• 한국습지학회지
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• 제14권3호
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• pp.365-374
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• 2012

양돈 농가에서 구리, 아연 등의 성장촉진제와 항생제들이 사료 첨가제로 사용되는데 사료에 주입된 많은양이 분뇨로 배설되고 있다. 국내 양돈 폐수의 90% 이상이 퇴, 액비 형태로 농지에 적용되고 있는 상황에서 퇴,액비 내에 함유된 중금속과 항생물질은 토양에 흡착되어 농지에 잔류하거나 지하수나 지표수로 유출되어 수계로 빠져나간다. 농지에 살포된 중금속과 항생물질의 토양 내에서의 거동을 살펴보기 위해 실험실 기초 실험을 수행하였는데, Jar test와 칼럼 용출 실험을 수행하였다. 실험결과 아연의 86.4와 구리의 68%가 토양에 흡착되는 것으로 나타난 반면, 액비에 포함된 항생물질의 60% 이상은 칼럼 유출수로 용출되는 것으로 나타났다.

• 박물관보존과학
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• 제5권
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• pp.5-15
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• 2004

국립중앙박물관 보존과학실은 미술관리부에서 용산 새 박물관에 개관 전시할 소장품 중 도자기실에 새로이 전시할 도자기 보존처리 목록을 보내온 바 있다. 이에 의거하여 보존과학실에서는 그 목록을 토대로 2002년부터 연차적으로 보존처리를 해오고 있는 상태이다. 이번 글은 그중 청화백자운봉문대호(접수631)와 청자공작수주(덕수5202)를 복원하는 과정을 소개하고자 한다.

• Journal of Microbiology and Biotechnology
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• 제16권12호
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• pp.1849-1855
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• 2006

It has been shown that the initial conditions of bacterial cultivation are extremely important for the successful production of hyaluronic acid (HA) by fermentation. We investigated several parameters that affect cell growth rate and the productivity and molecular weight of hyaluronic acid--i.e., agitation speed, aeration rate, culture temperature, pH, and pressure--to determine how to optimize the production of HA by Streptococcus zooepidemicus on an industrial scale. Using a 30-1 jar fermentor under laboratory conditions, we achieved maximum HA productivity and biomass when the agitation speed and aeration rate were increased simultaneously. By shifting the temperature downward from 35$^{\circ}C$ to 32$^{\circ}C$ at key levels of cell growth during the fermentation process, we were able to obtain HA with a molecular weight of $2.8{\times}10^6$ at a productivity of 5.3 g/l. Moreover, we reproduced these optimized conditions successfully in three 30-1 jar fermentors. By reproducing these conditions in a 3-$m^3$ fermentor, we were able to produce HA with a molecular weight of $2.9{\times}10^6$ at a productivity of 5.4 g/l under large-scale conditions.

• 한국식생활문화학회지
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• 제6권4호
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• pp.433-443
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• 1991

To analyse reception dishes of Choson Dynasty the author studied historic book-Youngjeob Dogam Bansunsek Euigwae (1609, 1626, 1634 year) in which the daily reception dishes for Chinese envoy in Choson Dynasty were described. The results obtained from this study were as follows. 1. The daily food items for reception of Chinese envoy were refined rice wine, rice, large fish, fish, Zogi, Driedjogi, mullet, pork, beef, chicken, egg, salt, soysauce, sweet soy sauce, refined soy sauce, sesame oil, vinegar, bean curd, stone leek, parsley, ginger and gaslic etc. 2. The daily tablewares used for reception of Chinese envoy were ricebowl (bari), small bowl of porcelain (boa), water bowl (daejeop), soup bowl (tang gi), plate (jeopsi), small dish (jong gi), small earthen ware jar (dong hae), jar (hang), pottery (ong gi), wine glass (jan), water cup, chopsticks, kettle, cauldron, bottle, table, knife, napkin, dish towel, brazier, washbowl and meter etc.

• Journal of Microbiology and Biotechnology
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• 제5권5호
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• pp.285-291
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• 1995

Saccharide utilizations for the growth by Bifidobacterium longum and Bifidobacterium breve were compared. B. longum fermented glucose more rapidly than lactose as a carbon source whereas B. breve fermented lactose at a rate higher than that of glucose. The highest cell concentration, in the case of B. longum, was obtained when cultivated in a jar fermentor that contained modified MRS medium that half the beef extract was replaced by the same amount of tuna extract, and that pH was controlled at 6.0. B. breve showed the best growth when grown in a jar fermentor containing the MRS medium with lactose instead of glucose, controlled at pH 6.0. The optimal concentration of peptone in MRS medium for the growth of B. breve was 5 g/l.

• 한국미생물·생명공학회지
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• 제30권2호
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• pp.167-171
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• 2002

Candida sp. SY16의 휴식세포를 이용하여 탄소원만 포함되 있는 증류수로부터 많은 양의 생물계면활성제(mannosylerythritol lipid: MEL)를 생산할 수 있었다. 플라스크를 이용한 생산반응의 경우, 20 g/l의 휴식세포를 75g/1의 soybean oil이 포함되있고, pH는 4~5범위에서 반응할 때, 가장 높은 생산수율을 얻을 수 있었으며, 높은 농도($PO_4$-P 농도 198 $\mu\textrm{g}$/ml 이상)의 인은 MEL 생산을 저해하는 것으로 나타났다. 최적화된 조건으로 jar fermentor를 이용하여 휴식세포를 반응한 경우 생물계면활성제를 120 h 반응 후, 58 g/l로 얻을 수 있었으며, 그 생산성은 성장세포를 이용한 회분식 발효의 경우보다 높았고, 배양시간도 단축시킬 수 있었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 B
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• pp.1009-1011
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• 2001

This paper presents a new hybrid control scheme using Active-Clamped Class-E (ACCE) inverter of induction heating(IH) jar for high power applications. The proposed hybrid control scheme has characteristics, which act as class-E inverter at lower switch voltage and ACCE inverter at higher switch voltage than reference voltage of the main switch by feeding back voltage one as well as advantages of conventional ACCE inverter such as zero-voltage switching(ZVS) of the main switch and the reduced switch voltage due to the clamping circuit. Moreover, the proposed control method makes higher output power than conventional ACCE inverter control one since ACCE inverter is operated like class-E inverter at low voltage condition. The principle of the proposed control are explained in detail and the validity of the proposed control scheme is verified through the several interesting simulated and experimental results.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.282-285
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• 1996

In the water purification plant, the raw water is promptly purified by injecting chemicals. The amount of chemicals is directly related to water quality such as turbidity, temperature, pH and alkalinity. At present, however, the process of chemical reaction to the turbidity has not been clarified as yet. Since the process of coagulant dosage has no feedback signal, the amount of chemical can not be calculated from water quality data which were sensed from the plant. Accordingly, it has to be judged and determined by Jar-Test data which were made by skilled operators. In this paper, it is concerned to model and control the coagulant dosing process using jar-test results in order to predict optimum dosage of coagulant, PAC(Polymerized Aluminium Chloride). The considering relations to the reaction of coagulation and flocculation, the five independent variables(turbidity, temperature, pH, Alkalinity of the raw water, PAC feed rate) are selected out and they are put into calculation to develope a neural network model and a fuzzy model for coagulant dosing process in water purification system. These model are utilized to predict optimum coagulant dosage which can minimize the water turbidity in flocculator. The efficacy of the proposed control schemes was examined by the field test.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2010년도 하계학술대회 논문집
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• pp.274-274
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• 2010

안료의 색상은 출발원료의 조성, 입자크기 및 소결온도에 의한 결정구조 등에 의존한다. 본 연구에서는 Rutile구조를 갖는 세라믹안료인 $TiO_2-WO_3$-NiO의 합성에서 소결온도를 결정하기 위해 소결전 출발원료를 습식법에 의하여 Jar Mill에서 0.7-0.9um로 혼합분쇄한 후 $100^{\circ}C$에서 24시간 건조하였다. 건조후 $1100-1280^{\circ}C$에서 5구간을 선정하여 소결한 시료를 Jar Mill에서 0.8-1um로 분쇄한 후, 다시 $100^{\circ}C$에서 24시간 건조하였다. 이렇게 얻어진 시료를 XRD로 상합성 정도를 조사하고, 색상 및 착색력을 spectrophotometer를 분석하였다. 색상은 1150와 $1250^{\circ}C$에서 가장 좋은 Yellow 색상이 관찰되었으며, XRD에 의한 결정성의 분석결과와 비교적 일치하고 있다. Rutile구조를 갖는 세라믹안료의 색상은 소결시의 결정화도에 따라 민감하게 변화되고 있음을 알 수 있다.

• 제어로봇시스템학회논문지
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• 제10권6호
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• pp.551-556
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• 2004

Coagulation process is one of the most important processes in water treatment procedures for stable and economical operation, and coagulant dosing of this process for most plants is generally determined by the jar test. However, this method does not only take a long time to analyze and get the result but also has difficulties in applying to automatic control. This paper shows the feasibility of applying neural network to control the coagulant dosing automatically in water treatment plant. To be specific, the predicted results of the neural network model is shown to be similar to that of jar test. The input variables for learning the neural network are turbidity, water temperature, pH, and alkalinity. Combining the neural network and SCD(Streaming Current Detector) for feedforward and feedback control of injecting coagulant, a rapid change of the raw water quality can be accommodated.