• Proceedings of the Korean Geotechical Society Conference
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• 2003.03a
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• pp.147-152
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• 2003

The purpose of this paper is to develope an understanding of fundamental mechanism of shear behaviour between granite and concrete interfaces. The interface of pile socketed in rock can be modeled in laboratory tests by resolving the axisymmetric pile situation into the two dimensional situation under CNS(constant normal stiffness) direct shear condition. In this paper, the granite core samples were used to simulate the interface condition of piles socketed In granite. The samples were prepared in the laboratory to simulate field condition, roughness(angle, height), stress boundary condition, and then tested by CNS direct shear tests. This paper gives some points about shearing behaviour of socket piles into domestic granite through the analysis of CNS tests results.

• Proceedings of the Korean Geotechical Society Conference
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• 2003.03a
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• pp.431-438
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• 2003

The domestic design method for the shaft resistance of drilled shafts into a bedrock Is based on the empirical method, where the uniaxial compressive strength of rock specimen is utilized for calculation of the shaft resistance. This method has uncertainties in prediction of capacity of drilled shafts and result in uneconomic engineering design. Recently a new improved design method was suggested, which reflects important factors that affect the strength of pile sockets. Socket roughness is one of significant factors influencing the shaft resistance of drilled shaft socketed into rock In this paper roughness information for the shaft resistance design of socket pile was suggested on the basis of statistical analysis of data measured from wall surface In the bore holes of drilled shafts.

• Proceedings of the Korean Geotechical Society Conference
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• 2005.10a
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• pp.489-498
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• 2005

In this study, the shaft resistance of drilled shafts socketed into weathered-and soft-rocks was examined by the constant normal stiffness(CNS) test. Large scale model tests were performed for different unconfined compressive strength, socket roughness, initial normal stress, and normal stiffness for identifying shear load transfer characteristics. Through comparisons with previous studies, it is found that the results by the present approach is good agreement with the general trend observed by existing empirical and analytical results.

• Proceedings of the KIEE Conference
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• 2004.10a
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• pp.34-36
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• 2004

Cable 접속장치인 정격 25.8kV 600/1200A Plug-in socket의 절연설계, 전계분포해석 및 열계해석을 위하여 전자계 및 열해석 프로그램인 Flux2D를 이용하여 simulation하였다. Plug-in접속장치의 shield형상을 변화하면서 각종 금구류 및 접속장치의 절연물의 연면전계강도를 계산하여 기준전계와 비교 검토하여 전계해석 하였다. 해석결과 shield 의 위치와 형상의 변화에 따라 socket내부의 전계강도를 완화시키는 중요한 역할을 하고 있음을 보여주고 있다. 열해석은 도체저항의 Joule 열원으로 입력하였으며, 정상상태에서의 은도 분포는 설계에 영향을 주지 않는 것으로 분석되었다.

• International Journal of Contents
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• v.9 no.1
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• pp.11-17
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• 2013

Recently, online real-time web accessible mobile devices such as smartphones, tablet PCs and application services have been developing rapidly. Hospitals also need to adopt an efficient information system that can provide decent medical services under mobile computing environments to complete future medical services. This study proposes a system in which a doctor can examine a patient and make out a prescription in a ward on a real-time based on the current Order Communication Systems (OCSs) through mobile interfaces. The proposed system implements mobile web pages using HTML5, instead of a mobile app. Web processing speed can be enhanced using the web socket and web storage functions of HTML5.

• Journal of Advanced Navigation Technology
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• v.12 no.1
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• pp.68-73
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• 2008

Recently, remote observation and control technology has grown gradually. According to use home network system and expand super-highway information network, digital video technology observation system gradually has increased. In order that the user conveniently use better than to use web browser observation system, it uses existing digital observation system, personal digital assistant and control module in the place of internet.

• Proceedings of the KSR Conference
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• 2004.06a
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• pp.967-973
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• 2004

Rock socketed drilled shafts transfer significant portion of structural loads at the socketed part. Therefore, a proper design of side and base resistances of a shaft at the socket is a major concern for the geotechnical engineers. In this study, we modified the Hoek-Brown criterion to estimate side resistance of rock socketed drilled shafts. Earlier method to compute side resistance of a shaft is linear or power functions of intact rock masses. However, side resistance is mobilized like shearing which influenced by the mechanical properties of concrete and rock masses, adhesion of rock/concrete interface, roughness of rock socket. Therefore, a single coefficient or power of uniaxial compressive strength of intact rock cannot provide accurate values of side resistance in a wide range of the uniaxial compressive strength. A new approach proposed in this study can consider in situ rock mass condition (frequency or discontinuities, weathering condition), and rock types thus, it has a wider applicability than the earlier models.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2003.10b
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• pp.138-142
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• 2003

In this study, to show well favorable characteristics of warm forged material, we compared and analyzed microstructure and mechanical properties of general hot-forged material which finished heat treatment with warm-forged material which was produced by control cooling condition. Along with this, we suggested better direction of control cooling condition to be able to remove heat treatment process while satisfying mechanical properties.

• Journal of Industrial Technology
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• v.13
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• pp.89-96
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• 1993

In this paper, an OPS(Optical Protection Socket) unit is designed and prototyped for the application in the optical CPN(Customer Premises Network). The OPS unit, which plays an important role in the CPN for the enhanced network reliability, is consisted of $1{\times}2$ optical fiber splitter, combiner, and $1{\times}1$ optical switch to be a hybrid-typed unit. Various considerations, about power burget and optical information loss have given the most practical design for OPS. From the measurement of the realized OPS unit, it has proved such as the pertinent switching delay time with minimum data loss, the perceptive ability on the ONU degradation, the switching ability on the ONU malfunction.

• Proceedings of the Korean Geotechical Society Conference
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• 2007.09a
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• pp.440-449
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• 2007

Recently, researches for side resistances of drilled shafts considering socket roughness have been conducted actively. In order for these researches, roughness measurement devices using laser sensor were developed by two research groups. The devices were only applied in boreholes with dry conditions. In this research, a roughness measurement devices using the laser sensor (BKS-LRPS) was developed, which could apply in wet conditions and also measure vertical offsets of drilled shafts. In addition, the application of the laser sensor to the geotechnical engineering proposed in this paper.