Showing papers in "The Journal of the Korea institute of electronic communication sciences in 2013"

Diagnosis of power supply by analysis of chaotic nonlinear dynamics

Abstract: In this paper, n order to degrade of diagnosis of power supply by using Poincare map and fractal dimension with temperature measured by infrared camera. we review the characteristic of temperature variation according to pattern variation of power supply in chemical industry complex. As a simulation results we can be realized the characteristic behaviors of nonlinear dynamics in the poincare mal and fractal dimension. In the future verification method requires through additional research.

Determinants of Internet Addiction among the Korea Youth

Abstract: The purpose of this study was to examine effects of socio-demographic, health, and delinquent behavior factors on internet addiction among the Korean youth. This study used the 2009 Korean Youth Health Risk Behavior On-line Survey data. It selected 73,238 cases of junior and senior high school students from the raw data and conducted a secondary data analysis. Frequency analysis, chi-square test and logistic regression analysis was conducted. Being male, living without parents, low economic status, poor academic record, poor subjective health status, poor subjective well-being, high level of stress, presence of depression and experience of drug use significantly increased likelihood of internet addiction. Findings may be used for developing strategies to deal with internet addiction among adolescents in Korea.

A Study for Video-based Vehicle Surveillance on Outdoor Road

Abstract: Detection performance of the vehicle on the road depends on weather conditions, the shadow by the movement of the sun, or illumination changes, etc. In this paper, a vehicle detection system in conjunction with a robust background estimate algorithm to environment change on the road in daytime is proposed. Gaussian Mixture Model is applied as background estimation algorithm, and also, Adaboost algorithm is applied to detect the vehicle for candidate region. Through the experiments with input videos obtained from a various weather conditions at the same actual road, the proposed algorithm were useful to detect vehicles in the road.

The relationship between stress and suicidal ideation among the Korean Multi-Cultural family Adolescents

Abstract: This study was investigated the relationship between the stress and suicidal ideation of adolescents from multi-cultural families. For the purpose, the study incorporated data of Youth Risk Behavior Web-based Survey 2011-2 and attempted to understand factors of their suicide ideation and reasons of stress, targeting 607 boy students and 543 girl students. For a statistical analysis, SPSS version 17.0 was used. During the analysis, the students one of which parents was not born in Korea were considered as those from multi-cultural families and statistical significance was set to be p

Study on Precise Positioning using Hybrid Track Circuit system in Metro

Abstract: We have studied on the possibility of precise positioning using hybrid Track Circuit system. Hybrid Track Circuit uses RFID which replaces UHF. Hybrid Track Circuit is a part of next generation railroad signal system which is available to communicate with a railway on board system based on a realtime operating system. If applicate on a current hand operating subway, phenomenon caused by driver`s mistake such as passing a stop without stopping or mismatch error between PSD and train door should be prevented.

Effect of Life Stress on the Sleeping Disorder of University Student

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A Distortion Correction Method of Wide-Angle Camera Images through the Estimation and Validation of a Camera Model

Abstract: In order to solve the problem of severely distorted images from a wide-angle camera, we propose a calibration method which corrects a radial distortion in wide-angle images by estimation and validation of camera model. First, we estimate a camera model consisting of intrinsic and extrinsic parameters from calibration patterns, where intrinsic parameters are the focal length, the principal point and so on, and extrinsic parameters are the relative position and orientation of calibration pattern from a camera. Next we validate the estimated camera model by re-extracting corner points by inversing the model to images. Finally we correct the distortion of the image using the validated camera model. We confirm that the proposed method can correct the distortion more than 80% by the calibration experiments using the lattice shaped pattern images captured from a general web camera and a wide-angle camera.

Association between Obesity and Physical Activity about Middle and High School Students in Korea

Abstract: Schools where adolescents spend most of their time should develop a variety of activity programs to encourage them to participate in more physical activities in physical education time, break time, lunch time, and after-school time. To support the direction, educational policy and students and parents` perception on physical education should be changed, and organized plans should be developed through cooperation with experts of communities.

Design of RFID Packaging for Construction Materials

Abstract: RFID (Radio Frequency Identification), which is a kind of the electronic tag, is a wireless access device using the radio frequency for recognizing the ID information. It has a variety of application such as the bus card, gate access card, distribution industry, and management of construction materials. The performance and size of RFID depend on the penetrability, recognition ratio, memory size, multi tag recognition, external pollution dust, and exterior impact, and RFID requires the packaging to protect itself considered above factors. Recently, RFID is diversely employed to effectively manage construction materials and the RFID packaging, which is robust to the external impact, is required to attach RFID on construction materials. In this paper, we propose the construction material RFID packaging designed to be robust for the external impact and to be practicable for change of the broken RFID. For the change of RFID, we separate the cast and body of the packaging. Also, we present the detail drawing for the proposed construction material RFID packaging and implement the performance evaluation of the packaging manufactured using 3D printer.

Characteristics of Frequency Band on EEG Signal Causing Human Drowsiness

Abstract: We measured and analyzed the brain waves to observe the characteristics of human drowsiness. The basic method is to analyze the EEG(Electroencephalography) signals from subjects according to the frequency bands. It has been reported that alpha waves are related to a wakefulness state, an eye closure state and a state that begins to sleep. In this study, therefore, we restricted the frequency band for analyzing to between 8 and 13Hz called brain's alpha waves. We observed which components had a stronger influence on human drowsiness among the restricted frequency band and represented the experimental results to analyze using the power spectrum method.

Implementation and Analysis of 3D Fish Encyclopedia for Children Education in Mobile Environment

Abstract: Various study for technology of agmented reality by using mobile has been progressed in aspect of advantages for mobility and popularity, recently as technology of agmented reality is developing day by day. Mobile agmented reality is technology imaginary informations are grafted into reality by using mobile. That can induce new learning experience showing high interest and interesting for infant education. This thesis is a fishes encyclopedia for infant that was made by displaying pictures as 3D fish model. 3D fish model is possible to turn on the six axis and enlarge and reduce by demand of users. Furthermore, it was made for inducing interesting about book for infant by inserting various sound effect. The resort of using system for infant shows interest and interesting over four times in case infant will learn with fishes encylopedia not previous books.

Noise Reduction Algorithm in Speech by Wiener Filter

Abstract: This paper proposes a noise reduction algorithm using Wiener filter to remove the noise components from the noisy speech in order to improve the speech signal. The proposed algorithm first removes the noise spectrums of white noise from the noisy signal based on the noise reshaping and reduction method at each frame. And this algorithm enhances the speech signal using Wiener filter based on linear predictive coding analysis. In this experiment, experimental results of the proposed algorithm demonstrate using the speech and noise data by Japanese male speaker. Based on measuring the spectral distortion (SD) measure, experiments confirm that the proposed algorithm is effective for the speech by contaminated white noise. From the experiments, the maximum improvement in the output SD values was 4.94 dB better for white noise compared with former Wiener filter.

Relationship between Job Characteristic and Quality of Life among some Elderly

Abstract: This study is to provide basic data on the jobs program to identify the relevance of the professional activities and quality of life of the elderly and the elderly, were performed using the National Health and Nutrition Examination Survey.. Survey population of 1,472 patients were 65 years of age or older. The survey method, t-test, ANOVA and multilevel regression analysis was used. This study result of quality of life of elderly people with a job, unemployed elderly people appeared to be higher than the quality of life(β=0.041, p=0.000). In work mode regular workers was an average of 0.93 points((p=0.005), in working hour full-time average 0.91 points(p=0.079), in job classification professional average 0.91 points(p=0.044) the higher the quality of life. Elderly business jobs, there is a need to improve the quality of life of the elderly to consider the results of this study work business.

A Study on Leisure Activity Type of High School Students

Abstract: This study elects 934 high school students in Kwangju, conducts the survey of the actual condition of the youn ..s leisure, and comes to a conclusion as follows. the young spend mean 9-10 hours a day on class, mean 6 hours on sieeping, and mean 1-2 hours on self-learning. their spending money is less than 30,000 won and is not enough as the past years. While 33.2% of respondents answered they were trained for leisure activities, 66.8% were not. Also thesurvey indicates that 79.9% of the young think a leisure course will be contribute to sound youth. In kinds of leisure, the young prefer computer game, watching TV, video game, or listening to music which are not active. It is required to guide them to enjoy active leisure activities together. the young think their leisure time is not enough, average(41%) and not enough(37.5%). Especially, thy cannot have enough time to enjoy leisure(62.5%). The young are not satisfied of leisure facilities.

Scientometric Analysis of Autonomous Vehicle through Paper Analysis of each Nation

Abstract: 본 논문에서는 자율 주행 자동차의 연구 방향을 결정하기 위한 국가별 논문 분석을 통한 계량정보 분석을 수행한다. 이를 위해 국가별 수준 분석, 국제협력연구 네트워크 분석을 통하여 자율 주행 자동차의 연구 동향을 확인한다.

A Study on Improved Method of Voice Recognition Rate

Abstract: In this paper, we suggested a method about the improvement of the voice recognition rate and carried out a study on it. In general, voices were detected by applying the most widely-used method, HMM (Hidden Markov Model) algorithm. Regarding the method of detecting voices, the zero crossing ratio was calculated based on the units of voices before the existence of data was identified. Regarding the method of recognizing voices, the patterns shown by the forms of voices were analyzed before they were compared to the patterns which had already been learned. According to the results of the experiment, in comparison with the recognition rate of 80% shown by the existing HMM algorithm, the suggested algorithm based on the recognition of the patterns shown by the forms of voices showed the recognition rate of 92%, reflecting the recognition rate improved by about 12% compared to the existing one.

On the Availability of Anti-Forensic Tools for Android Smartphones

Abstract: Smartphone is very useful for use in the real life through the improvement of computing power, faster data rate and the variety of applications. On the other hand, using the smartphone has been exposed to a lot of crime. Also, it occurs attempting to delete a data of smartphone memory by anti-forensic tools. In this paper, we investigate and analyze the anti-forensic tools used in the Android smartphone to study the characteristics and techniques of anti-forensic tools. In addition, experiments are performed to validate the availability of anti-forensic tools by the Oxygen Forensic Suite that is a commercial forensic tool.

The Optimization using PCB EM interpretation of GEO satellite's L Band Converter

Abstract: This study is the analysis and verification process of the L-band satellite communications repeater thought PCB & circuit EM analysis. System performance can be vulnerable to various spurious inside the L-band satellite transponder, power conversion board, digital signal board, TM/TC board, such as control panels and blocks that are linked signal components when the winch is increased due to the noise component. So the whole system can cause performance degradation. PCB resonance analysis and EM simulation can be easily analyzed for a variety of optimal. Also, by setting the ports on the PCB, H/W designer wants to can easily analyze system.

A Study on Development of Technology System for MIS(Minimally Invasive Surgery) robot of S. Korea analysed by the Application of Scenario Planning

Abstract: This study is about development of technology system for MIS(Minimally Invasive Surgery) robot of S. Korea analysed by the application of scenario planning. MIS robot industry receive attention as a new growth industry for national and international and is noticeable for the leading industry of future era in Korea. In this paper was examined the characteristics of an MIS robot technology and its components. It was investigated about the technology of an overseas MIS robot(especially U.S.A) and Korean domestic MIS robot and understood such as the country`s policy propulsion issues then, was searched about development direction of the future. As a result, the future policy for MIS robot of S. Korea is to further spur the development of new MIS robot technology and more improvement of the technology level of MIS robot with AR(Augmented Reality) display.

Service Realization of WAVE based Vehicular Communication Systems in the Testbed

Abstract: Vehicular communication is one of representative convergence technology which combines information technology and vehicle industry. Wireless Access in Vehicular Environments (WAVE) technology is vehicular communication standard which is widely used in the world. In this paper, we introduce service realization of WAVE based vehicular communication systems in the practical testbed. We review the overall WAVE based systems in brief and introduce the testbed. Then, we investigate various applications using vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) communications. Based on realization of systems, we discuss practical implementation issues and the convergence area of WAVE systems.

A Study on Adolescents` Misconceptions about Oral Health Knowledge in Some Areas

Abstract: This study was conducted to provide basic data in establishing a method for helping adolescents form the concept of correct oral health knowledge, by searching for their misconceptions about oral health knowledge and figuring out relevant factors. Results showed that they had appropriate knowledge on a relatively large number of questions regarding the level of oral health knowledge, but they also had misconceptions about the toothbrush grip, how to use medicines for gum diseases, and the project of fluorine concentration adjustment in water. It was shown that the score of oral health knowledge turned out to be 10.78 on average as a whole and the mean difference was within the error range. As for the correlations of misconceptions about oral health knowledge by group, it was noted that there were no differences in gender and education level, but those who completed oral health education had more appropriate concepts than those who did not (p < 0.001). In terms of the paths that they obtained oral health knowledge, the Internet and mass media (35.4%) had the highest rate and school (9.6%) had the lowest rate. With regards to the level of oral health knowledge, school had 10.56, which was the lowest score. In this regard, in order for adolescents to form adequate oral health knowledge, the following should be done. therefore, it would be necessary to activate school oral health education so as for adolescents to exercise adequate oral health behavior and to train many oral health educators so as for them to be provided with more educational opportunities.

A Study on the Sensor Node Based Wireless Network Communication System for Efficient EEG Transmission

Abstract: 뇌파 건강관리 시스템의 태동은 산업과 연구분야에서 요즘 중요한 쟁점으로 여겨지고 있다. 실시간으로 간질병이나 뇌경색의 환자들의 의료응급서비스를 지원하기 위해서는 EEG신호 감지가 필수적이다. 이러한 시스템을 위하여 효과적인 네트워크를 지원하는 것이 필수적이기 때문에 센서노드 기반의 무선통신 토폴로지를 제안하며 시뮬레이트한다. 마지막으로 이러한 네트워크의 효과적인 토폴로지를 위하여 옵넷 시뮬레이터의 결과를 평가한다.

Association of Demographic Characteristics and Delinquent Behaviors and Level of Stress among Korean Senior High School Students

Abstract: This study tried to investigate the relationships between demographic characteristics and delinquent behaviors factors of the Korean high school students and their level of stress. The 2009 Korean Youth Health Risk Behavior On-line Survey data was used for this study. It selected 35,668 cases of senior high school students from the raw dataset and conducted a secondary data analysis. Frequency analysis, t-test, F-test were conducted for this study. Gender, living with parents, economic status, school type, grade, academic record, internet addiction, problem drinking, smoking were significantly associated with their level of stress. Findings may be used for coping with stress among the Korean senior high school students.

Disabled People of activities of daily living and quality of life relationship

Abstract: This study investigated the quality of life, activities of daily living, and 20 years of age or older and disabled people living in Gwangju, Naju area. Performance of Basic daily life activities and instrumental activities of daily living, and quality of life were investigating the extent to Learn these correlations, bivariate correlation analyzes were conducted. The results showed lower quality of life, lower performance of activities of daily living was instrumental activities of daily living, quality of life and more relevant. Through this study of disabled people, more independent and to lead the life of quality is high, it is trying to be helpful in the future.

Embedded-based Power Monitoring Security Module Design

Abstract: The demonstration project of the electrical grid for Smart grid is progressed, the smart digital appliances AV technology, Smart home energy management technology charging the management function of complex energy for the automation management of air conditioning and heating, humidity and air, the health care technology charging the design of housing for the elderly and disabled and the measurement of individual bio information, and the Smart home security technology dealing with the biometric security and motion sensors, etc. have been studied. The power monitoring terminal which uses a variety of wired and wireless networks and protocol is the target additionally to be considered in addition to the security vulnerabilities that was occurred in the existing terminal. In this research paper, the author analyzes the cryptographic techniques corresponding to the smart meter occurred by the problems that are exposed on the outside which are vulnerable to physical attacks, and intends to propose the design of the security systems for the Smart meter terminal being able to maximize the efficiency of the terminal.

The Relationship between Metabolic Syndrome and Quality of Life in Korean Adult Women

Abstract: Metabolic syndrome is the most important risk factors of cardiovascular diseases So, it is judged that Quality of life of persons with metabolic syndrome inevitably deteriorate. For the purpose, the study aims to analyse the number of risk factors, and the relationship between abnormality of each risk factor and Quality of life, targeting adult women aged more than 19. For this study, data from the National Health and Nutrition Behavior Survey in 2007 and 2008 were incorporated and 4,365 subjects were collected for the study. Version 17.0 SPSS was used for data analysis. Statistical significance was defined as p

A Novel Clustering Method with Time Interval for Context Inference based on the Multi-sensor Data Fusion

Abstract: Time variation is the essential component of the context awareness. It is a beneficial way not only including time lapse but also clustering time interval for the context inference using the information from sensor mote. In this study, we proposed a novel way of clustering based multi-sensor data fusion for the context inference. In the time interval, we fused the sensed signal of each time slot, and fused again with the results of th first fusion. We could reach the enhanced context inference with assessing the segmented signal according to the time interval at the Dempster-Shafer evidence theory based multi-sensor data fusion.

An Implementation of Vector Control of AC Servo Motor based on Optical-EtherCAT Network

Abstract: In this paper we propose implement technique of vector current control in order to verify performance of an AC servo driver that is able to easy control of motion with multi-axis in the robot. In doing do, we have developed the AC servo driver to driving PMSM, and then we confirm that this driver whether operating or not normally by controlling of vector current. The vector current control was performed at the no load condition in PMSM. Then we compare command control and tracking control. As a result of verification, we recognize we get a satisfactory result.

Words Recommendation Algorithm for Similarity Connection based on Data Transmutability

Abstract: Big data which requires a different approach from existing data processing methods, is unstructured data with a variety of features. The features mean the volume of data, the rate of change of the data, the data with a variety of features. Tweets of twitter in only Korea are more than 5 millions per day. So much cheaper data storage and analysis system due to the increasing demand for information, the value of research is increasing. In this paper, the technology required by the deformation characteristics of the data elements as a technology priority-based word-based recommendation algorithm is proposed.