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Cho, Kyu-Shim The Korean Professional Engineer Association 1989 技術士 Vol.22 No.4
Whenever we see the development of technology of the past, the respective ages always Produced the development of new materials. The appearance of the new materials have been making technologies progress. In this way, we may say new materials and new technology are insparably related to each other. The technology of today has emerged between a valley of new technology of today and it is regarded as contributing to various technologies expected to be executed in the 21 century. Presently, so railed new materials mean fine cermic, high performance organic polymer, new metal materials, compound materials etc. This paper presents several new materials which are chiefly concerned with the electrical and telecommunications engineerings field and its development in Korea.
The Construction of Seoul Subway Line 3 and 4
Huh, Ginn The Korean Professional Engineer Association 1985 技術士 Vol.18 No.3
The traffic congestion of Seoul city has been one of the most serious problems to be settled since the advent of 1970s. As a means to mitigate traffic mess, the authority concerned launched the construction of subway line 3 and 4 in 1980. The two Subway lines slated for completion by 1985 cross each other and run north-south direction, passing through the metropolitan area of Seoul city fraught with high-rise edifices and large-scale shopping centers, and, in order to reduce blasting vibration, NATM was executed for a distance of 10 Km, instead of ASSM previously employed when subway line 1 and 2 were constructed. Tunnel blastings were implemented, preceded by classifying the rocks at construction area into five categories, namely, hard rock, semi-hard rock, weak rock weathered rock and silt and by calculating their respective specific charges through standard test blastings, by employing the pre-splitting and smooth blasting with drilling patterns of burn cut type, so as not to cause damages to surface structures. Most of explosives used were the slurry of low specific gravity and low velocity, and the firings executed by the use of milli-second detonators. Empiric formula were also formulated to check blasting vibrations, based on the vibration allowable values of West Germany standard, for the application to vulnerable construction zones. Should the two lines be placed for public service in 1985, about 40% of the total traffic population of Seoul city amounting to 15 million as of 1984 is estimated to be carried by subway with no difficulties.
The effects of electrolyte composition and water contents in manganese dioxide cell
Lee, Wan-Koo The Korean Professional Engineer Association 1985 技術士 Vol.18 No.3
이산화망간 건전지에 실사용되고 있는 전해액 ZnCl$_2$-$H_2O$의 조성 변화에 따른 건전지의 특성변화를 비교 검토하여, 건전지성능향상의 기본인자 및 그 변화정도를 조사코자 하였다. ZnCl$_2$ 주사용 전지계는 특히 중부하연속방전이 우수하였으며 그 이유로는 농도분극현상이 적음에 기인되며 이는 $Zn^{++}$이 본계에서는 쉽게 이동함에 있다고 간주되며 그 $Zn^{++}$ 이온의 바른 이동은 이론치보다도 다량사용하게 되는 물의 역할에 기인되고 방전에 직접 필요한 수분량과, 기타의 목적 즉 반응 침전물의 재용해, ion carrier 등으로서 이용되는 수분량은, MnO$_2$와의 비율 및 방전 부하크기에 따라 다르다.
A Simple Matrix Factorization Approach to Fast Hadamard Transform
Lee, Moon-Ho,Ahn, Seung-Choon The Korean Professional Engineer Association 1987 技術士 Vol.20 No.1
고속아다마르변환은 Cooley-Tukey 알고리즘에 의해서 발표되어졌고, 그것은 메트릭스 분할 또는 계승의 기술에 의한 것이다. 본 보문은 단순한 기생메트릭스를 크로넥커 적에 의해 앞단과 연결시켜가면서 고속아다마르 변환을 보였다. 이것은 기존에 발표된 방법에 비해 쉽게 기생메트릭스를 구할 수 있는 것을 확인했고 수학적으로 완전함을 증명했다. The development of the FHT (fast Hadamard transform) was presented and based on the derivation by Cooley-Tukey algorithm. Alternately, it can be derived by matrix partitioning or matrix factorization techniques. This paper proposes a simple sparse matrix technique by Kronecker product of successive lower Hadamard matrix. The following shows how the Kronecker product can be mathematically defined and efficiently implemented using a matrix factorization methods.