• Journal of the Korea Computer Industry Society
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• v.5 no.1
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• pp.177-182
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• 2004

In sonar sensor design impedance matching design to each sensor affects the whole weighting circuit characteristic very much. But there are many examples that it is made by hands or very simple modeling designs. So these design works make trial and error because it is the limitation of flexible correspondence to the many sensors and follows many errors. This study explains organizations and skills in the sensor modeling package design program with real sonar sensor characteristic measure as the first step in impedance matching design.

• International Journal of Fluid Machinery and Systems
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• v.6 no.1
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• pp.18-24
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• 2013

In order to apply the design method of diagonal flow fan based on axial flow design to the design of radial-outflow type diagonal flow fan which has lower specific speed of 600-700 [$min^{-1}$, $m^3/min$, m], radial-outflow type diagonal flow fan which specific speed was 670 [$min^{-1}$, $m^3/min$, m] was designed by a quasi three-dimensional design method. Experimental investigations were conducted by fan characteristics test, flow surveys by a five-hole probe and a hot wire probe. Fan characteristics test agreed well with the design values. In the flow survey at rotor outlet, the characteristic region was observed. Two flow phenomena are considered as the cause of the characteristic region, one is tip leakage vortex near rotor tip and another is pressure surface separation on the rotor blade.

• Journal of Korean Society for Quality Management
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• v.27 no.2
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• pp.218-236
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• 1999

The purpose of parameter design is to determine optimal settings of design parameters of a product or a process such that the performance characteristics of a product exhibit small variabilities around their target values. Taguchi made significant contributions in this area. However, his analysis of the problem focused on only one performance characteristic or response, although in product and process design, multiple characteristics are more common. The critical problem in dealing with multiple characteristics is how to compromise the conflict among the selected levels of the design parameters for each individual characteristic. In this paper, Methodology using SN ratio optimized by univariate technique is proposed and a parameter design procedure to achieve the optimal balance among several different response variables is developed. Existing case studies are solved by the proposed method and the results are compared with ones by the sum of SN ratios, the expected weighted loss, the desirability function, and EXTOPSIS model.

• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1144-1146
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• 2005

This paper presents the optimal design reducing the rotor inertia in order to improve the driving characteristic of BLDCM for robots. The parallel Genetic Algorithm is performed to rotor inertia minimization in optimal design. Also, velocity profile with finite jerk method is introduced to reduce vibration of BLDCM. As a result, a torque characteristic is same although rotor inertia is reduced 2/3 compared with prototype model. And, maximum vibration value is reduced by 63.4[%1 according to apply finite jerk.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.1691-1694
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• 2005

The fatigue characteristic of a material or a structure is derived from fatigue tests of standard specimens. However test results of standard specimens are very different from those of real structures or components. Therefore, to calculate more accurate fatigue life, the geometrical effect and surface condition must be considered by comparing test results of standard specimens with those of real structures or components. Thus the object of this paper is to evaluate the fatigue characteristic of a real waterwork pipe by conducting fatigue tests with standard specimens and non-standard(plate-shaped) specimens of base metal and weld metal. Also, to evaluate fatigue characteristic based on life distribution, statistical fatigue characteristic was analyzed by the normal distribution and related data of P-S-N curve.

• Journal of Korean Society of Water and Wastewater
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• v.28 no.5
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• pp.581-587
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• 2014

Sediment basin that is typical facility installed for development business to prevent soil erosion has low removal efficiency and therefore, it causes complaints from the residents and has a bad effect on ecosystem. Thus there is a limit to control soil erosion using the existing design methods of sediment basin, so the purposes of this study is providing suitable design factors for sediment basin with regarding soil characteristic of development areas and analysing sedimentation characteristic by inflow concentration changes. The results, for analyzing the sedimentation characteristic by soil concentrations within approximately 2,000 ~ 20,000 mg/L of initial SS concentration, indicated similar sedimentation trends for same soil in the supernatant regardless of initial concentrations. However, for different soil characteristic (percent finer), there are different results in sedimentation rate and concentrations of the supernatant. Thus it is recommended that sediment basin to prevent soil erosion during construction should be designed based on retention time derived from soil sedimentation experiments regardless of inlet concentration. In addition, installing the soil erosion prevention facility at the back to satisfy effluent water quality should be considered to minimize soil erosion effectively.

• The KSFM Journal of Fluid Machinery
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• v.11 no.3
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• pp.43-49
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• 2008

The pump control valve is a butterfly valve that has an eccentric rotating axis. It is not only used as a butterfly valve to control the flow rate or pressure, but also as a check valve to prevent backward flow. A new design method of eccentric rotating axis is proposed to design the valve. The height of the rotating axis is determined through flow field analysis. A general purpose of computational fluid dynamics software system, Fluent is used to simulate the fluid flow. Flow field analysis is performed for various heights of the rotating axis and different opening angles of the valve. A characteristic function is defined for estimating the flow characteristics based on the results of flow field analysis. The characteristic function is defined in order to determine the height of the rotating axis. An optimization problem with a characteristic function is formulated to determine the amount of eccentricity. The height of the Totaling axis of the valve is determined through solving the optimization problem.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.33 no.3
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• pp.957-964
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• 2013

This research is on the methodology of flood risk assessment using flooding characteristic values. Necessity of design magnitude for flood control considering floods was judged by plotting peak flow with respect to frequency and duration, and flooding magnitude was defined with 6 flooding characteristic values which were proposed to be significant factors when assessing flooding magnitude. Precipitation data used in the assessment modeling were applied by combining all the possible precipitation events. After overlapping the simulated results with precipitation matrix by flooding characteristic values, contour map was drawn, and Flooding characteristic contour graph for possible rainfall events were suggested in respect of all possible precipitation. Flooding characteristic contour graph for possible rainfall events was confirmed that reducing of damage magnitude of each flood characteristic value was figured out easily. The flood risk assessment methods suggested in this study would be a good reference for urban drainage system design, which only focuses on pipe conduit.

• Korean Institute of Interior Design Journal
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• v.21 no.5
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• pp.227-236
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• 2012

In order to discuss identity of Interior Design as an academic study, I analyzed educational objectives and curriculums of Interior Design in tertiary educational institutions. To this end, I surveyed 83 colleges and categorized those colleges based on their school system and academic field where the college is included. First, according to the school system I classified them into 2-, 3-, 4-year course. Then, I categorized each of them into subcategories based on their fields; 2 year course into Design field and Construction Engineering field, 3 year course into Construction, Engineering and Design, 4 year course into Design, Life Science, Engineering and Construction. Referring to a Classified table of majors and fields by KIID, I reorganized them into ten big categories: (1)Design Theory (2)Design Technique (3)Interior Composition Elements (4)Basic Practice (5)Advanced Practice (6)Psychology and Behaviour (7)Design Management (8)History of Interior Design (9)Digital Design (10)Communication. The afore-mentioned ten curriculum categories show characteristics formed by composition in each school system. The curriculum categories in school system had differences in composition depending on each field. By examining similarities and differences among them, I concluded attributes of each field. I hope the result of this study can contribute to consistent study to establish and develop the academic identity of Interior Design.

• Journal of the Korean Society of Clothing and Textiles
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• v.36 no.8
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• pp.849-859
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• 2012

This study contributes to the development of a creative fashion design and provides concrete data regarding the process of creative ideas through an analysis of the characteristics of the fashion design idea and the characteristics of fashion design from a formative perspective according to Osborn's checklist method. The data collection involved 466 pages that focused on the work of 30 designers (2005 S/S-2009 F/W) extracted from the websites style.com and ifb.co.kr. In the cases of pictures collected, a content analysis was applied based on statistical analysis and design analysis criteria. First, as a result of the examination of the characteristics of ideas for fashion design based on the checklist, it turned out that elimination method is most frequently employed, followed by addition, conversion, limit and combination. In addition, every idea showed a significant difference in terms of the applied item, expression method, and balance. Second, due to the study of the formative characteristics of fashion design (based on the checklist), it turned out that square-shaped silhouette, achromatic and chromatic colors, combined tones, identical color combination, complex texture, and identical texture combination are frequently used. In addition, every idea showed a significant difference in terms of form, color, and fabric. We believe that the use of the checklist is useful for the development of a creative design because formative characteristics vary based on the characteristic of ideas of fashion design.