평행봉 2회전 뒤돌아 무릎 구부려 내리기 동작의 운동학적 분석

이종훈 ( Jong Hun Lee ),이용식 ( Yong Sik Lee ) 한국운동역학회 2004 한국운동역학회지 Vol.14 No.1

J. H. LEE, Y. S. LEE. Kinematic Analysis of Double Backward Somersault on the Parallel Bars. Korean Journal of Sport Biomechanics, Vol. 14, No. 1, pp. 27-40, 2004. The purpose of this study was to provide basic data for improving athletic performances by analyzing the kinematic variables of the Double Backward Somersault on the Parallel Bars through the 3D motion analysis. The subjects in this study were 5 male gymnasts who were ranked as national athletes. The results are as follows. 1. A total time(Mean Time) of performance showed 2.72±0.82 sec. and flight time to landing after releasing was o.87sec.(mean). In order to perform better stable flying movement, the flight time should be increased. 2. In the change of velocity of the center of mass, when the increasing ascension velocity of the upper point was high, the position in the top point was high on releasing. 3. In the position variable of the center of mass, the mean of upper-bottom position in horizontal posture was 242.1±6.5cm, 232.8±6.4cm in releasing, and 265.0±5.6cm in the highest point. This result is explained that the position of center of mass can be raised by using elastic power when wrist raised the bar in the releasing movement. 4. The angle of shoulder joint was 271.1±14.0. Such a big angle influences a negative effect on the releasing velocity, because trunk is not a position in the enough vertical direction. 5. The ankle of hip joint in hand-standing was 191.1±5.9, 118.8±5.3 in releasing, and 122.3±5.3 in taking on. Therefore, the result suggests that trunk should be straightly raised in taking on.

알긴산소오다 함량이 실험적 알지네이트 인상재의 압축변형율, 탄성회복율 및 압축강도에 미치는 영향

이용식,최부병,이성복,Lee Yong-Sik,Choi Boo-Byung,Lee Sung-Bok 대한치과보철학회 2003 대한치과보철학회지 Vol.41 No.2

The purpose of this study was to search the influences of the increase of the contents of sodium alginate in the experimental alginates on the some mechanical properties. 3 commercial alginates were selected for the purpose of comparison of the results of experiments. 7 experimental alginates were manufactured with the rise of contents of sodium alginate from 8.8% to 18.3% with the decrease of contents of diatomaceous earth and with the constant contents of calcium sulfate 12.5%. sodium phosphate 2.2%, zinc fluoride 2.0%. Splitable metal mold with 12.5mm diameter and 20.0mm height was filled with mixed alginate to prepare the cylinder shaped specimens. Strain in compression, elastic recovery, compressive strength were tested using the ISO specification number 1563, alginate impression material. Experimental groups were 7, and 10 specimens were used for each test items and each groups. Following results were obtained ; 1. Strain in compression was decreased with the increase of sodium alginate contents (p=0.0077, r2 = 0.6302). 2. Elastic recovery was decreased with the increase of sodium alginate contents but was not significant(p=0.0639, r2=0.7449). 3. Compressive strength was increased with the increase of sodium alginate contents (p<0.0001, r2 = 0.9617). These results mean that the increase of sodium alginate contents make alginate harder but may result the increased permanent deformation.

전치 유도각의 인위적 증가에 의한 저작근과 하악 운동 양상의 변화에 대한 연구

이용식,최부병,Lee, Yong-Sik,Choi, Boo-Byung 대한치과보철학회 1998 대한치과보철학회지 Vol.36 No.2

This study was performed to measure the changes of the mandibular movement and the masticatory muscular activities - anterior temporal and masseter muscle of both side - reflected by intentional increase of anterior guidance angie. For this study, 5 volunteers (3 males and 2 females with average age of 24.0) were selected. Each volunteer had Angle's classification I and did not have any missing tooth except third molar and any extensive restorations. Metallic guide plate was made at volunteer's working model fabricated by improved dental stone and cemented to the palatal surface of maxillary central incisor using resin cement(Panavia $21^{(R)}$) and then adjusted not to give any occlusal interferences at intercuspal position. The activity of masticatory muscles and the changes of mandibular movement were recorded by EMG and Sirognathograph in Biopak analysing system(Bioresearch Inc., Milwaukee, Wisconsin, USA). Measurement was done at before experiment, immediatley after placement, 1 week after placement, immediately after removal, and 1 week after removal. The results were as follows: 1. Moderate phonetic disturbance and mild headache were occured to 3 volunteers for 2 days after setting and 1 volunteer had positive reaction to percussion and slight midline diastema. But all of these clinical signs were diappeared 1 week after removal and the other volunteer did not have any special clinical sign. 2. In the EMG of the mandibular rest position, the mean value of anterior tempotal muscle was increased immediately after placement(p<0.01) and then decreased 1 week after placement(p<0.05) and increased 1 week after removal(p<0.05) but not recovered as before experiment. The mean value of masseter muscle was decreased during the experiment period. 3. In the EMG during mandibular protrusive movement, all muscular activity was decreased during the experiment period. Reduced activity was not recovered 1 week after removal(p<0.03). 4. During the habitual opening, anteroposterior movement of mandible was decreased immediately after placement(p<0.05) and then increased 1 week after placement but not statistically significant(p>0.1). Vertical movement was not shown significant difference during the experiment period(p>0.1). Lateral movement was decreased immediately after placement(p<0.05) and then increased 1 week after placement but not recovered as before experiment. The opening and closing velocity of mandible was shown minor changes but not statistically significant. 5. During the habitual opening, anteroposterior movement of mandible was decreased 1 week after placement(p<0.05) and then increased immediately after removal and recovered 1 week after removal as before experiment. Vertical movement was not shown significant changes. Lateral displacement of mandible was increased continuously and recovered 1 week after removal. Opening velocity was temporarily increased immediately after removal but recovered and closing velocity was not shown significant changes. 6. During the right side chewing, anteroposterior movement of mandible was increased immediately after removal but recovered and vertical movement was not shown statistically significant results. Lateral displacement and velocity of mandible were not shown significant results. 7. During the left side chewing, the changes of mandibular movement pattern were not shown statistically significant results.

Disciplinary Sport Administration / Management : 체육행정의 연구동향과 학문적 과제에 관한 고찰

이용식,김종필 ( Yong Sik Lee,Jong Pil Kim ) 한국체육학회 1996 국제스포츠과학 학술대회 Vol.1996 No.2

참조연계 서비스 구현을 위한 참고문헌 식별자 매칭 시스템

이용식,이상기,Lee, Yong-Sik,Lee, Sang-Gi 한국과학기술정보연구원 과학기술정보센터 2010 Journal of Information Science Theory and Practice Vol.41 No.3

A reference linking service that is connection of each other different information resource need to setup the reference database and to match identifier. CrossRef, PubMed and Web Of Science etc. the many overseas agencies developed reference linking service, that they used the automatic tools of Inera eXstyles, Parity Computings Reference Extractor etc. and setup in base DOI and PMID etc. Domestic the various agencies of KISTI(Korea Institute Science and Technology of Information), KRF(Korea Research Foundation) etc are construction reference database. But each research communities adopts a various reference bibliography writing format. As, the data base construction which is collect is confronting is many to being difficult. In this paper, We developed the Citation Matcher System. This system is automatic parsing the reference string to metadata and matching DOI, PMID and KOI as Identifier. It is improved the effectiveness of reference database setup.

업체탐방-현대기계

이용식,Lee, Yong-Sik 한국발포스티렌재활용협회 2006 환경사랑 Vol.45 No.-

급성 후방십자인대 손상 환자에서 조기 재건군과 지연 재건군의 결과 비교

이용식,이수원,서병호,김윤기,Lee, Yong Sik,Lee, Soo Won,Seo, Byung Ho,Kim, Yoon Gi 대한관절경학회 2013 대한관절경학회지 Vol.17 No.1

Purpose: This study performed to compare degree of joint stiffness and clinical results between early and delayed reconstruction of acute posterior cruciate ligament (PCL) injuries. Materials and Methods: Thirty-two Patients who underwent PCL reconstruction between March 2008 and October 2011 enrolled this study. We performed transtibial single bundle reconstruction using the allo-achilles tendon in all cases. We divided the patient into two groups, early reconstruction group underwent surgery before a week, delayed reconstruction group underwent surgery after 3 weeks, before 6 weeks. All the patients underwent aggressive joint motion exercise till surgery and enrolled post operative rehabilitation program. We checked posterior drawer stress radiography, range of motion, the Lysholm score, the International Knee Documentation Committee (IKDC) score and the Tegner score to evaluate the results. Results: At the final follow up the Lysholm score was 92.1 in the early group and 93.8 in the delayed group. All the cases were rated above B (near normal) on IKDC score (p=0.808, p=0.722). The Tegner score was 6.6 in the early reconstruction group and 6.2 in the delayed group (p=0.480), The average of maximum flexion and extension angle was $133.9^{\circ}$, $1.4^{\circ}$ in the early group and $133.6^{\circ}$, $1.1^{\circ}$ in the delayed group (p=0.560, p=0.581), no complication such as deep vein thrombosis or infection, no difference in posterior drawer stress radiography (p=0.750). Conclusion: We could obtain satisfactory clinical results in both the early and delayed reconstruction groups of acute PCL injuries. Therefore, the early reconstruction of PCL performed before a week could be one of the treatment options for acute PCL injury.

Step 가변형 MPPT 제어기법과 DVR을 적용한 계통연계형 태양광 발전 시스템

이용식(Yong-Sik Lee),정성원(Sung-Won Jeong),김재현(Jae-Hyeon Gim) 한국조명·전기설비학회 2012 조명·전기설비학회논문지 Vol.26 No.8

Grid-connected photovoltaic generator system requires high performance PCS(Power Conditioning System) according to the standard of ‘Distributed Generation Grid-Connected Technology Standards’. This paper presents the MPPT control method which improves output efficiency through fast tracking to the maximum power point of PV and a reduced self-excited vibration. Secondly, in this paper DVR function was applied to PCS to compensate the voltage sag frequently happening for a power system. The proposed PCS control is analyzed and compared to conventional PCS operating characteristic, the various insolation and loads, and voltage sag condition through PSIM tool. It proves the utility.

Articles : A New Framework for Public Personnel Management : Toward Judicial Accountability

이용식 ( Yong Sik Lee ) 고려대학교 정부학연구소 1992 정부학연구 Vol.1 No.-

클레이 사격의 운동학적 분석

이용식(Lee Yong-Sik),백진호(Back Jin-Ho),윤상문(Yoon Sang-Moon) 한국체육과학회 2010 한국체육과학회지 Vol.19 No.3

In the experiment, it was performed to figure out the character of each individual athlete during single and double trap shooting matches. With the subject of one female member of the national team, a three-dimensional motion picture analysis method was utilized to analyze the center of body, gun aiming, and the angle of shoulder turning. The subject practiced enough before performing the experiment and shot three times each for single and double trap movements in the 3rd shooting area. Viewing the recorded motion picture, it was divided into well performed movement (A) and wrongfully performed movement (B) through consultation of the athlete herself and a professional. The moving distance of the center of mass showed similar results between well performed movement and wrongfully performed movement, but it should smooth movement in the well performed movement. The locus of the movement of gun aiming showed greater movement in the well performed movement, and regarding the angle of shoulder turning, it showed almost similar form between well performed movement and wrongfully performed movement. For double trap, it showed greater angle of shoulder turning in well performed movement, and for single trap, it showed greater angle in the wrongfully performed movement.