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정희석,찰리코즈리크 한국목재공학회 1983 목재공학 Vol.11 No.5
Press-drying was used an 0.25 inch-and 0.50 inch-thick flatsawn board of Oregon white oak heartwood at platen temperature of constant boiling point (212 F), constant lower plateau temperature (244 F) and combination of boiling point for 40 minutes and lower plateau temperature later by using platen pressure of 35 pounds per square inch to explore the effect of temperature step-press drying on drying rate and honeycombing. The results of study were same as follows. 1. Press-drying of constant boiling point increased drying times and decreased honeycombing considerably for boards of bath thicknesses. 2. Press-drying of constant plateau temperature reduced drying times but showed severe honeycombing for boards of both thicknesses. 3. Press-drying of temperature step-press drying decreased drying times and honeycombing far 0.25 inch thick boards the same as press-drying of constant lower plateau temperature, but not decreased drying times and honey-combing for 0.50 inch-thick boards.
정희석,이근영,이영준,조유진,이준우,강흥식 대한초음파의학회 2015 ULTRASONOGRAPHY Vol.34 No.3
Purpose: The purpose of this study was to evaluate the long-term efficacy of ultrasound (US)- guided steroid injections in patients with piriformis syndrome. Methods: Between January 2010 and October 2012, 63 patients (23 men and 40 women; average age, 63.2 years; range, 24 to 90 years) were diagnosed with piriformis syndrome based on clinical history, electromyography, and flexion-adduction-internal rotation test results. They were divided into two groups. The first group (37 subjects) received a US-guided steroid injection around the piriformis muscle. The second group (26 subjects) received both piriformis muscle and spinal epidural injections. The therapeutic effect was categorized as improvement, partial improvement, or failure depending on the degree of symptom alleviation one month after injection, based on a review of each patient’s medical records. Results: In the first group, 15 patients (40.5%) showed improvement, seven (18.9%) showed partial improvement, and 15 (40.5%) failed to respond to the initial treatment. In the second group, eight patients (30.8%) showed improvement, 11 (42.3%) showed partial improvement, and seven (26.9%) failed to respond to the initial treatment. A second piriformis injection was performed in four cases, after which two patients showed improvement within 3 years, but the other two showed no therapeutic effect. Conclusion: US-guided steroid injection may be an effective treatment option for patients with piriformis syndrome.
투수시험과 지하수 모니터링을 통한 매립층의 배수불량 원인 분석
정희석,이강일,김준석,Jung, Hee-Suk,Lee, Kang-Il,Kim, Joon-Seok 한국재난정보학회 2018 한국재난정보학회 논문집 Vol.14 No.2
연구목적 : 유적지와 같은 지역은 과거 산으로 둘러 쌓인 구릉지 등에 분포할 경우 강우시 매립층에 분포하는 흙은 투수능력이 떨어져 물이 원활히 배수되지 못하고 표층부의 함수비가 증가하여 지반의 질퍽임 현상이 많이 나타나고 있다. 본 연구는 강우시 배수가 불량하여 유적지에 분포하는 문화재의 기초 뿐만 아니라 상부구조물에도 큰 영향이 예상되어 배수불량의 원인을 파악하고자 하였다. 연구방법 : 현장에서 각종 지반조사 및 현장투수시험 그리고 지하수 모니터링을 통해 그 상관성을 분석하여 매립층의 배수에 대한 불량 원인을 파악하였다. 연구결과 : 본 연구결과 배수불량 원인은 부지내 지하수위가 매우 얕은 심도에 형성되어 있으며, 지표부 및 매립층의 토질은 투수성이 불량한 상태로 강우시 지하로 지표수가 침투되기에는 매우 부적합한 수리지질학적 여건임을 확인할 수 있었다. Purpose: The area such as historic sites where distributed in the hills surrounded by the mountains in the past, if heavy rains occur, soil that distributed in the substructure of a sedimentary layer's permeability decreases therefore, water do not smoothly drainage and increases surface structures' moisture content. Therefore, many phenomena occur such as the muddy ground. This experiment tried to figure out the cause of poor drainage, predicting poor drainage system when rainfall occur. So not only the base of cultural properties distributed in the historic site, but also have big influences on the upper structure. Method: We are going to propose an improvement plan through the various sites exploration and the field permeability test. In addition, analyze interrelationship to figure out the cause of the poor drainage through monitoring under ground water. Conclusion: As the result of the experiment, the cause of the poor drainage system formed on shallow depth of ground level inside of a land. We can see that soil of surface and fill deposit permeability was in poor condition. Therefore, it was in very inappropriate hydrogeological condition when surface water permeate into the underground when rainfall occurs.
테니스 선수들의 서브 강화를 위한 루틴프로그램 개발 및 효과검증
정희석,정성현 한국스포츠학회 2021 한국스포츠학회지 Vol.19 No.2
본 연구는 서브 강화를 위한 선수 개인별 인지적, 행동적 서브루틴프로그램을 개발하고, 개발한 루틴프로그램을 테니스 선수들에게 반복적인 훈련과 연습을 통해 그 효과를 검증하는 데 목적이 있다. 본 연구의 대상자는 서울시에 소재한 H대학교의 테니스 선수 남자 8명, 여자 8명 총 16명 중 실험집단(남4, 여4), 통제집단(남4, 여4)을 대상으로 선정하였다. 루틴프로그램을 개발하기 위해 개발 전 선수들의 루틴을 알아보고자 VCR촬영과 개개인 상담 및 개방형 질문지를 사용하 여 관찰 및 분석을 실시하였다. 서브 루틴 개발에 따라 효과를 검증하기 위하여 집중력 질문지, 자신감 질문지, 인지된 경기력 질문지를 활용하였고 루틴 프로그램 적용에 따른 서브 수행력을 측정하기 위해 실제 서브 성공률을 분석하였다. 그 결과, 루틴프로그램 적용에 따른 집중력, 자신감, 인지된 경기력 검사지를 활용한 결과 실험집단이 집중력 중 주의집중, 자신감요인이, 자신감 중 코치지도력, 신체정신준비요인과 인지된 경기력이 통계적으로 유의한 차이가 있는 것으로 나타 났다. 루틴프로그램 적용에 따른 서브 수행력을 평가한 결과 실험집단은 루틴프로그램 적용 후 첫 서브 성공률이 모두 높게 나타났으나, 통제집단은 첫 서브의 성공률은 비슷하게 측정되거나, 몇몇 선수들은 아주 극소의 확률적으로 첫 서브 성공률이 오른 것으로 나타났다. The purpose of this study is to develop cognitive and behavioral serve routine programs for individual tennis players. The routine program was developed by repeated training and practice for tennis players. The subjects of this study are tennis players of H University in Seoul. a total of 16 athletes (8 men and 8 women) were selected. In order to develop the routine program, VCR photography, individual consultation and open questionnaire were used to observe and analyze the routines of the players before development. After development of the first serve routine, we interviewed the athletes to develop the second serve routine through the modification, supplementation, and modification of the second serve routine, and finally developed the routine. In order to verify the effects of serve routine development, As a result, we used the Concentration, Confidence, and Perceived Performance Questionnaire And the actual serve - success rate was analyzed to measure the serve - performance according to the routine program application. There was statistically significant difference between the experimental group and the experimental group with concentration, confidence, self-confidence, self-confidence, perceived physical strength, and perceived competitiveness according to the routine program. after evaluating the serve-performance according to the application of the routine program, the experimental group showed a higher first serve-success rate after applying the routine program, but the control group showed that the success rate of the first serve- And the first serve success rate has risen.