• Journal of Korean Institute of Industrial Engineers
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• v.25 no.2
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• pp.282-289
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• 1999

To minimize a real world test of underwater guided vehicle, it is necessary to perform a test on ground by using closed loop test techniques. This paper describes implementation of HILS(Hardware In the Loop Simulation) system for ground test and test methodologies for performance evaluation of a guided weapon. HILS system uses a real time distributed computer and a real time processing technique. Ground test results of underwater vehicle are presented for moving and stationary targets by using HILS system.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.05a
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• pp.740-742
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• 2023

객체 인식 연구에 있어서 딥러닝 기반의 사람 인식에 있어서 많은 연구들이 공개되고 있다. 특히 화재사고에 있어서 연기로 인해 가시성이 떨어져 인명구조에 어려움이 발생한다. 이에 열화상 카메라와 딥러닝을 통해 사람을 인식하는 기술이 연구되고 있다. 기존 연구에서는 열화상 카메라와 YOLO 딥러닝을 통해 사람을 인식하는데 95%의 성능을 보였지만, YOLO는 그리드 셀에서 하나의 분류만하기 때문에 물체에 가려진 사람을 판별하는데 정확도가 낮았다. 본 논문에서는 이와 같은 한계를 극복하기 위해 기존 Faster R-CNN 알고리즘을 사용한다. 신체부위 Guided Attention mechanism을 사용하여 가중치를 준 Feature Map을 RPN에 적용시켜 학습모델을 구현한다면 더 높은 정확도를 얻을 수 있다. 향후 본 논문에서 제안하는 기법은 많은 실험과 다양한 데이터 셋을 통해 실질적인 검증을 할 예정이다.

• The korean journal of orthodontics
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• v.47 no.2
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• pp.130-141
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• 2017

The aim of this case report was to describe an innovative orthodontic treatment method that combined surgical and orthodontic techniques. The novel method was used to achieve a positive result in a case of moderate crowding by employing a computer-guided piezocision procedure followed by the use of clear aligners. A 23-year-old woman had a malocclusion with moderate crowding. Her periodontal indices, oral health-related quality of life (OHRQoL), and treatment time were evaluated. The treatment included interproximal corticotomy cuts extending through the entire thickness of the cortical layer, without a full-thickness flap reflection. This was achieved with a three-dimensionally printed surgical guide using computer-aided design and computer-aided manufacturing. Orthodontic force was applied to the teeth immediately after surgery by using clear appliances for better control of tooth movement. The total treatment time was 8 months. The periodontal indices improved after crowding correction, but the oral health impact profile showed a slight deterioration of OHRQoL during the 3 days following surgery. At the 2-year retention follow-up, the stability of treatment was excellent. The reduction in surgical time and patient discomfort, increased periodontal safety and patient acceptability, and accurate control of orthodontic movement without the risk of losing anchorage may encourage the use of this combined technique in appropriate cases.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.10a
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• pp.131-134
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• 2005

This paper presents a computer-aided simulation and robotic-assisted execution technology of external fixation method to achieve fracture reduction and deformity correction in long bones. Combining the kinematic analysis with a graphic model of the tibia and the fixator allowed 3D simulation and visualization of the adjustments required to reduce fracture or correct bone deformity as a pre-operative planning tool. The developed robot model provided accurate deformity correction with small residual deformity based on the results of the planning. By incorporating the robot model with image-guided system and computer-aided planning, the integrated system could be useful for computer-aided pre-operative planning and robotic-assisted execution in fracture treatment and bone deformity surgery.

• Journal of Intelligence and Information Systems
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• v.11 no.3
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• pp.25-43
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• 2005

In modern automated container terminals, automated guided vehicle (AGV) systems are considered a viable option for the horizontal tansportation of containers between the stacking yard and the quayside cranes. AGVs in a container terminal move rather freely and do not follow fixed guide paths. For an efficient operation of such AGVs, however, a sophisticated traffic management system is required. Although the flexible routing scheme allows us to find the shortest possible routes for each of the AGVs, it may incur many coincidental encounters and path intersections of the AGVs, leading to collisions or deadlocks. However, the computational cost of perfect prediction and avoidance of deadlocks is prohibitively expensive for a real time application. In this paper, we propose a traffic control method that predicts and avoids some simple, but at the same time the most frequently occurring, cases of deadlocks between two AGVs. More complicated deadlock situations are not predicted ahead of time but detected and resolved after they occur. Our method is computationally cheap and readily applicable to real time applications. The efficiency and effectiveness of our proposed methods have been validated by simulation.

• The Journal of Korean Academy of Prosthodontics
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• v.57 no.2
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• pp.150-159
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• 2019

Nowadays, dental implant is one of the widely used treatment options for edentulous patients. Recently, a method of improving the accuracy of implant surgery using an implant surgical guide has been introduced and widely used in order to accurately place the implant in a proper position. Full-guided and half-guided implant surgery can be distinguished according to the level of surgical guide application during the implant surgery. It is true that full-guided implant surgery exhibits higher accuracy, but half- guided implant surgery is often performed in a clinical situation due to the factors such as the circumstances of the operation. A partially edentulous patient who lost teeth due to tooth fracture and periodontal disease was treated using implant and fixed prosthesis. Half-guided implant surgery was performed using an implant surgical guide during implant surgery, the accuracy of implant placement was analyzed.

• Proceedings of the KIPE Conference
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• 2016.07a
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• pp.143-144
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• 2016

본 논문에서는 유도무기 및 항공기 탑재장비용 30W급 군사용 DC-DC 컨버터를 설계하며, 군사용 전원장치 규격과 기존 군사용 DC-DC 컨버터 제품의 성능을 분석하여 개발제품의 요구사양을 정립한다. 기존 산업용 컨버터와 군사용 컨버터의 설계 방식 차이점을 분석한 뒤 MIL 규격과 정량적 요구사양 만족 여부를 실험 및 공인인증기관 시험을 통해 검증한다.

• Journal of the Korea Computer Graphics Society
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• v.11 no.2
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• pp.1-8
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• 2005

하나의 치아가 일부 파손되어 수복되어야 할 보철물을 인레이/온레이(Inlay/Onlay)라 한다. 본 논문에서는 3차원 메쉬 기반 모델에서 보다 정확한 인레이/온레이를 효과적으로 모델링하기 위한 기법을 제안한다. 인레이/온레이는 지대치와 접하는 내면과 밖으로 들어나는 외면으로 구성된다. 인레이/온레이의 내면 모델링은 2차원 다각선상의 Minkowski Sum 알고리즘을 이용하여 지대치와의 접합력을 확보한다. 그리고 미리 데이터베이스에 저장된 표준 치아 모델, 치과의사에 의해 만들어진 FGP(functionally guided plane) 및 메쉬의 변형 기법인 DMFFD(direct manipulation free-form deformation) 기법[16]과 MWD(multiple wires deformation) 기법[24]을 이용하여 외면을 모델링한다. 데이터베이스에 저장된 표준 치아는 인레이/온레이 외면의 형태를 결정하기 위해 사용되며, FGP는 환자의 인접면과 교합면의 특성을 반영하기 위해 사용되었다. 마지막으로 3차원 메쉬의 두 변형 기법인 DMFFD와 MWD 기법은 환자의 인접면과 교합면을 반영한 치아의 형태를 만들어 내기 위해 사용된다. 본 논문에서 제안한 방법은 인레이/온레이의 내면과 외면을 설계할 때 필요한 정보를 미리 설정하여 처리하므로 기존의 방법에 비해 짧은 시간에 보다 정확한 인레이/온레이를 설계할 수 있었다.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04a
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• pp.139-142
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• 2002

본 논문은 이 기종간의 표준 압축형식을 변환하는데 있어 실시간 변환이 가능하도록 하며 프레임의 특성을 이용하여 압축률을 좀 더 높여 보는데 그 목적을 두고 있다. 이 기종간의 표준 압축형식 변환으로 MPEG2에서 H.263으로의 변환을 시도하였다. MPEG2에서 H.263으로 변환 시 압축률을 높이기 위한 분석결과 MPEG2 의 P 프레임내 인트라 매크로블록이 H.263 의 P 프레임의 인트라 매크로블록 수보다 많다는 것을 알 수 있었다. 따라서 본 논문에서는 P 프레임의 압축률을 높이기 위하여 P 프레임내의 인트라 매크로블륵 변환 과정에 움직임 예측과정을 삽입하고 움직임 예측 과정의 복잡도를 줄이기 위하여 Guided 탐색 방법을 사용하여 MPEG2 P 프레임에 생성된 인트라 매크로블록의 개수를 줄일 수 있다는 것을 제안하였다.

• Journal of the Optical Society of Korea
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• v.14 no.1
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• pp.1-13
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• 2010

This paper describes a development of a fiber optic common-path optical coherence tomography (OCT) based imaging and guided system that possess ability to reliably identify optically transparent targets that are on the micron scale; ability to maintain a precise and safe position from the target; ability to provide spectroscopic imaging; ability to imaging biological target in 3-D. The system is based on a high resolution fiber optic Common-Path OCT (CP-OCT) that can be integrated into various mini-probes and tools. The system is capable of obtaining >70K A-scan per second with a resolution better than $3\;{\mu}m$. We have demonstrated that the system is capable of one-dimensional real-time depth tracking, tool motion limiting and motion compensation, oxygen-saturation level imaging, and high resolution 3-D images for various biomedical applications.