• 한국측량학회지
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• 제21권1호
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• pp.45-51
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• 2003

제천지역의 다양한도시의 형태를 입체적으로 조망해 볼 수 있도록 하기 위하여 입체 지형조감도를 작성하였고, 이를 시공간에서 동영상으로 보여주기 위하여 3차원 시뮬레이션을 실시할 수 있도록 하였다. 입체 조감도의 제작은 투시기법을 이용한 이미지 제작 기법을 이용하였으며, 그 기본재료가 되는 영상들은 다음과 같이 준비하도록 하였다. 준비영상으로는 우리나라 아리랑 위성의 EOC 영상을 이용하도록 하였으며, 국립지리원에서 국가기본도로 제작한 1/5,000 수치지도의 등고선으로부터 추출하여 임의로 오차가 보정된 DEM 생성과 1/1,000 수지지도의 도로 래이어 벡터 파일로 제작된 도로선을 분류하여 대상지의 3차원 영상위에 중첩시켜 처리하는 것으로 하였다. 특히 이번 연구에 사용한 도심지역의 도로망 구성 데이터는 새주소 부여를 위해 제작된 1/1,000축척의 간선도로를 최대한 이용함으로서 새주소에서 사용하게 될 주소체계와의 연계성을 크게 염두에 두어 제작하도록 연구하였다.

• 산업경영시스템학회지
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• 제36권4호
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• pp.18-24
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• 2013

A document control system (DCS), ANSIM (KAERI Advanced Nuclear Safety Information Management) was designed for the purpose of documents preparation, review, and approvement for JRTR (Jordan Research and Training Reactor) project. The ANSIM system consists of a document management, document container, project management, organization management, and EPC (Engineering, Procurement and Construction) document folder. The document container folder run after specific contents, a revision history of the design documents and drawings are issued in KAERI. The EPC document work-scope is a registry for incoming documents in ANSIM, the assignment of a manager or charger, document review, preparing and outgoing PM memorandum as attached the reviewed paper. On the other hand, KAERI is aiming another extra network server for the NRR (New Research Reactor) by the end of this year. In conclusion, it is the first, computation system of DCS that provides document form, document number, and approval line. Second, ANSIM increases the productivity of performance that can be recognized the document work-flow of oneself and all participants. Finally, a plenty of experience and knowledge of nuclear technology can be transmitted to next generation for the design, manufacturing, testing, installation, and commissioning. Though this, ANSIM is expected to allow the export of a knowledge and information system as well as a research reactor.

• 한국지리정보학회지
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• 제8권2호
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• pp.21-30
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• 2005

본 연구는 도시지역에서 지표용도를 결정하는 요인으로서 토지이용과 식생분포를 설정하고 이들의 상호관계를 규명하는 것을 목적으로 한다. 이를 위하여 대구광역시를 사례지역으로 위성영상을 판독하고 그 결과를 수치지도와 중첩하여 분석을 실시하였다. 지표온도와 식생지수(표준식생지수)는 위성영상분석을 통하여 도출하였고 토지이용자료는 통계청이 지난 2001년 제작한 기초단위구 자료를 통하여 획득하였다. 분석결과 예상한 바와 같이 지표온도는 식생분포와 토지이용분포와 깊은 상관관계가 있는 가운데 식생상태보다는 토지이용에 의해 더욱 많은 영향을 받는 것으로 나타났다. 이에 따라 본 연구는 토지이용과 지표온도와의 관계규명에 초점을 두었다. 이를 위하여 본 연구는 18개로 구분된 토지이용을 표면온도에 따라 Duncan 검증방법으로 7-8개의 그룹으로 분류하였다. 이에 의하면 지표온도는 제조업과 관련된 토지이용이 많은 지역에서 가장 높았고, 그 뒤를 이어 도심상업지역이 높았다. 반면 농업 및 임야지역의 지표온도가 가장 낮게 나타났다.

• Structural Engineering and Mechanics
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• 제73권2호
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• pp.191-207
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• 2020

This study aims at investigating the size-dependent free vibration of porous nanoplates when exposed to hygrothermal environment and rested on Kerr foundation. Based on the modified power-law model, material properties of porous functionally graded (FG) nanoplates are supposed to change continuously along the thickness direction. The generalized nonlocal strain gradient elasticity theory incorporating three scale factors (i.e. lower- and higher-order nonlocal parameters, strain gradient length scale parameter), is employed to expand the assumption of second shear deformation theory (SSDT) for considering the small size effect on plates. The governing equations are obtained based on Hamilton's principle and then the equations are solved using an analytical method. The elastic Kerr foundation, as a highly effected foundation type, is adopted to capture the foundation effects. Three different patterns of porosity (namely, even, uneven and logarithmic-uneven porosities) are also considered to fill some gaps of porosity impact. A comparative study is given by using various structural models to show the effect of material composition, porosity distribution, temperature and moisture differences, size dependency and elastic Kerr foundation on the size-dependent free vibration of porous nanoplates. Results show a significant change in higher-order frequencies due to small scale parameters, which could be due to the size effect mechanisms. Furthermore, Porosities inside of the material properties often present a stiffness softening effect on the vibration frequency of FG nanoplates.

• Structural Engineering and Mechanics
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• 제75권3호
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• pp.369-376
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• 2020

The life of conventional steel plastic injection molds is long but manufacturing cost and time are prohibitive for using these molds for producing prototypes of products in limited numbers. Commonly used 3D printers and rapid prototyping methods are capable of directly converting the digital models of three-dimensional solid objects into solid physical parts. Depending on the 3D printer, the final product can be made from different material, such as polymer or metal. Rapid prototyping of parts with the polymeric material is typically cheaper, faster and convenient. However, the life of a polymer mold can be less than a hundred parts. Failure of a polymeric mold during the injection molding process can result in serious safety issues considering very large forces and temperatures are involved. In this study, the feasibility of the inspection of 3D printed molds with the surface response to excitation (SuRE) method was investigated. The SuRE method was originally developed for structural health monitoring and load monitoring in thin-walled plate-like structures. In this study, first, the SuRE method was used to evaluate if the variation of the strain could be monitored when loads were applied to the center of the 3D printed molds. After the successful results were obtained, the SuRE method was used to monitor the artifact (artificial damage) created at the 3D printed mold. The results showed that the SuRE method is a cost effective and robust approach for monitoring the condition of the 3D printed molds.

• 한국디지털정책학회:학술대회논문집
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• 한국디지털정책학회 2004년도 International Conference on Digital Policy & Management
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• pp.39-53
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• 2004

Data production systems are generally very large, distributed and complex systems used for creating advanced (mainly statistical) reports. Typically, data is gathered periodically and then subsequently aggregated and separated during numerous production steps. These production steps are arranged in a specific sequence (workflow or production chain), and can be located worldwide. Today, a need for improving and automating methods of supervision for data production systems has been recognized. Supervision in this context entails planning, monitoring and controlling data production. Two significant approaches are introduced here for improving this supervision. The first is a 'closely-coupledd' approach (meaning direct communication between production jobs and supervisory tool, informing the supervisory tod immediately about delays in production) - based upon traditional production planning methods typically used for manufacturing (goods) and adopted for working with data production. The second is a 'loosely-coupled' approach (meaning no direct communication between supervisory tool and production jobs is used) - having its origins in proven traditional project management. The supervisory tool just enquires continuously the progress of production. In both cases, dates, costs, resources, and system health information is made available to management. production operators and administrators to support a timely and smooth production of periodic data. Both approaches are theoretically described and compared. The main finding is that, both are useful, but in different cases. The main advantages of the closely coupled approach are the large production optimisation potential and a production overview in form of a job execution plan, whereas the loosely coupled method mainly supports unhindered job execution and offers a sophisticated production overview in form of a milestone schedule. Ideas for further research include investigation of other potential approaches and theoretical and practical comparison.

• 대한치과교정학회지
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• 제50권6호
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• pp.373-382
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• 2020

Objective: To compare computer-aided design and computer-aided manufacturing (CAD/CAM) customized nitinol retainers with standard stainless-steel fixed retainers over a 12-month study period. Methods: This randomized controlled trial (RCT) was conducted on 62 patients randomly allocated to a control group that received stainless-steel retainers or a test group that received customized CAD/CAM nickel-titanium retainers. Four time points were defined: retainer placement (T0) and 1-month (T1), 6-month (T2), and 12-month (T3) follow-up appointments. At each time point, Little's irregularity index (LII) (primary endpoint) and dental stability measurements such as intercanine width were recorded in addition to assessment of periodontal parameters. Radiological measurements such as the incisor mandibular plane angle (IMPA) were recorded at T0 and T3. Failure events (wire integrity or debonding) were assessed at each time point. Results: From T0 to T3, LII and other dental measurements showed no significant differences between the two groups. The data for periodontal parameters remained stable over the study period, except for the gingival index, which was slightly, but significantly, higher in the test group at T3 (p = 0.039). The IMPA angle showed no intergroup difference. The two groups showed no significant difference in debonding events. Conclusions: This RCT conducted over a 12-month period demonstrated no significant difference between customized CAD/CAM nickel-titanium lingual retainers and standard stainless-steel lingual retainers in terms of dental anterior stability and retainer survival. Both retainers eventually appeared to be equally effective in maintaining periodontal health.

• 대한기계학회논문집A
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• 제36권6호
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• pp.645-651
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• 2012

본 논문은 부표로봇에 부착된 카메라 영상의 흔들림을 보정하기 위하여 새로운 방법을 제안한다. 본 연구에서는 부표로봇의 각도측정에 사용하는 자이로 센서의 누적오차 및 노이즈 등의 문제를 해결하기 위해 새로운 기구 메커니즘을 영상처리와 결합한 방법을 제안한다. 이 알고리즘은 특징 점을 추출하기 위한 타깃을 제안한 기구에 부착하여 타깃의 모형 특징을 기반으로 영상을 보정하는 방법이다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.1214-1218
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• 2005

As demands for precision parts are increased, existing methods to fabricate them such as MEMS, LIGA technology have the technical limitations like high precision, high functionality and ultra miniaturization. A micro-stereolithography technology based on $DMD^{TM}$(Digital Micromirror Device) can meet these demands. In this technology, STL file is the standard format as the same of conventional rapid prototyping system, and 3D part is fabricated by stacking layers that are sliced as 2D section from STL file. Whereas in conventional method, the resin surface is cured as scanning laser beam spot according to the section shape, but in this research, we use integral process which enables to cure the resin surface at one time. In this paper, we deal with the dynamic pattern generation and $DMD^{TM}$ operation to fabricate micro structures. Firstly, we address effective slicing method of STL file, conversion to bitmap, and dynamic pattern generation. Secondly, we suggest $DMD^{TM}$ operation and optimal support manufacturing for $DMD^{TM}$ mounting. Thirdly, we examine the problems on continuous stacking layers, and their improvements in software aspects.

• 한국산학기술학회논문지
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• 제13권9호
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• pp.4171-4176
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• 2012

국내 기존선 전 구간의 폐색장치는 전자화 및 통합화가 되어있지 않아 건설과 유지보수 측면에서 많은 보완점을 가지고 있다. 현재 사용되고 있는 ABS(Automatic Block System)와 고속화 노선에 추가 설치된 ATP(Automatic Train Protection) 시스템의 LEU(Lineside Electronic Unit)는 동일한 장소에서 동일한 신호정보에 의해 열차를 제어하고 있음에도 불구하고 별개의 시스템으로 분리되어 설치되어 열차를 제어하고 있다. 따라서 현재의 ABS와 LEU에서는 램프검지부나 전원부 등과 같이 중복 설치된 부품이 많기 때문에 전체적인 제품의 제조 원가가 높아질 뿐만 아니라, 시공비 역시 2중으로 소요되고 유지보수에도 많은 인력과 비용을 투자해야 하는 등의 문제가 있다. 본 논문에서는 기존의 ABS 제어기능을 CPU에 의한 디지털 전자제어방식으로 제어할 수 있도록 하는 집중형 전자폐색제어장치의 시제품 개발과 환경시험 및 기능시험을 수행한 결과를 제시하고 있다. 이러한 집중형 전자폐색제어장치는 LEU와 통합된 형태뿐 아니라 ATP 시스템이 설치되지 않은 노선에서도 전자폐색제어장치만을 별도로 사용할 수 있도록 개발되었다.