• Journal of the Korea institute for structural maintenance and inspection
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• v.27 no.2
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• pp.8-16
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• 2023

This study evaluated a shear capacity of confined socket-bolt (CSB) shear connector developed for utilizing cast in placed pile (CIP) as a permanent underground wall. The push-out tests were performed in the specimens with different CIP types, CSB shear connector types, L/d, and concrete compressive strengths of concrete pile, and with or without waterproofing at interfaces between CIP and underground wall. Test results showed that the specimens with a H-shaped pile were fractured in the CSB shear connector, while the fracture concentrated in the concrete part of the specimens with a reinforced concrete pile was alleviated as the compressive strength of the concrete pile increased, resulting in the severe fracture of CSB shear connector. The maximum shear capacities of the specimens with high strength bolts and reinforcing bars used as CSB shear connector were approximately 1.22 and 1.20 times higher than those of the specimens with a H-shaped pile, respectively, and 1.10 and 1.16 times higher than those of the specimens with a reinforced concrete pile, respectively. Meanwhile, the maximum shear capacity was not significantly affected by the embedding length of the CSB shear connector and overlapping length of reinforcing bar. The predicted shear capacities calculated from the KDS standards were lower than the measured values of all specimens tested in this study.

• Journal of Digital Convergence
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• v.11 no.9
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• pp.357-363
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• 2013

This study aims to establish and apply a mobile office app for approving the achievements of tasks assigned to each person to investigate resulting satisfaction. This is done first by implementing the app for approval in a company with smart phones to enable tasks to be carried out any time and anywhere while the mobile office environment changes the method of carrying out tasks. More efficient work environment is expected if the system implemented in this study is improved in cooperation with customer's requirements. Matters for improving work efficiency added to the approval management system through this app will contribute to efficiently and continuously improving the mobile office environment to enhance productivity and efficiency of a company.

• Proceedings of the Korea Multimedia Society Conference
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• 2001.06a
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• pp.347-350
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• 2001

최근에는 인터넷 기술의 발전과 더불어 인터넷 사용인구가 늘어나면서 전자 상거래가 활발히 이루어지고 있다. 인터넷을 이용한 shopping Mall 개발의 장점은 상품에 대한 상세한 정보 제공과, 사용자가 시·공간적 제약에서 벗어나 언제 어디서든 상품 구입이 가능하다는 것이다. 본 논문에서는 공간적, 시간적으로 많은 노력이 필요했던 기존의 악기 구매 방식에서 인터넷(Internet) 환경을 이용하여 손쉽게 구입할 수 있도록 구현하였다. 인터넷 환경에서는 사용자가 원하는 제품에 대한 정보를 손쉽게 얻을 수 있고, 웹 상에서의 결재 시스템을 통해 쉽게 결재가 이루어져 결재와 동시에 제품 구입이 가능하다. 본 논문에서는 인터넷을 통한 악기 shopping, Mall의 설계 및 구현 방안을 기술한다.

• Fire Science and Engineering
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• v.20 no.3 s.63
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• pp.54-64
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• 2006

Rapid development of Information Technology(IT) requires new changes in overall official sections, and government also makes effort to promote the productivity and efficiency of official sections with IT. Objectives of this research are to evaluate the management of Electronic Approval System and to present the efficient way of using Electronic Approval System. In this research, we presented that the efficient use of Electronic Approval System requires systematic education, improvement of approval procedure, stability of system, improvement of system operation speed and connection with other official department.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.11b
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• pp.1003-1006
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• 2002

정보화 물결이 일반화 되어가고 있는 이 시점에 있어 컴퓨터 통신망의 중요성은 두 말 할 나위가 없다. 일반 가정에서는 일상생활의 지혜와 정보교환이 우선시되어지고, 기업 내에서는 문서 양식의 통폐합 및 간소화 뿐 만 아니라 기밀 사항이나 정보 교류가 일반화되어지고 있다. 하지만 문서의 결재방식에 있어서는 보안상의 문제점을 거론하며 번거로운 결재 방법을 이용하고 있다. 본 논문에서는 문서에 있어 전자결재의 순차적인 인증키 생성과 번거로운 인증 방식을 탈피하고자 그룹키를 생성하며. 그룹키를 이용한 단순하지만 보안상으로는 더욱 강력해진 방법을 제안하고자 한다.

• 정보화사회
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• s.93
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• pp.31-33
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• 1995

정보통신부는 새 청사 이전을 계기로 추진해 온 통합사무자동화 시스템구축을 완료해 7월 12일 오전 10시 21층 대회의실에서 경상현장관을 비롯한 관계자 100여명이 참석한 가운데 시연회를 갖고 본격 가동에 들어갔다. 이날 시연회에서는 $\blacktriangle$전자게시판을 이용한 "월간업무 실적 및 계획"과 "7월 당직명령"처리과정 $\blacktriangle$전자우편을 이용한 업무보고 $\blacktriangle$사무관이 기안한 문서를 과장.실장.차관을 걸쳐 장관이 전자결재로 결재하는 과정 $\blacktriangle$장관이 전자결재한 문서를 자동저장하고 검색하는 과정 등을 보여주었다. 한편 경장관은 본부직원 전원이 참석한 7월 월례조회 석상에서 "앞으로 이 시스템을 통하지 않으면 절대 결재받을 생각을 하지 말라"고 말해 행정정보화 정착에 강한 의지를 나타낸 바 있다.

• Journal of Korean Society of Steel Construction
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• v.23 no.6
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• pp.725-736
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• 2011

In a composite beam, a shear connector is installed to resist the horizontal shear on an interface between steel beams and reinforced concrete slabs. The steel-wire-integrated deck plate slab is commonly used at the wide section beam. Then vertical bars are installed at the upper wire of the ends of the steel truss girder to ensure safety during the construction. The new type of shear connector is made of deformed bar and steel plates, and must function as vertical bars but must have higher shear capacity. This paper examines the ways to develop and utilize this new shear connector. From the push-out experiments, a shear connector made of a continuous deformed bar and steel plate showed a higher shear capacity and ductility than a ${\phi}16$ stud connector, and functioned as a vertical bar.

• Journal of the Korea institute for structural maintenance and inspection
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• v.10 no.6
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• pp.175-182
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• 2006

In the design of composite structures, shear connectors such as headed stud, channel, perforated plate, etc, are commonly used to transfer longitudinal shear forces across the steel-concrete interface. Many researches have been conducted to improve the characteristics of different types of shear connector. This paper presents the results of 11 push-out tests performed on the new perforated rib connectors with shearing bars embedded in concrete slab under static loads. The results obtained from these tests are as following : 1) The bearing plate welded on both sides of perforated rib plate improves the stiffness and strength. 2) The capacity of perforated connectors is influenced primarily by the transverse reinforcements and shearing bars.

• Journal of the Korea Concrete Institute
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• v.26 no.2
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• pp.151-157
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• 2014

Since recently developed Ultra-High-Performance-Concrete (UHPC) provides very high strength, stiffness, and durability, many studies have been made on the application of the UHPC to bridge decks. Due to high strength and stiffness of UHPC bridge deck, the structural contribution of top flange of steel girder composite to UHPC deck would be much lower than that of conventional concrete deck. At this point of view, this study proposes a inverted-T shaped steel girder composite to UHPC deck. This girder requires a new type of shear connector because conventional shear connectors are welded on top flange. This study also proposes three different types of shear connectors, and evaluate their ultimate strength via push-out static test. The first one is a stud shear connector welded directly to the web of the girder in the transverse direction. The second one is a puzzle-strip type shear connector developed by the European Commission, and the last one is the combination of the stud and the puzzle-strip shear connectors. Experimental results showed that the ultimate strength of the transverse stud was 26% larger than that given in the AASHTO LRFD Bridge Design Specifications, but a splitting crack observed in the UHPC deck was so severe that another measure needs to be developed to prevent the splitting crack. The ultimate strength of the puzzle-strip specimen was 40% larger than that evaluated by the equation of European Commission. The specimens combined with stud and puzzle-strip shear connectors provided less strength than arithmetical sum of those. Based on the experimental observations, there appears to be no advantage of combining transverse stud and puzzle-strip shear connectors.

• Journal of the Korea institute for structural maintenance and inspection
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• v.17 no.4
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• pp.9-17
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• 2013

This paper describes an experimental program to investigate the shear behavior of insulated concrete sandwich panels (CSPs) with different types of GFRP shear connector. The study included testing of 13 insulated CSP specimens with two types of surface conditions for extruded polystyrene (XPS) insulation and various shapes of shear connectors. All specimens were loaded in direct shear by means of push-out and were consist of three concrete panels, two insulation layer and four rows of GFRP shear connectors. Load-relative slip between concrete panel and insulation response of CSP specimens has been established through push-out shear test. Test results indicate that the surface condition of insulation has a significant effect on the bond strength between concrete panel and insulation. The specimen used XPS foam with 10mm deep slot shows higher bond strength than those used XPS foam with meshed surface. Corrugated GFRP shear connectors show equivalent strength to grid GFRP shear connectors. Cross-sectional area and embedded length of shear connector have a notable effect on overall response and inplane shear strength of the CSP specimens.