• Korean Journal of Computational Design and Engineering
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• v.11 no.4
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• pp.315-325
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• 2006

It is very often necessary to search for similar parts during designing a new product because its parts are often easily designed by modifying existing similar parts. In this way, the design time and cost can be reduced. Thus it would be nice to have an efficient similarity comparison algorithm that can be used anytime in the design process. There have been many approaches to compare shape similarity between two solids. In this paper, two parts represented in B-Rep is compared in two steps: one for overall appearances and the other for detail features. In the first step, geometric information is used in low level of detail for easy and fast pre-classification by the overall appearance. In the second step, feature information is used to compare the detail shape in high level of detail to find more similar design. To realize the idea above, a multi resolution algorithm is proposed so that a given solid is described by an overall appearance in a low resolution and by detail features in high resolution. Using this multi-resolution representation, parts can be compared based on the overall appearance first so that the number of parts to be compared in high resolution is reduced, and then detail features are investigated to retrieve the most similar part. In this way, computational time can be reduced by the fast classification in the first step while reliability can be preserved by detail comparison in the second step.

• Journal of the Korean Professional Engineers Association
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• v.44 no.6
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• pp.40-44
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• 2011

Nuclear energy in Korea began in 1958, when the Korea's atomic energy act was formulated and the relevant organizations were founded. Since then, notwithstanding the two catastrophe like TMI and Chernobyl accident, Korea made a wise decision to expand the peaceful uses of the nuclear energy as well as to localize the essential nuclear design technology of fuel and nuclear steam supply system. This decision resulted in the success of export of nuclear power plants as well as research reactor in 2010s. The Korea's nuclear policy, which well utilized 'international crisis in nuclear business' as 'opportunity of Korea to get. nuclear technology', is believed nice policy as a role model of nuclear new-comer countries. Based upon the success story of localization of nuclear technology, Korea had an eye for a niche market, which was a basis of development of SMART, Korea-made integral PWR. The operation of a SMART plant can sufficiently provide not only electricity but also fresh water for 100,000 residents. Last two years, Korea's nuclear industry team led by the Korea Atomic Energy Research Institute completed the standard design of SMART and applied to the Korea's regulatory body for standard design approval. Now the Korea's licensing authority is reviewing the design with the relevant documents, and the design team is doing its best to realize its hope to get the approval by the end of this year. From next year, the SMART business including construction and export will be explored by the KEPCO consortium.

• KIEAE Journal
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• v.11 no.2
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• pp.17-25
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• 2011

In order to provide basic data for designing the outdoor exercise environment to promote the health of the citizens, this study has analyzed the status of citizens' use of outdoor exercise places that have been supplied extensively recently and the factors affecting the citizens' choice of the places. A survey was made on 20 spots in 12 places where outdoor exercise equipment is installed to identify the characteristics of use and the factors affecting the selection of the spots and for the 1,733 survey sheets collected finally SPSS program was used to analyze the multiple answers. Major results of this research are as follows: First, since light exercise equipment mostly for bodily exercises has been installed, it has brought practical effects for the physically weak people, aged people and the people who scarcely exercise, while decreasing the users' economic burdens. Second, the scales of important factors the users think in selecting their exercise spots were 'spaciousness (2,028 times)' > 'accessibility (1,751 times)' > 'fitness (1,583' > 'supportability (1,445)' > 'community centeredness (1,260).' Third, the ratios of important factors regarding the choice of environment of outdoor exercise were 'near to walk (16.1%)' > 'nice natural environment (12.3%)' > 'always free to exercise (9.7%)' > 'shortage of exercise equipment (7.4%)' > 'possible to accompany family/neighbors (6.7%)' > 'no economic burden (6.5%).

• The Journal of Korean Institute of Communications and Information Sciences
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• v.34 no.1C
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• pp.21-27
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• 2009

We present an efficient exponentiation algorithm for a finite field $GF(2^n)$ determined by an optimal normal basis of type II using signed digit representation of the exponents. Our signed digit representation uses a non-adjacent form (NAF) for $GF(2^n)$. It is generally believed that a signed digit representation is hard to use when a normal basis is given because the inversion of a normal element requires quite a computational delay. However our result shows that a special normal basis, called an optimal normal basis (ONB) of type II, has a nice property which admits an effective exponentiation using signed digit representations of the exponents.

• Journal of the Korean Institute of Landscape Architecture
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• v.23 no.1
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• pp.157-173
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• 1995

Seowons were first established during the Koryo Dynasty and contain primate shrines for the service of ancestors and ancient sages. Seowons were located in a scenic or rural place some distance from a residential area. The direct motive for building the Seowon came from the need for transcendental concealment and evasive retirement which developed as a result of oppression of scholars The indirect motivations were the development of loaming in an idyllic natural settings and the creation of a beautiful natural environment. he purpose of tai study is to investigate the characteristics and transformation process of the location of Seowon in the Chosen dynasty. The results of this research are summarized as fellows : 1. Seowons were in hilly areas with good geographical features including a nice view of the mountains and waters. Beowons were also built on the relation place of an ancient sage and of destroyed Buddist temples. 2. The location patterns of seowon in the Choson dynasty underwent three stages with the change of time Political and social phenomena influenced the transformation of the location patterns Research in this area is at an early stage. The present study was confined to an examination of 7he characteristics and transformation process of the location of seowons. However, it is hoped that this study will offer meaningful guide for further research.

• Proceedings of the Korea Water Resources Association Conference
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• 2012.05a
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• pp.420-420
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• 2012

인류의 역사 이래로 하천관리에 있어서 치수는 주요 과제중의 하나였다. 대부분의 하천은 원활한 홍수 유통을 위해 직선화되었고 하폭은 확장되었다. 이로 인해 하천 생태계는 단순화되었고 홍수 피해 또한 줄지 않고 시가지 범람이라는 새로운 유형의 침수피해가 발생하였다. 최근까지도 홍수피해를 저감하고자 많은 노력을 기울이고 있고, 하천을 자연 친화형으로 설계, 복구하는 움직임이 활발하다. 하천을 설계함에 있어서 수치해석을 하고, 예측하는 것은 시간과 경제적인 장점으로 인해 많이 이용하고 있다. 본 연구에서는 대상지역을 프랑스 남부에 위치한 Var Catchemnt로 선정하였다. Var 유역은 $2,822km^2$의 면적, 총길이 125km, 최고 고도와 강 하구까지의 고도차가 3,000m의 급한 경사로 이루어진 유역이다. 이 지역은 매년 11월에서 1월 우기 때마다 빈번하게 홍수가 발생하는 지역으로 끊임없이 홍수에 따른 범람의 문제가 제기되고 있는 지역이다. 1994년 11월에 발생한 기록적인 폭우로 인해 최대유량 $3,500m^3/s$으로 관측되었고, 이 수치는 평균 유량의 50배에 이르는 유량이다. 이 홍수와 범람으로 인해 주변의 많은 시설이 피해를 입었으며, 도로가 유실되고, 인명피해도 상당했다. 본 연구에서는 수치해석을 위해 1차원 해석 프로그램인 DHI사의 MIKE11과 미공병단에서 개발한 Hec-Ras를 사용하였다. 홍수피해를 예방하기 위하여 가장 경제적이고 합리적인 방법은 제방의 높이를 변경하는 것으로 판단하여 수치해석을 실시한 후, 실제 데이터와의 비교를 통해 홍수를 예방하기 위한 제방의 높이를 결정하였다. Var 유역에 홍수를 예방하기 위해서는 강의 하구 쪽의 제방을 높일 필요가 있다고 판단되었다.

• Journal of the Korean Society of Food Culture
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• v.11 no.1
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• pp.71-82
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• 1996

This study understands the actual conditions and problems for making traditional Korean food into the fast food. 1. Convenience to eat and nice atmosphere with friends (25%) are the best motive of visiting fast food restaurant. 2. The frequency of eating fast food is one to three times a month and the result of analysis on interrelation of human being in social anthropology represents that the fast food represents negative (-) interrelation by increasing of the age. The opinion about the fast food's nutrition is that the fast food lacks the nutrition (23.3%) and has excessive fat (40%). 3. The consumers were satisfied with the atmosphere of the fast food restaurant and unsatisfied with it's high prices. 4. The consumers' opinion on making the traditional food into a fast food was 66.4%. The consumers' opinions on traditional food to be improved are the sanitation (37.9%), the cookery (25%), the taste (11.7%), the nutrition (10.7%) and the opinions about inheritance of the traditional food is that 87.5% of people gave positive responses.

• The Journal of Asian Finance, Economics and Business
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• v.6 no.2
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• pp.135-145
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• 2019

The paper aims to investigate the factors of brand equity affecting the purchase intention of car buyers in Ho Chi Minh City. The authors use qualitative method and quantitative research to study the matters, specifically using scales and data collected for Cronbach alpha reliability testing, analysizing the discovery factor of EFA, CFA and verifying the regression models through AMOS software with SEM linear modeling. The study proposes four factors: (1) brand awareness, (2) self-expression value, (3) perceived quality, (4) brand psychology impacting on the brand loyalty and intention to buy cars of customers. The results show that all four factors are statistically significant for positive brand loyalty and purchase willing. The results showed that brand loyalty positively affects consumers' intention to buy cars. Among the factors included in the study, the brand psychology is a new factor which developed by experts in the context of Vietnam. This is the first study in Vietnam to quantify clearly the element of "crowd psychology" affecting the interests and habits of Vietnamese consumers. This explains why Vietnamese consumers prefer brands that are familiar in the market and some new cars with nice models and colors suitable for Vietnamese psychology.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.11 no.3
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• pp.33-44
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• 2001

E-commerce has various advantages such as saving the cost and no constraint on time and space, unlike real-world commerce. On the other hand, e-commerce has some important issues to solve since the commerce is conducted on the cyberspace. The issues are a mutual confidence of parties participating in the commerce as well as a method of payments. On early days, electronic cash was designed using blind digital signature to protect the personal information from being exposed and to provide the perfect anonymity for user. In this paper, a new blind signature scheme based on Feige-Fiat-Shamir digital signature is proposed, which is very efficient compared with the other schemes in terms of the computational complexity. Also, a traceable Electronic Cash System which is based on the proposed blind digital signature is designed, which has a nice feature of identifying the spender in case of using the money illegally.

• International Journal of Computer Science & Network Security
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• v.21 no.1
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• pp.125-136
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• 2021

The development of systems that can generate automatically instructional material is a challenging goal for the e-learning community. These systems pave the way towards large scale e-learning deployment as they produce instruction on-demand for users requesting to learn about any topic, anywhere and anytime. However, realizing such systems is possible with the availability of vast repositories of web information in different formats that can be searched, reused and integrated into information-rich environments for interactive learning. This paradigm of learning relieves instructors from the tedious authoring task, making them focusing more on the design and quality of instruction. This paper presents a mobile learning system (Mole) that supports the generation of instructional material in M-Learning (Mobile Learning) contexts, by reusing and integrating heterogeneous hypermedia web resources. Mole uses open hypermedia repositories to build a Learning Web and to generate learning objects including various hypermedia resources that are adapted to the user context. Learning is delivered through a nice graphical user interface allowing the user to navigate conveniently while building their own learning path. A test case scenario illustrating Mole is presented along with a system evaluation which shows that in 90% of the cases Mole was able to generate learning objects that are related to the user query.