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조재성(Jae-Sung Jo),김규혁(Gyu-Hyeok Kim) 한국가구학회 1995 한국가구학회지 Vol.6 No.1
This study was conducted in th ε chain of integrated researches which were designed to develop ε substitute material for wood particles in order to solvea shortage of raw materials that our particleboard industry faces. The prime objective of this study was to investigate the feasibility of using old newspapers as a partial substitution of wood particles. Three types of paper-particleboards, having theratios of paper to wood particles of 100 to 0, 70 to 30, and 50 to 50 were produced using commercial urea - formaldehyde resin, and then their properties were evaluated. An improvement of the properties of paper-particleboards eere tried by manufacturing Comply using paper-particleboard as a core material. The results indicated that the manufacture of paper-particleboards was possible in the laboratory scale, and the properties of paper-particleboards were degraded as the amount of paper particles substituted increased. Results also showed that paper-particleboards which comes up to the requirements of the type 150 particleboard specified by Korean Standard could be produced when up to 30 Percent of paper paticles was substituted with wood particles, even though the properties of paper-particleboards were inferior to those of wood particle board. Therefore, it could be concluded that this type of paper-particleboards might be used as furniture parts which are not required to carry heavy loads. Overlaying thin veneers on th ε surfaces of paper-particleboard improved the properties of paper- particleboards considerably, even beyond the properties of wood particleboards.
벼 재배기간중 논 토양에 처리한 54Mn , 60Co , 85Sr , 137Cs 의 용탈
최용호,조재성,이창우,정규회,이정호 ( Yong Ho Choi,Jae Sung Jo,Chang Woo Lee,Kyu Hoi Chung,Jeong Ho Lee ) 한국환경농학회 1996 한국환경농학회지 Vol.15 No.2
Leaching of ^(54)Mn, ^(60)Co, ^(85)Sr and ^(137)Cs in paddy soil was studied using lysimeter cultures in a greenhouse. The radionuclides were applied to the water surfaces shortly before transplanting and five different times between transplanting and harvest. Fertilizer KCl and slaked lime were added simultaneously in the rate of 83kg and 200kg, respectively, per l0a following the first application after transplanting. Percolating water was sampled until two days before harvest. Concentrations of the radionuclides in percolating water decreased in the order of ^(85)Sr > ^(54)Mn > ^(60)Co > ^(137)Cs on the whole. Time taken to reach the maximum was the shortest for ^(137)Cs(< one week) and the longest for ^(54)Mn and ^(85)Sr. Six days` water dropping started 47 days after transplanting reduced the concentrations of ^(54)Mn, ^(60)Co, ^(85)Sr and ^(137)Cs by factors of 30-180, 3-75, 2-4 and 3-6, respectively, depending on the application time. After the significant decrease, ^(54)Mn concentration tended to gradually increase but ^(137)Cs did to the contrary Percent leaching varied 0.09-6.2% for ^(54)Mn, 0.009-0.9% for ^(60)Co, 1.4-14.4% for ^(85)Sr and 0.002-0.06% for ^(137)Cs, with the application time. The highest leaching came from the application at 40 days after transplanting for all the radionuclides. The addition of KCl and lime increased percent leaching of the radionuclides by factors of 9, 85, 4 and 9, respectively.
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.