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$BaTiO_3$ 입자 함량이 에폭시/$BaTiO_3$ 복합 내장형 커패시터 필름의 유전상수에 미치는 영향
조성동,이주연,현진걸,이상용,백경욱,Cho Sung-Dong,Lee Joo-Yeon,Hyun Jin-Gul,Lee Sang-Yong,Paik Kyung-Wook 한국마이크로전자및패키징학회 2004 마이크로전자 및 패키징학회지 Vol.11 No.2
[ $BaTiO_3$ ]분말의 양과 에폭시/$BaTiO_3$ 복합 내장형 커패시터 필름의 유전상수와의 관계를 살펴보고 이에 대해 고찰하였다. 이를 위해 $BaTiO_3$ 분말의 함량에 따른 에폭시/$BaTiO_3$ 복합 내장형 커패시터 필름의 밀도 변화와 필름의 표면 및 단면 모습을 관찰하였다. 또한 $BaTiO_3$ 분말의 함량을 높이기 위한 여러 가지 bimodal 조합에 따른 에폭시/$BaTiO_3$ 복합 내장형 커패시터 필름의 유전상수 변화를 관찰하였다. 단일 입자를 이용한 unimodal의 경우 유전상수가 가장 높게 측정된 $S_4$ 분말을 이용하여 얻을 수 있었던 유전상수의 최대값은 약 60 이었다. 최대값보다 과량의 $BaTiO_3$ 분말을 첨가하였을 경우, 에폭시/$BaTiO_3$ 복합 내장형 커패시터 필름의 유전상수가 감소하는데, 이는 과량의 분말을 수용하기 위해 생성된 기공에 의한 것이었다. Bimodal 조합의 경우 가장 큰 분말과 가장 작은 분말의 조합인 $S_5+C_1$ 조합이 $75\;vol\%$의 가장 많은 양의 분말을 넣어 가장 높은 유전상수 90 을 얻는데 성공하였다. We investigated the effect of $BaTiO_3$ powder content on the dielectric constant of epoxy/$BaTiO_3$ composite embedded capacitor films (ECFs). Variations of the dielectric constant of epoxy/$BaTiO_3$ composite ECFs with unimodal $BaTiO_3$ powder content were measured. To explain this result, density of the ECFs was measured, and surface and cross section images of the ECFs were observed. In addition, variations of the dielectric constant of epoxy/$BaTiO_3$ composite ECFs with various bimodal combinations were measured. In the case of unimodal powder, the maximum dielectric constant was about 60 at $60\;vol\%$ S4 powder. And more powder addition lowered the dielectric constant of the ECFs, which was due to voids or pores formation by excess $BaTiO_3$ powder. In the case of bimodal combination, $75vol\%\;BaTiO_3$ powder loading and the dielectric constant of 90 were achieved using $S_5+C_1$ combination, biggest and smallest powder combination.
조성동(Sung-Dong Cho) SBS 2010 미디어경제와 문화 Vol.8 No.2
이 연구는 텔레비전과 시청자의 시간성 논의를 기반으로 방송의 구조적 채널 확장과 시청자 세부집단의 시간대별 시청 특성을 고려해 시청행태의 다면적 변화를 논의하고자 했다. AGB닐슨의 연도별 시청량 자료를 토대로 분석한 결과, 우선, 채널의 구조적 확장에 따라 시청자들은 이용채널의 수를 전반적으로 늘려왔지만, 세부 집단별 증감패턴에서는 차이가 나타나 채널이용의 획일적인 변화와는 다른 특성이 확인되었다. 다음, 시청자의 시간성을 고려해 시청시간대를 오전(이른오전, 늦은오전), 오후, 저녁(이른저녁, 늦은저녁), 심야로 구분하여 연도별 비교를 시도한 시간대별 시청패턴에서는 세부집단에 따라 다면적 증감패턴이 확인되고 있었다. 마지막으로 시청자의 일상생활이 반영된 직업별 집단을 기준으로 주요 시간대의 시청행태 동시화 여부를 확인한 결과 시청패턴의 유사성은 있었지만 세부집단의 주요시청 시간대 구성에서는 차이가 나타나 텔레비전 시청이 동시적이라고 보기는 힘들었다. 다만, 시청자들의 ‘늦은저녁’ 시간대 시청이 줄어들고, 학생층의 저녁 시청대가 ‘고원화’ 되는 경향이 확인되고 있어 동시적 시청에 대한 지속적인 확인이 요구된다. The purpose of this study is to try to discuss multi-phase changes of audience’s television viewing patterns. The results of analysis, firstly, audience watch more channels by broadcasting channel expansion, but there are various disparities of viewing channel number in each sub-group. Secondly, the result of annual comparisons on subgroup viewing features confirms various viewing time fluctuations in 6 time-zones. Lastly, this study analyzed the synchronization of viewing behaviors in 6 time-zones according to 5 working groups that reflect audience’s social life-rhythm. In the result, there is a similarity of viewing time formation, but it is difficult to insist that the similarity is synchronization of audience’s viewing behaviors because of disparities of primary viewing time-zone formation. However, given decrease viewing time and viewing planation of younger generation in the late evening time-zone, it is clear that we need to study more on whether this synchronization of viewing behaviors will be formed in the future or not.
조성동(Sung Dong Cho),김정준(Jeong Joon Kim),김형진(Hyung Jin Kim),팽재필(Jae Phil Paeng),박지훈(Ji Hoon Park),권순영(Soon Young Kwon),최종욱(Jong Ouck Choi),안덕선(Deok Sun Ahn),정광윤(Kwang Yoon Jung) 대한두경부종양학회 2002 대한두경부 종양학회지 Vol.18 No.1
Background: Free flaps have become a very important role in the ablative head and neck surgery with functional preservation of defect sites. The forearm free flap has many advantage of lack of bulk, ease of dissection, vascularity, and malleability. Patients and Methods: A review of 51 radial forearm free flaps performed between may 1990 and feburary 2001 at the Korea University was undertaken to determine outcome. Patient age ranged 27 to 72 years (mean 56). There were 44 men and 7 women. The most prevalent neoplasm was squamous cell carcinoma. Results: The tans verse cervical artery and the external jugular vein were the most frequent receipient sites for microvascular anastomosis. Total flap loss occurred in 2 cases (4%) and other complications were seen in 42%. Fifteen patients received preoperative irradiation and the complication was higher than non-irradiation patients, but statistically not significant. Conclusion: The radial forearm free flap offers a variety of reconstructive options for head and neck. Its low flap loss and complication rates offer the best choice for reconstruction of defect of head and neck malignancy.
조성동(Sung-Dong Cho),강남준(Nam-Jun Kang) 한국언론학회 2008 한국언론학보 Vol.52 No.4
The purpose of this paper is to examine audience’s viewing patterns in a multichannel era. This study tried to conceptualize some of using pattern features through literature reviews and analyze rating data collected by AGB Nielsen Media Research to overcome limitations of past researches which mostly have relied on retrospect survey data. In the result, first(RQ1), the size of repertoires has increased since 2003 in Korea, but the concentration ratio(MCR) of using channels has increased from 2003 to 2007. Especially, terrestial repertoire has been continually decreased, but cable-repertoire diametrically opposed to that. Next, this study has found that past researches couldn’t describe practical primary channel repertoires because of retrospect methods. Second(RQ2), since there have been various composition disparities of channel-repertoires and disparities of channel-repertoire adoption ratio through demographic variables, the possibility of audience polarization has been confirmed. Next, the Lorenz curve has described that audience concentration came out in terrestial broadcastings regardless of year. Namely, the top 4 channels still account for high level ratio of share, though the concentration was declining annually. Particularly, through the result being compared from top 20 channels between a rank of channel-repertoire adoption ratio and a rank of share each channel, this study confirmed that 19 channels were exactly same in the 20th rank. In accordance with this result, its obvious that channel-repertoire composition disparities have been connected to audience concentration. Consequently, this study confirmed that diverse using disparities were in channel-repertoire and proved that channel-repertoire composition disparities have been connected to audience concentration and polarization.
다매체 수용자의 장르 선호와 장르 이용에 따른 정치사회적 영향에 대한 연구
조성동(Sung-Dong Cho),김규찬(Kyu Chan Kim),강남준(Nam-Jun Kang) 한국언론학회 2010 한국언론학보 Vol.54 No.1
Audience’s media using patterns are more complicated than ever with the changes in the media environment, and they can select genre according to their content preferences whenever they want. This is especially the case for multi-channel TV(cable & satellite, IPTV, DMB) and Internet hypertext, which multi-media functions offer varied options to us. Given that, over those media and channels, program choice has increased rapidly in the last decade, audience’s polarized program consumption means that they can avoid some contents whenever they wish not to watch them. Here, much of the concern about audience’s political and social problems stems from in this new media environment. The purpose of this study is to examine how genre preference and usage contributed to increase political knowledge and political efficacy, and to determine the disparities of political knowledge and political efficacy between two groups(news-social and drama-entertainment preference groups). This study analyses 1,353 individual’s panel of one source data(ID ordering) which was collected by TNS Korea(people-meter rating data & telephone survey data) using descriptive, t-test, hierarchical regression of SPSS package. The results suggest that the increased gap in the political knowledge and political efficacy according to the genre preference has disparities in a significant level. And genre usage as a predictor related to the effects on political knowledge in spite of controled demographic and media usage variables, but not political efficacy.