Mlc 조절단백질이 대장균의 pts 유전자 발현에 미치는 영향

유상렬 서울대학교 농업개발연구소 1999 농업생명과학연구 Vol.3 No.-

Products of the pts operon of Escherichia coli have multiple physiological roles and the operon is controlled by two promoters, P0 and P1. Expression of the pts P0 promoter that is increased during growth in the presence of glucose is also activated by CRP-cAMP. The effects of the Mlc on the pts P0 expression were studied. In vivo transcription assay using wild type and Mlc strains grown in the presence and absence of glucose indicate that Mlc negatively regulates expression of P0, and Mlc-dependent repression is relieved by glucose in the growth medium. In vitro transcription assay using purified Mlc showed that Mlc repressed transcription from the P0 specifically.

한국에서 분리된 병원성 Salmonella 균주의 장독소 유전자(stn) 분포와 발현조절 기작

유상렬 서울대학교 농업개발연구소 2000 농업생명과학연구 Vol.4 No.-

Role of enterotoxin from Salmonella in pathogenesis is not known. Enterotoxin gene from Salmonella typhimurium (stn) encodes a 29 kDa toxin that has no homology to any other known enterotoxins. Expression of stn is enhanced upon contact with epithelial cell but not all strains having the stn gene express Stn. Based on PCR analysis, we found that all 36 clinical strains of Salmonella isolated in Korea tested carried the stn gene. To understand the regulation of the stn transcription, the expression of stn was studied in vitro. The expression of stn was inhibited by cAMPㆍCRP complex by about 50%.

VHDL을 이용한 MAP의 링크계층의 구현

이상호,신동렬 成均館大學校 科學技術硏究所 1997 論文集 Vol.48 No.2

Computer-integrated automation in manufacturing systems largely depends on local-area networks (LAN's) for information exchange between devices such as computers, PLCs, NCs, and robots. Timely transfer of messages among such devices are critical for real-time operations. Manufacturing Automation Protocols (MAP) is specially designed to provide rapid and reliable which takes place on the factory floor. The token-bus network has emerged as the standard for LANs in industrial environments due to its stability, reliability, and the availability of a priority scheme. For this reason, MAP has specified the token passing bus control for use in the Medium Access Control(MAC) sublayer and Logical Link Control(LLC) sublayer in the data link layer. In this work, we will implement the token bus control algorithms with VHDL, and MAP protocol with relatively low cost. Much will be emphasized on implementing MAP standard protocol based on MAC and LLC.

네트웍 트래픽 관리를 위한 데이터 웨어하우스 시스템 구현

윤상의,유흥렬 한국경영과학회 1998 한국경영과학회 학술대회논문집 Vol.- No.1

A data warehouse is a repository of information integrated from several, heterogeneous, operational databases. Data warehouses are usually dedicated to the processing of data analysis and decision support system (DSS) queries. Although diverse tools are used in network traffic management, network managers should undergo several steps to get necessary information because manual works still take a major part in handling traffic management. This paper presents design and implementation of a data warehouse system for managing network traffic data consistently and providing a useful information to network mangers quickly.

α(t)-modification 을 이용한 수렴특성 개선에 관한 연구

李鍾烈,權誠河 國立 昌原大學校 産業技術硏究所 1987 産技硏論文集 Vol.1 No.-

Direct model reference adaptive control procedures were developed to control linear plants which satisfy a positivity condition. Using a combination of proportional and integral adaptive gains, these procedures achieved asymptotically perfect model output tracking with a large class of time-variable input commands. However, if perfect output tracking is not possible due to output measuring disturbances, the adaptive control system may diverge. Such divergence is to be eliminated, if the pure integration in the adaptive gains is replaced with a first order pole. But such a scheme cannot guarantee the convergence property, if disturbances are not present. In this paper, we use the reduced model to design the adaptive controller, and propose a modified adaptive law to guarantee the convergence property whether the disturbances are present or not.

신경망 이론에 의한 황룡강의 홍수유출예측에 관한 연구

박성천,오창열,김동렬 東新大學校 工業技術硏究所 2004 工業技術硏究 Vol.10 No.-

This research overcomes limitation of physical model using storage function method that is used in flood routing method of flood forecasting-warning system of 5 basic principle basin of our country. We also developed a nonlinear-model of rainfall-runoff process using artificial neural networks (ANNs) that do not consider to hydrology structure of basin. The results show that the ANN_SA_9 selected in the present study generally well-performed the one-step ahead prediction of runoff in the study area, the Sunam station. Also, base on ANN_SA_9 which have the value of R2 more than 0.95 developed in this search, we can have a higher reliability to operate and manage the water resources and rivers plan more efficiently in the future.

혈액투석 환자의 가성 고칼륨혈증

최창렬,조형도,강태영,이준수,한호,정청일,이동규,유준호,한상웅,김호중 대한신장학회 2001 대한신장학회잡지 Vol.20 No.5

기성 콘크리트 파일 두부정리를 위한 자동화 장비의 개발

이정호,김정렬,김영석,조문영,김성근 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

During the last few years, the use of prefabricated concrete pile has been gradually increased in many construction sites. Cutting work of the concrete pile is an important task to crush a part of pile head which is compressed with more than 800㎏/㎠, It is usually performed by a crusher and three to four skilled workers. Recent analysis results of the pile cutting work reveal that it frequently makes a lot of cracks which significantly reduce the strength of the pile and is labor-intensive work. The primary objective of this study is to propose conceptual designs for developing an automated pile cutting machine. It is anticipated that the development of the automated pile cutting machine would be able to bring improvements in safety, productivity, quality as well as cost saving.

雙補丸이 卵巢摘出로 骨多孔症을 誘發한 흰쥐에 미치는 영향

朴鍾元,崔相淳,金哲源,朴炳烈 한국전통의학연구소 2000 한국전통의학지 Vol.10 No.1

Aging is characterized by an age-dependent reduction in bone density. Pronounced bone loss by postmenopausal estrogen deficiency induces a bad effect on dynamic balance of bone metabolism. The purpose of this study is to examine what are the effects of the Ssangbohwan(SBH) on the ovariectomized rat model of postmenopausal osteoporosis. The results were summarized as follows : 1. Body weight in control group showed significant increase in comparison with sham, but that in SBH-treated showed no change in comparison with control. 2. The level of serum albumin in control group showed significant decrease in comparison with sham. That in SBH-treated was slightly decreased in comparison with control, which showed no efficacy. 3. The level of serum ALP activity in control group showed significant increase in comparison with sham, but that in SBH-treated was slightly decreased in comparison with control, which showed no efficacy. 4. The level of serum phosphorous in control group showed significant increase in comparison with sham, but that in SBH-treated showed no change in comparison with control. 5. The level of serum calcium in control group showed no change in comparison with sham, but that in SBH-treated was significantly decreased in comparison with control. 6. The level of serum T3 in control group showed no change in comparison with sham, but that SBH-treated showed significant decrease in comparison with control. 7. The level of serum T4 in control group showed significant increase in comparison with sham, and that in SBH-treated showed significant decrease in comparison with control. 8. Trabecular tibia strength in control group showed significant decrease in comparison with sham, but that in SBH-treated was slightly imcreased in comparison with control, which showed no efficacy. According to the above these results, SBH has shown to be capable of preventing and curing osteoporosis caused by old-aged and postmenopause

중산간 농업용 만운저수지의 수질환경특성

남귀숙,장정렬,이광식,윤경섭,이상준 한국환경농학회 2003 한국환경농학회지 Vol.22 No.1

농촌지역의 도시화와 산업화에 따라 농촌 수질환경의 오염이 심화되고 있다. 경북 안동의 중산간지대에 위치한 만운저수지는 유역면적 23.8 km², 수표면적 0.4 km², 저수량 2.0×10^(6)m³의 부영양화 된 중규모 농업용저수지로서 1999년 수질환경특성조사를 실시하여 오염된 유사 농업용 저수지의 수질특성이해에 중요한 자료로 활용하고자 하였다. 만운저수지의 수질에 영향을 미치는 유역면적값(DA)/호수면적값(SA)의 비가 56.1로 국내 다른 농업용 저수지보다 높게 나타나 유역의 오염물질 부하가 높은 편이며, 평균 수심과 관련된 유효저수량(ST, m³)/수표면적(SA, m²) 비는 4.79로서 안동호, 팔당호보다 낮고 삽교담수호 등과 비슷한 값을 보여주어 부영양화의 잠재성이 높은 것으로 나타났다. 만운저수지의 수질조사결과 COD는 11.1 mg/L, 총질소 1.426 mg/L로 환경기준중 생활환경 Ⅳ등급인 농업용수 수질기준을 초과하였으며, 총인은 0.093 mg/L로 Ⅳ등급의 수질을 나타내고 있었다. 유입하천은 총질소(1.426~3.809 mg/L)가 비교적 높게 나타나고 있어 총질소에 기준한 수질개선 방안이 요구되었다. 식물성플랑크톤 조사결과 Oscillatoria와 근연종인 Lyngbya가 우점하였으며, 둥물성플랑크톤은 대부분의 지역에서 적조현상을 일으키는 와편모충인 Gynmodinium spp., 암색편모충인 Cryptomonas spp.이 우점하였다. 부영양화도지수(TSI)를 이용한 1999년도의 시기별 영양상태 변화는 9월에 과부영양상태를 보었으며, 연도별 TSI_(M)지수는 '96년, ‘97년에 부영양, '98년의 과영양으로 영양상태가 증가하였으나, 강우가 다소 많았던 '99년에는 강우의 영향으로 다소 개선되어 나타났다. 결론적으로, 저수지의 물리구조적 유역특성 및 수리학적 특성상 만운저수지는 부영양화에 취약한 특성을 가지고 있으며, 강우량에 영향을 받고는 있으나 전반적으로 부영양화도가 증가하는 추세를 보인다. 따라서, 이와 같은 추세변화를 정확히 인식하고 그에 적절한 대책을 마련하기 위해 농업용수 수질측정망 운영이 상당히 중요하게 인식되어지며, 수질환경 특성을 감안한 합리적 운영이 이루어져야 할 것으로 사료된다. Manun Reservoir, located in Andong district, has the capacity of 2 million tons in irrigation water supply with the drainage area of 23.8 km². Manua Reservoir is over fifty year old, and shallow in depth. The ratio of drainage area (DA) to reservoir surface area (SA) as an effective physical parameter on water quality was 56.1 and was higher than those of other agricultural reservoirs. The ratio of reservoir storage (ST) to SA in Manun Reservoir was 4.79, and the mean depth was below 8 m. Both ratios of DS/SA, total area (TA)/ST and ST/SA in Manua Reservoir were relatively higher than those in other agricultural reservoir and natural lakes in Korea. These physical parameters in Manun Reservoir, however, had a eutropic potential significance. Average of COD, TN, and TP in Manun Reservoir were 11.1 mg/L, 1.426 mg/L, 0.093 mg/L, respectively. In the inflow stream of Manun Reservoir, the TN (1.426~3.809 mg/L) was higher than those in reservoir. Only Lyngbya spp. was dominant in phytoplankton for this study period, and Gymnodinium spp., Peridinium spp., and Cryptomonas spp. were dominant in zooplankton. According to the Carlson's trophic status index, Manua Reservoir was eutrophic in 1996, 1997, and 1999, and hypertrophic in 1998.