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Kinetic Analysis of the Dwigongjungdorachagi in Taekwondo
Jeongki Lee,Hyotaek Lee,Boseob Heo J-INSTITUTE 2022 International Journal of Martial Arts Vol.7 No.1
Purpose: The purpose of this study is to provide the basic data for technical performance by analyzing and presenting the differences in major kinematic factors in the jumping phase, flight phase, and finally striking phase for national team and non-national team male demonstration members. Method: As for the subjects of this study, 6 members of the national team and 6 members of the non-national team who had more than 3 years of demonstration experience were selected and tested. Before entering the ex-periment, a consent was secured from each subject, the experimental procedure was explained, and kinematic data were collected by using 14 high-speed digital cameras. For the statistical processing of this study, the mean and standard deviation (M±SD) were calculated by using Excel 2018, and the statistical program (SPSS 22.0, SPSS Inc., Chicago, IL, USA) was used to verify the difference in kinematic variables of dwigongjungdorachagi motion. The Shapiro-Wilk verification was conducted to confirm the normality of the collected data, and according to the results, an independent sample test (independent t-test), test (Mann-Whitney U-test), and the correlation analysis were performed. Results: There was a statistically significant difference in P3 (p<.05) of the required time phase. There was a statistically significant difference in E4 (p<.05) of the (Z) movement displacements. There was a statistically significant difference in the right E4 (p<.05) of the right ankle joint angle. The correlation coefficient between the body center’s displacement and flight time showed a high correlation and showed a statistically significant difference (r=.953, P=.001). The correlation coefficient between the angular velocity and the body center’s displacement showed a high correlation and showed a statistically significant difference (r=.809, p=.001). The correlation coefficient between the angular velocity and flight time showed a high correlation and a statistically significant differ-ence (r=.809, p=.001). Conclusion: As a result of the experiment, the swing speed of the arm and the angle of the knee joint before jumping during dwigongjungdorachagi provided a great force to project the human body into the air and also had the effect of increasing vertical ascent. Hence, it is apparent that the coordination of movements is a very important factor.
이원석(WonSuk Lee),박경용(KyoungYong Park),양영종(YoungJong Yang),정효택(HyoTaek Jeong),김순용(SoonYong Kim),이규철(KyuChul Lee) 한국정보과학회 1997 한국정보과학회 학술발표논문집 Vol.24 No.1B
최근 들어, 인터넷은 다양한 정보 제공자에 의해 광범위한 분야의 정보를 멀티미디어 형태로 전달한다는 점에서 매우 각광을 받고 있다. 이와 같은 광범위하고 다양한 인터넷 정보 중에서 자신이 원하는 정보 자원을 정확하게 많이 얻어 낼 수 있는 방법의 제공은 사용자가 인터넷 정보 자원을 재활용하여 사용할 수 있다는 점에서 매우 중요한 문제가 아닐 수 없다. 현재 인터넷 상에서 원하는 정보 자원을 찾기 위해 이용되는 각종 탐색 엔진은 정확한 메타데이타를 제공해 주지 못하고, 멀티미디어 데이타와 사용자가 필요한 메타데이타를 부가하기 힘들다는 단점 때문에 궁극적인 메타데이타 해석을 위한 시스템으로 활용하기 힘들다. 따라서, 본 논문에서는 인터넷 정보 자원의 내용 및 위치 정보 등의 메타데이타를 관리 및 해석하기 위해 SeriCore라는 SGML(Standard Generelized Mark-up Language) DTD(Document Type Definition)를 정의하고, 멀티미디어 데이타에 대한 메타데이타를 효율적으로 저장하고 검색, 관리할 수 있는 해석기를 설계 및 구현하였다.
Nanostructured Change of SIS (Styrene-Isoprene-Styrene) Triblock Copolymer by Elongational Flow
Lee, Won Ki,Lim, Hyotaek,Kim, Eun Young American Scientific Publishers 2008 Journal of nanoscience and nanotechnology Vol.8 No.9
<P>Elongation deformation was conducted on a polystyrene-block-polyisoprene-block-polystyrene (SIS) triblock copolymer which contains cylindrical microdomains composed of polystyrene block chains in matrix of polyisoprene block chains. The extensional flow behavior of this deformation triblock copolymer melt, which exhibits a cylindrical phase, has been examined by using elongational deformation with <I>ε</I>o between 0.1 and 1.0 s<SUP>−1</SUP> at different temperatures. The structures related to various condition of elongational flow deformation has been determined from SAXS patterns by considering separately changes in the single particle scattering, which influence the scattering patterns. The TEM and SAXS data of the samples show that the cylindrical PS-domain was deformed along the direction of elongation. It also shows that the cylindrical microdomains are micronecked and deformed with various strain rates.</P>
An Efficient Framework for Computation Offloading In Mobile Cloud Computing
Zhijun Zhang,HyoTaek Lim,Hoon Jae Lee 한국정보통신학회 2014 2016 INTERNATIONAL CONFERENCE Vol.6 No.1
With the emergence of mobile cloud computing (MCC), Mobile applications are becoming increasingly, there is a significant increase of mobile subscriptions, the drives need a strong demand for mobile cloud applications and services for mobile device users. However, mobile terminals are resource-constrained and therefore, running these applications directly on it is not satisfactory given a user’s expectations. This paper proposes a novel offloading service that can seamlessly offload some of the tasks of a mobile application from mobile terminals to cloud. Offloading computation to the cloud effectively expands the usability of mobile terminals beyond their physical limits, and also greatly extends their battery charging intervals through potential energy savings. The system architecture and key components of the proposed offloading service are presented, prototyped, and evaluated. The results of experiments and simulations have demonstrated the effectiveness and efficiency of this offloading service for mobile applications.
An Analysis of Security System for Intrusion in Smartphone Environment
Louk, Maya,Lim, Hyotaek,Lee, HoonJae Hindawi Publishing Corporation 2014 The Scientific World Journal Vol.2014 No.-
<P>There are many malware applications in Smartphone. Smartphone's users may become unaware if their data has been recorded and stolen by intruders via malware. Smartphone—whether for business or personal use—may not be protected from malwares. Thus, monitoring, detecting, tracking, and notification (MDTN) have become the main purpose of the writing of this paper. MDTN is meant to enable Smartphone to prevent and reduce the number of cybercrimes. The methods are shown to be effective in protecting Smartphone and isolating malware and sending warning in the form of notification to the user about the danger in progress. In particular, (a) MDTN process is possible and will be enabled for Smartphone environment. (b) The methods are shown to be an advanced security for private sensitive data of the Smartphone user.</P>
A Margin-based Face Liveness Detection with Behavioral Confirmation
Tolendiyev, Gabit,Lim, Hyotaek,Lee, Byung-Gook The Institute of Internet 2021 International Journal of Internet, Broadcasting an Vol.13 No.2
This paper presents a margin-based face liveness detection method with behavioral confirmation to prevent spoofing attacks using deep learning techniques. The proposed method provides a possibility to prevent biometric person authentication systems from replay and printed spoofing attacks. For this work, a set of real face images and fake face images was collected and a face liveness detection model is trained on the constructed dataset. Traditional face liveness detection methods exploit the face image covering only the face regions of the human head image. However, outside of this region of interest (ROI) might include useful features such as phone edges and fingers. The proposed face liveness detection method was experimentally tested on the author's own dataset. Collected databases are trained and experimental results show that the trained model distinguishes real face images and fake images correctly.
The Design of an Efficient Proxy-Based Framework for Mobile Cloud Computing
Zhang, Zhijun,Lim, HyoTaek,Lee, Hoon Jae The Korea Institute of Information and Commucation 2015 Journal of information and communication convergen Vol.13 No.1
The limited battery power in the mobile environment, lack of sufficient wireless bandwidth, limited resources of mobile terminals, and frequent breakdowns of the wireless network have become major hurdles in the development of mobile cloud computing (MCC). In order to solve the abovementioned problems, This paper propose a proxy-based MCC framework by adding a proxy server between mobile devices and cloud services to optimize the access to cloud services by mobile devices on the network transmission, application support, and service mode levels. Finally, we verify the effectiveness of the developed framework through an experimental analysis. This framework can ensure that mobile users have efficient access to cloud services.