Eight set of antennas with a planar and 3-D configurations with four different sizes are proposed in this work. The planar configurations are named as Planar 1, Planar 2, Planar 3 and Planar 4 while the 3-D configurations are named as 3D Dipole 1, 3D Dipole 2, 3D Dipole 3 and 3D Dipole 4, respectively. The results show that all antennas with the proposed baluns operates within the UWB frequency range.
Volume: 16
Issue: 1
Page: 217-223
Publish at: 2018-02-01

Investigation of Knee Flexion Angle Influences on Intra-Body Communication’s (IBC) Signal Attenuation

10.11591/ijeecs.v9.i2.pp424-430
I W Ibrahim , M M M Aruwa , A.H.A. Razak , A. Ahmad , R. N. Khir
Galvanic coupling method is one of the methods introduced in intra-body communication (IBC). IBC uses human body to as the communication medium for data transmission. In this paper, the investigation focuses on signal attenuation performance across knee joint using the galvanic coupling analysis. The signal attenuation was determined by implementing the galvanic coupling analysis at specific knee flexion angle. The galvanic analysis initiated by deciding the operating frequency in between 40 to 60 MHz in order to analyze the signal attenuation between the knee flexion angles. This paper found that the lowest signal attenuation at the operating frequency was 47.25dB, while the highest one was 52.63dB where the knee flexion angle is 0o and 155o respectively. It was concluded that the signal attenuation decrease with the increasing of knee joint existence at the specific flexion angle. However, a wider experiment must be conducted for various data that will correspond to signal attenuation for various influenced human data characteristics.
Volume: 9
Issue: 2
Page: 424-430
Publish at: 2018-02-01

Enhanced User-driven Ranking System with Splay Tree

10.12928/telkomnika.v16i1.5875
R.; Sathyabama University Jayashree , A.; Sathyabama University Christy
E-learning is one of the information and communication technology products used for teaching and learning process [35]. An efficient and effective way to construct trust relationship among peer users in e-learning environment is ranking. User-driven ranking systems are based only on the feedback or rating provided by the users. In [46-48] the authors provide a variety of trust and reputation methods. Certified Belief in Strength (CBS) [45] is a novel trust measurement method based on reputation and strength. In [38] author presents a recommendation system based on the relevant feedback review to predict the user's interests, that are ranked based on the recommendations history they provide previously. Users with higher rating obtain high reputation compared to less scored users. In question answering websites like StackOverflow, new or low scored users are ignored by the community. This discourage them and their involvement with the community reduces further down, as power law states, alleged low users are pushed to the bottom of the ranking list. Avoid this condition by encouraging less reputed users and prevent them from moving further down in ranking level. Thus, low reputed users are provided with few more chances to participate actively in the e-learning environments. A splay tree is a Binary Search Tree with self-balancing skill. The splay tree brings the recently accessed item to the top of the tree, thus active users are always on the top of the tree. A splay tree is used to represent user's ranks, and to semi-splay low ranked users again in the tree thus preventing them from further drowning in the ranking list. The focus of this research work is to find and enhance low reputed users in reputation system by providing few more chances to take part actively in the e-learning environment using the splay tree. Normalized discounted cumulative gain (NDCG) acts as a decision part for identifying drowning users.
Volume: 16
Issue: 1
Page: 432-444
Publish at: 2018-02-01

A New Compact and Wide-band Band-stop Filter Using Rectangular SRR

10.12928/telkomnika.v16i1.7578
B.; Hassan 1st University Nasiri , A.; Hassan 1st University Errkik , J.; Microwave Group ESEO Angers Zbitou , A.; Hassan 1st University Tajmouati , L. El; Hassan 1st University Abdellaoui , M.; Hassan 1st University Latrach
This paper proposes a novel compact band-stop filter based on Rectangular SRR unit cell. The BSF structure consists of modified microstrip line connected to 50 Ω feed line on both sides and Rectangular-SRR which has been added and located in the center of the proposed design. The R-SRR dimensions are chosen and optimized in order to achieve a resonant frequency in the undesired band. This filter is designed, simulated and optimized using two electromagnetic solvers. The circuit performances have been investigated and found to have an excellent BSF characterized by high power rejection level in the stop-band, low insertion loss in the both pass-bands and compact size. The experimental results illustrate that the proposed BSF achieves a wide fractional bandwidth of 72 % at 2.2GHz.
Volume: 16
Issue: 1
Page: 110-117
Publish at: 2018-02-01
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