• Proceedings of the Korea Information Processing Society Conference
• /
• 2010.11a
• /
• pp.1632-1634
• /
• 2010

고성능 재구성형 어레이 아키텍처는 애플리케이션에 내재된 병렬성을 충분히 활용하도록 풍부한 하드웨어 리소스로 구성되어 있다. 이러한 하드웨어 리소스는 소프트웨어 파이프라이닝 기반 코드할당 기법을 통하여 사용된다. 이러한 코드할당 기법은 기존의 소프트웨어 파이프라이닝 기법에 FPGA 에서의 라우팅 & 위치선정기법이 연결된 형식으로 구성된다. 이러한 기존의 연구들은 데이터 흐름 (data flow)을 단순한 형태로 가정하여 개발되었다. 따라서 루프 코드 펼침 (loop unrolling)에 따라서 발생되는 데이터 복사에 의한 흐름 (copy flow)은 코드 매핑할 때 고려하지 않기 때문에 소프트웨어 파이프라이닝 적용시 네트웍 리소스의 중복사용으로 인한 데이터 충돌문제(data congestion)로 Minimum Initiation Interval (MII)증가에 따르는 성능 저하가 발생할 수 있다. 본 연구에서는 다양한 데이터 복사 흐름까지 고려하도록 데이터 의존도 그래프 (Data Dependence Graph, DDG)를 확장하여 스케쥴링 단계에서 데이터 충돌 지연에 의한 MII 증가를 방지하여 최적의 시스템 성능을 얻도록 코드 할당 기법을 개발하였다.

• Journal of Korean Tunnelling and Underground Space Association
• /
• v.25 no.5
• /
• pp.345-355
• /
• 2023

An analysis of covariance and Pearson correlation coefficient were performed to identify the relationship between both variables: traffic volume and crack. For this, it was carried out to analyse 216 tunnel inspection/diagnosis results with respect to the traffic. As a result, it has been proven that traffic volume and cracks in concrete linings are highly correlated. Therefore, it is recommended to consider traffic volume in planning of preemptive maintenance such as crack repair, etc.

• Journal of Korean Tunnelling and Underground Space Association
• /
• v.10 no.4
• /
• pp.329-336
• /
• 2008

Efficient traffic network is required in urban area for good living condition. However, dense traffic network creates traffic jam and gives bad influences to the ground environment. Therefore, advanced use of underground and tunnel is required. But, in the last 20 years many tunnel fire accidents have occurred all over the world. Increase of tunnels and increase of traffics result in increase of tunnel fire. Tunnel fire creates damage to people and to the tunnel structure. Also, tunnel fire creates a big economical loss. In a mountain tunnel, the stability of the tunnel will not be disturbed by fire although the tunnel lining will get a severe damage. However, in a shield tunnel or immersed tube tunnel, cut and cover tunnel, there is a high possibility that tunnel itself will collapse by fire because their tunnel concrete lining is designed as a structural member. The aim of this experimental research is to verify the fire protection performance of newly developed cementitious material compared with the broadly used existing products in Europe and Japan. For the experiments, the general NATM tunnel concrete linings with the newly developed material were tested using fire loading curve of RABT (Maximum peak temperature is $1,200^{\circ}C$) and RWS (Maximum peak temperature is $1,350^{\circ}C$). From the test results, the newly developed fire protection material applied with 30 mm thickness showed good fire-proofing performance under RABT fire loading.

• Journal of Korean Tunnelling and Underground Space Association
• /
• v.9 no.1
• /
• pp.37-47
• /
• 2007

The shield tunneling method has been increasingly employed to minimize environmental damages and civil complaints in the populated and developed area. A lining segment, which is a main structure of the shield tunnel, consists of joints. Conventional foreign and domestic design data have been commonly used for design practices without a specific verification of structural analysis models, design load, and the effect of soil characteristics on the performance of lining segment. In this study, the suitability of existing analytic models used for the design of shield tunnel lining segment has been evaluated through a comparison between analytical and numerical solutions. Based on the evaluation of their suitability performed in the study, a full-circumferential beam jointed spring model (1R-S0) is proposed for design practices by considering user's convenience, the applicability of field conditions and the accuracy of analysis result. By using the proposed model, the parameter analysis was performed to investigate the effects of joint stiffness, ground rigidity, joint distribution and the number of joints on the behavior of lining segment. Parameters considered in the investigation have been appeared to affect the behavior of lining segment. Among those parameters, joint stiffness has been appeared to have the most significant effect on the bending moment and displacement of lining segment.

• Tunnel and Underground Space
• /
• v.9 no.1
• /
• pp.48-55
• /
• 1999

One of the major roles of concrete lining is the supplementary support of ground load. Therefore, if there are cracks or deformation found in the lining, the causes should be carefully examined. Tunnel Soundness Evaluation System (DW-TSES) was developed to meet such requirements. Main facility of the system was intended to find the probable causes on the basis of the apparent changes in lining and the environmental conditions. It also includes facilities for evaluating the soundness of a tunnel and indicating the method for repair or reinforcement. The characteristic feature of damages is used for reasoning in case of deterioration and leakage, and artificial neural network is used in external pressure. This process depends on the results of the case analyses and FDM, which have a collection of the typical features of different types of damages as well as the unusual changes caused by the external pressure. The comparison of the outputs of this system with those of expert's diagnoses draws the following conclusions. 1) Artificial neural network was a suitable tool to find to causes of damages by external pressure. 2) The environmental conditions improved the accuracy in reasoning. 3) The result of finding causes and evaluating soundness was helpful to suggest effective methods concerning tunnel maintenance.

• Journal of Korean Tunnelling and Underground Space Association
• /
• v.23 no.5
• /
• pp.303-314
• /
• 2021

With the high quality/high stiffness/high strength of segment lining, segment lining is increasingly used as the final lining of the tunnel. Precast concrete lining has higher quality and strength than field concrete. Paradoxically, this contributes to greater damage to concrete in the event of a fire in a tunnel. In this study, tests were conducted to determine the fire resistance performance of segment linings according to fiber content in fire resistance methods using synthetic fibers such as PP fibers. As a result, it was confirmed that fire resistance performance required by the relevant project can be secured when using 1.5 kg/m³ of PP fiber. In addition, comparison of the results of PP fibers with PET, a similar synthetic fiber, showed better fire resistance performance than when PP fibers were used.

• Proceedings of the KSR Conference
• /
• 2000.11a
• /
• pp.219-225
• /
• 2000

This study is to develop a Fe-based disc brake lining with sponge structure for rolling stock of 150km/h train and to concept design with 3 groove type for brake disc reducing hot hair-crack and certainly friction coefficient. The developing brake lining would be to presumption of saving 300 million won during one year

• Proceedings of the Korean Society for Rock Mechanics Conference
• /
• 1999.03a
• /
• pp.9-15
• /
• 1999

말레이지아 보르네오섬 사라왁주의 바군 가배수로 터널(약칭 "바쿤터널")은 본 댐 공사를 수행하기 위한 배수 터널로 터널의 완공시기는 바쿤 수력발전사업의 중요한 요인이다. 터널의 라이닝작업은 터널공사의 완료 단계로 공사비와 공기 면에서 굴착 및 지보작업과 같이 중요한 단계이다. 바쿤터널은 내부 직경 12 m의 유사연장 3개의 터널로 이루어져 있으며 총길이는 4314.6 m 이다. 내공 단면은 배수시 마찰을 감소시키기 위하여 원형단면으로 설계되었다. (중략)계되었다. (중략)

• Proceedings of the KAIS Fall Conference
• /
• 2006.05a
• /
• pp.577-579
• /
• 2006

본 논문에서는 불연속면과 터널라이닝과의 교차부에 대한 효과적인 지반공학적 검토를 위하여 불연속면의 경사를 고려할 수 있는 3차원 수치해석을 수행하였다. 불연속면이 존재하는 경우, 콘크리트 라이닝에 발생하는 휨압축응력이 불연속면을 주변을 따라 불연속면이 없는 경우에 비해 상대적으로 크게 나타났으며 이는 불연속면의 존재로 인한 응력집중현상에 기인한다. 최대휨압축응력은 측압계수와 함께 증가하였으며, 불연속면을 고려하였을 경우 그 증가폭이 확대되었다.

• 수도
• /
• s.38
• /
• pp.25-31
• /
• 1987