• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2007년도 정기 학술대회 논문집
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• pp.170-175
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• 2007

Recently, construction industry in Korea is considering of various approaches for improving productivity and thus enhancing the competitive capacity in the global market. To this end, Korean Ministry of Construction & Transportation has launched R&D project in the field of automation, information systems, high value-added techniques. Furthermore, a new era of cities such as U-city and Eco-city is coming due to the government strategy for developing the country. In the regards of methodological development and trends of construction projects stated above, conventional methods for managing the projects is not likely to guarantee the success. Especially, in the planning and maintenance phases of such large scale cities, a new paradigm should be introduced. We thought of it as 3D object based simulation system for city planning. This paper describes the concept of the system.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2012년도 춘계학술대회 논문집
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• pp.41-42
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• 2012

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.1651-1654
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• 2003

The process equipment for handling high level radioactive materials, such as spent nuclear fuel, is operated within a sealed facility, called a hot cell, due to high radioactivity. Thus, this equipment should be maintained and repaired by remotely operated manipulator. In this study, to carry out the sale and effective maintenance of the process equipment installed in the hot cell by a servo type manipulator, a collision free motion planning method of the manipulator using virtual prototyping technology is suggested. To do this, the parts are modelled in 3-D graphics, assembled, and kinematics are assigned and the virtual workcell is implemented in the graphical environment which is the same as the real environment. The method proposed in this paper is to find the optimal path of the manipulator using the function of the collision detection in the graphic simulator. The proposed path planning method and this graphic simulator of manipulator can be effectively used in designing of the maintenance processes for the hot cell equipment and enhancing the reliability of the spent fuel management.

• 한국의학물리학회지:의학물리
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• 제15권3호
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• pp.167-172
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• 2004

지멘스(Siemens)사에서 개발된 가상미세다엽콜리메이터인 HD-270은, 전형적 다엽콜리메이터에 있어 폭의 유한성 때문에 불필요하게 발생하는 조사경계면의 요동현상을 완화시켜준다. 저자들은 이 기법을 사용했을 때의 선량분포의 변화를 확인하고, 치료계획단계에서 이를 평가해 볼 수 있도록 Pinnacle (Philips Radiation Oncology Systems, 미국) 전산화치료계획장치에 구현하였다. 그리고 임상적용에 앞서 선량학적 특성을 파악하기 위해, 가상미세다엽콜리메이터의 해상도, 조사경계면과 다엽콜리메이터가 형성하는 각도가 요동현상 및 유효반음영에 미치는 영향을 평가하였다. 또한 가상미세다엽콜리메이터 구현에 수반되는 치료테이블 움직임에 대한 위치 정확도를 평가하였다. HD-270의 임상적용을 위해 추가적으로 소요되는 치료계획과 치료 시간은 무시할 수 있음을 확인할 수 있었다.

• 한국군사과학기술학회지
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• 제20권5호
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• pp.647-653
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• 2017

In this paper, we deal with the experimental verification of 1D virtual force field algorithm based reflexive local path planning on uneven and dusty environment. The existing obstacle detection method on uneven and dusty environment and 1D virtual force field based reflexive local path planning algorithm simply are introduced. Although the 1D virtual force field algorithm is verified by various simulations, additional efforts are needed to verify this algorithm in the real-world. The introduced methods are combined with each other, installed to real mobile platforms and verified by various real experiments.

• International Journal of Precision Engineering and Manufacturing
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• 제2권3호
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• pp.69-78
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• 2001

This paper presents a process and operation planning system and an NC code post-processor for effective machining of press dies for production of cars. Based on the machining feature, major parts of press dies are categorized into 15 groups and a standard process plan is defined for each group. The standard process plan consists of a series of processes where a process is defined as a group of operations that can be done with one setup. Details such as cutting tools, cutting conditions, and tool paths are decided at the operation planning stage. At the final stage of process and operation planning, the NC code post-processor adjusts feedrates along the tool path to reduce machining time while maintaining the quality. The adjustment rule is selected based on the machining load estimated by virtual machining.

• 한국게임학회 논문지
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• 제8권1호
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• pp.79-90
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• 2008

본 논문에서는 동기 기반의 계층적 행동 계획 시스템을 제안한다. 가상 시뮬레이션 게임 환경에서 에이전트는 행동 계획 시스템을 통해 적합한 행동을 선택하게 된다. 행동 선택 시스템은 동기를 추출하고 목표를 선택하고 행동을 생성하고 최적화를 수행한다. 동기를 평가할 때 갑작스럽게 발생하거나 누적된 이벤트에 대해 계산한다. 동기를 선택할 때는 확률 분포를 사용하여 무작위로 선택한다. 계층적 목표 트리를 탐색한 후에 목표를 실행할 수 있다. 행동들을 비교한 후 가장 적합한 행동을 선택하게 된다. 선택을 할 때 안전도 값과 만족도 값을 비교하여 최적화된 행동을 선택한다. 본 연구에서 제안한 시스템을 식당경영 게임에 적용했다.

• Journal of Electrical Engineering and Technology
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• 제8권4호
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• pp.686-693
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• 2013

Generation Expansion Planning (GEP) is one of the most important decision-making activities in electric utilities. Least-cost GEP is to determine the minimum-cost capacity addition plan (i.e., the type and number of candidate plants) that meets forecasted demand within a pre specified reliability criterion over a planning horizon. In this paper, Differential Evolution (DE), and Opposition-based Differential Evolution (ODE) algorithms have been applied to the GEP problem. The original GEP problem has been modified by incorporating Virtual Mapping Procedure (VMP). The GEP problem of a synthetic test systems for 6-year, 14-year and 24-year planning horizons having five types of candidate units have been considered. The results have been compared with Dynamic Programming (DP) method. The ODE performs well and converges faster than DE.

• 대한기계학회논문집A
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• 제39권6호
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• pp.549-559
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• 2015

본 논문에서는 동적 움직임을 갖는 장애물이 위치한 주행환경에서 이동로봇의 충돌회피 기능을 포함하는 효율적인 반응경로계획 기법을 제안하고자 한다. 로봇의 동적 장애물과의 충돌회피 기능을 위해서 반응경로계획기법을 기반으로 키넥트센서를 이용한 센서융합기법의 보완을 통해서 자율주행의 강건성을 증대시키고자 하였다. 반응경로기법에서 사용된 접근방식은 동적장애물을 가상좌표평면에서 지역관측기개념을 이용하여 정적장애물로 좌표변환을 가능하게하며, 생성된 가상평면에서의 로봇과 장애물의 충돌 발생 가능한 속도와 경로의 운동학적 정보추출이 가능하게 된다. 또한 키넥트 센서 정보를 융합하여 장애물의 방향과 위치 정보를 추정하여 동적 환경에서의 주행성능의 정미도를 증대시키고자 하였다. 본 연구에서 제안 기술의 성능을 검증하기 위해서 임베디드 로봇플랫폼과 여러 개의 동적 장애물을 이용하여 시뮬레이션 해석 및 실험을 수행하였다.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제41권
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• pp.41.1-41.6
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• 2019

Backgrounds: The purpose of this study is to discuss the total joint reconstruction surgery for a patient with recurrent ankylosis in bilateral temporomandibular joints (TMJs) using three-dimensional (3D) virtual surgical planning, computer-aided manufacturing (CAD/CAM)-fabricated surgical guides, and stock TMJ prostheses. Case presentation: A 66-year-old female patient, who had a history of multiple TMJ surgeries, complained of severe difficulty in eating and trismus. The 3D virtual surgery was performed with a virtual surgery software (FACEGIDE, MegaGen implant, Daegu, South Korea). After confirmation of the location of the upper margin for resection of the root of the zygoma and the lower margin for resection of the ankylosed condyle, and the position of the fossa and condyle components of stock TMJ prosthesis (Biomet, Jacksonville, FL, USA), the surgical guides were fabricated with CAD/CAM technology. Under general anesthesia, osteotomy and placement of the stock TMJ prosthesis (Biomet) were carried out according to the surgical planning. At 2 months after the operation, the patient was able to open her mouth up to 30 mm without complication. Conclusion: For a patient who has recurrent ankylosis in bilateral TMJs, total joint reconstruction surgery using 3D virtual surgical planning, CAD/CAM-fabricated surgical guides, and stock TMJ prostheses may be an effective surgical treatment option.