• Proceedings of the KIEE Conference
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• 1999.07b
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• pp.603-605
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• 1999

In this paper, the aspects on modeling and control of an existing wind turbine are discussed. When designing control for variable-speed wind turbine, one deals with highly resonant, nonlinear dynamic systems subject to random excitation, i.e. wind turbulence. This requires good knowledge of the dynamics to be controlled. This paper describes an mathematical modeling of wind turbines with emphasis on control design for an existing wind turbine.

• 제어로봇시스템학회:학술대회논문집
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• 1989.10a
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• pp.776-780
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• 1989

A constant torque dynamometer with associated instrumentation and control functions for the development of friction materials for automotive-type disc brakes, has been developed. Full scale disc pads are subject to a series of intermittent brake applications at a constant rotational speed of the brake disc and constant braking power. This paper gives a description of the dynamometer and an example of results obtained.

• 제어로봇시스템학회:학술대회논문집
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• 1988.10a
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• pp.92-97
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• 1988

The path planning is done at the joint level. Cubic spline functions are used for constructing joint trajectories for industrial robots. For N-joint robot, Cartesian knots are transformed into N sets of joint displacements, with one set for each joint. For industrial application the speed of operation affects the productivity. An algorithm is developed to schedule the time intervals between each pair of adjacent knots such that the total traveling time is minimized subject to the physical constraints on joint velocties acceleration and jerks.

• Journal of Energy Engineering
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• v.2 no.2
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• pp.231-236
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• 1993

The feasibility of Magnetohydrodynamic(MHD) Ship Propulsion using Superconduction Magnets is reviewed in light of relent advances in high-temperature superconducting. The propulsion using a screw propeller in the noise reduction has it's own limitation. The epochal noiseless MHD propulsion method which does not have this disadvantage is studying nowadays. The subject of a marine MHD as propulsion has been examined before and was found to be interesting because of relatively low magnetic flux densities. It is demonstrated that the MHD propulsion is technically interesting with high magnetic flux density. The development of large-scale magnets using the high-temperature superconductor now under development could make it practical to construct submersibles for high-speed and silent operation.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2001.11a
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• pp.488-493
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• 2001

In accordance with the tendance to construct high-rise apartment buildings, the transporting elevators tend to speed up to 90-105m／min and to drive more frequently. So, the problem of noise produced by the elevator operation has been treated as an important subject. In this research, the actual conditions of noise and vibration which generated and transmitted by the elevator operation in apartment buildings were measured and analysed. And the several noise and vibration control design which helps reduce noise were examined.

• Journal of Korean Physical Therapy Science
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• v.1 no.1
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• pp.203-213
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• 1994

As a new concept of resistive exercise, isokinetic exercise was developed during the late 1960's. In isokinetic exercise, the subject works at a fixed speed aganist variable and totally accommodating resistance. During isokinetic exercise the resistance accommodates the external maintains maximum output throughout the full range of motion. The maximum torque during isokinetic movements is a measure of the muscular force applied in dynamic conditions.

• IE interfaces
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• v.12 no.2
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• pp.337-345
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• 1999

This paper presents the optimization of a drilling operation subject to machining constraints such as power, torque, thrust, speed and feed rate. The optimization is meant to minimize the machining time required to produce a hole. For the first time, the effects of a pilot hole are included in the formulation of the machining constraints. The optimization problem is solved by using the geometric programming technique. The dual problem is simplified based on the characteristics of the problem, and the effects of machining constraints on the machining variables are identified.

• International Journal of Naval Architecture and Ocean Engineering
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• v.7 no.3
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• pp.500-508
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• 2015

High-speed heavy loaded monohull ships can benefit from application of drag-reducing air cavities under stepped hull bottoms. The subject of this paper is the steady hydrodynamic modeling of semi-planing air-cavity hulls. The current method is based on a linearized potential-flow theory for surface flows. The mathematical model description and parametric calculation results for a selected configuration with pressurized and open air cavities are presented.

• The monthly packaging world
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• s.375
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• pp.64-75
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• 2024

급변하는 산업 환경에 대응하기 위한 해답 찾기 노력이 활발하게 진행되고 있다. 포장계에서도 예외는 아니다. 업계 목소리 등을 반영해 가장 시급한 subject를 선택, 고증의 자료 검토 및 분석을 통한 다양한 보고서들이 연이어 나오고 있다. 이 중 기본 검토 항목부터 최종 검토내용까지 단계별로 촘촘하게 가이드하고 있는 연포장 어플리케이션 LDPE 압출 코팅 라인의 생산성 증가 방법에 대한 연구 내용을 연재 한다.

• The monthly packaging world
• /
• s.374
• /
• pp.76-85
• /
• 2024

급변하는 산업 환경에 대응하기 위한 해답 찾기 노력이 활발하게 진행되고 있다. 포장계에서도 예외는 아니다. 업계 목소리 등을 반영해 가장 시급한 subject를 선택, 고증의 자료 검토 및 분석을 통한 다양한 보고서들이 연이어 나오고 있다. 이 중 기본 검토 항목부터 최종 검토내용까지 단계별로 촘촘하게 가이드하고 있는 연포장 어플리케이션 LDPE 압출 코팅 라인의 생산성 증가 방법에 대한 연구 내용을 연재 한다.