• Proceedings of the Korea Information Processing Society Conference
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• 2005.05a
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• pp.1131-1134
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• 2005

정보보호를 위해 네트워크 수준에서의 침입탐지 시스템이나 방화벽 시스템을 사용한다. 그러나 외부에서의 공격을 네트워크 수준에서 미처 대비하지 못하였을 경우에는 각 호스트들은 무방비 상태이므로 공격받을 경우 침형적인 피해를 입을 수 있다. 이러한 피해를 막기 위해서는 운영체제단에서의 대비가 필요하다. 이에 본 논문에서는 보안 운영체제 연구에 대한 동향을 살펴보고, MLS(Multi Level Security)정책을 사용하는 보안 운영체제에서 보안등급이 서로 다른 주체와 객체의 긴급접근이 이루어져야 할 때, 기존 MLS의 참조모니터(Reference Monitor)를 개선시켜 접근을 해결하는 방안을 제시했다.

• Journal of the Korean Society of Radiology
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• v.9 no.2
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• pp.109-115
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• 2015

In case of a CT examinations, there is a difference in the distribution of radiation dose from that of general X-ray equipments, and it has been known to cause a great radiation exposure during the examinations. However, owing to its high reliability on the accuracy of a examinations result, its use has increased continuously. In consideration of such a circumstance, the CT equipment, radiation dose during CT examinations, diagnostic reference level, and solutions to reduce radiation dose were mentioned on the basis of previously reported data.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.19 no.1
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• pp.50-55
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• 2009

The monitoring efficiency of the aircraft noise monitoring stations is decided to the reference noise level and the infringement of each monitoring stations. We calcurates the monitoring efficiency of three noise monitoring station among twelve in the vicinity of Gimpo Int'l Airport. As a result, the monitoring efficiency shows that the noise monitoring stations No#3, No#5 and No#6 are 14.3%, 18.5% and 29.3% respectively, Among them No#6 staion looks higher efficiency than another two stations because of underneath the flight trackas.

• Proceedings of the KIEE Conference
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• 1999.07g
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• pp.3196-3198
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• 1999

In this paper, we are proposed ATM AAL 1 source clock recovery methods for CBR service. The proposed method compute the difference between network clock level and the reference level by inspecting the variation of a buffer. Also it is the service clock recovery method that control local clock using the look-up table defined clock dividing rate of the difference in advance. It can be applicable to both SDH network and PDH network which has no common reference clock between its ends, it has an important mean in view of the internetworking between existing networks for the integrated service chased by B_ISDN.

• Journal of Power Electronics
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• v.17 no.6
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• pp.1480-1489
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• 2017

In this study, a carrier-based pulse-width modulation (PWM) method for two-level voltage source inverters in the over-modulation region is proposed. Based on the superposition principle, the reference voltage vectors outside the linear modulation boundary are adjusted to relocate to the vector hexagon, while their fundamental magnitudes are retained. In accordance with the adjusted reference vector, the corresponding modulated waves are respectively deduced in over-modulation mode I and II to generate the gate signals of the power switches, guaranteeing the linearity of the fundamental output phase voltage in the over-modulation region. Moreover, due to the linear relationship between the voltage vector and the duty ratios, the complicated sector identification and holding angle calculation found in previous methods are avoided in the modulated wave synthesis, which provides great simplicity for the proposed carrier-based over-modulation strategy. Experimental results demonstrate the effectiveness and validity of the proposed method.

• The Journal of the Acoustical Society of Korea
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• v.5 no.4
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• pp.27-36
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• 1986

본 논문은 특정 화자에 대한 하국어 연속음의 효율적인 인식을 위하여, 구문분석과 OGS기법으 로 변형시킨 Level Building을 이용한 인식시스템에 대해서 제안하고 있다. 본 시스템에서 사용하는 template는 연속음을 분할시킨 단독음이며 소구간 경로 및 본 논문에서 제안한 전체 경로 제약에 의해 거리 계산값이 최소인 super reference를 구함으로써 인식된다. 본 연구에서 사용한 연속음은 단독음 11 자로 구성된 13개의 전철역명으로서 2인의 남성과 1인의 여성화자에 의해 10번씩 발음한 130단어를 테 스트하였는데 97.7%의 단어인식을 보였다.

• Proceedings of the KIPE Conference
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• 2019.07a
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• pp.315-316
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• 2019

This paper proposes the operation scheme and control method for a four-level hybrid half-bridge flying-capacitor inverter (4L-HHBFCI). With in-phase disposition level-shifted modulation (IPD), the flying capacitor voltage ripple is less than 1% of the reference value, while the line-to-line voltage total harmonic distortion is 23.27% at unity modulation index. The performance and effectiveness of the proposed inverter operation have been verified by simulation results.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2004.11a
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• pp.298-299
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• 2004

• Proceedings of the Korean Quaternary Association Conference
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• 1990.08a
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• pp.65-65
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• 1990

No abstract, See Full-text

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2018.11a
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• pp.307-308
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• 2018