• 한국HCI학회:학술대회논문집
• /
• 2009.02a
• /
• pp.27-33
• /
• 2009

We propose an efficient method for single image motion deblurring using edge prediction. Previous methods for motion deblurring from a single image have been based on total variation or natural image statistics. In contrast, our method predicts sharp edges by applying bilateral and shock filters and manipulating image gradients directly, and estimates motion blur using the predicted sharp edges. Sharp edge prediction makes our method possible to deblur efficiently with less computation. Results show that our method can effectively and efficiently restore images degraded by large complex motion blur.

• Proceedings of the KIEE Conference
• /
• 2008.09a
• /
• pp.58-60
• /
• 2008

발전소에서 만들어진 전력을 소비자까지 수송하는 송변전변 및 배전설비를 주 대상으로 하는 전력계통 설비의 운영에는 전력의 수송과 이를 위해 설치되는 각종 기자재로부터 인체 및 재산의 안전을 확보하기 위해 많은 종류의 절연재를 사용하고 있다. 지금까지 전력분야에서 사용되어 온 절연재는 자기재(porcelain)가 주종을 이루어 왔으나 재료기술의 발달과 함께 폴리머 절연재료들이 속속 개발되면서 자기재에 비해 가격 및 시공성 등에서 이점이 많은 폴리머 절연재가 자기재를 대체하고 있다. 그러나 폴리머 절연재료는 기들의 재질 및 사용 환경 등에 따라 일정 수명을 가지는 것으로 나타나 수명종기에 이르면 폐기물로 배출되게 된다. 전력산업 중 배전분야에서는 2007년 구매한 기자재를 기준으로 연간 13만연 톤의 전력폐기물이 발생될것으로 예측되었으며 이들은 PE, XLPE, FRP, PVC, EPDM, Silicone 등 유기성분이 약 40%, Cu, Al, 철 등 금속과 무기성분이 약 60% 인 것으로 조사되었다. 그러나 전선 및 케이블류를 제외한 기자재를 대상으로 한 분석에서는 유기성분의 함량이 90%에 이르며 이들은 석유화학공업의 원료로부터 만들어지는 특성상 높은 에너지를 함유하는 것으로 나타난 바, 이들을 적정하게 처리하는 방안의 확보는 폐기물의 처리 외에 폐기물로부터 에너지를 회수하여 자원화하는 것이 가능한 것으로 보여진다.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.21 no.3
• /
• pp.113-125
• /
• 2013

This study analyzes upper arm as the part of suspension through the structural analyses of fatigue. Maximum displacement is shown at the knuckle joint connected with the bracket of automotive body. Among the cases of nonuniform fatigue loads, 'SAE bracket history' with the severest change of load becomes most unstable but 'Sample history' becomes most stable. Maximum life at 'Sample history' or 'SAE transmission' can be shown with 60 or 3.5 times more than 'SAE bracket history' respectively. In case of 'Sample history' with the average stress of $-4{\times}10^4$ to $4{\times}10^4$ MPa and the amplitude stress 0 to $8{\times}10^4$ MPa, the possibility of maximum damage becomes 3%. This stress state can be shown with 5 or 6 times more than the damage possibility of 'SAE Bracket history' or 'SAE transmission'. This study result is applied with the design of upper arm and it can be useful at predicting prevention and durability against its damage.

• Journal of Welding and Joining
• /
• v.8 no.4
• /
• pp.46-57
• /
• 1990

TMCP steel manufactured by controlled rolling followed by accelerated cooling process is known to have extra-ordinary mechanical properties such as tensile strength and toughness. However, there is much uncertainty about the fatigue fracture characteristics, especially, in the welded state of this steel. In case of this steel, the softening zone by welding is generated in heat affected zone in contrast with the case of conventional normalized high strength steel. This softening zone is considered to play significant roles in low cycle fatigue fracture of the welded part of this steel. In this paper, the low cycle fatigue behaviors of TMCP steel were inspected in as-received and welded state using the smooth specimen. The fatigue life-time was seperately investigated on the basis of failure of the specimen and crack initiation which is detected by differential strain method. Moreover, the low cycle fatigue characteristics of TMCP steel were quantitatively compared with those of the conventional normalized steel of same strength level.

• Journal of the Korean Society of Manufacturing Process Engineers
• /
• v.11 no.3
• /
• pp.122-129
• /
• 2012

This study investigates structural and vibration analyses according to the thickness of bicycle frame tube. The model of bicycle frame has the dimension as length of 862mm, width of 100mm and hight of 402.5mm. There are 3 kinds of models with tubes of top, down and seat at bicycle frame as thicknesses of 10, 15 and 20mm. The maximum displacement and stress occur at the center part of seat stay and at the installation part of rear wheel respectively. Maximum displacements become 0.031936, 0.029159 and 0.027984mm in cases of thicknesses of 10, 15 and 20mm respectively. In case of thickness of 20mm among 3 cases, maximum displacement becomes lowest. But maximum stresses become 10.019, 8.5492 and 9.2511MPa in cases of thicknesses of 10, 15 and 20mm respectively. In case of thickness of 15mm among 3 cases, maximum stress becomes lowest. There is no resonance at practical driving conditions and natural frequency remains almost unchanged along the change of thickness. In case of the displacement due to vibration mode, the displacement difference at thickness between 15mm and 20mm becomes 1/2 times than that between 10mm and 15mm. Design at bicycle frame tube becomes most economical and durable effectively in case of thickness of 15mm among 3 cases.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.33 no.11
• /
• pp.1187-1194
• /
• 2009

During the last decade, possibility of flaw occurrences has been rapidly increased world-widely as the increase of operating times of petro-chemical facilities. For instance, from a recent in-service inspection, three different sized surface cracks were detected in welding parts of a spherical oxygen holder in Korea. While API579 code provides corresponding engineering assessment procedures to determine crack driving forces, in the present work, numerical analyses are carried out for the cracked oxygen holder to investigate effects of complex geometry, analysis model and residual stress. With regard to the detailed finite element analysis, stress intensity factors are determined from both the full three-dimensional model and equivalent plate model. Also, as an alternative, stress intensity factors are calculated for equivalent plate model by employing the noted influence stress function technique. Finally, parametric structural integrity evaluation of the cracked oxygen holder is conducted in use of failure assessment diagram method, J/T method and DPFAD method. Effects of the geometry and so forth are examined and key findings from the simulations are fully discussed, which enables to determine practical safety margins of spherical components containing a defect.

• Journal of Korean Society of societal Security
• /
• v.2 no.4
• /
• pp.75-81
• /
• 2009

This paper presents the geotechnical characteristics of tunnel co \l apse based on the case studies. For domestic cases, most collapses are likely to happen along the weakest zone of shear strength due to the change of stresses induced by excavation specially when soft or weathered rock exist in front of a tunnel. In other words, the collapse of a tunnel occurs along the highly weathered fractured zone due to blasting and excavation. In Europe, collapses have been occurred by one joint group even though the ground is relatively fresh and for the rocks of which RQD is over 50%. In addition, the amount of ground water flow does not seem to be seriously affected by the RQD range.

• Journal of the Korean Geotechnical Society
• /
• v.19 no.4
• /
• pp.277-286
• /
• 2003

A constitutive equation was implemented in order to model the behavior in overall ranges from small to large strains, which is based on anisotropic hardening rule and total stress concept. The constitutive model was implemented in ABAQUS code in which large deformation analysis can be performed accurately and efficiently. The formulation includes (1) finite strain plasticity on the basis of Jaumann stress rate, (2) implicit stress integration and (3) consistent tangent moduli. A large deformation analysis was performed with the constitutive model using ABAQUS program. In the analysis of an actual embankment, it was found that the proposed model was formulated accurately and efficiently.

• Journal of Korean Medical classics
• /
• v.20 no.4
• /
• pp.65-79
• /
• 2007

재한의학적착자상상견적"의자의야"저개어구(在한의學的着者上常見的"의者意也"저개語句), 파의학이론적신비성(把의學理論的神秘性), 치료방법적영활성(治료方法的영活性), 의가적오성간주'의'(의家的悟性看做'意'). 환구화래설(換句話래說), 한의학적운치포괄"가이의회(한의學的운致包括"可以意회), 난우언전"적감각(難于言전"的感覺). 수연의학기자연과학우실용기술(수然의學旣自然科學又실用技술), 환미비소우의가이'의'여하구축학문적연구(환未비소于의家以'意'如何구筑學問的硏究). 여금종각개각도평가전통과학기술화문화적시후(如今종各개角度評가전統科學技술和文化的시候), 서방과학기술재지구상번성이보급이후(西方科學技술在地球上繁盛而普及以后), 유일한의학잉연유불쇠퇴적생명력(唯一한의學仍然有不衰退的生命力), 저취시양인문표시경희(저就是양人們表示倞喜). 여차동시인문안조서방과학적시각화표준(여此同시人們按照西方科學的시角和표准), 파유일지탱생명력적한의학부단지관찰(把唯一支撑生命力的한의學不단地관察), 검사(檢査), 평가(評價), 요구(要求), 개조(改造). 저양적정황하(저양的情況下), 대표착"의자의야"적한의학불유득수도료허다견책(代表着"의者意也"的한의學不由得受到了許多遣責). 대우연구한의학래설(대于硏究한의學래說), 응해소주여하이해고대의가전래적저구화(應該소注如何理解古代의家전래的구句和). 통과요육군적연구등(通과寥育群的硏究等), 논자요분석이정리(論者要分析而整理), 매시기"의자의야"적다양포함화표연형식(每時基"의者意也"的多양包含和表演形式).

• Journal of Welding and Joining
• /
• v.12 no.1
• /
• pp.73-79
• /
• 1994

Low cycle fatigue test was performed by companion specimens method to compare the properties of cyclic strain for the weldments of controlled rolling steel CR60 and welding structural steel SM58Q. And the result does not showed any difference of low cycle fatigue life between weldments. Especially, the values of coefficient of cyclic plastic strain $C_{p}$ and exponent of cyclic plastic strain $K_{p}$ of heat affected zones of CR60 steel and SM58Q steel were same. And $C_{p}$ and $K_{p}$ of CR60 steel were equal to the values of weld it means a good combination between the base metal, the heat affected zone and the weld of CR60 steel.eel.eel.