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23,675 Article Results

Comparative Study of Bankruptcy Prediction Models

10.12928/telkomnika.v11i3.1143
Isye; Institut Teknologi Sepuluh Nopember Arieshanti , Yudhi; Institut Teknologi Sepuluh Nopember Purwananto , Ariestia; Institut Teknologi Sepuluh Nopember Ramadhani , Mohamat Ulin; Institut Teknologi Sepuluh Nopember Nuha , Nurissaidah; Institut Teknologi Sepuluh Nopember Ulinnuha
 Early indication of Bankruptcy is important for a company. If companies aware of potency of their Bankruptcy, they can take a preventive action to anticipate the Bankruptcy. In order to detect the potency of a Bankruptcy, a company can utilize a model of Bankruptcy prediction. The prediction model can be built using a machine learning methods. However, the choice of machine learning methods should be performed carefully because the suitability of a model depends on the problem specifically. Therefore, in this paper we perform a comparative study of several machine leaning methods for Bankruptcy prediction. It is expected that the comparison result will provide insight about the robust method for further research. According to the comparative study, the performance of several models that based on machine learning methods (k-NN, fuzzy k-NN, SVM, Bagging Nearest Neighbour SVM, Multilayer Perceptron(MLP), Hybrid of MLP + Multiple Linear Regression), it can be concluded that fuzzy k-NN method achieve the best performance with accuracy 77.5%. The result suggests that the enhanced development of bankruptcy prediction model could use the improvement or modification of fuzzy k-NN.
Volume: 11
Issue: 3
Page: 591-596
Publish at: 2013-09-01

Numerical Calculation of Transient Thermal Characteristics in Gas-Insulated Transmission Lines

10.12928/telkomnika.v11i3.945
Li Hongtao; Wuhan University Li Hongtao , Shu; Wuhan University Naiqiu , Li Ling; Wuhan University Li Ling , Wu Xiaowen; Wuhan University Wu Xiaowen
For further knowledge of the thermal characteristics in gas-insulated transmission lines (GILs) installed above ground, a finite-element model of coupling fluid field and thermal field is established, in which the corresponding assumptions and boundary conditions are given.  Transient temperature rise processes of the GIL under the conditions of variable ambient temperature, wind velocity and solar radiation are respectively investigated. Equivalent of surface convective heat transfer coefficient and heat flux boundary conditions are updated in the analysis process. Unlike the traditional finite element method (FEM), the variability of the thermal properties with temperature is considered. The calculation results are validated by the tests results reported in the literature. The conclusion provides method and theory basis for the knowledge of transient temperature rise characteristics of GILs in open environment.
Volume: 11
Issue: 3
Page: 425-432
Publish at: 2013-09-01

The Construction and Performance of a Novel Intergroup Complementary Code

10.12928/telkomnika.v11i3.1137
Wenzhun; Xijing University Huang , Shanwen; Xijing University Zhang
 On the basis of the analyses for intergroup complementary (IGC) code and zero correlation zone complementary code, a novel IGC code has been proposed to adapt M-ary orthogonal code spreading spectrum system or quasi-synchronous CDMA system. The definition and construction methods of the new IGC codes are presented and an applied example is given in this paper. Theoretical research and simulation results show that the main advantages of the novel IGC code are as following: The code sets of the novel IGC code is more than IGC code under the same code length. The zero correlation zone length is longer than the intergroup IGC code, but shorter than the intergroup IGC code. Under the same code length, the auto-correlation performance of the novel IGC code is better than that of the IGC code, and both are of similar cross-correlation performance.
Volume: 11
Issue: 3
Page: 547-554
Publish at: 2013-09-01

Small Price Index of College Students Based on EEG

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2659
ShuLi Huang , ZhenDong Mu , HuaLiang Wu , HuaBo Xiao
Study of consumer psychology and consumer price index usually used questionnaire method; this method is very good at solving the macro problem, however, to specific numerical value index, used questionnaire method is difficult to determine, and there is always a certain doubt about the correctness of the results what used questionnaire method. Because of EEG can be true reflection of the true psychological characteristics of the subjects, the paper selects EEG analysis tool as the consumer price index. Subjects tested with the different combination of the different quantity of money, processed and analysis this three sets of subjects EEG data, by analyzing the time and amplitude of the N170 and P300 to study college students in the daily life of the small consumer index. DOI: http://dx.doi.org/10.11591/telkomnika.v11i9.3299
Volume: 11
Issue: 9
Page: 5415-5419
Publish at: 2013-09-01

Statistical MOSFET Parameter Extraction with Parameter Selection for Minimal Point Measurement

10.12928/telkomnika.v11i3.984
Marga; Institut Teknologi Indonesia Alisjahbana
A method to statistically extract MOSFET model parameters from a minimal number of transistor I(V) characteristic curve measurements, taken during fabrication process monitoring. It includes a sensitivity analysis of the model, test/measurement point selection, and a parameter extraction experiment on the process data. The actual extraction is based on a linear error model, the sensitivity of the MOSFET model with respect to the parameters, and Newton-Raphson iterations. Simulated results showed good accuracy of parameter extraction and I(V) curve fit for parameter deviations of up 20% from nominal values, including for a process shift of 10% from nominal.
Volume: 11
Issue: 3
Page: 503-512
Publish at: 2013-09-01

Interest Excitation Propagation Model for Information Propagation on micro-blogging

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2588
Hongtao Liu , Hongfeng Yun , Hui Chen , Zhaoyu Li , Yu Wu
An Information propagation model of micro-blogging is proposed for distinguishing normal and non-normal micro-blogging based on users’ interest excitation, which is abbreviated as IEPM(Interest Excitation Propagation Model for Information).The parameters of the model are clearly associated with the actual propagation and can reflect the characteristics of the propagation feature. The model can distinguish users’ non-autonomous behavior in the propagation process of micro-blogging, which can preliminarily judge that it is a non-normal marketing micro-blogging when it doesn’t meet the general propagation in the model. Quantitative analysis and experiment is performed with the dataset from the representative and typical non-normal micro-blogging in Sina micro-blogging, one of the most popular micro-blogging in China. The results show that the model can better reveal the general propagation laws of micro-blogging, and can distinguish normal and non-normal micro-blogging, which will have theoretical and practical significance to a certain degree. DOI: http://dx.doi.org/10.11591/telkomnika.v11i9.2734
Volume: 11
Issue: 9
Page: 4885-4895
Publish at: 2013-09-01

Utilization of Near Field Communication Technology for Loyalty Management

10.12928/telkomnika.v11i3.1147
Ferina; GunadarmaUniversity Ferdianti , Yusuf; GunadarmaUniversity Triyuswoyo , Dewi; GunadarmaUniversity Agushinta R.
Near Field Communication (NFC) is one of wireless technology developed at this time. We can use a mobile phone to do many transactions with NFC. Mobile developments have created to provide convenience for users in all aspects. However, at this time the function of NFC just limited for payment and micropayment. Beside it, there are assets that support to increase sales with attention of loyality management system. In this system, discounts or prizes are given based on data mining for every transaction customers. This loyalty management has three concepts. Those are Frequency, Recency and Quantity (FRQ). The goals are minimizing the cost, making purchase process faster, and managing data obtained through the NFC technology more simple. The result of this paper is the procedure to use data mining of NFC for loyalty management and designing system using Unified Modeling Language approach.
Volume: 11
Issue: 3
Page: 617-624
Publish at: 2013-09-01

Substation Fault Diagnosis Based on Time Sequence Fuzzy Petri Net

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2585
Haiying Dong , Xiaonan Li
As the 750kV substation has the characteristics like timing inconsistency, dual protection configuration and uncertain diagnosis result, a fault diagnosis method of substation with redundant protection configuration based on time sequence fuzzy Petri nets is proposed. In this method, redundant knowledge about fault component is represented by using two sets of protective information. On that basis, component redundant diagnosis-model based on time sequence fuzzy Petri net is constructed, which can be decomposed into main and redundant subnet-model, in which initial-information credibility is determined by using information-entropy, the time sequence constraint is checked and initial-information credibility is corrected by using the relationship between acted protection and breaker. Compared with fuzzy Petri net diagnosis method taking no account of time sequence factor, the proposed method can not only identify the malfunction information, but also obtain a certain result. DOI: http://dx.doi.org/10.11591/telkomnika.v11i9.2528
Volume: 11
Issue: 9
Page: 4861-4870
Publish at: 2013-09-01

Research and Design in Unified Coding Architecture for Smart Grids

10.12928/telkomnika.v11i3.951
Gang; China University of Mining and Technology Han , Jianwen; China University of Mining and Technology Zhang , Xin; China University of Mining and Technology Chu
 Standardized and sharing information platform is the foundation of the Smart Grids. In order to improve the dispatching center information integration of the power grids and achieve efficient data exchange, sharing and interoperability, a unified coding architecture is proposed. The architecture includes coding management layer, coding generation layer, information models layer and application system layer. Hierarchical design makes the whole coding architecture to adapt to different application environments, different interfaces, loosely coupled requirements, which can realize the integration model management function of the power grids. The life cycle and evaluation method of survival of unified coding architecture is proposed. It can ensure the stability and availability of the coding architecture. Finally, the development direction of coding technology of the Smart Grids in future is prospected.
Volume: 11
Issue: 3
Page: 463-472
Publish at: 2013-09-01

Statistical MOSFET Parameter Extraction with Parameter Selection for Minimal Point Measurement

10.12928/telkomnika.v11i3.1129
Marga; Institut Teknologi Indonesia Alisjahbana
A method to statistically extract MOSFET model parameters from a minimal number of transistor I(V) characteristic curve measurements, taken during fabrication process monitoring. It includes a sensitivity analysis of the model, test/measurement point selection, and a parameter extraction experiment on the process data. The actual extraction is based on a linear error model, the sensitivity of the MOSFET model with respect to the parameters, and Newton-Raphson iterations. Simulated results showed good accuracy of parameter extraction and I(V) curve fit for parameter deviations of up 20% from nominal values, including for a process shift of 10% from nominal.
Volume: 11
Issue: 3
Page: 503-512
Publish at: 2013-09-01

A Method of Multi-channel Data Acquisition with Adjustable Sampling Rate

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2643
Su Shujing , Lei Jiansheng
Sampling rate of current signal acquisition systems are singular. Aiming at this shortcoming, a method of multi-channel data acquisition(DAQ) with adjustable sampling rate is presented. The method realizes the cut-off frequency of anti-aliasing filter controlled by program with the help of switched-capacitor; by independently pulsing sampling signal of different ADCs, 16-channel sampling rate are adjustable within the range 50ksps, 25ksps, 10ksps, 5ksps, 1ksps. Theoretical analysis and experimental verification pointing at the proposed method are implemented: theoretical analysis shows that parameters of the filter meet the design requirements; experimental results show that cut-off frequency of the anti-aliasing filter matches variable sampling rate very well; choosing appropriate sampling rate according to the characteristics of the measured signal not only can well restore the measured signal, but also prevents system resources from waste. This method can meet needs of testing various signals with different frequency at the same time. DOI: http://dx.doi.org/10.11591/telkomnika.v11i9.3283 
Volume: 11
Issue: 9
Page: 5299-5307
Publish at: 2013-09-01

Isolated Sign Language Characters Recognition

10.12928/telkomnika.v11i3.1142
Paulus Insap; UGM Santosa
 People with normal senses use spoken language to communicate with others. This method cannot be used by those with hearing and speech impaired. These two groups of people will have difficulty when they try to communicate to each other using their own language. Sign language is not easy to learn, as there are various sign languages, and not many tutors are available. This study focuses on the character recognition based on manual alphabet. In general, the characters are divided into letters and numbers. Letters were divided into several groups according to their gestures. Characters recognition was done by comparing the photograph of a character with a gesture dictionary that has been previously developed. The gesture dictionary was created using the normalized Euclidian distance. Character recognition was performed by using the nearest neighbor method and sum of absolute error. Overall, the level of accuracy of the proposed method was 96.36%.
Volume: 11
Issue: 3
Page: 583-590
Publish at: 2013-09-01

A Hardware Time Stamping Method for PTP Messages Based on Linux system

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2617
Zhi Li , Zhen-lin Zhong , Wang-chun Zhu , Bin-yi Qin
In order to achieve high-precision clock synchronization among instrument nodes in distributed LXI bus test systems. A Hardware time stamping method for PTP messages is introduced in this paper. It is implemented in Linux systems, which runs on ARM9 S3C2440 processor. The special PHYTER DP83640 is used to mark the time of PTP messages in physical layer. The new socket option SO_TIMESTAMPING is used to obtain the hardware timestamps in user space programming. A clock synchronization test has been done after transplanting the open source protocol software PTPd on this platform. The results indicate that this method is feasible. It is able to achieve nanosecond level clock synchronization accuracy. DOI: http://dx.doi.org/10.11591/telkomnika.v11i9.3255
Volume: 11
Issue: 9
Page: 5105-5111
Publish at: 2013-09-01

Relationships between Excitation Voltage and Performance of AFWR Synchronous Generator

10.12928/telkomnika.v11i3.983
Abdul; Universitas Indonesia Multi , Iwa; Universitas Indonesia Garniwa
            The axial flux wound rotor generator has field winding that should be connected to a dc voltage source. Varying the excitation voltage, its electric performance might  be controlled to meet the need of a load voltage attached to its terminal. The generator designed is small-scale capacity which has 1 kW, 380 V and 750 rpm. The generator has a single double-sided slotted wound stator sandwiched between twin rotor. The effect of excitation voltage changes on its performance can be seen from the result of calculations using the given equations.The calculation results reveal electric quantities suited with respect to performance of the machine. If the voltage is higher then the losses will be lower. However, the higher the voltage, the higher the efficiency and the torque.It has been found out that for the excitation voltage11 V, the efficiency and the torque are 85.12 % and 13.04 Nm respectively.
Volume: 11
Issue: 3
Page: 425-432
Publish at: 2013-09-01

The Application of BP Neural Network In Oil-Field

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2640
Pei-Ying ZHANG , Meng-Meng ZHAO
Aiming at the situation that many techniques of production performance analysis acquire lots of data and are expensive considering the computational and human resources, and their applications are limited, this paper puts forward a new method to analyze the production performance of oil-field based on the BP neural network. It builds a dataset with some available measured data such as well logs and production history, then, builds a field-wide production model by neural network technique, a model will be used to predict. The technique is verified, which shows that the predicted results are consistent with the maximum error of rate of oil production lower than 7% and maximum error of rate of water production lower than 5%, having certain application and research value. DOI: http://dx.doi.org/10.11591/telkomnika.v11i9.3280
Volume: 11
Issue: 9
Page: 5277-5283
Publish at: 2013-09-01
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