• 대한기계학회논문집A
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• 제31권6호
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• pp.671-678
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• 2007

Front-side members of automobile, such as the hat shaped section members, are structures with the greatest energy absorbing capability in a front-end collision of vehicle. This paper was performed to analyze energy absorption characteristics of the hat shaped section members, which are basic shape of side member. The hat shaped section members consisted of the spot welded side member which was utilized to an actual vehicle and CFRP side member for lightweight of vehicle structural member. The members were tested under static axial loading by universal testing machine. Currently, stacking condition related to the collapse characteristics of composite materials is being considered as an issue fer the structural efficiency and safety of automobiles, aerospace vehicles, trains, ships even elevators during collision. So, energy absorption characteristics were analyzed according to stacking condition and shape of section and compared the results of spot welded side member with those of CFRP side member.

• International Journal of Advanced Culture Technology
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• 제11권2호
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• pp.267-275
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• 2023

The purpose of this study is to investigate the influence of sports center members' lifestyles on participation promotion and choice behavior. To this end, more specifically, we intend to establish and clarify a hypothetical model based on the preceding studies of facilitating factors and factors that continue to participate according to the lifestyle of sports center members. In order to achieve this research purpose, the study subjects were set as the population of male and female adults over 20 who are using sports centers in Gwangju Metropolitan City and Jeollanam-do in 2021. As for the sampling method, the sample was extracted using cluster random sampling, and 300 people were used for the actual analysis, excluding 60 copies of double-entry and insincere or unreliable questionnaires. The survey tool was modified and supplemented according to this study based on the questionnaire that had been verified for reliability and validity in previous studies, and all questionnaire items were composed of a 5-point scale. The statistical analysis used for data analysis was frequency analysis, exploratory factor analysis, reliability analysis, and multiple regression analysis using SPSS Windows 21.0 Version. The conclusions obtained in this study through data analysis by such methods and procedures are as follows. First, according to the lifestyle of sports center members, participation promotion factors were found to have a partial influence. Second, according to the lifestyle of sports center members, the selection behavior was found to have a partial influence. Third, it was found that the participation promotion factors of sports center members partially affected the choice behavior.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 2007년도 추계학술대회 및 정기총회
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• pp.459-463
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• 2007

Overlay multicast is an emerging technology for next generation Internet service to various groups of multicast members. It will take the place of traditional IP multicast which is not widely deployed due to the complex nature of its technology. The overlay multicast which effectively reduces processing at IP routers can be easily deployed on top of a densely connected IP network. An end-to-end delay problem is considered which is serious in the multicast service. To periodically optimize the route in the overlay network and to minimize the maximum end-to-end delay, overlay multicast tree is investigated with genetic Algorithm. Outstanding experimental results are obtained which is comparable to the optimal solution and the tabu search.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2002년도 봄 학술발표회 논문집
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• pp.279-284
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• 2002

Prestressed concrete(PSC) bridge structures with a number of continuous spans has been segmentally built in many countries. These methods include incremental launching method, movable scaffolding method, full staging method and balanced cantilever method. In these segmentally constructed prestressed concrete bridges, many construction joints exist and these construction joints are weak points in PSC bridges. The prestress force can be introduced prestress force continuously through the construction joints of PSC bridge superstructure using tendon couplers. The main objective of this study is to evaluate the structural behavior and ultimate flexural strength of construction joints in PSC girder bridge members. To this end, a comprehensive experimental program has been set up and a series of full-scale tests have been performed. Ultimate flexural strength of construction joint in PSC members with tendon couplers is decreased by approximately 10% for non-coupled members.

• 한국실내디자인학회논문집
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• 제23권4호
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• pp.3-11
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• 2014

The purpose of this study is to understand Archigram's architectural works by analysing Archigram, which was a little magazine issued from 1961 to 1974. Studies on the Archirgam's architectural works have been mostly focused on their projects themselves, not within the context of the medium, Archigram (little magazine). However, Archigram as a little magazine worked as a platforms where ideas and projects could be developed and communicated among the members. Therefore, this study focused on the distinct features of Archigram's architectural works which were influenced by its little magazine, Archigram. The major conclusion of this study is that Archigram's architectural works worked as media themselves; Archigram's architectural works are open-end conclusions which can be transformed and developed by other members; Archigram members created new temporality, creating 'up-to-the-minute' architecture.

• 한국해양학회지:바다
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• 제5권3호
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• pp.216-223
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• 2000

동중국해, 남해와 대한해협에서 채취한 해수 시료의 $^{228}$Ra/$^{226}$Ra방사능비와 염분을 이용하여 , 장강수(CW), 황해수(YSW) 그리고 쿠로시오수(KW)간의 혼합비율을 추정하였다. 동중국해의 경우 97년 8월 채집시료의 $^{228}$Ra/$^{226}$Ra방사능비와 염분을 이용한 혼합도는 이 지역이 KW, YSW그리고 CW순으로 세 단성분 모두의 영향을 받고 있다는 것을 나타낸다. 또한 동중국해의 경우 CW의 혼합비율은 염분만으로도 추정이 가능하였다. 남해와 대한해협의 경우혼합비율 추적자로 $^{228}$Ra/$^{226}$Ra방사능비와 염분을 이용하고 세 개의 단성분을 이용한 혼합비율추정에서 대부분의 정점은 CW의 영향이 매우 적은 것으로 나타났다. 또한 이 값들은 혼합비율 추적자로 $^{228}$Ra/$^{226}$Ra방사능비를 이용하고, CW를 제외한 두 개의 단성분만을 이용하여 추정된 혼합비율과 큰 차이를 보이지 않았다. 그러나 CW의 영향을 받을 것으로 생각되는 우기나 단성분간 정확한 혼합비율 추정이 요구될 경우 혼합비율 추정에는 세 단성분을 이용하여, $^{228}$Ra/$^{226}$Ra방사능비와 염분이 동시에 고려되어야 한다.

• Steel and Composite Structures
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• 제44권3호
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• pp.339-351
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• 2022

A mortar-filled rectangular hollow structural section (RHS) can increase a structural section property as well as a compressive buckling capacity of a RHS member. In this study, the tensile performance of newly developed mortar-filled RHS members was experimentally evaluated with various connection details. The major test parameters were the type of end connections, the thickness of cap plates and shear plates, the use of stud bolts, and penetrating bars. The test results showed that the welded T-end connection experienced a brittle weld fracture at the welded connection, whereas the tensile performance of the T-end connection was improved by additional stud bolts inserted into the mortar within the RHS tube. For the end connection using shear plates and penetrating stud bolts, ductile behavior of the RHS tube was achieved after yielding. The penetrating bars increased load carrying capacity of the RHS. Based on the analysis of the load transfer mechanism, the current design code and test results were compared to evaluate the tensile capacity of the RHS tube according to the connection details. Design considerations for the connections of the mortar-filled RHS tubes were also recommended.

• 공학교육연구
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• 제19권5호
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• pp.13-24
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• 2016

The purpose of this research is to examine the characteristics of team interaction according to the creativity of team members. Research subjects to achieve this purpose included 28 students who are in engineering education in the College of Education at A University in Daejeon and have taken robot-related courses. Through first and second MBTI, and TTCT tests, the final homogeneous and heterogeneous teams were formed, and an experimental study was conducted by developing team design activity assignment. The major research results were as follows. In terms of a comprehensive view on interaction frequency, both homogeneous team and heterogeneous team suggested had the highest frequency in suggesting opinions. However, each of the team members in the homogeneous team had different communication frequency among each other while each team member in the heterogeneous team had almost similar frequency. A microscopic analysis of the communication process of homogeneous team showed that the team members' roles were divided among each other in communication. Next, according to the microscopic analysis of the heterogeneous team's communication process, the team members exchanged opinions in the beginning, talked to themselves in words that were hard to understand the meanings, and they stopped having conversations in the end. Due to such decrease in communication, two team members could not solve the confusing state of being unable to understand each other's opinions and failed to complete their assignments. The microscopic analysis demonstrated that the homogeneous team had a smooth interaction, because when one team member suggested an opinion during a conversation, other team members agreed with it through a discussion. However, the members in the heterogeneous team experienced confusion as they could not understand each other's conversation and could not overcome this problem, leading to lack of conversations.

• 대한간호
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• 제18권4호통권102호
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• pp.64-75
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• 1979

It is natural for parents to expect to see their children grow up healthy and become a productively contributing members of the future society. Unfortunately some parents end up with handicapped children and encounter a great deal of conflicts and burden

• 한국멀티미디어학회논문지
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• 제3권6호
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• pp.633-642
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• 2000

본 논문에서는 대규모의 동적 멀티캐스트를 효율적으로 제공하기 위한 국부적 경로 배정 방법인 주 송신원기반 트리(Dominant Source-Based Tree : DSBT)를 제안하고 종단간 경비 특성을 분석하였다. 대규모의 동적 멀티캐스트는 그룹 구성 멤버가 많고 가입과 탈퇴가 빈번하기 때문에 중앙에서 경로를 배정하기에는 계산이 복잡하고, 경로 재배정 없이 경비를 제한하기 곤란하다. 이러한 문제를 개선하기 위하여 DSBT는 멀티캐스트 그룹을 주 송신원(Dominant Source : DS)과 정규화 경비 여유도(Normalized Cost Margin : NCM)의 쌍인 (DS, NCM)으로 표현하여, 그룹에 가입하려는 노드에 DS에 대하여 NCM을 만족하는 국부적인 경로를 배정한다. 이 방법은 트리닝상의 모든 경로가 NCM을 만족하므로 멤버가 추가되는 경우에도 기존 경로를 재배정하지 않고 종단간 경비를 제한다. 시뮬레이션 결과 제안된 알고리즘은 Nave 알고리즘보다 전체적인 경비를, Greedy 알고리즘보다 종단간 경비를 개선할 수 있음을 보인다.