저장매체 스트리밍에서 substream에 기초한 비순차 패킷 스케줄링

최수정,안희준,강상혁,Choi Su Jeong,Ahn Hee June,Kang Sang Hyuk 한국통신학회 2004 韓國通信學會論文誌 Vol.29 No.10C

이 논문에서는 스트리밍 미디어에 대해 속도 대비 왜곡을 최적화하는 패킷 스케줄링 알고리듬을 제안한다. 수신단은 패킷을 받으면 ACK를 보내는데, 주기적으로 관측한 채널 throughput을 함께 보낸다. 비디오 패킷의 중요도는 움직임 백터, 텍스처 필드, 시간계층화를 고려하여 GOP 내에서의 위치에 의해 결정되며, 이것을 이용하여 서브스트림을 정의한다. 서버는 수신단으로부터 온 응답 정보와 비디오의 통계적 특징을 사용하여 임의의 시점에서 전송하고자 하는 최적의 서브스트림을 결정한다. 이를 위해 스트리밍 시스템을 류잉 시스템으로 모델링하고, 각 서브.스트림에 있는 프레임의 복호화 실패을을 체감대역폭을 이용하여 계산하고 그 시점에 전송할 최적의 서브스트림을 선택한다. 수신단이 주기적으로 기록하고 전송한 채널정보에 대해, 송신단은 최적의 서브스트림을 새로이 계산하는데, 그때까지 서브스트링의 데이터는 Earliest Deadline First(EDP)방식으로 전송핀다. 이 때, 전송 순서는 원래의 재생 순서와 다르게 된다. 그리고, 실제 비디오 데이터를 사용한 실험에서, 제안한 스케줄링이 기존의 순차적인 전송보다 성능이 좋다는 것을 보여준다. We propose a packet scheduling algorithms for streaming media. We assume that the receiver periodically reports back the channel throughput. From the original video data, the importance level of a video packet is determined by its relative position within its group of pictures, taking into account the motion-texture discrimination and temporal scalability. Thus, we generate a number of nested substreams. Using feedback information from the receiver and statistical characteristics of the video, we model the streaming system as a queueing system, compute the run-time decoding failure probability of a Same in each substream based on effective bandwidth approach, and determine the optimum substream to be sent at that moment in time. Since the optimum substream is updated periodically, the resulting sending order is different from the original playback order. From experiments with real video data, we show that our proposed scheduling scheme outperforms the conventional sequential sending scheme.

디지털 멀티미디어 방송(DMB)에서 클라이언트 요구 기반의 데이터 캐러셀 스케줄링

최수정,박익현,강상혁,Choi, Sujeong,Park, Ik-Hyun,Kang, Sang-Hyuk 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.2B

이 논문에서는 DMB에서의 주문형 데이터 방송을 위한 새로운 데이터 캐러셀 스케줄링 알고리듬을 제안한다. 클라이언트로부터 리궤스트를 받으면 서버는 그 리궤스트에 대한 통계치를 이용하여 아이템을 두 집합으로 나눈다. hot 아이템을 한 캐러셀 내에서 여러 번 반복하여 방송하도록 하여 그 아이템에 대한 클라이언트의 대기시간을 줄이도록 하였으며, hot 아이템의 방송회수에 상한선을 두어 cold 아이템의 방송 기회를 늘이도록 하여 클라이언트의 리퀘스트에 대한 응답 성공률을 높이도록 하였다. 모의실험을 통해 캐러셀 기반의 다른 알고리듬과 비교하였을 때 원하는 결과를 얻어낼 수 있었다. We propose a new data carousel scheduling algorithm for on-demand data broadcasting in DMB. The server divides data items into two sets named hot and cold, according to request statistics from clients. When constructing a data carousel, hot items are placed periodically with their upper limit of broadcasting frequency. If there are empty slots after placing hot items, cold items with high request ratio are placed until the carousel is full. A cold item is broadcast only once in the caroulsel. For the response on clients' requests, our proposed scheme is shown to have high success ratio with short waiting time.

온라인 시장 활성화를 위한 간편결제 특성에 관한 연구

최수정,김창식,곽기영,김희웅,Choi, Sujung,Kim, Changsik,Kwahk, Keeyoung,Kim, Heewoong 디지털산업정보학회 2016 디지털산업정보학회논문지 Vol.12 No.3

This study develops an extended model to predict customer satisfaction in easy payment systems based on information systems success model. Our data was collected from easy payment systems users and analyzed using PLS. This study selected four variables as easy payment systems characteristics(convenience, variety, security, speed) along with gender being used as a moderating variable. The results showed that convenience and security are turned out to affect customer satisfaction. Additionally, the test of difference in gender revealed that with respect to gender, moderating effects exist in security and speed. This implies that this study can provide different promotion strategies according to gender. Overall, the proposed model could be used to predict customers' willingness to pay on the easy payment systems.

이러닝시스템의 매체풍부성, 매체유용성, 매체경험이 학습자 만족에 미치는 영향

최수정,강경준,고일상,Choi, Su-Jeong,Kang, Kyung-Jun,Ko, Il-Sang 한국데이터전략학회 2007 Journal of information technology applications & m Vol.14 No.2

In an effort to apply IT to practices of learning, universities are trying to implement e-Learning systems and expanding the extent of their usage. Nowadays, e-Learning systems are not only used for conducting web-based distance learning, but also used for supporting traditional classes education by encouraging communication and information sharing between instructors and learners or among the learners. There is relatively lack of studies on the exploitation of e-Learning systems in the traditional classes, in comparison with a distance education. Specifically, howe-Learning systems could support the traditional class and/or which benefits e-Learning systems could offer in the classes are among the important issues. In this study, we suggest that e-Learning systems would be the rich media to communicate and exchange information among people who participate in a class. We derive key variables like media richness and media experience from Media Richness Theory and from Channel Expansion Theory. Moreover, Media usefulness and Satisfaction of a learner with e-Learning system is drawn from the literature on IS success. We examine the effects of perceived media richness, media usefulness, and media experience on leaner's satisfaction with e-Learning systems. In addition, we also investigate learner's media usefulness perception which is positively related to media richness and media experience. Finally, learner's experience with e-Learning systems affects perceived media richness. Based on the results of an empirical test. we first suggest that perceived media richness with e-Learning systems contributes to increase media usefulness and satisfaction of a learner. Second, media experience is an important predictor of media richness and media usefulness perception. Consequently, the result can support Channel Expansion Theory. Finally, media usefulness perception affects learner's satisfaction with e-Learning systems.

NaNO₃, NaHCO₃ 농도가 Arthrospira platensis 생장에 미치는 영향

최수정,하종명,이재화,Choi, Soo-Jeong,Ha, Jong-Myung,Lee, Jae-Hwa 한국생물공학회 2015 KSBB Journal Vol.30 No.6

Arthrospira platensis (A. platensis) is one of the most explored cyanobacteria and has been studied for proteins, vitamins, pigment (chlorophyll and carotenoids) and fatty acid. In this study, we tested the effect of $NaHCO_3$ and $NaNO_3$ on the microalgae growth under photoautothrophic culture in A. platensis. As a result, cell growth and dry cell weight were increased in proportion to the $NaHCO_3$ and $NaNO_3$ concentration. Pigment (chlorophyll and carotenoids) contents of A. platensis were increased with proportion to $NaHCO_3$ concentration. But, the content of pigment (chlorophyll and carotenoids) in 100% $NaNO_3$ medium of A. platensis was the highest, 40%, 140% and 200% $NaNO_3$ medium with pigment content of A. platensis was reduced. In conditions of $NaHCO_3$ (50%) or $NaNO_3$ (40%) limitation, A. platensis could accumulate lipids to high as 1.7-fold and 1.3-fold.

만성불면증 환자에게 적용한 단기 인지행동중재의 효과

최수정,이영희,Choi, Su-Jung,Yi, Young-Hee 한국중환자간호학회 2008 중환자간호학회지 Vol.1 No.1

Purpose: This study was conducted to exam the effects of the Abbreviated Cognitive Behavioral Therapy(ACBT) on chronic insomnia. Methods: Study was one-group interrupted time series study that involved 13 adults(mean age=51.7, aged 25-77 years) with chronic primary insomnia who visited sleep disorder clinic of S Hospital from November 2004 to October 2005. The subjects received 2-session individual ACBT with 2 week-interval($1^{st}$: 1.5- 2hrs, $2^{nd}$: 20-30min). To measure the subjective insomnia severity and sleep patterns, 3 times of insomnia severity index and sleep logs were completed(before ACBT, after ACBT, and 3-month after ACBT). The main outcomes were subjective insomnia severity and sleep patterns(sleep onset latency, waking after sleep onset, and total sleep time, sleep efficiency). The data were analyzed with SPSS 10.0 version program by Friedman test, Wilcoxon signed rank test with Bonferroni correction. Results: There were statistically significant decrease in insomnia severity index, sleep onset latency, and waking after sleep onset, and increase total sleep time and sleep efficiency. Conclusion: ACBT was effective in reducing subjective insomnia severity and improving sleep patterns. Sleep improvement was better sustained over time with ACBT.

스마트 관광 시대에 국내 도보여행을 위한 안전정보 프레임워크 개발 및 적용

최수정 ( Choi Su-jeong ),함주연 ( Ham Ju-yeon ),구철모 ( Koo Chul-mo ) 한국정보시스템학회 2017 情報시스템硏究 Vol.26 No.3

Purpose This study aims to propose a framework for safety in domestic walking tourism, which defines the scope and type of safety information for tourists. Also, the framework provides a systematic classification for safety information in walking tourism. As the importance of safety in walking tourism due to the frequent occurrence of crimes and unexpected accidents increases, it is necessary to provide tourists with safety information on walking courses rapidly and systematically. However, most administrators (e.g., local governments) have mainly focused on providing tour information on walking courses through Internet websites or mobile apps, overlooking the safety issue. Besides, there is a lack of understanding of safety not only in walking tourism but also in the whole tourism industry. Design/methodology/approach This study proposes the framework that covers all possible safety-related information in walking tourism. Furthermore, to validate its availability, this study analyzes eight major platforms which offer tour information to tourists by applying the framework. Findings The major findings of this study are as follows. First, all platforms considered in this study do not provide any information on tourism safety, focusing on the provision of tour information. Second, three platforms currently provide an SOS function which means post-safety information. That is, no safety information is provided to prevent safety issues in advance. Finally, despite the increase of social concerns, all platforms do not provide safety information on public order and diseases in the social disaster classification as well as environmental pollution in the natural disaster classification. The details and implications of the findings are presented.

프로농구 관람자의 타이틀 스폰서 인지도, 기업이미지가 구매의도에 미치는 영향

최수정(Choi, Su-Chung),김선주(Kim, Sun-Ju),이상일(Lee, Sang-Il) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.2

The survey with direct spectators was done in Seoul Jamsil Students’ Gymnasium and Seoul Jamsil Gymnasium, and the survey with indirect spectators was done in tow colleges and two basketball clubs in Seoul and Gyeong-gi area. The selected subjects for the survey was 421 in total. The collected data was analyze in frequency, factor, reliability, correlation and multiple regression analysis using SPSS(ver. 18.0). The result acquired from the above study method is as follows. The purchase intention was affected significantly by the title sponsor awareness and the corporate image. In conclusion, the result that the awareness and the corporate image affect the purchase intention means that companies should recognize the importance of the title sponsor awareness and the corporate image rightly, perform the proper marketing accordingly and carry on the continuous effort on promotion methods.

경제민주화 실현을 위한 하도급거래에서의 법적 과제 - 국회 정무위원회안을 중심으로 -

최수정 ( Soo Jung Choi ) 한국경제법학회 2013 경제법연구 Vol.12 No.1

정부의 ‘경제민주화 1호’ 법안으로 하도급법이 2013년 4월 국회 본회의를 통과하였다. 그 내용을 살펴보면 징벌적 손해배상제도의 확대, 중소기업협동조합에의 납품단가 협의조정권 및 분쟁 조정신청권 부여 등이 있다. 중소기업 경영난의 핵심요인으로 지적된 ‘경제3不’ 문제 중 불공정한 하도급거래가 매우 중요하게 다루어질 만큼 불공정한 하도급관행은 중소기업이 직면한 가장 큰 어려움 중 하나였다. 징벌적 손해배상제도가 찬반논쟁을 거쳐 이미 도입된 이상 이에 대한 입법적 보완을 통하여 사적 구제제도를 활성화시키는 것이 중요하다고 본다. 현행 하도급법 제35조 제2항에 의하면 원사업자가 고의 및 과실이 없음을 증명해야 한다. 고의 또는 중과실을 요건으로 하는 외국의 징벌적 손해배상요건과 비교할 때 원사업자에게 그 부담이 매우 크며, 특히 현행법상 대기업뿐만 아니라 중견기업 또는 중소기업도 원사업자로서 징벌적 손해배상책임의 주체가 될 수 있으므로 그 요건을 고의 또는 중과실로 가중하는 것이 입법론적으로 바람직하다고 판단되며, 징벌적 손해배상책임의 주체도 일정한 자산규모 이상의 대기업 또는 공정거래법상의 시장지배적사업자에 해당하는 하도급거래시장에서의 지배력이 인정될 수 있는 자로 한정되는 것이 바람직하다고 판단된다. 우리나라 하도급법은 사후적 구제에 중점이 맞추어져 있는데 사후적 교정보다는 사전예방적 규제방법이 장기적으로는 효과적이라고 할 수 있다. 비구속적 자율규제가 더 효과적일 수 있으며, 수급사업자 스스로 법률적 대응력을 가질 수 있도록 법률지원시스템과 법률교육을 지속적으로 제공하는 것도 중요하다. 하도급거래관계에서 힘의 불균형을 발생시키는 주된 원인이 정보의 비대칭성에 있으므로 이를 보완하기 위하여 일정한 규모 또는 시장지배력을 가진 원사업자의 경우 하도급거래의 기본정보를 공개하게 하는 공시제도도 사전적 예방책으로 고려해볼 수 있다. This article reviews the key issues of Fair Transaction in Subcontracting Act (hereinafter “FTSA”). Recently there have been keen interests in democratic democratization in Korea, which led to many bills pending at the National Assembly. Finally this year the National Assembly passed the amendment to the FTSA, which is considered a key economic democratization act. Under the current FTSA, liability for punitive damages of up to 3 times actual damages can be imposed only for misappropriation of technical data (Article 12-3(3) of the FTSA). In order to tackle unfair subcontracting practices and protect SME(small-medium enterprises), the Amendment expands the scope of the punitive damages provision to (i) unreasonable determination of subcontracting prices, (ii) unreasonable cancellation of entrustment, (iii) unreasonable return of goods, and (iv) reduction of subcontracting prices. Since the FTSA only provided the right of the Korea Federation of SME (the “Federation”) “to request an adjustment” of subcontracting prices (Article 16-2(2)), the subcontractor should conduct negotiations with the principal contractor directly. The Amendment provide the Federation with the power to negotiate on behalf of member subcontractors with their principal contractors for adjustment of supply prices, and if negotiations fail, the Federation may apply for mediation through the Subcontract Dispute Mediation Council as well(Articles 16-2(2) through (8), 24-4(1)). As such, this article explored the key issues of the Amendment. The conclusion is that the punitive damage provision should be applied only to the prime contractor with dominant market power. Furthermore, the disclosure of essential information of the subcontract transaction and the legal education for the subcontractor must be provided.

평창 패럴림픽 정보서비스 수용도가 지체장애인의 동계스포츠 직 · 간접적 참여의도에 미치는 영향

최수정(Choi, Soo-Jeong),이현수(Lee, Hyun-Su) 한국체육과학회 2018 한국체육과학회지 Vol.27 No.6

The purpose of this study is to identify the impact of the acceptance of information services at the Pyeongchang Paralympics on the intention of participating in winter sports directly and indirectly, and to increase the participation rate of winter sports for the disabled. The study conducted a survey of 217 people with disabilities living in P city and participating in daily sports using a revised and supplementary questionnaire for the purpose of the study. Data processing conducted an exploratory factorial analysis using the SPSS 23.0 program and used the AMOS 23.0 program to validate the confirmed factor analysis and structural equation model. His results are as follows. First, focusing on the measurement model, discriminating against each other, confirmed factors analysis shows that information service of disabled people is acceptable, winter sports directly participating, and indirect participation in winter sports Based on these findings, information service for the Paralympics should be actively received to increase the participation rate of the disabled directly and indirectly in winter sports. Further, further research requires greater interest and participation in sports for the disabled as well as the Paralympics and various sports for the disabled, and more sustained and active motivation, information and indirect experience for the disabled Be fed.