• 소프트웨어공학소사이어티 논문지
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• 제26권1호
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• pp.17-29
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• 2013

소프트웨어 시스템 진화는 소프트웨어 시스템의 유지보수의 일종으로 계획적이고 체계적인 유지보수 프로세스이다. 소프트웨어 진화 연구는 기존 시스템의 비용편익 분석을 통해 시스템의 유지가치에 대한 판단 근거를 제공하며, 아키텍처를 기반으로 하는 진화는 반복적인 진화 작업의 자동화를 가능케 하여 유지보수 비용 감소를 가능하게 해주는 연구이다. 본 논문에서는 아키텍처 변환패턴을 이용한 소프트웨어 시스템 진화 프레임워크를 제안한다.

• 한국농촌건축학회논문집
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• 제11권1호
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• pp.75-82
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• 2009

The goal of this study is to find a design pattern of platform of chapel according to acceptance of community's social activities and classify a forms of platform design between urban and rural community church. It was surveyed by 18 community churches including of 8 rural churches. And it was comprised in main contents that this study surveyed about social functions of church and composition of room, a transformation of worship and platform, and furniture of platform. As a results of this study, I could suggest a conclusions as follows; firstly, community churches are trying hard to make their social functions wide and deep. Secondly it was necessary for them to prepare a spaces and rooms for service of community people like a social welfare and christian cultural activities. Thirdly, the form of platform and style of worship were serviced by transformation for the acceptance of community requirements. Finally, the service style of chapel and platform have been transformed in a view point of accommodation of community since early 2000.

• 한국농촌건축학회논문집
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• 제13권4호
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• pp.115-124
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• 2011

This study examines the process of urban formation in the city of Yanji. The analysis is done by the change of street pattern and major facility location in a timely manner by appling space syntax method. This research categorizes the pattern of the urban growth focused on two urban forms, street and major buildings, in the city and is offered of the meaning of the first value on interpretation of the urban growth in the city of Yanji. The result of the research are as follows. First, the period of the city transformation is divided into four stage; intuitive period, grid-iron formative period, consolidation period, and urban expansion period. Second, characteristics of each stage have been analyzed. At the first stage, the city started to frame along both buildings and streets which were placed without a plan. At the second stage, the city was planned and constructed into new grid-iron pattern ignoring existing context by Jananese colony. At the consolidation period, the road system expands from the city center toward suburban. At the last expansion period, the shape of the city has complicated its shape with complex road system. This study contributes to provide a basic analysis and data to investigate how the Yanji city has evolved over period of time. But further continuous research should be done for future urban development of the Yanji city.

• 인터넷정보학회논문지
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• 제24권1호
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• pp.9-15
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• 2023

SPA(Single-Page Application)는 RESTful API와 통신을 위해 데이터의 변환을 필요로 한다. BFF(Backend for Frontend) 패턴은 이 변환을 서버에서 처리하고 있으나 통신 횟수를 증가시키고 개발과 배포를 어렵게 하는 문제가 있다. 본 연구에서는 SPA의 ViewModel과 RESTful API의 모델을 SPA에서 직접 매핑하는 아키텍처를 제안한다. 제안한 아키텍처는 RESTful API의 문서 모델인 OpenAPI 사양을 이용하여 RESTful API 모델과 ViewModel 간의 매핑 모델을 자동 생성한다. SPA의 통신 컴포넌트는 생성된 모델을 이용하여 RESTful API 데이터와 ViewModel을 자동 변환한다. 사례 연구를 통해 기존 BFF 방식과 비교한 결과 제안한 아키텍처는 BFF에 비해 높은 개발 생산성을 보였고 부하테스트 결과 BFF에 비해 약 6 %이상 낮은 서버 CPU 점유율을 기록하였다.

• 한국전산구조공학회논문집
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• 제30권4호
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• pp.275-282
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• 2017

본 논문에서는 변형에 의해 유발된 패턴변화(pattern transformation)에 기반하여 압축(compression)과 인장(tension) 하중 모두에서 음의 포아송 비(negative poisson's ratio)를 나타내는 다공성(porous) 구조를 제안한다. 기존에 개발된 원형 구멍을 이용한 구조는 연결선(ligament)의 회전 모멘트 부족으로 인해 인장 시 양의 포아송 비를 나타내는 한계점이 있었으며, 타원형 구멍을 이용한 구조는 응력집중 현상으로 인하여 내구성(durability)이 약한 문제점이 있었다. 이에 본 연구에서는 휘어진 연결선의 배열을 통하여 인장하중 하에서의 회전 모멘트를 증가시키는 동시에 응력집중 현상을 완화하고 변형에너지(strain energy)를 구조물 전반에서 고르게 흡수하도록 설계하였다. 이를 통해 10%의 공칭 변형률(nominal strain) 범위 내의 압축과 인장 모두에서 음의 포아송 비를 가지며, 기존 모델에 비하여 강성(stiffness)과 내구성이 개선된 구조를 개발하였다. 비선형 유한요소해석을 통하여 기존 타원형 구멍 모델과의 비교를 수행하였으며 제안된 모델이 구조의 강성과 내구성 측면에서 현저히 개선됨을 확인하였다.

• 한국주거학회논문집
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• 제27권3호
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• pp.11-22
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• 2016

In Germany, during the modern architectural movements diverse experiments for the propagation of modern housing solutions were conducted that succeeded to the spirit of Bauhaus. Therefore, the study traced how Walter Gropius adopted the trends of architectural style and aesthetic, the concept of production, the concept for new typology of housing, and issues in urban architecture. According to the results, processes to the 'sachlich' style could be seen in the cases of early and latter works of detached houses and further aesthetic changes of later works. Second, Gropius expanded his design field from detached houses to multiple dwelling and it was accompanied by typological transformation of buildings considering the industrialization and production of housing. Third, in the cases of multiple dwelling, it could be identified that site planning of housing complexes and building arrangement reflected a shift from traditional urban pattern to new alternatives suitable for mass housing supply. Thus, changes in the genealogy and propensity of German residential designs were partly summed up and their implications on modern housing architecture were discussed.

• Structural Engineering and Mechanics
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• 제88권5호
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• pp.439-449
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• 2023

Non-linear vibration characteristics of functionally graded CNT-reinforced composite (FG-CNTRC) cylindrical shell panel on elastic foundation have not been sufficiently examined. In this situation, this study aims at the profound numerical investigation of the non-linear vibration response of FG-CNTRC cylindrical panels on Winkler-Pasternak foundation by introducing an accurate and effective 2-D meshfree-based non-linear numerical method. The large-amplitude free vibration problem is formulated according to the first-order shear deformation theory (FSDT) with the von Karman non-linearity, and it is approximated by Laplace interpolation functions in 2-D natural element method (NEM) and a non-linear partial derivative operator H_NL. The complex and painstaking numerical derivation on the curved surface and the crucial shear locking are overcome by adopting the geometry transformation and the MITC3+ shell elements. The derived nonlinear modal equations are iteratively solved by introducing a three-step iterative solving technique which is combined with Lanczos transformation and Jacobi iteration. The developed non-linear numerical method is estimated through the benchmark test, and the effects of foundation stiffness, CNT volume fraction and functionally graded pattern, panel dimensions and boundary condition on the non-linear vibration of FG-CNTRC cylindrical panels on elastic foundation are parametrically investigated.

• Architectural research
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• 제25권2호
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• pp.29-40
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• 2023

The purpose of this study is to analyze the conflicts caused by the spatial expansion in two types of urban heritage in Seoul. To explain the national and professional orientation found in each spatial transformation, the study brought the concept of 'historic state' and 'epitome,' thereby examining the operating system of the conflicts. Field observations and stakeholder interviews were performed based on literature and historical research. The study results are as follows. ①In the case of Gwanghwamun and Donuimun, the spatial expansion is to find the historic state of the sites. Gwanghwamun with high national status and substance, conflicts show a pattern that spreads to memory conflicts. Donuimun is relatively unknown and has no substance so that a flexible method of digital restoration was applied. ② In the case of Ikseon-dong and Bukchon hanok, they show heterogeneous spatial expansion. The conflicts in relation to this is caused by the epitome of hanok. In Ikseon-dong, illegal installation of structures(non-epitome) is prevalent, while in Bukchon, there was a process of transferring the new basement(non-epitome) as part of the hanok. ③Conflicts in Gwanghwamun can be coordinated by referring to the digital restoration of Donuimun, and conflicts in Ikseon-dong can be resolved by taking Bukchon as a precedent.

• 한국학교수학회논문집
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• 제9권4호
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• pp.539-556
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• 2006

본 연구는 남녀학생의 학습을 공평하게 향상시킬 수 있는 방법을 모색하기 위한 일환으로, GSP를 사용한 테셀레이션 활동이 중학교 남녀학생의 수학적 성취도와 수학적 성향에 어떠한 영향을 미치는가를 알아보기 위한 것이다. 중학교 남녀학생의 4학급을 대상으로 컴퓨터 환경의 기하적 교수학습자료가 2005년 2학기 3개월에 걸쳐 사용되었으며 사전, 사후 검사지로 자료수집이 이루어졌다. 연구결과는 테셀레이션 활동을 하였을 때 기하의 변환 학습의 성취도에서 유의미하게 차이가 났으며 여학생이 남학생보다 우수하였다. 이는 기하 또는 테크놀로지 환경에서 선행연구의 결과와 크게 대조를 이루는 것으로 매우 높은 여학생의 학습 성취 결과는 여학생들이 이런 종류의 학습 환경을 지원받았을 때, 자신들이 활동한 것을 학습요소와 더 잘 연결함을 나타낸다. 수학적 성향에서는 여학생들은 유의미한 수준은 아니었지만 긍정적인 변화를 나타내었고 향상도가 가파르게 상승하는 것으로 보아, 이보다 장기간의 테셀레이션 활동을 하게 된다면 더욱 유의미한 산출물을 가져올 것으로 예측할 수 있었다.

• International Journal of Naval Architecture and Ocean Engineering
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• 제5권2호
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• pp.227-245
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• 2013

Reliable strength assessment of the Liquefied Natural Gas (LNG) cargo containment system under the sloshing impact load is very difficult task due to the complexity of the physics involved in, both in terms of the hydrodynamics and structural mechanics. Out of all those complexities, the proper selection of the design sloshing load which is applied to the structural model of the LNG cargo containment system, is one of the most challenging one due to its inherent randomness as well as the statistical analysis which is tightly linked to the design sloshing load selection. In this study, the response based strength assessment procedure of LNG cargo containment system has been developed and proposed as an alternative design methodology. Sloshing pressure time history, measured from the model test, is decomposed into wavelet basis function targeting the minimization of the number of the basis function together with the maximization of the numerical efficiency. Then the response of the structure is obtained using the finite element method under each wavelet basis function of different scale. Finally, the response of the structure under entire sloshing impact time history is rapidly calculated by synthesizing the structural response under wavelet basis function. Through this analysis, more realistic response of the system under sloshing impact pressure can be obtained without missing the details of pressure time history such as rising pattern, oscillation due to air entrapment and decay pattern and so on. The strength assessment of the cargo containment system is then performed based on the statistical analysis of the stress peaks selected out of the obtained stress time history.