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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.
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.
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.
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%.
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.
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.
타타늄의 열처리 조건에 따른 동전위 양극분극특성 및 표면 미세구조 변화
주동현,이용렬,정영화,양홍서,박상원,이도재,송호준,박영준 大韓齒科器材學會 2002 대한치과재료학회지 Vol.29 No.2
The corrosion resistance of metallic implants is essential for successful implant osseointegration. Moreover, the implant surface should have appropriate surface roughness for the attachment of the osteoblast and collagen fibrils. When titanium is exposed to air a thermodynamically very stable oxide film is formed at once. This oxide is very thin and yet it protects the metal from corrosion instantaneously. However, the oxide would not be ideal, and it would be supposed that the state of oxide film would be various by the different conditions when it is formed. The objective of this study was to evaluate the electrochemical properties and surface microstructural changes of titanium after passivation treatment or exposure to high heat (in vacuum or in air). ASTM grade 2 commercially pure titanium (Ti) disks of 10㎜ diameter were wet ground and polished with 240 and 600 grit SiC, and then ultrasonically cleaned with distilled water and ethanol. Cleansed as-received samples (As-R group) were passivated with 30% nitric acid solution at 50℃ for 15 minutes to make the Pas group. The Std-V samples were made by treating the Ti disks in vacuum quartz tube (10^-8 Torr) at 530℃ for 40 min for stress relieving, followed by annealing at 700℃ for 90 min, and then slow cooling to room temperature. The Std-A samples undergo identical procedure as the Std-V group except that it is done in air. For 530℃-V samples, Ti disks were heated at 530℃ for 40 minutes and slow cooled to room temperature. The 1000℃-V samples were produced by heating Std-V specimens again at 1000℃ for 2 hr, followed by cooling to room temperature. 530℃-A and 1000℃-A samples were also prepared. Potentiodynamic anodic polarization measurement, SEM, AFM and XRD analysis were performed to evaluate the effects of the various treatments. The difference in the mean values of E_corr between groups showed statistically significant difference (P<0.05), but that of I_corr did not show significance (P>0.05). When Ti surface was passivated there was a shift of corrosion potential (E_corr) in the noble direction and a lower corrosion current density (I_corr) value. Std-A samples showed most noble E_corr value among the tested groups. 530℃-V samples showed more noble E-corr than other tested groups except Std-A group. 1000℃-V samples showed more noble E-corr than those of Std-V sample. In the case of Std-, 530℃- and 1000℃-groups, -A sub-groups showed better corrosion resistant characteristics than -V sub-groups in regard to E-corr and I_corr values. In the SEM observations, the surfaces of the As-R samples showed only scratch line on smooth surface. In Pas samples, thick oxide layer covered the surface under high magnification observation. 530℃-A samples were covered by oxide granules, and Std-A samples had 25~50 nm-thick acicular oxides. The 1000℃-A samples were covered by coarse oxide crystals with a granule diameter of 0.1~0.6 μm having a gross appearance of milky white color, which was identified by XRD as a rutile. On the other hand, 1000℃-V samples showed an Widmansta¨tten structrue of which the orientation of the lattice is formed along crystallographic planes of the parent crystals. On the AFM observation, 530℃-A samples showed RMS roughness of 79.38 nm which is 5 times rougher than those of the As-R samples. Std-A sample had a roughness of 330.47 nm which is about 20-times rougher than that of the As-R sample. 1000℃-A samples were covered by coarse granular oxides and the roughness were about 0.56 μm. Vacuum sub-group samples showed a more smooth surface than air sub-group samples, and the oxide film was more dense. Due to variability of the surface treatment and heat treatment conditions, the process of the oxide formation seems to be affected thereby making the corrosion properties and surface micro-morphology different. However, more various electrochemical analysis together with surface analysis, and an investigation for the effects of those on the osteoblast cell adhesion and calcium phosphate apposition are needed for the improvement of the osseointegration rates of the titanium implants.
임베디드 장치용 사용자 인터페이스 라이브러리 설계 및 개발
김시관,홍상렬,박형순 금오공과대학교 2006 論文集 Vol.27 No.-
임베디드 시스템 장치에서 사용자에게 정보를 제공하고 사용자의 입력을 받기 위한 언터페이스의 중요성은 인터넷의 발전 및 휴대 전화 PDA 등과 같은 개인 정보 접속 장치의 대중화로 점차 커져가고 있다. 개인 정보 접속 장치뿐만 아니라 산업 현장에서 사용되고 있는 임베디드 시스템에서도 장치 제어 및 감시에 사용될 GUI의 요구 증가는 계속 되고 있다. 하지만 임베디드 장치의 제어 및 감시를 위한 GUI 라이브러리의 개발은 아직 미비한 실정이다. 따라서 임베디드 시스템 장치를 제어하고 감시하기 위한 기존의 GUI 라이브러리 보다 더 발전된 Gill 라이브러리를 설계하고 개발하였다. 그리고 새로운 GUI 리아브러리를 이용한 데모 프로그램을 작성하였다.
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.