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31,291 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

Hybrid Genetic Algorithms and Simulated Annealing for Multi-trip Vehicle Routing Problem with Time Windows

10.11591/ijece.v8i6.pp4713-4723
Amalia Kartika Ariyani , Wayan Firdaus Mahmudy , Yusuf Priyo Anggodo
Vehicle routing problem with time windows (VRPTW) is one of NP-hard problem. Multi-trip is approach to solve the VRPTW that looking trip scheduling for gets best result. Even though there are various algorithms for the problem, there is opportunity to improve the existing algorithms in order gaining a better result. In this research, genetic algoritm is hybridized with simulated annealing algoritm to solve the problem. Genetic algoritm is employed to explore global search area and simulated annealing is employed to exploit local search area. Four combination types of genetic algorithm and simulated annealing (GA-SA) are tested to get the best solution. The computational experiment shows that GA-SA1 and GA-SA4 can produced the most optimal fitness average values with each value was 1.0888 and 1.0887. However GA-SA4 can found the best fitness chromosome faster than GA-SA1.
Volume: 8
Issue: 6
Page: 4713-4723
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

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

Optimization Based Liver Contour Extraction of Abdominal CT Images

10.11591/ijece.v8i6.pp5061-5070
Jayanthi Muthuswamy , B Kanmani
This paper introduces computer aided analysis system for diagnosis of liver abnormality in abdominal CT images. Segmenting the liver and visualizing the region of interest is a most challenging task in the field of cancer imaging, due to small observable changes between healthy and unhealthy liver. In this paper, hybrid approach for automatic extraction of liver contour is proposed. To obtain optimal threshold, the proposed work integrates segmentation method with optimization technique in order to provide better accuracy. This method uses bilateral filter for preprocessing and Fuzzy C means clustering (FCM) for segmentation. Mean Grey Wolf Optimization technique (mGWO) has been used to get the optimal threshold. This threshold is used for segmenting the region of interest. From the segmented output, largest connected region are identified using Label Connected Component (LCC) algorithm. The effectiveness of proposed method is quantitatively evaluated by comparing with ground truth obtained from radiologists. The performance criteria like dice coefficient, true positive error and misclassification rate are taken for evaluation.
Volume: 8
Issue: 6
Page: 5061-5070
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

Provisioning of Street Lighting based on Ambience Intensity for Smart City

10.11591/ijeecs.v12.i3.pp1401-1406
Rajina R Mohamed , Mohamad A Mohamed , Arniyati Ahmad , Muhamad A H Abd Halim
Street lighting is a component that require an efficient energy management system for comprehensive energy savings. It should provide ultimate comfort and safety to road users that contribute to the stability of economy and social of the country as well to the smart city development. Currently many street lighting especially in Malaysia, which is ON in the evening and OFF before the sun sets without taking into consideration the ambient brightness and also the number of vehicles. This condition may increase the use of energy as well as dangerous to motorist. Thus this Ambient Street Lighting project was developed using embedded-based Arduino microcontroller for lighting management based on the circumstances surrounding of the road. A threshold value is set based on a reading of the actual situation in order to test the functionality of the prototype. The Ambient Street Lighting prototype have reacted with success towards surrounding brightness/darkness and number of cars passing by on the street.
Volume: 12
Issue: 3
Page: 1401-1406
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

A Critical Review of Time-frequency Distribution Analysis for Detection and Classification of Harmonic Signal in Power Distribution System

10.11591/ijece.v8i6.pp4603-4618
M. H. Jopri , A. R. Abdullah , T. Sutikno , M. Manap , M. R. Ab Ghani , M. R. Yusoff
This paper presents a critical review of time-frequency distributions (TFDs) analysis for detection and classification of harmonic signal. 100 unique harmonic signals comprise of numerous characteristic are detected and classified by using spectrogram, Gabor transform and S-transform. The rulebased classifier and the threshold settings of the analysis are according to the IEEE Standard 1159 2009. The best TFD for harmonic signals detection and classification is selected through performance analysis with regards to the accuracy, computational complexity and memory size that been used during the analysis.
Volume: 8
Issue: 6
Page: 4603-4618
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
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