• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.6
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• pp.477-483
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• 2021

In a military maintenance system, the standard maintenance man-hour of weapon systems is a tool to estimate the maintenance capabilities of maintenance units, provide standards for determining the maintenance needs and workload, and provide basic data for establishing a maintenance plan. The standard maintenance man-hours of major weapon systems have already been derived and used, but the standard maintenance man-hour in a wartime maintenance environment has not been computed. Therefore, the standard wartime maintenance man-hours need to be derived and This study proposes a process and method of computing the maintenance man-hours. In addition, this work suggests the criteria of collecting and screening data that is necessary for estimating the standard maintenance man-hours and introduces a methodology for analyzing the characteristics of maintenance man-hour distribution in the process. The proposed process first designs a model that reflects the wartime maintenance environment, selects statistical techniques, collects maintenance data, analyzes the descriptive statistics, estimates the distribution, and finally presents representative values of maintenance man-hour. Based on the proposed method, the standard wartime maintenance man-hours of the four weapon systems were calculated, and the distribution of the maintenance man-hours was analyzed to follow a lognormal distribution, and the method presented reliable results.

• Land and Housing Review
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• v.5 no.1
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• pp.35-40
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• 2014

Site coefficient and amplification factor of current domestic Seismic Design Code (KBC-2009) have no consideration for the domestic ground condition in which the base rock is normally placed within 30m form the surface. Accordingly, in this study dynamic centrifugal test and analysis for pile foundation into sand and upper structure were achieved. and the response spectrums of free surface and basement were compared with each other. Within the period 1 sec., the measured spectral acceleration of free surface and basement was bigger than the design spectral acceleration of SC and SD site. However the measured spectral acceleration of free surface and basement for the period over 1.5 sec. was smaller than the design spectral acceleration of SC site. There was no severe difference of spectral acceleration according to the upper structure, embedded depth of foundation and free surface conditions. Consequently, normal domestic apartment housing for the period range over 1.5sec. could be design more economically applying these test result.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.11b
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• pp.1313-1316
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• 2003

최근에 공공장소에서의 보다 안정적이고 고속의 무선 인터넷 접속에 대한 욕구가 커지면서 무선랜에 대한 수요가 많아지고 있고, 유무선 사업자들은 무선랜 시장을 선점하기 위해서 서비스를 서두르고 있다. 이와 같은 무선랜환경에서 안전하게 사용자를 인증하고 서비스를 제공하기 위한 AAA 프로토콜로 Diameter Protocol 표준이 정의되었다. 이와 같은 Diameter base Protocol 표준의 관리를 위한 MIB 구조가 Diameter Base MIB에 정의되어 있다. 본 논문에서는 무선단말 사용자를 인증시켜 주고 무선랜서비스를 허가해주는 Diameter Server 를 관리하기 위한 관리 시스템을 위의 MIB 을 기준으로 해서 설계하고 구현하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.11b
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• pp.1329-1332
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• 2002

최근에 공공장소에서의 보다 안정적이고 고속의 무선 인터넷 접속에 대한 욕구가 커지면서 무선랜에 대한 수요가 많아지고 있고, 유무선 사업자들은 무선랜 시장을 선점하기 위해서 서비스를 서두르고 있다. 이와 같은 무선랜환경에서 안전하게 사용자를 인증하고 서비스를 제공하기 위해서 802.1x 표준이 정의되었다. 이와 같은 802.1x 표준의 관리를 위한 MIB 구조가 IEEE 802.1x MIB에 정의되어 있다. 본 논문에서는 무선단말 사용자를 인증시켜 주고 무선랜서비스를 허가해주는 authenticator의 입장에서 AP를 관리하기 위한 관리 시스템을 위의 MIB 을 기준으로 해서 설계하고 구현하였다.

• Journal of the Korea Concrete Institute
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• v.15 no.5
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• pp.689-696
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• 2003

Recently, Appendix A of ACI 318∼02 Code introduced the Strut-and-Tie Model(STM) procedure in shear design of deep flexural members. The STM procedure is widely used in the design of concrete regions where the distribution of longitudinal strains is significantly nonlinear, such as deep beams, beams with large openings, corbels, and dapped-end beams. Experimental study included five high-strength reinforced concrete deep beams with different detailing schemes for the horizontal and vertical reinforcement. The specimens were designed as simply supported beams subjected to concentrated loads on the top face and supported on the bottom face. At failure, all specimen exhibited primary diagonal crack running from the support region to the point load. Specimens which had mechanical anchorages(terminators) gives better representation of the load-carrying mechanism than the specimen had standard 90-degree anchorage at failure in deep flexural members. Based on the test results, shear design procedures contained in the ACI 318-99 Code, Appendix A of the ACI 318-02 Code, CSA A23.3-94 Code and CIRIA Guide-2 were evaluated. The Shear design of ACI 318-99 Code, Appendix A of the ACI 318-02 Code and CIRIA Guide-2 shown to be conservative predictions from 10% to 36% in the shear strength of the single-span deep beam which was tested. ACI 318-99 Code was the lowest standard deviation.

• Journal of the Korean GEO-environmental Society
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• v.12 no.9
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• pp.47-54
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• 2011

This study has analysed overbreaks, shotcrete rebound and the ratio between the actual quantity of shotcrete sprayed compared to designed quantity measured during a NATM tunnel construction. Based on the measurements of size of the excavated tunnel faces, an average overbreak was about 28.5 cm, which is about 260% of allowable overbreak. The measured shotcrete rebound was about 7.2% in average which is about half the allowable rebound(15%). In addition, due to overbreaks and rebound the actual quantity of shotcrete used in the tunnelling work was about 116.5 % of the designed value. It has been found from the field measurements that the quantity of shotcrete showed some relation with rock mass rating(RMR) and the standard guideline of tunnel supports, but the size of overbreak showed less correlation with RMR and the standard guideline of tunnel supports. Hence, the current tunnel design specifications stating the size of overbreak based entirely on the standard guideline for tunnel supports should perhaps be reestablished. The insight into the design guideline regarding overbreak and actual quantity of shotcrete will be reported and discussed.

• Journal of the Korean Institute of Landscape Architecture
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• v.40 no.5
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• pp.129-139
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• 2012

Recent changes in landscape architectural field, such as keen attention on central and local government, checks of other related fields, circumstances both inside and outside the construction industry, assume hostile attitude towards qualification system in landscape architecture. By securing the original function of qualification meets the environmental changes and accords to the technical development, practicality and serviceability of qualification as well as credit rating and professional status can be enforced. Framework redesign on landscape architecture National Technical Qualifications(NTQ) is required in order to meet the demand in the industrial fields and to reflect the technical changes. National Competency Standards(NCS) was selected as a precedent study to enhance the practicality and serviceability of NTQ as well as to avoid duplication on qualified requirements. It would provide a model to redesign the framework of landscape architecture NTQ. In this study, questions in NCS and in landscape architecture certification are compared and analyzed to review the suitability of the present landscape architecture certification items. In conclusion, the creation of master landscape architect under the present system, and the subdivision of the technician's license level to planting technician and the facility are recommended. The ability units to be qualified for each level, which would be used for future NTQ standards and university curriculums in relevant fields, are also suggested in this study.

• Land and Housing Review
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• v.2 no.3
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• pp.269-276
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• 2011

Recently, the chance of dew condensation in apartment buildings is increasing because of several reasons. For example, ventilation rate has been decreased because of high-insulations and airtightness for saving energy. Besides, the humidity has been made by drying washes, cooking and bathing inside of apartment buildings. However, there is lack of resonable design criteria for preventing condensation in real life and real surroundings. Therefore, this study is aimed at making a resonable design criteria of preventing condensation by measuring the indoor temperature and humidity in real life. In addition to this, it is aimed at making a resonable outdoor condition and classifying regions by using weather data. The following are the results. The interior criterion for condensation was set up $25^{\circ}C$ and a relative humidity of 55%. The outdoor criterion for condensation was set up $20^{\circ}C$, $-15^{\circ}C$, and $10^{\circ}C$ respectively for the hard frost, middle, and southern areas.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.20 no.4
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• pp.123-130
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• 2006

Airport facility is infrastructure that become external credit worthiness and linear measure of country competitive power. Among them, an airport electric power receiving and distribution facility is very important. In this paper, sorted domestic airline as 4 grades by code to accomplish standardization for airport electric power receiving and distribution facility. And established define and coverage about electric power receiving and distribution facility. And then analyze problem of existing airport and presents standardization. Finally, present standard single-line diagram by airport grade and system grade standard of airport electric power receiving and distribution facility

• Computational Structural Engineering
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• v.10 no.2
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• pp.27-33
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• 1997

현재 일본의 합성구조물의 설계에 관한 기준서는 토목학회 '강구조물의 극한강도와 설계'와 철도종합기술연구소의 '철도구조물등설계표준.동해설(강.합성구조물)'이 있다. 그리고, 토목학회.강구조위원회.강구조 극한강도 연구 소위원회에서 합성구조물의 극한강도 분과회를 조직해서, 한계상태설계법의 포멧에 따라 합성구조물의 설계지침서를 금년 여름경에 출판 할 예정이다. 본인도 합성구조물의 극한강도 분과회의 위원으로 약 3년간동안 많은 공부와 연구를 행할 수 있는 기회를 받았다. 합성구조물의 설계지침서는 합성바닥판, 합성거더와 합성기둥으로 나누어져있으며, 이번에 소개한 부분은 그중 일부분인 합성바닥판의 강판과 철근콘크리트를 적당한 전단연결재로 결합한 합성바닥판의 설계부분이다.