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타이밍 벨트 마모 개선을 위한 벨트 트래킹 저감 및 풀리 플랜지 형상에 관한 연구
권희도(Kwon, Hee Do),장경익(Jang, Kyoung Ik),홍순재(Hong, Soon Jae),서인재(Seo, In Jae),양경준(Yang, Kyung Joon) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
Pulley Flanges are designed to keep belt within the pulley. When it comes to design pulley flanges, it needs to be considered tracking force – lateral force of the belt as it attempts to move in one direction or another on the pulley. The Tracking force is related to timing belt drive system layout, components of belt drive system and belt constructions. There are various problems caused by the belt tracking force in all engines that use the timing belt system. In the initial development of the new U-engine, there was also a belt side wear problem due to belt tracking force. This paper reports the characteristics of tracking behavior and flange design on a New U 1.6 diesel engine. It shows that how to optimizing the belt tracking and the flange design to reduce timing belt side wear.
권희도(Heedo Kwon),송계웅(Kyeoong Song),이병철(Byungchul Lee),이종원(Jongwon Lee),김형신(Hyungshin Kim) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
The purpose of this paper is chain whine noise improvement on the diesel engine with rubber coated sprocket. Chain whine noise is one of the biggest issues on the engine using the chain as timing drive system. Furthermore, the rubber coated sprocket can meet durability target and can develop better noise behavior by optimizing the nipple shape of rubber coated sprocket. The optimized nipple shape can help the progressive contact when the chain was engaged in the sprocket.
김종섭(Chong-Sup Kim),권희만(Hui-Man Kwon),고기옥(Gi-Ok Koh),한광호(Kwang-Ho Han),이승덕(Seung-Deok Lee),황병문(Byung-Moon Hwang),김성준(Seong-Jun Kim) 한국항공우주학회 2011 韓國航空宇宙學會誌 Vol.39 No.2
현대의 고성능 전투기는 공력성능 및 조종성능의 향상을 위하여 대부분 세로축 방향으로 항공기를 불안정하게 설계하는 정안정성 완화 개념을 채택하고 있다. 항공기는 비행제어법칙에 필요한 피치, 롤, 요우각속도, 수직가속도와 같은 항공기 상태정보를 각속도 (RSA: Rate Sensor Assembly)와 가속도센서(ASA: Acceleration Sensor Assembly)로부터 획득한다. 항공기에 적용되는 센서는 항공기의 안전을 보장하는 최소한의 허용 가능한 측정 오차를 갖지만, 잡음, 오프셋 등과 같은 허용 범위내의 오차로 인하여 원하지 않는 항공기 운동을 발생시킨다. 비행시험 결과, ASA의 허용 범위내의 측정 오차는 1g 수평비행시에 원하지 않는 기수 숙임 현상을 일으켰다. 본 논문에서는 이러한 오차로 인하여 발생하는 기수 숙임 현상을 개선하기 위해 1g 수평비행 조건에 피치자세각 궤환을 세로축 제어법칙에 적용하였다. 비행시험 결과, 피차자세각 궤환은 1g 수평 비행 시에 기수 숙임 현상을 제거하고 항공기의 기본적인 안정성에는 영향을 미치지 않는다는 것을 확인할 수 있었다. The flight control system utilize RSS(Relaxed Static Stability) criteria in both longitudinal axes to achieve performance enhancements and improve stability. The aircraft using digital flight-by-wire flight control system receives aircraft flight conditions such as pitch, roll and yaw rate, normal acceleration from RSA(Rate Sensor Assembly) and ASA(Acceleration Sensor Assembly). These sensors has permissible measurement error related to system safety of an aircraft but, unexpected flight motions are happened by sensing errors such as offset, noise and etc. The unexpected pitch down tendency occurred by ASA sensor bias in 1g level flight with pilot hands-off. This paper addresses the design and verification of flight control law to improve of pitch down or up tendency caused by ASA sensor bias. The result of analysis and flight test reveals that pitch down tendency can be improved by pitch attitude feedback system.
권희(Hee Kwon),정경희(Kyung Hee Jung) 한국언어치료학회 2016 한국언어치료학회 학술발표대회 논문집 Vol.2016 No.12
Purpose: This study purposes to figure out the difference of the ability to resolve homonymic ambiguity among children aged three to five. Methods: The study targets were children aged three to five, and each age group had 10 children, corresponding to a total of 30 children who participated in the study. The study task consisted of four separate pictures in one frame, and one of the pictures had a sentence with the opposite meaning of the homonym. Results: First, the number of children who comprehended homonymic ambiguity was significantly different between three years old and five years old as well as four years old and five years old. The number of children who resolved homonymic ambiguity was also significantly different between three years old and five years old as well as four years old and five years old. However, the number of children who comprehended and resolved homonymic ambiguity was not significantly different between three years old and four years old. Second, the total number of attempts to resolve homonymic ambiguity was significantly different between three years old and five years old as well as four years old and five years old. The success rate of resolving homonymic ambiguity was also significantly different between three years old and five years old as well as four years old and five years old. Third, the colloquial language resolution rate among the homonymic ambiguity resolution types was significantly different between three years old and five years old as well as four years old and five years old. However, the resolution rate that involves the use of both colloquial language and gestures was not different between the groups. Fourth, the use of deictic and iconic gestures, which are gesture types used in the case of resolution through the use of both colloquial language and gestures, was not significantly different between the groups. Although the statistics did not show significant difference, three years old often used deictic gestures, and four years old frequently used deictic and iconic gestures, and five years old used iconic gestures relatively frequently. Conclusions: Based upon the results mentioned above, it appeared that the ability to comprehend and resolve homonymic ambiguity develops in the age of four and five. And the number of attempts by five years old decreased, and their success rate increased.
Characteristics of the Homonymic Ambiguity Resolution in Preschool Children
Hee Kwon(권희),Kyunghee Jung(정경희) 한국언어청각임상학회 2019 Communication Sciences and Disorders Vol.24 No.3
배경 및 목적: 본 연구는 3-5세 아동들을 대상으로 동음이의어 모호성 해결력 차이를 알아보고자 하였다. 방법: 연구대상은 3-5세 아동으로 연령집단 간 10명씩 총 30명으로 정상발달로 보고된 아동이며, 수용어휘력이 정상발달을 보이는 아동이다. 연구의 과제는 동음이의어가 대립된 한 문장을 포함한 4컷의 그림으로 구성하였다. 검사자가 아동에게 그림을 제시하며 이야기를 설명해 주고, 아동이 보조자에게 다시 이야기를 해 주었다. 결과: 동음이의어 모호성 이해수는 3세와 5세, 4세와 5세 집단 간 유의한 차이가 있었다. 동음이의어 모호성 해결 수에서도 3세와 5세 집단, 4세와 5세 집단에 유의미한 차이가 나타났다. 동음이의어 모호성 해결 총 시도수에서 3세와 5세 집단, 4세와 5세 집단 사이에 유의미한 차이가 나타났으며, 동음이의어 모호성 해결성공률에서도 3세와 5세 집단, 4세와 5세 집단에 유의미한 차이가 나타났다. 동음이의어 모호성 해결유형 중 구어해결률에서 3세와 5세 집단, 4세와 5세 집단에 유의미한 차이가 나타났으나, 구어+제스처 해결률에서는 유의미한 차이가 나타나지 않았다. 구어+제스처 해결 시 사용한 제스처 유형 중 지시적·도상적 제스처 두 유형 모두 집단 간 유의미한 차이가 나타나지 않았다. 논의 및 결론: 위의 결과로 보아, 동음이의어 모호성 이해와 해결에 4-5세에 발달하는 것임을 알 수 있었다. 동음이의어 모호성 총 시도수와 해결성공률의 측면에서는 연령이 늘어남에 따라 시도수는 줄어들고, 해결성공률이 높아짐을 알 수 있었다. Objectives: This study purposed to examine differences in ability to resolve homonymic ambiguity among children aged 3 to 5. Methods: A total of 30 typically developing preschool children aged 3 to 5 participated in this study, and each age group had 10 children. Results: The study results are summarized as follows: first, the number of children who comprehended homonymic ambiguity was significantly different between 3- and 5-year-old children, as well as between 4- and 5-year-old children. Second, the total number of attempts to resolve homonymic ambiguity was significantly different between 3 and 5 years old as well as between 4 and 5 years old. The success rate of resolving homonymic ambiguity was also significantly different between 3 and 5 years old as well as between 4 and 5 years old. Third, the colloquial language resolution rate among the homonymic ambiguity resolution types was significantly different between 3- and 5-year-old children as well as between 4- and 5-year-old children. However, the resolution rate that involved the use of both colloquial language and gestures was not different between the groups. Fourth, the use of deictic and iconic gestures, which are gesture types used in the case of resolution through the use of both colloquial language and gestures, was not significantly different between the groups. Although the statistics did not show significant difference, 3 years old often used deictic gestures, and 4 years old frequently used deictic and iconic gestures, and 5 years old used iconic gestures relatively frequently. Conclusion: Based upon the results mentioned above, it appeared that the ability to comprehend and resolve homonymic ambiguity develops at the age of 4 and 5. And the number of attempts by 5 years old decreased, and their success rate increased.
감염성 경골 불유합에 시행한 혈관 부착 유리 피부편 및 생비골 이식 수술의 임상적 고찰
송준민,김진일,권희,유재응,박종석,나수균,최창욱,Song, Joon-Min,Kim, Jin-Ill,Kwon, Hee,Yoo, Jae-Eung,Park, Jong-Suk,Rah, Soo-Kyoon,Choi, Chang-Uk 대한미세수술학회 2000 Archives of reconstructive microsurgery Vol.9 No.1
February 1995 to September 1999, authors have experienced seven cases of infected nonunion of tibial fractures with associated soft tissue injury and skin defect, and have accomplished union in all cases by free vascularized fibular graft. All grafts healed with no radiographic evidence of bone necrosis or resorption and have been able to treat large bony defect and skin defect simultaneously. In this study, five cases of vascularized free fibular osteocutaneous flap transfer and two cases of free fibular graft are reported. All of seven cases were infected nonunion of tibia. The results were obtained as follows 1) The mean duration of the radiologic bone union was average 5.3months. 2) Grafted fibular has been hypertrophied, average 10.6 months. 3) In five cases of preservation of posterior cortex of tibia, bony union and hypertrophy of grafted bone were earlier than that two cases of complete segmental resection of tibia. 4) In two cases which only free vascularized fibular graft were performed because achievement of cutaneous flap was failed, authors found that soft tissue defect was filled with granulation tissue and split-thickness skin graft was possible over the granulation tissue after 3 weeks postoperatively.