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남상운,허연정,심옥자,심상일,이호상 안성산업대학교 1998 論文集 Vol.30 No.-
This study was carried out to investigate energy saving effect and thermal insulation characteristics of double film water curtain system during the coldest season in greenhouse. A double film water curtain system is a ground water spraying system between double layered plastic film, and it is able to make uniform water curtain. The experimental greenhouses were plastic greenhouses of two types. A type-Ⅰ was a two-thirds arched shape and its area was 350㎡ . A type-Ⅱ was a triangle shape and its area was 190㎡. Both greenhouses were cultivated with cactus. The minimum outside air temperature ranged was -2.6 to -16.7℃ and nocturnal ambient mean temperature was -6.5℃. The experimental greenhouses have maintained the air temperature above 2℃ of type-Ⅰ and 8℃ of type-Ⅱ. The ground water spraying flow rates of these greenhouses were 7.0ℓ/㎡hr of type-Ⅰ and 4.3ℓ/㎡hr of type-Ⅱ. The overall heat transfer coefficient of type-Ⅰ greenhouse was calculated at 1.97 kcal//㎡hr℃ and type-Ⅱ was 1.44 kcal/㎡hr℃. The energy saving rate of type-Ⅰ greenhouse was estimated and 78.1% and type-Ⅱ was 98.9%.
吸入 空氣의 濕度가 Diesel cycle의 性能에 미치는 影響에 關한 理論的 考察
장성운 忠州大學校 2007 한국교통대학교 논문집 Vol.42 No.-
For calculating theoretical thermal efficiency of Diesel cycle in internal combustion engine, Theoretical thermal efficiency is decided by compression ratio. Compression ratio of internal combustion engine is calculated by stroke volume and clearance volume. The air of stroke volume is constant to the engine mechanism. Air temperature of clearance volume increases adiabatic compression. The moisture in intake air is evaporating by the temperature of adiabatic compression. Moisture evaporating is increased volume in the clearance volume after adiabatic compression. Clearance volume is the intake air and the steam of moisture evaporating. The result, compression rate is increased and thermal efficiency is changed. For calculating, Absolute humidity of intake air increase 0, 5, 10, 15, 20, 25, 30.% The result were as follows. 1, Increase the absolute humidity of intake air in Diesel cycle, moisture is changed to super heated steam by evaporating and increased the volume in the clearance volume and changed compressing rate after adiabatic compression. 2, Pressure increase after adiabatic compression improves the power of engine. 3, The high compressing rate increases thermal efficiency in Diesel cycle. 4, If the moisture increasing mechanism is applied to the intake air, engine power and thermal efficiency is increased and engine is effected a little big size.
장성운 忠州大學校 2009 한국교통대학교 논문집 Vol.44 No.-
All the world war of the energy. Energy is the resources of national. All the national try to secure of energy. Fossil fuels is drained gradually in the world. But, the world population use energy for comfortable life. The style of energy use is heating, electric generation, vehicle etc. The theoretical efficiency of heat engine is about 45%, and actual efficiency is about 26%. The energy loss of 55% give off to the air and the rest is mechanical energy loss. The heat energy give off to the air is the chief criminal of earth warm. In the steam power plant, The heat energy give off to the air is using for heating warm water. Warm water is supply to home. But heat engine of car, The heat energy give off to the air can not use. The reason, heat engine of car is moving In this study, For electric generating use thermo-electric element. Thermo-electric element is generating the electric from the heat energy give off to the air in car engine. The results are as follows. 1. using thermo-electric element, electric generating is possible from the heat energy give off to the air in car engine exhaust gas. 2. In the experimental equipment, A piece of thermo-electric element is generating of electric 0.2W-3.2W to the temperature range 50℃-290℃. 3. 200 pieces thermo-electric element can apply to the car exhaust gas muffler and can generating of electric 160W-300W. 4. Recharge the generating electric to the battery of car, The generator power of car is decrease about 1/3 and increase car engine power.
Sang‑Wook Kim,Hyeon‑Woo Son,Taek‑Kyun Jung,Young‑Bum Chun,Yi‑Hyun Park,Ji‑Woon Lee,Soong‑Keun Hyun 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.4
The hot deformation behavior of advanced reduced-activation alloy (ARAA) was investigated using hot torsion tests. Thefl ow stress decreased as deformation temperature increased and as strain rate decreased. The fl ow behavior demonstratedthe typical dynamic recrystallization (DRX). Based on the constitutive analysis of peak stress, the activation energy for hotdeformation was found to be 330.3 kJ mol −1 . Peak stress was analyzed as a function of the Zener–Hollomon parameter, andcalculated and experimental values were in good agreement. A DRX kinetic model for ARAA was derived with deformationconditions based on the Avrami-type model. It was confi rmed that the volume fraction of dynamically recrystallized grainsincreased as deformation temperature increased and as strain rate decreased. The necklace structure and grain boundarybulging were observed in the deformed microstructure of ARAA. The suggested DRX mechanism for ARAA during hotworking is discontinuous DRX.
게놈 유형이 다른 무릇(Scilla scilloides comlpex)에서 FISH를 이용한 인 우성 다양성 분석
이상은,최혜운,방재욱 충남대학교 생물공학연구소 2004 생물공학연구지 Vol.10 No.2
Nucleolar dominance, an epigenetic phenomenon in which one parental set of ribosomal RNA gene is silenced in an interspecific hybrid, was investigated in different cytotype plants of Scilla scilloides complex; AA, BB, AABB, ABBB, BBBB and AABBB. To determine the loci of the nucleolar organizer regions (NORs) in metaphase chromosomes, physical mapping of 45S rRNA gene (3.8 Kb) using FISH method was applied. Two signals of the 45S rRNA gene loci were observed in both the cytotypes of AA (2n=16) and BB (2n=18). Four signals were found in tetraploid BBBB, while two and three signals were found in cytotypes of AABB and ABBB, respectively. However, AABB plants in the population of Daegukhul-do Island had four NORs in both the A and B genome. Four signals were found in pentaploid AABBB plants. The different numbers of 45S rRNA gene signals suggested the phenomenon of nucleolar dominance or amphiplasty among different cytotype plants of S. scilloides. It is speculated that inactivation of NORs on a2 chromosome in the cytotype AABB plants is the result of the amphiplastic suppression between A and B genomes.