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혐기성 소화의 동력학적 해석 : 有機酸 構成比에 따른 嫌氣性 消化 Anaerobic digestion with Component ratios of organic acids
노기현,장성호,안종수,전기일,김수생 동아대학교 환경문제연구소 1994 硏究報告 Vol.17 No.2
This research on organic acid and its component ratio (H_(AC) : H_(pt) : H_(Bu)) mainly produced in acid formation steps of anaerobic treatment process. From comparing the above experimental results with digestion efficiency of acetic acid used as substrates, I can find the conclusion as follows : 1. Removal efficiency for component ratios of organic acid is 64.3-98.6%, 59.6-98.2 %, respectively, varied with HRT of 3-20 days. 2. For l0days of HRT, in order to investigate the effects of component ratio of organic acid, when its component ratio(H_(ac) : H_(pt) : H_(bu)) is 100 : 0 : 0, 50 : 25 : 25, 28 : 38 : 34 and 0 : 50 : 50(as COD), respectively, effluent concentration is 464mg/l, 666mg/l, 832mg/l and 1,148mg/l, respectively. 3. Component ratio of menthane gas for organic acids represents 55-70%, with variation o: HRT, 3-20days. 4. When the component ratios of organic acid(H_(ac) : H_(pt) : H_(bu)) is 50 : 25 : 25 and 23 : 38 : 34(as COD), methane production per COD removal for HRT of 3-20days is 0.27~0. 32, 0.21~0.30. 5. From the mass balance relationship, when the component ratios of organic acid is 50 : 25 : 25 and 28 : 38 : 34(as COD), methane production ratio, varied with HRT of 3days, 5days, l0days, 15days and 20days in 49.6%, 66.4%, 77.5%. 85.1% and 89.7%, respectively and 39.1%, 56.3%, 68.3%, 76.3%, 83.9%, respectively.
베나르-레일라이형 열대류의 발생조건과 대류세포의 안정도
蘇鮮變,尹秦錫,金基石,羅基生,李敏子 공주대학교 기초과학연구소 2000 自然科學硏究 Vol.9 No.-
베나르-레일라이형 대류의 형태는 정상2차원, 정상3차원, 비정상3차원 대류로 구분되는데 본 실험은 대류의 발생조건과, 같은 점성의 유체에서 높이별 대류세포의 안정도, 그리고 대류의 운동형태가 각 점성에 따라 레일라이 수 및 프란틀 수에 얼마만큼 의존하는지 분석했다. 위 실험을 통해 다음과 같은 결론을 얻었다. 같은 점성에서 높이가 높아질수록 대류의 형태는 정상3차원 대류에서 비정상3차원 대류로 나타났다. 같은 점성의 유체에서 레일라이 수는 유체높이가 커짐에 따라 증가하고, 유체의 점성이 커질수록 감소하는 경향이 있다. 즉 프란틀 수가 증가할수록 레일라이 수는 감소한다. The form of convection of Benard Reyleigh type is devided into normal two dimension, normal three dimension and abnormal three dimension. This experiment analyzed the stability of convection-cell according to height in viscous fluid lilie the developemental condition of convection and how much the form of convectional movement depends on the Reyleigh number and pandtl number in proportion to each viscosity with the experimental equipment above. We had the following conclusion below from the experiment. In the same proportion of viscosity, the form of convection was changed from normal three dimentional convection to abnormal three dimensional one as the altitude gets higher. It incliues that the number of Ra increases as the heigher of fluids gets higher and that of decreases as the viscosity of fluids increases. In conclusion, the Reyleigh number decreases as the prandtl number.
Long-term Radiation Dose Reduction Plan of KHNP
Kim, Saeng-Ki,Shin, Sang-Woon,Lim, Byoung-Chan Korean Association for Radiation Protection 2003 방사선방어학회지 Vol.28 No.2
Annual radiation dose limit to radiation worker was substantially lowered in Korea by the adoption of 1990 recommendations of the International Commission on Radiation Protection (ICRP 60) in its legislation. On the other hand, radiation management environment in nuclear power plants is getting more worse because of the accumulation of radiation sources inside the system and the frequent need for maintenance according as the operation years of nuclear power plants increase. Therefore, Korea Hydro & Nuclear power Co., Ltd. (KHNP) has established a long-term 10 years plan from 2001 to 2010 for the reduction of radiation dose to workers. The plan is aimed for the reduction of annual dose per unit averaged over 5 years from 0.9 man-Sv in 2001 to 0.75 man-Sv in 2010 by radiation source reduction, equipment/tool improvement or new equipment development for easy maintenance, and the improvement of administration and system.
Chae, Ki-Hwan,Ju, Chang-Il,Lee, Seung-Myung,Kim, Byoung-Wook,Kim, Saeng-Youp,Kim, Hyeun-Sung The Korean Neurosurgical Society 2009 Journal of Korean neurosurgical society Vol.46 No.4
Objective : The purpose of this study was to evaluate the efficacy of a transforaminal suprapedicular approach, semi-rigid flexible curved probe, and 3-dimensional reconstruction computed tomography (3D-CT) with discogram in the endoscopic treatment of non-contained lumbar disc herniations. Methods : The subjects were 153 patients with difficult, non-contained lumbar disc herniations undergoing endoscopic treatment. The types of herniation were as follows : extraforaminal, 17 patients; foraminal, 21 patients; high grade migration, 59 patients; and high canal compromise, 56 patients. To overcome the difficulties in endoscopic treatment, the anatomic structures were analyzed by 3D reconstruction CT and the high grade disc was extracted using a semi-rigid flexible curved probe and a transforaminal suprapedicular approach. Results : The mean follow-up was 18.3 months. The mean visual analogue scale (VAS) of the patients prior to surgery was 9.48, and the mean postoperative VAS was 1.63. According to Macnab's criteria, 145 patients had excellent and good results, and thus satisfactory results were obtained in 94.77% cases. Conclusion : In a posterolateral endoscopic lumbar discectomy, the difficult, non-contained disc is considered to be the most important factor impeding the success of surgery. By applying a semi-rigid flexible curved probe and using a transforaminal suprapedicular approach, good surgical results can be obtained, even in high grade, non-contained disc herniations.
김기일(Kim Ki Il),김병일(Kim Byoung Il),이영생(Lee Yeong Saeng),이순호(Lee Soon Ho) 대한토목학회 2011 대한토목학회논문집 C Vol.31 No.2
최근 콘크리트 블록을 전면판으로 주로 사용하고 있는 기존의 블록식 보강토 옹벽과는 달리 경량의 강재를 지주로 이용하여 전면판의 자중을 감소시켜 안정성을 높이고 시공이 쉬운 보강토 공법이 개발되었다. 이 연구에서는 새로 개발된 보강토 옹벽의 안정성을 확인하기 위해 실제 크기의 현장시험을 수행하여 전면판에 발생하는 수평변위, 수평토압, 그리고 옹벽의 침하량 등을 계측기를 이용하여 측정하였다. 또한, 3차원 수치해석을 수행하여 현장시험결과와 수치해석결과를 비교 분석하였다. 현장계측결과 전면판 최대수평변위는 46㎜(0.009H), 최대침하량은 21.5㎜로 나타나 FHWA 기준을 만족하는 것으로 나타났다. 또한 현장계측결과를 수치해석결과와 비교 · 분석한 결과 새로운 보강토 공법은 충분한 안정성을 확보하는 것으로 나타났다. Recently, a new reinforced retaining wall with light steel support face has been developed. In this study, full size in-situ test is carried out to investigate the stability of the new reinforced retaining wall. The lateral displacement of wall, lateral earth pressure, and settlement of the reinforced retaining wall are measured in the full size test. And numerical analysis by 3-D finite element method is also carried out to compare the test results with those of the analysis. From the full size in-situ test, the maximum lateral displacement of wall is 46㎜(0.009H) and the maximum settlement is 21.5㎜. And comparing these values with those of numerical analysis, it is confirmed that the new reinforced retaining wall with light steel support face is stable and applicable.
Quality Characteristics of Wet Noodles Combined with Sorghum (Sorghum bicolor L. Moench) Powder
Hyun Young Kim,Hye In Seo,Koan Sik Woo,Jee Yeon Ko,Jung In Kim,Jae Saeng Lee,Seuk Bo Song,Tae Wook Jung,Ki Young Kim,Do Yeon Kwak,In Seok Oh,Heon Sang Jeong 한국식품영양과학회 2012 한국식품영양과학회 학술대회발표집 Vol.2012 No.10