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팔꿉관절 가쪽위관절 통증 환자에서 근위방향 가능적 마사지를 이용한 노쪽 손목 폄근 신장운동이 통증과 근력에 미치는 효과
정성대(Sung-dae Choung),하성민(Sung-min Ha),김수정(Su-jung Kim),박규남(Kyue-nam Park),권오윤(Oh-yun Kwon) 한국전문물리치료학회 2012 한국전문물리치료학회지 Vol.19 No.1
The purpose of this study was to identify the effects of two types of stretching extensor carpi radialis on the visual analog scale (VAS), pressure-pain thresholds (PPTs), grip strength (GS), and strength of wrist extensor (SWE) in patients with lateral epicondylalgia, Sixteen patients with lateral epicondylalgia were recruited for this study and randomly assigned to two groups; the conventional stretching group (CS) and the stretching of proximal functional massage group (PFM); the VAS, PPTs, GS, and SWE were measured before and after the intervention. Over a period of stretching exercises were performed for five minutes per day, five days per week. The paired t-test and Wilcoxon signed-rank test were used to determine the statistical differences in the VAS, PPTs, GS, and SWE (pre- and post-test). The Independent t-test and Mann-Whitney U test were used to compare the effects of stretching exercises between the CS and PFM groups. The results of this study demonstrated that in the PFM group, the PPTs, GS, and SWE significantly increased, and the VAS decreased (p<.05). In the CS group, the VAS and GS increased significantly after the three-week intervention (p<.05). Pain was decreased and strength (GS and SWE) was increased in the PFM group, compared to the CS group (p<.05). The findings of this study indicate that PFM technique can be applied for decreasing pain and increasing the GS and SWE in patients with lateral epicondylalgia.
차량 환경에서 통신 효율 향상을 위한 클러스터링 기반의 멀티채널 매체접속제어 프로토콜 개발
정성대(Sung-Dae Jung),이승진(Seung-Jin Lee),이상선(Sang-Sun Lee) 한국통신학회 2009 韓國通信學會論文誌 Vol.35 No.6
차량 간 통신에서는 무선 랜을 기반으로 한 연구가 활발히 진행 되고 있으며, IEEE 802.11p WAVE(Wireless Access in the Vehicular Environment)에서도 802.11a를 기반으로 한 방식을 채택하고 있다. 하지만 무선 랜 방식은 하나의 채널을 경쟁 모드로 사용하기 때문에 빠른 접속을 요구하는 차량 환경에서 경쟁을 회피하기 위해 CSMA/CA(Carrier Sense multiple Access / Collision Avoidance) 알고리즘을 사용하는 것은 찾은 충돌로 인한 통신 지연을 유발 할 수 있다. 본 논문에서는 차량 간 통신에서 이러한 문제점을 해결하고 신뢰성 있는 데이터 전송을 지원하기 위하여 차량 환경에 적합한 클러스터링 기반의 멀티채널 매체접속제어 프로토콜을 설계하고 설계된 프로토콜을 바탕으로 차량 간 통신에 적합한 채널 조건을 확인하였다. 클러스터 헤드를 통해 각 채널을 관리하고 채널을 할당함으로써 기존 경쟁 기반의 싱글 채널을 사용함에 따라 생기는 패킷 충돌 및 통신 지연을 60%이상 줄이는 것을 시뮬레이션을 통해 확인 하였다. In VANET(Vheicle Ad hoc Network), the researches based on the wireless LAN are conducting and the method based on 802.11a is being adapted in IEEE 802.11p WAVE(Wireless Access in Vehicular Environments). However, wireless LAN which uses a single channel in a competition can cause transmission delays because of a frequent collision and a use of CSMA/CA to avoid competition in VANET requiring a fast access. In this paper, we designed CMMP (Clustering based Multi-channel MAC protocol) adequate to VANET and then confirmed the appropriate channel conditions in a V2V communication on the basis of this protocol. The simulation results showed that a packet collision and a transmission delay by the use of an existing single channel based on the contention decreased more than 60% by CMMP.
운동면과 어깨 관절 굽힘 각도가 어깨뼈 내밈 운동 시 어깨뼈 위쪽 돌림근에 미치는 영향
정성대 ( Sung Dae Choung ),원종혁 ( Jong Hyuck Weon ),정도영 ( Do Young Jung ) 대한물리의학회 2013 대한물리의학회지 Vol.8 No.1
PURPOSE: This study was to determine the effect of the plane of movement (sagittal plane vs. scapular plane) and shoulder flexion angle (90° vs. 130°) during scapular protraction exercises in healthy subjects by investigating the elecromyographic (EMG) activities of the serratus anterior (SA), upper trapezius (UT), and pectoralis major (PM). METHODS: Twenty-one healthy subjects participated in this study. Subjects performed maximal scapular protraction at the 90° or 130° shoulder flexion angles in the sagittal or scapular planes. Surface EMG was recorded from the SA and UT, and PM muscles. Dependent variables were examined by 2 (plane) × 2 (angle) repeated measures of analysis of variance (ANOVA). RESULTS: Significantly increased EMG activities in the SA and UT were found during scapular protraction exercise at the 130° shoulder flexion angle in the sagittal and scapular plane. Also, EMG activity of the PM significantly decreased at the 130° shoulder flexion angle in the sagittal plane and the 90° and 130° shoulder flexion in the scapular plane. CONCLUSION: we recommend scapular protraction exercise at the 90° shoulder flexion in the sagittal plane to selectively strengthen the SA muscle with limitation of upper trapezius activity and at the 130° shoulder flexion in the scapular plane to selectively strengthen the SA muscle with limitation of pectoralis major activity.
박경윤,정성대,예재길,서일복,Park, Kyoung-yoon,Jung, Sung-dae,Yeh, Jae-gil,Seo, Il-bok 대한수의학회 1994 大韓獸醫學會誌 Vol.34 No.3
This study was carried out to investigate the necrotic enteritis of chicken in Korea. Epidemiological, pathological and microbiological examination were done on 12 naturally occurred cases of necrotic enteritis of chicken. And the susceptibility of isolated bacteria to antimicrobial agents was also examined. The results obtained were as follows; 1. The Clostridium perfringens infection, necrotic enteritis of chicken, occurred in the chickens mainly raised in floor pens. Necrotic enteritis of chicken was occurred coincidently with coccidiosis and Gumboro disease frequently. And several cases were recurred at 2-3 weeks after recovery. 2. Clinical signs of the infected chickens were depression, decreased appetite, reluctance to move, diarrhea, ruffled feathers and acute death within several hours. 3. The characteristic biochemical properties of isolates were 2-band hemolysis, no motility, positive reaction of reverse CAMP test and the formation of LV precipitate in egg yolk medium. 4. Gross lesions of the infected chickens were distention of intestine with gas, thickened mucosa and formation of thick pseudomembrane in intestine. Livers were friable with yellowish brown color and, in some case, showed demarcated necrotic foci. 5. Histopathological findings of the infected chickens were severe necrosis of the intestinal mucosa and attachment of numerous large bacilli to the mucosal surface of necrotic villi. In liver, necrosis of liver tissue and numerous large bacilli in the necrotic foci were also observed. 6. In susceptibility test to antimicrobial agents, 12 isolates of Clostridium perfringens were highly sensitive to ampicillin, baytril, cephalothin and penicillin.
차량 간 통신을 위한 IEEE 802.11 라우팅 프로토콜 성능 분석
김상헌(Sang Heon Kim),정성대(Sung Dae Jung),장상우(Jang Sang Woo),이상선(Sang Sun Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this thesis, we analyze the performance of the IEEE 802.11 Ad-hoc network for v2v communication under a vehicular environment, focused on two main aspects. Those are the throughput and the fairness which related to QoS(Quality of Service). Through the results of the analysis, I figure out the fundamental problem of multihop network and the effect of mobility. Some suggestions for future researches are followed.