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알루미늄 다채널 평판관내 R-22 및 R-410A 응축에 관한 연구
정호종,김내현,윤백,김만회,Jung, Ho-Jong,Kim, Nae-Hyun,Yoon, Baek,Kim, Man-Hoi 대한설비공학회 2002 설비공학 논문집 Vol.14 No.7
In this study, condensation heat transfer tests were conducted in flat aluminum multi-channel tubes using R-410A, and the results are compared with those of R-22. Two internal geometries were tested; one with a smooth inner surface and the other with micro-fins. Data are presented for the following range of variables; vapor quality (0.1~0.9), mass flux (200~600 kg/$m^2$s) and heat flux (5~15 ㎾/$m^2$). Results show that the effect of surface tension drainage on the fin surface is more pronounced for R-22 than R-410A. The smaller Weber number for R-22 may be responsible. For the smooth tube, the heat transfer coefficient of R-410A is slightly larger than that of R-22. For the micro-fin tube, however, the reverse is true. Possible reasoning is provided considering the physical properties of the refrigerants. For the smooth tube, a correlation of Akers et at. type predicts the data reasonably well. For the micro-fin tube, the Yang and Webb model was modified to correlate the present data.
유입부하 변동에 따른 Bio-Sac 생물반응조의 최적 송풍량 결정에 관한 연구
정호종(Jung, Hojong),정민재(Jung, Minjae),최한영(Choi, Hanyong) 한국방재학회 2017 한국방재학회논문집 Vol.17 No.4
설계인구보다 증가된 인구에 따라서 하수처리장에서는 설계수질과 유입수질간에는 많은 차이가 있으며, 설계 유입수 농도보다 초과로 유입이 된 하수처리장은 적정운전에 많은 곤란함을 겪고 있다. 그런데 Bio-Sac공법은 설계대비 초과된 유입 BOD, SS, T-N에 의해 하수처리장에 대해서는 국⋅내외 선행 연구가 많이 부족하고, 미흡한 실정이다. 본 연구의 목적은 성남판교수질복원센터를 대상으로 설계초과되는 유입 BOD, SS, T-N 변동에 따른 생물반응조의 송풍량 조절을 통해 질산화, 탈질화 반응의 의한 최적의 송풍량을 선정하기 위한 연구이다. 생물반응조 호기조 송풍량 40, 50 및 60 Nm3/min으로 변경하여 실험한 결과50 Nm3/min일 때 질소제거율 92.8% 질산화율 96.9% 탈질화율 94.3%로 나타났다. 질소제거율과, 탈질율을 고려할 때 최적의 송풍량은 50 Nm3/min일 때 처리효율이 효과적이라는 결과를 얻었다. There are many differences between the design water quality and the influent water quality at the sewage treatment plant, depending on the population that is larger than the design population, and the sewage treatment plant which has flowed in excess of the design influent concentration suffers from the problem of proper operation. However, in the Bio-Sac construction method, there are insufficient prior researches on the sewage treatment plant due to excess BOD, SS, and T-N compared to the design. The purpose of this study is to select the optimal amount of ventilation by nitrification and denitrification through controlling the amount of blowing of bioreactor according to fluctuating influent BOD, SS, and T-N exceeding the design for Seongnam Pangyo water quality restoration center. Experiments were conducted at 40, 50 and 60 Nm3 / min ventilation rate of the bioreactor. The nitrogen removal rate was 92.8%, the nitrification rate was 96.9%, and the denitrification rate was 94.3% at 50 Nm3 / min. Considering the nitrogen removal rate and denitrification rate, the optimum treatment efficiency was 50 Nm3 / min.
정호종(Ho-jong Jeong),김정오(Jung-Oh Kim),김내현(Nae-Hyun Kim) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
Pressure drop experiments were conducted in flat extruded aluminum tubes -one with smooth inn and the other with micro-finned inner surface- using R-410A. For both tubes, the pressure drop the mass flux or the quality increased. The pressure drop also increased as saturation tempera The Friction data are well correlated by the Martinelli parameter with C=1.
수력직경이 작은 평판관내 R-22 및 R-410A 응축에 관한 연구
정호종(Ho-Jong Jeong),민창근(Chang-Keun Min),김내현(Nae-Hyun Kim),윤백(Baek Youn),김만희(Man-Hoe Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
In this study, condensation heat transfer tests were conducted in flat aluminum multi-channel tubes using<br/> R-410A, and the results are compared with those of R-22. Two internal geometries were tested; one with a<br/> smooth inner surface and the other with micro-fins. Data are presented for the following range of variables;<br/> vapor quality (0.1 ~ 0.9), mass flux (200 ~ 600 kg/㎡s ) and heat flux (5 ~ 15 kW/㎡). Results show that the<br/> effect of surface tension drainage on the fin surface is more pronounced for R-22 than R-410A. The smaller<br/> Weber number for R-22 may be responsible. For the smooth tube, the heat transfer coefficient of R-410A is<br/> slightly larger than that of R-22. For the micro-fin tube, however, the reverse is true. Possible reasoning is<br/> provided considering the physical properties of the refrigerants.
고성군 덕명리 일대 공룡 생흔 화석 산지의 자연탐사와 교재화를 위한 연구
백광석,정호종,서승조,정우규 晋州敎育大學校 科學敎育硏究所 1994 科學敎育硏究 Vol.20 No.-
경남 도내 고등학생들을 대상으로 실시한 고장 자연 탐사에서 덕명리 해안의 지질과 교육적 활용성을 조사한 결과는 다음과 같다. 1. 덕명리 해안의 지층은 진동층에 속하며 공룡과 조류의 족혼 화석, 연혼, 건열, 화성암의 관입 등의 관찰되고 해식애, 해식동, 해식대가 발달하였다. 2. 공룡 족혼 화석은 2족보행 공룡인 Theropod 와 Ornithopod 및 4족보행 공룡인 Sauropod의 것으로 추정되었다. 3. 본지역의 특징은 중학교 과학 및 고등학교 과학 I 하와 지구과학 교과의 침식 . 운반 . 퇴적작용, 지층과 화석, 지질시대의 환경과 생물, 우리나라의 지질 등의 단원에 좋은 야외 지질교재이다. 4. 내 고장 자연 탐사교육은 학생들에게 학습의 동기와 흥미를 유발시킬 수 있는 대단히 유요한 프로그램이었고, 설문 조사 등 분석결과에 의하면 과학 교육적 성과도 있었다.
HEMA와 CA 및 PVA공중합체의 막제조와 물성에 관한 연구
崔乘載,鄭皓鍾,鄭在均 단국대학교 1993 論文集 Vol.27 No.-
The grafting of 2-hydroxyethyl methacrylate(HEMA) and cellulose acetate(CA) and synthesis polymer poly(vinylalcohol) as a biocompatible material for medical application was investigated in the various condition. The structure of graft copolymer was indentified by using infrared spectroscopy.(IR) The membrane of sytnesis copolymer CA-g-p(HEMA) and PVA-g-p(HEMA) were prepared for a skin substitute and water content, tensile strength, elongation, water vapor transimmision rate(WVTR) and biodegradation the membranes was determind. And the surface structure of graft copolymer membrane characterized by SEM. The water content was about 100% and then tensile strength was 166∼661kg/㎠, 210∼88kg/㎠ at dry condition, 60∼328kg/㎠, 54∼23kg/㎠ at wet condition in the PVA-g-p(HEMA) and CA-g-p(HEMA) membrane respectively. Water vapor transimmision rate(WVTR) was 123.59∼128.54kg/㎠/day like that of the normal skin. From the result of the biodegradation by protein hydrolysis pepsin the biodegradation rate was that at the 4∼5day and accessed to the equilibrium state. From the results obtained in this study, syntheis membrane was found to satisfy most of the basic properties of a skin substitute.
김내현,정호종,조진표,최국광,Kim, Nae-Hyeon,Jeong, Ho-Jong,Jo, Jin-Pyo,Choe, Guk-Gwang 대한기계학회 2001 大韓機械學會論文集B Vol.25 No.12
In this study, convective boiling tests were conducted for enhanced tube bundles. The surface geometry consists of pores and connecting gaps. Tubes with three different pore sizes (d$_{p}$ = 0.20, 0.23 and 0.27 mm) were tested using R-123 and R-l34a for the following range: 8 kg/m$^2$s G 26 kg/m$^2$s, 10 kW/m$^2$ q0 40 kW/m$^2$and 0.1 $\chi$ 0.9. The convective boiling heat transfer coefficients were strongly dependent on heat flux with negligible dependency on mass flux or quality. For the present enhanced geometry (pores and gaps), the convective effect was apparent. The gaps of the present tubes may have served routes for the passage of two-phase mixtures, and enhanced the boiling heat transfer. The convective effect was more pronounced at a higher saturation temperature. More bubbles will be generated at a higher saturation temperature, which will lead to enhanced convective contribution. The pore size where the maximum heat transfer coefficient was obtained was larger for R-l34a (d$_{p}$ = 0.27 mm) compared with that for R-123 (d$_{p}$ = 0.23 mm). This trend was consistent with the previous pool boiling results. For the enhanced tube bundles, the convective effect was more pronounced for R-134a than for R-123. This trend was reversed for the smooth tube bundle. Possible reasoning is provided based on the bubble behavior on the tube wall. Both the modified Chen and the asymptotic model predicted the present data reasonably well. The RMSEs were 14.3% for the modified Chen model and 12.7% for the asymptotic model.model.