• Proceedings of the Korea Concrete Institute Conference
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• 1995.04a
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• pp.183-188
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• 1995

Up to date, high-strength concrete pile which is producing in factory sells in the market. But according to the site and the construction conditions, the system to produce high-strength concrete pile directly in site is utilized in advanced country. Such the production system is the technique phenomenon very disirable in the side of quality control in site and the construction schedule, the time and the cost saving. This study is a fundamental experiment including concrete mixing design, non-autoclave curing method and the optimum condition to produce high-strengh concrete pile in site. As results of this study, High-strength concrete pile in site which target strength is 400kg/ $\textrm{cm}^2$ is able to produce it with optimum curing ciondition(75$^{\circ}C$, 9hr)and mixing design.

• Journal of the Korean Operations Research and Management Science Society
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• v.21 no.1
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• pp.81-100
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• 1996

본 연구에서는 보다 효과적인 기업신용평가를 위하여, 통계적 방법과 인공지능 방법을 결합한 결합모형을 제시햐고자 한다. 이를 위하여 본 연ㄴ구에서는 통계적인 모형중에서 가장 널리 활용되고 있는 MDA (Multivariate Discriminant Analysis) 와 인공지능적인 방법으로서 최근에 널리 사용되고 있는 인공싱경망( neural network)모형을 휴리스틱한 방법으로 결합한다. 이러한 결합모형의 성과를 증명하기 위하여 우리나라의 대표적인 3대 기업신용평가 기관에서 수집한 1043개의 기업신용평가자료를 기초로 실혐을 하고, 그 결과를 기존의 MDA 및 인공신경망 방법에 의한 결과와 비교하였다. 실험결과, 통계적으로도 유의하고, 실무적인 관점에서도 의미가 있는 기업신용펑가 결과를 유도할 수 있었다.

• Knowledge Management Research
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• v.10 no.2
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• pp.35-48
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• 2009

The paper proposes a quantitative causal ordering map (QCOM) to combine qualitative and quantitative methods in a framework. The procedures for developing QCOM consist of three phases. The first phase is to collect partially known causal dependencies from experts and to convert them into relations and causal nodes of a model graph. The second phase is to find the global causal structure by tracing causality among relation and causal nodes and to represent it in causal ordering graph with signed coefficient. Causal ordering graph is converted into QCOM by assigning regression coefficient estimated from path analysis in the third phase. Experiments with the prediction model of Korea stock price show results as following; First, the QCOM can support the design of qualitative and quantitative model by finding the global causal structure from partially known causal dependencies. Second, the QCOM can be used as an integration tool of qualitative and quantitative model to offerhigher explanatory capability and quantitative measurability. The QCOM with static and dynamic analysis is applied to investigate the changes in factors involved in the model at present as well discrete times in the future.

• Journal of Institute of Control, Robotics and Systems
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• v.11 no.11
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• pp.943-949
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• 2005

For the psychophysical experiment of tactile perception of shapes, experimental system consists of vibrator, tactile stimulation array, measurement and control system is designed and prepared. The psychophysical experiment for the tactile perception of shape is carried out by the estimation of the subject group. Through the experiment the threshold of tactile perception to multi-stimuli with some line shape is obtained. Also the appropriate tactile stimulus intensity and frequency of the tactile stimulation array to recognize arbitrary shapes effectively are derived and discussed.

• Journal of Institute of Control, Robotics and Systems
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• v.11 no.11
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• pp.950-955
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• 2005

A automatic component inserting system for industrial PCB is developed in this paper. This system has not been developed in Korea. Most domestic companies produce PCB manually. This process requires highly-skilled staff. Therefor, we developed a PCB inserting system for automation of the process and improved productivity. There are low parts in this system; press, table, tool change and control part. A hybrid press cylinder with pneumatic and hydraulic is used in the press part. The table part consists of pneumatic actuators, stepping motors and ball-screw mechanism. In the tool change part, upper tools can be exchanged automatically for the inserting of various components. The control part consists of motor drivers, PLCs and power supply.

• Transactions of the Korean Society of Mechanical Engineers
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• v.13 no.6
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• pp.1223-1230
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• 1989

본 연구에서는 이러한 관점으로부터, 개방식 연촉매치를 상정하여, 백금의 모노리스형 촉매를 이용한 메타놀예%%합형 촉매연소기의 정상운전의 실용성에 관한 실험 및 수치계산을 행하였다. 먼저 촉매연소기의 온도분포 및 배기가스 온도분포를 파악하고, 촉매연소기의 실용성을 평가하기 위하여 실내환경예측을 행하였다. 또한 실험만으로는 연소기의 여러가지 운전조건에 관한 전테이타를 얻는 것은 어렵다. 이 때문에 본 연구에서는, 이전의 연구에서 이용한 계산과 같이 메타놀이 완전연소하는 는 것으로 보고 중간산하물의 생성을 무시한 1차원 수치계산모델로 연소특성, 배기가 스의 배출특성등의 예측을 하였으며, 명종 운전 파라메타의 설정한계 등에 대하여 검토를 행하였다.

• Proceedings of the Korean Society of Crop Science Conference
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• 2006.04a
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• pp.600-601
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• 2006

• Proceedings of the Korean Society of Crop Science Conference
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• 2006.04a
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• pp.602-603
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• 2006

• Proceedings of the Korean Society of Crop Science Conference
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• 2006.04a
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• pp.598-599
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• 2006

• Proceedings of the Korean Society of Crop Science Conference
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• 2006.04a
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• pp.554-555
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• 2006