• 기록학연구
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• 제50호
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• pp.389-423
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• 2016

이 논문은 2009년 제정된 일본의 "공문서등의 관리에 관한 법률"의 영향으로 새롭게 변화하고 있는 지방 기록관리의 모습을 도도부현과 정령지정도시의 사례 연구 방식을 통해서 구체적으로 포착하고자 하였다. 일본 지방자치체에서의 기록관리는 지금까지 기록관리에 관한 기본법이 존재하지 않았던 상황에서 행정기관 내부의 '문서관리규정'에 근거하여 이루어졌다. 법 제정을 계기로 지방에서도 '법률의 취지'를 반영한 '적정한 기록관리'를 실현하기 위한 기록관리 법령 정비와 아카이브 정비가 추진되었다. 지방마다 처한 조건으로 인해 그 내용과 수준에서 차이를 보이지만, 기록관리 조례의 제정을 통해서 법에서 규정한 '현용과 비현용을 아우르는 일원적인 기록관리체계'를 도입하고 있으며, 이 과정에서 지방아카이브의 기록관리에 관한 권한과 기능의 강화 확대를 꾀하였다. 또한 기록물처리일정표와 기록목록의 공표, 제3자적 관점 확보 위한 공문서관리위원회의 운영 등을 통해 조례에서 정한 기록관리 내용의 법적 준수를 철저하게 지킨다. 이러한 일본의 지방자치체의 변화는 행정기관의 기록이 주민공유의 지적재산이라는 점과 이를 적정하게 관리하여 주민에 대한 설명책임을 달성하려는 공문서관리법의 취지를 충실하게 반영한 것이다.

• 한국인터넷방송통신학회논문지
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• 제8권3호
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• pp.15-23
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• 2008

본 논문에서는 유비쿼터스 지능공간의 구현을 위해 CIB 프레임워크를 제안한다. 유비쿼터스 지능공간에서 유비쿼터스 모바일 디바이스는 주변 상황을 스스로 인지, 판단하여 서비스를 제공한다. CIB 프레임워크에서 유비쿼터스 모바일 디바이스는 리소스 및 정보의 효율적인 관리를 위해 RDF 형태의 저장방식을 가진다. 이 저장공간은 새로운 정보의 추가, 수정, 삭제에 유연하며, SPARQL을 이용하여 질의에 응답한다. 또한 주변 유비쿼터스 모바일 디바이스에 내부정보를 XML 형태로 제공하며, 외부에서 수집된 정보를 자신의 디바이스에 맞게 변환하여 저장하는 기능도 제공한다.

• 대한교통학회:학술대회논문집
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• 대한교통학회 1999년도 제36회 학술발표회논문집
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• pp.47-52
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• 1999

The methods currently in use to evaluate traffic impacts on the transportation network involve some fundamental shortcomings. First, the methodss do not properly take into account regional and local traffic impacts on the transportation network simultaneously. Second, temporal distribution of traffic, a major contributor to transportation problems, is not accurately accounted for. Third, traffic impact studies require costly and labor-intensive efforts to collect necessary data and to establish to collect necessary data and to establish traffic impact models. In this research, a new method called AMIS is developed for congestion management, access control, and impact simulation to overcome the shortcomings involved in the current methods. The new method is designed for a variety of scenarios such as access management strategies, land use policies, traffic impacts, and other congestion management strategies. This method can effectively be used, with little modification, anywhere in the United States. It is an improvement over the current traffic impact simulation methods that produces more reliable and accurate traffic impact estimates. The case studies conducted in this research have offered evidence that the new method, AMIS, is a credible congestion management tool. Most importantly, a case study presented in this paper illustrates how the new method can be used not only to estimate regional and local impacts of alternate supply management policies in the course of a day, but virtually on an hour-by-hour basis.

• 한국대기환경학회지
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• 제19권6호
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• pp.757-772
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• 2003

We simulate the geographical effects on the onset time of sea breeze at Suyoung and Haeundae districts by using the LCM (Local Circulation Model). The following can be found out from the numerical simulation on Case I (real terrain) which considered the real geography of Busan metropolitan area. Especially, as a result of analyzing the land breeze path, it could be found along the coastline as it flows out through low land coastal area. To find out more about the effects of terrain and geography on the onset time of sea breeze, the results of numerical simulation of virtual geography are as follows. In Case II (flat terrain), to find out how the terrain slope affects the onset of sea breeze, flat land and the ocean was considered. As a result, convergence of nighttime air mass at a Suyoung area and nighttime strong wind speed phenomenon was not shown. In Case III (modified flat terrain), to find out the effects of the irregularity of coastline affecting the onset of sea breeze, numerical simulation was carried out by simplifying the complex coastline into segments of straight coastline. So land breeze system and changing process of sea breeze after sunrise at Suyoung and Haeundae was simulated almost in a similar manner. Through this we could find the effects of coastal irregularities on onset of sea breeze.

• Bulletin of the Korean Chemical Society
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• 제28권3호
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• pp.397-402
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• 2007

Restenosis after percutaneous coronary intervention (PCI) continues to be a serious problem in clinical cardiology. To solve this problem, drug eluting stents (DES) with antiproliferative agents have been developed. Variable local drug delivery systems in the context of stenting require the development of stent manufacture, drug pharmacology and coating technology. We have worked on a system that integrates electrophoretic deposition (EPD) technology with the polymeric nanoparticles in DES for local drug delivery and a controlled release system. The surface morphology and drug loading amount of DES by EPD have been investigated under different operational conditions, such as operation time, voltage and the composition of media. We prepared poly-D,L-lactide-co-glycolic acid (PLGA) nanoparticles embedded with curcumin, which was done by a modified spontaneous emulsification method and used polyacrylic acid (PAA) as a surfactant because its carboxylic group contribute negative charge to the surface of CPNPs (?53.5 ± 5.8 mV). In the process of ‘trial and error' endeavors, we found that it is easy to control the drug loading amount deposited onto the stent while keeping uniform surface morphology. Accordingly, stent coating by EPD has a wide application to the modification of DES using various kinds of nanoparticles and drugs.

• Advances in concrete construction
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• 제9권4호
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• pp.423-435
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• 2020

Open ground story (OGS) reinforced concrete (RC) buildings are vulnerable to the complete collapse or severe damages under seismic actions. This study investigates the effectiveness of four different strengthening techniques representing the local and global modifications to improve the seismic performance of a non-ductile RC OGS frame. Steel caging and concrete jacketing methods of column strengthening are considered as the local modification techniques, whereas steel bracing and RC shear wall systems are selected as the global strengthening techniques in this study. Performance-based plastic design (PBPD) approach relying on energy-balance concept has been adopted to determine the required design force demand on the strengthening elements. Nonlinear static and dynamic analyses are carried out on the numerical models of study frames to assess the effectiveness of selected strengthening techniques in improving the seismic performance of OGS frame.. Strengthening techniques based on steel braces and RC shear wall significantly reduced the peak interstory drift response of the OGS frame. However, the peak floor acceleration of these strengthened frames is amplified by more than 2.5 times as compared to that of unstrengthened frame. Steel caging technique of column strengthening resulted in a reasonable reduction in the peak interstory drift response without substantial amplification in peak floor acceleration of the OSG frame.

• 대한기계학회논문집A
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• 제33권8호
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• pp.842-848
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• 2009

Fatigue failures are often occurred at welded joints where stress concentrations are relatively high due to the joint geometry. Although employing good detail design practices by upgrading the welded detail class enables to improve the fatigue performance, in many cases, the modification of the detail may not be practicable. As an alternative, the fatigue life extension techniques that reduce the severity of the stress concentration at the weld toe region, remove imperfections and introduce local compressive welding residual stress, have been applied. These techniques are also used as definite measures to extend the fatigue life of critical welds that have failed prematurely and have been repaired. In this study, a hammer peening procedure for using commercial pneumatic chipping hammer was developed, and the effectiveness is quantitatively evaluated. The pneumatic hammer peening makes it possible to give the weld not only a favorable shape reducing the local stress concentration, but also a beneficial compressive residual stress into material surface. In the fatigue life calculation of non-load carrying cruciform specimen treated by the pneumatic hammer peening, the life was lengthened about ten times at a stress range of 240MPa, and fatigue limit increased over 65% for the as-welded specimen.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 추계학술대회
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• pp.77-78
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• 2015

1차원 바코드의 판독을 위한 영상처리 과정에서 이진화는 필수적인 요소이다. Niblack과 같은 지역 임계값 방식은 바코드의 이진화에 적합한 방식이지만, 연산량이 많고 속도가 느리다는 단점이 있다. 또한 영상의 화질이 좋지 않을 경우 그 결과가 부정확하다. 본 논문에서는 이러한 문제점을 개선하기 위해 1차원 바코드의 이진화 영상 생성을 위해 평균 영상을 활용하여 기존 국부 이진화의 속도 개선을 위한 알고리즘을 제안한다. 또한 이진화 영상의 화질 개선을 위한 1차원 바코드에 적합한 고주파 필터 적용을 제안한다.

• 한국재료학회지
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• 제16권11호
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• pp.668-675
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• 2006

In the partial squeeze casting process, the filling behavior of liquid metal and solidification pattern in thick area have significant influence on the quality of casting products and die life. For the optimal casting design of automobile transmission gear housing, various analyses were performed in this study by using computer simulation code, MAGMAsoft and the simulation results were compared and analyzed with experimental results. By air pressure criteria, internal porosities caused by air entrap during the mold filling were predicted and reduced remarkably by modification of gating system. Also, optimal squeeze-time lag to apply partial squeeze pin in thick area was calculated and the castings was free from shrinkage defects with the result of solidification analysis. Consequently, casting design for automobile transmission gear housing was optimized and approved by Computer Tomography.

• Structural Engineering and Mechanics
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• 제13권2호
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• pp.135-154
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• 2002

This paper presents the convected material frame approach to study the nonlinear behavior of inelastic frame structures. The convected material frame approach is a modification of the co-rotational approximation by incorporating an adaptive convected material frame in the basic definition of the displacement vector and strain tensor. In the formulation, each discrete element is associated with a local coordinate system that rotates and translates with the element. For each load increment, the corresponding strain-displacement and nodal force-stress relationships are defined in the updated local coordinates, and based on the updated element geometry. The rigid body motion and deformation displacements are decoupled for each increment. This modified approach incorporates the geometrical nonlinearities through the continuous updating of the material frame geometry. A generalized nonlinear function is used to derive the inelastic constitutive relation and the kinematic hardening is considered. The equation of motion is integrated by an explicit procedure and it involves only vector assemblage and vector storage in the analysis by assuming a lumped mass matrix of diagonal form. Several numerical examples are demonstrated in close agreement with the solutions obtained by the ANSYS code. Numerical studies show that the proposed approach is capable of investigating large deflection of inelastic planar structures and providing an excellent numerical performance.