스포츠와 연관된 과사용 증후군: 주관절

오정환,금정섭,박진영,Oh, Jeong-Hwan,Keum, Jung-Sup,Park, Jin-Young 대한정형외과스포츠의학회 2008 대한정형외과스포츠의학회지 Vol.7 No.2

반복적으로 던지는 동작은 주관절에 심한 기계적인 스트레스를 주며, 주된 기전은 외반력이며 그 결과 내측 인장력과 외측 압박력, 후방부의 충돌현상이 발생한다. 성장기나 청년기에 지속적인 스트레스는 주관절에 해부학적 변화를 유발할 수 있다는 위험성을 운동선수와 가족, 코치들은 반드시 잘 이해하고 있어야 한다. 스포츠와 관련된 주관절 손상을 막기 위하여 적절한 운동법 교육, 워밍업, 의학적 전문 지식, 보호 장구 등이 필요하다. 또한 손상 예방과 재활은 적절한 투구 동작, 근력 강화, 견갑골에 대한 조절, 관절 운동 범위의 적절한 유지가 필수적이다. Repetitive overhead throwing exerts significant mechanical stress on the elbow joint. Pitching in baseball, serving in tennis, spiking in volleyball, passing in American football and launching in javelin-throwing can all produce elbow pathology by forceful valgus stress, with medial stretching, lateral compression and posterior impingement. This stress can lead to developmental anatomic changes in the young thrower. Asymptomatic pathology in the shoulder and elbow joint is prevalent and, with overuse, can progress to disabling injury. Joint injury occurs as a result of the body's inability to properly coordinate motion segments during the pitching delivery, leading to further structural damage. The implications of acute and overuse injuries and the possibility of permanent damage should be understood by parents, coaches and the athletes. Proper understanding of the intrinsic and extrinsic risk factors that could lead to elbow injuries is thus required. Measures to prevent elbow injuries should include proper coaching, warm-up, medical expertise and protective gear. Injury prevention and rehabilitation should center on optimizing pitching mechanics, core strength, scapular control, and joint range of motion.

회전근 개 질환의 자연경과

오정환,박진영,Oh Jeong-Hwan,Park Jin-Young 대한정형외과스포츠의학회 2004 대한정형외과스포츠의학회지 Vol.3 No.2

회전근 개의 전층 파열은 운동, 고정, 약물 등의 치료로 재생되기 어렵다. 파열은 시간이 지나면서 격심한 통증은 없어질 수 있으나, 대부분의 환자에서 어깨나 머리 위로 다시 움직일 때 증상이 재발된다. 작은 파열은 진행할 수 있으며, 광범위한 파열 시 통증이 감소될 수 있으나 점진적인 근력 약화가 동반된다. 치료 받지 않은 회전근 개 파열 환자의 일부는 견관절 관절염이 속발될 수 있다. 보존적 방법으로 치료하여도 증상이 지속될 때, 증상을 호전 시키고 기능을 회복시키는 가장 좋은 방법은 수술적 봉합이다. Continued research needs to be devoted to understanding the natural history of rotator cuff tears. Recent studies have shown progression of tear, symptomatic flare-ups and irreversible change in rotator cuffs managed nonsurgically. These data allow the grouping of patients with rotator cuff tears into three categories based on risk-benefit ratios. Nonsurgical care should be maximized for patients with impingement symptoms only, with partial-thickness tears, with chronic tears, and for the elderly patients. The proper selection of candidates for nonsurgical management should lead to the high success rate quoted by multiple authors. Even though conservative treatment is necessary, early surgery should be considered for tears that are acute, small or medium, associated with shoulder loss of function, or occur in a younger patient. Prolonged nonsurgical care in these patients risks tear propagation and irreversible changes to the cuff, which may complicate rotator cuff repair.

Legender 기호와 암호학

오정환,김철,Oh, Jeong-Hwan,Kim, Cheol 한국정보보호학회 1992 情報保護學會誌 Vol.2 No.2

본 논제에서는 원시근과 이차 잉여규를 중심으로 관련되는 암호학에 이용을 언급하기로 한다. 이외에도 이산로그(discrete logarithm), 연분수(conti-nued fraction), 여러 부정방정식(diophantine equation)의 이론등이 암호학에서 빈번히 사용되는 알고리즘의 근간을 이루는 이론들로 알려져 있다. 또한, 유사임의 수열(pseudo-random number sequence)을 만들기 위한 생성자 (generator)들 중에는 정수론에 기초하고 있는 것들이 않이 있다. 제2절에서는 정수의 위수와 원시근에 대한 성질을 논하고, 제 3절에서는 2차 잉여류와 Legender 기호를 소개한 후, 제4절에서 이들이 주로 사용되는 암호학의 분야를 논하기로 한다.

회전근 개 부전층 파열: 변연절제술가 봉합술

오정환,박진영,Oh, Jeong-Hwan,Park, Jin-Young 대한관절경학회 2005 대한관절경학회지 Vol.9 No.1

회전근 개 부전층 파열은 임상적으로 잘 알려진 질환이지만 이에 대한 수술적 치료 원칙은 명확히 정립되어 있지 않다. 파열된 회전근 개에 대한 치료법은 단순 변연절제술에서 견봉하 감압술과 퇴행성 파열 부위의 절제 및 봉합술까지 여러 가지 방법이 추천되고 있다. 수술은 관혈적 혹은 소 절개, 관절경적 술식을 시행할 수 있다. 관혈적과 관절경적 방법의 장단점에 따른 치료 방법을 결정할 때 정밀성과 이환률을 고려한다면 비슷한 위치를 가진다. 회전근 개 질환의 이환 정도를 결정할 때 관절면과 점액낭면 양쪽의 회전근 개를 관찰하고 치료 방침을 결정하여야 한다 때때로 파열이 이차적으로 발생할 수 있으므로 일차적인 병인을 고려하는 것이 중요하다. 부전층 파열은 일차적인 원인을 치료해야 하지만 심한 부전층 파열이 있는 경우는 관절경적 혹은 관혈적 방법으로 퇴행성 병변이 있는 회전근 개를 치료해야 좋은 치료 결과를 얻을 수 있다. Partial thickness rotator cuff tears (PTRCTs) are now a well-established clinical entity, yrt there is no consensus in regards to surgical management. Recommended treatment varies widely from simple debridement of the torn tendon to subacromial decompression to excision of the degenerative tendon and repair. Surgery may be performed using an open, arthroscopically assisted (miniopen), or entirely arthroscopic procedure. The advantages and disadvantages of open and arthroscopic procedures may lie in the balance between precision and morbidity. Visualization of both the articular and bursal surfaces is mandatory to determine the level of rotator cuff disease and formulate a treatment strategy. Because these tear often are secondary finding, recognition of the primary pathology is critical. Treatment of the primary problem usually remedies the partial tear. However, when there is significant PTRCT, an arthroscopic or open repair of the diseased tendon will give the most consistent results.

남자 중학생 역도선수들의 인상동작에 대한 운동학적 분석

오정환(Jeong Hwan Oh),김우람(Woo Ram Kim),배재희(Jae Hee Bae),홍수영(Soo Young Hong),신의수(Eui Su Shin),이정태(Jeong Tae Lee) 한국사회체육학회 2014 한국사회체육학회지 Vol.0 No.56

The purpose of this study is the impression of middle school men weight lifters to analyze kinematic behavior training coaches and athletes will be required to provide basic data. First, at phase 2 that belonged to the second pull phase, there was the shorted time required (0.36±0.04 s). Second, COM position was the biggest move in the vertical direction and especially, at event 3 and event 5. Third, there was the fastest move of COM velocity in the vertical direction and at event 2. Fourth, bar-centered position moved 0.19±0.06 m at event 2, and moved 0.17±0.04 m at event 3 forwards and backwards. Fifth, there was the fastest bar-centered velocity at event 3 that knee joint showed the maximum extension. Sixth, in relation to upper limb angles, shoulder joint showed the lowest angle at event 3. Seventh, in relation to lower limb angles, hip joint, knee joint and ankle joint all showed big angles at event 3 and 5 and especially, ankle joint showed the biggest angle at event 3. Eighth, out of upper limb angles, shoulder joint showed the fastest angular velocity at event 3. Ninth, in relation to lower limb angular velocity, hip joint and knee joint displayed the fastest angular velocity at event 2, and ankle joint displayed the fastest angular velocity at event 3.

선박평형수에 의해 유입된 생물종 성장 가능성 모의

오정환(Jeong-Hwan Oh),김충기(Choong-Ki Kim),백승호(Seung Ho Baek),신경순(Kyungsoon Shin),송용식(Yongsik Song) 한국해양환경·에너지학회 2011 한국해양환경·에너지학회 학술대회논문집 Vol.2011 No.11

선박평형수에 의해 유입된 다양한 수중생물들은 새로운 환경에 잘 적응하지 못하고 대부분 사멸하지만, 배출지역의 환경조건에 적응하여 살아남은 일부 종은 강한 생존력과 번식력으로 고유생태계를 교란 시킬 수 있다. 선박평형수에 포함된 외래생물종들의 잠재된 위험성 때문에, 선박평형수로 이동되어 다른 해역에 배출된 미세조류 또는 유해생물들이 배출 초기 주변수의 환경조건 (수온, 염분, 영양염 조건)에 성공적으로 정착할 수 있는지를 파악하는 것은 선박평형수 관리에 있어 매우 중요하다. 본 연구에서는 수역학수질모델(HEM-3D)을 이용하여 물리적 환경조건(예: 빛, 온도, 및 염분)에서의 외래 생물 종들의 성장을 모의하였다. 수치모델 결과는 배양실험결과에서와 마찬가지로 특정 수온 및 염분 조건에서 외래생물종이 재성장함을 보였다. Most phytoplankton species introduced by ship’s ballast water discharge tend to be extinct, but some species have ability to survive in sites for ballast water discharge and potential to disturb the native ecosystem. For a successful ballast water management, therefore, it is necessary to know if the invasive species introduced by ballast water can survive and regrow under the environmental conditions of surrounding water column. In this study, we simulated survivability of phytoplankton species introduced by ballast water discharge as a function of environmental conditions (i.e., light, water temperature, and salinity) using Hydrodynamic Eutrophication Model-3D (HEM-3D). The model results showed that some species were able to survive and regrow under specific ranges of water temperature and salinity, which is consistent with the results of laboratory experiments.

2011 대구세계육상선수권대회 Gilde Type 포환던지기 한국선수와 결승 1, 3위 선수와의 운동학적 비교분석

오정환 ( Chow Hwan Oh ),최수남 ( Su Nam Choi ),신의수 ( Eui Su Shin ),이정태 ( Jeong Tae Lee ),정익수 ( Ik Su Jeong ),배재희 ( Jae Hee Bae ),박승범 ( Seung Bum Park ) 한국운동역학회 2011 한국운동역학회지 Vol.21 No.5

The purpose of this study was to analyze, in real time, the glide motion and release motion of domestic athletes and gold and bronze medalists employing the glide technique for the men`s shot put at the Daegu World Athletic Championship in 2011. In the glide motion, the Korean athletes had a relatively high body center and shot put heights and lager stretching angles for their hips and knees. In the delivery phase, which shifts to the release phase, the Korean athletes showed slower vertical body center and shot put speeds, and they changed the phase, to the release phase by using a small body angle. In the release phase, the Korean athletes showed differences in their projection speeds and vertical body center speeds. The world-famous players showed high angle speeds, which refer to the composition of the rotation force at the moment of release (body, hip, and shoulder line). In the release phase, the Korean athletes did not have fully stretched hip and knee angles, which might have negatively influenced the vertical speed, because the Korean athletes showed relatively low projection heights and projection angles, it was found that they need to enhance the muscular power of their, throwing arms and lower limbs.

영상분석에 의한 수직점프의 생체역학적 분석

오정환(Jeong Hwan Oh) 한국체육교육학회 2001 한국체육교육학회지 Vol.5 No.2

The conditions of the vertical jump were two-fold ; one arm was fixed at some time, while neither arm was fixed at other times. It was found that the mass center of gravity changes based on the contact quantity of the vertical jump. A summary of the results, as determined by the analysis of visual and ter force plate, follows. 1. The angles of the hip joint and the knee joint were at a minimum, when two arms were used. 2. The angle of the ankle was at a minimum when both arms were fixed. 3. The vertical velocity of the mass center, the velocity of the lower segment joint, and the average angle velocity of the lower-segment joint were fastest, when both arms were used. 4. The average line velocity of the upper-segent joint was fastest when only one arm was used. 5. The impulse quantity of the maximum vertical jump was highest when both arms were used. 6. The maximum impulse quantity was largest when both arms were used.

2011 대구세계육상선수권대회 남자 포환던지기 결선경기의 운동학적 분석

오정환 ( Cheong Hwan Oh ),신의수 ( Eui Su Shin ),최수남 ( Su Nam Choi ),정익수 ( Ik Su Jeong ),배재희 ( Jae Hee Bae ),이정태 ( Jeong Tea Lee ),박승범 ( Seung Bum Park ) 한국운동역학회 2011 한국운동역학회지 Vol.21 No.5

This study had two purposes. The first was to analyze the period of the final record set by the male shot-putters in the IAAF World Championships, Daegu 2011 from the point of view of kinematics. The other was to identify an efficient movement for shot putting based on the analysis. The research used the eight finalists of in the championship as subjects. We analyzed the seven most important kinematic factors in shot putting based on the type of technique: the execution time of the delivery phase, release velocity, release angle, release, center of mass (COM) velocity, and shot trajectories, The analytical results showed the following average figures for the record 12 meters: execution time of the delivery phase: (0.19 s), release height: (2.06 m), release angle: (34.68°), release velocity: (13.25 m/s), angular velocity of shoulder: (922.38°/s), and angular velocity of pelvis: (479.50°/s). Further, the results showed that the highest COM velocity was 2.25 m/s and the shot trajectories were close to a straight line in the release phase.

급성 신우신염에 관한 임상적 관찰

오정환 ( Jeong Hwan Oh ),송창섭 ( Chang Sup Song ),최인재 ( In Jae Choi ),홍성훈 ( Sung Hoon Hong ),이종 ( Jong Lee ),이창화 ( Chang Hwa Lee ) 대한내과학회 1975 대한내과학회지 Vol.18 No.4