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.

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.

Selective Electro – Thermal Growth of Zinc Oxide Nanowire on Photolithographically Patterned Electrode for Microsensor Applications

서영덕,고승환,홍석준,김근호,황광일,최준호,홍원화,여준엽 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.3 No.2

Hydrothermal growth of zinc oxide (ZnO) nanowire (NW) enables a facile synthesis of versatile 1D nanostructure, but the conventional bulk heating procedure is assessed to be unsuitable for microsensor application in terms of selectivity and power consumption. In this study, we introduce selective electro-thermal growth of ZnO NW on photolithographically patterned electrode in the liquid environment. By applying constant current to the targeted electrode, densely packed ZnO NWs are successfully synthesized only at the desired electrode with very small power consumption. It is also confirmed that the electro - thermally grown ZnO NW network connecting two distinct electrode can be utilized as photosensitive channel, proving that this process as well as the resultant ZnO NW has a high potential for microsensor applications.

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.

Lymphoscintigraphy에 이용되는 방사성의약품의 사용제한으로 인한 대체 방사성의약품의 성능평가

서영덕,정재훈,문종운,윤상혁,김영석,강세훈,원우재,김석기,Seo, Young-Deok,Jeong, Jae-Hun,Moon, Jong-Woon,Yun, Sang-Hyeok,Kim, Yeong-Seok,Kang, Se-Hun,Won, Woo-Jae,Kim, Seok-Ki 대한핵의학기술학회 2009 핵의학 기술 Vol.13 No.1

Purpose: Several radioactive agents were used for lymphoscintigraphy in breast cancer. But recently, due to the change of local radiopharmaceutical licensing policy and discontinuation of supplies from manufacturer, we could not use many radiocolloids such as $^{99m}Tc$-Antimony Trisulfide Colloid, $^{99m}Tc$-Tin Colloid, $^{99m}Tc$-Human Serum Albumin. So it is necessary to use the substitution radiopharmaceutical. Therefore, this study aims to evaluate the performance of substitution radiopharmaceutical ($^{99m}Tc$-Phytate) including the existing radiocolloids and to set up of the appropriate protocol in lymphoscintigraphy. Materials and Methods: For each radiocolloids ($^{99m}Tc$-Antimony Trisulfide Colloid (ASC), $^{99m}Tc$-Tin Colloid (TC), $^{99m}Tc$-Human Serum Albumin (HSA), $^{99m}Tc$-Phytate) were performed the particle size by Zeta Sizer (Nano-ZS) and we compared the radiolabeling time, procedure and acquisition time for each of the radiocolloids (total 200 patients). For the last time, we made an analysis of image for each of the radiocolloids with our previous report (SJ Jang et al, Korean Nucl Med Mol imaging Vol.41, No.6, Dec 2007). Results: The particle size of each radiocolloids showed A.S.C (50 nm), T.C (310 nm), H.S.A (10.8 nm), $^{99m}Tc$-Phytate (499 nm). The labeling and acquisition time for each of the radiocolloids showed no substantial difference. But there is difference of the labeling time for the A.S.C. because the ASC procedure need to boiling process. There were no significant differences among those radiocolloids (p>0.005) in the identification rate (IR), false negative rate (FNR), and negative predictive value (NPV). Conclusions: $^{99m}Tc$-labeled radiocolloids showed equivalent results in lymphoscintigraphy. Therefore, in this exam of each radiocolloids could be applied appropriate protocol in lymphoscintigraphy.

46차 대한핵의학회 추계학술대회 포스터 : 유방암환자에서 수술전 18F-FDG PET/CT의 역할

서영덕,김성민,김근호,장일성,김혜경,노흥규 대한핵의학회 2007 핵의학 분자영상 Vol.41 No.5

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).

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.

영화산업의 수익성과 다양성 제고를 위한 가격차별전략

서영덕 한국문화경제학회 2007 문화경제연구 Vol.10 No.2

Although price discrimination strategy is normal and usual in general goods such as computers, mp3 players, and so on, movie theaters have adopted a uniform prices for differentiated movies. This phenomenon being regarded as “puzzling”, some researches try to solve the phenomenon with ‘positive perspective’ while others propose strategic price discrimination with ‘normative perspective’. This paper shows that price discrimination for differentiated movies can improve both profitability and diversity in the movie industry. It assumes a monopolistic movie theater and two types of movies: the highly-popular one and the normally-popular one. If the movie theater sets high price for the highly-popular movie and low price for the normally-popular one instead of unit price, the profit of the theater increase and the equity of screen sharing improves. However, these results do not hold in the case the theater and viewers can not know anything about the equality of movies in advance or in the case the negative ‘signaling effect’ of price on the equality of movies dominates. 상품의 품질이 다르면 상품의 가격도 다른 것이 일반적이다. 하지만 영화의 경우에 품질, 제작비용, 감독, 주요 배우, 장르 등과 상관없이 관람료가 동일하다. 이러한 현상은 다른 연구에서 ‘단일입장료 설정 퍼즐’이라고 불리고 있는데, 몇몇 연구는 실증적 관점(positive perspective)에서 출발하여 이 퍼즐에 대한 해답을 제시해 주고 있는 반면, 다른 몇몇 연구는 규범적 관점(normative perspective)에서 출발하여 가격차별화를 시도해야 한다고 주장하고 있다. 본 논문은 후자의 연구에 해당하는데, 독점상영관이 많은 관람객을 유인할 수 있는 영화와 그렇지 못한 영화를 구분하여 가격차별을 적용함으로써 단일관람료를 적용할 경우에 비해 영화산업의 수익성과 영화상영의 다양성을 더 높일 수 있음을 수리적 모형을 이용하여 분석하고 있다. 구체적으로, 블록버스터 영화처럼 많은 관람객을 유인할 수 있는 영화는 높은 관럄료를 설정하고 예술 또는 독립영화처럼 그렇지 못한 영화는 낮은 관람료를 설정하고 예술 또는 독립영화처럼 그렇지 못한 영화는 낮은 관럄료를 설정하게 되면, 단일관람료를 설정하는 경우에 비해 두 종류의 영화 모두에서 이윤이 높아지고 어느 한 종류의 영화가 스크린의 대부분을 차지하는 문제도 극복할 수 있게 된다. 다만 이러한 결과가 성립하지 않을 수도 있는데, 상영관과 관람객이 영화의 품질에 대해서 전혀 알 수 없는 경우와 관람료의 ‘신호효과’가 부정적인 방향으로 크게 작용할 경우이다.

영화산업과 수직결합 - 이중마진 분석을 중심으로 -

서영덕 한국국제문화교류학회 2015 문화교류와 다문화교육 Vol.4 No.1

수직결합(vertical integration)이란 수직통합 혹은 수직계열화라고도 하는데, 가치 사슬로 연결된 다수의 생산활동 과정이 각각 독립된 기업에 의해 이루어지다가 하나의 기업으로 결합 혹은 통합되어 이루어지는 것을 말한다. 경제학에서 전통적으로 수학적 으로 증명하고 있는 수직결합의 가장 큰 장점은 이중마진(double marginalization)의 문제를 해결함으로써 효율성을 달성한다는 것이다. 본 연구는 전통적으로 인정해왔던 수직결합에 의한 효율성 달성 논리를 영화산업에 적용할 수 없음을 수학적으로 제시하고 있다. 구체적으로, 이중마진의 문제는 상류와 하 류에 해당하는 독립된 두 기업이 각각 가격을 결정하기 때문에 발생하고 수직결합을 하 게 되면 그 문제가 없어진다는 것이다. 하지만 영화산업의 경우 상류에 해당하는 제작과 하류에 해당하는 상영 사이의 거래가 각각의 독립된 가격에 의해 이루어지는 것이 아니 라 고정된 수익 배분 비율에 의해 결정되는데, 이처럼 수익을 배분하는 구조가 되면 독 립된 기업 간의 거래일지라도 이중마진의 문제는 심각하지 않아 수직결합을 하더라도 장점은 크지 않다.