공정거래법의 운용방향

이계민,Lee, Gye-Min 대한석유협회 1982 석유와 에너지 Vol.1982 No.12

80년대 한국경제의 조감도

이계민 한국시멘트협회 1981 시멘트 Vol.83 No.-

Stratification in a Network Model of Information Exchange

이계민,김성곤,김광일 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.11

We propose a network model in which a node exchanges information with its neighbors and rewiresits link from a neighbor to the neighbor’s neighbor when it is given a greater chance to get a newitem of information. In simulations, the degree distribution evolves briefly from an initial uniformassignment to be scale-free in the tail, and then freezes with a heavier tail, which corresponds tothe monopolization of links by a few hubs. After freezing, the class of nodes in the middle of thedegree distribution shrinks, and information levels become stratified. Stratification is controlled bythe rewiring rate and the number of links per node. We suggest that increasing the connectednessof nodes is the best way to avoid stratification.

Equilibrium Point Analysis of A Multiple Access Protocol with a Code Reservation Scheme

이계민,강영경,전종우 한국자료분석학회 2004 Journal of the Korean Data Analysis Society Vol.6 No.6

We propose a multiple access protocol for a CDMA-based wireless communication system in which the terminals contend for the spreading codes and reserve the codes for multiple talk spurts. Equilibrium Point Analysis(EPA) is employed for the analysis of the proposed model and the recursive formulas for the system parameters are derived. We also present some numerical results corroborated by a simulated example.

Equilibrium Point Analysis of the Performance of IEEE 802.11 DCF under Poisson Packet Arrivals

이계민,강영경,최창원 한국자료분석학회 2005 Journal of the Korean Data Analysis Society Vol.7 No.5

The IEEE 802.11 standard has been widely deployed for wireless local area networks(WLANs) in recent years. The distributed coordination function (DCF) of 802.11 coordinates transmissions onto the shared communication channel. Under the DCF each station transmits packets depending on the channel state and its transmission packet queue. We propose a discrete time Markov model for 802.11 WLANs when packets arrive according to the Poisson process. We derive the average number of packets transmitted during a session and the channel throughput of the proposed model. Validation of the model is provided by numerical results which is corroborated by simulated examples.

김대중 정부 사회적 규제개혁의 성과와 과제:규제품질의 향상 관점에서

이계민 고려대학교 정부학연구소 2002 정부학연구 Vol.8 No.2

This paper focuses on establishing the criteria and standards of regulation reform in social policy field, through widely reviewing the previous studies on the evaluation factors of better regulation. In particular, based on practical experiences in the RRC(Regulatory Reform Committee), I review and evaluate the performance of social regulation reform in the terms of regulation quality, which has been driving by the Kim Dae-jung government since 1998. Although the government have to some extent made achievements in decreasing the total amount of regulations in social fields, it did not substantial performance because the efforts have too much focused on procedural deregulation for the resolution of the citizens’ discomfort and discontent. Also it did not take the comprehensive approaches about the problems because there were not any specific goal, well-defined scope and basic direction for deregulation. Furthermore since it has not still developed the tools and standard for rational regulations, it comes little improvements in the quality of regulations. 이번 연구는 규제품질의 평가요소들에 대한 선행연구를 면밀하게 재검토하여 사회분야 규제개혁의 평가준거로 활용하고자 한다. 특히 규제개혁위원회에서의 실무 경험을 토대로 1998년부터 4년간 김대중정부에서 추진한 사회분야에서의 규제개혁에 대한 성과를 규제품질의 제고라는 관점에서 검토·평가하였다. 김대중정부의 사회적 규제개혁이 나름대로 상당한 성과를 거두었음은 규제철폐의 총량적 실적이나 부문별 평가를 통해 확인할 수 있었다. 하지만 사회적 규제의 근본적인 접근이 이루어지지 않았고 국민불편 해소와 민원다발성 과제 등 절차적 규제완화에만 치우친 감이 없지 않다. 우선 국민생활불편해소를 위한 목표나 범위, 기본방향의 설정이 취약하여 다양한 규제대안을 강구해 규제의 품질을 높이려는 작업이 미흡하여 규제의 적 개선의 정도도 그렇게 높은 평가를 주기 어렵다.

제6차 경제사회발전 5개년계획의 방향 -정부작성지침을 중심으로본 특징과 과제-

이계민 한국시멘트협회 1985 시멘트 Vol.100 No.-

Creating Level Set Trees Using One-Class Support Vector Machines

이계민 한국정보과학회 2015 정보과학회논문지 Vol.42 No.1

A level set tree provides a useful representation of a multidimensional density function. Visualizing the data structure as a tree offers many advantages for data analysis and clustering. In this paper, we present a level set tree estimation algorithm for use with a set of data points. The proposed algorithm creates a level set tree from a family of level sets estimated over a whole range of levels from zero to infinity. Instead of estimating density function then thresholding, we directly estimate the density level sets using one-class support vector machines (OC-SVMs). The level set estimation is facilitated by the OC-SVM solution path algorithm. We demonstrate the proposed level set tree algorithm on benchmark data sets.

Wealth Networks with Sharing Earnings and Expanding Trade Volume

이계민,김광일 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.6

To explain the distribution of wealth in a society, we propose a growing network model in which each new node, representing an individual, becomes linked to other nodes. The links in the network represent contracts, which give both nodes chances to increase their wealth by producing earnings in proportion to the weight of the link, which represents a capacity for production. The two nodes connected by a link share these earnings in a given ratio and have chances to increase the weight of their link. The nodes have intrinsic levels of ability, allocated with a Beta distribution. We analyze the physical and the weighted degrees of the nodes, as well as the income and the wealth of the resulting networks. We show that, in all reasonable situations, these distributions stabilize, exhibiting scale-free tails. We also consider two societies with different ability distributions, while varying two key parameters, the sharing ratio and the rate at which the link weights are increased. As these parameters approach 1, the range scales expand, and the class of rich individuals becomes larger, and the poor and middle classes shrink. Finally, we show that the productivity of a network is optimized when the model is fair, meaning that each local contract is symmetric and the global ability distribution is uniform.

다중접근범주를 지원하는 IEEE 802.11 기반 네트워크의 모형화와 성능 분석

이계민,강영경 한국자료분석학회 2007 Journal of the Korean Data Analysis Society Vol.9 No.1

We model a network under an IEEE 802.11-based protocol for multiple access categories and carry out the performance analysis. Currently, 802.11 is the most widely deployed wireless LAN standard. The MAC layer of 802.11 is endowed with flexibility to provide a differentiated service for various types of packets through a diffrentiated backoff procedure. We present a Markov model for the state of each station under a finite load traffic condition and derive an numerical algorithm to find the transmission probability and the throughput. Most of the restrictive assumptions in the previous works are loosened in the way that each station can send an arbitrary type of packets and the length of a packet can be different depending on the access category. The proposed model is validated through simulation under various system settings. 무선랜 표준으로 가장 많이 사용되고 있는 IEEE 802.11을 확장하여 다중접근범주를 지원하는 개선된 메카니즘을 제안하고, 네트워크의 모형화와 성능분석을 실시한다. 제안된 프로토콜은 패킷의 다양한 유형별로 차별화된 서비스를 제공하기 위하여, 802.11의 매체접근제어층에 유연성을 부여하여 패킷의 접근 범주에 따른 차별화된 백오프 절차를 통하여 다중접근범주를 지원한다. 유한 트래픽 조건 아래서 네트워크의 각 스테이션의 상태를 마코프 모형으로 분석하고 상태별 극한 확률과 전송처리율을 구하는 수치해석적 알고리즘을 유도한다. 기존 연구에서의 제한적인 가정들을 완화하여 각 스테이션은 임의의 유형의 패킷 전송을 시도할 수 있고, 유형별 패킹의 길이도 다르다고 가정한다. 마지막으로 다양한 시스템 설정 하에서 시뮬레이션을 통한 모형 검증과 성능 평가를 실시한다.