멀티미디어 시스템의 통신 채널 모델링 및 성능분석

노철우,방석윤 한국콘텐츠학회 2005 한국콘텐츠학회논문지 Vol.5 No.1

In this paper, communication channels for the transmission of multimedia packets are modeled and evaluated. The multimedia packet traffic characterized by on-off and MMPP process for voice and data, respectively, dynamic channel allocation, queueing of data packets due to unavailability of channels and dropping of queued data packets over timeout, and guard channel for voice packets are modeled. The performance indices adopted in the evaluation of SRN model includes blocking and dropping probabilities. The SRN uses rewards concepts instead of the complicate numerical analysis required for the Markov chain. It is shown that our SRN modeling techniques provide an easier way to carry out performance analysis. 본 논문에서는 음성과 동영상을 포함한 멀티미디어 시스템의 통신 채널에 대한 모델링과 성능분석을 수행한다. 음성과 동영상에 적합한 서로 다른 도착 처리 과정을 고려한 멀티미디어 패킷의 입력 트래픽 특성, 통신 채널의 동적 할당 방법, 가용 채널 부족시 데이터 패킷의 큐잉 허용과 제한 시간 경과시의 패킷 손실 처리, 큐잉을 허용하지 않으나 가드 채널을 갖는 음성 패킷의 채널 처리 방식 등을 모델링하고 가용 채널 부족시 서비스를 받지 못하는 차단 확률과 큐에서 지정시간 경과시 손실되는 패킷 손실률 등의 성능 지표에 대한 수치결과를 분석한다. 이를 위하여 멀티미디어 시스템 통신 채널 SRN 모델을 개발한다. 본 논문에서 제시한 SRN 모델링 기법은 성능분석을 위하여 필요한 마르코프 체인의 복잡한 해석적 분석 대신 보상 개념에 의한 손쉬운 성능분석 방법을 보여준다.

MPLS VPN을 이용한 네트워크 플랫폼 구축

노철우 신라대학교 IT · 디자인연구원 2010 IT · 디자인 연구 Vol.- No.5

멀티캐스트 라우팅을 이용한 IPv6 네트워크 플랫폼 설계 및 구현

노철우 신라대학교 IT · 디자인연구원 2010 IT · 디자인 연구 Vol.- No.5

균일 마이크로 스트립 선로에서 디지털 펄스 신호의 시간영역 전송 특성 해석

김기래,노철우 신라대학교 자연과학연구소 1999 自然科學論文集 Vol.7 No.-

Recently the necessity of MMIC is increasing because clock frequency goes up by digital data transmission of Gbps class being demanded and the density of circuits gets high for the purpose of lightening and miniaturizing system, owing to the development of ultra high speed. In this paper, the distortion of square pulse and Gaussian pulse caused by dispersion as it propagates along a uniform microstrip line is investigated. A model dispersion of the phase constant proposed by Kirchning-Jansen is used to meet the frequency, accuracy, and microstrip parametric requirements. Numerical integration technique which has high accuracy and is easily simulated, is used to obtain the time domain response of pulse signals. The dispersion of pulse signals is analyzed regarding to the relative permittivity, substrate height, strip width of the microstrip line and pulse width of signal pulse. The simulation results show that small relative permittivity and small w/h ratio are advantageous for the dispersion of the pulse signals, and that pulse signals bandwidth cause smaller dispersion. The results of this paper are compatible to the trade-off determination of relative permittivity, substrate height, strip width and pulse width of signal pulse when a design of MIC and MMIC is necessary.

W-CDMA 망에서의 위치 서비스 기능 및 시스템 설계

노철우,노문환,김동회,송평중 新羅大學校 2002 論文集 Vol.51 No.-

The LoCation Services (LCS) feature in W-CDMA(Wideband CDMA) network provides the mechanisms to support mobile location services for operators, subscribers and third part service providers. The existing location positioning method are classified into the cell ID based, OTDOA, and network assisted GPS. A new hybrid location positioning method which combines three of these methods are proposed. We present the LCS funcition and system design using SDL (Specification and Description Language) and SDL development tool (SDT). This design covers the LCS functional model and signalling procedure, system architecture, data structrue, and process SDL diagram.

GNU Zebra를 이용한 임베디드 리눅스 라우터 개발

노철우,방석윤 신라대학교 자연과학연구소 2003 自然科學論文集 Vol.12 No.-

In this paper, we address the development of an embedded Linux router using the GNU Zebra routing protocol under the embedded Linux development environments. The objective is to establish the development methods of embedded system based on the porting of Linux kernel. The details of Linux kernel porting, which supports for a network protocol stack, to the dedicated hardware is described. By porting, the router embedded system is developed for replacing a high cost commercial router equipment with the implemented one. After establishing a test environment of the implemented router, the routing function is verified with the routing tables and performance analysis with one of the commercial routers is presented.

우리나라 적기시정조치제도의 현황 및 개선방안

노철우 한국금융법학회 2014 金融法硏究 Vol.11 No.2

The prompt corrective action (PCA) system was introduced for the first time in Denmark in 1994 when CBSBA was enacted. The USA also introduced the System in 1991 in order to deal with a lot of troubled depository institutions by the Federal Deposit Insurance Corporation Improvement Act (FDICIA) of 1991. The PCA system of USA has been a successful and desirable model for many other countries. Korea introduced the PCA system in 1992 by the Monetary and Financial Operation Committee in the Bank of Korea as a prudential regulatory measure for the banking institutions. Just before the Financial and Currency Crisis in 1997, the System was implemented very well for the financial institutions such as banks, securities companies, and insurance companies. During the Crisis, the PCA system carried out the important role of restructuring measures for the many troubled financial institutions. Afterwards, the Korean PCA system has been reformed and improved gradually. Recently the System has played an important role in restructuring the troubled mutual savings banks in Korea. However, there are still some areas to be reformed and improved in order that the Korean PCA system works more properly and efficiently. This paper suggests three points. First, the purpose of the Korean PCA includes to minimize the possibility of putting the Public Fund into troubled financial institutions. Second, the forbearance (suspension) of the PCA should be abolished. Third, the power of the Financial Services Commission on the PCA should be checked by the Korea Deposit Insurance Corporation which manages deposit insurance funds in Korea.

행정입법의 일환으로서 한국은행 규정의 의의, 성격 및 효력

노철우 한국금융법학회 2010 金融法硏究 Vol.7 No.1

The Purpose of the Bank of Korea Act is to contribute to the sound development of national economy by establishing the Bank of Korea and seeking price stabilization through the establishment and execution of effective monetary and credit policy. The monetary and credit policy by the Bank is a kind of economic administration and belongs to macro economy policies. The Bank of Korea implements its operations under the Bank of Korea Act, the Bank of Korea Monetary Stabilization Bond Act, the Management of the National Funds Act, the Foreign Exchange Transaction Act, and so on according to the principle of the rule of law. Especially, article 30 of the Bank of Korea Act stipulates that "the Monetary Board may establish regulations as necessary to discharge its duties."The first chapter of this paper deals with the purpose and scope of this study. The second chapter studies the overviews of administrative legislation. In the third chapter, I research disputes on the forms of administrative legislation pursuant to Act. In the fourth chapter, I deal with the definition, character and effect of regulations of the Bank of Korea. The fifth chapter studies the contents and suggestions on the Supreme Court's cases regarding regulations of the Bank of Korea. The Supreme Court pronounced that forms of administrative legislation pursuant to the Constitution are illustrative and the legislators are able to choose the forms of administrative legislation. Besides, the Supreme Court rendered judgement that the delegated legislation in forms of administrative regulations can be admitted in case of technical matters and the comprehensive delegation should not be permitted. The Regulation on Reserve Requirements of Financial Institutions, the Regulation on Rate of Interests on Deposits and Loans of Financial Institutions, etc. enacted by the Monetary Board, which have general and compulsory effects on financial institutions, have a character of regulative orders. And the legal relations between the Bank of Korea and financial institutions regarding above-mentioned operations of the Bank are public law relations. On the other hand, the Regulation on Issue of Bank of Korea Notes, the Regulation on Loans of the Bank of Korea for Financial Institutions, etc. enacted by the Monetary Board, which are adapted in the inside of the Bank in principle, have a character of administrative regulations. And the legal relations between the Bank of Korea and financial institutions regarding above-mentioned operations of the Bank are private law relations.

Vapor Refrigerant Injection Techniques for Heat Pump Systems: The Latest Literature Review and Discussion

노철우,유진우,김민수 대한설비공학회 2014 International Journal Of Air-Conditioning and Refr Vol.22 No.1

This paper reviews the latest and major research on vapor refrigerant injection techniques. Various vapor refrigerant injection techniques are discussed and compared. Compared to thebasic vapor injection (VI) cycle, double-expansion VI cycle, accumulator-VI cycle and the VIcycle in a cascade system are briefly explained. Studies about these various VI cycles do not onlyprove the performance of VI cycles, but also show variations of VI cycles. Discussions about thefundamental issues of the VI cycle are also presented.

WBI 교수모형을 이용한 페트리 네트 학습의 설계 및 구현

김경민,노철우 신라대학교 교육과학연구소 1999 교육과학연구 Vol.- No.4