혐기 및 2단 교호(交互) 간헐포기조를 이용한 하수고도처리에 관한 연구 : 파일럿 규모의 실험결과를 중심으로 A Pilot-scale Study

최용수,홍석원,권기한 한국물환경학회 2004 한국물환경학회지 Vol.20 No.3

The performance of a newly designed wastewater treatment process equipped with an anaerobic and two intermittent aeration tanks operated alternately was investigated. During the experimental period, several types of cyclic operating schedules with different aeration and non aeration time were examined for the optimization. At all modes, the removals of organic matter and SS were highly achieved. With respect to T-N removal, however, the cycle length for aeration on/off affected the efficiencies. At the optimal operating mode, the ORP bending point indicating the disappearance of nitrate was observed. Considering the influent wastewater characteristics and cyclic operating schedules, it can be suggested that T-P removal is much more BOD/T-P ratio and/or its load dependant rather than the aeration on/off time. The results obtained from pilot-scale test showed the competitive advantage of this alternating process through an omission of nitrate recycle and operational flexibility against influent load variations when comparing with other continuous flow processes.

보육실습에 대한 보육시설장 및 보육교사와 예비보육교사의 인식 및 요구

최석란;신지연;서원경 서울여자대학교 2004 아동연구 Vol.10 No.-

[초록없음]

고속 HMC 이송계의 운동특성 평가 및 운동오차 예측

최헌종,허남환,강은구,이석우,홍원표 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-

Recently, the evolution in production techniques (e.g. high-speed milling) and the complex shapes involved in modern production design has been increasingly popular. The key to the achievement is a drastic improvement of the dynamic behavior of the machine tool axes used in production machinery. The more complex these tool paths the higher the speed and acceleration requirements. But it is very difficult to reach the target for high speed machine tool because of the limitations of servo system and motion control system. However the direct drive design of machine tool axes, which is based on linear motors and which recently appeared on the market, is a viable candidate to meet the ever increasing demands, because of these advantages such as no backlash, less friction, more mechanical simplicity and very higher acceleration and velocity comparing to the traditional system. This paper focused on the performance tests of the high speed horizontal machine tool based on linear motor. Especially, dynamic characteristics were investigated through circular test and circular form machining test is carried out considering many important parameter. Therefore these several experiments is used to be evaluated the model for prediction of circular motion error and circular machined error.

사후분해 시체에 대한 법의학적 접근

최영식,이상용,김유훈,조갑래,이봉우,양경무,정낙은,서중석,이한영,이원태,강현욱 大韓法醫學會 2000 대한법의학회지 Vol.24 No.2

Disposal of a homicide victim by dismemberment is rare, but individual cases are on record in most major medicolegal departments. Recognition of postmortem mutilation may be of importance in the interpretation of certain murders committed by sexual perverts and other mentally deranged individuals and sometimes performed for the sole reason of easier disposal of the body. Postmortem dismemberment is usually readily recognizable as such; The edges of the injuries are dry and lack evidence of bleeding. The joints may be disarticulated without fracture, or the use of an axe or saw may be evident from examination of bones. Parallel horizontal or oblique furrows in the bone surface are caused by skipping of the saw prior to establishing depth. Such patterns on the bone may assist in identifying the particular saw involved. So we report 25 dismembered corpses that autopsied in National Institute of Scientific Investigation. This paper can help in attempting to establish not only the first criminal investigation steps but also the medicolegal approach methods in unidentified and dismembered deaths.

미생물 컨소시엄에 의한 페놀수지 Resole의 분해

최원식,차민석,오계헌 순천향대학교 기초과학연구소 1997 순천향자연과학연구 논문집 Vol.3 No.1

Microbial consortia were screened for their ability to degrade resole at the sole carbon source. Five microbial consortia were derived from a plant site where a biological treatment of liqid waste stream of a manufacturing facility was located. Among the consortia, the test consortium, designated as MS2, displayed approximately 70% degradation of the substrate, 0.1 g of resole per liter, within the first twelve days of incubation but the degradation did not proceed to completion. pH was decreased and resole degradation was inhibited under the conditions. UV-spectroscopy was used quantitatively to monitor the residual concentrations of resole in the present work. UV-scans of spent culture showed that wavelength of maximum absorption was 216nm for resole.

수술로 유도된 관절원판의 전방변위시 하악과두 관절연골의 Proteoglycan과 결합단백의 변화에 대한 연구

최원석 대한 두개하악 장애학회 1997 대한두개하악장애학회지 Vol.9 No.1

The purpose of this study was to test the hypothesis that surgical induction of anterior disc displacement(ADD) in the rabbit craniomandibular joints(CMJ) will lead to degenerative osteoarthritic changes in the articular cartilage of the rabbit mandibular condyle by analyzing alterations of proteoglycan molecules and link protein. The quantities of cartilage proteoglycans such as chondrooitin-4-sulfate(C4S), chondroitin-6-sulfate(C6S), keratan sulfate(KS) and link protein(LP) were measured using immunogold labeling technique at the electron microscopic level. The right joint of each of five rabbits was exposed surgically, and all discal attachments were severed except for the posterior attachment. The disc was then displaced anteriorly and sutured to the zygomatic arch. The left joint served as a sham-operated control. Ten additional joints were used as non-operated controls. Deeply anesthetized rabbits were perfused with 2% buffered formalin two weeks after surgery. The mandibular condyles were excised and decalcified in ethylenediaminetetraacetic acid(EDTA). Water-soluble plastic embedded sections were incubated in monoclonal antibuodies directed against C4S, C6S, KS and LP. After incubation in the appropriated colloidal gold conjugated secondary antibodies, tissue sections were studied with electron microscope. The results of the immunocytochemistry using colloidal gold conjugates at the electron microscopic level showed statistically significant declines in C4S, C6S, KS, LP (p<0.05) in the osteoarthritic cartilage. It is concluded that surgical induction of ADD in the rabbit CMJ leads to alterations of the proteoglycan molecules in the articular cartilage of the mandibular condyle similar to those described previously in human ADD and in osteoarthritis of other synovial joints. The results of this study provide evidence that the loss of the shock absorber function of the disc, and the exposure of the condyles to overloading may cause the injured chondrocytes to secrete degenerative cytokines as indicated by the loss of proteoglycans and LP. These molecular changes are expressed at the subcellular and cellular levels as osteoarthritis or degenerative joint disease.

양측성 관상동정맥루 1예

최용원,오석규,이재훈,이상재,권경희,최은경,김남호,정진원 圓光大學校 醫科學硏究所 2002 圓光醫科學 Vol.17 No.1

저자들은 호흡곤란, 흉부불쾌감, 심계항진 등을 주소로 내원한 환자에서 경흉부 및 경식도 심초음파 검사상 주폐동맥에서 이완기에 전행하는 지속적인 혈류의 흐름을 관찰하고, 관상동맥 조영술을 통해 좌전하행지 중간부위와 우관상동맥 근위부에서 각각 기시하여 공통경로를 이루면서 주폐동맥으로 유입되는 양측성 관상동정맥루를 보이는 드문 1예를 경험하였기에 문헌 고찰과 함께 보고하는 바이다. A coronary arteriovenous fistula is infrequently encountered vascular communication between a coronary artery and a cardiac chamber, a great artery or the vena cava. It is the most common congenital anomaly that can affect coronary perfusion. Bilateral involvement of coronary fistula constitutes an uncommon subgroup of coronary arteriovenous fistulas. A 69 year-old female patient presented with chest discomfort, palpitation, and dyspnea. In the echocardiography, doppler color flow imaging visualized abnormal flow signals with mosaic appearance in the main pulmonary artery during diastolic phase. Coronary angiography revealed arteriovenous fistula arising from the left anterior descending artery and the right coronary artery. Both coronary arteriovenous fistulas drained into the main pulmonary artery. We report a case of bilateral coronary arteriovenous fistula that was confirmed by echocariography and coronary angiography.

증편 반죽의 냉동 가능성에 관한 연구

최원석,노정옥,우경자 동아시아식생활학회 2003 동아시아식생활학회지 Vol.13 No.6

This study was carried out in order to investigate the possibility of frozen rice batter for the manufacturing of Jeung-pyun. Despite of its unique taste and texture, Jeung-pyun is not consumed much because it needs long time to make. The physicochemical, sensory, rheological and surface characteristics of Jeung-pyun were analyzed to develop the easy manufacture method. The storage condition of rice batter was used at -20℃ up to 4 weeks. Statistical data analysis was completed using a SAS program. The results are summarized as follow: The pH, brix% and sugar content of all samples which added low-temperature tolerance raw yeast or regular raw yeast decreased during the fermentation. Kind of yeast did not influence on the moisture content of the Jeung-pyun batter. Specific volume and carbon dioxide evolution of Jeung-pyun batter were highest when the rice batter was frozen for 1 week regardless of the kind of yeast. Overall quality of frozen batter of Jeung-pyun at -20℃ for 4 weeks had the highest score among different samples. As the test results of mechanical characteristics, cohesiveness, gumminess, brittleness, hardness and springiness did not show any significant differences statistically. The result clearly suggests that freezing the rice batter is a possibile way to manufacture Jeung-pyun.

실기간 운영 체제의 성능 평가를 위한 벤치마크 프로그램의 개발

최석원,강희국,박윤용 선문대학교·중소기업기술지원연구소 1998 선문공대 연구/기술 논문집 Vol.3 No.1

都市公園의 發達 : 大邱市를 中心으로

崔奭周,金元經 新羅大學校 1996 論文集 Vol.42 No.1

Today, in the industrial society, the urban park is the place for citizens' health, recreation, exercise, and education. It is a very important place as a fine sight and the maintenance of public security. As the results of rapid economic growth during the last thirty years, citizens are in the age of material civilization and are challenged with many serious urban problems such as pollution, noise, traffic congestion, human alienation, etc. Rapid material civilization resulted in citizens' mental and physical diseases. To some of the problems, it is necessary that we should have proper leisure and recreation facilities, and that we should have the active, positive posture to them. Especially, we need the outdoor recreational spaces and facilities. But nowadays the urban park is given little attention in spite of the necessity of the park which should be used as a recreational space in the urban areas. Thus, this study attempts to comprehend the function, quantity and quality of the urban park system in Taegu City. It is clear that the quantity is insufficient. Because of inappropriate disposition and management, its coefficiency of utilization is low.