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李鍾昌,林海喆 弘益大學校 1981 弘大論叢 Vol.13 No.-
As the amount of data is increased and complicated, some accidental or intentional infiltrations to the computer system itself and information in it are occurred. Therefore we must be currently able to safeguard from these infiltrations and accidents. In this paper, we investigate various types of invasions and propose protection mechanisms and methods to evaluate these in consideration of costs, environments, effectiveness, etc. 1. 서 론 2. 컴퓨터 시스템의 안전과 보안의 침해 요인과 대응책 3. 컴퓨터 시스템의 운영체제 측면에서의 안전과 보안 4. 평가 및 분석 5. 결 론 As the amount of data is increased and complicated, some accidental or intentional infiltrations to the computer system itself and information in it are occurred. Therefore we must be currently able to safeguard from these infiltrations and accidents. In this paper, we investigate various types of invasions and propose protection mechanisms and methods to evaluate these in consideration of costs, environments, effectiveness, etc.
이득변조를 통한 모드-록 레이저 다이오우드의 광특성 연구
李鐘昌,沈載勳 弘益大學校 科學技術硏究所 1996 科學技術硏究論文集 Vol.7 No.2
In this paper the optical properties of the colliding pulse model-locked laser diodes have been investigated utilizing a realistic model of the time varing random noise source, photon density, carrier density, and optical gain. The random noise source was shown to be a key parameter in analyzing the rate equations. After initial time interval this random noise showed a reduced value. The optical gain had a negative value in the initial state and a periodic positive value by injecting current, hence the photon density and the electron density varied with the optical gain.
李鐘昌,李載厚 弘益大學校 科學技術硏究所 2000 科學技術硏究論文集 Vol.11 No.-
A voltage controlled oscillator (VCO) by using a laser diode (LD) coupled resonant tunneling diode (RTD) has been proposed. The negative differential resistance characteristics of RTD's are analyzed by using an envelope model as well as the Wigner function model, and the dynamic behavior of LD's are modelled by using a time-dependent rate equations taking Langevin noise factors into account. In this paper a schematics for implementing VCO by using the LD-coupled RTD has been shown and the validity has been discussed by comparing experimental results published in the literature.
이종창,김용덕,강윤정,김미연 안동대학 안동사연구회 1986 安東史硏究 Vol.1 No.1
임하면 임하동에는 모두가 사기의 석탑이 있는데, 마을 국민학교 앞 논 가운데 삼층석탑이 있고, 거기서 약 500m남쪽으로 구릉 아래 밭 가운데 오층석탑이 또 그 서편 약 300m 거리 논 가운데 기단은 송두리채 소실되고 이층까지의 탑신 옥개만이 남은 파탑이 그리고 약 100m 서쪽 역시는 가운데 삼층 규모의 파탑이 있는데 그 하층기단은 거의 돌 무더기속에 묻히고, 상층기단도 반이나 없어진대로 이층까지만 남아 있다.
PERT/CPM 을 이용한 공정관리이론 및 컴퓨터 응용에 관한 연구
李鐘昌,林海喆 弘益大學校 1980 弘大論叢 Vol.12 No.-
Process control is the method to operate how to produce the product and to finish the project in a given time, with low cost, efficiently and effectively. As the scale of project is increasing, these large projects can't be managed with the method of BAR CHART which has been used previously. Thus, this paper suggests more advanced PERT/CPM method,merits of PERT/CPM, how to build the network diagram, how to analize time schedule, and implements it to computer system and tests and evaluates these methods.