Fabrication of metal organic framework / partially reduced graphene oxide composite with enhanced water stability

서영덕,장정식 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1

Recently, there have been various attempts to increase the stability of metal organic framework (MOF). In this study, the MOF covered with partially reduced graphene oxide (PRGO) was fabricated by layer-by-layer method. To measure the stability of MOF/PRGO composite, the composite was heated up for 24 h and collapsed structure was measured by BET analysis. Structural and thermal properties were also characterized by SEM, XRD, TGA, FT-IR. Overall results indicate that PRGO sheet interacted with the surface of MOF and enhanced water stability was obtained by combination of PRGO sheet and MOF.

음원시장의 가격전략 유형 비교: 정액제와 종량제

서영덕 한국문화경제학회 2013 문화경제연구 Vol.16 No.3

최근(2013년)에 음원 가격의 현실화에 대한 요구와 무제한 정액제에 대한 비판 등 음원의 가격제에 대하여 관심이 높아지고 있다. 본 연구는 이러한 현실적 관심에 맞추어 음원시장의 대표적인 가격전략 유형인 정액제와 종량제를 간단한 수리모형으로 접근하여 비교하고 있다. 분석의 편의를 위하여, 음원을 소비자에게 판매하는 온라인 음원유통자가 독점임을 가정하고 있으며, 음원의 가격은 독점인 음원유통자가 결정을 하고 수입을 음원창작자와 (외생적으로 주어진) 일정 분배요율로 배분하는 시스템을 고려하고 있다. 또한 각 소비자의 예산제약은 존재하지 않으며, 소비자가 음원을 소비하기 위해 추가적인 네트워크 사용료는 지불하지 않는 것으로 가정하고 있다. 음원시장의 가격전략 유형은 가격차별 종량제, 단일가격 종량제, (무제한) 정액제 3가지 시스템으로 구분하여 분석하였는데, 주요 연구결과는 다음과 같다. 단기적 관점에서 음원유통자의 이윤에는 정액제가 (단일가격) 종량제보다 유리하지만, 장기적 관점에서 음악산업의 품질 및 다양성을 위해서는 정액제보다는 종량제가 더 바람직하다. 왜냐하면 정액제 시스템 아래에서는 음원의 품질과 상관없이 음원창작자의 수입이 동일하므로 더 좋은 음악을 창작하기 위한 노력을 하지 않으려 할 것이기 때문이다.

안근마비 없이 두통으로만 나타난 내직근 안와근염

서영덕,이준호,박강민 대한신경과학회 2022 대한신경과학회지 Vol.40 No.2

웹 환경에서의 개인정보 검색기법

서영덕,장재영 한국인터넷방송통신학회 2015 한국인터넷방송통신학회 논문지 Vol.15 No.4

최근 개인정보 보호에 대한 관심이 높아지면서 웹 환경에 노출된 개인정보를 효율적으로 검색할 수 있는 시스템의 필요성이 증대되었다. 현재 웹 환경에 노출된 개인정보는 자신이 알고 있는 단편적인 단서를 이용한 검색을 통해 노출여부를 판단하고 있다. 그러나 이 방법은 검색결과의 우선순위가 개인정보의 노출도와 관계가 없어 효율적 이지 못하다. 본 논문에서는 사용자 입력을 근거로 웹 환경에 노출된 사용자의 개인정보를 효율적으로 검색하고 삭제 할 수 있도록 지원하는 프로세스를 제안한다. 또한 기존 검색 방법과의 비교를 통하여 검색성능의 향상 정도를 평가 한다. Since we use internet every day, the internet privacy has become important. We need to find out what kinds of personal information is exposed to the internet and to eliminate the exposed information. However, it is not efficient to search the personal information using only fragmentary clues in web search engines because the ranking results are not relevant to the exposure degree of personal information. In this paper, we introduced a personal information retrieval system and proposed a process to remove private data from the web easily. We also compared our proposed method with previous methods by evaluating the search performance.

Contracts between a Content Provider and Asymmetric Broadcasters: “Burn‐boats” or “Build‐boats” Strategy

서영덕 한국문화경제학회 2011 문화경제연구 Vol.14 No.2

This paper provides a theoretical analysis of the contract between a content provider and two asymmetric broadcasters. We adopt a two‐stage dynamic game model and investigate a subgame perfect Nash equilibrium through backward induction. The main implication is that a monopolistic content provider should contract exclusively with the inferior broadcaster (whose own program or best alternative available has the lower audience rating) rather than the superior broadcaster (whose own program or best alternative available has the higher audience rating). However, its strategy of setting the broadcasting fee varies according to the popularity of its content. When the content is quite popular, the provider should adopt a “build‐boats” strategy and threaten the inferior broadcaster with a potential exclusive contract with the superior broadcaster (by maintaining the chance to contract with the latter). When the content is not popular enough, it should adopt a “burn‐boats” strategy and convince the inferior broadcaster of its exclusive contract (by abandoning the chance to contract with the superior broadcaster).

Molecular Nano Analysis in Ambient Condition

서영덕,김희영 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1

Today’s emerging nano technology based on molecular device and biology demands appropriatetools for chemically investigating a specific part with nanometer scale spatial resolution in ambient condition. Electron microscopy fits very well in the spatial resolution aspect, but they hardly provide any molecular information and strictly require a high vacuum condition. Scanning Probe Microscopy, such as STM and AFM, also provides nanometer scale spatial resolution but only with very limited molecular information due to their inherent imaging mechanism: tunneling and force interaction between molecule and tip. Laser spectroscopic information in nanometer scale would be most desirable because of its inherent capability to give a wealth of information on the chemical bonding and functional groups. Since the diffraction limit does not allow us to focus light to dimensions smallerthan roughly half a wavelength, traditionally it was not possible to interact selectively with nanoscale features. In this talk, recent effort and development in molecular nano analysis in ambient condition to overcome the diffraction limit by combining AFM with confocal Raman, fluorescence, and infrared absorption spectroscopy will be presented.

이동체 데이터베이스를 위한 디클러스터링 정책

서영덕,홍은석,홍봉희,Seo YoungDuk,Hong EnSuk,Hong BongHee 한국정보처리학회 2004 정보처리학회논문지D Vol.11 No.7

Because there are so many spatio-temporal data in Moving Object Databases, a single disk system can not gain the fast response time and tota throughput. So it is needed to take a parallel processing system for the high effectiveness query process. In these existing parallel process-ing system. it does not consider characters of moving object data. Moving object data have to be thought about continuous report to the Moving Object Databases. So it is necessary think about the new Declustering System for the high performance system. In this paper, we propose the new Dechustering Policies of Moving objet data for high effectiveness query processing. At first, consider a spatial part of MBB(Minimum Bounding Box) then take a SD(SemiAllocation Disk) value. Second time, consider a SD value and time value which is node made at together as SDT-Proximity. And for more accuracy Declustering effect, consider a Load Balancing. Evaluation shows performance improvement of aver-age %15\%$ compare with Round-Robin method about $5\%\;and\;10\%$ query area. And performance improvement of average $6\%$ compare with Spatial Proximity method.

Vertical Product Differentiation: Movie and Game Industry

서영덕 한국문화경제학회 2012 문화경제연구 Vol.15 No.2

This paper provides a highly generalized model of vertical differentiation considering consumers’ time costs.We will investigate how consumers’ time costs affect a monopolist’s product differentiation and prices in the movie/game industry. It is important to consider consumers’ time costs because consuming cultural goods such as movies and online games needs time a lot. It is shown that in the game industry, the consumers’ time cost reduces the demand for a game without game items and raises the demand for a game with game items. In the movie industry, on the other hand, it reduces the demand for a movie in theaters,while its effect on the demand for DVD/VOD is ambiguous. Interestingly, the demand for DVD/VOD can be also reduced if, for example, the density function of consumers’preference for quality decreases and the consumers feel DVD/VOD relatively more unattractive than a movie in theaters. In addition, in the movie industry, the consumers’ time cost reduces the prices of both DVD/VOD and a movie in theaters.In the game industry, on the other hand, it reduces the price a game without game items, while its effect on the price of a game with game items is ambiguous. Interestingly, the price of a game with game items can increase if,for example, the density function of consumers’ preference for quality decreases and the game items save consumers’ time a lot. This paperassumed that the quality of two products is exogenously given. Producers,however, can also decide the quality endogenously for profit maximization. The paper did not analyze how to decide the optimal qualities. We remain thisanalysis open. In addition,additional researches should be done on what happens under duopoly or competition,and on what happened in the real cases.

4차 산업혁명, 지능, 예술

서영덕 한국문화예술경영학회 2017 한국문화예술경영학회 학술대회 Vol.2017 No.05

악성 뇌부종의 치료 중 고삼투질성 고혈당으로 발생한 눈된떨림

서영덕,박성호 대한신경과학회 2020 대한신경과학회지 Vol.38 No.4

Ocular flutter (OF) is a rare eye movement disorder with horizontal saccadic oscillations without inter-saccadic intervals. The OF can occur in various clinical settings. A 83-year-old female showed the OF in hyperosmolar hyperglycemic state (HHS) following malignant cerebral infarction. The pathophysiology of the OF is still unclear, but this case provides a new information that the OF can occur in the context of toxic-metabolic state such as HHS.