• Journal of the Korean Geotechnical Society
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• v.27 no.11
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• pp.47-54
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• 2011

In this paper, longitudinal behaviors of a tunnel with respect to various conditions are analyzed, and a new equation of longitudinal deformation curve during tunnel expansion is proposed. Finally, the range of protection by a protector is investigated using the proposed equation. To achieve the objectives, numerical analysis according to the ground and expansion conditions is performed. The results show that the range of protection, when a 2 traffic lane tunnel is expanded to 4 traffic lanes, should cover at least 24m to backward and 35m forward.

• Tunnel and Underground Space
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• v.18 no.5
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• pp.338-342
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• 2008

Longitudinal deformation profile(LDP) has been obtained mostly by numerical analysis. In this study, LDP was plotted by measured data from horizontal inclinometer and crown settlement. Deformation of foe ahead was determined by comparing to the maximum deformation point and deformation of after excavation was determined by regression of the measured crown settlement data. The result shows that crown deformation began as f3r as 3D ahead of the face. Crown settlement at the face was 40% of ultimate deformation, which was 10% higher than numerical results, and the deformation converged after excavation of 4D.

• Journal of the Korean Geographical Society
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• v.49 no.3
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• pp.339-356
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• 2014

Easy access to DEMs and the development of technology treating DEMs make it easier to extract stream longitudinal profiles from DEMs than previously done. Since such profiles possess many problems such as artificial flats and steps, it should be required for them to be smoothed like natural profiles to estimate gradient values along those sections. However smoothing itself comes with much distortion of raw profile from original DEMs. There has been no research evaluating quantitatively the effects due to smoothing process. Here we attempt to quantify the effects of major smoothing methods on raw and real profiles, suggest a new method to overcome the limitations of them, and evaluate it. This study not only suggests a new smoothing method, but also provides a guideline for choosing a proper smoothing method.

• 한국도로학회:학술대회논문집
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• 2004.10a
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• pp.279-284
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• 2004

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1996.06a
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• pp.286-290
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• 1996

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.7 no.2
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• pp.157-166
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• 1996

This paper presents the optimum termination method of a TEM Cell, which utilizes hybrid distributed termination resistor array networks. Current stream on the septum, and on the terminal end of a TEM Cell is analyzed by numerical analysis. By circuit analysis, the optimum resistor array network is designed based on the result of the analysis, which assures efficient power dissipation, and current stream traveling straight and uniform. Thermovision photos were taken for comparing the conventional termination network on which each resistor is arranged at regular intervals, with the suggested optimum termination network on which each resistor is arranged for current distribution. The comparison of the results of thermovision photos shows a good agreement with those obtained by numerical analysis.

• International Journal of Highway Engineering
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• v.4 no.2 s.12
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• pp.9-18
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• 2002

The main distresses that influence pavement performance are rutting, fatigue cracking, and longitudinal roughness. Thus, it is important to analyze the factors that affect these three distresses, and to develop prediction models. In this paper, three distress prediction models were developed using DataPave program which stores data from a wide variety of pavement sections In the United States. Also, sensitivity studies were conducted to evaluate how the input variables impact on the distresses. The result of sensitivity study for the prediction model of rutting showed that asphalt content, air void, and optimum moisture content of subgrade were the major factors that affect rutting. The output of sensitivity study for the prediction model of fatigue cracking revealed that asphalt consistency, asphalt content, and air void were the most influential variables. The prediction model of longitudinal roughness indicated asphalt consistency, #200 passing percent of subgrade aggregate, and asphalt content were the factors that affect longitudinal roughness.

• Proceedings of the Korea Water Resources Association Conference
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• 1988.07a
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• pp.45-54
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• 1988

현지해안의 해빈변형을 연구하기 위해 해운대 해수욕장에서 파랑과 해빈류를 관측하였으며, 또한 파랑과 흐름의 간섭효과를 고려한 파랑변형 및 해빈류를 수치계산하여 관측결과와 비교하였다. 지형변동은 경험적 고유함수법에 의해 해석했다. 해운대 해수욕장의 해빈변형을 해빈류의 유황과 지형변동의 해석결과에 의해 분석하였다. 남서풍이 탁월할 때는 종단방향의 표사이동에 의해 침식이 일어났으며, 이 때의 표사이동 양상은 입사각이 180。일 때의 해빈류의 유황과 거의 일치하였다. 북동풍이 탁월할 때는 연안방향의 표사이동에 의해 침식이 일어났으며, 이 때의 표사이동 양상은 입사각이 160。일 때의 해빈류의 유황과 거의 일치하였다. 즉, 현지의 해빈변형은 입사파의 특성과 파랑에 의해 일어나는 해빈류에 의해 크게 좌우되는 것으로 나타났다.

• 한국도로학회:학술대회논문집
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• 2006.10a
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• pp.473-478
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• 2006

• Proceedings of the KAIS Fall Conference
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• 2011.05a
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• pp.251-254
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• 2011

본 논문에서는 예약주소를 사용한 HMIPv6로 각 통신 노드에 따른 그룹 군집화와 MIH 패킷의 Service Specific TLVs의 변형을 통해 기존의 핸드오버에서 좀 더 가볍고 빠른 Searching과 효율적인 인증을 이룰 수 있도록 하였다. 군집(Aggregate) 세션 단위로 자원예약을 하는 경우 종단간 SID(Session ID)와는 별도로 군집 SID를 사용하는데 MIH의 Service Specific TLVs를 통해 터널링을 이루고 변형된 Service Specific 공간을 통한 효율적인 핸드오버를 지원한다.