• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.30 no.8
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• pp.54-59
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• 2001

바낙 공기 급기(UFAD, underfloor air distribution)는 사무실과 상업 건물의 공조를 위하여 바닥 하부 공간을 사용하는 혁신적인 기술이다. 북미에서는 UFAD가 기존 천장 공기 급기 방식에 비하여 많은 장점을 지니므로 그 수요가 날로 증가하고 있다. 잘 설계된 UFAD 시스템은 다음과 같은 장점을 지닌다. - 건물의 용도 변경에 따픈 유연성이 우수하므로 건물의 생애 주기 비용을 감소시킨다. - 개별 쾌적성 제어가 가능하므로 온열 쾌적성, 거주자의 만족도 그리고 생산성을 향상시킨다. - 거주자주변에 직접 선선한 공기를 공급하므로 환기 효율, 실내 공기질 그리고 건강 상태를 향상시킨다. - 이코노마이저 운전, 온도 성층화 그리고 낮은 정합 운전에 의하여 에너지 비용을 감소시킨다. - 설비 공간이 축소되고 표준 철골 구조에서는 콘크리트 구조체 변경이 가능하므로 새 건축 공법에서는 충고를 감소시킬 수 있다. 1995년까지만 해도 UFAD는 파격적인 설계 기법이라고 여겨졌지만, 이제 설계자와 건축업자들은 2004년까지 신축되는 사무용 건축품의 35%는 바닥을 높인 기법이 적용되며 이 중 반 정도가 UFAD를 채택할 것이라고 예측하고 있다. 2000년 2억불이라고 추정되던 바닥을 높이는 건축의 시장 규모가 2004년에는 최소 10억불이 되리라고 예측된다. UFAD는 기본 연구에 의한 정립된 표준화된 설계 기법과 지침이 아직 마련되지 않았음에도 불구하고 현재 설계, 시공되고 있다. 이라한 경향은 펄수적인 연구가 수행되어 관련 업계가 지식과 경험을 충분히 쌓기 전까지는 계속될 전망이다. 본고는 시스템 설계와 운영의 주요한 특징, 기존 방식과 비교하여 지니고 있는 잠재적인 장점, 한계와 기술 개발의 필요성, UFAD 기술 개발을 위하여 계속적으로 요구되는 연구 분야 등을 서술함으로써 현재 UFAD 기술에 대한 평가를 한다.

• Journal of the Society of Naval Architects of Korea
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• v.30 no.2
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• pp.155-160
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• 1993

A design method for web frame scantling on engine room structures was described. The parameters determining the scantling of web frame were studied on the basis of the empirical ship's data. It is found that the parameters determining the scanting of web frame consist of tween deck height, main engine and propeller excitation frequency, scantling draft, web frame spacing, the number of decks and main engine BHP etc. And a formula proposed by empirical ship's data was established in view points of static and dynamic structural behavior. In this study, it can be shown that at initial design stage, a method for web frame scantling of engine room structure is provided as very practical design processes.

• Journal of Korean Elementary Science Education
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• v.25 no.4
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• pp.407-418
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• 2006

The purpose of this study was to survey the problem of teachers' narrative reporting of children's science learning in elementary school report cards. For the purposes of this study, a questionnaire, comprised of 6 questions and an analysis tool (Cronbach's $\alpha=.70$) were developed to categorize the answers. The survey was conducted by 53 teachers, who are currently taking 5th ade in elementary school, and the results are as follows: First, they interpreted the same content of report cards in a variety of different ways. Second, they exhibited a number of different principles and criteria in terms of preparing the content of narrative report cards. Third, they experienced difficulties in preparing narrative report cards on science teaming which required explanation of complete processes. Fourth, most teachers surveyed answered that the content of their narrative reports on science learning did not communicate specifically the students' achievement and further studies. Fifth, the activities related to preparing the content of the science learning on narrative reports was widely perceived to be useless for teachers' professional development. Finally, teachers made a number of alternative proposals to overcome the current, perceived problems of teachers' narrative reporting for children's science learning in report cards. Based on the results of this analysis, alternative forms and content of narrative reports on science learning were discussed.

• Journal of Korean Academy of Nursing
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• v.24 no.1
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• pp.70-84
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• 1994

People experience health behaviors for themselves and theses have diversity according to each culture and people and further there is an inherent meaning in health behavior The purpose of this study was to explore the health cconcept of Korean people and their pattern of health behavior The research method was a questionaire including open questions and the subjests were 164 adults age from 21 to 61. The result of this study are as follows : 1. Perceived health concepts by adults were “possibility”, “responsibility”, “being free”, “happiness”, “brightness”, “power”, “life”, “importance”, “mental rest”, “state of nnonilliness”, “death” 2. Health behaviors carried out by Korean adults were “maintance of psychological comfort”, “exercise”, “work”, “maintance of balanced diet”, “having a hobby”, “eating health food”, “health check up”, “prevention of hazards”, “eating natural food”, “maintenance of personal relationships”, “rest”, “having religion”, “making contract with nature”, “relaxation”, “limit one’s tastes”. 3. The perceived purposes of health behavior by Koran adults were maintenance of a joyful life, health maintenance, health restoration, prevention of illness, achievement of reponsibility, haying a hobby, longevity, peaceful death. Korean health concepts in this study showed a trend that reflects the rule of family and forcused harmony and eating habits. Korean health behavior in this study showed a trend that forcuses on emotional comfort which reflects oriental thinking. The result of this study will contribute to build a theory of health behavior and to derive strategies of health behavior to promote health.

• Journal of Korea Game Society
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• v.14 no.5
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• pp.25-34
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• 2014

In this paper, the weak point of AOS jenre online game which occupies the majority of Korea game market of 2014 year is analyzed and to solve the problem, the enhanced design and implementation content is introduced. The proposed game is based on the custom AOS jenre format but has the TPS view and nontargeting format to enhance the action feel. To enhance the game quality, graphics, animation, effect and sound resources are organized. Game server is implemented by multithread of IOCP model to support many clients. The technical issue and design method of client and server are described.

• Journal of Korea Game Society
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• v.18 no.3
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• pp.39-48
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• 2018

The composition of the 'The Game Story' should reflect the game play and development environment. To do that, I borrowed a coordinate format called 'Spatio-temporal Coordinate Array' that was not based on text-based storytelling. I wanted to create a way for the story to describe relationship between 'action' based on time and 'object' based on space. One way to do this was to analyze the concepts using a mystery game in which Spatio-temporal Array is a large role in user's decision-making. As a result, I found that the method -Spatio-temporal coordinates- was an editor containing game play, and a setting tool capable of being used as a conceptual diagram.

• Aerospace Engineering and Technology
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• v.5 no.2
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• pp.240-247
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• 2006

Tilt rotor aircraft is a multi-configuration airplane which has three independent flight modes; helicopter, conversion, and aiplane. The control surface mixer resign is reqctired to generate and distribute efficient control forces and moments in each flight mode. In the conversion mode, the thrust vector is changed from helicopter mode to airplane, therefore the thrust vector makes undesired forces and moments which affect on pitch, roll and yaw dynamics. This paper describes the design results of control surface mixer design which minimize the undesired forces and moments due to nacelles tilting angle change for 4O% scaled model.

• Geotechnical Engineering
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• v.10 no.3
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• pp.17-32
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• 1994

To model the anisotropic behavior of soils in the case of reverse loading, an anisotropic hardening description is proposed on the basis of generalized isotropic hardening(GIH) rule. There is a core of the GIH rule in the allowance of the concept that the center of homology of isotropic hardening can be any proper stress states inside a yield surface. The plastic deformations could be represented for the condition of reverse loading, and an explicit constitutive relationship was formulated by utilizing a simple hardening function. The proposed hardening description has been compared with other anisotropic hardening models. For verification three sets of triaxial test results have been predicted for the drained and undrained behavior of overconsolidated clays and Ko consolidated clays.

• 한국HCI학회:학술대회논문집
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• 2007.02c
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• pp.158-163
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• 2007

본 논문의 목적은 PC 용으로 구축되어 있는 웹 컨텐츠를 PDA나 휴대폰과 같은 다양한 멀티플랫폼 단말기에도 제공할 수 있도록 하는 것이다. 기존의 대부분 방식은 모든 단말기에 서비스 할 수 없으므로 단말기용으로 모바일 컨텐츠를 미리 생성해 놓고 그 제한된 단말기에만 서비스하였다. 이때 가장 큰 문제점은 하나의 PC 웹 컨텐츠를 이용하여 다양한 하드웨어 특성을 가지는 모바일 단말기 마다 재생 가능한 모바일 컨텐츠를 모두 생성하는 것이다. 본 논문에서는 MPEG-21 멀티미디어 프레임워크를 이용하여 유선 웹 컨텐츠를 다양한 멀티 플랫폼 단말기에 실시간으로 맞추어 서비스하는 시스템을 제안한다. 제안한 시스템은 다양한 단말기별로 모바일 컨텐츠를 생성하는 것이 아니라 모바일 컨텐츠의 구성 및 표현방법을 MEPG-21 의 DIDL 을 이용하여 중간언어로써 기술한다. 그리고 멀티미디어 데이터 부분(Resource)만 Off-line으로 미리 변환한다. 이동단말기 접속 시 멀티미디어 서술(Description)부분을 실시간으로 변환하고 그 단말기가 사용 가능한 변환된 리소스를 통하여 단말기에 적합한 모바일 컨텐츠를 실시간으로 생성하여 서비스한다. 본 논문은 추가적으로 모바일 웹 서비스를 제공하는 과정에서 발생할 수 있는 응답시간 지연 현상을 최소화 하기 위하여 선 서비스 후 변환 방법을 제안한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.10a
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• pp.57-60
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• 2001

In this paper, I will describe the trends of multicast address allocation mechanism. IP Multicast efficiently supports this type of transmission by enabling sources to send a single copy of a message to multiple recipients who explicitly want to receive the information. Generally, MAAs server or MADCAP servers are used to allocate multicast addresses. As the need of home networking and autoconfiguring network mechanism has been increased, not only automatic host IP configuration but also automatic multicast address generation mechanism was demanded. in this paper, I will explain the automatic multicast address mechanism in a host. management techniques and the trends of multicast address generation and allocation mechanism that is bong now discussed In IETF.