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인터넷의 교육적 활용 현황과 생물 관련 웹사이트의 변화
정영란,이우은 韓國生物敎育學會 2002 생물교육 Vol.30 No.3
The explosive growth of the Internet, presents enormous opportunities for students access information. Classroom use of the Internet is growing at an astonishing pace and changing the way of learning. But such change will not occur if teachers will shy away from using this new technology. A survey was conducted to investigate the Internet facility and teachers' perception about the Internet. To do this 192 secondary school science teachers were administered a questionnaire. 38%(n=74) was a male, and 62%(n=118) was a female. 45%(n=87) was a high school teacher, and 55%(n=105) was a middle school teacher. 71.9% of schools under the survey are equipped with the Internet and 72.9% of respondents indicated they have Internet access at home. The Internet access has grown twice since 1998. Nearly all(99.5%) the teachers used Internet and 87.5% of teachers implied it into their classroom. Male teachers had better technical skills using Internet than female teachers(p<.05), Nearly 40% of the teachers had changed their teaching techniques since using the Internet. Teachers indicated that the difficulties encountered in Internet use included cost problems(62.9%), the quality of information(17.2%), and technical supports(11.3%). Teachers were asked whether their school had an Internet policy. Only 24% teachers indicated that they had a policy. Teachers thought the specific strategies of using the Internet to match the educational objectives of a content area need to be developed. They need models for the successful implementation of the Internet into the secondary classroom, Internet use for educational purposes still needs to be structured and managed. Searching for middle school biology resources on the Internet was done using 5 search engines. Most biology related web sites(2500) were examined to investigate the change and characterization of the sites. 69 subdirectories were increased since 1998. Among them 155 useful web sites are chosen and characterized as a learning materialⅠ(31), a learning material Ⅱ(61), problem solving material(42), and activity material(21). Many korean science teachers created web resources to complement their particular curricular areas since 1998. But their Internet applications were primarily presenting instructions in a passive-learning format. They lack interaction, learner control, and feedback. On the contrary, foreign sites encompassed not only text but also hypertext, graphics, sound, and video. Domestic sites were found to be not continuously maintained, up-dated, and content-duplicated compared to the foreign sites.
MVC 상태에서의 무릎관절 모멘트 추정을 위한 모델 개발
남윤수,이우은,Nam, Yoon-Su,Lee, Woo-Eun 대한의용생체공학회 2008 의공학회지 Vol.29 No.3
This paper introduces a method of estimating the knee joint moment developed during MVC. By combining the Hill-type muscle model and analytic results on moment arm and musculotendon length change as a function of hip and knee joint angle, the knee joint moment at a specific knee joint angle during MVC is determined. Many differences between the estimated results and the experimental data are noted. It is believed that these differences originate from inaccurate information on the muscle-tendon parameters. The establishment of exact values for the subject's muscle parameters is almost impossible task. However, sensitivity analysis shows that the tendon slack length is the most critical parameter when applying the Hill-type muscle model. The effect of a change of this parameter on the muscle length force relationship is analyzed in detail.
엄현우(Hyunwoo Uhm),남윤수(Yoonsu Nam),이우은(Wooeun Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
In this paper, the development of model describing human gait motion and analysis of experiment of human gait motion are discussed. The aim of this paper is to compare and analyze the developed model with some real experiment. We first study modeling of gait motion of human. The Lagrange equation of motion is used to derive the governor equation. To consider the constraint conditions, the Lagrange multiplier and Holonomic constraint are used. And some proven data from precedential studies to verify the stability and accuracy of the proposed mathematical model are used. Then we analyze the experiment which we executed about human gait motion and compare it with precedential studies. Out of this process, We can demonstrate the derived equation which explains mathematical model of human gait motion compared with data of real human gait motion.