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안영찬(Ahn, Young-Chan),이해진(Lee, Hae-Jin),박상길(Park, Sang-Gil),이유엽(Lee, You-Yub),오재응(Oh, Jae-Eung) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.10
This paper considers acoustic characteristics of silencer within a dry vacuum pump. The main objective is to reduce noise in dry vacuum pump using the new designed silencer. First, SPL and sound intensity are measured for noise source identification and the new model silencer is designed corresponding to noise characteristics. 4-pole parameters are used to predict the transmission loss which is one of the interest characteristics of the new silencer. The calculated transmission loss is then used to change main effective factor and optimal value is selected by using design of experiment. By conducting an experiment, it is proved that the new designed silencer has reduced noise level by 6 dB(A) more than the original one.
2007·2009 개정 교육과정 중학교 역사(상)의 삼국시대 문화사 분석
吳永贊(Oh,Young-Chan) 歷史敎育硏究會 2011 역사교육 Vol.119 No.-
This article analyses the cultural history of Korean Three Kingdoms narrated by the history textbooks of the middle school, which have passed the certification by 2007(09) revised curriculum. The 2007(09) revised curriculum integrates the divided subjects of Korean History and World History- in middle school and highschool history by the 7th national curriculum- into 'History.' The contents of the 2007 certified textbooks are examined, focusing on three aspects, which are: the cultivation of the history researching and thinking skills, the connection of the Korea and the world, and the offered plentiful visual reference; this is attempt to connect the research works of the academia of ancient Korean history. In the description of textbooks, there are some fragments of facts and informations on the tombs and the buddhist art of the three kingdoms, such as inaccurate understandings and insufficient description on the historic context. Certain perspectives taken upon by the textbook authors; in order to emphasize the international mind set and openness, weight is given to what extent the Three Kingdoms influenced Japan in the matters of external cultural exchange and had direct exchange with the west asia. In addition, the exchange between Korea and China at that time is purposefully unmentioned. Last, the certified textbooks present plenty of visual references, but there are some inexact images and captions. There still remains the need to make the informations more precise.
네트워크 분석과정을 이용한 환경물류의 의사결정 요인에 대한 연구
이영찬(Young-Chan Lee),오형진(Hyung-Jin Oh) 한국경영과학회 2010 經營 科學 Vol.27 No.1
According to appearance of a new competitive factor, as ‘Green’, Green Logistics becomes the important evaluation factor for many firms in emerging competitive environment. Despite this importance, the recognition level of Korean firms on Green Logistics lags behind that of leading companies in developed countries. In addition, the literature studies and practical strategies for systematic management control plans are very insufficient. In this paper, we establish decision making framework of Green Logistics by using ANP(analytic network process). Specifically, we suggest at first the overall concepts and issues of Green Logistics through literature studies. Next, we derive 6 clusters and 21 components forming the strategic green logistics, and then we conduct surveys for pairwise comparison of experts on Green Logistics and compute relative weights of the clusters, components and altanatives considering the feedback structure. We expect that the results of this study will be very helpful for managers to make strategic decisions.
친환경 공급사슬관리의 영향요인, 실행수준, 그리고 기업성과간의 구조적 인과관계
이영찬 ( Young Chan Lee ),오형진 ( Hyung Jin Oh ) 한국정보시스템학회 2012 情報시스템硏究 Vol.21 No.1
In this paper, we arrange the concept of ``Green`` in SCM after literature study of Green SCM and investigate causal relationships between influencing factors, practice level and environmental performance focused on Korean firms empirically and conduct path analysis for hypothesis test using partial least squares regression with bootstrap. Firstly, we divide influencing factors of Green SCM into environmental and organizational factors through the previous studies of innovation diffusion theory and environmental management theory, and then we selected ``uncertainty``, ``competitiveness`` as the environmental factors and ``top management support``, ``perceived benefit``, ``training`` as the organizational factors. Secondly, we classify practice level of Green SCM into ``internal environmental management``, ``green purchasing``, ``eco-design``. Finally, we selected ``financial performance``, ``environmental performance`` as the organizational performance. We conducted a survey on the middle manager of manufacturing companies implementing SCM and an empirical analysis. The results of analysis show that there exist causal relationships between influencing factors, practice level, and environmental performance of Green SCM. We expect that the result of this study will suggest useful information to managers who are responsible for SCM to design and execute Green SCM in strategic perspectives.
유영찬(Yeong Chan Yoo),안형준(Hyung Joon Aan),최창식(Chang Sik Choi),오영석(Young Suk Oh),이리형(Li Hyung Lee),문태섭(Tae Sup Moon) 한국강구조학회 1993 韓國鋼構造學會誌 Vol.5 No.2
A preflex beam is a type of concrete encased steel beam of which prestressing has been introduced in the lower flange concrete. To build up preflex beam, preflexion load are first applied to the steel beam, and secondly, while keeping the steel beam bent, the lower flange concrete is cast. Then, releasing the applied loads after the concrete hardened, the prestress is introduced into the concrete. This preflex beam has merits such as large flexural stiffness with smaller beam depth and low maintenance costs. Recently, in this merits, it has been demanded to apply the preflex beam to building structure of large span such as bowling center and gymnasium. In this paper, the strength and deformation characteristics of preflex beam are discussed through positive and negative bending experiments of preflex beam as a strength test.