• Title/Summary/Keyword: 분사지식

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An Analysis of Elementary Teachers' Knowledge of Fraction (초등교사의 분수 지식 실태 분석)

  • Lee, Jong-Euk
    • The Mathematical Education
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    • v.44 no.1 s.108
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    • pp.67-85
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    • 2005
  • This study investigated elementary teachers' subject matter knowledge and pedagogical content knowledge of fractions. The subject for data collection were 12 in-service elementary teachers and data were collected through written test problems. The finding imply that most elementary teachers understand fraction construct as part-whole, show low level of understanding of operator, ratio, and measurement constructions and word problem posing, using models, and developing the algorithms to divide fractions. The research results indicates that experienced teachers possess poor knowledge of fractions against novice teachers.

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Comparative analysis for lateral movement each type of W/jet propeller using SHS (분석SHS를 이용한 W/Jet 추진기 유형별 횡이동 비교 분석)

  • Yun, Cheong-Geum;Park, Jae-Hong;Jeong, Chang-Hyeon
    • Proceedings of KOSOMES biannual meeting
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    • 2017.04a
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    • pp.89-89
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    • 2017
  • 해양경찰 소형 경비정에 주로 장착되었던 물분사(water jet type) propeller가 중대형 경비함으로 점차 확대되고 있으며, 축 형식은 2~4축, 유동을 제어하는 bucket 유형도 DRB, CSU(SRB) 방식으로 나뉘어져 있다. 그러나, W/Jet 추진기 고유의 운동 특성이 반영된 조함법의 연구가 부족한 편이다. 여기서는 함정에 장착된 W/Jet 유형별 SHS를 통하여 직접 구현해 보고, SHS 구현이 현실적으로 어려운 함정은 해양경찰 함정장들의 면담을 통하여 습득한 것을 이론적으로 구현 제시하여, 함정 조함시 지식적인 인적오류를 최소화하여 W/jet 추진기가 장착된 함정 승조원의 조함 능력 향상 및 안전운항에 기여하고자 한다.

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Knowledge and Technology Transfer of University and Regional Development: A Case Study of Chonnam National University (대학의 지식 및 기술이전과 지역발전: 전남대학을 사례로)

  • 안영진
    • Journal of the Economic Geographical Society of Korea
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    • v.6 no.1
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    • pp.171-191
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    • 2003
  • Today universities are regarded as one of the key institutions in the national and regional innovation systems. First of all the diffusion and distribution of the knowledges, technologies, information and know-hows from higher educations to regions are capable of promoting an innovation-led regional development. This study aims to evaluate the transfer and spatial diffusion of knowledge and technology from the Chonnam National University(CNU) in Kwangju to the regions and to focus the analysis of the technology transfer, personnel transfer and spin-off development. The results show that there are some differences in the spatial range and effects of the knowledge and technology transfer of the CNU by the type of transfers. And the Analysis provide evidence that the knowledge and technology distributions from the CNU make more and less positive contribution to regional developments.

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Empirical Analysis on the Cooling Load and Evaporation Efficiency of Fogging System in Greenhouses (온실의 냉방부하 및 포그시스템의 증발효율 실험분석)

  • Nam, Sang-Woon;Seo, Dong-Uk;Shin, Hyun-Ho
    • Journal of Bio-Environment Control
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    • v.24 no.3
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    • pp.147-152
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    • 2015
  • In order to develop the cooling load estimation method in the greenhouse, the cooling load calculation formula based on the heat balance method was constructed and verified by the actual cooling load measured in the fog cooling greenhouse. To examine the ventilation heat transfer in the cooling load calculation formula, we measured ventilation rates in the experimental greenhouse which a cooling system was not operated. The ventilation heat transfer by a heat balance method showed a relatively good agreement. Evaporation efficiencies of the two-fluid fogging system were a range of 0.3 to 0.94, average 0.67, and it showed that they increased as the ventilation rate increased. We measured thermal environments in a fog cooling greenhouse, and calculated cooling load by heat balance equation. Also we calculated evaporative cooling energy by measuring the sprayed amount in the fogging system. And by comparing those two results, we could verify that the calculated and the measured cooling load showed a relatively similar trend. When the cooling load was low, the measured value was slightly larger than calculated, when the cooling load was high, it has been found to be smaller than calculated. In designing the greenhouse cooling system, the capacity of cooling equipment is determined by the maximum cooling load. We have to consider the safety factor when installed capacity is estimated, so a cooling load calculation method presented in this study could be applied to the greenhouse environmental design.

Mechanism and Spray Characteristics of a Mini-Sprinkler with Downward Spray for Prevention of Drop Water (하향 분사식 미니스프링클러의 낙수방지 메카니즘과 살수 특성)

  • Kim, Hong-Gyoo;Chung, Sung-Won
    • Journal of Bio-Environment Control
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    • v.16 no.3
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    • pp.210-216
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    • 2007
  • A study was conducted to find mechanism and spray characteristics of a mini-sprinkler with downward spray to develop a new design type to be able to prevent drop water. The experiments were executed in a plastic greenhouse to minimize the effect of the wind. Data was collected at five different operation pressures and at 4 different raiser heights. Spray characteristics of the sprinkler such as effective radius, effective area, mean application depth, absolute maximum application depth, effective maximum application depth and coefficient of variation were determined. In order to analyze the mechanism and packing supporter of sprinkler, the numerical simulation using ABAQUS was performed. The optimum pressure for preventing drop water was determined.

A Study on the Design and Embodiment of Educational Automatic Purification Facility of Waste Water (교육용 자동 폐수 정화시설의 설계와 구현에 관한 연구)

  • Kim, Moon-Ki
    • The Journal of Korean Institute for Practical Engineering Education
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    • v.4 no.2
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    • pp.7-12
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    • 2012
  • In this research, an educational automatic purification facility of waste water is designed. The system has four functions which are filter tank, aeration tank, reactor tank and ultraviolet sterilization tank, and is embodied by PLC(Programmable Logic Controller), DC motor, solenoid valve, squirt gun, propeller, profile, switch, sensor and so on. Also, the system is designed and manufactured based on knowledges which are obtained from college education. The study is emphasized on "learning by doing". From this case study, students can increase their originality and adaptability for related industry. Also, the technique can be initiated industry if needed.

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Study on Internal Corporate Venture Business in Public Companies;Based on A Public Company (공공기관의 사내벤처제도 개선방안;A사 사례연구)

  • Lee, Jong-Keon;Lim, Chan-Soo
    • 한국벤처창업학회:학술대회논문집
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    • 2007.11a
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    • pp.111-140
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    • 2007
  • This paper was analyzed to improve internal corporate venture system in public companies. The problems of internal corporate venture systems in a public company were as follows: First, lack of the CEO's willingness in venture business was shown. The culture of venture business also was not mature; Second, the employees were behind the effort to develop their business ability; Third, the objective views are needed to screening venture items and evaluation; Fourth, to measure performance of internal corporate venture, a clear basis and measure system were needed. Fifth, the reward was restricted; Finally, the mother-company did not invest any money for the spin-outed ventures The results of the paper were as follows: First, the CEO's support and effusion of venture culture were needed for successful internal corporate venture system; Second, a public company has to provide education program for venture and information--sharing system; Third, outside consultant may be utilized in finding venture items and feasibility evaluation. Fourth, each venture team may be provided a clear object and specific evaluation system based on characteristic of each team; Fifth, performance-base reward system is needed to enhance motivation; Finally, the public company has to provide find for the spin-off venture by utilizing government system and forming venture capital funds.

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A Discourse-Pragmatic Study of Preposing and Inversion in English. (전치문과 도치문의 담화화용론적인 비교)

  • 박원경
    • Korean Journal of English Language and Linguistics
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    • v.3 no.1
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    • pp.37-54
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    • 2003
  • The purpose of this paper is to investigate the phenomena of preposing and inversion in English from the discourse-pragmatic perspectives. We claim that different types of preposing can be unified to a single process of topicalization. We also show that diverse discourse functions of inversion can be subsumed under the ‘linking’ function with the prior discourse. It is followed a comparative discussion between preposing and inversion to find what similarities the two constructions share and what differences there exist between the two. It is concluded that the choice of a syntactic forms ultimately depends on the speaker's evaluation of the information status of the knowledge store of the hearer.

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