• Title, Summary, Keyword: CAD

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Characterization of cadC and cadR Mutants in Mediating the Expression of the Salmonella typhimurium cadBA Operon (Salmonella typhimurium cadBA 오페론의 발현에 관여하는 돌연변이체의 선별 및 그 특성)

  • 방성호;박용근
    • Korean Journal of Microbiology
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    • v.37 no.4
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    • pp.259-264
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    • 2001
  • It has been well known that the expression of S. typhimurium cadBA operon requires at least two extracellular signals: low pH and high concentration of lysine. To better understand the nature of pH-dependent and lysine dependent signal transduction, mutants were isolated in JF2238(cadA-lacZ) by Tn10 insertion, spontaneous mutagenesis, and EMS treatment. Two mutants were isolated from JF2238, expressed as a cadA-lacZ operon fusion in various growth conditions, and analyzed to have mutations in cadC, a gene encoding a function necessary for transcriptional activation of cadBA. One isolate (cadC6) conferred pH-independent and lysine-independent cadBA expression and the other(cadC4) showed pH-independent and lysine-dependent cadBA expression. cadR::Tn10 and cadR4 mutants were expressed in the absence of exogenously added lysine. They were also resistant to thiosine and complemented by lysP clone from E. coli. Thus, in the absence of exogenous lysine, cadR is a negative regulator of cadBA expression. Cadaverine, the product of lysine decarboxylation, was shown to inhibit expression of cadA-lacZ fusion in cad $C^+$ cell.

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A Study of System Architecture for Intelligent Responsive Space (지능형 반응 공간 기술 개발을 위한 시스템 아키텍처)

  • Yeom, Ki-Won;Lee, Joong-Ho;Lee, Seung-Soo;Eom, Ju-Il;Park, Joon-Koo;Kim, Rae-Hyeon;Jo, Hyeon-Cheol;Kim, Geon-Hui;Gwon, Mi-Su;Yu, Ho-Yeon;Son, Yeong-Tae;Pyo, Jeong-Guk;Kim, Tea-Su;Park, Myeon-Ung;Park, Se-Hyeong;Ha, Seong-Do;Park, Ji-Hyung
    • 한국HCI학회:학술대회논문집
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    • pp.854-858
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    • 2006
  • 디지털화의 가속, 고속 통신 인프라의 확대 등으로 전자, 정보 통신 기기들이 단일 네트워크로 연결되어 영상 및 음향 정보를 서로 공유할 수 있으며, 생활 공간 내에서 실생활의 질 향상을 위한 지능적 정보 서비스와 자연스럽고 편한 내추럴 인터페이스 기술에 의한 지능형 반응 정보 서비스 공간 기술이 중요한 이슈로 등장하고 있다. 본 연구에서는 지능형 반응 공간의 물리적 객체로서 학교, 연구 기관 및 회사 등의 회의실을 선정한다. 그리고, 이를 대상으로 회의 참여자들이 자연스럽고 편리하게 의견 교환, 관련 자료 및 정보 처리를 할 수 있는 시스템 구축을 위한 아키텍처에 대하여 논의한다. 본 연구에서 제안하는 시스템 아키텍처는 회의와 관련된 문서나 회의 내용 등의 정보를 실감 가시화 노드로 추상화되고 메타 정보화함으로써 전체 회의 내용의 파악과 회의 정보에 대한 체계적이고 논리적인 관리를 가능하게 한다. 또한 여러 사람의 공동 작업을 필요로 하는 정보 또는 문서에 대한 동시 편집 기능과 자연스러운 동작에 의한 데이터 조작을 지원하는 실감 워크벤치 및 워크스크린 기술, 정보 핸들링의 다양성과 조작의 편리성을 위한 실감 아이콘에 의하여 자연스럽고 편리한 회의를 가능하게 한다. 그리고, 이러한 요소 기술들이 에이전트에 의해 회의 프로세스 및 요소 기술들의 시스템적 통합을 가능하게 한다.

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Cloning and Sequencing Analysis of cadC Encoding Transcriptional Activator CadC from Salmonella typhimurium

  • Kim, Bae-Hoon;Lee, Ho-Jeong;Lee, In-Soo;Bang, Sung-Ho;Kim, Joon;Park, Yong-Keun
    • Journal of Microbiology
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    • v.39 no.2
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    • pp.109-115
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    • 2001
  • Salmonella typhimurium possesses a cad operon, which contributes to an adaptive response against an acidifying environment. In Escherichia coli, the activation of the cad operon is dependent on cadC, which is located upstream of the operon. However, the activator of cad operon in S. typhimurium has not been known until now. In this study, we selected a putative cadC mutant by trasposon mutagenesis and cloned the cadc of S. typhimurium. Moreover, the cadC mutant was complemented by cadC clone. The cadC gene from S. typhimurium LT-2 consists of 1539 bp encoding a polypeptide ob 512 amino acids, and shows sequence similarity to cadC of E. coli with 53% identity and 67% similarity. The hydrophobicity profile of th S. typhimurim CadC sequence is very similar to E. coli CadC.

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Activation of the Vibrio vulnificus cadBA Operon by Leucine-Responsive Regulatory Protein is Mediated by CadC

  • Rhee, Jee-Eun;Kim, Kun-Soo;Choi, Sang Ho
    • Journal of Microbiology and Biotechnology
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    • v.18 no.11
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    • pp.1755-1761
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    • 2008
  • The present study revealed that Lrp, a leucine-responsive regulatory protein, is involved in the regulation of cadBA transcription through activation of $P_{cadBA}$. The influence of Lrp on $P_{cadBA}$ was mediated by CadC, and thereby, CadC was able to compensate for the lack of Lrp in the activation of $P_{cadBA}$. Western blot analyses and EMSA demonstrated that the cellular level of CadC was not significantly affected by Lrp, and that Lrp exerted its effect by directly binding to $P_{cadBA}$. These combined results suggested that CadC and Lrp function cooperatively to activate the $P_{cadBA}$ rather than sequentially in a regulatory cascade.

The Present Situations of the Apparel CAD Education in Clothing Departments in Domestic Colleges (국내 의류학분야 학과의 어패럴CAD 교육현황)

  • Kim, Su-Hyun;Lee, Song-Ja
    • Fashion & Textile Research Journal
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    • v.1 no.1
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    • pp.26-33
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    • 1999
  • Nowadays the Apparel CAD is required in the clothing industries. So many domestic Apparel education institutions are interested in the Apparel CAD education. By investigating the present Apparel CAD education situations in college, the writer shows some data that are helpful to solve the problems in these parts. The purpose of this study is to give some helps in teaching the Apparel CAD in college. The results of this study are as followings, as the use of CAD systems is growing in the clothing industries, many colleges are concerned with the Apparel CAD. As a result, many colleges equip the Apparel CAD systems and the Apparel CAD is taught as special lectures, the part of other courses or regular course in many colleges. Apparel CAD should be taught as a regular course in colleges. And it should be taught systematically with Design CAD and Pattern CAD. But it is taught limitedly as special lectures, the part of other courses and post graduate studies. So it is impossible to educate the students professionally. As many colleges the CAD equipments are not opened to the students, the student's use of CAD systems are limited, so educational environment needs to improve to use CAD systems freely.

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Survey on CAD Softwares Used in Small Contractors and Improvement to College CAD Education (중소규모 건설회사 CAD 활용현황과 대학교육 방안)

  • Choi, Heebok;Jang, Myung-Houn
    • Journal of the Korea Institute of Building Construction
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    • v.16 no.2
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    • pp.169-175
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    • 2016
  • A survey of small-size contractors in Jeju was conducted to investigate college graduate's CAD (computer aided design) competence. Most of small-size contractors use CAD softwares to review and update drawings submitted from an architect. This research analyzed the curriculum of the architectural engineering in several national universities. The CAD classes have 4 or 6 hours per week and use AutoCAD primarily. This research proposes that a CAD class needs at least 6 hours per week, 2D drawing is the main theme in the curriculum, and exercises to make 3D models are also included in the CAD class. The improved methods, Internet cafe and real time feedbacks using a smartphone, to evaluate the reports and exercise results are necessary.

A Study on Environment and Perception of CAD by Undergraduate Students in the Dept. of Architecture - Case study on Undergraduate Students - (대학(大學) 건축학과(建築學科) 재학생(在學生)의 CAD 환경(環境) 및 인식(認識)에 관한 연구(硏究) - 사례대학의 재학생을 대상으로 -)

  • Yoo, Chang-Geun;Park, Sung-Ha
    • Journal of The Korean Digital Architecture Interior Association
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    • v.1 no.1
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    • pp.24-30
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    • 2001
  • This study conducts a questionnaire with undergraduate students in the Dept. of Architecture who will lead the architectural field in future, examines environment and perception of CAD in their home and universities and aims at supplying the data required for setting CAD educational index and building its use environment, and it could obtain the following results. Individual CAD environment of undergraduate students in the Dept. of Architecture reach a considerable level in hardware part, but they don't have the same level in software part as the hardware and use illegal copy programs. It is shown that they spend their time in using CAD for five to eight hours a week and its main purposes are to perform a project related to architectural design or make report requiring drawing. Major places using CAD are CAD room in university or public PC room equipped with CAD compared to their own houses and most of them have a negative recognition of the convenience of its use. Their satisfaction with CAD use is considerably high and when they submitted their assignments of architectural design project by means of CAD, they had a positive evaluation from their professors and they have such hopes that 'Korean Support Strengthening', 'lowering price through version supply for students' and 'diversification of design symbol' in CAD S/W, and especially, most of respondents have an intention to purchase the original goods when version only for students will be marketed in future. Accordingly, for a qualitative improvement of CAD environment for undergraduate students in the Dept. of Architecture, universities must be equipped with the various types of CAD S/W and Applications and students' opportunity to access them should be increased. In addition, a method which can enhance using convenience of CAD room and PC room is required and CAD related S/W developers must market the version for students which consider the reality of undergraduates in Korea properly with an appropriate price level in order to settle a sound S/W culture.

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CAD/CAPP System based on Manufacturing Feature Recognition (제조특징인식에 의한 CAD/CAPP 시스템)

  • Cho, Kyu-Kab;Kim, Suk-Jae
    • Journal of the Korean Society for Precision Engineering
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    • v.8 no.1
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    • pp.105-115
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    • 1991
  • This paper describes an integrated CAD and CAPP system for prismatic parts of injection mold which generates a complete process plan automatically from CAD data of a part without human intervention. This system employs Auto CAD as a CAD model and GS-CAPP as an automatic process planning system for injection mold. The proposed CAD/CAPP system consists of three modules such as CAD data conversion module, manufacturing feature recognition module, and CAD/CAPP interface module. CAD data conversion module transforms design data of AutoCAD into three dimensional part data. Manufacturing feature recognition module extracts specific manufacturing features of a part using feature recognition rule base. Each feature can be recognized by combining geometry, position and size of the feature. CAD/CAPP interface module links manufacturing feature codes and other head data to automatic process planning system. The CAD/CAPP system can improve the efficiency of process planning activities and reduce the time required for process planning. This system can provide a basis for the development of part feature based design by analyzing manufacturing features.

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Windows 시대의 퍼스널 CAD

  • 광성풍명;김석일
    • CDE review
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    • v.2 no.1
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    • pp.1-6
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    • 1996
  • CG 등의 컴퓨터 지원에 의한 도형처리 시스템 중에서 특히 설계제도를 지원하는 시스템으로서 CAD가 제공되고 있다. CAD에는 대형 컴퓨터를 플랫폼으로 하는 메인프레임(집중형) CAD와 EWS(엔지니어링 워크 스테이션)을 플랫폼으로 하는 EWS/CAD 및 퍼스널 컴퓨터를 베이스로 한 퍼스널 CAD가 있는데 최근에 컴퓨터의 고성능화와 소형화의 흐름에 따라 퍼스널 CAD가 CAD의 주류로 되고 있다. 그 큰 요인으로서 퍼스널 CAD는 하드웨어 및 소프트웨어를 포함한 시스템 가격이 EWS/CAD 등을 비롯한 다른 CAD에 비하여 저렴한 가격대라는 것과 조작성이 우수하다는 점을 들 수 있다. 또한 최근에는 OS(Operating System: 컴퓨터를 움직이기 위한 기본적 소프트웨어)의 주류가 싱글 유저.싱글 태스크인 MS-DOS(이하 DOS라 한다)에서 싱글 유저.의사 멀티 태스크인 MS-Windows(이하 Windows라 한다)에로 이행하고 있으며 퍼스널 CAD도 그에 대응하는 것으로 되고 있다. 여기서는 이 Windows에 대응하는 퍼스널 CAD의 최신의 기술동향 및 OS에 대하여 설명한다.

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CAD Data Exchange among Different Commercial Packages (이 기종 시스템간의 CAD 데이터 교환)

  • Kim, Tae-Wook;Hwang, Byeong-eok
    • Journal of the Korean Society of Industry Convergence
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    • v.7 no.4
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    • pp.377-382
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    • 2004
  • This research was about implementing STEP for data exchange among different commercial package(CAD system). STEP was used to share CAD data as follows. ST-Developer implement Solid model was used with a physical file of STEP and represented in a CAD system. And then STEP conversion utility was used to make a neutrality format form in a component modeling. Analysis of Solid model was made possible for CAD system to read in and analyzed Solid model. This research are summarized as follows 1. A basis Model development used Visual C++ for a neutrality data of a programming interface general-use CAD system, and produced Box and Cylinder to a physical file, the result was implemented this in a programming interface to general-use CAD system, it is represented in CAD system as identical one modeling object. 2. STEP was used in different CAD system to utilize to its of each CAD system maximum, CATIA V5R9 user was able to analyze MDT 6 Modeling Arm. 3. STEP was used able to interpret and remodel the existing Solid model.

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