• The Korean Journal of Mycology
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• v.8 no.3
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• pp.133-142
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• 1980

Poria cocos, a parasite on Pinus densiflora was studied for its optimum growing condition from May 1, 1979 to November 15, 1980. 1) The optimum pH value was 5.0, and it had poor growth below pH 3.0 and no growth above pH 7.0. 2) The optimum temperatures were $25{\sim}27^{\circ}C$, and it had poor growth below $5^{\circ}C$. 3) On Robbins and Herrey's solid media, malt extract(diameter of colony at 2% of the above material was 90mm) and tomato extract(at 8% was 90mm) gave the best growth. 4) By Badcock method, the best growth was obtained in P.D.A. supplemented with accelerator 5% of the above material of liquid media(85mm in diameter of colony) and malt extract 2% of P.D.A. added with accelerator 5% of them of liquid media(410mg of hyphae of dry weight) but the growth rate was poor in the media of wood extract agar supplemented with accelerator 5% of the above material giving 30mm diameter of the colony. 5) The growth on Robbins basal medium supplemented with Quercus accutissima extract showed 305. 3mg of hyphae of dry weight and Robinia pseudoacasia was supplemented with it showed 256.3mg of them. 6) The best growth was obtained in Jennison basal medium supplemented with L-asparagine showing 44.3mg of hyphae of dry weight.

• Journal of Bio-Environment Control
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• v.14 no.1
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• pp.1-6
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• 2005

A multipurpose operating system was developed to adjust both spray times and ventilation method without a configuration of the moving path and the type of the greenhouse. The multipurpose working system proved to be a reliable system for testing the growth quality of the fruit vegetables in the greenhouse. The results are as follows. The first leaf, diameter of a stem, leaf area, and average stem diameter in the Cucumber seedling growth were repressed by high-speed ventilation, but was not repressed by spray times. The first leaf in the Tomato seedling growth was repressed as ventilation velocity was high, but the average stem diameter was not repressed. While the Tomato was given water three times a day, the diameter of a stem and the leaf area were increased as ventilation speed became higher. However, those were different other factors. The Tomato leaf area was larger when given water twice a day than that in hand spray, but showed no difference with ventilation speed. The first leaf, the diameter of a stem and the leaf area of a Red pepper were lower in automatic spraying with ventilation than those in hand spray.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.4
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• pp.324-329
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• 2020

The emergency evacuation support system provides a safe means of evacuation by preventing the inflow of smoke through the formation of a smoke shield curtain in fire situations and pressurizing fresh air to the inside of the smoke shield curtain. In this study, numerical analysis was performed to examine the effects of the hole size on the flow inside the smoke curtain. As the air supply size decreased, the flow rate through the air supply was formed relatively uniformly from the inlet to the outlet length of the emergency support system. In addition, the size of the air supply hole was more than 20 mm, the flow rate was very low near the outlet, so the air supply hole size should be smaller than 20 mm. In addition, the minor loss of the air supply hole was calculated to be K = 1.5 from the numerical results. Therefore, the proper design of an emergency evacuation support system is possible using the flow characteristics according to the size and minor loss of the air supply hole.

• Sijohaknonchong
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• v.20
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• pp.197-215
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• 2004

In this paper, I reexamined the word 'Sijo-samjang(시조삼강)' and gave a new meaning of it. In addition, I proposed the new concept of 'Sijo-samjang' which meant the characteristic of a Pyon'ga(편가) in Sijo-chang(시조창). For a long time, 'Sijo-samjang' was regarded as a word which indicated the three sections of a Sijo. It was because of the fixed idea that a Sijo was always composed of a form separated by three parts. Unlike the fixed idea, I found the fact that 'Sijo-samjang' meant singing successively three different Sijos which adapted three different music by reexamining the actual uses of the word in the texts of the days. Thus, I could come to a conclusion that 'Sijo-samjang' was the word indicating a specific music system of a Sijo-chang(singing a Sijo) corresponding to a Pyon'ga of a Gagok(가곡). 'Sijo-samjang' seemed to be molded up while the music of Sijo-chang developed. Usually, a successive singing of the three different Sijos, such as Pyong-sijo(평시조), Chirum-sijo(지름시조), and Sasol-sijo(사설시조), was called 'Sijo-samjang'. However, some of the three could be omitted, and some of it could be substituted by a derived song. This kind of a usual and a derived form seemed to be settled as an important custom of singing a Silo after the 19 century. The main point of the development of music in Sijo-chang was having the characteristic of compilation which meant singing Pyong-sijo, Chirum-sijo, and Sasol-sijo successively. 'Sijo-samjang' was the concept which explained this kind of characteristic and was one of the key words to understand the development of Sijo-chang.

• Korean Chemical Engineering Research
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• v.57 no.5
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• pp.628-636
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• 2019

In various industrial processes, piping serves as a link between unit processes and is an essential installation for internal flow. Therefore, the optimum design of the piping system is very important in terms of safety and cost, which requires the estimation of the pressure drop, flow rate, pipe size, etc. in the piping system. In this study, we developed a software that determines pressure drop, flow rate, and pipe size when any two of these design variables are known. We categorized the flows into single phase, homogeneous two phase, and separated two phase flows, and applied suitable calculation models accordingly. We also constructed a system library for the calculation of the pipe material, relative roughness, fluid property, and friction coefficients to minimize user input. We further created a costing library according to the piping material for the calculation of the investment cost of the pipe per unit length. We implemented all these functions in an integrated environment using a graphical user interface for user convenience, and C # programming language. Finally, we verified the accuracy of the software using literature data and examples from an industrial process with obtained deviations of 1% and 8.8% for the single phase and two-phase models.

• Journal of the KSME
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• v.25 no.1
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• pp.9-22
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• 1985

재래의 표준기어방식으로는 여러 가지의 취약점이 있는데, 이러한 결점은 치형을 다시 교 정(correction)하는 전위기어방식으로 설계하여 성능이 개선되고 해결될 수 있다. Corrected tooth의 창성은 공구를 전위하여 절삭하므로 이루어지고, 이 방식은 치형곡선의 곡률반지름을 증가시키며, 미끄럼률을 감소시켜서 강도를 증가시키도록 설계할 수 있다. 본 해설에서는 전위 기어 영역에서 기어의 성능개선과 복잡한 강도의 설계방법등을 최근경향에 부합시키고 통일된 형식의 체계로 기어설계를 쉽게 발전시킬 수 있도록 시도한 것이다.

• The Magazine of the IEIE
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• v.31 no.6
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• pp.110-122
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• 2004

성덕대왕 신종은 서기 771년(신라 혜공왕 7년)에 완성된 것으로 성덕대왕의 공적을 기리기 위해 34년간 주조(높이 3.663m, 최대지름 2.227m, 무게 18.900kg, 7.7∼21.5㎝)하여 만든 세계적인 문화유산이다.(중략)

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2009.06a
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• pp.829-830
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• 2009

• The Science & Technology
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• v.28 no.11 s.318
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• pp.80-81
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• 1995

원시성 IRAS19550+3248발견하여 별의 형성과정을 규명하는데 기여한 구본철박사 구박사는 대덕에 있는 지름 14m의 우리나라 전파망원경으로 이 별을 찾아내 계속 관측 ,연구하여 이 별이 태양보다 1백50배 밝으며 아직은 모태된 분자운 깊숙이 파묻혀 있다는 것을 밝혀냈다.

• Proceedings of the SAREK Conference
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• 2005.06a
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• pp.150-150
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• 2005