• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
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• pp.363-366
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• 2005

When widening or repairing concrete deck slab, there is a joint inevitably. However, joining-construction method have following problem, that is the additional stress in existing part of bridge resulting from the specific process of joining-construction and the difference of amount of shrinkage between new and existing bridge. On this study, compared shrinkage stress of the direct joining construction method with the indirect joining construction method, and concluded the proper substitution rate of expansion cement. The rate of replacement was proper at $10\%$. but more than $15\%$, concrete had excessive expansion and weeker compressive strength. The time of placing closure concrete, considering the shinkage stresses and creep, was suitable in $45\~60$ days after placing the new concrete deck slab.

• 콘크리트학회지
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• 제6권6호
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• pp.143-150
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• 1994

교량의 확폭공사에는 대개 기설부와 신설부 교량을 일체화시키는 접합시공법이 행해지고 있다. 그러나 접합시공법은 설계 및 시공상 여러 가지 복합적인 문제를 야기시킨다. 본 연구는 피로실험을 통하여 접합시공에 따른 제반 문제점중 확폭교량 시공방법에 따른 휨피로거동과 콘크리트 양생시 기설부 교량을 통과하는차량에 의해 발생하는 진동이 신설부 교량에 미치는 영향을 조사하고자 실시하였다. 연구결과, 초기에 접합부 철근에서 약간을 응력집중현상 및 철근과 콘크리트간에 슬립현상이 관찰되었으나 전체적인 거동은 유사하였으며, 무수축합시공법이 신설부 교량의 콘크리트 양생중 발생하는 진동의 영향을 완화시킬 수 있음을 알 수 있었다.

• 콘크리트학회지
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• 제6권3호
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• pp.152-161
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• 1994

교량의 확폭공사에는 대개 기설부와 교량을일체화시키는 접합시공법이 행해지고 있다. 그러나 접합시공방법은 설계 및 시공상 여러 가지 복합적인 문제를 야기시킨다. 본 연구는 실험 및 구조해석을 통하여 접합시공에 따른 제반 문제점중 확폭교량 시공방법에 따른 구조거동과 콘크리트 양생시 기설부 교량을 통과하는 차량에 의해 발생하는 진동이 신설부 교량에 미치는 영향을 조사하고자 실시하였다. 연구결과, 낮은 하중에서 접합면에 휨균열이 발생하였고, 접합부 철근에서 약간의 응력집중현상 및 철근과 콘크리트간에 슬립현상이 관찰되었으나, 접합시공에 따른 전체적인 강도의 감소는 미소하였다. 또한, 신설부 교량의 콘크리트 양생중 진동에 의한 강도의 감소는 없음을 알 수 있었다.

• Journal of applied mathematics & informatics
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• 제25권1_2호
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• pp.455-470
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• 2007

In phylogenetic tree construction the neighbor-joining algorithm is the most well known method which constructs a trivalent tree from a pairwise distance data measured by DNA sequences. The core part of the algorithm is its cherry picking criterion based on the tree structure of each quartet. We give a generalized version of the criterion based on the exact box model of quartets, known as the tight span of a metric. We also show by experiment why neighbor-joining and the quartet consistency count method give similar performance.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 봄 학술논문 발표대회
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• pp.233-234
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• 2023

This paper confirms the application sites of dry coupler technology, which is a direct connection method using screw threads, and Unlike wet couplers, this method can stand on its own without proof support and continuous work on the upper part. Furthermore, concludes with personal considerations to improve constructability.

• 한국주거학회논문집
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• 제20권4호
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• pp.31-38
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• 2009

In our country, the application of the design method of face to face dimension in wall-slab apartment has passed 10 years. So MC(Modular Coordination) design method has fixed in the design step to some degree. In Design and Work Execution of House the exclusive area of the apartment was calculated by face to face dimension. And the term of face to face dimension was known broadly to clients, construction company, etc. But design method of face to face dimension is not to simply extend the room size so far as wall depth in design process but to ensure the actual space should be considered with efficient use and assembly of building components. That is to say, Design method of face to face dimension is not to be defined by design step but to be related with construction and maintenance. However in construction process the point of face to face design method was not understood even now. So the purpose of this study was to extract the effect and question of face to face design method in construction process by survey of actual condition of structure and construction quality, and compare this result with existing construction method. The following project of this study is to survey of actual condition of interior components such as gypsum board, windows & doors etc. Therefore this study is to induce architectural long-life through architectural standardization construction and component's exchange, and, by the subject of the study on Apartment to have design guideline and basis for joining part between Gypsumboard and windows.

• 대한수학회논문집
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• 제25권1호
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• pp.149-160
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• 2010

Among the distance based algorithms in phylogenetic tree reconstruction, the neighbor-joining algorithm has been a widely used and effective method. We propose a new algorithm which counts the number of consistent quartets for cherry picking with tie breaking. We show that the success rate of the new algorithm is almost equal to that of neighbor-joining. This gives an explanation of the qualitative nature of neighbor-joining and that of dissimilarity maps from DNA sequence data. Moreover, the new algorithm always reconstructs correct trees from quartet consistent dissimilarity maps.

• Journal of Welding and Joining
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• 제21권5호
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• pp.561-567
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• 2003

For construction of I-beam steel structures, a fillet welding is one of the main manufacturing process. However, this welding process cause some problems associated with welding residual stress and welding deformation that are harmful to the safety of structures. Accordingly, this study clarified the creation mechanism of the welding deformation on I-beam steel structure from the experimental results given by the FEM method. To prevent or minimize the longitudinal bending deformation, first of all, a field supervision is necessary to observe the optimal groove design. Secondly, the welding order for cooling weld zone is needed.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2006년도 춘계학술논문 발표대회 제6권1호
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• pp.31-34
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• 2006

In this study on the appliable Asphalt sheet of monolithic and inorganic matter waterproofing material using of field because of problem of complex waterproofing sheet. Before this cement polymer modified waterproof coating and appliable asphalt sheet of monolithic whether have stability by method of construction about all style waterproofing that evaluate to new method of construction development naturally big emphasis put and try to approach. Did performance test item first at, as a result, drew by suitable thing in all KS items. This is considered to have more effective spot construction work because if means that have stability by material as well as method of construction.

• Journal of Welding and Joining
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• 제10권4호
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• pp.259-267
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• 1992

In this report, a method to predict the fatigue strength in welded structure member of ship construction is studied considering the effects of statistical characteristics of mild steels and weld toe shapes on the fatigue crack initiation life. The fatigue test under pulsating bending load is carried out with the model specimens of the web frame in double bottom of ship hull. The propriety of the fatigue life curve with probability of failure in the transverse strength members of ship hull construction is confirmed by the comparison with the results of fatigue test on the model of the various transverse strength members.