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광릉긴나무좀(Coleoptera: Platypodidae)의 수간내 분포와 참나무 피해
최원일,이정수,최광식,김종국,신상철,Choi, Won-Il,Lee, Jung-Su,Choi, Kwang-Sik,Kim, Jong-Kuk,Shin, Sang-Chul 한국응용곤충학회 2008 한국응용곤충학회지 Vol.47 No.2
참나무시들음병의 매개충인 광릉긴나무좀, Platypus koryoensis(Murayama)은 한국에서 참나무시들음병원균인 Raffaelea sp.를 매개하는 것으로 알려져 있다. 참나무시들음 발병정도는 광릉긴나무좀의 밀도에 의존적인 것으로 추정되고 있다. 이에 (樹幹)내 천공수와 집중도가 참나무 피해정도에 미치는 영향을 구명하기 위하여 본 연구를 수행하였다. 수락산 피해지에서 고사목 6그루와 피해목 28그루의 신갈나무의 피해정도, 단위면적당 천공수, 천공간 최근거리를 수간의 상부(지표로부터 50cm)와 하부(지표면)에서 조사하였다. 상부와 하부에서의 천공수는 양의 상관을 보였으며 천공간 최근거리 또한 같은 경향을 보였다. 천공수가 증가할수록 수목의 피해도가 심하였으나 수목의 피해도가 심할수록 천공간 최근거리는 감소하였다. 천공의 분포도 수목의 피해도가 증가할수록 집중분포에서 군일분포로 바뀌었다. 광릉긴나무좀이 초기에는 집중적으로 공격을 하나 수간내 밀도가 증가함에 따라 종내경쟁이 일어나고 경쟁의 결과 개체간 간섭현상이 유도되고 천공의 공간적 분포가 균일하게 변환하게 된다는 것을 암시하는 것이다. Ambrosia beetle, Platypus koryoensis, is a vector of oak wilt disease caused by Raffaelea sp. in Korea. The degree of damage by oak wilt disease was dependent on the density of the beetles in the oak trunk, a relationship between the degree of damage by oak wilt disease and the density of beetle on the basis of the number of entry hole was studied. Entry hole distribution within tree trunk was analyzed by the nearest neighbor method. Thirty four oak trees (Quercus mongolica) located in survey area were selected and then degree of damage, the number of attack hole/$623cm^2$ in upper (50cm from the surface) and lower (surface) trunk and the nearest neighbor distance between the holes were measured. The number of hole and the nearest neighbor distance in upper and lower part were positively correlated with each other. As the degree of damage was severer, the number of the holes increased, whereas the nearest neighbor distance decreased. The distribution pattern of the hole was changed from clumped one to uniform as the severity of damage increased. These results suggested that Platypus koryoensis attacked the oak tree in concentrative manner at initial stage of attack but at final stage, it distributed uniformly to reduce intraspecific competition between the beetles.
최원일(Won Il Choi),박기혁(Ki Hyuk Park),김현호(Hyun Ho Kim),김증호(Jeoung Ho Kim) 대한인간공학회 2009 대한인간공학회 학술대회논문집 Vol.2009 No.11
This study was aimed to analyze for characteristics of Musculoskeletal disorders (MSDs) based on the industrial accident statistics. In this study MSDs cases of Food-Accommodation Industry in 2008, 352cases, were investigated. First of all, for the analysis of a wide view point concerning the characteristics of MSDs, We have inspected characteristics of the user population (i.e. age, gender, employed periods, etc.). Secondly, work-related risk factors such as repetitive motions, awkward postures were analyzed in terms of disease code, injured part of body, etc. Next, characteristics of handling of heavy materials were analyzed according to weight, agency of cause, etc. Finally, we have compared and analyzed the features between the period of hospitalization and other variables. In addition to that we also conducted statistics analysis. The study results showed that there were significant characteristics of MSDs that could be used as basis data for the MSDs prevention policy.
신제품개발과정과 신제품성과의 관계 : 산업특성, 기업규모의 조절효과
최원일(Choi Won Il),김창대(Kim Chang-Dae) 한국경영교육학회 2003 경영교육연구 Vol.32 No.-
지속적인 신제품의 개발은 경쟁환경에서 기업이 살아가기 위한 필수적인 요소이며, 신제품의 성공은 신제품개발과정을 얼마나 효율적으로 수행하느냐에 많은 영향을 받는다. 신제품개발과 관련된 많은 선행연구들은 어떠한 활동이 신제품성과에 영향을 미치는지에 대해 주로 다루고 있으나, 대부분 기업이 처하고 있는 산업특성이나 기업규모를 고려하지 않고 있다. 따라서 본 연구는 신제품개발과정과 신제품성과의 관계와 이들의 관계에 산업특성과 기업규모가 어떠한 영향을 미치는지를 다루고 있다. 연구결과를 요약하면 다음과 같다. 첫째, 비첨단산업에서는 모든 신제품개발과정을 제대로 수행하는 것이 신제품성과에 중요한 것으로 나타났지만 첨단산업에서는 그렇지 않았다. 둘째, 중소기업에게는 사전개발활동이 중요한 반면에 대기업에게는 제조관련활동이 중요한 것으로 나타났다. A continuous development of new products is the lifeblood for firms that hope to remain competitive in competitive circumstances. Ongoing success in such circumstances is dependent on performing new product development processes. Most previous studies of new product development process have examined which activity has influence to new product performance. But these studies focus exclusively on firms in a specific industry and did not consider firm's size. So this study examined the relationships between new product development and new product performance and the moderating role of industry characteristics and firm's size. The major findings of this study are summarized as follows; First, performing every new product development activities is important to new product success in non-high tech industry, but it is not appear to be of any significance in the high tech industry. Second, performing pre-development activities is important to small to medium sized firm, and performing manufacturing activities is important to large sized firm.