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전동드릴의 진동전달 특성에 따른 적정 드릴 무게의 결정
이동춘,김길주,Lee, Dong-Choon,Kim, Kil-Joo 대한인간공학회 2000 大韓人間工學會誌 Vol.19 No.2
In this study, the characteristics of transmitted vibration on HAS(hand-arm system) were identified to evaluate physical load due to the work surface orientation, tool weight and push force during powered drilling tasks. The characteristics of transmitted vibration on work surface orientation showed that the acceleration of transmitted vibration on horizontal work surface was higher than that on the vertical work surface. Regarding the characteristics of transmitted vibration on tool weight, the vibration acceleration level becomes lower as the tool weight becomes heavier. The amount of transmitted vibration on hand-arm system was decreased down to the tool weight of 2.4kg. However, as the tool weight becomes heavier than 2.8kg, the amount of transmitted vibration was increased and had peak value at 3.2kg of tool weight. Regarding the characteristics of transmitted vibration on push force, the vibration acceleration level goes higher, as the push force becomes larger. The characteristics of transmitted vibration on the axis of vibration showed that the direction of $Z_h$ had the highest acceleration compared to the direction of $X_h$, and $Y_h$. The direction of $X_h$, $Y_h$ and $Z_h$ had the highest acceleration of transmitted vibration on the hand, wrist and elbow, respectively. The results of this study showed that the condition which affect the lowest physical load to the subject on the powered drilling task would be working with the 2.4kg of tool weight on the vertical work surface.
이동춘(Dong choon Lee),오병균(Byeong kyun Oh),이상범(Sang burm Rhee) 한국정보과학회 1987 정보과학회논문지 Vol.14 No.3
본 논문의 목적은 구조적 프로그래밍이라는 추상적인 개념을 소프트웨어 시스템에 의해서 실제로 적용할 수 있는 체계적인 도구를 개발하는데 있다. 이러한 시스템은 프로그래머가 소프트웨어를 설계하여 작성할 때 stepwise refinement 형태에 의하여 구조적 프로그램을 작성할 수 있게 한다. 이와같이 작성된 프로그램의 특징은 프로그램의 제어 구조와 논리흐름을 이해하기 쉬우며 프로그램을 개정하려고 할 때 전체 프로그램에 영향을 주지 않게 되므로 프로그래밍 상에서 발생하는 에리를 줄일 수 있다. 또한 여러 응용의 복잡한 프로그램을 수정하거나 재구성 할 경우 제안된 시스템을 적용하면 많은 개발비용과 시간을 절감하면서 구조적 코드로 구성된 프로그램으로 변형할 수 있는 큰 장점을 갖고 있다. The purpose of this study is to develop a systematic tool which can reduce the abstractness of the structured programming disciplines by a system. The system is an interactive software which forces the user to think and write software in a hierarchical stepwise refinement fashion for an implementation of the software design. The program produced by the system has a program control structure and a logic flow which are very easy to recognize. The modification of a program is, therefore, easier to attain by altering the specifications of the modules involved. It is possible to reduce the programming errors because of those characteristics.