大型建築物의 中水道設置에 對한 妥當性 硏究

安承丘,柳明辰,朴鍾雄 서울市立大學校 1985 論文集 Vol.19 No.-

The purpose of this study is to clarify present status, effects, problems and overall aspects of the recycled water supply system, and to analize economics of watewater reuse. Based on the results, the following conclusions may be drawn; 1. The cost of the recycled water supply system is about two times as much as the conventional wastewater treatment cost, and it is about two to five times as much as the residertial water supply and drainage charge. 2. In a large-sized building with water consumption above 500㎥/d, the water supply and drainage charge is higher than the recycled water supply cost. Therefore, it may be recommended to introduce the recycled water supply system. 3. In order to promote wastewater reuse, the cost for the recycled water supply should be lower than the water supply and drainage charge. It may be accomplished by lowering the public utility fee basis for the treatment and developing new water treatment technologies. 4. The cost of ground water use is lower than the recycled water cost. But continuous pumping of ground water may cause sinking problems. Therefore, the wastewater recycling may be favorable to alleviate the water supply shortage in the down-town area.

말기신부전 환자에서 혈액투석 전후의 QT간격분산 비교

강대웅,정지용,윤나라,안치용,김종오,신병철,정종훈,김현리 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.2

Background: Some cases of QT interval, corrected QT interval (QTc), QT dispersion (QTd) and corrected QT dispersion (QTcd) have been reported in ESRD, but these results are variable and the influence of a hemodialysis is still controversial, In this study, we investigated the effect of hemodialysis on QT and QTc interval and QT and QTc dispersion in patients with ESRD 15 min before and 15 minute after each hemodialysis. Methods: Sixty-seven patients with ESRD (men 33 & women 34) on three-times stable hemodialysis (>3 months) were randomly enrolled. Fifty control subjects with a similar age and normal renal function were enrolled from this hospital. Routine biochemical studies were measured pre- and post dialysis, at the time of the ECG. Plasma Na+, K+, BUN, creatinine, ionized calcium and phosphate were checked. Twelve-lead electrocardiographs were performed at 10㎜/mv and 50㎜/s using a HewIett-Packard Pagewriter 100, before and after a single hemodialysis session.The QT interval was measured from the onset of the QRS complex to the end of the T wave. If the end of the T wave was not clear in a particular lead then it was excluded from analysis. When U waves were present, the end of the T wave was taken as the nadir between the T and U waves. Each QT interval was corrected for heart rate using Bazett's formula (QTc==QT/√(RR)) (ms). The difference between maximal and minimal QT interval duration was defined as QT dispersion (QTd) in each of the 12 leads. Result: This study demonstrates that QT, QTd, QTcd is higher in hemodialysis patients compared with control subjects, and QT and QTd rise postdialysis to levels comparable to those seen acutely following myocardial infarction, when patients are at greatly increased risk of potentially fatal ventricular arrhythmias, Conclusions: QT interval and QT dispersion, markers of risk for arrhythmias and sudden death, are elevated in hemodialysis patients, and rise postdialysis. QT interval and QT dispersion is an easily obtainable, noninvasive, simple, inexpensive, and widely available method of risk stratification in uremic patients receiving chronic dialysis. Additional studies are needed to clarity whether increased postdialysis QT dispersion results in an increased occurrence of arrhythmias.

EU의 Biomass를 이용한 에너지 생산

이종식,고문환,박우균,안종웅 한국국제농업개발학회 2003 韓國國際農業開發學會誌 Vol.15 No.3

EU 국가들의 1993년부터 1999년까지의 6년간 재생에너지 사용량 변화를 살펴보기 위하여 절대량 증가와 증가율을 조사하였다. 많은 나라들이 높은 사용량 증가 또는 증가율을 나타내었다. 초기에 재생에너지 사용이 적었던 나라들은 1999년에도 실질적인 생산량은 적지만 기간 중 높은 증가율을 보였다. 반면에 1993년에 이미 사용량이 높았던 나라들은 낮은 증가율을 보였으나 전체사용량은 높은 수준이었다. 재생 에너지 사용의 성공 여부는 보급 확대를 위해 많은 장해물들을 극복한 후에 성취될 수 있다. 보급 확대를 위한 요인들로는 정치적, 제도적, 재정적, 행정적인 지원과 기술개발, 홍보, 교육 및 훈련 등이 있다. Biomass를 이용한 에너지 생산 및 보급에 성공한 덴마크, 핀란드, 독일, 스페인 및 스웨덴의 송공 요인들을 소개하였다. In order to identify those Member State/technology combinations where there has been most success in achieving renewable energy penetration over the six-year period 1993-1999, the two selection criteria such as absolute increase and percentage of increase have been applied. Many Member States show either a large absolute increase in renewable energy output, or a large percentage of increase. Member States with only very low initial levels of renewable energy use may demonstrate rapid growth rates even though the actual quantity of output is still only small. Conversely, Member State with levels of renewable energy use that were already relatively high in 1993 show a less rapid percentage growth rate, but these Member States may still Have added significant quantities to the overall output. Successful penetration of renewable energy can only be achieved after overcoming many varied obstacles to an increase in their exploitation. Factors, which can influence the successful implementation of renewable energy projects, include political, legislative, financial administration, technological development, information, education and training. Examples of successful penetration of biomass power were shown for Denmark, Finland, Germany, Spain and Sweden.

Ni-Diamond 복합도금의 표면형상 및 마모시험

최재웅,안종관,안재우 대진대학교 첨단소재연구소 2000 첨단소재연구소논문집 Vol.3 No.-

Diamond particles in the Ni sulfamate electrolyte solution were deposited with nickel onto steel wire and codeposition mechanism of diamond and nickel was studied also under rotating disc electrode geometry. Composite coating is the method that codeposit inert particles in the electrolyte with metal matrix to improve material properties such as wear resistance, corrosion resistance and hardness. Effect of potential, initial diamond concentration and rotating speed on Ni-diamond composite coatings were studied. Increasing of initial diamond concentration and rotating speed enhance the codeposition ratio of diamond and mass transfer of nickel ions. As diamond in the deposits increase, hardness of deposits increase, and friction coefficient is lowered. Zeta potential of deposits increase, and friction coefficient is lowered.

유압굴삭기의 부하감지회로에 대한 연구

趙勝鎬,安世雄,朴鐘沅 弘益大學校 科學技術硏究所 1996 科學技術硏究論文集 Vol.7 No.1

In this paper theoretical analyses are performed on the load sensing system of excavator and databases are constructed for the valve opening areas, pump horce power control and for load sensing regulator. For hydraulic components modularized modelings are carried out, which is expected to be utilized for software development of fluid power system. Through simulation an information of any point in fluid power circuit can be obtained.

재래종 콩 유전자원의 주요 형태적 특성과 변이

윤문섭,백형진,이정란,김행훈,조양희,안종웅,김창영 한국국제농업개발학회 2003 韓國國際農業開發學會誌 Vol.15 No.4

본 실험은 한국, 중국 및 일본 재래종 콩 유전자 자원의 주요형질 변이를 조사하고 이들 자원간의 지리적 유연관계를 비교하고자 수행하였으며, 그 결과를 요약하면 다음과 같다. 1. 경장은 한국(66㎝)이나 일본자원(54.9㎝)보다 중국자원(71㎝)에서 더 컸으며, 또한 변이도 중국자원에서 가장 큰 것으로 나타났다. 2. 개화일수 및 생육일수는 한국자원(65.5일, 151.4일)이 가장 길었으며 중국(57일, 120일)과 일본자원(59.9일, 122.4일)은 같은 경향을 나타냈다. 또한 한국과 중국자원은 지역에 따른 차이를 나타냈으나 일본자원에서는 확인할 수 없었다. 3. 백립중은 한국(18.8g), 일본(17.2g) 및 중국(14.7g) 순으로 무거웠다. 특히 한국자원은 9~11g과 23~25g에서 정점을 나타냈고, 변이폭도 가장 컸다. 반면 일본과 중국자원은 13~17g사이에서 정점을 나타냈다. 4. 협수는 중국(46.9개)이나 일본자원(36.5개)보다 한국자원(75.5개)에서 가장 많았으며, 변이폭도 한국자원에서 가장 컸다. 내도복성은 일본자원에서 가장 강하였다. 5. 정준판별분석결과 can 1을 경계로 하여 오른쪽 상하에 한국재래종이 주로 분포하였고 왼쪽에는 중국과 일본 재래종이 주로 분포하여 각 나라별로 고유한 영역을 가지고 분리되었다. 전체적 경향이 중국과 일본자원이 한국자원보다 가까운 경향을 나타냈다. This experiment was carried out to compare the characters of 944 Korean soybean landraces, 716 Chinese, and 170 Japanese soybean landraces introduced from USDA soybean germplasm collection. Cannonical discriminant and cluster analyses were conducted by their origins. The population from China was taller in plant height than those from Korea and Japan, also its variation was largest in Chinese population. The population from Korea was langer than those from China and Japan in terms of days to flowering and maturity. Also, Korean and Chinese accessions appeared the difference of those traits according to latitude. One hundred seeds weight was in the order of Korean(18.8g), Japanese(17.2g) and Chinese populations(14.7g), especially Korean population was distinguished into two groups; the group including accessions between 10 and 15g, and the other group including accessions between 20 and 25g. However, others showed the peak in range of 13~17g. The number of pod per plant was more in Korean accession(75.5) with the largest variation than Chinese(46.9) and Japanese accession(36.5). The distribution of Korean, Chinese and Japanese accessions reflected the origin of accessions analyzed by cannonical discriminant analysis. The relationship between their geographical origins showed the population of China and Japan are losely related.

지모(知母)의 항암활성성분에 관한 연구

이승호,유시용,최상운,노재성,김성기,이정옥,안종웅 영남대학교 약품개발연구소 1995 영남대학교 약품개발연구소 연구업적집 Vol.5 No.-

EtOAc soluble part of MeOH extract of Anemarrbena asphodeloides rhizome was evaluated for the cytotoxicity against the five kinds of human tumor cell lines (A-549, SK-OV-3, SK-MEL-2, XF498 and HCT15) in vitro. Bioassay-guided fractionation of EtOAc soluble part led to the isolation of active compound which was identified as timosaponin A-Ⅲ1 showed potent cytotoxic activity, but its genin, sarsasapogenin, did not show cell growth inhibition.

Bithiazole Metabolites from the Myxobacterium <i>Myxococcus fulvus</i>

Ahn, Jong-Woong,Jang, Kyoung Hwa,Yang, Hyeong-Cheol,Oh, Ki-Bong,Lee, Hyi-Seung,Shin, Jongheon The Pharmaceutical Society of Japan 2007 Chemical & pharmaceutical bulletin Vol.55 No.3

<P>Two new bithiazole metabolites (3, 4) along with the previously reported compounds (1, 2) were isolated from the culture broth of the gliding bacterium <I>Myxococcus fulvus</I> collected from a Korean soil. The structures of these compounds were determined to be analogous to myxothiazole A on the basis of combined spectroscopic analyses. The new compounds exhibited significant cytotoxicity and moderate antifungal activity against the mouse fibloblast cell-line L929 and <I>Candida albicans</I>, respectively. These data were consistent with the previous finding that the bioactivity of myxothiazoles was highly dependent on the presence of terminal methoxy enol functionality.</P>

Spirodienal C, a New Spiroketal Produced by Sorangium cellulosum (Myxobacteria)

Ahn, Jong-Woong Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.5

Myxochelin A, a cytotoxic antibiotic from the myxobacterium Angiococcus disciformis

Ahn Jong-Woong,Lee Chong-Ock,Baek Seung-Hwa Kyung Hee Oriental Medicine Research Center 2002 Oriental pharmacy and experimental medicine Vol.2 No.1

In the course of screening for new anticancer antibiotics from myxobacteria, strain JW357 was found to produce an antibiotic that was active against several human cancer cell lines. This strain was identified as Angiacaccus disciformis by morphological and cultural characteristics. The antibiotic produced was identified as myxochelin A. It demonstrated significant cytotoxicity against certain human cancer cells with $IC_{50}$ values ranging 1.15 to $2.36{\mu}g/ml$. Myxochelin A was interestingly as active against multidrug-resistant CL02 cells as against the sensitive parental cells (HCT15).