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최원일(Choi Won Il),조국환(Cho Kook Hwan),박성욱(Park Sung Wook) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
D&B method in tunnel construction requires accurate and rapid measurement of the ground movement, which of essential for feedback analysis. Recently, survey technique adapting IT is getting more and more emphasized in the field of construction and tunnel survey also follow the same trend. Case study and adaptability of IT technique for tunnel survey will be discussed in this study. The application of laserscannig method in the field of tunnel construction was reported in several advanced country including Austria and Japan. Survey for the crown and shoulder movements by IT survey method was conducted and the results were compared to those do the conventional method. The pipe-roof, grouting, ring-cut are installed in the this site to prevent expected large ground settlement. The result show that laserscanner system is prefered rather than conventional method in that better understanding for the displacement condition and origin condition was liable by the lasersacnnig method. IT survey solution makes if possible to execute more economic and safe construction.
A Study on the Community of Xylophagous Beetles in Korean White Pine, Pinus koraiensis, Forests
최원일,김경민,고상현,남영우,Choi, Won IL,Kim, Kyung-Min,Koh, Sang-Hyun,Nam, Youngwoo Korean Society of Applied Entomology 2017 한국응용곤충학회지 Vol.56 No.1
2007년에 잣나무림에서 하늘소과, 바구미과, 나무좀아과에 속하는 천공성 딱정벌레 군집을 말레이즈 트랩을 활용하여 조사하였다. 하늘소류 15종 184 개체, 바구미류 17종 185개체, 6종 1,246개체의 총 1,615개체 천공성 딱정벌레가 채집되었고 우점종은 왕녹나무좀이었다. 개체수에 따라 순위를 매겼을 때, 잣나무림에서 천공성 해충과 나무좀류 군집은 나무좀아과의 한 종에 의해 우점되어 생물다양성이 낮은 것으로 나타났다. 잣나무림에서 간벌은 나무좀과 암브로시아좀류의 풍부도에 영향을 미쳐 특정 임분에서의 개체군들은 간벌 1년 후 밀도가 증가했으나 그 후 감소하였다. The community of xylophagous beetles belonging to Cerambycidae, Curculionidae and Scolytinae in Korean white pine, Pinus koraiensis Siebold & Zuccarini, forests was surveyed using Malaise traps in 2007. A total of 1,615 xylophagous beetles were collected, including 184 cerambycids from 15 species, 185 curculionids from 17 species, and 1,246 scolytid beetles from 6 species, of which the dominant species was the ambrosia beetle Xyleborus mutilatus Blandford. Ranked by order of population size, the wood-boring and bark beetle community in Korean white pine showed high dominance by one species of Scolytinae, suggesting the community had low biological diversity. Thinning in Korean white pine forests influenced on the abundance of bark and ambrosia beetles, whose populations in particular stands increased 1 year after thinning, and then decreased the following year.
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.
플루로닉(pluronic) 기반의 나노운반체(nano-carrier)에 충진된 카이모파파인(chymopapain)의 척추 추간판 조직내 작용성에 관한 연구
최원일(Choi, Won Il),태기융(Tae, Gi Yoong),홍영기(Hong, Young Ki) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.1
이 연구의 목적은 척추 추간판 융해제인 카이모파파인을 나노캐리어 시스템에 충진시켜 주입시, 추간판내 약제의 확산범위가 감소하는지 평가하기 위한 것이다. 총 3주간 시행된 실험의 재료로는 두 개의 카데바에서 채취된 열다섯 개의 척추 추간판이 쓰였고, 이들은 주입되는 카이모파파인의 종류에 따라 일반 카이모파파인 그룹과 나노캐리어 시스템 그룹으로 나뉘었다. 나노캐리어 시스템 그룹은 다시 그 기반재료가 되는 플루로닉의 종류에 따라 플루로닉 F 127(DA-PF 127) 나노 캐리어 그룹과 플루로닉 F 68(DA-PF 68) 나노캐리어 그룹으로 나뉘었다. 실험결과 나노캐리어 시스템을 사용한 그룹은 일반 카이모파파인 그룹에 비해, 척추 추간판 내부로 주입되었을 때, 주입지점에서 멀리 확산되지 않고 국소적으로 작용하는 특성을 보였다(p<0.01). 이러한 특성은 향후 추간판 내 병소만을 선택적으로 제거하는 최소침습적 척추시술의 기반약제로 응용될 가능성을 제시해준다 The objective of this study is to determine if when chymopapain is loaded onto a nano-carrier, an injection of it reduces the spreading range of the drug within the discs. The materials for the experiment, which were conducted for three weeks, included fifteen intervertebral discs taken from two cadavers, which were divided according to the types of injected chymopapain solutions as follows: ordinary chymopapain group and nano-carrier system group. The nano-carrier system group was again divided into two subgroups according to the types of pluronics, the basic material for the nano-carriers: Pluronic F 127(DA-PF 127) in the nano-carrier group and Pluronic F 68(DA-PF 68) in the nano-carrier group. The results showed that the action of chymopapain using a pluronic-based nano-carrier system was localized around the center of the injection site instead of broad spreading, compared to that of the ordinary chymopapain group (p<0.01). This characteristic suggests a possible application to effective agents for minimally invasive spinal treatment through which disc lesions were removed selectively.
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.