전자공업은 방위산업발달에 획기적인 역할을 담당하고 있으며, 특히 전략적 $C^{3}$/I( Command, Control, Communication, and Intelligence) 개념을 도입하여, 국가방위를 위한연구가 미국의 여러 대학들과 방위성 산하 연구기관에서 활발히 진행되고 있다. 이 글에서는 $C^{3}$/I에 대한 개략적인 개념을 소개하고, 추계학적(Stochastic) 관점에서 $C^{3}$/I가 실전을 위해 어떻게 응용되고 있는가를 고찰하기 위하여 최근에 발표되고 있는 비 선형필터링(Nonlinear Filtering), 적응필터링(Adaptive Filtering) 최적제어 문제들을 소개하고자 한다.

Servo 기구의 특성을 해석하고, 또는 원하는 특성을 갖도록 설계하려면 먼저 Servo 기구를 수학적으로 취급하는 방법을 체득하여야 한다. 여기에 사용되는 수법으로 전달함수(transfer function)와 block 선도가 있다. 전달함수는 servo 기구를 구성하는 요소(모우터와 증폭기등)에 대해서 그 입력과 출력 과의 관계를 나타내는 것이며 block 선도는 servo 기구의 구성요소에 의한 시스템적인 구성과 각 부 신호간의 관계를 표시한 것이다.

우리들은 현재 3차산업혁명이라고 하는 정보화시대에 생활하고 있으며, 급격한 과학의 진보는 사회에 큰 영향을 미쳐, 커다란 혁명을 초래하여 왔다. 이로써 인간이란\ulcorner 생체란\ulcorner 생명이란\ulcorner 무엇인가에 대해 반문하게 되는 기회가 많아지게 되었고 이에 따라 생물물리, 생물화학, 생체공학, 의료공학의 연구에 더 많은 관심을 갖게 되었다. 또한 사회의 부유화, 국민의 건강의식의 증대, 복지지향사회의 심화를 배경 으로 의료는 질적으로도 양적으로도 고도화되어 가고 있다. 이에 고도화하고 광범한 공학기술이 발전하게 되었으며, 의용생체공학의 연구개발에 대한 사회적 욕구가 점차로 커져가고 있다. 본고에서는 의용생체공 학의 정의에서부터 학문영역, 전망까지 소개하기로 한다.

This paper presents a micro-computer simulation package for the various vibratory systems. The Package consists of 10 programs which describe the dynamical characteristics of the vibratory system. The programs have been written in BASIC (Appoesoft) language and programmed on the 6502 CPU with 48 KRAM. This simulation package is stored in 5 $^1/_4$ inch floppy disk. The user requires no simulation expertise on the part of designer. Through a process of disk operation, the user can easily under- stand how to use this package.

This paper examined strain distribution and radius of curvature of the bulge by finite element method and investigated limit polar thickness strain to predict the formability of sheet metal as we substituted effective strain and the radius of curvature obtained by FEM into instability condition equation successively. In experiment, the radius of curvature and limit polar thickness strainwere obtained by Moire method. Also, a concent- ric set of photogrid circles was used to measure the strain of arbitrary point and mild steel was used as material. This results obtained are as follows: 1) The radius of curvature obtained by FEM is in good agreement with the Moire experimental value. 2) The polar thickness strain is getting larger as the inside is approached from the edge. This means that fracture occurred near the ploe. 3) The circumferential strains agree closely with the meridian strains and the polar thickness strain is about twice the circumferential (or meridian) strain. This result agrees with the fact that anisotropy coefficient (R-value) obtained by tensile test is about one. 4) The theoretical results of limit polar thickness strain obtained by authors' method are better agreement with experimental results than other theoretical results. Therefore, we can better predict the formability of sheet metal with authors' method.

The WILDHABER-NOVIKOV gear, one of the circular arc gears, has the large contact area between the convex and concave profiled mating teeth, moves from one end of the tooth to the other axially making a face contact. Hence it provides a large load capacity than the Involute gear and still satisfying the law of gearing. In order to analyze the gear stress, a photoelastic investigation was carried out. Photo elastic model of the WILDHABER-NOVIKOV gears were made of Araldite CT200 in this investigation. For both the many teeth gear and the few teeth gear segments, External gears of all addendum type WILDHABER-NOVIKOV gear and the involute gear were tested. Included were the models with various profile raddi at the same pressure angle 20 .deg. and module 13.5. The flank stresses and fillet stresses of these gears were observed in each case and compared with those of gears. From this investigation, the following results were obtained. A. In the case of having many teeth gear: As the profile radius is increased, the fillet stresses of the WILDHABER-NOVIKOV gear become the same or less than that of the INVOLUTE gea, and the flank stress becomes smaller than that of the INVOLUTE gear. Therefore the better design condition is satisfied with a large profile radius. B. IN the case of having a few teeth gear: As the profile radius is increased the flank stress of WILDHABER-NOVIKOV gear becomes smaller than that of the INVOLUTE gear, but the fillet stresses become larger than that of the INVOLUTE gear. Therefore the larger design condition is satisfied with small profile radius.

The purpose of this paper is to predict the cutting force, utilizing new model of double cutting edge which has normal rake angle and tool inclination angle. Changing side, back rake angle and side cutting edge angle in the new model. Three dimensional cutting force was obtained by the use of .eta. /c=i proposed by Stabler and energy method for three dimen- sional cutting force. Theoretical results has been calculated with development of optimization algorism which can be put into three dimensional theory, using the method of least square with orthogonal cutting data. IT is proved that three dimensional cutting force is to be predicted accurately only if orthogonal cutting force by equalizing theoretical result and experimental result has been calculated.