• Journal of the Korea Institute of Information Security & Cryptology
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• v.20 no.3
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• pp.79-91
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• 2010

In digital forensics, the creation time, last modified time, and last accessed time of a file or folder are important factors that can indicate events that have affected a computer system. The form of the time information varies with the file system, depending on the user's actions such as copy, transfer, or network transport of files. Specific changes of the time information may be of considerable help in analyzing the user's actions in the computer system. This paper analyzes changes in the time information of files and folders for different operations of the NTFS and attempts to reconstruct the user's actions.

• Journal of KIISE
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• v.44 no.4
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• pp.417-422
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• 2017

Anomaly detection is the identification of data that do not conform to a normal pattern or behavior model in a dataset. It can be utilized for detecting errors among data generated by devices or user behavior change in a social network data set. In this study, we proposed a new approach using rank correlation coefficient to efficiently detect abnormal data in devices of a building. With the increased push for energy conservation, many energy efficiency solutions have been proposed over the years. HVAC (Heating, Ventilating and Air Conditioning) system monitors and manages thousands of sensors such as thermostats, air conditioners, and lighting in large buildings. Currently, operators use the building's HVAC system for controlling efficient energy consumption. By using the proposed approach, it is possible to observe changes of ranking relationship between the devices in HVAC system and identify abnormal behavior in social network.

• Child Health Nursing Research
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• v.20 no.1
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• pp.39-48
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• 2014

Purpose: The purpose of this study was to examine the parenting of mothers with infants and preschoolers in an effort to determine types of parenting. Methods: The 32 participating mothers were interviewed and from the content of the interviews, their parenting was analyzed. Statements were categorized and analyzed according to the selected procedure. Results: The parenting of mothers was classified into positive reinforcement and negative reinforcement, including 55 significant statements and 14 categories. Positive reinforcement was categorized as frequent skin contact, giving pleasure, spending a lot of time with children, improving children's self-esteem, being sensitive to children's needs, realistic discipline, developing independence, listening to children, and understanding and respecting children's feelings. Negative reinforcement was categorized as overprotection, inconsistent attitude, negligence, negative educational behavior, and emphasis on obedience. Conclusion: These results suggest that systematic education should be provided for mothers to increase their ability to provide good parenting. It is expected that the findings of this study would be useful in the development of efficient educational programs.

• KDI Journal of Economic Policy
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• v.9 no.1
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• pp.3-26
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• 1987

본연구(本硏究)의 목적(目的)은 과거 2년간 삼저현상(三低現象)이 실질국민총생산(實質國民總生産), 수출(輸出), 수입(輸入)(유류도입액(油類導入額) 제외) 및 도매물가지수(都賣物價指數)에 미친 영향을 분석(分析)하는 데 있다. 분석(分析)에 있어서는 'Lucas의 비평(批評)'에 위배되지 않도록 하기 위하여 모형(模型)의 계수(係數)가 시간이 흐름에 따라 변화(變化)할 수 있도록 허용한 BVAR모형(模型)을 작성(作成)하여 사용하였다. 이에 따라 삼저효과(三低效果)를 국제금리(國際金利), 원유가격(原油價格), 달러화가치(貨價値) 등의 변동(變動)으로서의 순수한 가격효과(價格效果)와 이들 가격변동(價格變動)으로 야기(惹起)된 경제행위주체(經濟行爲主體)의 행동변화(行動變化)를 반영(反映)하는 경제구조변화효과(經濟構造變化效果)로 양분(兩分)하여 계산하였다. 분석결과(分析結果)에 의하면 구조변화효과(構造變化效果)가 가격효과(價格效果)에 못지않게 상당히 큰 것으로 계산되어, 대외여건(對外與件)의 급변(急變)에 대한 경제행위주체(經濟行爲主體)의 대응노력(對應努力)이 매우 중요했던 것으로 나타났다. 이는 어떠한 축약형모형(縮約型模型)을 사용하여 정책(政策)의 급선회(急旋回) 혹은 대외여건(對外與件)의 급변(急變)과 같은 시뮬레이션을 할 때에는 그 결과(結果)가 매우 부정확할 수도 있다는 것을 의미(意味)한다.

• Journal of Korea Game Society
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• v.12 no.6
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• pp.47-58
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• 2012

Video game industry has undergone the drastic changes for forty-year history. The purpose of this study was to gain an understanding of the historical evolution of the U.S. video game industry. To achieve this goal, this study has chosen the industrial organization model as the theoretical framework. This study found that the market structure as well as the market conduct in the U.S. video game industry changed drastically. This study concludes that the change of the market structure of the U.S. video game industry relates to the change of market conduct. This study could serve as the basis for future research on the economic analysis of video game industry.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.16 no.3
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• pp.21-28
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• 2016

File Time information has a significant meaning in digital forensic investigation. File time information in Linux Ext4 (Extended File System 4) environment is the Access Time, Modification Time, Inode Change Time, Deletion Time and Creation Time. File time is variously changed by user manipulations such as creation, copy and edit. And, the study of file time change is necessary for evidence analysis. This study analyzes the change in time information of files or folders resulting from user manipulations in Linux operating system and analyzes ways to determine real time of malware infection and whether the file was modulation.

• Journal of Broadcast Engineering
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• v.22 no.2
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• pp.234-239
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• 2017

A real-time violence detection algorithm based on a new descriptor using the magnitude and direction changes of movement in images is proposed. The descriptor was developed from the observation that the changes of violent actions are much larger than those of normal movements. Descriptor feature vectors consisting of descriptor values during several frames are obtained and these are inputs to SVM(Support Vector Machine) classifier for discriminating violence actions from and non-violence actions. Comparison experiments between the ViF(Violent Flow) and the proposed algorithm were conducted with three different types of datasets. The experimental results show that the proposed algorithm outperforms the ViF in every case.

• The Journal of the Korea Contents Association
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• v.11 no.12
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• pp.364-377
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• 2011

This study was done to evaluate the effects of a transtheoretical model (TTM) based exercise behavior improving program for older adults with hypertension on the stage of change, processes of change, decisional balance, exercise self-efficacy, blood pressure and physical activity. A non-equivalent control pre-post design was used for this study. The subjects were 41 adults over 65 years of age with hypertension who did not practice regular exercise. The experimental group (n=20) received the 8-week TTM based exercise behavior improving program. The control group received hypertension self care management education. Descriptive analysis, $x^2$-test, t-test, paired t-test were used for analyzing the data using SPSS for Windows 14.0. As a results, there was a significant increase in stage of change, total score for processes of change, behavioral process of change, exercise self-efficacy, total physical activity, and walking in the experimental group compared to the control group. But, there were no significant differences between the two groups on the experiential processes of change, decisional balance, and blood pressure. The results of this study suggest that a TTM based exercise behavior improving program has positive effects on improving exercise behavior among older adults with hypertension.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.5
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• pp.400-411
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• 2017

This study aimed to maximize the effectiveness of motionbeat rhythm exercise on obese women and its applicability in all fields of sports. In addition, this study aimed to propose a plan to promote continuous exercise for people to incorporate as a means to improve healthy lifestyle. The results showed several effects of EEG on health promoting behaviors. Electroencephalogram (Alpha Power) of the left prefrontal cortex showed to have a significant effect on health promotion activities, with respect to stress management, in the motion beat rhythm exercise group. Considering all research findings, we found that the 8-week motion beat exercise can be used as an appropriate and effective social sport program for overweight women as it brings forth positive changes in the prefrontal cortex that maximizes the pleasantness of and interest in health promotion activities relating to stress management. Moreover, we suggest that it can be a method to create an environment for overweight people to continuously participate in exercises by providing results from fun and relaxingactivities, rather than just creating simple physical effects.

• Smart Media Journal
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• v.5 no.3
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• pp.93-98
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• 2016

The literal meaning of loitering is "to lingering aimlessly or as if aimless in or about a place". And most criminals show this kind of act before they actually commit crime. Therefore, detecting this kind of loitering can effectively prevent a variety of crime. In this paper, we propose a loitering-detection algorithm using the Raspberry Pi. Proposed algorithm uses an adaptive difference image to detect moving objects and morphology opening operation to enhance the accuracy of detection. The loitering- behavior is being detected by using the center of gravity of the object to see the changes of angle; and pixel movement distance to determine the height of the object. When the loitering-behavior is detected, it outputs the alarm to tell the users by using the Raspberry Pi.