• The Transactions of the Korean Institute of Electrical Engineers B
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• v.55 no.7
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• pp.369-373
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• 2006

In this paper, an optimal method for determining design parameters of a Switched Reluctance Motor is researched. The dominant design parameters are stator and rotor pole arc and switching on and off angle. The parameters affecting performance are examined and selected using evolutionary computations and commercial CAD program. The simulated design method is compared with conventional procedure.

• The KSFM Journal of Fluid Machinery
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• v.4 no.2 s.11
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• pp.7-14
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• 2001

Design and development of a propeller fan for a cooling tower have been accomplished by both numerical prediction of performance and experimental validation with a wind tunnel. Main interest lies on blade geometry of a fan for optimal design of aerodynamic performance. A commercial program, Fine/Turbo used for the present numerical estimation, gives us engineering information such as flow details near the blades and flow rate of the system. The numerical results are compared with precise experimental output and show good agreement in comparison between the two data. Also new proposed model of a blade shows improved performance relative to present running model in market.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 1995.03a
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• pp.34-39
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• 1995

To reduce the shock in shifting the clutches and the brakes in automatic transmission have to be connected smoothly and disconnected rapidly. It is PCSV(Pressure Control Solenoid Valve) that play this role of automatic transmission. In this paper there were two steps in the analysis of the PCSV. The first step was modeling the elctromagnet by the permeance method. The second step was modeling the hydraulic circuit by the pressure differential equation. In addition to this modeling a experiment was performed and the commercial package program was used in order to justify modeling. The result of modeling coincide with the result of experiment and commercial package program. As a result this modeling is usable in analysis of dynamic characteractic of the PCSV.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2000.10a
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• pp.489-494
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• 2000

In the high speed driving conditions, the vibrational phenomena with relation to chassis system are becoming more important factors in chassis design and development. In this paper Commercial Dynamic program is used to model middle size bus for brake judder phenomenon. To verify the effects of a body structure in brake judder, body structure is modeled in flexible. Also mode shapes and frequencies are obtained from Commercial FEA program in the same condition of experimental test. The simulation results are compared to the experimental results and summarized

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2001.11b
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• pp.1394-1399
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• 2001

The purpose of this paper is that investigates the dynamic behavior characteristic of W.T.S(Wind Turbine System) and carries out the evaluation analysis during operating W.T.S. To investigate the dynamic behavior characteristic of W.T.S. the experiments to measure vibration of the blade from the attached accelerometer on the flap and edge section of the blade that is one of the most important elements of dynamic characteristic of W.T.S are performed. Natural frequency and mode shape are calculated with commercial program (STAR MODAL) using the measured vibration acceleration that receives the signal with F.F.T Analyzer from the accelerometer. For validation of these experiments. the finite element analysis is performed with commercial F.E.M Program (ANSYS) on the basis of the natural frequency and mode shape. The results indicate that experimental values have good agreements with the finite element analysis.

• Journal of Positioning, Navigation, and Timing
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• v.8 no.1
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• pp.1-12
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• 2019

In this paper, we implement a navigation software of a Global Navigation Satellite System (GNSS) receiver based on a commercial purpose GNSS software receiver platform and verify its performance by performing experimental tests for various GNSS signals available in Korea region. The SX3, employed in this paper, is composed of an application program and a Radio Frequency (RF) frontend, and can capture and process multi-constellation and multi-frequency GNSS signals. All the signal processing procedure of SX3 is accessible by the receiver software designer. In particular for an easy research and development, the Application Programing Interface (API) of the SX3 has a flexible architecture to upgrade or change the existing software program, equipped with a real-time monitoring function to monitor all the API executions. Users can easily apply and experiment with the developed algorithms using a form of Dynamic Link Library (DLL) files. Thus, by utilizing this flexible architecture, the cost and effort to develop a GNSS receiver can be greatly reduced.

• Journal of the Korean Society for Precision Engineering
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• v.12 no.8
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• pp.122-130
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• 1995

To reduce the shock in shifting, the clutches and the brakes in automatic transmission have to be connected smoothly and disconnected rapidly. It is PCSV(Pressure Control Solenoid Valve) that paly this role of automatic transmission. In this paper, there were two steps in the analysis of the PCSV. The first step was modeling the elctromagnet by the permeance method. The second step was modeling the hydraulic circuit by the pressure differential equa- tion. In addition to this modeling, a experiment was performed and the commercial package program was used in order to justify modeling. The result of modeling coincide with the result of experiment and commercial package program. As a result, this modeling is usable in analysis of dynamic characteristics of the PCSV.

• Journal of the Korean Society for Precision Engineering
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• v.12 no.12
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• pp.81-90
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• 1995

Anti-lock Brake System has been developed to reduce tendency for wheel lock and improve vehicle control during sudden braking on slippery road surfaces. This is achieved by controlling the braking pressure avoiding wheel lock, while retaining handling and brake performance. This paper is concerned about characteristics of a solenoid valve in hydraulic modulator for controlling brake pressure. First, it was modeling the electromagnet by the permeance method. Second, it was modeling the commercial Maxwell poackage program. And then, a experiment was performed in order to justify modeling. The result of modeling coincided with teh result of experiment and commercial packabe program. As a result, these modelings will be able to use in analysis of dynamic character- istics of the solenoid valve for braking.

• Korean Journal of Community Nutrition
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• v.14 no.3
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• pp.306-315
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• 2009

The purpose of this study was to compare the status of sanitation education and sanitation knowledge in school foodservice with commercial foodservice. The survey sample was institutional foodservice directors (n = 88) in A office of education and commercial foodservice directors (n = 81) in B foodservice industry. The questionnaire requested information about demographic information, situation of sanitation education, contents of sanitation education practice, importance of sanitation education, and sanitation knowledge. Data were analyzed using frequencies, means, chi-square test, and t-test. Over half (52.1%) of the respondents were institutional foodservice directors, 47.9% of the respondents were commercial foodservice directors. The majority of institutional foodservice directors were 25-29 years of age (38.6%), over 10 years of working experience (63.6%) and commercial foodservice directors were 25-29 years of age (53.1%), 5-10 years of working experience (35.0%). 66.3% of the respondents were educated food safety once a month, but 8.6% of commercial foodservices were never educated. The majority of the respondents used printing materials (73.3%) or lecture (74.8%). The importance level of institutional foodservice directors about sanitation education was significantly higher than commercial foodservice directors. The average score of institutional foodservice directors' sanitation knowledge was 87.05/100.00. The commercial foodservice directors' sanitation knowledge 67.74 was significantly lower than institutional foodservice directors (p < 0.05). Therefore, there should be a systematic education program designed for commercial foodservice directors.

• THE INTERNATIONAL COMMERCE & LAW REVIEW
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• v.48
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• pp.79-100
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• 2010

To promote the nation's exports, in Korea several government led programs are alive for procuring and manufacturing goods for export. The trade supporting programs are consisted of Trade Financing Program, Trade Tax Program, and Trade Insurance. The programs are summarized ; First, Trade Financing Program is available to exporters of procuring raw materials and finished goods for export. It is extended with exceptionally low interests from the Korean commercial banks. Second, Trade Tax Program provides whole or part of customs drawback to exporters. customs drawback is' made when exporters meet requirements of Customs for export. Third, Trade Insurance Program cover risks of uncertainty which is beyond the exporters' capacity at low insurance premium. It is suggested that the exporters have deep knowledge of these three programs to their ends. Especially Trade Financing Program and Trade Insurance Program can be a combined work for the financially weak SMEs. Further, there are rooms for these programs to develop to enhance the competitiveness of SME exporters.