• The Transactions of the Korean Institute of Electrical Engineers B
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• v.55 no.9
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• pp.443-448
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• 2006

Non-contacting capacitive sensor based on Thompson-Lampard theorem have been fabricated and characterized for measuring of 때 order displacements. To overcome disadvantages of the existed capacitive sensors of parallel plate type with 2-electrodes and 3-electrodes, the developed new sensor was designed to have 4-electrodes with a constant gap of 0.2mm between the electrodes. Two of the electrodes were used as a high potential electrode and a low one, the other two electrodes were used as guard electrodes. These electrodes were made from copper using RF sputtering system on a sapphire plate with diameter 17 mm and thickness 0.7 mm. This sensor can be used for measuring the distance not only between the sensor and metallic target connected to ground potential but also non-metallic target without ground connection.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2012.10a
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• pp.393-395
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• 2012

여수권역 해양교통시설에 해양기상 수집 시스템을 구축하여, AtoN AIS를 이용하여 주변을 항해중인 선박에 해양기상 정보를 직접 제공하고, AIS 기지국을 통해 해양기상 정보를 수집 처리하여 연안여객터미널, 해경 파출장소, 유관기관을 해양기상 정보를 제공함으로서 도서민이나 해양에 종사하는 사람, 레져 인구에게 제공하는 서비스로서 해양교통시설을 활용하여 좀 더 안전한 해양 업무를 수행하고 사고로 인한 인명 및 물적, 환경적인 피해를 줄일 수 있도록 한다. 여수권역 해양교통시설에 6개 국소와 별도의 기상관측 부이를 설치하여 대기기상(풍향/풍속, 기온/습도, 기압, 시정) 과 해양기상(유향/유속, 파향/파고, 수온)을 관측 할 수 있도록 구축하였으며, 기상관측 표준화법에 맞게 센서를 검정하고, 설치하여 관측 자료의 신뢰성을 확보하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2024.05a
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• pp.327-328
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• 2024

본 논문에서는 DarkWebGuard라는 실시간 악성 URL 탐지 시스템을 소개하고, 그 개발에 사용된 도구와 알고리즘에 대해 논의합니다. DarkWebGuard는 머신러닝을 기반으로 하며, 인터넷 보안에 대한 현재의 요구를 충족시키기 위해 개발되었습니다. 이 시스템은 사용자와 시스템을 보호하기 위해 악성 URL을 실시간으로 탐지하고 분류합니다.

• Proceedings of KOSOMES biannual meeting
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• 2018.06a
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• pp.38-38
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• 2018

• Korean Security Journal
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• no.12
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• pp.177-200
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• 2006

This research result that analysis as following. First, difference that keep in mind partially as result that verify difference of job-stress by demography special qualitys that is common people guard's society and turnover intention appeared. Second, result that analyze relation with job-stress and turnover intention, displayed statical correlation in job environment. Third, result that keep in mind as statistical as result that verify effect that common people guard's job-stress gets to turnover intention appeared. During is job-stress variable, was expose that exert effect that keep in mind to turnover intention job surrounding and job special quality. Suggestion point through this research as following be. To raise common people guard's job-stress and turnover intention. system improvement strategy about social estimation etc.. is effective, and do on the basis of this and may have to establish common people guard's enhancing morale plan strategy, low complement that can exert negative impact in change of post for example, line of duty that it is seldom competence, daytime that can elicit common people guards' job satisfaction. Is in visual point that activation of continuous research is leaned against by depth interview and review through qualitative research was insufficient relatively in virtue research so far in research after.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.43 no.3 s.345
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• pp.84-94
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• 2006

In this paper, we propose the algorithm to reduce guard time of UWB MAC time slot for throughput gain. In the proposed draft by multiband ofdm alliance (MBOA), Guard time of each medium access slot (MAS) is composed of shortest inter-frame space (SIFS) and MaxDrift which is the time caused by maximum frequency offset among devices. In this paper, to reduceguard time means that we nearly eliminate MaxDrift term from guard time. Each device of a piconet computes relative frequency offset from the device initiating piconet using periodically consecutive transferred beacon frames. Each device add or subtract the calculated relative frequency offset to the estimated each MAS starting point in order to synchronize with calculated MAS starting point of the device initiating piconet. According to verification of simulations, if the frequency offset estimator is implemented with 8 decimal bit, the ratio of the wasted time to Superframe is always less than 0.0001.

• Journal of Navigation and Port Research
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• v.41 no.6
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• pp.373-380
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• 2017

Operational errors caused by human factors, which is the major cause of marine accidents, include lack of knowledge, misunderstanding knowledge, and inadequate procedures. Recently, the type of propulsion mounted on KCG cutters has been diversified. In particular, the water jet propulsion unit, which was mainly installed in small boats, have been gradually expanded to medium and large size Coast Guard cutters, reaching 50% of the total. Axes types are divided into 2 to 4, and the bucket types are divided into Double Reverse Bucket(DRB) and Single Reverse Bucket(SRB); in these, the backward and steering control methods are completely different. Diversification of these operating systems can increase factors causing human error by the ships' operators. However, there is a lack of research on the maneuvering methods, considering the inherent active characteristics of each type of water jet. In this paper, we analyze the sideway method suitable for the condition of Coast Guard Exclusive wharf without assistance, based on the astern performance of each type. Then, a ship handling simulator was used for the experiment; they compared and verified through interviews of captains.

• Journal of the Korean Institute of Intelligent Systems
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• v.17 no.6
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• pp.786-791
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• 2007

In the place that its security is crucial, the necessity of system which can tract and recognize random person is getting more important. In this paper, we'd like to develop the invader tracking system which consists of the sound source tracking-sensor and the pan-tilt camera for wide-area guard. After detecting the direction of any sound with the sound source tracking-sensor at first, our system make move the pan-tilt camera to that direction and extract reference image from that camera. This reference image is compared and updated by the next captured image after some interval time. By keeping on it over again, we can realize the guard system which can tract an invader using the difference image and the result of another image processing. By linking home network security system, the suggested system can provide some interfacing functions for the security service of the public facilities as well as that of home.

• Korean Security Journal
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• no.17
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• pp.69-89
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• 2008

As year passes, terrorism is gradually increasing. Its target has becom various and arbitary, and recently, terrorists are aiming for national major facilities wich include multiplex facilities. Although special security guards took charge of its defence system from 2002, they have failed to establish its system firmly due to some institutional inertia. And 'Professionalism' appeared to be the mattter, according to the spot-probe and interviews. The purpose of this essay is to devise measures to develop sepecial security system including its specialization through investigating current educational training system. In order to attain professionalism, establishment of new proffessional school, division of current education system(into common education and full-course education), and reinforcement of substantial inspection activity should be preceded. Moreover, inspection activity should include standards for engaging instructors, establishment of compilation committee for editorial supervision, and establishment of clear educational policy. I hope the developmental measures in this essay to be speedily actualized with endeavor from police, security association, academic circles.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.9C
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• pp.1279-1288
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• 2004

In this paper, the DMR(Digital Microwave Radio) system-based OFDM(Orthogonal Frequency Division Multiplexing) scheme in microwave channel environments has been proposed and system performances have been evaluated. The existing single carrier DMR system has a complex system structure due to using high-level QAM(Quadrature Amplitude Modulation) modulation scheme and so charmel capacity is limited by sensitive effects from fading. Therefore, in the proposed DMR system, it uses that the OFDM scheme for enhancement of fading distortion and also uses that the band-limited pulse shaping filter instead of windowing for no additional data such as GI/GB and for using efficient of IFFT/FFT block. The performance of OFDM/QPSK-DMR system and single carrier DMR system are analysed by computer simulation using two-ray model under the microwave channel environments The computer simulation results confirm that the fade margin of the proposed OFDM/QPSK-DMR system is highly increased as the number of sub-carriers is larger.