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최경웅(Gyong-Yung Choi),조재성(Jae-Sung Jo),박병건(Bung-Gun Park),박순철(Soon-Cheol Park) 한국정보과학회 1997 한국정보과학회 학술발표논문집 Vol.24 No.2Ⅲ
컴퓨터를 교육의 매체로 활용하려는 연구는 멀티미디어 컴퓨터의 보급 및 정보 통신망 기술의 발달로 많은 발전을 이루었다. 특히 멀티미디어 기술과 GUI와 같은 사용자 인터페이스 기술의 발전으로 멀티미디어 프로그램 및 컴퓨터 코스웨어(CourseWears)를 위한 많은 교육용 소프트웨어가 개발되고 있다. 또한 인터넷의 발전은 전세계의 모든 정보들을 빠르게 검색하고 공유할 수 있고, 인터넷 가입자와 메일을 주고 받으며 원하는 작업을 수행시킬 수 있다. 본 시스템의 목적은 네트워크에 연결된 컴퓨터를 이용하여 플랫폼에 독립적이고, 객체지향적이며, 분산환경에서 실시간으로 데이터를 처리할 수 있는 CORBA를 이용하여 웹 상에서 일대 다수의 클라이언트-서버 관계인 화이트 보드를 설계한다.
신발 착용 유무에 따른 20대 성인의 동적 균형 및 다리의 근활성도 변화 비교
안수홍,이수경,양주희,조재성,박진성,Ahn, Su-Hong,Lee, Su-Kyong,Yang, Ju-Hui,Jo, Jae-Sung,Park, Jin-Sung 대한고유수용성신경근촉진법학회 2021 PNF and Movement Vol.19 No.2
Purpose: The purpose of this study was to investigate the difference in the dynamic balance and leg muscle activity of adults in their 20s with or without shoes. Methods: In this study, seven male and 11 female university students in their 20s were randomized to determine the order of being with or without shoes, and the dominant foot was supported on the central platform of dynamic balance according to the order procedure. Using the opposite foot, the distance of leg stretching in the anterior, posterior medial, and posterior lateral directions and the muscle activity of the supporting leg were measured. Muscle activity measurement sites were attached to the dominant vastus medialis oblique muscle, vastus lateral oblique muscle, tibialis anterior muscle, peroneus longus muscle, and lateral gastrocnemius muscle. Results: As a result of this study, the distance of leg stretching was significantly increased in the anterior, posterior medial, and posterior lateral directions when barefoot rather than when wearing shoes (p < 0.05). The muscle activity of the vastus medial and lateral oblique muscles was significantly increased in all three directions when barefoot rather than when wearing shoes (p < 0.05). The muscle activity of the tibialis anterior was significantly increased in the anterior direction when barefoot (p < 0.05), the peroneus longus muscle was significantly increased when it was barefoot in the posterior medial direction (p < 0.05), and the lateral gastrocnemius muscle activity significantly increased when barefoot in the posterior direction (p < 0.05). Conclusion: The movement of the legs is freed when barefoot as compared to when wearing shoes, and being barefoot can effectively activate muscle activity and improve balance ability.
최장한(Jang Han Choi),박상민(Sang Min Park),박준홍(Joon Hong Park),조재성(Jae Sung Jo) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Test development process of race car is depend on race driver’s experience in usual. Race car performance is focused on lap time in race track. Now We introduce development process of race car especially in suspension. Using vehicle simulation model which is made by K&C measurement device and AI(Artificial Intelligent) Driver model can develop performance of race car in lap.
응력파 측정에 의한 수종의 국산 침엽수재 및 열대 활엽수재의 휨성질 평가
김규혁,조재성,이도식 한국목재공학회 1997 목재공학 Vol.25 No.1
Stress wave velocity, wave impedance. and stress wave elasticity of small, clear bending specimens of five domestic softwoods(Pinus densiflora, Pinus koraiensis, Chamaecyparis obtusa, Cryptomeria japonica, and Larix leptolepis) and four tropical hardwoods(Kempas, Malas, Taun, and Terminalia) were correlated with static bending modules of elasticity(MOE) and modules of rupture(MOR). The degree of correlation between stress wave parameters and static bending properties was dependent on wood species tested. Stress wave elasticity and wave impedance were better predictors for static bending properties than stress wave velocity for each species individually and for softwood or hardwood species taken as a group, even though elasticity and impedance were nearly equally correlated with static bending properties apparently. Based upon the correlation coefficient between stress wave parameters and static properties, stress wave elasticity and wave impedance were found as stress wave parameters which can be used for the purpose of the reliable and successful prediction of bending properties. The degree of correlation between static MOE and MOR was also different according to wood species tested. Static MOE was nearly as well correlated with MOR as was stress wave elasticity. The results of this research are encouraging and can be considered as a basis for further work using full-size lumber. From the results of this study, it was concluded that stress wave measurements would provide useful predictions of static bending properties and was a feasible method for machine stress grading of domestic softwoods and tropical hardwoods tested in this study.
내화처리 및 재건조라 라디에타소나무의 역학적 성질에 미치는 영향
김재진,정두진,김규혁,조재성,윤기언 한국목재공학회 1999 목재공학 Vol.27 No.1
The effect of fire-retardant treatment and redrying on the mechanical properties of radiata pine sapwood were evaluated. Small, clear specimens were treated with three different fire-retardant(FR) chemicals, borax-boric acid(BRX), minalith(MIN), and pyresote(PYR), with target retentions of 30 and 60㎏/㎥, and then redried at maximum dry-bulb temperature of 25℃, 60℃, 80℃ or 110℃. Each specimen, including untreated and water-treated controls, was tested in static bending and in compression parallel to grain. The extent of strength reduction was dependent on the type of FR chemicals, retention, and redrying temperature, and a highly significant interaction existed between FR treatment and redrying temperature. Modulus of rupture(MOR) and work to maximum load(WML) were significantly decreased by FR treatment and redrying. None of three FR chemicals adversely affect modulus of elasticity (MOE) and maximum crushing strength(MCS). MOE of BRX treatment and MCS of both BRX and PYR treatment increased significantly compared to untreated controls. No significant differences existed between retention levels except for MOE and MCS of some combinations of FR chemicals and redrying temperatures. Although MOE and MCS was not significantly affected by any of the redrying temperatures, these properties were generally decreased with the increase in redrying temperature. The significant reduction in MOR and WML was observed in BRX treatment when dried at temperatures of 60℃ and above, and in MIN and PYR treatment when dried at temperatures of 80℃ and above. Consequently, BRX-treated radiata pine should not be redried at temperatures $gt;60℃, and MIN- and PYR-treated radiata pine should not be redried at temperatures $gt; 80℃ where bending strength and energy-related properties are important design considerations.