다면 드릴의 성능 해석과 최적화

이상조,윤영식 대한기계학회 1990 대한기계학회논문집 Vol.14 No.6

본 연구에서는 다면드릴을 연구 대상으로 하여 다면 드릴의 기하학적 형상인 자들을 이용하여 드릴 작업시 추력과 토크를 예측하는 데 적합한 절삭력 예측 모델을 유도하였으며, 추력과 토크를 최소화하는 방향으로 다면드릴의 각 형상인자를 최적화 하였다. The objective of this study is to develope an optimized multi-facet drill (MFD). The principal factors that affect drilling performance are its geometry and the cutting conditions. In particular, the helix angle in the total twist angle of the twist drill, affects much morgen influence on the dynamic and static stiffness and on determining the characteristics of the chip disposal capacity of the drill. In this study, considering the helix angle as a major parameter, the model was developed. From this model, the deformation of transverse direction was simulated with the bending forces applied. The performance of a drill largely depends upon drilling forces. Comprehensive models for predicating the drilling thrust and torque are developed for the different drill geometries. The effects of MFD geometric parameters on thrust and torque are also deduced from the prediction models, from which an optimal drill geometry is found with the emphasis on minimum drilling forces.

主題와 分野에 의한 문헌 검색의 전산화 ( 單行本의 검색을 중심으로 )

이상조(Sang Jo. Lee) 한국정보과학회 1980 정보과학회논문지 Vol.7 No.2

This study proposes an interactive on-line information retrieval system by subjects and fields. By appropriate commands via terminal or card reader, this system allows indexing of new books, retrieval of related subjects by expressions and printing of retrieved results.

부착규조류 군집에 의한 섬진강 수질조사

이상조,최형섭,이근선,전상수 대한환경공학회 1999 대한환경공학회 학술발표논문집 Vol.1999 No.4

[축사] 영광과 축하를 드림

이상조 한국국어교육학회 1969 새국어교육 Vol.12 No.1

교사, 말씀 속에 흐르는 영성을 붙잡다 2 탐심은 환상의 노예다

이상조 장로회신학대학교 기독교교육연구원 2018 교육교회 Vol.472 No.-

경주 소재 문화 유산의 관광 정보화

이상조 위덕대학교 부설 신라학연구소 1997 新羅學硏究 Vol.1 No.-

화산형 실리콘 전계 방출 소자 제작 ( Fabrication of Volcano-Shaped Silicon Field Emission Array )

이상조,정복현,조형석,이승협,전동렬 대한전자공학회 1995 대한전자공학회 학술대회 Vol.1995 No.11

低開發國과 國土綜合開發計劃에 對하여

李相助 서울대학교 1966 서울대학교 論文集 Vol.12 No.-

The aim of this writing is to emphasize the importance of national comprehensive development plan in modernizing countries and to consider its content and technique. In advance of this, however, it seems necessary to make clear the concepts contained here. First, the word "underdeveloped" society has often been used by many writers and governments without any fixed meaning. Sometimes it was equalized with transitional or 'backwardness.' Whatever the exact terms may be, the fact seems almost unmovable that they call the countries of Asia, Africa and South America underdeveloped and they are transitional societies between developed or semi-developed and undeveloped ones. But though we call them just in a word 'underdeveloped' country, variety of the degree of development can be found among them in terms of their poitics, economy, society and culture. Therefor, we can say that the term is not absolute or fixed, but perhaps a matter of degree or for comparativeness. Of course, there are political, social, economic, and cultural factors to be analyzed and many others. But if we summarize many writers' opinions here in brief, the characteristics of them in comparison with developed societies seems following; (1) internal situation of chronic economic poverty, political, social instability that is hard to remove, (2) low standard of life, population increase, backward economic situation, (3) political dependence on Powers (puppets or satelite), (4) economic poverty in spite of the abundant cultural heritage, (5) remaining in a state of typically agrarian society and just elementary step of industrialization, (6) cultural gap between city and farm, per-modern elements prevailing in every part of society. Second, national development is a sort of planning technique that is to achieve national development by way of utilization, development, and conservation of natural resources in view of economic, social, cultural and other aspects of development, and securing favorous conditions for the establishment of industries and the manipulation of environment. As a legal basis, our government had enacted a law called 'National Comprehensive Construction Plan Law' that is similar with that of Japan. In regard to national comprehensive development plan it must be pointed out that its object is similar, in spite of considerable differences in its content, between those of developed countries and underdeveloped countries. Therefore, the object could be classified as following; (1) development of national resources, (2) industial development, (3) agricultural development (4) city development and redevelopment, (5) conservation of natural resources, (6) economic development, (7) social development. In recent years, this national comprehensive development plan has been major concern for every country, including developed one, and now, with increasing technical assistance of industrialized states for the underdeveloped, it raises a kind of boom. If we now turn to its content, the emphasis inevitably goes to physical planning, considering that it is a plan the main concern of which is to utilize, to develop and to conserve various natural or physical conditions. As its objective, however, could not be lied only in physical planning, the same stress should be put on economic and socio-cultural development in order to contribute to the improvement of public interest. It goes without saying that this requires continuous and integrated effort of government. But as central government cannot do all this, it is usually divided into as following; (1) National Comprehensive Development Plan (Central Government) (2) Urban and Provincial Comprehensive Development Plan (City Government, Province) (3) Local Comprehensive Development Plan (City or Province, except for the plan concerned over two provinces, Central Government) (4) Special Regional Comprehensive Development Plan (Central) National comprehensive development plan is effective only when it is established on the scientific data and survey. They provide the administrative statistics and the basis for accurate understanding of reality. Upon this basic survey a master plan must be made. The formal planning process from the establishment of a master plan to its performance, therefore, can be explained in this steps; Planning-Plan-Program-Schedule-Project-Performance. National development plan should be a long-term plan, for economic growth and possibility of investment are estimated before its performance. Such estimations will surely formulate future vision for national development. The national comprehensive development plan of underdeveloped countries, however, includes a lot of contradictions and shortcomings; lack of specific method, technique, and capital for the achievement of the plan in contrast to their enthusiasm; it is not based on scientific data and the plan remains an abstractly written paper or sentimentalism; a kind of trial and error,...... In short, the commonly found shortcomings of the plans among underdeveloped countries are the fact that they are not made after scientific survey, and consequently this results in the ignoration of reality and lack of scientific foundation. The Seoul Master Plan seems its typical case. We have never heard of the case in which a Capital master plan of a country was prepared in such a short period as 3 months. Moreover the Plan is said to be a 20 year plan. In foreign cases, 2 or 3 years were spent for the preparation of it. There months could not give any complete research and scientific survey. In conclusion, as far as national comprehensive development plan is concerned, the authorities of underdeveloped countries should take consideration into the above-mentioned points and excert their utmost effort to remove them.

안면 골졀에서 나선식 전산화단층촬영을 이용한 3차원 영상의 진단정확도와 유용성

이상조 대한영상의학회 1997 대한영상의학회지 Vol.36 No.4

숫자인식을 위한 Generalized Convex Deficiencies 특징의 제안

이상조,심재창 安東大學校 工業技術硏究所 2001 공업기술연구논문집 Vol.8 No.1

숫자 인식은 OCR(Optical Character Recognition) 분야에서 매우 중요한 부분이다. 기존의 convex deficiencies특징을 이용한 방법에서는 상하좌우의 4방향 특징으로는 샘물체 1자, 그리고 기역자 모양의 7자 (샘물체 7타)는 convex deficiencies특징의 방향이 존재하지 않아서 식별이 되지 않는 한계가 있다. 본 논문에서는 기존의 4방향에 45도 기울어진 남서, 북서, 동북, 동남의 4개 방향을 추가하여 8방향을 이용한 Generalized Convex Deficiencies(GCD) 특징 방법을 이용하여 숫자를 인식시키는 방법을 제안한다. The recognition of number is very important in the field of OCR (Optical Character Recognition). The former CD (convex deficiencies) method uses only four directional features - upper, lower, left, and right - so it is very difficult to recognize the number such as Semmul type No. 1, and "ㄱ" shaped No. 7 (Semmul type Number 7), for there are no CD directions. We propose a new feature extraction method named generalized convex deficiencies (GCD), which add new four directions - the southwest, the northwest, the northeast and the southeast - at an angle of 45 degree to the former four directions for OCR.