• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.10a
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• pp.440-443
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• 2008

적목 현상은 야간에 플래시를 이용하여 촬영 시 나타나는 현상으로, 대부분 미숙한 사진 촬영 방법으로 인해 많이 발생한다. 이러한 적목 현상은 수정 시에 이미지 틀을 이용하여 제거해야 되며, 이러한 방법은 많은 시간과 기술이 요구된다. 따라서 본 논문에서는 적목 현상이 일어난 영역을 자동으로 추출하여 제거하는 방법을 제안한다. 적목 영역은 RGB 레벨의 영상을, 각각 YCbCr과 HSI 컬러 공간으로 변환 후에 사람의 피부색 정보를 이용하여 얼굴 영역을 검출한다. 검출된 얼굴 영역에서 적목이 존재하는 눈 영역은 색상 정보와 8 방향 윤곽선 추적 방법을 적용하여 적목 영역을 검출한 후에 적목 현상을 제거한다. 제안된 적목 영역 추출 및 제친 방법을 적목 현상이 나타나는 30장의 영상을 대상으로 실험한 결과, 제안된 방법이 적목 영역 제거에 효과적임을 확인하였다.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.12 no.3
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• pp.236-242
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• 2002

This paper presents some advanced and supplemental methods to enhance the accuracy In case of calculating geometric divergence attenuation, attenuation by multiple screening structures, ground attenuation at unflat surfaces of sound during propagation outdoors by the methods specified in ISO 9613-2. Moreover, a calculation method for considering short-term wind effect, specified in ASJ Model-1998, is also introduced. To verity the accuracy of adopted methods, we have carried out highway traffic noise prediction and measurement at tile twelve locations appearing representative road shapes and structures, such as flat, retained cut, elevated, barrier-constructed roads. From the results, we have confirmed the predicted results show good correspondence with the measured at direct, diffracted and reflected sound fields within 30 m from the center of near side lane.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.12 no.8
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• pp.581-588
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• 2002

Precise highway traffic noise simulation and reduction require the accurate data for sound power levels omitted by vehicles, varied to road surface, traffic speed, vehicle types and makers, different from countries to countries. In this study, we have elaboratively measured Korea highway traffic noise and parameters affecting noise levels at the nearside carriageway edge. From numerical simulation using the measured results for highway traffic noise, we propose not only two correction factors to enhance the accuracy of Korea highway traffic sound power estimation using ASJ Model-1998 but also its typical power spectrum according to road surface type. The measured and predicted highway traffic noise levels using the proposed sound power show little difference within 1 dB.

• Electronics and Telecommunications Trends
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• v.20 no.2 s.92
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• pp.21-32
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• 2005

지능형 로봇은 인간 생활 환경에서 작동하고 일반 소비자를 대상으로 한다는 점에서 기존의 산업용 로봇과는 다른 내부 구조를 가져야 한다. 또한 표준화된 개방 구조를 갖추어 로봇 전용의 부품 산업이 활성화 될 수 있도록 하여 결과적으로 로봇의 단가를 낮출 수 있어야 한다. 본 고에서는 공장자동화와 자동차 분야에서 먼저 도입되고 있는 버스 형태의 제어 통신망이 지능형 로봇 분야에서 어떤 이점을 제공하는지에 대해 살펴보고, 최근의 2족 보행로봇에 성공적으로 적용되고 있는 대표적인 실시간 제어 통신망의 하나인 CAN에 대해 분석하고 CAN에 기반한 상위레벨 프로토콜을 소개한다.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.50 no.9
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• pp.459-466
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• 2001

This paper proposes a snubber circuit for flying capacitor multilevel inverter and converter. The proposed snubber circuit makes use of Undeland snubber as basic snubber unit. It has such an advantage of Undeland snubber used in the two-level inverter. Compared with conventional RCD/RLD snubber for multileve1 inverter and converter, the proposed snubber keeps such good features as fewer number of components, reduction of voltage stress of main switching devices due to low overvoltage, and improved efficiency of system due to low loss snubber. In this paper, the proposed snubber is applied to three-level flying capacitor inverter and this feature is demonstrated by computer simulation and experimental result.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1997.11a
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• pp.250-253
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• 1997

Generally, Piezoelectric ceramics based lead-zirconate-titanate(PZT) system are well known to use in high power devices. In this pacer. Pb(Mn$\sub$1/3//Sb$\sub$2/3/)O$_3$(PMS) ceramics which have been shown to be adaptable for a high power usage is introduced. The stability of piezoelectric properties in PZ-PT-PMS solid solution system such as piezoelectric constants. electromechanical coupling coefficient and mechanical quality factor is discussed by the addition effect of CeO$_2$ as a additive. The CeO$_2$ ratio ranges from 0 to 2 wt%. The resonant and anti-resonant frequencies. mechanical quality factor, and force factor are also measured as a function of vibration velocity

• Proceedings of the Korea Information Processing Society Conference
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• 2007.11a
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• pp.1214-1217
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• 2007

대부분의 기관들은 악의적인 행위들을 포착하거나 시스템과 데이터를 보호하고 사고에 대응하기 위한 시도들을 지원하기 위해 몇 가지 형태의 네트워크 기반 보안솔루션을 사용하고 있다. 하지만 기존 네트워크 레벨 보안의 한계로 인하여 시스템 상에서 일어나는 행위를 제어하기 위한 차세대 보안솔루션으로 보안운영체제를 도입하고 있다. 최근에는 전자금융거래법 등의 세칙에 의해 정보처리 시스템 내의 정보의 유출, 변조 및 파괴 등을 보호하는 것은 물론 세부 작업 내역의 로깅에 대한 요구가 지속적으로 증가하고 있다. 이에 본 논문에서는 보안레이블에 의한 시스템 보안 강화 기술을 소개하고 강제적 접근 제어 결과에 의해 생성되는 보안 로그에 대한 구체적인 관리 전략을 제시한다.

• Journal of the Korea Computer Industry Society
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• v.5 no.9
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• pp.851-858
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• 2004

This paper presents improved teaching and learning GUI for easily analysis tool of load flow of power system with database function for searching solution. In this paper includes not only contingency analysis function but also searching function of conditional solution sets from database of solution for various load levels. The GUI is friendly for study for power system operation and control because picture provide a better visualizing of relationshipsbetween input parameters and effects than a tabula type result. This GUI enables topologyand the output data of load flow for line outages to be shown on same picture page. Userscan input the system data for power flow on the the picture and can easily see the theresult diagram of bus voltage, bus power, line flow. It is also observe the effects of different types of variation of tap, shunt capacitor, loads level, line outages. Proposed GUI has been studied on the Ward-Hale 6-Bus system.

• The KIPS Transactions:PartC
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• v.15C no.6
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• pp.455-468
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• 2008

In this paper, we propose FAS model for establishing trust based on digital certificates in Grid security framework. The existing RBAC(Role Based Access Control) model is extended to provide permissions depending on the users‘ roles. The FAS model is designed for a system independent integrated Grid security by detailing and extending the fundamental architecture of user, role, and permission. FAS decides each user’s role, allocates access right, and publishes attribute certificate. FAS is composed of three modules: RDM, PCM, and CCM. The RDM decides roles of the user during trust negotiation process and improves the existing low level Grid security in which every single user maps a single shared local name. Both PCM and CCM confirm the capability of the user based on various policies that can restrict priority of the different user groups and roles. We have analyzed the FAS strategy with the complexity of the policy graph-based strategy. In particular, we focused on the algorithm for constructing the policy graph. As a result, the total running time was significantly reduced.

• Journal of the Korean earth science society
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• v.21 no.6
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• pp.655-662
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• 2000

According to the development of internet with Web, WBI has greatly influence on the present educational society. However, it is difficutly to design the web of the dynamic motions of graphics or animation using general programming technique based on high or low level language. Recently, Mecromedia Company supported a tool that is called Authoware which is the leading visual rich-media authoring solution for creating Web and online learning applications, to solve the problem easily. In the paper, using the the Authoware we tried to develop a web page about tidal variations due to sea level change and intertidal zone variations using the Authorware 5.1. To do this, we used the ocean survey data of Iho beach and the tidal level data based on Tidal Tables of Cheju harbor. The results showed that the Authorware was very useful to construct the simulation of tidal phenomena on web. Therefore, the Authorware can be applied to the simulation related with animation and dynamic motions for the other WBI objective.