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Jaekyung Shim
Name
Jaekyung Shim | Professor
Tel
+82-2-3290-3362
Fax
+82-2-926-9290
E-mail
jkshim@korea.ac.kr
address
410, School of Mechanical Engineering, Korea University, Anam-Dong, Seongbuk-Gu, Seoul 136-713, Korea
Education
Feb. 1984 B.S of Mechanical Engineering, Korea University, Korea
May 1986 M.S of Mechanical Engineering, Columbia University, New York, USA
May 1991 Ph.D of Mechanical Engineering, Columbia University, New York, USA
Lab.
Mechanical Design and CAD Lab
Kinematic Synthesis and Analysis of Mechanisms: Variable Valve Actuation Mechanisms
Variable Valve Actuation (VVA) refers to any mechanism or method that can alter the shape or timing of a valve lift event within an internal combustion engine. The objective of this research is to develop new VVA mechanisms. For the type synthesis of VVA mechanisms, all possible combinations of links and joints that can be assembled into possible VVA mechanisms are listed using graph theory. For dimensional synthesis, envelope theory is applied to determine proper dimensions and cam profiles that satisfy desired valve displacement. For the evaluation of synthesized mechanisms, commercial software such as ADAMS, DAFUL, MATLAB are used.
Synthesis and Analysis of Automotive Suspension Mechanisms
Suspension mechanism is one of the key elements which influence the motion behavior of vehicles. It is important to synthesize and analyze suspension mechanisms properly to secure controllability and stability of a vehicle. The characteristics of vehicle roll motion can be represented by screw axis between a vehicle and the ground, which is determined by the suspension type of the vehicle under consideration. In this research, a three dimensional analysis method is developed using screw axis theory to determine the roll twist axis of a full-car model, and the relationship between the roll characteristics and the joint positions of a suspension mechanism is analyzed.
Human-Oriented Product Design: Adjustable Brake Pedal
An adjustable pedal that can be use is for drivers with various body dimensions would be very convenient. With proper definition of the design parameters, graph theory is applied to the type synthesis of adjustable brake pedal mechanisms. In dimensional synthesis, the selective precision synthesis (SPS) method is used to determine the dimensions of the adjustable mechanism that satisfy the various desired positions and orientations of the pedal. The result is verified by EMG measurements.