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오늘 본 자료
Neanurid collembola 침샘의 형태 및 세포학적 비교
이병훈 한국유전학회 1985 Genes & Genomics Vol.7 No.4
Salivary glands from eleven species of Neanuridae (Collembola) varied in morphology with distinct generic differences. Plotting a range diagram of the numbers and sizes of the cell nuclei revealed four separate groups, possibly suggesting three strategies controlling salivary gland growth, 1) cellular multiplication, 2) cell volume increase, or 3) a combination of the two. Cellular multiplication may assure accentuated salivary function in some advanced form like Crossodonthina spp. in the present study as a potential alternative to ontogenetic lateral DNA increase observed in dipteran groups and most Neanurid Collembola with giant chromosomes.
페루프를 포함하는 다물체계에 있어서 구동방법에 따른 구동력 및 조인트 반력 해석
이병훈,최동환,Lee, Byeong-Hun,Choe, Dong-Hwan 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.6
Analysis of actuating forces and joint reaction forces are essential to determine the capacity of actuators, to control the system and to design the components. This paper presents an algorithm tha t calculates actuating forces(or torques) depending on the various driving types to produce a given system motion. The joint reaction forces(or torques) of multibody systems with closed-loops are analyzed in the Cartesian coordinate space using the inverse velocity transformation technique. Two numerical examples were carried out to verify the algorithm proposed.
A Causal Analysis of Youth Inactiveness in the Korean Labor Market
이병훈,김종성 한국학중앙연구원 한국학중앙연구원 2012 Korea Journal Vol.52 No.4
Youth inactiveness has become a focal issue of public concern in South Korea. This study examines both macro- and micro-level factors that produce the growing trends of inactive youth and the problem of youth joblessness. At the macro-level, the dimension of labor demand is the most crucial factor in creating youth inactiveness, although the problem is also derived from the oversupply of overeducated youths as well as insufficient labor market policy and infrastructure. At the micro-level, our analysis addresses three remarkable points. First, under the gendered context of the Korean youth labor market, female youths, who are disadvantaged in the job opportunity structure, are found to attend job training programs for enhancing the condition of their labor market transition and the quality of their future jobs, rather than directly moving into the labor market through active job search. Second, high education for the purpose of further developing their employability leads jobless youths to become inactive, rather than becoming active job seekers. Finally, such household characteristics as family income and father’s socioeconomic status are reaffirmed to be significant factors influencing youth inactiveness.