• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.21 no.3
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• pp.479-486
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• 2012

This paper presents a high-speed automatic micro-alignment system that is a part of an inspection machine for small-sized molded lenses of mobile phones, palm-top computers, and so on. This work was motivated by the shortcomings of existing highest-grade commercial machine. A simple tip/tilt/Z parallel mechanism is designed based on kinematic couplings, which is a 3-degree-of-freedom (3-DOF) moderate-cost alignment stage. It is used to automatically adjust the posture of each lens on the tray, which is impossible by the conventional instrument. Amplified piezoelectric actuators are used to ensure the accuracy and dynamic response. Forward kinematic analysis and simulation show that the parasitic motion is small enough compared to the actuator stroke. From the workspace analysis of the moving platform, it is clear that the output motion range satisfies the design requirements.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.10a
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• pp.1270-1273
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• 2004

The mechanism design is synthesis of suitable mechanism which can be output motions about input motions. That has generally two steps which are the type synthesis and the dimensional synthesis. And required mechanism analysis step for confirming middle or final result. The type synthesis is definition of mechanism type which required aim and the dimensional synthesis is calculation of dimension about defined type mechanism. The type synthesis of mechanism is included qualitative design field which isn't defined systematic design method. especially, the most difficult step for mechanism design automation. In this paper proposed the component modular design method which is figured mechanism types automate with component modules using component modular approach. And develop CAD(Computer Aided Program) program for application.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2003.02a
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• pp.393-399
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• 2003

산업의 발전과 더불어 농업인구는 해마다 감소하고 있으며 농업 연령층은 고령화 현상이 나타나고 있다. 전체 농가인구와 호당 농업인구가 줄어들고 있는데 반해 호당 경지면적은 매년 증가하고 있다. 노동력은 농업생산비의 가장 큰 비중을 차지하고 있고, 농가의 연령층 또한 고령화가 되어가고 있음을 고려해 본다면 농업의 기계화ㆍ자동화의 필요는 절대적이다. 수확은 재배 과정 가운데 노동력, 시간 및 비용이 가장 많이 소요되는 작업이다. 본 연구는 수확용 매니퓰레이터의 개발을 위한 기구학적 분석을 하는 것이다. 구체적인 연구 목적은 매니퓰레이터의 정방향 기구학 및 역방향 분석을 통해 방정식을 구한 후 장치를 작동시켜 반복오차를 측정한 후 이 값을 이론값과 비교하여 검증하도록 하였다. (중략)

• Journal of Arbitration Studies
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• v.26 no.1
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• pp.135-157
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• 2016

CISG is the most important international convention in the field of international sale of goods. Many arbitration organizations often invoke this convention when settling disputes between the parties concerned. China has been one of the contracting states since the effective date of CISG, and has settled many cases with it. This article aims at analyzing the legal status of CISG in China and the methods with which Chinese arbitration organizations apply CISG. Also, it looks into the existing problems, based on which it provides suggestions for improvement.

• Review of KIISC
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• v.17 no.6
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• pp.93-105
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• 2007

정보보호 분야의 국제표준화는 각 기술들의 특성 및 사용자들의 관점 등을 고려하여, 다양한 국제표준화기구에서 국제 표준개발 및 관련 연구가 이루어지고 있다. 즉, ITU-T SG17에서는 전기통신(Telecommunication) 관점에서 정보보호 응용기술들에 대한 국제표준화가 추진되고 있으며, ISO/IEC JTC1/SC27(정보보호), SC37(바이오인식)에서는 정보보호 원천 기술들에 대한 국제표준화와 IETF Security Area에서는 인터넷 서비스의 품질 보장 및 향상된 인터넷 환경 구축을 위해 실제적 구현 관점에서 국제표준화를 추진하고 있다. 또한, 아시아 지역에서는 각 국가 간에 정보보호 표준화 활동에 대한 정보공유 및 국제표준화 기구들에 대한 공동 대응을 위해 ASTAP, RAISS 포럼, CJK SWIS 등의 소규모 표준화 활동들이 이루어지고 있다. 본 논문에서는 대표적인 국제표준화 기구에서 이루어지고 있는 정보보호 표준화 현황 및 주요 이슈들에 대해 소개하고, 향후 추진방향 등을 제시하여, 국내에서 국제표준화기구에 활동하고자 하는 전문가들에 유용한 자료로 활용하고자 한다.

• Proceedings of the KSME Conference
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• 2000.11a
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• pp.535-540
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• 2000

This paper presents the development of a Parallel-Typed CNC Machining Tool. It is specially designed to machine a complex shaped workpiece by controlling the orientation of the tool. The inverse/direct kinematics of a parallel mechanism is derived and implemented in a PC based controller. With graphics icons, the GUI (Graphic User Interface) program is developed for the CNC programing. The calibration is accomplished by geometric constraint motion, which is a parallel motion of the platform with respect to a table. The calibration result is introduced and the future study is proposed.

• Proceedings of the KSME Conference
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• 2003.11a
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• pp.1512-1517
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• 2003

This paper presents the calibration for the parallel typed tilting table. The calibration system needs only simple sensing device which is a digital indicator to measure the orientation of a table. The calibration algorithm is developed by a measurement operator. It eliminates the concern about the poor parameter observability due to a large number of parameters of parallel-mechanism. This paper uses the QR-decomposition to find the optimal calibration configurations maximizing the linear independence of rows of a observation matrix. The number of identifiable parameters is examined by the rank of the observation matrix, which represents the parameter observability. The method is applied to a Parallel-typed Tilting Table and all the necessary kinematic parameters are identifiable.

• Transactions of the Korean Society of Automotive Engineers
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• v.12 no.5
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• pp.146-153
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• 2004

Torsion beam rear suspension has been widely adopted to the rear suspension of vehicle by reason of simple structure and cost competitiveness. Since the kinematic characteristics of torsion beam rear suspension are determined by elastic behavior of torsion beam, quasi-static analysis based on finite element modeling of torsion beam has been conducted to obtain the kinematic parameters of torsion beam rear suspension. In this paper, simple kinematic equations with rear geometric parameters are derived to predict the kinematic behavior of torsion beam rear suspension. The suspension design parameters such as roll center height, roll stiffness, roll steer and roll camber can be easily obtained with the kinematic equations. The suggested kinematic equations are validated from comparison with the test results and solution offered by ADAMS. The suspension design parameters varied with the position of torsion beam are discussed.

• Journal of the Korean Society for Railway
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• v.6 no.4
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• pp.294-299
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• 2003

Using a conventional railway, a tilting train was applied as a means of improving vehicle speed during curve negotiation without any modification of infrastructure. As a study for the optimum design of the tilting mechanism of a tilting vehicle, the kinematics sensitivity of the tilting mechanism was analyzed. Using the geometric relationship of the linkage-type tilting mechanism, the relationship of the parameters and the performance index was defined using nonlinear algebraic equations. With the defined relation, the effect of change in the parameters on the performance was analyzed. The analysis result can be used in the optimum design of a tilting mechanism that considers the track environment, vehicle and operational condition in which the tilting vehicle is applied.

• Review of KIISC
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• v.21 no.2
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• pp.7-18
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• 2011

정보보호 분야의 국제표준화는 기술들의 특성 및 사용자들의 관점 등을 고려하여, 다양한 국제표준화기구에서 국제표준 개발 및 관련 연구가 이루어지고 있다. 즉, ITU-T SG17에서는 전기통신(Telecommunication) 관점에서 통신망에 적용 가능한 응용기술들에 대한 국제표준화가 추진되고 있으며, ISO/IEC JTC1/SC27(정보보호), SC37(바이오인식)에서는 정보보호 원천기술들에 대한 국제표준화를 다루며, IETF Security Area에서는 인터넷 서비스의 품질 보장 및 향상된 인터넷 환경 구축을 위한 산업체 중심의 사실표준을 추진하고 있다. 또한, 유럽 및 아시아 지역에서 국가 간에 정보통신 표준화와 국제표준화 기구들에 대한 공동 대응을 위한 ETSI, ASTAP, OASIS 등에서도 정보보호 표준화 활동들이 이루어지고 있다. 본 논문에서는 정보보호 분야의 대표적인 국제표준화 기구들의 현황 및 주요 이슈, 주요 국가별 추진체계들에 대해 소개하여, 향후 국내에서 국제표준화기구에 활동하고자 하는 전문가들에 유용한 정보를 제공하고자 한다.