Y-Sm-Ba-Cu-O 超傳導體의 特性 硏究

채기병,장기성,소대화 明知大學校 産業技術硏究所 1990 産業技術硏究所論文集 Vol.9 No.-

In this study, a new sintered specimens of Y₁-xSmxBa₂Cu₃Oy is composed by substituting Sm for a part of Y in the YBa₂Cu₃Oy high Te superconductor. in order to study of making (Y-Sm)-Ba-Cu-O system sintered specimens and their characteristics. And their change affected on superconductivity and their characteristics are studied by changing the x range of the composition rate. The resistances of electrical characteristics under the conditions of the composition and the temperature are measured by using Ac four probe method in the procedure of this. experiments. And it is confirmed that the Meissner effect from the superconductivity of compose S m system exists in the range of 0 < x 0.5. As for the type of the grain structure, by the SEM photographs, it is observed that the grain structures of the superconductors are formed into the stick type.

Y-Ba-Cu-O계 초전도 박막 제작 및 특성 연구

채기병,소대화,강기성 明知大學校 産業技術硏究所 1994 産業技術硏究所論文集 Vol.13 No.-

The superconducting thin films have ben deposited on the SiOx substrate by R.F magnetron sputtering using YBa₂Cu₃Ox single target. The thickness of films was 1000-2000Å with a rate of 20-25Å/min and superconducting properties were studied of thin films depend on the compositions. We have studied the superconducting thin films obtained under the various conditions in this sputtering method of fabrication and aiso analyzed SEM photograph and X-ray diffraction patterns of calcination powder to target and the thin films have an influence in addition. We could measure the annealing condition and the electric properties of superconducting thin films owing to substrate about 50K.

實用性을 指向한 大學敎養英語敎育의 改善

蔡俊基,朴英壽,金基璨 慶北大學校 語學硏究所 1983 語文硏究 Vol.8 No.-

JMX기반 클러스터에서의 효율적 스케줄링

李基哲,蔡熙星 弘益大學校 科學技術硏究所 2004 科學技術硏究論文集 Vol.15 No.-

With new Java technologies like J2ME, J2EE, JMX, Jini and JDMK, the necessity of integrating existing Java-based system functionalities arose. Moreover, with the advances of the technologies related to application servers, the use of EJB technology based application servers increased rapidly. Recently, the demand of supporting on-line multimedia contents which have multiple terabytes size data increases. To address this problem, a clustering technology which interconnects multiple computers with moderate price range has been proposed as an alternative to a single, high performance high price server. In this paper, through experiments, the adaptive characteristic and load balancing effects are presented. Our scheduling scheme has been experimented and compared with conventional methods. The experiments show promising results, opening the possibility of using clustered Java-based systems for general purposes. Our system proves to adapt to various situations and balance its load effectively.

技術集約度와 尖端技術産業

李琪彩 培材大學校 1996 培材論叢 Vol.1 No.-

The aim of this paper is to provide useful methodology to define high technology industry which is keenly interesting issue to various people including industry policy maker, business management and regional inhabitants. They expect that high technology industry would contribute toward the alleviation of national and regional economic structural problems such as closing balance of payments deficit, promoting economic restructuring and providing employment opportunities without industrial pollution. Despite such keen interests, there is no generally accepted definition on high technology industry. When trying to summarize the nature of high technology industry, we are facing some confusions surrounding the term. As most existing definitions focus on only one aspect of technology, they offer a different list of industries termed high technology industry. Although Daniel Felsenstein and Raphael Bar-El tried to define high technology industry on the multidimensional points of view, their methodology is to simply integrate existing onedimensional definitions horizontally. This paper endeavoured to define high technology industry reflecting the complexity of technology itself. On the informational view, we defined technology as scientific knowledge which is used for human life. Such knowledge is abstract and can't be felt through five sensory organs, but is embodied in various concrete existences relating to industry and contributes to human life. We divided these technology factors into four categories. They are product technology mainly formed by R&D activities and embodied in product, process technology embodied in production facilities and equipments, labour technology mainly formed by education on or off school and embodied in human resources, and organization technology accumulated in organization itself through experiences. Using appropriate proxy variables for the four technological factors, we can measure the technological intensities of a given industry and assign dichotomous value respectively. Then the complete description of technological intensity of the industry will be one of sixteen possible combinations which represent technological profiles. This profiles will show the status of technological level of the industry in multidimensional respects and give useful informations to different people with differnet interests to high technology industry. However, this paper suggests only conceptual methodology without empirical study. To test the usefulness of the conception, empirical study is needed at industry or firm level.

多品種少量生産시스템에 대한 集團管理技法(Group Technology)의 費用函數 分析

李琪彩 培材大學校 1984 論文集 Vol.5 No.-

One of the most important problem which modern production management faces is to increase productivity of small lot size with a variety of products system. Mass production by product layout which is designed to produce standardized items successively by arranging people and equipment according to the sequence of operations performed on the product is the most effective method for productivity improvement. However, the product layout can not be applicable to small lot size with a variety of products system which more and more manufacturing industries including machinery industy involved with, because some requirements such as volume adequate for reasonable equipment utilization, reasonably stable product demand and product standardization should be met for product layout implementation In this context, this paper intfoduced the integrated system of Material Requirements Planning (MRP) and Group Technology (G.T.) and tried to analyze process-focused cost function of Group Technology method. MRP is a tool to solve the problems of multistage add multiproduct system. It reduces end product into its component parts by product explosion and assigns the required quantities of parts to a specific time period, On the other hand,G.T. classifies the component parts into a set of part families according to the specified similarities in geometric shape and/or processing requirements The basic characteristic of G.T. is machine group/cell layout which performs all the operations required by the designated part family or families. In other words, in the practice of (croup Technology, a group of manufacturing resources including machines tools and fixtures may be arranged in line fashion so that all the parts of a specified part family can be performed with one group jig or fixture and set-up. Group jig and fixture are designed to accept all parts of the part family, with adapters which accommodate some minor variations of parts. As a group of equipment is designated to each part family, there is fixed cost in Group Technology method. Instead, variable cost per part fairly decreased, compared with that of the conventional method (functional layout method for small lot size with a variety of products). And the fixed cost is compensated for by the decreased variable cost i.e. contribution margin. Group Technology, however, can not be applicable to all kinds of small lot size and a variety of products. The objective of this proper is to make clear what is the major factor to increase productivity in G.T. and what is the prerequiste for G.T. implementation in the respect of manufacturing process cost For the purpose, this paper anal iced the break-even point of the conventional method and Group Technology method, the limit of possible cost reduction by G.T. and the leverage affect for the two method. The analyses were performed through cost function on manufacturing process and the result is summarized in the equations of (5) through (10). In conclusion, as the effect of productivity improvement in Group Technology method wholy depends on the relations of the number of part in part family, fixed cost and contribution margin. the analysis among these basic variables should be performed to evaluate the validity of Group Technology method implementation The basic assumptions and limitations in this study are to limit the analysis object only in the manufacturing process cost. As the Group Technology is not only a production technique but also a management concept, the economic benefit of the G.T will be achieved in broad field of the company. Besides, the analysis also has general limitations of BEP analysis. Despite the limitations above mentioned, the cost function analysis seems to be applicable to evaluate the economic justification in the respect of manufacturing process cost for the implement of G.T

위암에 대한 형태계측학적 연구

서재홍,임성철,기근홍 朝鮮大學校 附設 醫學硏究所 1991 The Medical Journal of Chosun University Vol.16 No.2

In gastric carcinomas including 20 cases of intestinal type and 20 cases of diffuse type, in adenoma (10 cases), and in metaplastic gastritis(10 cases), the presence of lactoferrin was investigated by immunohistochemistry. An evident reactivity for lactoferhn was encountered in intestinal type carcinomas, adenomas, and incomplete intestinal metaplasia. The problems in identifyng the steps in the pathogenesis of gastric cancer and in the calssification of its preneoplastic lesions led to a throughout analysis of the morphologic features of metaplastic gastritis, adenoma and adenocarcinoma of the gastric mucosa. Recently, several morphologic features with possible diagnostic significance have been identified among these parameters, several cytologic features seem to be of major importance for the quantitative analysis of the stepwise develop merit of malignancy. We have chosen to study nuclear and cytoplasm measurements as seen in gastric biopsied specimens. The results obtained were as follow: 1) Incomplete intestinal metaplasia, adenoma and intestinal type adenocarcinoma were stained with lactoferrin 2) Nuclear and cytoplasmic areas of incomplete metaplasia (50±14㎛_(2), 147±38㎛_(2)), Adenoma (56±16㎛_(2), 149±44㎛_(2)), Well differentiated adenocarcinoma(57±16㎛_(2), 152±48㎛_(2)), Moderate differentiated adenocarcinoma (44±14㎛_(2), 118±33㎛_(2)), Poor differentiated adenocarcinoma (54±16㎛_(2), 97±30㎛_(2)) and diffuse type adenocarcinoma (33±10㎛_(2) 434±124㎛_(2)) were noted. 3) Nuclear and cytoplasmic ratio of incomplete metaplasia(0.34±0.02), adenoma (0.38±0.02), well differentiated adenocarcinoma( 0.38±0.02), moderately differentiated adenocardnoma (0.37±0.02), Poor differentiated adenocarcinoma(0.56±0.01), and diffuse type adenocarcmoma (0.08±0.02) were noted.

기술 혁신과 혁신 자산

이기채 배재대학교사회과학 연구소 2004 사회과학연구 Vol.25 No.-

The purpose of this paper is to describe and explain the mechanism of technological innovations and its commercial exploitation. R&D is widely used as an indicator of functional asset for producing technological innovation. But R&D conception does not grasp the full spectrum of relevant assets for innovative activities of the firm. In this regard, Christensen suggested more richly faceted framework for analyzing assets for technological innovation which is based on resources and capabilities of the firm. According to the framework, technological innovation assets are classified into four categories such as scientific research assets, process innovative assets, product innovative application assets and aesthetic design assets. And Teece argued the importance of functional complementary assets to appropriate the rent from the technological innovation produced. In this paper we explained technological innovation and its commercial exploitation in terms of innovative asset profile category and complementary asset in a integrated perspective.

점진성과 직교성에 기반한 은닉 유닛을 이용한 학습기능 강화

李基哲,蔡熙星 弘益大學校 科學技術硏究所 2001 科學技術硏究論文集 Vol.12 No.-

The number of attributes of real world data are sometimes too high for any data mining technique to be applied directly. The removal of redundant and unnecessary attributes is very essential to improve the efficiency of data mining systems. A novel method is proposed here, which substantially reduces the dimensionality of data by incrementally and orthogonally adding attributes in back-propagation networks. Basically, a new attribute is found in the form of a weight vector between a new hidden unit and the input layer. The weight vector of a new hidden unit is learned and orthogonally rotated until maximum orthogonality is obtained, and incrementally added. The experiments show that our method substantially reduces the dimensions of real world data, and still the resulting transformed data can be used to produce rules (or a system) which exhibit higher recognition rates.

RIETAN 시뮬레이션에 의한 YBCO 초전도체 결정구조 전이에 관한 연구

이상운,채기병,소대화 明知大學校 産業技術硏究所 1995 産業技術硏究所論文集 Vol.14 No.-

In this study, we have tried to focus on the practical use of YBCO high temperature superconductor as an excellent part in electronic field. When we verify the characteristic improvement of superconductance and accurate reproduce and so forth, we made use of RIETAN, we changed the lattice constant and oxygen content from 6.0 to 7.0 as for the transition of orthogonal structure and tetragonal structure at superconductor, at the result we proved that transition from tetragonal structure to orthogonal structure was made at the point of 6.6(oxygen content) by using the simualtion. In addition, we proved that the transition peak of structure is transient from 2θ=32.587。 to 2θ =32.908。 at the tetragonal peak. and is transient from 2θ=32.877。 to 2θ= 32.908。. at the tetragonal peak. Also, major oxygens are located at O(2) and O(3) at tetragonal structure and are located at O(3), O(4), and O(5) at orthogonal structure, when tertagonal structure is converted into orthogonal structure. At the result of above passage, we verified that the transition point of oxygen-ion orthorhombic critical Point is 6.6.