• 한국기계연구소 소보
• /
• s.20
• /
• pp.41-48
• /
• 1990

Electro-pneumatic valves are an electro-mechanical device which convert electric signal into pneumatic flow rate or pressure signal. Recently, the development tendency of electro-pneumatic valve is to make the valve with more compact and less electric power consumption style. To make the valve such as a style, the role of solenoid part is very important. This paper is used in the finite-element method for the purpose of evaluating the magnetic property of solenoid and analyze flux distribution of solenoid theoretically. From flux contour line which is obtained by numerical analysis, it verified that the plunger shape and physical property of solenoid part have influence on saturation phenomenon and leakage of magnetic fluxs. This paper made an experiment on the measurement of dynamic response time and force in order to confirm the propety of analytic result, and confirmed a good agreement between analysis results and experiment results.

• Proceedings of the KIEE Conference
• /
• 2007.07a
• /
• pp.214-215
• /
• 2007

Int this paper, we studied the analysis on long-term durability and output power characteristics of PV modules by variation on local thermal property. Using 5 modules(80W), we measured the maximum output power change during the test period. And the optical transmittance of glass was compared with PV module's maximum power fluctuation. The external environment change effected contamination on the entire or local surface of module. This caused the local temperature variation of each solar cell on PV module. The specific analysis is shown in the following paper.

• Journal of the Korean Institute of Educational Facilities
• /
• v.19 no.6
• /
• pp.16-20
• /
• 2012

• Proceedings of the Materials Research Society of Korea Conference
• /
• 1996.11a
• /
• pp.37-37
• /
• 1996

• Proceedings of the Korean Radioactive Waste Society Conference
• /
• 2018.11a
• /
• pp.241-242
• /
• 2018

• Science of Emotion and Sensibility
• /
• v.10 no.2
• /
• pp.177-186
• /
• 2007

The purposes of this study were to investigate consumer's needs for golf wear and to suggest a direction of product development and planning, based on the analysis of golfer's needs. The subjects used for the research were 150 male and female golfers who were in golf practice fields. The data were analyzed by frequency analysis, factor analysis, ANOVA, t-test and Duncan test. In summary, the results of this study were as followers; Dimensions of consumer's needs for golf wear were extracted from factor analysis as following properties; fashion/design property, textile property, hygiene property, body-shaped property. The most important consumer's need for golf wear was "wearing comfort" and second one was "moisture absorbency" Respondents evaluated that wearing comfort, stretchability, tactile, size of golf wear were very important but price, pilling, shrinkage or color-fading after laundry of golf wear were relatively less important. The evaluation of consumer's needs for golf wear according to demographic information had significant difference. The female golfers were found to consider that fiber characteristics, easy-to-laundry, wrinkle resistance, stretchability, sewing quality were relatively more important, when compared with the male golfers. Also, There were significant differences on the evaluation of consumer's needs for golf wear on fiber characteristics, stretchability, brand name between age groups.

• Journal of the Korea Convergence Society
• /
• v.11 no.7
• /
• pp.259-272
• /
• 2020

In fostering dynamic, innovative SMEs, hidden champion companies can be an appropriate model for SMEs to learn the success factors. On the other hand, the need for intellectual property management is becoming important as the value of a company is changing from a financial asset to an intellectual property. Therefore, in this study, the patent portfolio analysis of the hidden champion companies mentioned in Herman Simmon's book "Hidden Champion" was performed. As a result of the analysis, it was confirmed that patents are not possessed or patent activities are actively carried out and a differentiated intellectual property management strategy is implemented to improve patent quality depending on the characteristics of the technology possessed. The results of these studies can be used as basic data to prepare an intellectual property management strategy for companies that want to create opportunities to acquire monopoly rights and reduce patent maintenance and management costs. In addition, in this study, the patent IPC analysis verified that Herman Simmon's claim that "Hidden champions have the ability to focus on core competencies and focus on one technology" is valid.

• Earthquakes and Structures
• /
• v.11 no.2
• /
• pp.297-313
• /
• 2016

A virtual parameter is introduced into the formulation of the previously published integration method to improve its stability properties. It seems that the numerical properties of this integration method are almost unaffected by this parameter except for the stability property. As a result, it can have second order accuracy, explicit formulation and controllable numerical dissipation in addition to the enhanced stability property. In fact, it can have unconditional stability for the system with the instantaneous degree of nonlinearity less than or equal to the specified value of the virtual parameter for the modes of interest for each time step.

• Journal of Korea Technology Innovation Society
• /
• v.1 no.2
• /
• pp.153-164
• /
• 1998

This study attempts to provide policy makers and other interested parties with policy implications throughout an economic analysis of software sector. Chapter 2 is designed to provide an overview of market characteristics in the software sector. Chapter 3 reviews an overview of the evolution stage of the software industry and the effects these trends have on firm strategies. Chapter 4 reviews the relationships between software economic characteristics and intellectual property rights. Some suggestions are offered in the conclusion, with special attention given to an examination of market characteristics, firm strategies, government policies, and some economic factors.

• Proceedings of the KIEE Conference
• /
• 2011.07a
• /
• pp.2060-2060
• /
• 2011

This paper was investigated the frequency property for optimal operating conditions of mono-crystalline Si solar cell. An internal impedance of mono-crystalline Si solar cell was influenced frequency. An optimal operating conditions of solar cell was under about 10[kHz].