• 한국농촌건축학회논문집
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• 제14권4호
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• pp.11-18
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• 2012

This study is to establish the dwelling principle and architectural characteristics of Powhatan Indian Community in Eastern part of North America. To find a pattern and dwelling principle of town building and housing, I have researched both site survey of Powhatan at Jamestown Settlement in Virginia and a related references of North America Indian. In addition of study, I have tried to understand their life style in 17C, a spatial characteristics of space composition, and a using materials of Yehakin which means Powhatan's house in the exhibition hall of Jamestown Settlement. The results of this paper are as follows: First, the form of Powhatan house is like a longhouse which has two types that are oblong and rectangular house. Usually they had lived in the style of oblong house. Second, there are three patterns to set up the semi-permanent settlement of Powhatan, which are circle-type, street-type, and free-type of village. Third, the fire place of interior space that is most importance element to heat and cook is put it into the center of room, and the other beds and shelves are arranged by the side of wall which is covered of rush matt.

• 한국소음진동공학회논문집
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• 제27권1호
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• pp.5-13
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• 2017

Noise complaints among neighbors in apartment building are mainly caused by floor impact noise that is structure born noise due to occupant induced floor vibration. To control this noise problems many researchers have investigated floor systems and finishing materials. Light-weight impact noise affects by finishing materials, but heavy-weight impact noise induced by heel impacts during normal walking or jumping of children is concerned with structural system and floor vibration. To figure out the characteristics of floor impact noise and transmission of floor vibration due to human activities, vibration tests were conducted in apartment buildings. Impact hammer, heel drop and walking activities were loaded at center of upstairs living room, and accelerations of slabs for both upstairs and downstairs and sound pressure levels for downstairs were measured. The acceleration ratio of transmitted floor vibration to downstairs and human induced vibration in upstairs was between 0.5 and 1.0 according to slab size, wall, and load type. And floor impact noise occurred in the range of natural frequency of slab.

• 한국콘텐츠학회논문지
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• 제10권8호
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• pp.84-94
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• 2010

ESM이란 방화벽, 침입탐지시스템(IDS), 가상시설망(VPN) 등 다양한 종류의 보안 솔루션을 하나로 모은 통합보안관리시스템으로 본 연구에서의 ESM 소프트웨어의 품질평가 모델을 개발하는 것은 ESM 소프트웨어를 효과적으로 보호하기 위한 기초가 된다고 할 수 있다. 본 논문에서는 ESM 소프트웨어 분야 기반 기술을 조사하고 ESM 소프트웨어 기술, 시장, 표준 및 시험 인증 동향을 조사, 분석하여 ESM 소프트웨어의 평가 모델을 개발하고자 한다. 즉, ESM 소프트웨어의 요구사항을 반영하여 시험 모듈을 개발하여 시험방법과 더불어 시험사례를 제안하였다.

• 한국정보통신학회논문지
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• 제5권7호
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• pp.1361-1373
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• 2001

3계층 클라이언트/서버 시스템에 일반적인 방화벽을 설치하면 어플리케이션의 서버와 방화벽의 프락시 기능이 중복되어 전송속도 저하 철상이 야기된다. 따라서, 본 논문에서는 어플리케이션 서버의 프락시 기능을 정의하고 네트워크 인터페이스 카드를 어플리케이션에 추가로 장착하여 듀얼-홈드 게이트웨이를 구성하고, 어플리케이션을 보호하기 위하여 외부망과 내부망으로 분리하는 스크린드 라우터를 설치하여 스크린드 서브넷 게이트웨이를 구성하는 침입차단 시스템을 제안하였다. 본 논문에서 제안된 시스템은 3계층 클라이언트/서버 시스템에 방화벽을 설치하는 것보다 네트워크의 통신량 분산에 효과적이며, 중복된 기능을 하지 않기 때문에 고속전송이 가능하다. 또한, 방화벽 구입에 대한 비용 효과도 있다.

• Journal of Advanced Marine Engineering and Technology
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• 제28권7호
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• pp.1123-1130
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• 2004

Numerical simulations have been carried out to investigate the effect of nozzle hole geometry on the combustion characteristics of the large diesel engine. 6S90MC-C. Spray and combustion phenomena were examined numerically using FIRE code. Wane breakup and Zeldovich models were adopted to describe the atomization characteristics and NOx formation processes. Predictions on the cylinder peak pressure and NOx emission were first verified with the experimental data to confirm the reliability of numerical calculations. The comparison results showed good agreements within the range of 0.64% and 4.6% respectively. Finally, the effects of fuel spray angle and diameter on the engine performance were investigated numerically to find the optimum nozzle hole geometry considering fuel consumption, NOx emission and heat flux of the combustion chamber wall. It was concluded that the combustion gas recirculation in cylinder by changing fuel injection direction is an effective method to reduce NOx emission by about 10% with increasing fuel oil consumption, 1.4% in a large diesel engine.

• 한국마린엔지니어링학회:학술대회논문집
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• 한국마린엔지니어링학회 2005년도 후기학술대회논문집
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• pp.13-14
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• 2005

Multi-dimensional combustion analysis and experiment has been carried out to investigate the effects of the injector nozzle hole diameter and number on the NOx formation and fuel consumption in HYUNDAI HiMSEN engine. The behavior of spray and combustion phenomena in diesel engine was examined by FIRE code. Wave breakup and Zeldovich models were adopted to describe the atomization characteristics and NOx formation. Wallfilm model suggested by Mundo, et al. and auto-ignition model suggested by Theobald and Cheng were adopted to investigate the spray-wall interaction characteristics and ignition delay. The information of spray angle and spray tip penetration length was extracted from fuel spray visualization experiment and the fuel injection rate profile was extracted from fuel injection system experiment as an input and verification data for the combustion analysis. Next, the nine different nozzle configurations were simulated to evaluate the effect of injector hole diameter and number on the NOx formation and fuel consumption.

• 대한전자공학회논문지TE
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• 제37권5호
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• pp.125-131
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• 2000

본 논문에서는 제한 알고리즘을 제안하였다. 이 알고리즘은 개별 네트워크 상의 사용자가 불법으로 자료를 유출하는 것을 제한하기 위하여 별도의 스마트카드와 전자 우편 게이트웨이를 구축하여 개별 네트워크로부터 발송되는 모든 전자우편은 스마트카드에서 인증절차를 거친 후, 전자 우편 게이트웨이로 보내어지게 된다. 전자우편 게이트웨이에서는 외부 인터넷으로 나가는 전자우편을 선별하여 그것을 방화벽 전자우편 처리 프로그램으로 보내게 되며, 송신 메일 중 첨부된 파일이 있는지를 검사하여 첨부된 파일이 있으면 전자우편 데이터베이스에 기록한다. 이때 기록된 내용과 스마트 카드 인증자료를 이용하여 내부 문건 유출시 증거 자료가 되며, 미연에 유출을 자제 할 수 있게 하는 효과도 얻을 수 있다. 뿐만 아니라 본 시스템에서는 전자 우편 게이트웨이에서 사원별 필터링 환경을 관리하며 스팸 메일을 방지 할 수 있다.

• 건축역사연구
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• 제21권1호
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• pp.155-170
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• 2012

The purpose of this study is to understand the architectural space of Donggung(東宮), the Prince's Palace, and Dongjo(東朝), the King's Mother and Queen's living space, in the early Joseon Dynasty. The Royal palace can be divided into three parts, political space for king, living space for king and his family and government office. So first, we should to understand the characteristics of each space in the Royal Palace. Up to now we have looked at the architectural space of Donggung(東宮) and Dongjo(東朝) in Gyeongbokgung(景福宮), one of the Royal Palace, the result of this study is as followings. Donggung which was living space for Prince consisted of Jaseondang(資善堂), Seunwhadang(承華堂) and Kyejodang(繼照堂) in the era of King Sejong Kyejodang was demolished and Seunwhadang was destroyed by fire in King Jungjong era and was not rebuilded. This buildings The buildings consisted of Jeondang, Whudang, main gate, hapmun(閤門) and corridor or fence Donggung and Dongjo was separated wall Dong consisted of many buildings for Queen dowager, Queen and many royal concubines The arrangement of Donggung and Dongjo was assumed like as the Fig2.

• 한국농공학회지
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• 제16권2호
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• pp.3395-3409
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• 1974

The purpose of this study is to test and compare the efficiency of heating-system for materials and construction of the wall, ceiling and window in soil brick house, cement house and boulder house respectively, in order to construct ideal farm houses in rural area. The results obtained were as follows: 1. In heat conservation due to construction of walls the thermal efficiency of cement brick house was equivalent to 66.3% of that of soil brick house, and boulder house 60.3% 2. In the case of ceiling, the thermal efficiency of paper ceiling was amounted to 84.2% of that of the composite ceiling (thickness 6mm veneer+thickness. l0m chaffs), and the common ceiling putting on soil above the ceiling, 76% of the composite while the efficiency of the ceiling putting on chaffs above them was 15.8% higher than that of the paper. 3. In the case of improving the window, the double type was 12% higher than. the efficiency of single type. 4. The warming velocity of conventional house was slower but the velocity of radiation was quicker than that of experimental one. It was thought to be due to unscietific constructions of the room bottom, fire inlet and chimney, 5. The temperature gradient line was not dependad upon the amount of throwing into fuel in the rural farm house. 6. It was concluded that the final thermal efficiency of the conventional farm house was 10.6% lower than that of experimental farm house.

• 융합보안논문지
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• 제8권2호
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• pp.71-78
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• 2008

이 연구는 인터넷 망과 조직이 자체보안을 위해 별도로 구축한 내부 망을 하나의 망으로 합쳐서 통합 체계를 구축하여 경제적이며 안전하게 인터넷과 내부 응용 서비스를 사용하는 방안을 제시하고자 한다. 기존에 일부에서 사용되고 있는 망 전환 장치는 기계적인 한계가 있으며 인터넷과 내부 망을 위한 별도의 네트워크를 구성해야 하는 문제점 때문에 연동성과 보안의 목표인 인증 및 암호화에 대한 대책이 부족하고 체계 구축 시 많은 비용이 소요되는 단점이 있다. 이에 ATM Forum 역 다중화 기술과 IPSec을 적용하여 네트워크 성능을 향상하고 구축비용을 절감하며 신뢰성 있는 이중 방어 체계의 구축 방안을 제안하고자 한다. 아울러 망 관리 기술을 이용한 Scanning 공격 기술과 SNMP, Spooler Port 등의 취약점을 집중 분석한 후 본 논문에서 제안한 이중 방어 체계 기반의 대응 방안을 제시하였다.