디지털 홈 서비스를 위한 리눅스 환경의 IEEE1394 기반 미디어 스트리밍

이성용,이재길,최창열,Lee Sung Yong,Lee Jae Gil,Choi Chang Yeol 한국통신학회 2004 韓國通信學會論文誌 Vol.29 No.10B

최근 들어 디지털 홈 서비스와 요소 기술에 대한 관심이 급증하고 있다. 디지털 흠에서 홈 네트워크에 연결된 디지털 기기간의 멀티미디어데이터 송수신 기능은 필수적이다. 본 논문은 리눅스 환경에서 IEEE1394를 통한 멀티 미디어 스트리밍 시스템의 설계와 구현에 대해 기술한다. 개발된 시스템의 주요 특징은 다음과 같다. 첫째, IEEE1394를 통해 DV뿐 아니라 MPEG2-75 형식의 데이터 송수신이 가능하다. 둘째, 디바이스 드라이버를 이용하여 IEEE1394, IEC61883 프로토콜을 투명하게 처리함으로써 데이터 송수신 프로그램 개발의 복잡성을 줄였다. 셋째, 흔히 사용하는 PC의 서로 다른 사양을 고려한 용량적응기법을 적용하여 DV 데이터 뿐 아니라 HD급 데이터까지 유연하게 스트리밍 할 수 있다. 이러한 기능과 특징들을 IEEE1394 기반의 흠 네트워크 테스트베드를 구축하여 시험, 검증하였다. 본 논문에서 제시된 미디어 스트리밍 기법은 리눅스 환경에서 흠 미디어 서버뿐 아니라 IEEE1394를 통한 미디어 스트리밍 기술로 충분히 활용될 수 있다. Recently the interest in digital home services and its related technology has increased rapidly. Multimedia data transmission between digital devices that are connected to home network is essential function. This paper presents the design and implementation of multimedia streaming system based on IEEE1394 in Linux environment. The key features of proposed system are as follows. First, it can transmit and receive not only DV format data but also MPEG2-TS format data through IEEE1394 bus. Second, it uses device drivers that handling IEEE1394 and IEC61883 protocol transparently to reduce the complexity of communication program. Third, it applied capacity adaptation technique considering various specifications of PCs to get smooth streaming for HD data. These characteristics are tested on testbed of IEEE1394 based home network. The proposed media streaming technique can be used as a home media sever in Linux environment.

연속체의 이산화에 의한 등가트러스모델 개발

이성용,김태곤,이정재,Lee, Sung-Yong,Kim, Tae-Gon,Lee, Jeong-Jae 한국농공학회 2009 한국농공학회논문집 Vol.51 No.3

Generally, structures are analyzed as continuum. However, sometimes it is more efficient to analyze structure as a discrete model rather than as a continuum model in case of the structure has complex shape or loading condition. This study, therefore, suggests an improved analysis discrete model, named Equivalent Truss Model (further as "ETM"), which can obtain similar results with analyzing continuums analysis. ETM adopts a lattice truss to compose the members of the model, and analyses the structures. As a consequence, the ETM produced the identical outcome with the continuums analysis in section force of different structures and loading conditions. Similar results have been shown in internal stress analysis as well. Make use of that ETM is discrete, fractural path of beam was analyzed by ETM and the result was reasonable.

P2P 네트워크에서 멀티소스 스트리밍을 이용한 컨텐츠 분배

이성용,소양선,이재길,최창열,Lee, Sung-Yong,So, Yang-Seon,Lee, Jae-Gil,Choi, Chang-Yeol 한국정보처리학회 2004 정보처리학회논문지 A Vol.11 No.5

CDN(Contents Delivery Network)과 달리 P2P 네트워크에서는 컨텐츠를 제공하는 주체가 고정되어있지 않으므로 컨텐츠 분배는 매우 중요한 서비스이다. 그리고 P2P 미디어스트리밍에서 수신피어는 미디어 데이터를 재생함과 동시에 저장하고, 스트리밍이 끝나면 다른 피어에게 미디어 파일을 제공하는 새로운 소스피어로 동작한다 따라서 P2P 네트워크를 통해 컨텐츠를 분배하기 위해서는 미디어 스트리밍과 파일의 저장을 동시에 수행할 수 있어야한다. 본 논문은 기존의 컨텐츠 공유 모델이 미디어 데이터를 모두 다운로드 한 후에 재생을 하기 때문에 응답시간이 길고 P2P 멀티소스 미디어스트리밍에서 컨텐츠 분배가 어려운 점을 해결하여, 컨텐츠를 다운로드하면서 재생이 가능한 P2P 멀티소스 미디어스트리밍 시스템을 제안, 구현한다. 제안된 시스템에서는 수신피어가 데이터 스트리밍과 동시에 소스피어의 역할을 하므로 사용자 응답시간이 단축되고, 미디어스트리밍에 참여하는 소스피어의 수가 늘어나면 비트전송률이 증가되어 동시수요자 수도 증가된다. 또한, 피어가 가진 미디어파일의 일부분을 전송하는 메커니즘을 제공하여 컨텐츠 분배가 빨라진다 For a P2P network, the contents distribution is a very important service because the contents provider is not fixed. And in the P2P media streaming, a request peer replays and saves media data simultaneously, and after streaming it acts as a new source peer providing media files to other peers. Therefore streaming and file saying operations should be simultaneously carried out in order to distribute contents through the P2P network. In this paper, a P2P multi-source media streaming system which can replay the contents data during downloading is proposed and implemented. The system reduces the user response time and the number of simultaneous user increases more than two times. Moreover, transmitting a part of media file makes fast distribution and diffusion of contents possible.

한국의 경제위기와 출산력 변화

이성용,Lee, Sung-Yong 한국인구학회 2007 한국인구학 Vol.30 No.2

단일변이 탐색법과 유전 알고리즘에 의한 탱크모형 매개변수 결정 비교 연구

이성용,김태곤,이제명,이은정,강문성,박승우,이정재,Lee, Sung-Yong,Kim, Tae-Gon,Lee, Je-Myung,Lee, Eun-Jung,Kang, Moon-Seong,Park, Seung-Woo,Lee, Jeong-Jae 한국농공학회 2009 한국농공학회논문집 Vol.51 No.3

The objectives of this study are to apply univariate search and genetic algorithm to tank model, and compare the two optimization methods. Hydrologic data of Baran watershed during 1996 and 1997 were used for correction the tank model, and the data of 1999 to 2000 were used for validation. RMSE and R2 were used for the tank model's optimization. Genetic algorithm showed better result than univariate search. Genetic algorithm converges to general optima, and more population of potential solution made better result. Univariate search was easy to apply and simple but had a problem of convergence to local optima, and the problem was not solved although search the solution more minutely. Therefore, this study recommend genetic algorithm to optimize tank model rather than univariate search.

복염에 (複鹽) 의한 청도주물의 (靑銅鑄物) 탈린에 (脫燐) 관한 연구

이성용,황용길,최창옥 ( Sung Yong Lee,Yong Kil Whang,Chang Ok Choi ) 한국주조공학회 1984 한국주조공학회지 Vol.4 No.3

This study has been carried out to investigate into the dephosphorization by using fluxes containing Na₂CO₃-CaF₂-Na₂B₄O_7., l0H₂O and CaO-CaF₂-Na₂B₄O_7. 10H₂O system in molten bronze alloy. The dephosphorization degree of about 80% and 70% were obtained by Na₂CO₃-CaF₂-Na₂B₄O_7. 10H₂O and CaO-CaF₂-Na₂B₄O_7. 10H₂O system, respectively. When the contents of phosphorous in the molten bronze alloy were kept constant, although the amounts of fluxes exceed a given amount, it showed to give little effect in the degree of dephosphorization. The effects of dephosphorization in the molten bronze alloy was increased proportionally with increasing the contents of both phosphorous and amounts of fluxes. The slag formed from the Na₂CO₃-CaF₂-Na₂B₄O_7. 10H₂O system was found to be NaCaPO₄, Na₄P₂O_7 and NaF. The slag of CaO-CaF₂-Na₂B₄O_7. 10H₂O system was composed of Ca_5F (PO₄)3, CaO and CaF₂.

영문 : 국제사회 ; 한국 피임의 결정요인 분석에 대한 일 연구

이성용 ( Sung Yong Lee ),이정환 ( Jung Whan Lee ) 국제지역학회 2009 국제지역연구 Vol.13 No.3

The purposes of this study are followings. First, I will compare the effects of wive`s characteristics with the effects of the husbands` characteristics on the contraceptive use. Second, I will analyzed whether the determinants of the contraceptive use have changed according to parties. Third, I will analyzed whether the determinants of the contraceptive use at each parity have changed according to periods―especially, after and before economic crisis. According to expectation, the ratios using the contraception are affected by the wive`s and husband`s demographic characteristics, the determinants affecting the contraceptive use have changed by both parity and periods. The other findings are follows. First, women`s employment status have positive effects on the contraceptive use, regardless parties and periods. Second, the ideology emphasizing the relationship between parents and children, rather than the ideology emphasizing the relationship between husband and wife, is more like to affect the contraceptive use.

일반논문 : 독일경비업(獨逸警備業)의 법제(法制)

이성용 ( Sung Yong Lee ) 한국경찰법학회 2006 경찰법연구 Vol.4 No.1

In Deutschland ist der Begriff des Bewachungsgewerbes nicht gesetzliche geregelt. § 34 a Abs. 1 S. 1 GewO schreibt lediglich vor, dass derjenige, der gewerbsmaßig Leben oder Eigentum fremder Personen bewachen will (Bewachungsgewerbe), der Erlaubnis bedarf. Der Begriff der Bewachung wird aber gesetzlich nicht naher erlautert. Nach Rechtsprechung und Literatur ist Bewachung die auf den Schutz fremden Lebens oder Eigentums vor Gefahren fur die Sicherheit gerichtete Tatigkeit. Eine aktive Obhutstatigkeit ist unerlasslich fur den Begriff der Bewachung. Die das Bewachungsgewerbe betreffende zentrale Vorschrift ist § 34 a GewO. Er enthalt eine Legaldefinition des Begriffs des Bewachungsgewerbes und ist eine eine besondere Genehmigung vorschreibende gewerberechtliche Spezialvorschrift. Zudem ist der Bundesminister fur Wirtschaft und Arbeit nach § 34 a Abs. 2 GewO ermachtigt, mit Zustimmung des Bundesrates Vorschriften uber das Bewachungsgewerbe zu erlassen. Schließlich gibt es noch eine allgemeine Verwaltungsvorschrift zu § 34 a GewO und zur BewachV (BewachVwV). Eine entscheidende Neuerung der GewO vom 01.01.2003 liegt in der Einfuhrung von Satz 5 des § 34 a Abs. 1 GewO, der zum ersten Mal eine Sachkundeprufung fur drei bestimmte Wachtatigkeiten vorschreibt, namlich fur `Kontrollgange im offentlichen Bereich`, die `Tatigkeit als Ladendetektiv` sowie als `Tursteher vor Diskotheken`. Dieser Sachkundenachweis gilt nur fur diejenigen, die diese aufgezahlten Tatigkeiten konkret ausuben. Damit hat der Gesetzgeber eine Verstarkung des Rechtsguterschutzes der Auftraggeber bzw. der Adressaten der Bewachungstatigkeiten im Rahmen des subjektiven Rechts bezweckt. Weil hierdurch moglicherweise der Gleichheitsgrundsatz im Grundgesetz beruhrt wird, ist die Diskussion der Verfassungsmaßigkeit dieser Regelung nur konsequent.

주취자 보호조치에 관한 법적 검토

이성용 ( Sung Yong Lee ) 한국경찰법학회 2009 경찰법연구 Vol.7 No.2

Seit langem ist der polizeiliche Ausnuchterungsgewahrsam in Korea thematisiert, obwohl die polizeiliche Befugnis fur Ausnuchterungsgewahrsam im koreanischen Polizevollzugsgesetz kodifiziert ist. Das Hauptproblem des polizeilichen Gewahrsams kann man darin finden, wie das polizeiliche Ermessen im Rahmen des Gewahrsams rechtsmaßig kontrolliert werden kann. In der Tat gab es einige Falle, in denen Polizei ihre Gewahrsamsbefugnis mißgebraucht hat. An dieser Stelle wird diese Studie in funf Punkten zusammengefasst wie folgende: Erstens ist ein besonderes Gegetz fur Ausnuchterungsgewahrsam unnotigim Gegensatz zum bisherigen legislativen Versuch, weil es nicht gerechtfertigt werden kann, durch besonderes Gesetz das Ausnuchterungsgewahrsam zu regeln. Da kann man eine unnotige Diskriminierung der Betrunkenen im Rahmen des polizeilichen Gewahrsams sehen. Es ist eher empfehlenswert, jetztige Regelungen im Polizeivollzugsgesetz neu zu regeln. Zwitens ist die Einrichtung der Gewahrmszelle in einer Polizeistation unbedingt notwendeg, um jetzige Mißbrauche des Ausnuchterungsgewahrsam zu verhindern. Selbstverstandlich muss die arztliche Untersuchungen dabei vorausgesetzt werden. Drittens soll der Richtervorbehat auch beim polizeilichem Gewahrsam durchgesetz werden. Dadurch kann man die Rechtmaßigkeit und Gerechtfertigkeit des Gewahrsams erwarten. Viertens soll die jetzte Regelung fur Verhinderungsgewahrsam verbessert werden. Nach dieser Regelung kann ein Verhinderungsgewahrsam durchgesetzt werden, nur wenn eine Notwendigkeit der arztlichen Nothilfe vorliegt. Außerdem soll auch ein Verhinderungsgewahrsam fur den offentlichen Schutzgut anerkannt werden. Letztens ist in polizei-organisatorischer Ebene empfehlenswert, der Subjet des Befugnis fur Gewahrsams zu begrenzen.

동남아의 인구변동: 1950-2050년

이성용 ( Sung Yong Lee ) 한국동남아학회 2010 동남아시아연구 Vol.20 No.3

The purpose of this study is to examine the population changes in the nine Southeast Asian countries, including Cambodia, Lao People`s Democratic Republic, Philippine, Indonesia, Malaysia, Myanmar, Singapore, Vietnam, and Thailand. According to the demographic transition theory which described the transition from high birth and death rates to low birth and death rates, the demographic changes in less developed countries, including the Southeast Asian countries, follow the general pattern of the population changes that the Western countries had experienced. However, this theory does not consider the fact that the demographic behaviors such as fertility and mortality tend to be ethnocentric (or particular). Therefore, I examine in this paper both the generality and particularity of the population changes in the Southeast Asia. The analytic results are consistent with my assumptions. Every country in the Southeast Asia will soon reach the third phrase of the demographic transition and meet population ageing process. However, the timings arriving at the third phrase can differ. Singapore which is the most developed country had firstly passed through the demographic transition and the highest level of population ageing. Cambodia and Lao People`s Democratic Republic, the least developed countries, will lastly arrive at the third phrase and the ageing society. In addition, among the three countries which had experienced war or civil war, only Cambodia had experienced babyboom.