• Defense and Technology
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• no.5 s.255
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• pp.58-69
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• 2000

로마군이 이룩한 군사적 혁신 중의 하나는 포진법과 야전 축성술에 있었다. 전투 중 매일 밤 로마군은 야전 축성을 하였다. 그리하여 로마로부터 그들이 멀리 떨어져 주둔하거나 다른 동료부대로부터 아무리 멀리 떨어져 주둔하더라도, 로마군 부대는 언제나 안전한 기지를 만들었고, 지휘관들은 공격 혹은 방어 전투를 실행할 수 있었다. 야전 축성은 신속하게 이루어졌고, 축성 작업 중에 모든 병사들은 자신이 담당할 특수한 임무를 받았으며 훈련을 통하여 로마군은 축성술에 익숙해져 있었다.

• The Science & Technology
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• v.28 no.10 s.317
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• pp.14-15
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• 1995

현대인들은 3백년 전 뉴턴이 축성한 기계론적 절대결정주의 세계관 속에서 살고있다. 과정보다 결론을 중시하는 사회는 뉴턴의 물질만능주의적 세계관의 소산이라고 할 수 있다. 현대사회는 뉴턴의 세계관으로부터 서서히 탈피해야 한다.

• TTA Journal
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• s.169
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• pp.74-75
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• 2017

만약 생각한 내용을 키보드에 쓸 필요 없이 바로 뇌에서 컴퓨터로 옮겨주는 장치가 있다면 어떨까? 미래에나 가능할 것 같은 이야기지만, 네덜란드 위트레흐트대학의 닉 랩지 교수팀이 '근위축성 측삭경화증'에 걸린 '하네케 드 브라우너(60세)'를 대상으로 뇌 임플란트 수술을 실시해 컴퓨터에 의사를 전달할 수 있도록 하는 데 최초로 성공했다. 이를 통해 최근 환자가 의사소통 능력을 되찾게 되었다고 미국의 뉴스 전문 방송국 CNN은 전했다.

• Journal of the KSME
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• v.22 no.4
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• pp.262-270
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• 1982

머지않은 장래에는 이러한 초컴퓨터와 신기술들이 유체역학의 주요한 발전을 주도하고, 오랫동안 취급하지 못하였던 난류유통도 해석할 수 있을 것이며, 복잡한 비행기 형상의 외부 유통도 발 전된 형체막형화 기법과 격자발생법 및 그래픽 기술을 이용하여 손쉽게 계산될 것이다. 금세기 말까지의 공기역학의 발전은 주로 공기의 탄성효과를 고려한 비정상압축성 공기역학에서 이루 어질 것이다.

• Journal of the Korean Society of Safety
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• v.7 no.2
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• pp.63-70
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• 1992

The aim of this research is to obtain a basic quantitative understanding of the effect of a noncondensable gas on the absorption of water vapor by a $H_2O$ / LiBr combination with n-octanol as the surfactant. Nonflowing aqueous solutions of LiBr (40,45,50 mass％) were exposed to saturated water vapor following the addition of an n-octanol sufactant (0.01 and 0.6 mass％). A small amount of a noncondensable gas (air) was allowed into the absorber (0.03 volume％) and its effect was analyzed by measuring the amount of water vapor absorbed. This study will aid to predict the performance of heat pump and safety operating condition when the noncondensable gas is not allowed in the absorber The results indicate that, in the presence of small amounts of a noncondensable gas, vapor absorption enhancement ratios are less than half o( those obtained under the same experimental conditions when a noncondensable gas is not present (1). The presence of a noncondensable gas causes the partial vapor pressure of air to increase at the vapor / liquid interface, which results in an instability of vapor absorption rate nd. hence, in an inhibition of interfacial disturbance.

• Journal of the Architectural Institute of Korea Planning & Design
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• v.34 no.11
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• pp.135-144
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• 2018

During the Late Joseon dynasty, abandoned mountain fortresses were urgently repaired for the operation of foothold mountain fortresses in Gyeongsang-do, during the Japanese Invasion of Korea in 1592 and immediately after the Qing Invasion of Korea in 1636. Immediately after the Qing Invasion of Korea, an external fortress wall was built and added to each of Cheonsaeng Fortress and Geumo Fortress to establish a system of protecting locals inside a fortress at important locations for border defense against Japan in the Yeongnam region. Cheonseng Fortress, however, did not have sufficient geographical and protection conditions as a mountain fortress for protecting people inside it; thus, Gasan Fortress was newly built to replace Cheonsaeng Fortress. Geumo and Gasan Fortresses were used in border defense against Japan during the period from King Injo's reign to the end of Joseon Dynasty, because the fortresses served the purpose of defending Nakdonggang River and middle roads located at important roads along the border in the Yeongnam region and because it was possible to quickly repair and use their existing fortress walls and internal facilities, such as middle fortress walls and ponds, that were constructed for long-term protection of locals inside the fortress. In addition, it was found, in this study, that a continuous discussion on how to supplement fortresses led to the reinforcement and improvement of fortress facilities and fortification technology through the application of major strengths of Chinese (Ming) and Japanese fortress systems.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.4
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• pp.2585-2592
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• 2015

The purpose of this study was to evaluate the shear bond strength between metal core fabricated by 3D printing and dental porcelain. Thirty metal cores were fabricated(cast 15ea, 3D printing 15ea). The porcelain for each group was builded to the metal core. Sample was loaded to shear force(crosshead speed 1mm/min) in a universal material testing machine. The fracture samples were analyzed failure aspect. The means were statistical analyzed using by Mann-whitney test(${\alpha}=0.05$). The period of experimental(metal cores fabrication, dental porcelain build up, data analysis, statistical analysis, failure aspect analysis and others) for this study took six months. The $mean{\pm}SDs$ of shear bond strength was $50.14{\pm}1.60MPa$ for the cast group, and $54.36{\pm}3.18MPa$ for the 3D printing group(p=0.035). The failure aspect showed mixed failure. As a results, metal cores fabricated by 3D printing method were clinically acceptable range.

• Journal of the Korean Institute of Traditional Landscape Architecture
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• v.30 no.4
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• pp.81-92
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• 2012

The purpose of this study is to compare values, characteristics and the world heritage listed tendency of walls in East Asia. Walls in East Asia are similar by the geographically adjacent, type, form and materials, etc. Thus to demonstrate the differentiation is not easy, but walls heritage of a tentative list or listed on the UNESCO World Heritage were discriminated by the evaluation criteria of world heritage. Hidden problems are not to be described the differences by the consistent manner. So we need efforts to separate the distinction and originality of walls according to the characteristics of each heritage. As the method of this study, we reviewed the terminology associated with the wall and then have examined the following four aspects as the characteristics of each heritage category. 1) Classification according to the function and purpose, 2) Classification according to the type and size of the walls(the length of wall), 3) Classification according to the location and topography, 4) Classification according to materials and technology(construction method). And we have analyzed the tendency of OUV(Outstanding Universal Value) of the world heritage listed wall. Also we examined the value basis of the differences and similarities presented by each heritage. In the future, we should complement the following two aspects of the wall heritage in East Asia for comparing the exact value. first, we ought to come up with a system that we can easily compare the similarities and differences of similar walls heritage. Second, we have to make every effort to describe the walls heritage by considering OUV evaluation criteria to be able to share with people all around the world.

• Proceeding of EDISON Challenge
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• 2014.03a
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• pp.654-658
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• 2014

풍력발전은 재생에너지로써 유망한 대체 에너지원으로 각광받고 있으며, 국내에서는 이미 영덕, 영양 등의 풍력단지가 가동 중에 있다. 그러나 장기간 사용되어온 터빈이 반 이상이며, 그 중에서도 바람의 영향을 많이 받는 블레이드는 끝단 Tip이 벌어지는 파손이 발생하곤 한다. Blade Field의 유지보수를 통해 수명연장이 가능하나, 형상변화로 공력특성에 영향을 미치게 된다. 본 연구에서는 MEXICO 터빈용 블레이드의 Tip부분에 대해서 EDISON을 활용하여, 수리로 인해 변경된 Blade의 공력특성 변화를 분석하였다. 형상변경은 상용 프로그램 Pontwise로 작업했으며, 익형 주위의 유동을 2D비압축성 유동으로 가정하고 EDISON CFD의 2D_Incomp-2.1_P solver를 수치해석을 수행하였다.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2005.04a
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• pp.382-385
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• 2005

본 논문에서는 자기저항 센서를 이용한 자계기반 자율주행 시스템의 자계특성을 분석한다. 자율주행 시스템에서 가장 중요한 핵심기술은 자기원으로 구성된 도로를 주행하는 차량의 현재위치 파악이다. 따라서 자계 도로위의 차량의 현재위치를 검출하기 위한 시스템의 선행조건으로 센서와 자기원 사이에 존재하는 자계의 특성을 분석하기 위한 실험 장치를 설계하고 구성하였다. 그리고 자기원의 설치간격 및 기울기에 따른 자계의 3축성분과 데이터를 획득한다. 획득한 데이터를 이용하여 3축 성분에 따른 거리정보와 방향에 따른 자계의 변화를 분석한다.