• 항공우주정책ㆍ법학회지
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• 제22권2호
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• pp.155-175
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• 2007

As intellectual terror threats increase, we feel the limit in coping with those threats and the things we do are placing traditional X-ray machines & ETD and increasing aviation security staffs. In fact, even if air transportation system is the fast and most efficient transportation methods, it is true that there are many inconveniences to endure due to terror threats. In the name of security, even if we make a lot of efforts and time to screen both good-natured passengers, baggage, cargo and suspicious passengers, it is impossible to screen perfectly and it is not an efficient methods. Therefore, we introduce profiling system that reduce the effort to screen good-natured passengers but focus on screening dangerous passengers and baggages. Profiling system strengthens aviation security, using the concept "Selection & Concentration". Israel started to introduce manual profiling system in aviation security, which is interviewing suspicious passengers and it has been used in crime investigation since 1960. And it has been upgraded and diversified to CAPPS(Computer Assisted Passenger Screening Program) and SPOT(Screening Passenger by Observation). So, this theses is to study on the concept & kind of profiling and profiling methods adopted in airlines. Also it presents the method of introduction of profiling system in Korea and the necessity of making law on it.

• 대한전기학회논문지
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• 제39권2호
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• pp.133-141
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• 1990

In the operation of an electric power system, the voltage security of the system has acquired more significant importance after the occurrence of large system black-outs caused by voltage collapse several times. This paper describes a fast contingency screening method concerning voltage security. The method defines a voltage-sensitive buses where significant voltage changes would occur as a result of the contingency to reduce the number of bus voltages to be solved for continngency screening. This method is based on the observation that it is not necessary to solve the entire network in most contingency cases because boltage changes actually occur around the contingency. The P-Q decoupled linearized model and the fast error correction method are also adopted in the method to define voltage-sensitive buses and to calculate voltage magnitude on the selected voltage-sensitive buses fastly and reliably. The method suggested in this papaer has been tested in IEEE 30-bus model system and KEPCO 130-bus actual system and its effectiveness for practical use has also been confirmed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1988년도 전기.전자공학 학술대회 논문집
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• pp.879-882
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• 1988

This paper describes a fast security analysis techique for voltage security assessment. The new method identifies the location of buses with potential voltage problems and thereby defines a voltage-sensitive subnetwork for contingency screening. The efficieny of this method is derived from the use of a voltage subnetwork to drastically reduce the number of bus voltages to be solved; and subsequently from the use of compensation techniques and sparse-vectors methods for screening. Results demonstrating the effectiveness of the method on the IEEE-14 bus model system are presented.

• 산업과 과학
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• 제1권2호
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• pp.30-36
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• 2022

의학이 고도로 발달한 2022년에도 범유행 감염병은 지속해서 발생하고 있다. 2019년 발생한 코로나-19는 전염성이 강하여 많은 감염자를 발생시키고 있다. 국내에서는 코로나-19의 확산 방지를 위해 선별 진료소 및 호흡기 클리닉 등의 임시 선별 진료소를 증설했지만, 검사를 받기 위한 인구가 몰려 병목현상이 생기고 이에 따라 검사를 받지 못하는 등의 문제점이 있다. 본 연구에서는 문제점을 해결하기 위해 선별 진료소로 코로나-19 검사를 받으려는 사람들을 실시간으로 파악하고자 한다. 실시간 데이터베이스를 활용하여 선별 진료소와 연동하고 사용자에게 선별 진료소별 실시간 현황을 제공한다. 앱을 이용하면 사용자는 실시간으로 선별 진료소 상황을 파악할 수 있고 원활한 진료소를 선택할 수 있다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 추계학술대회 논문집 전력기술부문
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• pp.73-76
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• 2001

This paper presents a new systematic contingency selection, screening and ranking method for on-line transient security assessment. Transient stability of a particular generator is influenced most by fault near it. Fault at the transmission lines adjacent to the generators are selected as contingency. Two screening methods are developed using the sensitivity of modal synchronizing torque coefficient and computing an approximate critical clearing time(CCT) without time simulation. The first method, which considers only synchronizing power, may mislead in some cases since it does not consider the acceleration power. The approximate CCT method, which consider both the acceleration and deceleration power, worked well. Finally the Single Machine Equivalent(SIME) method is implemented using IPLAN of PSS/E for detailed stability analysis.

• 디지털융복합연구
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• 제12권2호
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• pp.563-570
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• 2014

정보보호의 중요성이 커지면서 안전행정부, 미래창조과학부, 교육부, 국가정보원 등 소관부처별 정보보안에 대한 심사기준을 제정하고 평가를 시행하고 있는 실정이다. 특히 2010년 G-ISMS, 2011년 개인정보보호법 시행 등 최근 정보보호의 중요성이 커지면서 보다 효과적인 정보보호 관리를 위한 노력이 커지고 있다. 이러한 각종 정보보호 인증과 심사는 공공기관의 정보보호 수준을 향상시키는데 많은 도움을 주고 있으나, 실무 기관에서는 연중 수시로 있는 소관부처별 인증심사로 인해 업무효율성이 저하되고 효과적인 보안관리에는 한계가 있다. 본 논문에서는 현재 공공기관을 대상으로 실시되는 정보보호 관리 심사기준을 분석하고, 한계점과 개선방향을 제시하고자 한다.

• 방사선산업학회지
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• 제17권4호
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• pp.377-384
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• 2023

In this study, the image quality assessment, especially spatial resolution evaluation, for Sparse-view CT reconstructed images was performed. The main goal of the experiment is to evaluate Modulation Transfer Function by using American Standard Method for Measurement of Computed Tomography System Performance(ASTM E1695-95) which uses the edge test object. To compare with the ASTM method, a different method, the radial-type edge profile, to measure MTF using the edge method also performed. Both approaches were tested on the same image acquired by the stationary-gantry sparse-view CT security-screening system using cylindrical test phantom manufactured in accordance with ANSI 42.45. Both of the spatial resolutions at 10% modulation are 0.195, 0.203lp pixel^-1, respectively. The method implemented by ASTM E1695-95 showed higher reliability and had a relatively more accurate spatial resolution result than the radial-type edge profile method.

• 대한전기학회논문지:전력기술부문A
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• 제49권6호
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• pp.305-311
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• 2000

This paper presents a hybrid algorithm for solving optimal power flow(OPF) in order to enhance a systems capability to cope with outages, which is based on combined application of evolutionary computation and local search method. The efficient algorithm combining main advantages of two methods is as follows : Firstly, evolutionary computation is used to perform global exploitation among a population. This gives a good initial point of conventional method. Then, local methods are used to perform local exploitation. The hybrid approach often outperforms either method operating alone and reduces the total computation time. The objective function of the security constrained OPF is the minimization of generation fuel costs and real power losses. The resulting optimal operating point has to be feasible after outages such as any single line outage(respect of voltage magnitude, reactive power generation and power flow limits). In OPF considering security, the outages are selected by contingency ranking method(contingency screening model). The OPF considering security, the outages are selected by contingency ranking method(contingency screening model). The method proposed is applied to IEEE 30 buses system to show its effectiveness.

• 한국항공운항학회:학술대회논문집
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• 한국항공운항학회 2005년도 추계학술발표대회 논문집
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• pp.91-93
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• 2005

• 실천공학교육논문지
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• 제15권2호
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• pp.495-502
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• 2023

우리나라는 세계적으로 국가 암검진 지원을 오랜 시간 지원하고 있음에도 불구하고 암검진 수검률은 다른 건강검진과 영유아 검진에 비교해 저조한 수검률을 보인다. 특히, 여성 장애인은 여성 비장애인과 비교해 자궁경부암 검진에서 더 낮은 수검률을 보인다. 따라서 이 연구는 2011~2019년 동안 30세 이상 여성 장애인과 비장애인의 자궁경부암 검진 수검률의 추이를 알아보고, 지역 간의 자궁경부암 수검률을 통해 여성 장애인의 자궁경부암 수검에 영향을 미치는 요인을 개인 수준과 지역 수준으로 지역 간 변이에 어느 정도 영향을 미치는지 알아보고자 한다. 2011~2019년도까지 장애인의 자궁경부암 수검률은 대전이 가장 높았고 세종과 제주지역이 가장 낮게 나타났으며, 지역별 장애인의 자궁경부암 수검률 격차는 최대 13.1%로 분석되었다.