• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.20 no.7
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• pp.620-628
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• 2010

Using the responses of deck plate, a new bridge weigh-in-motion system has been introduced. The approach includes not only a systematic algorithm for the extraction of moment influence sequence but also a sensitivity-based system identification technique. The algorithm indentifies the influence sequence, the axle loads, and axle location of moving vehicles on a bridge, simultaneously. The accuracy and practicability of the algorithm have been examined experimentally for a folded deck plate on Yongjong Grand suspension bridge. It turns out that the two-dimensional effects of the behavior of deck plate should be considered for further accuracy improvement.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.04a
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• pp.844-847
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• 2014

본 논문에서는 다양한 형태의 어플리케이션 중 스마트폰에 탑재된 카메라를 이용하여 명함을 인식할 때 발생하는 문제점을 해결하기 위한 기법을 제시하고자 한다. 스마트폰의 카메라를 이용하여 이미지를 얻을 경우 카메라의 각도에 따라 객체의 모양이 변형된다. 명함인식에서 이러한 이미지 왜곡문제는 인식률에 많은 영향을 미친다. 본 논문에서는 카메라의 각도에 따른 이미지의 왜곡 문제를 해결하기 위해 캐니 에지를 이용하여 객체를 검출하고, 검출된 객체의 간단한 정보를 이용하여 명함 영역을 검출하고, 영역 내에 명함을 검출하는 기법을 제안한다.

• Journal of Korea Multimedia Society
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• v.24 no.6
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• pp.753-759
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• 2021

During tensile test, tensile strain of tensile tester is measured by movement distance of upper zig and initial specimen's length. Conventional tensile tester program obtains the tensile strain after the end of the test, however the method is not appropriate in real time because the results are calculated until the test is finished. We suggest a real-time measurement system of tensile strain using ArUco Marker in OpenCV library. The system is designed to detect marker attached on the upper zig and calculate specimen's tensile strain. According to comparison of the calculated data and the results of the tester, errors approximately showed 0.128 mm on 3840×2160 video resolution.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.1237-1240
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• 2009

인터넷의 발달로 금융기관의 일반업무도 인터넷을 사용하여 수행되는 비중이 커짐에 따라 이를 수용하기 위한 대역폭이 확보되어야 한다. 그러나 늘어나는 트래픽을 수용하기 위한 금융권 본-지점의 통신을 위한 전용회선 등은 상대적으로 비용이 많이 들기 때문에 금융기관 본-지점간의 네트워크 구성을 위하여 물리적인 회선의 증설 대신 현재 사용중인 회선의 트래픽을 효율적으로 운영하는 등의 새로운 기법이 필요하기에 이르렀다. 이에 본 연구에서는 계속적으로 증가되고 있는 금융기관의 웹 기반의 각종 트랜잭션 트래픽을 원활하게 수용하기 위한 방안으로써 비대칭 라우팅의 개선을 통하여 영업점 네트워크 OSPF 라우팅에 대한 변형 수용으로 대역폭 Load Sharing 개선에 관한 방안을 제안하였다. 새로운 라우팅 기법을 실제환경에 적용하여 회선의 사용률이 적절하게 분산되어 사용되고 Load Sharing 성능이 향상됨을 증명하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2022.01a
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• pp.353-355
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• 2022

본 논문에서는 외력에 의해 헤어가 움직일 때, 전체가 아닌 변형률이 큰 부분에 입자 제어점을 추가하여 베지에 곡선을 그리는 적응형 헤어 시뮬레이션 기법을 제안한다. 일반적인 정규화 샘플링을 통한 물리 시뮬레이션은 헤어의 움직임에 대한 정확도가 높은 반면, 계산량이 증가하고 메모리를 많이 차지하기 때문에 비효율적이다. 이 문제는 굽힘이 일어나는 특정 부분만 활용한 적응형 샘플링을 통해 해결할 수 있으며, 메모리뿐만 아니라 속도 측면에서도 모두 우수한 성능을 보인다. 본 논문에서 제안하는 방법을 이용한 굽힘 샘플링 기법은 헤어의 굽힘 패턴에 따라 실시간으로 표현되며 자연스럽고 부드러운 실제 헤어와 유사한 결과를 보여준다.

• Journal of the Korea Institute of Building Construction
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• v.15 no.4
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• pp.359-365
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• 2015

Floor mortar experiences dry shrinkage by temperature and humidity difference of internal matrix with material type. Also, since floor mortar is influenced by environmental conditions during placing and curing period, cracks are likely to be occurred. In this study, it was evaluated the hardening and dry shrinkage properties of non-sintered binder based floor mortar utilizing alpha-hemihydrate gypsum which has expansibility in order to prevent crack of the floor mortar. It was applied to the construction site, and examined the effects of external environmental conditions on shrinkage deformation and cracking. Different types of slag accelerated initial and final setting in comparison with cement mortar and its compressive strength was satisfied standard compressive strength for floor mortar. Also shrinkage deformation behavior after the initial expansion exhibited a similar tendency with the cement mortar. From the field application result, no crack was found from slag mortar, and it is determined that the slag mortar has better dimensional stability than cement mortar caused by external environment conditions.

• Journal of the Society of Disaster Information
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• v.12 no.3
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• pp.242-248
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• 2016

This paper presents features of impermeable asphalt pavement material that uses thermoplastic GMA-based polymer(SIS, Stylene Isoprene Stylene) to improve the waterproof performance. Furthermore, as part of this study, the aerodynamic characteristics of the asphalt paving materials, using the newly suggested thermoplastic polymer, are identified through experiments. In the experiment, the aerodynamic characteristics were analyzed by testing on stability, flow values, porosity, dynamic stability, tensile strength ratio and skid resistance in accordance with KS standard and ASTM standard.

• Applied Chemistry for Engineering
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• v.30 no.5
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• pp.513-522
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• 2019

Catalysts based on organic compounds, transition metal and metal-organic frameworks (MOFs) have been applied to degrade or remove organophosphorus toxic compounds (OPs). During the last 20 years, various MOFs were designed and synthesized to suit application purposes. MOFs with $Zr_6$ based metal node and organic linker were widely used as catalysts due to their tunability for the pore size, porosity, surface area, Lewis acidic sites, and thermal stability. In this review, effect on catalytic efficiency between MOFs properties according to the structure, stability, particle size, number of connected-ligand, organic functional group, and so on will be discussed.

• International Journal of Highway Engineering
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• v.9 no.1 s.31
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• pp.1-15
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• 2007

The objective of this paper is the establishment of finite element analysis frame work for pavement research. Finite element analysis results simulating various loading experiments are verified with sensor measurements obtained from the KHC Test Road. The accuracy of the finite element analysis can be supported by these efforts so that it helps spread out the finite element analysis to pavement research and design processes. The finite element model used in this research is the full 3D nonlinear model including concrete slab, lean concrete base, subbase, shoulder, dowel, and tie-bar. In order to accomplish the accurate verification, the loading condition and the pavement temperature distribution are exactly simulated with field measured data. The curling behavior and the strain distribution are compared with measured responses from the loading tests with a truck and the FWD. Strain and curling predictions from the concrete slab are matched well with measured responses but the strain prediction from the lean concrete base is not matched with measured response. In addition, the magnitude of permanent curling is evaluated with the finite element analysis.

• Fire Science and Engineering
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• v.33 no.5
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• pp.149-154
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• 2019

The stability of firefighting pipes is crucial in the event of an earthquake. In Korea, specification-based designs are used in accordance with NFSC. However, engineering performance-based designs are used for buildings that have special requirements. For firefighting pipes, tree type pipe networks are usually utilized in buildings; however, they are characterized by several limitations. Hence, grid type and loop type networks are being utilized lately. Earthquake-resistant designs for firefighting pipes in Korea utilize NFPA 13 as the cookbook. Nevertheless, an engineering analysis is required to verify its reliability. The NFPA 13 standard used in Korea is a design method for engineers who lack earthquake engineering analysis knowledge of pipes and adapt ASCE and ASME guidelines. Earthquake resistant designs in Korea review braces only. Hence, various analyses under load conditions, such as the internal pressure of a pipe, force exerted by a continuous load, and an earthquake, are required to ensure reliability. An engineering earthquake-resistance analysis showed that tree type pipe networks are less stable than grid and loop type pipe networks. A comparison of earthquake-resistance analysis based on stress and strain revealed that strain analysis exhibited a conservative result value in the range of over-stress. Therefore, for the earthquake-resistance analysis of pipes, it is rational that engineers perform analysis to achieve the required standards through engineering analysis rather than uniform calculations, which should also be analyzed considering various analysis conditions.