• Journal of the Korean Society of Hazard Mitigation
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• v.8 no.4
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• pp.53-59
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• 2008

If fire is occurred in the subway, the train must be moved to the closest station and make passengers get off the train. As a matter of fact, the Fire of Dae-gu Subway was coped with this way. But, the fire smoke extraction system of real subway stations have not designed to deal with fire of trains yet. Therefore, we have to establish a plan of station railroad for preventing from unexpected damage when the fired train comes to the station. The purpose of this study is to establish the effective smoke extraction measure that is to prevent stations from damage by the scale-down experiment.

• The Journal of Society for e-Business Studies
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• v.21 no.4
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• pp.41-53
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• 2016

Today, leading smartphone manufacturers offer biometric technologies such as fingerprints, voice recognition, and iris patterns in their flagship models. These biometric technologies are used for authentication. Biometric authentications are widely used in device security and even in financial transaction. This paper examines cases where a user uses biometric authentication during financial transaction (both online and smartphone banking), and explains biometric for non-repudiation by digital signature. Finally, the paper also explains technical and legal requirements for biometric authentication in the area of financial services.

• Journal of IKEEE
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• v.24 no.2
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• pp.579-585
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• 2020

In this study, we used byte-inversion transmission method to prevent the flicker of lighting source in a visible light data communication link. In the transmitter, the non-return-to-zero (NRZ) signal with 9.6 kbps was on-off keying (OOK) modulated with a 100 kHz square wave carrier and byte-inversion signal was added after each byte to make the average optical power of the light-emitting diode (LED) constant. In the receiver, we used a band-pass filter to eliminate the interference of the 120 Hz noise which was induced from the adjacent light lamps, and an OOK demodulator to recover the original NRZ signal This scheme is useful in constructing wireless data networks using the illumination of visible light lamps.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2006.11a
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• pp.53-57
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• 2006

안전관리는 건설사업의 시공과정 중에 발생 가능한 유해, 위험으로부터 인명을 보호하는 것이며, 건설사업의 주제는 발주자로서 발주자 역할의 극대화는 효과적인 건설재해 방지의 관건이다. 건설프로젝트의 발주자, 설계자, 감리자, 시공자, 협력업자 등 다수 참여자의 장기간에 걸친 공동작업으로 이루어지는 건설공사의 특성을 고려할 때, 기존의 건설안전관리체제로는 건설공사에 수반되는 이와 다양한 유형의 사고를 방지하기 위한 근본적인 처방으로는 미흡하며, 건설산업의 총체적인 안전수준의 향상을 통한 시설품의 생애주기 전반에 걸쳐 안전성을 확보할 수 있는 근원적인 안전관리제도의 구축이 요구되고 있다. 실태조사 결과 공공발주자와 민간발주자의 안전의식 및 안전관리실태에는 격차가 크며, 대다수 발주자의 안전관리에 대한 책임의식이 미흡하며, 민간발주자의 경우가 훨씬 열악한 것으로 나타났다. 정부 감독기관의 발주자에 대한 안전책임 부여도 소극적이다. 발주자 안전관리가 미흡한 원인과 이의 촉진 방안에 대한 도출이 필요하다. 발주자에 대한 접근 방법의 홍보를 통한 책임의식의 고취, 발주자를 위한 안전관리매뉴얼 등 안전관리 도구의 제공, 법령을 동한 명확한 책임의 부여, 발주자가 책임을 이행할 수 있는 자질있는 안전전문가의 활용이 긴요한 것으로 사료된다.

• 주택과사람들
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• s.2
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• pp.8-21
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• 1990

[ $\triangle$ ] 건설부는 90.6.15 경부고속철도 및 신공항건설계획발표, 수도권내 공장 건설규제 완화 등과 관련하여 투기발생이 우려되는 지역을 토지거래 허가구역으로 지정하여 지가의 안정을 유지하면서 국토의 균형개발을 도모하기로 하였음. $\triangle$ 이번에 토지거래허가제가 실시되는 지역은 $\bullet$ 경부고속전철건설에 따라 영향을 받는 지역의 투기와 지가상승을 방지하기 위하여 역에서 반경 20km이내의 영향권내에 있는 천안시, 온양시, 청주시, 경주시전역과 안성군, 평택군 등의 일부 지역 $5,750.05km^{2}$와 $\bullet$ 신공항건설로 투기적 거래가 우려되는 신공항인근 지역과 공항진입도로, 진입철도 등의 설치로 향후 개발이 예상되는 이넌직할시, 부천시전역과 웅진군북 도면등 $129.37km^{2}$, $\bullet$ 수도권내의 공장설치규제가 완화됨에 따라 투기발생이 우려되는 지역과 수도권중 택지소유상한제가 실시되지 않는 지역에 대한 투기확산을 방지하기 위하여 경기도지역중 현재 허가제가 실시되고 있지 않은 $6,237.93km^{2}$, $\bullet$ 안면도 관광도지개발로 인하여 투기적거래과 우려됨에 따라 태안군 고남면 $26.48km^{2}$등을 허가구역으로 지정하게 되었음. $\triangle$ 이로써 허가구역은 현재 실시중인 지역 $28,323.47km^{2}$를 포함하여 전국토의 $40.78{\%}(40,467.30km^{2})$가 되며 신고구역은 $12,075.45km^{2}$가 감소하여 전국토의 $40.07{\%}(43,735.38km^{2})$가 됨.

• The Journal of the Korea institute of electronic communication sciences
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• v.11 no.6
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• pp.597-604
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• 2016

In this paper, we develope a speed control system of a BLDC motor for handpieces used in beauty applications. To reduce implementation cost, the control system utilizes hall sensors embedded in BLDC motors for speed estimation. The developed power module of a motor uses only 220V home voltage, so that the control system does not need any other power sources. An over-speed limit controller is also developed to slow down a motor when the speed goes up rapidly for a moment upon some heavy load is removed. The control system is designed to operate a handpiece with speed in the range of 5,000~30,000 RPM. Experiment results show the validity of the developed system, which maintains the speed of a motor steady even though a load is varied.

• Journal of IKEEE
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• v.23 no.2
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• pp.571-579
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• 2019

Visible light communication (VLC) performs illumination and communication simultaneously, thus it is important to prevent the flicker due to the optical power variation during data transmission and at the same time to have dimming control capability. In this paper, we used Manchester code for flicker-prevention and dimming control. In the transmitter, the duty factor of the Manchester code was used for controlling the LED illumination. In the receiver, the edge-spike signals of an RC-high pass filter were used for recovering the Manchester code while preventing the adjacent noise light. In experiments, the LED light was kept flicker-free and the average optical power was controlled in the range of 8~68 % of the continuous wave (CW) LED light by changing the duty factor of the Manchester code.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.8
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• pp.1466-1477
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• 2016

Public key infrastructure(PKI), principle technology of the certificate, is a security technology providing functions such as identification, non-repudiation, and anti-forgery of electronic documents on the Internet. Our government and financial organizations use PKI authentication using ActiveX to prevent security accident on the Internet service. However, like ActiveX, plug-in technology is vulnerable to security and inconvenience since it is only serviceable to certain browser. Therefore, the research on HTML5 authentication system has been conducted actively. Recently, domestic bank introduced PKI authentication complying with web standard for the first time. However, it still has inconvenience to register a certification on each website because of same origin policy of web storage. This paper proposes the certificate based SSO protocol that complying with web standard to provide user authentication using certificate on several sites by going around same origin policy and its security proof.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.22 no.6
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• pp.1283-1292
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• 2012

As delivery services market has grown the damage cases are also continuously increased. When using delivery services, Customers would not be compensated in any way. Perhaps worse, losing a cargo would create a great deal of trouble. Because the lack of evidence, they takes a lot of time to clarify who is responsible. To prevent these things, we must create, collect, maintain and confirm. In this paper, we introduce new delivery system with a trusted third party for non-repudiation services. Moreover, in damage case, we show that the proposed system is efficient and provide non-repudiation. Using sending and receiving codes, the proposed system identifies a responsible subject with quickness and clearness.

• Journal of the Korea institute for structural maintenance and inspection
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• v.13 no.4 s.56
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• pp.116-125
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• 2009

Recently, modular system are popular in construction fields, and they are increasing their marcket share. To compare modular units, bolting and welding are most popular methods. However, the temperature around a welded part might be over than 1,300$^{\circ}C and the composite member might be exposed tp the direct welding heat about 20,000$^{\circ}C. This high welding heat makes decrease of the concrete strength. If the concrete strength seriously decreases, it can affect the behavior and safty of a structure. On this study, To prevent of concrete strength decreases by welding heat, we suggested method of to insert between steel and concrete.