• 한국산업정보학회논문지
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• 제7권5호
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• pp.167-174
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• 2002

본 논문에서는 타원 곡선 암호화 시스템 등에 응용되는 유한 필드 GF(2$^{m}$ )상의 모듈러 곱셈기 및 제곱기에 대한 처리 시간과 공간 복잡도를 비교 분석하였다. 이를 위하여 기존에 제시된 모듈러 곱셈기 및 제곱기를 설계하였으며, 이들을 VHDL로 기술한 후 회로를 합성하였다. 합성된 회로에 대한 기능 및 timing 시뮬레이션 결과 모두 정확한 결과 값을 얻었다. 합성된 모듈러 곱셈기 및 제곱기를 FPGA로 구현한 결과 한 클럭당 처리 시간은 시스톨릭 구조가 가장 빠르지만 지연 시간을 고려한 전체 처리 시간은 CA 구조가 가장 빠르다는 결과를 얻었다. 또한 공간 복잡도를 특성에 있어서는 LFSR 구조가 가장 우수하다는 결과를 얻었다.

• Nuclear Engineering and Technology
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• 제46권1호
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• pp.27-38
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• 2014

The Fukushima Dai-Ichi accident in 2011 has affected various aspects of the nuclear society worldwide. The accident revealed some problems in the conventional approaches used to ensure the safety of nuclear installations. To prevent such disastrous accidents in the future, we have to learn from them and improve the conventional approaches in a more systematic manner. In this paper, we will cover three issues. The first is to identify the key issues that affected the progress of the Fukushima Dai-Ichi accident greatly. We examine the accident from a defense-in-depth point of view to identify such issues. The second is to develop a more systematic approach to enhance the safety of nuclear installations. We reexamine nuclear safety from a risk point of view. We use the concepts of residual and unknown risks in classifying the risk space. All possible accident scenarios types are reviewed to clarify the characteristics of the identified issues. An approach is proposed to improve our conventional approaches used to ensure nuclear safety including the design of safety features and the safety assessments from a risk point of view. Finally, we address some issues to be improved in the conventional risk assessment and management framework and/or practices to enhance nuclear safety.

• 대한수학회논문집
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• 제11권3호
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• pp.681-694
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• 1996

Let F be a germ of analytic transformation from $(C^2, O)$ to $C^2, O)$. Let a, b denote the eigenvalues of DF(O). O is called a semi-attrative fixed point if $$\mid$a$\mid$ = 1, 0 < $\mid$b$\mid$ < 1 = 1, 0 < $\mid$a$\mid$ < 1)$. O is called a super-attractive fixed point if a = 0, b = 0. We discuss such a mapping from the point of view of dynamical systems.

• 대한수학교육학회지:학교수학
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• 제1권2호
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• pp.605-615
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• 1999

In this paper, we explain the pedagogical phenomena appeared in the learning of 0.$\dot{9}$ = 1 in terms of its intrinsic mathematical structure, and investigate the reason why such phenomena happen. Also we analyze such phenomena through the dialogue between student and teacher, and present some instruction idea from the mathematical and educational view points.

• 한국환경과학회지
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• 제12권9호
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• pp.921-934
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• 2003

The purpose of this study is to identify the characteristics and differences of borrowed landscape in traditional arbors and temples in Jeonbuk province. And this study is attempted to widespread the width of understanding the traditional landscape borrowing method for contributing in modem reception and creation of landscape architectural culture. For this, 30 traditional arbors and 30 traditional temples in Jeonbuk province were selected. The orientation of the place of view point, distance, vertical and horizontal angle were surveyed for identifying the structure of borrowed landscape. Furthermore main element, auxiliary element and a media of borrowed landscape were surveyed also. Two hypothesis were established for verifying the feasibility and real effectiveness of research results. First, the willingness of borrowed landscape shall be being in establishing traditional arbors and temples. Second, this willingness of borrowed landscape shall be accomplished in arbor space more positively than in temple space. The results of this study are as follows; 1. In temples, the surrounding landscape adapted in Buddhism principles are principally expressed, whereas in arbors, congregating landscape, variety landscape, background landscape for establishing good view point and enframed landscape are induced for making authoritative landscape as various borrowed landscape techniques. 2. The distance to borrowed landscape in temples is involved in far landscape region, whereas that in arbors is in middle and near. In comparative with temples, the arbors shows variety in distance to the borrowed landscape objects. 3. Down view borrowing is used generally in arbors, whereas upper view borrowing is used in temples at the view angle to the borrowed landscape objects. 4. Borrowed landscape objects are more considered factors than view scope in arbors. Main elements for borrowing landscape are very various arbors, but those are simple as mountains and peaks in temples. And natural elements are much more than artificial things in arbors as a media of borrowing landscape in comparative with temples.

• 한국환경교육학회지:환경교육
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• 제21권1호
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• pp.57-69
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• 2008

The purpose of Environmental subject in the Korean school is pretty much similar to that of international organization. Because it doesn't apply the characteristics of School Education to environmental education, this school environmental education purpose needs to be discussed. The purpose of this study is to establish the reasonable purpose of school environmental education by analyzing the educational views. This study have been done through review of research literature, which usually includes references and papers on environmental education, school environmental education, educational point of view, educational purpose. It analyzed three kinds of views on education: technological view on education, initiation view on education, socialization view on education. The results are as follows: The purpose of school environmental education from technological view on education is environmental education activity itself that educates students to put the environmental preservation value into action. Initiation view on education aims at school environmental education as activities that instruct students on intellectual ability in order to develop a comprehensive view of intelligence. The purpose of environmental education in school on the basis of socialization view on education focuses on activities that authoritative teachers transmit the social value of environmental preservation to students in school.

• 동력기계공학회지
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• 제17권3호
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• pp.123-133
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• 2013

This paper aimed at analyzing the psychology of the people who tunes the car from the point of view of the theory of unconscious desire. The theory of unconscious desire to approach human psychology has two features. One point is that it can be applied only to human beings in the sense that animals does not have the unconscious. The other is that we can categorize some types of underlying unconscious desire instead of seeing human desire as the sundry desires according to the specific target. In this paper, we looked at the characteristics of each type of data obtained through interviews for people to tune the car from the point of view of the theory of unconscious desire.

• 대한인간공학회지
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• 제29권1호
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• pp.67-71
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• 2010

This study examined the field of view of older drivers based on their eye points. The subjects were 25 people whose age was over 65 years and 10 contrasting subjects on their 20s. For the experiment, we expanded the width of the A-pillar of a test vehicle. With a measuring apparatus designed for the study, we analyzed 3 axes of coordinates from glabella to a fixed point of the vehicle that would be used as CAD data of vehicle design. Result shows that average eye point of the older subjects was located significantly farther from the seat than that of the 20s approximately by 31.62mm(p=0.05). It was also found that the Binocular FOV was not significantly different between the older subjects and the 20s(p=0.85), and the effect of the width of the A-pillar on the FOV could not be found. We also measured the left and right side of the Ambinocular FOV of the older subjects. It was found that the older subjects had much wider visual angle than the 20s by 2.84 degree (F=4.78, p=0.01) on the left side, while the 20s showed significantly wider average angle than the older subjects by about 4.88 degree (F=4.78, p<0.05) on the right side. The results of this study can be used to improve the FOV based on the optimal eye points when designing a vehicle for older drivers.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2010년도 제34회 춘계학술대회논문집
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• pp.264-267
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• 2010

This research focuses on the development of numerical code to deal with compressible two phase flow around three dimensional objects combined with cavitation model suggested by Weishyy et al. with k-e turbulent model. The cryogenic cavitation is carried out by considering the thermodynamic effect on physical properties of cryogenic fluids in physical point of view and implementing the temperature sensitivity in the energy equation of the government equations in numerical point of view, respectively. The formulation has been extensively validated for both liquid nitrogen and liquid hydrogen by simulating the experiments of Hord on hydrofoils. Then, simulations of cavitating turbopump inducers at their design flow rate are presented. Results over a broad range of Nss numbers extending from single-phase flow conditions through the critical head break down point are discussed. In particular, thermal depression effects arising from cavitation in cryogenic fluids are identified and their impact on the suction performance of the inducer quantified.

• 한국마이크로전자및패키징학회:학술대회논문집
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• 한국마이크로전자및패키징학회 2006년도 ISMP 2006
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• pp.37-45
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• 2006

The mobile-phone which Camera was put on was released at the end of 2000 and dramatically puts up the deployment ratio because not only simple Camera but also a function that the photograph which I took is dispatched was added. It is the force that demand in this year presses 600,000,000 sale of a mobile-phone is estimated to be 960,000,000 of them in 2006, and to be able to include two errands with a support model after 3G. A person of entry to a camera-module appear much. In addition, the various kinds of products open markedly which a product comes to be known widely in the world, and the application range has opened widely, and considered QCDT come to be key issues for answer to market demand. By manufacturing industry, there is peculiar culture to each industry, camera-module is the composition the various industries. The construction of true Supply-chain becomes unavoidable to make a good product. I describe the point that the situation of each supply-chain and the direction for the future by the view point of module assembly maker.