• Archives of design research
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• v.11 no.1
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• pp.109-118
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• 1998

Recently, the importance of user-interface design has been increasing due to the development of electronic and semiconductor technology. Under these surroundings a lot of Approaches that are for the analysis of video sequential data have been developed. The study on the method of analysing various aspects in the use of real product should find the characteristics of users' behavior. Also, the study should include the interaction dffects among these aspects. For these reasons this study proposed an analysis method for the video sequential data of usability test. The study begins with discussing the nature of user-interface through reviewing the various aspects of user-interface. Based on the findings the structure of methods that analyze the characterisics of user's behavior is identified. Thereafter, we developed a computerized tool for analysing video sequential data from usability tests. The tool comprises of four different modules: module for identifying users' profiles, module for video data logging, module for analysing user's characteristics, and module for synthesizing these data for user-interface design. Finally findings are summarized and further research was suggested.

• Proceedings of the KIEE Conference
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• 1992.07a
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• pp.503-505
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• 1992

This paper describes the optimization of design variables of SLIM using finite element method and SUMT(Sequential Unconstrained Minimization Technique). Thrust is taken as an objective function in order to maximize thrust under constant current drive, and seven independent design variables and nine constraints are chosen. As a result, $\tau$/g(pole pitch/airgap) and $\tau$/$d_{AL}$(pole pitch/aluminum depth) of good criteria in SLIM design are determined.

• Proceedings of the Earthquake Engineering Society of Korea Conference
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• 2003.09a
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• pp.395-402
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• 2003

Characteristics of base isolators including frictional and hysteretic types may be described by Bouc-Wen model. A probabilistic optimum design method of the base isolation system using Bouc-Wen model is presented in this paper. For optimum design, the objective function and constraints are derived based on the stochastic responses of the system. As a numerical example, the optimum design problem of a three-story base isolated shear type structure is formulated and solved by the sequential quadratic programming method.

• Structural Engineering and Mechanics
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• v.5 no.5
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• pp.565-576
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• 1997

The material-based homogenization design method generates arbitrary topologies of initial structural design as well as reinforcement structural design by controlling the amount of material available. However, if a small volume constraint is specified in the design of Lightweight structures, thin and slender structures are usually obtained. For these structures stability becomes one of the most important requirements. Thus, to prevent overall buckling (that is, to increase stability), the objective of the design is to maximize the buckling load of a structure. In this paper, the buckling analysis is restricted to the linear buckling behavior of a structure. The global stability requirement is defined as a stiffness constraint, and determined by solving the eigenvalue problem. The optimality conditions to update the design variables are derived based on the sequential convex approximation method and the dual method. Illustrated examples are presented to validate the feasibility of this method in the design of structures.

• Proceedings of the KSME Conference
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• 2004.11a
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• pp.1022-1027
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• 2004

In this study, the shape of plate-fin type heat sink is numerically optimized to acquire the minimum pressure drop under the required temperature rise. To do this, a new sequential approximate optimization (SAO) is proposed and it is integrated with the computational fluid dynamics (CFD). In thermal/fluid systems for constrained nonlinear optimization problems, three fundamental difficulties such as high cost for function evaluations (i.e., pressure drop and thermal resistance), the absence of design sensitivity information, and the occurrence of numerical noise are confronted. To overcome these problems, the progressive quadratic response surface method (PQRSM), which is one of the sequential approximate optimization algorithms, is proposed and the heat sink is optimize by means of the PQRSM.

• Proceedings of the KIEE Conference
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• 1987.07b
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• pp.1471-1475
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• 1987

This paper proposes testable design of sequential NMOS PLAs. The extra bit lines and devices are added to the conventional PLAs. The time is taken to assigning devices in the extra bit lines, which is excessive in the conventional method, is reduced by using the symmetrical distance matrix of the PLA and the regular assigning method. As a result, the test patterns can be easily generated. Also, the silicon area overhead of extra hardware is low.

• Proceedings of the KIEE Conference
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• 1987.07b
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• pp.1476-1480
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• 1987

This paper proposes a design method for SCLA(sequential CMOS Domino Logic Array) using 1-level CMOS Domino Logic and Stable Shift Register Latch. Also an algorithm to generate a test sequence and a test procedure for the SCLA are presented. The SCLA has advantages of low power consumption, high density and high speed, and performs hazard-and race-free logic operation, because of using SSRL(Stable Shift Register Latch). By using the proposed test method, all of stuck-at, cross-point, stuck-on and stuck-open faults in SCLA are detected by short test sequence.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.828-829
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• 2008

This paper proposes a new pole shaped magnetizing fixture with a non uniform air gap for sinusoidal magnetizing a ring type permanent magnet (PM) to reduce the cogging torque. To obtain more sinusoidal distributed magnetic flux density, the magnetizing fixture's pole shape is optimized by using the sequential response surface method (RSM). And the effects of each design parameter were investigated using the magnetic analysis combined a time stepping finite element method (FEM) with Preisach model. It has been shown, through numerical analysis the optimized modelgives near sinusoidal distributed air gap flux density and drastically reduced cogging torque.

• Korean Journal of Hydrosciences
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• v.8
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• pp.125-136
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• 1997

The simulation techniques of hydrologic data series have develped for the purposes of the design of water resources system, the optimization of reservoir operation, and the design of flood control of reservoir, etc. While the stochastic models are usually used in most analysis of water resources fields for the generation of data sequences, the indexed sequential modeling (ISM) method based on generation of a series of overlapping short-term flow sequences directly from the historical record has been used for the data generation in the western USA since the early of 1980s. It was reported that the reliable results by ISM were obtained in practical applications. In this study, we generate annual inflow series at a location of Hong Cheon Dam site by using ISM method and autoregressive, order-1 model (AR(1)), and estimate the drought characteristics for the comparison aim between ISM and AR(1).

• Transactions of Materials Processing
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• v.9 no.6
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• pp.598-603
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• 2000

In order to improve trial-and-error based conventional practices for optimizing forming processes, a direct design method to guide iterative design practices, called the ideal forming theory, has been previously developed. In the theory, material elements are required to deform following the minimum Plastic work Path. The theory can be used to determine the ideal initial blank shape needed to best achieve a specified final shape while resulting in optimum strain distributions. In this work, the direct design method based on the ideal forming theory was applied to design initial design shape for VCR deck chassis. Based on the solution of the ideal forming theory, FEM analysis was utilized to evaluate an optimum blank shape to be formed without tearing. Simulation results are in good agreement with experimental data. It was shown that the proposed sequential design procedure based on direct design method and FEM can be successfully applied to optimize the die design Procedure of sheet metal forming processes.