• Applied Microscopy
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• 제29권4호
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• pp.417-426
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• 1999

농어의 피부는 크게 상피층과 진피층으로 구분된다. 상피층은 지지세포와 단세포선들로 구성된다. 지지세포는 표면세포, 중간세포 및 기저세포로 구분된다. 선세포는 점액분비세포와 곤봉상세포로 구분되는데, 이들의 분포밀도는 곤봉상세포가 더 높다. 표면세포는 편평형 또는 입방형이며 세포질에는 조면소포체가 잘 발달되어 있으며, microridge가 뚜렷하다. 표면세포들은 membrane interdigitation구조와 부착반에 의해서 다른 세포들과 연결되어 있다. 중간세포는 난형이며, 전자밀도는 다른 지지세포 보다 높다. 기저세포는 입방형이며, 세포소기관의 가운데 미토콘드리아의 발달이 현저하며, membrane interdigitation 구조들이 발달되어 있다. 점액분비세포는 막으로 싸인 다수의 분비과립들을 함유한다. 곤봉상세포의 세포질은 수질부와 피질부로 구분되는데, 수질부에서는 핵, 세포소기관, 중심공포가 관찰되며, 피질부에서는 발달된 장미세섬유들이 관찰된다. 곤봉상세포들은 잘 발달된 membrane interdigitation구조와 부착반에 의해서 다른 세포들과 연계되어 있다.

• Steel and Composite Structures
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• 제20권4호
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• pp.869-887
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• 2016

The socket-spigot template supporting system is widely used in engineering applications in China. As a newer type of support structure, there has been growing research interest in its bearing capacity. In this paper, four vertical bearing capacity tests were carried out on the basic mechanical unit frame of a socket-spigot template supporting system. The first goal was to explore the influence of the node semi-rigid degree and the longitudinal spacing of the upright tube on the vertical bearing capacity. The second objective was to analyze the displacement trend and the failure mode during the loading process. This paper presents numerical analysis of the vertical bearing capacity of the unit frames using the finite element software ANSYS. It revealed the relationship between the node semi-rigid degree and the vertical bearing capacity, that the two-linear reinforcement model of elastic-plastic material can be used to analyze the socket-spigot template supporting system, and, through node entity model analysis, that the load transfer direction greatly influences the node bearing area. Finally, this paper indicates the results of on-site application performance experiments, shows that the supporting system has adequate bearing capacity and stability, and comments on the common work performance of a socket and fastener scaffold.

• 기술혁신연구
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• 제23권4호
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• pp.63-87
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• 2015

연구성과를 향상시키는 데 중요한 요인은 연구자의 역량, 연구비 등의 자원 투입 등이 지적되었다. 하지만 최근에는 공동연구가 활성화되면서 연구자 사이의 구조적 특성을 통해 지속적 상호관계를 형성하여 과학적 지식을 생산하고 있기 때문이다. 하지만 이러한 연구비 지원이 지원 자체에 그치는 것이 아니라 연구비 지원으로 인해 다수의 기관이 협력하여 연구를 수행할 수 있는 발판이 된다는 점에서 연구성과에 영향을 미치는 것으로 볼 수 있다. 즉 연구비 지원이 공동연구의 연결구조에 차이를 발생시켜 연구성과에 영향을 미치기 때문으로 추정할 수 있다. SCIE DB에서 2009년부터 2013년까지 5년간 문화기술(CT) 분야의 공동연구 논문을 대상으로 연구비 지원 여부에 따른 네트워크 구조와 연구성과의 관계를 분석한 결과 다수의 연구기관이 연결되어 있을수록 논문 편수가 증가하고 사이 중심성이 증가할수록 논문 편수는 감소하는 것으로 분석되었다. 또한 연구비 지원 여부가 네트워크 구조, 연구성과에 영향을 미치는 것으로 분석되었다.

• 국제초고층학회논문집
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• 제3권3호
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• pp.205-214
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• 2014

The super high rise building construction is characterized by a large quantity of engineering works and structural components, high demanding of construction technology and complex cross operations. As the height of super high rise building increases, the construction difficulties increase, it is challenging the steel structural building construction technology. In this paper, the key technologies in the construction of Chinese modern super high rise steel structure building have been studied. The innovative tower crane supporting frame suspension disassembly technology has been developed to allow the crane supporting frame to turnover in the air without occupying materials stockyard. A new self-elevating platform technique which is capable of striding over structural barriers has been developed. This new technology allows the platform to be self-elevated along variable cross section column with a maximum 600 mm size change. A new automatic submerged arc welding technology has also been developed to ensure the process continuity and quality stability of welding job on the construction site.

• Smart Structures and Systems
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• 제31권6호
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• pp.601-619
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• 2023

In this study, the accuracy of a real-time hybrid test (RTHT) employed for a performance test of a tuned mass damper (TMD) on an offshore wind turbine (OWT) with a complicated jacket-type supporting structure is quantified and evaluated by comparing the RTHT results with the experimental data obtained from a shaking table test (STT), in which a 1/25-scale model for a typical 5-MW OWT controlled by a TMD was tested. In the RTHT, the jacket-type OWT structure was modelled using both multiple-DOF (MDOF) and single-DOF (SDOF) numerical models. When compared with the STT test data, the test results of the RTHT show that while the SDOF model, which requires less control computational time, is able to well predict the peak responses of the nacelle and TMD only, the MDOF model is able to effectively predict both the peak and over-all time-history responses at multiple critical locations of an OWT structure. This also indicates that, depending on the type of structural responses considered, an RTHT with either an SDOF or a MDOF model may be a promising alternative to the STT to assess the effectiveness of a TMD for seismic mitigation in an OWT context.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2003년도 춘계학술발표대회 요약집
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• pp.405.2-405.2
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• 2003

• 대한치과보철학회지
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• 제35권3호
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• pp.577-608
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• 1997

The purpose of this study is to evaluate the stress distribution in the bone around dental implants supporting mandibular overdenture according to the number of implant and the type of attachment. Two or four implants were placed in an edentulous mandibular model and three dimensional photoelastic stress analysis was carried out to measure the fringe order around the implant supporting structure and also to calculate principal stress components at cervical area of each implant. The attachments tested were rigid and resilient type of Dolder bar, Round bar, Hader bar and Dal-Ro attchment. The results were as follows ; 1. In 2-implant supported overdenture using Round bar, Hader bar, and Dal-Ro attachment, compressive stress pattern was observed on the supporting structure of implant on loaded side, while tensile stress pattern in unloaded side. 2. In 2-implant supported overdenture using Dolder bar, the rigid Dolder bar shared the occlusal loads between 2 implants in a more favorable manner than was exhibited by the resilient type, while the resilient type placed a more stress on the distocervical area of the implant on the loaded side. But compressive stress pattern was observed in both the loaded and unloaded sides in either case. 3. In 2-implant supported overdenture, rigid and resilient type of Dolder bar exhibited more cross arch involvement than the Round bar, Hader bar, or Dal-Ro attachment. 4. In 4-implant supported overdenture using resilient Dolder bar and Hader bar, stress turned out to be distributed evenly among the implants between loaded and unloaded side, but thor was no reduction in the magnitude of the stress in the surrounding structure of implant contratry to 2-implant supported overdenture. 5. The stress pattern at cervical area of implant was different with the number of implant or the type of attachment but the overload, harmful to surrounding structure of implant, was not observed.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2009년도 춘계학술대회 논문집
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• pp.325-326
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• 2009

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 추계학술대회
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• pp.1322-1327
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• 2003

It is important to determine supporting locations for structural stability of a structure under non-uniform load in space interfered by other parts. In this case, There are many local optima with discontinuous design space. Therefore, The traditional optimization methods based on derivative are not suitable. Whereas, Genetic algorithm(GA) based on stochastic search technique is a very robust and general method. This paper has been presented to determine supporting locations of the vertical supports for reducing stress of the KSTAR(Korea super Superconducting Tokamak Advanced Research) IVCC(In-vessel control coil) under non-uniform electromagnetic load and space interfered by other parts using genetic algorithm. For this study, we develop a program combining finite element analysis with a genetic algorithm to perform structural analysis of IVCC. In addition, this paper presents a technique to perform optimization with FEM when design variables are trapped in an incongruent design space.

• 정보처리학회논문지D
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• 제9D권4호
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• pp.543-554
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• 2002

지리정보시스템은 처리 속도의 향상과 비쥬얼라이징의 개선이 필요하다. 이를 위해서는 맵 일반화와 레벨별 상세화 개념이 요구된다. 기존의 공간 인덱싱은 지도 일반화를 지원하지 않거나 지원하더라도 모든 지도 일반화 연산을 제공하지 않는다는 문제점을 가진다. 본 논문에서는 이를 위해 모든 일반화 연산을 지원하는 새로운 인덱스 구조인 LR트리를 제안한다. 또한 LR트리를 검색, 삽입, 삭제하기 위한 알고리즘을 기술하고, 성능 분석을 수행한다. 성능 분석을 통해 제안된 인덱스 구조가 지도 일반화를 지원하는데 있어 다른 공간 인덱싱 기법보다 우수한 성능을 나타냄을 보인다.