• Journal of the Korean Wood Science and Technology
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• 제42권4호
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• pp.393-406
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• 2014

방염제 도포 후 나타나는 목조건축물의 문제점을 파악하기 위해 통계자료 분석 및 현장조사를 수행하였다. 방염제 도포 후 백화현상과 단청 박락현상이 목조건축물에서 가장 빈번히 나타났다. 이러한 문제점은 기둥, 연목, 가구부재 등 방염제의 도포가 상대적으로 많이 이루어지는 건축물의 상부에서 가장 높게 나타났다. 현장에서 방염제를 도포한 건물과 도포하지 않은 건물을 파악하기 위해 P-XRF를 이용하여 총 20개 종의 원소를 분석하였다. 이 중 현장의 모든 방염제 처리구에서 황 원소(S)가 나타났기 때문에 이를 방염제 도포의 탐지자로 설정하였다. 이를 통해 현장에서 방염제의 도포를 확인할 수 있는 비파괴분석을 방법을 정립할 수 있었다. 실제 송광사(전남 순천)의 목조건축물을 대상으로 한 잔류성분분석을 통해 실제 현장적용이 가능함을 확인하였다.

• 한국지리정보학회지
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• 제11권3호
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• pp.136-150
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• 2008

항공사진이나 LiDAR 데이터를 이용하여 건물의 자동 추출에 있어서 많은 연구가 이루어졌지만, 3차원 위치정보와 영상의 형상정보라는 두 데이터의 장점을 융합하여 정확도를 향상시킬 수 있다. 이를 위하여 본 연구에서는 등고선 기반의 건물인식 알고리즘을 사용하여 LiDAR 데이터를 이용한 건물 인식 정확도를 향상시키고, 항공사진을 이용하여 건물 경계의 정교화도 추구하였다. 등고선기반 건물 인식 방법은 건물의 경계와 지붕구조물 정보를 생성할 수 있으며, 기존 TIN기반 인식 방법이나 NDSM기반 방법보다 우수한 건물 탐지 정확도를 보여주었다. 등고선으로 추정된 건물경계에 일정한 크기의 버퍼를 생성하여 항공사진의 경계영역을 한정시키고, double active contour를 사용하여 항공사진의 에지에 맞도록 건물경계를 정교화 하였다. 본 연구성과를 이용하여 향후 추출된 개체 경계의 일정 범위에서 최적의 정합을 수행하여 3차원 건물 경계를 생성할 수 있다.

• 한국강구조학회 논문집
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• 제21권4호
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• pp.413-420
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• 2009

일반적으로 대형 지붕구조나 초대형 보와 같은 대형 구조물을 양중하는 방법은 유압잭이 이용된다. 또한, 양중시 안전을 위하여 CCTV를 이용하여 각 포인트에 설치된 줄자를 모니터링하여 레벨체크를 수행하고, 상대 변위가 기설정된 한계를 벗어나면 유압잭을 정지하고 상대변위를 수동으로 조정한 후에 양중을 수행하였다. 그러나, 이러한 종래의 양중 방법은 CCTV를 육안으로 확인하여 레벨을 체크하기 때문에 정확도가 높지 않았고, 실시간 계측은 현실적으로 불가능하였다. 이러한 문제를 개선하기 위하여 자동추적형 토탈스테이션, 레이저 거리계, 데이터로거, 변형도게이지 등을 이용하여 대형 구조물 양중시 적용할 수 있는 계측-평가 시스템 구축하였다. 시스템을 구현하기 위한 프로그램 작성 후 실험실에서 시연을 통해 계측-평가 데이터의 정확성 및 활용 가능성을 평가하였으며, 안정적인 데이터 취득 및 연산을 통해 적용성이 검증되었다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2008년도 추계 학술논문 발표대회
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• pp.227-233
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• 2008

Porous concrete has large continuous voids of 20-30 % by volume, and this concrete is attractive as environmental material in Japan i.e. permeable road pavement, river bank protection with vegetation and green roof system which influence thermal environment. It is necessary to confirm the frost resistance when constructing porous concrete structure in cold region. However applicable test method and evaluation criterion of porous concrete has not defined yet. Therefore, the object of this study is to investigate the frost resistance of porous concrete and this investigation attempts to address this concern by comparing 4 kinds of specified freezing and thawing tests methods (JIS A1148 procedure A/B and RILEM CIF/CDF test) in consideration of actual environment. RILEM freeze-thaw tests are different from JIS A1148 freeze-thaw tests, which are widely adopted for evaluating the frost resistance of conventional concrete in Japan, in water absorption, cooling rate, length of freezing and thawing period, and number of freezing and thawing cycles. RILEM CIF test measures internal damage and is primarily applicable for pure frost attack. CDF test is appropriate for freeze-thaw and de-icing salt attack. JIS A1148 procedure A/B showed extremely low frost resistance of porous concrete if the large continuous voids were filled with water and the ice expansion in the large continuous voids set in during cooling. Frost resistance of porous concrete was improved by mixing coarse aggregate (G7) which particle size is smaller and fine aggregate in JIS freezing and thawing tests. RILEM CIF/CDF test showed that freeze-thaw and de-icing resistance of porous concrete was seems to be superior in that of conventional concrete.

• 한국주거학회논문집
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• 제20권3호
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• pp.11-18
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• 2009

The purpose of this study is to propose a method of developing an improved Hanok. To achieve this, an investigation was carried out on the factors of the main floor plan in the improved Hanok development and an interview was conducted with residents who live in the improved Hanok development. The conclusions obtained through this study are as follows: First, The shape of 一 was marked at the highest in the Korean traditional plan types such as 一, ㄱ and 田. It is considered that this reduces the cost of construction by simplifying the structure of the roof. Second, the size was consisted of $5{\times}3$ Kan, the Korean traditional module that determines the number of columns and expresses the position of the inner wall. However, the Kan measure ments for the bathroom and multi-purpose room differed. Third, 57.6% of the 2 bedroom units were investigated. However, 60% of the residents preferred 3 bedroom units. Fourth, the results of the relationship between the living room and the kitchen showed that the residents preferred L+DK type to LDK type by 54.2% and 45.8% respectively. Fifth, the residents preferred a bathroom constructed next to the bedroom because they considered that the improved Hanok development would be used as an Inn during holiday periods. Moreover, they desired a plan where the bathroom could be directly entered from the outside. Sixth, the design for the improved Hanok development should have a suitable multipurpose-room because 72.5% of the residents have extended their house to accommodate such a room. Seventh, 61% of the improved Hanok units had an entrance space, which does not exist in Korean traditional houses. For this reason, the Korean traditional floor (: the Maru) was avoided due to its inconvenience.

• 한국전자파학회논문지
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• 제29권10호
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• pp.745-751
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• 2018

본 논문에서는 차량 LTE 통신용 다중대역 MIMO 안테나를 설계하고, 이를 차량에 부착하여 수행한 데이터 전송률 필드테스트 측정 결과에 대한 분석을 다루고 있다. 필드테스트에 이용된 안테나는 다중대역 공진 특성 확보를 위해 다수의 스터브를 포함한 평판 구조로 LTE(0.8~0.9 GHz, 1.7~2.2 GHz), WiFi(2.4~2.48 GHz) 및 WAVE(5.8~5.9 GHz) 주파수 대역에서 동작하도록 설계하였다. 안테나 시작품을 차량의 대시보드 및 루프에 설치하고, 실험용 LTE 모뎀에 연결하여 다양한 실전파 환경에서의 데이터 전송률(throughput), 신호 대 잡음 간섭비(SINR), 참조 신호 수신 품질(RSRQ) 등을 측정하고 분석하였다. 이를 바탕으로 전계 강도에 따른 SINR과 데이터 전송률 사이의 관계를 확인하였다.

• 대한기계학회논문집A
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• 제37권9호
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• pp.1099-1107
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• 2013

본 연구에서는 알루미늄 압출재로 구성된 한국형 표준전동차모델(K-EMU)의 차체를 대상으로 치수 최적설계와 구조체 소재 변경을 통한 경량화방안에 대해 연구하였다. 우선 K-EMU 차체의 하부구조, 측벽구조, 단부구조의 부재별 두께를 현재의 압출가능 두께를 적용하여 치수 최적화 기법으로 약 14.8% 경량화 하였다. 그리고 치수최적설계 된 K-EMU 차체에 유지보수성이 좋은 고장력강(SMA570)재질의 프레임타입 하부구조를 적용하여 초기 K-EMU 차체대비 약 3.8% 경량화 된 하이브리드 차체를 도출하였다. 마지막으로 샌드위치 복합재를 하부구조와 지붕구조에 적용하여 초기 K-EMU 차체대비 약 30% 경량화 된 초경량 하이브리드 차체를 도출하였다. 도출된 차체 모델들은 모두 전동차 구조체 하중시험법을 만족하였다.

• KIEAE Journal
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• 제15권5호
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• pp.35-46
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• 2015

Purpose: This study is to research how New-Hanok R&D technologies of first stage are appearing and adapted to the New-Hanok style public buildings, especially in Daycare Center in Sunchang-gun, Korea. Unlike Hanok houses, public buildings which has special needs for the public and restricted by laws and regulations need not only new system of law incentives but also new components of New-Hnaok R&D technologies used only in Hanok house. Method: For this purpose, we checked the drawings for Daycare Center in Sunchang-gun. The drawings have been changed 6 times for the purpose of adopting New-Hanok R&D technologies of first stage and actual needs for current laws and regulations for public buildings and it reveals not only the possibilities for adapting new technologies in New-Hanok but also meetings the current and public needs for public buildings. Result: The result of this study as follows. Approximately 40-50 percent of New-Hanok R&D technologies in the first stage are adapted in Daycare Center in Sunchang-gun, and this means there are limitations in adapting New-Hanok R&D which are mainly for the Korean style houses. The main reasons are the costs still remaining high and lacking in confidence for using traditional structures and materials still under verification. Some are changed and proposed in another solutions suitable for public buildings as like truss structure system in roof.

• 한국실내디자인학회논문집
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• 제19권3호
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• pp.172-179
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• 2010

The Sydney Opera House is built on a peninsula of rock that juts out into Sydney Harbor. The site was once a landing place for ships. Utzon, Architect, designed the theatres for the Opera House to fit the shape. The two theatres were placed side by side so that they both had extensive harbor views. The Sydney Opera House is designed the foyers to take full advantage of these sights. Because the building would be seen from all sides, even from above, it was to be a piece of sculpture. The outside was as important as the inside. The audience enters from behind the stage and walks around to the foyers overlooking the harbour. The wing and backstage areas are small because of the way the foyers wrap around the theatre. The stage is made up of large platform lifts which provide the vertical movement for changing scenery. The sets come up from the workshops below stage. The flytower fits under the largest roof shell and doesn't break the skyline. The important elements are the podium, the shells and the reminders. The podium, the huge monolithic concrete structure, contains hundreds of rooms and nearly all the technical equipment. The podium is clad with pink granite slabs and seen from the water. This design eliminated a maze of fire escape stairs and, at the same time, gave people a wonderful view of the harbour. The egg shell is remarkably strong and express the form as the symbol of the site.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2007년도 Proceedings of ISRS 2007
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• pp.238-242
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• 2007

Today's commercial high resolution satellite imagery such as that provided by IKONOS and QuickBird, offers the potential to extract useful spatial information for geographical database construction and GIS applications. Digital maps supply the most generally used GIS data probiding topography, road, and building information. Currently, the building information provided by digital maps is incompletely constructed for GIS applications due to planar position error and warped shape. We focus on extracting of the accurate building information including position, shape, and height to update the building information of the digital maps and GIS database. In this paper, we propose a new method of 3D building information extraction with a single high resolution satellite image and digital map. Co-registration between the QuickBird image and the 1:1,000 digital maps was carried out automatically using the RPC adjustment model and the building layer of the digital map was projected onto the image. The building roof boundaries were detected using the building layer from the digital map based on the satellite azimuth. The building shape could be modified using a snake algorithm. Then we measured the building height and traced the building bottom automatically using triangular vector structure (TVS) hypothesis. In order to evaluate the proposed method, we estimated accuracy of the extracted building information using LiDAR DSM.