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30,907 Article Results

Anomaly Detection based on Control-flow Pattern of Parallel Business Processes

10.12928/telkomnika.v16i6.10568
Hendra; Institut Teknologi Sepuluh Nopember Darmawan , Riyanarto; Institut Teknologi Sepuluh Nopember Sarno , Adhatus Solichah; Institut Teknologi Sepuluh Nopember Ahmadiyah , Kelly Rossa; Institut Teknologi Sepuluh Nopember Sungkono , Cahyaningtyas Sekar; Institut Teknologi Sepuluh Nopember Wahyuni
The purpose of this paper was to discover an anomalous-free business process model from event logs. The process discovery was conducted using a graph database, specifically using Neo4J tool involving trace clustering and data filtering processes. We also developed a control-flow pattern to address, AND relation between activities named parallel business process. The result showed that the proposed method improved the precision value of the generated business process model from 0.64 to 0.81 compared to the existing algorithm. The better outcome is constructed by applying trace clustering and data filtering to remove the anomaly on the event log as well as discovering parallel (AND) relation between activities.
Volume: 16
Issue: 6
Page: 2809-2816
Publish at: 2018-12-01

Multiuser Detection with Decision-Feedback Detectors and PIC in MC-CDMA System

10.12928/telkomnika.v16i6.9448
Leila; Badji Mokhtar University Sahraoui , Djemil; Badji Mokhtar University Messadeg , Saliha e; Badji Mokhtar University Hariz , Noureddine; Badji Mokhtar University Doghmane
In this paper we propose an iterative parallel decision feedback (P-DF) receivers associated with parallel interference cancellation (PIC) for multicarrier code division multiple access (MC-CDMA) systems in a Rayleigh fading channel (cost 207). First the most widely detection techniques, minimum mean-squared error MMSE, Maximum Likelihood ML and PIC were investigated in order to compare their performances in terms of Bit Error Rate (BER) with parallel feedback detection P-DFD. A MMSE DF detector that employs parallel decision-feedback (MMSE-P-DFD) is considered and shows almost the same BER performance with MMSE and ML, which present a better result than the other techniques. In a second time, an iterative proposed method based on the multi-stage techniques P-DFD (parallel DFD with two stages) and PIC was exploited to improve the performance of the system.
Volume: 16
Issue: 6
Page: 2578-2587
Publish at: 2018-12-01

Loss Quantization of Reflectarray Antenna Based on Organic Substrate Materials

10.12928/telkomnika.v16i6.9968
H. I; University Tun Hussein Onn Malaysia Malik , M. Y; Universiti Tun Hussein Onn Malaysia Ismail , Sharmiza; Forest Research Institute Malaysia Adnan , S. R; Forest Research Institute Malaysia Masrol
This paper presents novel loss quantization of reflectarray elements based on organic substrate materials. Three differently composed substrate materials derived from recycled materials have been characterized for their dielectric properties using a broadband analysis technique. The materials show low dielectric permittivity values of 1.81, 1.62 and 1.84 for X-band frequency range. In order to estimate the reflection loss of for the three substrates a mathematical relation has been established using empirical data generated by computer simulated models. The reliability of the proposed model has been established by simulation and fabrication of unit reflectarray rectangular patch elements on three proposed substrate substrates. A broadband frequency response has been depicted by scattering parameter analysis of unit elements with 10% fractional bandwidth of 312, 340 and 207 MHz for RCP50, RCR75 and RNP50 substrate respectively.
Volume: 16
Issue: 6
Page: 2570-2577
Publish at: 2018-12-01

Integration of Linux Containers in OpenStack: An Introspection

10.11591/ijeecs.v12.i3.pp1094-1105
Ashish Lingayat , Ranjana R. Badre , Anil Kumar Gupta
In cloud computing, sharing of resources is supported using heavy weighted traditional virtualization techniques. Such techniques involve hypervisors to emulate hardware for creating virtual machines. The inclusion of an additional layer of hypervisor over host operating system depreciates the performance of the virtual machine. Recent evolution is a lightweight alternative to the virtual machine called containers which have gainedpopularity among developers and administrators. Container Based virtualization has proven very efficient regarding performance, and many industries are now migrating their virtualized environment to run on Linux containers. Containers use host operating systems kernel and isolate each container by encapsulating them with their required services and packages. Linux kernel is very beneficial in implementing containers, which is the reason for the existence of Linux containers. Linux containers utilize less storage space and consume optimal computational power, giving a hike in performance. Having them integrated into the cloud surely benefits consumer and cloud provider. Many projects have extended their support in incorporating containers in the cloud. In this paper, we will discuss various Linux containers and their management tools along with cloud computing software, OpenStack, including projects undertaken by OpenStack for integrating containers in the cloud.
Volume: 12
Issue: 3
Page: 1094-1105
Publish at: 2018-12-01

RS Codes for Downlink LTE System over LTE-MIMO Channel

10.12928/telkomnika.v16i6.9177
Ghasan Ali; Universiti Tun Hussein Onn Malaysia Hussain , Lukman; Universiti Tun Hussein Onn Malaysia Audah
Nowdays, different applications require a modern generation of mobile communication systems; long term evolution (LTE) is a candidate to achieve this purpose. One important challenge in wireless communications, including LTE systems, is the suitable techniques of controlling errors that degrade system performance in transmission systems over multipath fading channels. Different forward Error correction (FEC) techniqes are required to improve the robustness of transmission channels. In this paper, Reed-Solomon (RS) codes were used with a downlink LTE system over a LTE-MIMO channel. This research contributes by combining RS codes that have low decoding complexity (by using hard decision decoding) with a LTE-MIMO channel to improve downlink LTE system performance. The results show that using RS codes clearly improves LTE system performance and thus decreases Bit Error Rates (BER) more than convolutional and turbo codes which have high decoding complexity. Lastly, the results show also extra improvements of downlink LTE system performance by increasing the number of antennas of the LTE-MIMO channel.
Volume: 16
Issue: 6
Page: 2563-2569
Publish at: 2018-12-01

Development of Algorithm for Preservation of Heritage Murals and Painting Using Image Processing

10.11591/ijict.v7i3.pp146-148
S. Lalithakumari , Pandian R
Image archiving and preservation finds extensive application in culture heritage murals. The study of cultural heritage is of the extreme importance at national and international levels. Not only global organizations like UNESCO but also museums, libraries, culture, temples and private initiatives are working in these directions. During the last three decades, researchers in the field of imaging discipline have started to contribute an increasing set of algorithms for cultural heritage; in that way providing indispensable support to these efforts. A better comparison of the different compression methods presented in this proposed work for culture Heritage mural images. Compression methods usually applied some method to reduce the number of components within each spectrum. The effectiveness of mural image archiving and preservation is analyzed based on 2-D wavelets filtering. The optimum algorithm is also found based on the results.
Volume: 7
Issue: 3
Page: 146-148
Publish at: 2018-12-01

Inclined Image Recognition for Aerial Mapping using Deep Learning and Tree based Models

10.12928/telkomnika.v16i6.10157
Muhammad; Institut Teknologi Sepuluh Nopember Attamimi , Ronny; Institut Teknologi Sepuluh Nopember Mardiyanto , Astria Nur; Institut Teknologi Sepuluh Nopember Irfansyah
One of the important capabilities of an unmanned aerial vehicle (UAV) is aerial mapping. Aerial mapping is an image registration problem, i.e., the problem of transforming different sets of images into one coordinate system. In image registration, the quality of the output is strongly influenced by the quality of input (i.e., images captured by the UAV). Therefore, selecting the quality of input images becomes important and one of the challenging task in aerial mapping because the ground truth in the mapping process is not given before the UAV flies. Typically, UAV takes images in sequence irrespective of its flight orientation and roll angle. These may result in the acquisition of bad quality images, possibly compromising the quality of mapping results, and increasing the computational cost of a registration process. To address these issues, we need a recognition system that is able to recognize images that are not suitable for the registration process. In this paper, we define these unsuitable images as “inclined images,” i.e., images captured by UAV that are not perpendicular to the ground. Although we can calculate the inclination angle using a gyroscope attached to the UAV, our interest here is to recognize these inclined images without the use of additional sensors in order to mimic how humans perform this task visually. To realize that, we utilize a deep learning method with the combination of tree-based models to build an inclined image recognition system. We have validated the proposed system with the images captured by the UAV. We collected 192 images and labelled them with two different levels of classes (i.e., coarse- and fine-classification). We compared this with several models and the results showed that our proposed system yielded an improvement of accuracy rate up to 3%.
Volume: 16
Issue: 6
Page: 3034-3044
Publish at: 2018-12-01

Comparison of Multiscale Entropy for Lung Sound Classification

10.11591/ijeecs.v12.i3.pp984-994
Achmad Rizal , Risanuri Hidayat , Hanung Adi Nugroho
Lung sound is a biological signal that can be used to determine the health level of the respiratory tract. Various digital signal processing techniques have been developed for automatic classification of lung sounds. Entropy is one of the parameters used to measure the biomedical signal complexity. Multiscale entropy is introduced to measure the entropy of a signal at a particular scale range. Over time, various multiscale entropy techniques have been proposed to measure the complexity of biological signals and other physical signals. In this paper, some multiscale entropy techniques for lung sound classification are compared. The result of the comparison indicates that the Multiscale Permutation Entropy (MPE) produces the highest accuracy of 97.98% for five lung sound datasets. The result was achieved for the scale 1-10 producing ten features for each lung sound data. This result is better than other seven entropies. Multiscale entropy analysis can improve the accuracy of lung sound classification without requiring any features other than entropy.
Volume: 12
Issue: 3
Page: 984-994
Publish at: 2018-12-01

Fuzzy Rule-based Classification Systems for the Gender Prediction from Handwriting

10.12928/telkomnika.v16i6.9478
Lala Septem; Universitas Pendidikan Indonesia Riza , Aldi; Universitas Pendidikan Indonesia Zainafif , Rasim; Universitas Pendidikan Indonesia Rasim , Shah; University of Swabi Nazir
The handwriting is an object that can describe information about the author implicitly. For example, it is able to predict the gender. Recently, the gender prediction based on handwriting becomes an interesting research. Even in 2013, an competition for prediction gender from handwriting has been held by Kaggle. However, the accuracies of current approaches are relatively low. So, in this study, we attempt to implement Fuzzy Rule-Based Classification Systems (FRBCSs) for gender predictions from handwriting. Three stages are conducted to achieve the objective, as follows: defining some features based on Graphology Techniques (e.g., pressure, height, and margin on writing), collecting real datasets, processing on digital images (i.e., image segmentation, projection profiles, and margin calculation, etc.), and implementing FRBCSs. The implemented algorithm based on FRBCSs in this research is Chi’s Algorithm, which is a method based on Fuzzy Logic for classification tasks. Moreover, some experiments and analysis, involving 75 respondents consisting of 36 males and 39 females, have been done to validate the proposed model. From the simulations, the classification rate obtained is 76%. Besides improving the accuracy rate, the proposed model can provide an understandable model by utilizing fuzzy rule-based systems.
Volume: 16
Issue: 6
Page: 2725-2732
Publish at: 2018-12-01

A Small RLSA Antenna Utilizing the Specification of Back Fires 17 dBi LAN Antennas

10.12928/telkomnika.v16i6.10414
Teddy; Universitas Islam Negeri Sultan Syarif Kasim Purnamirza , Prayoga; Universitas Islam Negeri Sultan Syarif Kasim Budikesuma , Imran M. Bin; Universiti Teknikal Malaysia Malaka Ibrahim , Depriwana; Universitas Islam Negeri Sultan Syarif Kasim Rahmi , Rika; Universitas Islam Negeri Sultan Syarif Kasim Susanti
This research developed a small RLSA antenna that mimics the specification of a Wi-Fi antenna that is available in markets, which is a Back Fires 17 dBi LAN antenna. This research used the size of the back fires antenna as the size for the RLSA antenna. Base on this size, we designed and simulated 71 RLSA antenna models. Among them, we chose a best model and fabricated its prototype. We measured the prototype and found that the measurement result fits the simulation result, thus verifying the correctness of the antenna model. Furthermore, we analysed that with the same size, our RLSA antenna has better performance compared to the back fires antenna, in term of gain (0,53 dB higher), and in term of bandwidth (1075 MHz wider). We also found that our RLSA antenna is lighter and thinner compared to the back fires antenna. We also test the RLSA antenna in real condition for indoor and outdoor communication link. The test showed that the RLSA antenna can performs properly.
Volume: 16
Issue: 6
Page: 2871-2878
Publish at: 2018-12-01

PID Control Design for Biofuel Furnace using Arduino

10.12928/telkomnika.v16i6.9770
Agus; Adhi Tama Institute of Technology Budianto , Wahyu S.; Adhi Tama Institute of Technology Pambudi , Sumari; State University of Malang Sumari , Andik; Batam International University Yulianto
The target of the Indonesian government in 2025 is increasing the use of renewable energy up to 23%, one part of potential renewable energy in Indonesia is biofuel. Biofuel requires raw materials of plant or animal oil with or without catalyst, it does not require the raw material of ethanol or methanol. The product is similar to gasoline and diesel that came from crude oil. Potential oil-producing plants in Indonesia are Palm Oil and Nyamplung (Calophyllum inophyllum L.). The process of making biofuel from this material is done by heating the reactor or furnace with temperature range of 350° C - 500° C. To reach the stability of furnace temperature, it requires temperature control systems and one of them is PID. Arduino microcontroller is an open source and user friendly platform for hardware and software. The control system that designed by using arduino is capable to control the furnace temperature from 200° C to 400° C and it is using a 6000 watt heater. The best system response is achieved when Kp = 15, Ki = 15 and Kd = 1. With these parameter values, the system has the lowest overshoot response of 16%, so it is safe for biofuel furnace, even though the rise time value is 146 s, settling time of 429 and steady state error is equal to 2.87%.
Volume: 16
Issue: 6
Page: 3016-3023
Publish at: 2018-12-01

Sub-1 GHz Wireless Nodes Performance Evaluation for Intelligent Greenhouse System

10.12928/telkomnika.v16i6.11556
I Nyoman Kusuma; Politeknik Negeri Bali Wardana , Ngakan Nyoman Kutha; Universitas Pendidikan Nasional Krisnawijaya , I Wayan Aditya; Universitas Pendidikan Ganesha Suranata
Greenhouses provide not only solution to problems faced by conventional farming systems but also play an important role to improve the energy efficiency and environmentally friendly awareness. To achieve benefits of greenhouse farming system in terms of energy efficiency, research related to this issue have been done by many researchers. However, resources that concern on how to practically implement the particular energy-saving technology for greenhouses need to be improved. In this research, field experiment results related to low-power communication between nodes have been reported by implementing universal prototype modules. The pros and cons of existing communication technology, the proposed architecture of network and module analysis, and the performance evaluation of the proposed module dedicated to intelligent greenhouse farming system were also discussed.
Volume: 16
Issue: 6
Page: 2888-2895
Publish at: 2018-12-01

Solar Panel Control System Using an Intelligent Control: T2FSMC and Firefly Algorithm

10.12928/telkomnika.v16i6.8694
Mardlijah; Institut Teknologi Sepuluh Nopember (ITS) Mardlijah , Zainullah; Institut Teknologi Sepuluh Nopember (ITS) Zuhri
Solar panel is a solar energy converter to electrical energy. On solar tracker, there is a controller which sets the movement of solar panel such that it is perpendicular with solar rays. Previous research had designed Type 2 Fuzzy Sliding Mode Control (T2FSMC) controller to control the position of solar panel. However, there was trial and error process to determine gain scale factor so the development of optimization method is needed. This paper aims to modify gain scale factor using Firefly algorithm to increase performance of system. The simulation shows that T2FSMC Firefly has better performance than T2FSMC. T2FSMC Firefly shows the increase of performance on rise time, settling time, and integral time absolute error.
Volume: 16
Issue: 6
Page: 2988-2998
Publish at: 2018-12-01

Dwindling of Real Power Loss by Enriched Big Bang-Big Crunch Algorithm

10.11591/ijai.v7.i4.pp190-196
K. Lenin
In this paper, Enriched Big Bang-Big Crunch (EBC) algorithm is proposed to solve the reactive power problem. The problem of converging to local optimum solutions occurred for the Bang-Big Crunch (BB-BC) approach due to greedily looking around the best ever found solutions. The proposed algorithm takes advantages of typical Big Bang-Big Crunch (BB-BC) algorithm and enhances it with the proper balance between exploration and exploitation factors. Proposed EBC algorithm has been tested in standard IEEE 118 & practical 191 bus test systems and simulation results show clearly the improved performance of the proposed algorithm in reducing the real power loss.
Volume: 7
Issue: 4
Page: 190-196
Publish at: 2018-12-01

Comparison of Raindrop Size Distribution Characteristics Across the Southeast Asia Region

10.12928/telkomnika.v16i6.10091
Manhal; Universiti Teknologi Malaysia Alhilali , Lam Hong; Universiti Tun Hussein Onn Malaysia Yin , Jafri; Universiti Teknologi Malaysia Din
Satellite communication requires reliable estimates of the channel characteristics, especially with the future use of higher frequencies. Regardless of the rain rate, the shape of rain drop size distribution (DSD) start to considerably effect the specific attenuation. In this study DSDs are studied using ground-based two-dimensional video disdrometer measurements taken from Johor, Malaysia as well as two similar datasets from Gan and Manus, two equatorial islands. Integral rain parameters are studied to explain DSD variations across the Southeast Asia region. Slightly higher raindrop concentrations and larger diameters were observed in Johor than in Gan or Manus, which is due to Johor being affected by not only oceanic rain- fall but land rainfall as well. The measured rainfall was classified into convective and stratiform precipitation types; the results showed that the Southeast Asia region is dominated by convective rain in terms of accumulated rainfall amount, but stratiform rain occurred more frequently. Further, seasonal variations observed in Johor were insignificant and the DSD variation was mostly due to changes in percentage occurrence of the precipitation types for each monsoon season.
Volume: 16
Issue: 6
Page: 2522-2527
Publish at: 2018-12-01
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