• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 B
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• pp.735-739
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• 2003

This paper presents a direct seek control algorithm for swing-arm type dual stage servo system that consists of a coarse actuator and a fine actuator. The proposed scheme is to design a control system that attenuates the effect of dynamic coupling between the two actuators so that the seek operation can be performed in a single-shot with stability. In an optical drive system with dual stage servo mechanism, the effect of dynamic coupling between the two actuators needs to be handled during the coarse seek operation due to its inherent structure. In an extreme case, the two actuators can collide each other, which leads to critical degradation of the seek performance. To handle this problem, our proposed control scheme is to generate the drive signals such that the two actuators behave as if they are a single fixed body. To this end, a feedforward controller and two feedback controllers are designed that enable the current drive system perform wide range of track seek. Simulation results are provided to show the validity and feasibility of our proposed algorithm.

• 한국응용약물학회:학술대회논문집
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• 한국응용약물학회 1996년도 춘계학술대회
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• pp.186-186
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• 1996

Streptococcus pneumoniae (pneumococcus), the most common cause of bacterial pneumonia, has an ample polysaccharide(PS) capsule that is highly antigenic and is the source of PS vaccine. This investigation was undertaken to optimize the culture conditions for the production of capsular PS by type 1 pneumococcus. Among several culture media, brain heart infusion (BHI) and Casitone based media were found to support luxuriant growth of pneumococcus type 1 at the same level. Because BHI medium is rather expensive and more complex than the Casitone based media, the Casitone based media was used to study optimization of the culture condition. The phase of growth which accomodated maximum PS production was logarithmic phase. Concentrations of glucose greater than 0.2% did not enhance growth or PS production. Substitution of nitrogen sources with other resources or supplemention of various concentrations of metal ion (with the exception of calcium ion) had adverse effects on growth and PS production. On the other hand, low level aeration was beneficial for increased PS production. Addition of 3 mg/I concentration of methionine, phenylalanine, and threonine were found to enhance growth and PS production. The synergistic effect of all the favorable conditions observed in pneumococcal growth assays provided a two-fold cumulative increase in capsular PS production.

• 한국디자인학회:학술대회논문집
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• 한국디자인학회 2002년도 봄 학술발표회 논문집
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• pp.260-261
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• 2002

• 한국응용약물학회:학술대회논문집
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• 한국응용약물학회 1993년도 제2회 신약개발 연구발표회 초록집
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• pp.144-144
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• 1993

한국에서 유행하는 페염균 type을 결정하기 위한 기초 실험을 수행하여 서울대병원과 서울중앙병원의 환자로부터 분리한 88개의 폐염균주를 담즙산에 의한 용해도 및 Optochin에 대한 민감성 등을 측정하고 폐염균의 type을 결정하기 위해서 Double diffusion, Countercurrent immunoelectrophoresis, Rocket immunoelectrophoresis 방법 등으로 폐염균 항혈청과 반응하였다. 또한 ATCC로부터 구입한 폐염균주를 이용하여 배지조성의 변화에 따른 폐염균 생장을 측정하기 위해 CAT broth, Brain Heart Infusion broth, Defined Media에서 3가지 type의 균주(Type I, III, IV)를 접종하고 37$^{\circ}C$에서 배양하면서 1시간마다 550nm에서 흡광도를 측정하였다. 3가지 type (Type I, III, IV)의 폐염균주로부터 협막다당류를 phenol Iysis 추출법으로 폐염균 Capsule 다당류의 분리하여 Total Sugar 함량, Uronic acid 함량, 0-Acetyl 함량, 단백질 함량, 핵산 함량, 분자량분포 Countr-current immunoelectrophoresis 등을 실시하여 폐염균 백신 규격에 부합되는지 확인하였다. 수집한 88개의 폐염균주가 모두 담즙산에 의해 용해되고 6mm Optochin disc를 사용하였을때 성장 저지원이 모두 14mm 이상으로 나타나 감수성이 있어서 폐염균임을 확인하였으며 폐염균의 type 결정에 필요한 방법을 설정하였다. 배지조성에 따른 폐염균의 생장을 측정한 결과 CAT broth 에서는 Type I만이 잘 배양되었고 Type III, IV는 늦게 배양되었으나, Brain Heart Infusion broth에서는 3가지 Type이 모두 잘 배양되었고, Defined Media 에서는 Type I만이 성장되었을 뿐 나머지 두 Type은 배양되지 않았다. 본 실험방법으로 분리된 폐염균 다당류는 폐염균 백신 규격중의 6가지 항목에서 적합하였으며 Statens(Denmark)로부터 구입한 항체와 뚜렷한 침강선을 나타내었다.

• 한국콘텐츠학회논문지
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• 제10권3호
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• pp.294-300
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• 2010

매체와 미디어 기술이 발전하면서 정치에 영향을 미칠 수 있는 매체로 TV를 대신해 인터넷 공간인 넷 (Net)을 매개로 활발하게 작동하고 있는 UCC가 새로운 미디어로 주목받고 있다. 바야흐로 TV의 일방적인 매체 영향력이 인터넷 시대로 넘어오면서 미디어 주도권은 쌍방향 상호작용성을 특징으로 한 UCC로 급격하게 변동하고 있는 것이다. 특히 UCC는 그 자체가 가지고 있는 콘텐츠의 참신함과 동시에 지금까지 미디어의 수용자 역할을 담당했던 국민 스스로를 막강한 정치적 영향력이 있는 주체로 변화시켰다는 특징이 있다. 본 논문에서는 미디어와 매체의 변화가 이끄는 새로운 세상과 그 세상의 중심에서 세상을 새롭게 투영하고 나아가 사회를 변화시키는 데 강력한 힘을 발휘하고 있음을 주목하고, 일상의 정치뿐만이 아닌 정치적 실행력에 있어서 영향을 미칠 수 있는 UCC의 다양한 정치적 영향 유형을 연구하고자 한다. 그리하여 UCC가 선거를 비롯한 다양한 정치적 상황에서 어떤 정치적 영향을 미칠 수 있는 유형을 분석해 봄으로써 UCC가 정치현장에서 미칠 수있는 정치적 영향력과 파급력에 대해서 모색하고자 하였다. 그 결과 UCC의 유인폭발, 이슈주도, 분산전환, 지시순종 등의 4가지 상황으로 유형화할 수 있었다. 이는 곧, 넷(Net)시대의 디지털 기술을 통해서 직접민주주의 구현에 기여하는 것과 같이 정치현장에 있어서도 쌍방향 소통의 긍정적 효과를 불러온다고 하겠다.

• 대한가정학회지
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• 제42권1호
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• pp.181-195
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• 2004

The purpose of the study was to explore the degree of children's access to media and the relationship between the use of media and language development of Korean-Chinese bilingual children in Yanji, China. Questionnaires were answered by 258 4th graders and their parents. The results showed that the children had an access to a variety of media. The children's use of language(Korean/ Chinese) differed to the type of media： they had more access to Korean language in the use of newspapers/magazines, books, and radio, and to Chinese language in the use of computer. They had comparatively a balanced access to Korean/chinese language in the use of TV. Stepwise regression analyses revealed that the children's access to Chinese language in the use of media, proficiency of a parent's Chinese language, and a parent's affection were related to proficiency of the children's Chinese language. Implications are derived from the use of media in development of bilingualism.

• 한국실내디자인학회논문집
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• 제20권6호
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• pp.183-191
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• 2011

This study is to set up the appropriate range of observation time through contemplating the characteristics of observation time run for the information acquisition of space. The conclusions reached through this study are as the followings. First, this study could find out that even though the evaluation elements on the three types for image evaluation were the same, the information acquisitions were different as those types varied. On the other hand, the change of the average run-time by type for the information acquisition was found not to be big, in other words, even though the run-time was alike, the information acquisitions varied depending on the type. Second, he evaluation by language media showed the average value by element had the order of [shape>position>number>existence] and the range of their run-time was 94.6~102.9 seconds. The average rate of information acquisition shown at the visual media had the order of [composition>shape>material&color] and the range of run-time was 93.1~99.7 seconds. Third, the evaluation by language media showed that for male subjects the range of information acquisition rate was 39.1~91.4% and that of run-time 85.1~106.0 seconds and for female ones 46.0~94.6% and 96.3~112.3 seconds respectively. In case of the visual media, male subjects showed the range of information acquisition rate was 40.3-66.7% and the range of run-time 82.4~97.9 seconds and the female ones, 42.2~71.0% and 94.0~115.1 seconds respectively, through which we could see that at the evaluation by language media and visual media both the female's range of information acquisition and that of observation time were higher than the male's.

• 한국균학회지
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• 제35권1호
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• pp.37-42
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• 2007

잣버섯 균사체 배양에 적합한 생물반응기는 풍선형의 공기부양식의 생물반응기가, 수용성 다당체의 생산에도 생장이 좋았던 풍선형 공기부양식 생물반응기가 유리한 것으로 나타났다. 배지의 탄소원 농도별에 따른 수용성 세포외 다당체의 생산량은 농도 처리간 차이가 없었으나 수용성 세포내 다당체는 탄소원 농도가 낮은 즉 C/N율이 낮을수록 증가하였다. 잣버섯 균사체는 고농도의 배지 배양조건에서 생물반응기내로 배지 공급형태가 배지량 증가방법보다 배지농도 조절에 의한 연속 배양방법이 우수한 것으로 나타났다.

• International journal of advanced smart convergence
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• 제6권2호
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• pp.34-50
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• 2017

This study delved into the effects of labor union members' social media utilization for the formation of labor union social capital. Specifically, this study aimed to identify the effects of labor union-related social media use and participation on the labor union's social capital formation through quantitative and qualitative research. It set up trust, network, and participation as social capital components and as dependent variables. Network, in particular, was divided into bonding and bridging aspect. There is the correlation between labor union-related social media use and the formation of labor union social capital. As participation in the group type social media operated by a labor union becomes more active, evaluation on labor union social capital throughout trust, network, and participation is higher. Especially, the correlation between bonding network and bridging network was high. This proves that a labor union's bond enhancement does not result in the labor union's selfishness, but it can build a cooperative system with an external network.

• 상하수도학회지
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• 제20권6호
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• pp.837-848
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• 2006

This paper presents the test results of biological aerated filtration(BAF) process to replace activated sludge process by enhancing treated effluent quality and reducing the costs. In BAF process both BOD and SS compounds in wastewater are degraded and removed by biological reaction and filtration. Upflow BAF with expanded polypropylene media and downflow BAF with ceramic media were used to investigate the effects of hydraulic and organic loads on effluent quality. As a result, in BAF processes which has different media, upflow BAF reactor shows 5% higher efficiency than downflow BAF and this phenomena caused by backwashing methods and operational conditions. The results of influence factors analyzed by Factor Analysis Method in BOD and SS treatment efficiency are the size of media, hight of media bed and type of media. The quantitative effects of media size are 5.73% in TBOD, 5.78% in SBOD and 7.65% in TSS, so we confirmed the main factor is media size.