Lymphoscintigraphy에 이용되는 방사성의약품의 사용제한으로 인한 대체 방사성의약품의 성능평가

서영덕,정재훈,문종운,윤상혁,김영석,강세훈,원우재,김석기 대한핵의학기술학회 2008 핵의학 기술 Vol.12 No.4

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.

스마트 온실을 위한 온톨로지 지식저장소 설계 및 시뮬레이션

서영덕,김영갑,이의종,설광수,백두권 한국시뮬레이션학회 2017 한국시뮬레이션학회 학술대회집 Vol.2017 No.-

최근 제 4차 산업혁명의 등장으로 ICT기술과 다양한 기술들 간의 융합이 활발히 이루 어지고 있다. 그중에서 사물인터넷과 농업이 결합한 스마트 농업이 발전하고 있다. 스마트 온실은 스마트 농업의 한 분야로;스마트 온실 시스템을 구현하기 위해서는 온도;공기;빛;물;토양 등의 환경요소 인자들의 상황정보를 이용하여 자동적으로 작물의 생장에 필요한 기능을 제공해야 한다. 하지만;이러한 환경적 요소들은 인위적으로 조절하기 힘들기 때문에 환경의 변화에 맞는 적합한 전략의 수립이 필요 하다. 본 논문에서는 온실의 환경요소와 온실 내의 제어장치들을 자동적으로 제어할 수 있는 전략들을 ISO/IEC-11179 기반 온톨로지 지식저 장에 저장하고;이를 바탕으로 MAPE-K 모델 기반의 스마트 온실 시스템을 시뮬레이션 하여 검증하고자 한다.

Enhancement of rate performance in lithium-ion battery by C4F8 plasma treatment on PCNF/GPCNF anode

서영덕,이충현,장정식 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0

Carbon-fluorine (CmFn) functional groups are introduced on the surface of platelet carbon nanofiber (PCNF) and graphitized platelet carbon nanofiber (GPCNF) for enhanced rate performance of lithium-ion battery (LIB) anodes. The CmFn functional groups are selectively introduced via controlled plasma treatment in vacuo with C4F8 gas. Combined XPS, FT-IR and TOF-SIMS analyses demonstrate that the CmFn functional groups had mainly semi-ionic C-F bonds. PCNF treated with the plasma exhibits the largest discharge capacity of 387 mAh/g with increased first-cycle coulombic efficiency and discharge capacity of 293 mAh/g at the 10C rate, which are 1.13- and 1.63-fold higher values, respectively, than those of pristine PCNF.

인터넷 GIS의 사용 분석

서영덕,안경환,홍봉희 한국정보과학회 데이터베이스 소사이어티 2002 데이타베이스 연구 Vol.18 No.1

Increased rate performance of natural/synthetic graphite anode in lithium-ion battery via C4F8 plasma treatment

서영덕,이경섭,장정식 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0

A novel method of introducing highly electronegative fluorine elements on carbon surfaces was conducted on the commercialized natural and synthetic graphites for enhanced performance of lithium ion battery anodes. The surfaces of graphites were modified with carbon-fluorine (C-F) groups via C4F8 vacuum plasma treatment. The characteristics of C-F bonding (ionic, covalent and semi-ionic) on the graphite surface was determined by XRD, Raman, EA and XPS. The introduced semiionic C-F groups reduced the resistance related to lithium ion migration and charge transfer, leading to vast increase of discharge capacity without deteriorating the 1st cycle coulombic efficiency at high 10C rate.

영화산업과 수직결합 - 이중마진 분석을 중심으로 -

서영덕 한국국제문화교류학회 2015 문화교류와 다문화교육 Vol.4 No.1