• 한국소음진동공학회논문집
• /
• 제19권5호
• /
• pp.499-508
• /
• 2009

This paper focuses on the modelling of common rail diesel injector using the AMESim code and shows the appropriateness of the developed model. For the developed injector model, simulations are carried out to analyze the behavior characteristics of the injector for the variations of injector model parameters such as orifice diameters, rail pressures, and energizing times. Simulation results show that the diameters of inlet and outlet orifices have close relation with injection quantity. Increment of rail pressure and energizing time provides increment of injection quantity, and simulated energizing time map shows injection characteristics of the common rail injector.

• 전기학회논문지P
• /
• 제58권1호
• /
• pp.9-14
• /
• 2009

The modelling of PEMFC(Proton Exchange Membrane Fuel Cell) has been studied in many kinds of methods. But there are some limitations in application of the developed models to analyze transient phenomena of power systems. The PSCAD/EMTDC is very popular simulation tool in power system areas. To analyze power systems interconnected to PEMFCs, the PSCAD/EMTDC model of the PEMFCs is needed. In this paper, we developed a PSCAD/EMTDC model of PEMFC based on electro-chemical characteristic equations of PEMFC. Also, we performed simulations using the developed model in the PSCAD/EMTDC program and tested appropriateness of the proposed models. The simulations showed good results.

• 한국문헌정보학회지
• /
• 제45권2호
• /
• pp.41-60
• /
• 2011

The use of a practice perspective in the analysis of information literacy represents a shift in attention towards the enactment of information literacy as a social practice, and away from the information skills approach that has dominated information literacy research and education. The sociocultural perspective that underpins a practice-oriented approach highlights the role of practice and co-participation of the community in shaping the production, reproduction and circulation of knowledge, including knowledge about the appropriateness of information skills in relation to the context in which the skills are practised. This emerging view contrasts with the conventional approach to information literacy that has focused on the information skills of individuals as something that can be learned and transferred independently of context. This paper explores two questions: what is information literacy and, how does it happen? It then goes on to identify the implications of this approach for librarians and researchers.

• 한국초등과학교육학회지:초등과학교육
• /
• 제25권2호
• /
• pp.191-205
• /
• 2006

The purpose of this study was to explore strategies used by pre-service elementary science teachers in planning a science lesson. The participants were six senior students from a national university of education located in the midwestern area of Korea. Data regarding their planning strategies were gathered through both thinking-aloud and observation. Research findings suggest that: three of the teachers had little understanding of the necessity of reviewing unit contents or prior learning for planning a science lesson; five student teachers relied heavily on learning objectives presented in teachers' guidebooks without considering their appropriateness; all teachers exhibited an intention of composing different activities or teaching approaches from teachers' guidebooks; only two teachers thought about learners' prior knowledge or understanding levels; five and three teachers had poor understanding of discovery learning models and importance of teacher's questioning, respectively; and five teachers paid little attention to assessment.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2022년도 봄 학술논문 발표대회
• /
• pp.216-217
• /
• 2022

After the financial crisis, the spread of indirect employment, which is an outsourcing method, is gradually becoming common in our society, and the risk of harm is relatively high or the proportion of simple jobs is high. Simple workers have a higher proportion of non-manufacturing industries such as the service industry, and production workers are intensively used in the manufacturing industry. In Article 63 of the Occupational Safety and Health Act, contractors must take necessary safety and health measures. In addition, due to the expansion of the scope of contracts under the Occupational Safety and Health Act, it is necessary to review the appropriateness of industrial accident prevention measures and implementation standards.

• 대한기계학회논문집A
• /
• 제27권2호
• /
• pp.247-254
• /
• 2003

The paper presents the influence of spring dynamics and friction on dynamic responses in a spring-driven cam system. The characteristics of the friction on the camshaft are analyzed using the nonlinear pendulum experiment while the parameters of the friction model are estimated using the optimization technique. The analysis reveals that the friction of the camshaft depends on stick-slip, Stribeck effect and viscous damping. Spring elements are found to have much influence on the dynamic characteristics. Hence, they are modeled as four-degree-of-freedom lumped masses with equivalent springs. The appropriateness of the derived friction model and spring model is verified by its application to a vacuum circuit breaker mechanism of the cam-follower type.

• 디지털산업정보학회논문지
• /
• 제4권1호
• /
• pp.1-8
• /
• 2008

In the Web 2.0, besides more gaining information on the web, the number of web sites that take advantage of RSS increases explosively. Commonly each users search RSS channels through the web search engine before registering RSS channel's url to the RSS reader. Users judge whether the site is RSS channel or not and register an RSS channel's url through theirs interests. Because accomplished by users themselves, those processes conflict to user's convenience and quick consumption of information. Techniques of current search engines can't provide users with reliable RSS feed information as search results. In this paper, we analysis appropriateness of current search engines' techniques that offer users RSS feed search service and discuss their limitations. Also, we make up RSS feed database through classification of RSS tag being possible to search RSS feed information effectively and apply update rate of each RSS channel's feed to ranking algorithm providing more reliable search results.

• 한국조리학회지
• /
• 제14권3호
• /
• pp.69-84
• /
• 2008

The franchise business in Korea, having a relatively short history compared to those of the advanced countries, disclosed many problems between franchisors and franchisees due to a rapid growth in number for the short period of time. Having recognized these problems, the Korean government, responding to social demands, established "The Fair Trade Practices Law for Franchise Business" to restrict unfair trade practices and to develop a healthier franchise business practice in general. In this study, we closely examined how the franchisees' understanding of the related laws would influence the franchisees' countermoves and satisfaction and the franchisor's reactions from the franchisees' standpoints. In conclusion, the franchisees show higher satisfaction in heteronomous changes achieved by the mutual agreement with the franchisors rather than in autonomous changes achieved by their active pursuits, as seen from the interrelation of the franchisors' reactions and the appropriateness of franchise agreements.

• 약학회지
• /
• 제55권3호
• /
• pp.173-184
• /
• 2011

The purpose of this study was to review foreign retrospective Drug Utilization Review(DUR), and so to suggest a development plan suitable for use with domestic situation. Literature review of foreign retrospective DUR program and domestic project such as DUR and prescribing analysis project were reviewed. To improve prescribing quality, developed countries such as US, Canada, UK, France, and Australia have implemented various forms of policy. Based on the review of foreign retrospective DUR program, we suggested to apply practical implementation of retrospective DUR program.

• 대한가정학회지
• /
• 제38권6호
• /
• pp.1-13
• /
• 2000

The purpose of the study was to investigate the relationships between parents'attitudes toward emergent literacy and home literacy practices with toddlers and preschoolers. The researcher developed the instrument based on a literature review and on other researchers'(Fitzgerald, Spiegel, & Cunningham, 1991; DeBaryshe & Binder, 1994) questionnaires for parents of toddlers and preschoolers. The researcher did a pilot study to examine the appropriateness of the questionnaires with 68 parents. A total of 274 parents who sent their children to daycare centers participated in this study in central Pennsylvania. To analyze the data for this study, The researcher employed Frequency, Mean, Standard Deviation, Pearson's correlations, Multiple Regression Analysis. Demographic characteristics and parents'attitudes toward emergent literacy which consisted with writing and reading attitudes of literacy were related to home literacy practices for toddlers and preschoolers.. Writing attitudes and verbal participation in reading were the most predicting variables in home literacy practices. The results of this study addressed the importance of the role of belief systems in literacy teaming between parents and children.