• Journal of the Korea Society for Simulation
• /
• v.1 no.1
• /
• pp.87-102
• /
• 1992

This paper presents the development of event-driven system level simulation tool SMPLE(Smpl Extende, an extention fo smpl) and its application to the performance analysis of multiprocessor computer systems. Because of its data structure, it is very difficult to change, expand or add new functions to simulation language smpl implemented by MacDougall. In SMPLE, we change data structure with structure and pointer, add new functions, and enable dynamic memory management. Using new data structure, facilities, and functions added in SMPLE, we simulate job processing of a shared bus multiprocessor system with autonomous hierarchical I/O subsystem. We set system performance contribution of subsystems and units. The impact of disk I/O on system performance is evaluated under vairous conditions of number of processors, processing power, memory access time and disk seek time.

• Journal of the Architectural Institute of Korea Structure & Construction
• /
• v.34 no.2
• /
• pp.3-10
• /
• 2018

Damage location and extent of structure could be detected by the inverse analysis on dynamic response properties such as frequencies and mode shapes. In practice the measured difference of natural frequencies represent the stiffness change reliably, however the measured mode shape is insensitive for stiffness change, but provides spatial information of damage. The damage detection index on shear building structures is formulated in this study. The damage detection index could be estimated from mode shape and srory stiffness of undamaged structure and frequency difference between undamaged and damaged structure. For the verification of the observed damage detection method, the numerical analysis of Matlab and MIDAS and shacking table test were performed. In results, the damage index of damaged story was estimated so higher than undamaged stories that indicates the damaged story apparently.

• Journal of architectural history
• /
• v.10 no.3 s.27
• /
• pp.77-91
• /
• 2001

The study is the analysis on Oe-am village which is designated as a folk-preservation village in 1988 and is included in the fact of the dwelling change through Spot-Survey and Case-Investigation in the last decade from now(2001), The result shows the main change on the stand-up dining room installation, the place with the boiler and bathroom installation, the additional expansion through the combination of the small twice or third space, the using change, the prototype restoration. The reason of this change is shown the following. 1. There is the dual structure that the villager repairs that because the repairing operation is biased the prototype restoration since the government construction. 2. The internal change is come from more at thatched house than at tiled house and the order of the main element's change is Kitchen (35%), main room (30%), living room (24%) and other rest room (11%). 3. The change of the dining room in the internal composition material is the strongest and the change is included in the using change, the installation of the new sub-division in the spot and the expansion of the outside if necessary. The reason of the main change is life-style's. Therefore we can know the change of the dwelling structure and we are able to make a modern-life. Also, If the restoration or repair is necessary, the change element on that must be considered.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
• /
• 2002.04a
• /
• pp.682-686
• /
• 2002

This study predicts the sensitivity coefficient by the change of dynamic Characteristics of the Structure. The method is applied to examples of a cantilever and 3 degree of freedom lumped mass model by modifying the mass and stiffness. The predicted the sensitivity coefficient are in good agreement with these from the structural reanalysis using the modified mass and stiffness.

• Proceedings of the Korean Fiber Society Conference
• /
• 1997.04a
• /
• pp.328-332
• /
• 1997

Hot stretching focused on the improvement of properties of poly(L-lactic acid) fiber. Some aliphatic polyesters are biodegradable under microbial attack and the new unique applications are expected. Generally, these materials have a somewhat low melting temperature and low mechanical properties compared with the aromatic polyesters. In this study, melt-spinning of poly(L-lactic acid) was conducted. We investigated effects of the stretching and the molecular orientation of aliphatic polyester fibers on the change of fine-structure. Glass transition temperature, molecular orientation and crystallinity increased according to the increase of stretching ratio.

• Proceedings of the Optical Society of Korea Conference
• /
• 2004.07a
• /
• pp.172-173
• /
• 2004

Recently there has been many understood the basis device physics OLEDs and their basic operating principle. We demonstrate that there have many relation in order to improve luminescence efficiency both emitting light material physics characteristics and luminary. Efficient Electro Luminescence from organic materials was first reported in 1987 at Kodak. OLEDs emitting light material use tris-(8-hydroxyquinoline)(Alq3). Sudied maximum luminescence efficiency about structure of optimized emitting light layer of OLED which do observing change of luminescence efficiency by structure change of organic material in this paper.

• Journal of the Korean Society for Precision Engineering
• /
• v.15 no.10
• /
• pp.120-127
• /
• 1998

In this study the dynamic characteristics of automatic transmission system due to the change of the planetary gear ratio is studied. To study the power flow and shift quality for power transmission the simulation program is developed using the modeling and analysis technique. The results from this study will be used in designing the basic structure of automatic transmission using planetary gear system.

• Journal of Korean Society of Industrial and Systems Engineering
• /
• v.22 no.52
• /
• pp.241-246
• /
• 1999

In this study, to specify an evaluation of human sensibility, the types of color, intensity of illuminations and lights consisting work environmental condition are decided, and image data from examining the change of human sensibility followed by changes of the above three conditions are obtained. Using the factor analysis and quantification theory in multi-variate analysis type of Sensibility Ergonomics, determinating the structure of factors, specifying the relations of environmental conditions and factors can be done so that the structure of image on human sensibility space with the change of environmental conditions is analyzed.

• Journal of Electrical Engineering and information Science
• /
• v.1 no.2
• /
• pp.101-108
• /
• 1996

A new speed controller based on the fuzzy algorithm with hierarchical structure is presented. The input variables of the controller are speed error and its derivative(change of error), where the output variable is the change of torque current command. Several comparisons were performed with conventional PI (proportional plus integral) controller and proposed controller. These controllers are applied to the laboratory model drive system with 2.2kW induction motor. Some simulation and experimental results show that the speed controller using fuzzy algorithm is more robust than the conventional PI controller.

• Proceedings of the Earthquake Engineering Society of Korea Conference
• /
• 2002.03a
• /
• pp.239-249
• /
• 2002

The Turbine Building of nuclear power plant is classified as non safety-related structure. During the operation, there may be possibility the original licensing basis would be changed, which makes non safety-related structure safety-related. Such a change in regulation requires utility to perform seismic qualification for the existing structure and their facilities. Thus it is meaningful to evaluate seismic margin of the existing non-qualified building structure. In addition, in this paper it is shown that a modification to the structure can enhance their seismic capacity.