• Earthquakes and Structures
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• 제25권2호
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• pp.89-97
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• 2023

In order to obtain the impact of socket connection interface forms and socket gap sizes on the seismic performance of reinforced concrete (RC) socket prefabricated bridge piers, quasi-static tests for three socket prefabricated piers with different column-foundation connection interface forms and reserved socket gap sizes, as well as to the corresponding cast-in-situ reinforced concrete piers, were carried out. The influence of socket connection structure on various seismic performance indexes of socket prefabricated piers was studied by comparing and analyzing the hysteresis curve and skeleton curve obtained through the experiment. Results showed that the ultimate failure mode of the socket prefabricated pier with circumferential corrugated treatment at the connection interface was the closest to that of the monolithic pier, the maximum bearing capacity was slightly less than that of the cast-in-situ pier but larger than that of the socket pier with roughened connection interface, and the displacement ductility and accumulated energy consumption capacity were smaller than those of socket piers with roughened connection interface. The connection interface treatment form had less influence on the residual deformation of socket prefabricated bridge piers. With the increase in the reserved socket gap size between the precast pier column and the precast foundation, the bearing capacity of the prefabricated socket bridge pier component, as well as the ductility and residual displacement of the component, would be reduced and had unfavorable effect on the energy dissipation property of the bridge pier component.

• Computers and Concrete
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• 제13권3호
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• pp.377-387
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• 2014

This paper presents an experimental study on socket base connections of precast reinforced concrete columns. The main purpose of this study is to determine socket base connection which has the closest behavior to monolithic casted column-base joints. For this purpose, six specimens having different column-socket base connection details were tested under cyclic loading. For each test, strength, stiffness, ductility and drift ratios of the specimens were determined. Test results indicated that a suggested connection type is 10%-30% stronger than the other type of connections under lateral loading. The welded connection (PC-5) had better lateral load carrying capacity and ductility. On the other hand, performance of standard connection (PC-1) which is commonly used in construction was weaker than other connections. Thus, decision of connection type should be referred not only performance but also applicability.

• Structural Engineering and Mechanics
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• 제85권3호
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• pp.407-417
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• 2023

Precast assembled bridge piers with hybrid connection (PASP) use both tendons and socket connections. To study the seismic performance of PASP, a full-scale in-situ test was performed based on an actual bridge project. The elastic-plastic fiber model of PASP was established using finite element software, and numerical analyses were performed to study the influence of prestress degree and socket depth on the PASP seismic performance. The results show that the typical failure mode of PASP under horizontal load is bending failure dominated by concrete cracking at the joint between the column and cushion cap. The cracking of the pier concrete and opening of joints depend on the prestress degree and socket depth. The prestressing tendons and socket connection can provide enough ductility, strength, restoration capability, and bending strength under small horizontal displacements. Although the bearing capacity and post yield stiffness of the pier can be improved to some extent by increasing the prestressing force, ductility is reduced, and residual deformation is increased. Overall, there are reasonable minimum socket depths to ensure the reliability of the socket connection.

• 조명전기설비학회논문지
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• 제29권12호
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• pp.47-54
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• 2015

Normally, multiple socket-outlet is manufactured with soldered, welded permanent connection (termination). Because this procedure is very non-environmental and requires many labor forces, many companies skip this process. To solve this these problems, this research had to design permanent joint type multiple socket-outlet, develop safer multiple socket-outlet than is sold in markets. Progressing this research, we took 3 steps. First, we had to design device for fixing a frame suitable for multiple socket-outlet. Second, this multiple socket-outlet must pass fundamental standards through international standard (IEC 60884-1) and Korean standard (K 60884-1) tests. Third, it had to pass both several mechanical and electrical tests which is more strict than fundamental standards and vibration and impact tests following KS standards for enhancing its safety. After finishing 3 steps, we could obtain objective and fair data, develop environmental permanent joint type multiple socket-outlet without soldering crimped connection.

• 한국공간구조학회:학술대회논문집
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• 한국공간구조학회 2008년도 춘계 학술발표회 논문집
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• pp.37-42
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• 2008

구조물에서 케이블 부재는 압축이나 휨이 없이 인장력에 의해서 하중을 전달하는 시스템이다. 케이블 시스템은 대공간 구조의 지붕, 공기 지지구조, 프리스트레스 막구조, 케이블 네트워크 구조, 현수구조, 가이드 타워, 해양 프래트폼, 현수교 등의 구조물에 널리 사용되어 왔다. 케이블 부재는 부재 단부에 소켓, 스웨이징, 스프라이스 슬리브, 클립, 웨지, 루프 스프라이스 등에 의해서 하중을 전달 할 수 있다. 본 연구에서는 케이블 연결 소켓의 인장강도에 대한 실험을 수행하고자 한다. 실험결과에서 대부분의 시험체가 케이블이 파단하중에 도달하기 전에 소켓의 연결부에서 파단이 일어났다.

• Structural Engineering and Mechanics
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• 제50권4호
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• pp.459-469
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• 2014

One of the most important structural components of steel structures is the column-base connections which are obliged to transfer horizontal and vertical loads safely to the reinforced concrete (RC) or concrete base. The column-base connections of steel or composite steel structures can be organized both moment resistant and non-moment resistant leading to different connection styles. Some of these connection styles are ordinary bolded systems, socket systems and embedded systems. The structures are frequently exposed to cycling lateral loading effects causing fatal damages on connections like columns-to-beams or columns-to-base. In this paper, connection of steel column with RC base was investigated analytically and experimentally. In the experiments, bolded connections, socket and embedded connection systems are taken into consideration by applying cyclic lateral loads. Performance curves for each connection were obtained according to experimental and analytical studies conducted and inelastic behavior of connections was evaluated accordingly. The cyclic lateral performance of the connection style of embedding the steel column into the reinforced concrete base and strengthening of steel column in upper level of base connection was found to be higher and effective than other connection systems. Also, all relevant test results were discussed.

• 한국산학기술학회논문지
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• 제4권4호
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• pp.372-379
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• 2003

Desktop-PC의 메모리 모듈 제품을 대상으로 실장 검사를 하는데 있어 발생하는 문제점인 메인보드 메모리 연결부의 파손을 보완하기 위해 확장 카드를 개발하였다. 확장 카드 개발 전 메인보드 연결부의 파손은 하루 15％의 수준으로 잉여설비를 15％이상 확보해야 하며 수리를 전담으로 하는 인력을 필요로 하는 문제점을 가지고 있다. 확장카드의 개발로 소켓의 파손에 따른 업무 지연과 잉여설비의 capacity향상 및 작업성 개선을 통해 연간 7,800만원의 비용을 절감 할 수 있었다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 춘계 학술발표회 초청강연 및 논문집
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• pp.1250-1253
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• 2008

As a reinforcement technique, the application of removable soil nailing has been extended to solve the public grievance of typical soil nailing such as the geotechnical environmental problem and invasion of adjacent land. In the case of removable soil nailing, pullout capacity of the nail depends on the adhesive strength of a fixed socket. Because the existing fixed socket is made from a plastic product, the strength of a socket is less than a steel bar and then the yield failure by abrasion and deformation is occurred on the steel bar-socket contact surface. In this study, therefore, experimental analysis from laboratory test of a removable soil nail equipped with steel socket, improving the adhesive strength of steel bar-socket connection is performed to estimate the increase effect of pullout capacity of a soil nail.

• 한국정보처리학회논문지
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• 제6권7호
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• pp.1884-1896
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• 1999

본 논문에서는 자바 프로그래밍에서 사용될 수 있는 ATM API를 제안한다. 제안하는 자바 ATM API는 기존 Java Core API 패키지들 중에서 통신 기능을 정의하고 있는 java.net 패키지를 확장하여 순수 ATM 서비스를 제공할 수 있도록 정의한 것이다. 순수 ATM 서비스의 표준인 ATM 포럼의 "Native ATM Service : Semantic Description, Version 1.0" 규격에 따른 표준화된 ATM 서비스 기능들을 제공할 수 있도록 고려하였다. ATM서비 제공을 위해 java.net에 추가적으로 정의한 자바 ATM API용 클래스로는 ATM 어드레싱 위한 AtmAddress, ATM BLLI/BHLI 정보의 이용을 위한 AtmBLLI와 AtmBHLI, 그리고 소켓 개념의 통신 프로그래밍을 위한 AtmSocket, AtmServerSocket, AtmMulticastSocket, AtmSocketImpl 등이 있으며, ATM 통신의 장점인 연결의 특성 표현을 위해서 AtmConnAttr을 정의하였다. 본 논문에서는 또한 이렇게 정의된 자바 ATM API를 WinSock 2 환경 상에서 구현한 내용을 기술한다. 내용을 기술한다.

• Animal cells and systems
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• 제7권4호
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• pp.331-335
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• 2003

Vertebrates with different habitats have different proportions of visual cells, with the rod cells responding to scotopic vision and the cone cells responding to photopic and color vision in their retinas. The present work studied whether the kinds and arrangement patterns of the cone cells and interlocking morphology of the lens were related to the kind of preys and habitats in the genus Zacco. The retinas were observed by a light microscopy using H-E staining method and the interlocking formula of the lens fibers were investigated by a scanning electron microscopy. The interlocking formula of the lens fibers of Z. temmincki is an ' anchor and socket ' connection, and that of Z. platypus is a ' ball and socket ' connection. The cone cells of Z. platypus and Z. temmincki constituted compacted mosaic patterns of row type. Away from the center, the double and single cone cells gradually increased in diameter. Zacco temmincki had identical double cone cells and Z. platypus had non-identical double and single cone cells. The eyes of Z. temminckifeeding on a moving aquatic insects in relative limpid water and swift current of mid and upper stream have better resolution than that of Z. platypus feeding on mainly adhesive algae and some aquatic insects in slightly turbid water of mid stream.