• 제목/요약/키워드: Ic-tank

검색결과 14건 처리시간 0.017초

마이크로프로쎄서를 이용한 과채류 자동 저장 제어장치의 제작과 온도 자동계측 관리 시스템 (Development of Microprocessor-based Automatic Storage Controller and Temperature Auto-measurement System for Horticultural Crops)

  • 박제균;전재근;이승구;김공환
    • 한국식품과학회지
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    • 제20권6호
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    • pp.845-849
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    • 1988
  • 저장실, 저장상자, 공기분배장치 등을 포함한 실험실 규모의 저장실을 설계, 제작하였다. 과실류를 수용할 수 있는 저장상자(1.7 l)는 투명아크릴을 재질로 일정 공기가 계속해서 순환되도록 하고 저장실은 $0{\sim}30^{\circ}C$ 범위내에서 ${\pm}0.5^{\circ}C$의 정확도로 온도제어가 가능하였다. 저장상자로 유입되는 공기는 공기분배 장치를 통하여 예냉과 공기압의 균일화가 이루어지도록 하였고 Solenoid valve를 사용한 저장상자 선택장치를 제작하였다. 이와 같은 저장시설의 환경제어와 계측을 전담할 수 있는 마이크로프로셰서 시스템을 8 bit 마이크로프로쎄서와 기억장치, 그리고 입출력장치 등의 IC chip을 이용하여 설계 제작하였다. 동 시스템을 활용하기 위하여 저장환경의 제어를 위한 소프트웨어를 개발하고 운영프로그램을 ROM화 할 수 있었다. 제작된 저장 자동제어장치 시스템을 이용 밀감류 저장에 적용하여 저장시설의 운영 및 온도의 자료수집을 성공적으로 수행할 수 있었다.

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CMOS IF PLL 주파수합성기 설계 (Design of a CMOS IF PLL Frequency Synthesizer)

  • 김유환;권덕기;문요섭;박종태;유종근
    • 대한전자공학회논문지SD
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    • 제40권8호
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    • pp.598-609
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    • 2003
  • 본 논문에서는 CMOS IF PLL 주파수합성기를 설계하였다. 설계된 주파수합성기는 칩 외부에 LC 공진 회로를 원하는 값에 맞게 바꿈으로써 다양한 중간 주파수에서 동작 가능하다. VCO는 자동진폭조절 기능을 갖도록 설계하여 LC 공진회로의 Q-factor에 무관하게 일정한 진폭의 출력을 발생한다. 설계된 주파수분주기는 8/9 또는 16/17 dual-modulus prescaler를 포함하며, 다양한 응용분야에 적용 가능하도록 외부 직렬데이터에 의해 동작 주파수를 프로그램할 수 있도록 하였다. 설계된 회로는 0.35㎛ n-well CMOS 공정을 사용하여 제작되었으며, 제작된 IC의 성능을 측정한 결과 260㎒의 동작주파수에서 위상잡음은 -114dBc/Hz@100kHz 이고 lock time은 300㎲보다 작다. 설계된 회로는 3V의 전원전압에서 16mW의 전력을 소모하며, 칩 면적은 730㎛×950㎛이다.

SONET 통신 시스템을 위한 $8{\sim}10.9$ GHz 저 위상 잡음과 넓은 튜닝 범위를 갖는 새로운 구조의 LC VCO 설계 ([ $8{\sim}10.9$ ]-GHz-Band New LC Oscillator with Low Phase-Noise and Wide Tuning Range for SONET communication)

  • 김성훈;조효문;조상복
    • 대한전자공학회논문지SD
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    • 제45권1호
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    • pp.50-55
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    • 2008
  • 본 논문에서는 $0.35-{\mu}m$ CMOS 공정을 이용 $8{\sim}10.9$ GHz 밴드를 갖는 새로운 구조의 LC VCO를 설계 제안하였다. 이 회로 구성은 LC 탱크 기반의 전형적인 NMOS, PMOS cross-coupled 쌍을 병렬로 구성한 새로운 구조로 상보적인 NMOS와 PMOS 꼬리 전류와 같은 MOS cross-coupled쌍과 출력 버퍼로 구성하였다. 본 논문에서 제시한 구조로 설계된 LC VCO는 8GHz에서 10.9GHz까지로 29%의 증가된 튜닝 범위와 6.48mV의 낮은 전력소모를 가지는 것을 확인하였고 이의 core size는 $270{\mu}m{\times}340{\mu}m$, 시뮬레이션을 통한 VCO의 위상잡음은 1MHz와 10MHz offset에서 각각 -117dBc/Hz와 -137dBc/Hz이다. FOM은 10GHz의 중심 주파수으로 부터 1MHz offset에서 -189dBc/Hz를 가진다. 제안한 설계방법은 10Gb/s급의 클럭과 데이터 복원회로 그리고 SONET 통신응용에 매우 유용하다.

한미간(韓美間) 정보통신분야(情報通信分野) 통상마찰예방(通商摩擦豫防)과 해소방안(解消方案)에 관한 연구(硏究) (A study on The U.S.-Korean Trade Friction Prevention and Settlement in the Fields of Information and Telecommunication Industries)

  • 정재영
    • 무역상무연구
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    • 제13권
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    • pp.869-895
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    • 2000
  • The US supports the Information and Communication (IC) industry as a strategic one to wield a complete power over the World Market. However, several other countries are also eager to have the support for the IC industry because the industry produces a high added value and has a significant effect on other industries. Korea is not an exception. Korea recently succeeded in the commercialization of CDMA for the first time in the world, after the successful development of TDX. Hence, it is highly likely to get tracked by the US. Although the IC industry is a specific sector of IT, there is a concern that there might be a trade friction between the US and Korea due to a possible competition. It will be very important to prepare a solution in advance so that Korea could prevent the friction and at the same time increase its share domestically and globally. It will be our important task to solve the problem with the minimum cost if the conflict arises unfortunately in the IT area. The parties that have a strong influence on the US trade policy are the think tank group and the IT-related interest group. Therefore, it would be important to have a close relationship with them. We found some implications by analyzing the case of Japan, which has experienced trade frictions with the US over the long period of time in the high tech industry. In order to get rid of those conflicts with the US, the Japanese did the following things : (1) The Japanese government developed supporting theories and also resorted to international support so that the world could support the Japanese theories. (2) Through continual dialogue with the US business people, the Japanese business people sought after solutions to share profits among the Japanese and the US both in the domestic and in the worldwide markets. They focused on lobbying activities to influence the US public opinion to support the Japanese. The specific implementation plan was first to open culture lobby toward opinion leaders who were leaders about the US opinion. The institution, Japan Society, were formed to deliver a high quality lobbying activities. The second plan is economic lobby. They have established Japanese Economic Institute at Washington. They provide information about Japan regularly or irregularly to the US government, research institution, universities, etc., that are interested in Japan. The main objective behind these activities though is to advertise the validity of Japanese policy. Japanese top executives, practical interest groups on international trade, are trying to justify their position by direct contact with the US policy makers. The third one is political lobby. Japan is very careful about this political lobby. It is doing its best not to give impression that Japan is trying to shape the US policy making. It is collecting a vast amount of information to make a correct judgment on situation. It is not tilted toward one political party or the other, and is rather developing a long-term network of people who understand and support the Japanese policy. The following implications were drawn from the experience of Japan. First, the Korean government should develop a long-term plan and execute it to improve the Korean image perceived by American people. Second, the Korean government should begin public relation activities toward the US elite group. It is inevitable to make an effort to advertise Korea to this elite group because this group leads public opinion in the USA. Third, the Korean government needs the development of a relevant policy to elevate the positive atmosphere for advertising toward the US. For example, we need information about to whom and how to about lobbying activities, personnel network who immediately respond to wrong articles about Korea in the US press, and lastly the most recent data bank of Korean support group inside the USA. Fourth, the Korean government should create an atmosphere to facilitate the advertising toward the US. Examples include provision of incentives in tax on the expenses for the advertising toward the US and provision of rewards to those who significantly contribute to the advertising activities. Fifth, the Korean government should perform the role of a bridge between Korean and the US business people. Sixth, the government should promptly analyze the policy of IT industry, a strategic area, and timely distribute information to industries in Korea. Since the Korean government is the only institution that has formal contact with the US government, it is highly likely to provide information of a high quality. The followings are some implications for business institutions. First, Korean business organization should carefully analyze and observe the business policy and managerial conditions of US companies. It is very important to do so because all the trade frictions arise at the business level. Second, it is also very important that the top management of Korean firms contact the opinion leaders of the US. Third, it is critically needed that Korean business people sent to the USA do their part for PR activities. Fourth, it is very important to advertise to American employees in Korean companies. If we cannot convince our American employees, it would be a lot harder to convince regular American. Therefore, it is very important to make the American employees the support group for Korean ways. Fifth, it should try to get much information as early as possible about the US firms policy in the IT area. It should give an enormous effort on early collection of information because by doing so it has more time to respond. Sixth, it should research on the PR cases of foreign enterprise or non-American companies inside the USA. The research needs to identify the success factors and the failure factors. Finally, the business firm will get more valuable information if it analyzes and responds to, according to each medium.

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