• 한국정밀공학회지
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• 제26권11호
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• pp.108-115
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• 2009

In metal forming technologies, the stamping process is one of the significant manufacturing processes to produce sheet metal components. It is important to design stamping process which can produce sound products without defect such as fracture and wrinkle. The objective of this study is to propose the feasible formability diagram which denotes the safe region without fracture and wrinkle for effective design of stamping process. To determine the feasible formability diagram, FE-analyses were firstly performed for the combinations of process parameters and then the characteristic values for fracture and wrinkle were estimated from the results of FE-analyses based on forming limit diagram. The characteristic values were extended through training of the artificial neural network. The feasible formability diagram was finally determined for various combinations of process parameters. The stamping process of turret suspension to support suspension module was taken as an example to verify the effectiveness of feasible formability diagram. The results of FE-analyses for process conditions within fracture and wrinkle as well as safe regions were in good agreement with experimental ones.

• 전기전자학회논문지
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• 제15권3호
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• pp.227-234
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• 2011

The Interest in robotics has been steadily increasing in recent times both in Korea as well as abroad. Research on robots for new and diverse fields is ongoing. This study discusses the current research and development on robot actuator, which are used to control the joints of robots, and focuses on developing more efficient technology for joint control, as compared with the current technologies. It also aims to find means to apply the abovementioned technology to diverse industrial fields. We found that easy and effective control of actuators could be achieved by using ZigBee sensor networks, which were widely being used on wireless communications. Throughout the experiments it is proved that the developed wireless actuator could be used for easy control of various robot joints. This technology can be effectively applied to develop two-legged robots that will be able to walk like human, or even quadruped and hexapod robots. It can also be applied to motors used in industry. In this study, we develop an extremely minimized ZigBee sensor network module that can be used to control various servo motors with low power consumption even if it is long distances. We realized effective wireless control by optimizing the ZigBee antenna, and were able to quickly check the status of relevant Tree node through mutual communication between the servo motors composing the ZigBee sensor network and the main server control modules. The developed Servo Motor with ZigBee sensor network modules can be applied in both robotics as well as for home or factory automation.

• 한국지능시스템학회논문지
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• 제21권2호
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• pp.159-164
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• 2011

본 연구에서는 4절 링크 이론(four-bar linkage mechanism)과 얀센 메커니즘(Jansen mechanism)을 기반으로 다관절 보행 로봇(multi-legged walking robot)인 게(crab) 로봇을 제작하고, 게 로봇의 움직임에 대하여 기구학적인 해석을 제시한다. 제작된 게 로봇은 영상 획득을 위하여 카메라를 장착하였고, 장애물 회피를 위하여 3조의 초음파 센서를 가지고 있다. 또한 RF통신으로 외부에 영상 정보를 전달하며, Blue-tooth 통신 모듈을 장착하여 외부로부터 부여된 임무를 수행할 수 있다. 게 로봇의 설계와 제작을 하기 위해서 필요로 하는, 로봇 다리의 움직임을 알기 위해서는 관절 변수와 다리 끝단의 위치 및 자세와의 관계를 얻어야 한다. 따라서, 제안된 기구학적 해석은 로봇의 설계와 제작에 있어서 많은 도움을 주며 중요한 과정이다.

• 한국추진공학회지
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• 제10권3호
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• pp.18-25
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• 2006

체계 요구조건에 빠르고 정확한 자료제공을 위해 고체추진기관 구조체에 대한 설계자동화 프로그램인 'ProDes'를 개발하고 검증하여 그 성능을 입증하였다 주어진 체계설계 요구도 및 구속조건으로부터 총 개발기간과 인력을 획기적으로 감소시키며, 또 설계, 해석, 시뮬레이션 및 도면화 등 일련의 업무를 통합적으로 수행하기 위해 프로그램 개발이 수행되었다. 프로그램은 모듈화되어 있으며, 각 단계별 계산은 설계 변수별 적용연구가 수행되어 최종 설계 목표치에 도달되도록 구성 되어있다. 다양한 종류의 마스터 모델로 된 구성품과 체결형태는 구축된 라이브러리 DB 모듈로부터 얻어진다. 개발 프로그램을 이용한 추진기관 구조체 설계와 기존 상세된 설계를 비교 분석한 결과 서로 잘 일치함을 확인하였다.

• 제어로봇시스템학회논문지
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• 제22권11호
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• pp.912-918
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• 2016

This paper presents various strategies for humanoid vehicle driving and egress tasks. For driving, a tele-operating system that controls a robot based on a human operator's commands is built. In addition, an autonomous assistant module is developed for the operator. Normal position control can result in severe damage to robots when they egress from vehicles. To prevent this problem, another approach that mixes various joint control techniques is adopted in this study. Additionally, a footplate is newly designed and attached to the vehicle floor for the ground landing phase of the egress task. The attached plate enables the robot to step down onto the ground in a safe manner. For stable locomotion, a balance controller is designed for the humanoid. For the design of the controller, the robot is modeled using an inverted pendulum that consists of a spring and a damper. Then, a state feedback controller (with pole placement and a state observer) is built based on the simplified model. Many approaches that are presented in this paper were successfully applied to a full-sized humanoid, DRC-HUBO+, in the DARPA Robotics Challenge Finals, which were held in the United States in 2015.

• 대한지리학회지
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• 제50권6호
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• pp.621-639
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• 2015

1990년대 후반 이후 완성차 메이커의 구조조정, 외국 부품공급업체의 국내진출, 글로벌 차원에서의 부품조달, 산업의 IT화에 따른 개방적 부품 조달체계의 확산, 그리고 모듈화 등이 수직적인 부품조달체계를 완화시키는 요인으로 작용하고 있다. 이와 같은 완성차 생산의 내외 환경변화에 따라 본 연구에서는 완성차 조립공장에 1차 공급업체와 모듈기업이 공급하는 부품의 지역적 물류체계가 어떻게 이루어지고 있는가를 밝히는 것을 목적으로 기존문헌 및 인터뷰 조사를 실시했다. 그 분석결과는 다음과 같다. 완성차 부품공급의 지역적 물류체계는 완성차 조립공장을 중심으로 공장 내에나 인접지역에 모듈공장이 입지하는데, 1차 공급업체의 부품은 근접권에서 살펴본 바와 같이 공급의 분산비율이 비교적 높게 나타나 JIT의 다빈도 소량배송보다는 자동차 조립공장 인근에 통합물류센터를 설치해 부품을 공급하고 여기에서 다시 조립공장에 납품을 한다. 이렇게 함 으로서 부품공급업체나 조립공장 모두에게 배송비용을 줄여주고 부품의 안정적인 공급이 이루어지기 때문에 중층적인 모듈 반제품을 위한 부품공급도 이와 같은 방식을 취한다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 International Symposium on GPS/GNSS Vol.2
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• pp.3-8
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• 2006

The next decade promises drastic improvements and additions to global navigation satellite systems (GNSS). Plans for GPS modernization include a civilian code measurement on the L2 frequency and a new L5 signal at 1176.45 MHz. Current speculations indicate that a fully operational constellation with these improvements could be available by 2013. Simultaneously, the Galileo Joint Undertaking is in the development and validation stages of introducing a parallel GNSS called Galileo. Galileo will also transmit freely available satellite navigation signals on three frequencies and is scheduled to be fully operational as early as 2008. In other words, a dual system receiver (e.g., GPS+GALILEO) for general users can access six civil frequencies transmitted by at least fifty eights navigation satellites in space. The advent of GALILEO and the modernization of GPS raise a lot of attention to the study of the compatibility and interoperability of the two systems. A number of performance analyses have been conducted in a global scale with respect to availability, reliability, accuracy and integrity in different simulated scenarios (such as open sky and urban canyons) for the two systems individually and when integrated. Therefore, the scope of this article aims at providing the technical benefits analysis for Taiwan specifically in terms of the performance indices mentioned above in a local scale, especially in typical urban canyon scenarios. The conclusions gained by this study will be applied by the Land Survey Bureau of Taiwanese as the guideline for developing future GNSS tracking facilities and dual GNSS processing module for precise surveying applications in static and kinematic modes.

• 한국한의학연구원논문집
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• 제9권2호
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• pp.121-130
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• 2003

The goal of this study is construction and efficacy evaluation of MPC-25 (Magnetic Pain Control-25), a medical device using magnetic stimulation. MPC-25 consists of a main body containing power supply and control module and a bed containing magnetic core and coil. In distinction from electric pain control medical devices, magnetic pain control system is non-contact, so the patients need not take off their clothes to be treated. High amplitude current pulses are applied to a magnetic coil and induce time varying magnetic field generating eddy current in a conductor like human body. Clinical efficacy test was performed in patients suffering from musculoskeletal pain of lumbar, shoulder and joint. Degree of pain before and after treatment for 30 minutes was compared using Visual Analogous Scale. As a result, 14 cases out of 20 showed decreased pain perception, so the rate of efficacy is 70%. Reduction of pain perception was statistically significant (P=0.001 by Wilcoxon Signed Rank Test).

• 사회경제평론
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• 제31권3호
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• pp.29-53
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• 2018

본 연구는 산업협력을 중심으로 한 남북한 경제협력의 필요성과 방향을 제시하였다. 남북한은 독립적 경제구역으로서 단계적이고 기능적인 협력과정을 거칠 수밖에 없다. 양 시장의 '개방과 통합'에 의한 경제적 수렴을 통하여 궁극적으로 한반도내에 경제공동체를 형성할 수 있다. 이러한 과정의 성공적 이행은 북한의 순조로운 산업화가 전제되어야 한다. 그 모형으로서 한반도 산업개발공동체 설립방안이 본 연구에서 제시되었다. 이는 산업협력을통한 북한의 제조업(경공업) 중심 산업화 지원, 남한의 중소기업 고도화, 북한 주민의 생활여건 개선 수요의 충족을 목적으로 한다. 주요 정책수단은 첫째, 생산지원으로서 지방개발구내 기업의 양적 질적 확대, 생산활동에 필요한 인프라 및 생산설비의 정비 및 확충이다. 둘째, 시장지원으로서 장마당 중심의 교환경제에서 시장시스템으로 고도화한다. 또한 공동산업개발구의 건설을 통하여 북한에 대한 '질서있는 투자'와 '생산분업 모듈'의 발굴 및 구축이 필요하다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제17권8호
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• pp.2068-2082
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• 2023

With the rapid development of deep learning, Depth Map Super-Resolution (DMSR) method has achieved more advanced performances. However, when the upsampling rate is very large, it is difficult to capture the structural consistency between color features and depth features by these DMSR methods. Therefore, we propose a color-image guided DMSR method based on iterative depth feature enhancement. Considering the feature difference between high-quality color features and low-quality depth features, we propose to decompose the depth features into High-Frequency (HF) and Low-Frequency (LF) components. Due to structural homogeneity of depth HF components and HF color features, only HF color features are used to enhance the depth HF features without using the LF color features. Before the HF and LF depth feature decomposition, the LF component of the previous depth decomposition and the updated HF component are combined together. After decomposing and reorganizing recursively-updated features, we combine all the depth LF features with the final updated depth HF features to obtain the enhanced-depth features. Next, the enhanced-depth features are input into the multistage depth map fusion reconstruction block, in which the cross enhancement module is introduced into the reconstruction block to fully mine the spatial correlation of depth map by interleaving various features between different convolution groups. Experimental results can show that the two objective assessments of root mean square error and mean absolute deviation of the proposed method are superior to those of many latest DMSR methods.