• Journal of Korea Water Resources Association
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• v.52 no.4
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• pp.265-277
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• 2019

The objective of this study was to develop and verify an effective vortex typed nonfilter nonpoint source pollution reduction device. To verify this pollution reduction device, a total of twelves scenarios (three rainfall intensities${\times}$two states${\times}$two steps) of experiments were conducted using pollutants. First, simulated inflow (rainfall intensity 2.5 mm/hr: $0.00152m^3/s$, rainfall intensity 3.395 mm/hr: $0.00206m^3/s$, rainfall intensity 6.870 mm/hr: $0.00326m^3/s$) was calculated. Second, pollutants (mixture of 25% of four particle sizes) were selected and injected. Third, pollutant removal efficiencies of this device at its initial state and operating states were measured. As a result of analysis based on rainfall intensity, the concentration of pollutants was decreased by the device at initial and operating states at all rainfall intensities. Its pollutant removal efficiency was more than 80%, the standard set by the Ministry of Environment. Its pollutant removal efficiency was gradually increased over time, reaching approximately 90%. Its pollutant removal efficiency was higher in its operating state than that in its initial state. Therefore, nonpoint source pollutants can be effectively removed by this vortex typed nonpoint source pollution reduction device developed in this study.

• Bulletin of Korea Environmental Preservation Association
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• v.17 no.12
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• pp.34-35
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• 1995

• 한국상하수도협회지
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• s.9
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• pp.70-73
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• 2005

• Journal of the KSME
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• v.32 no.3
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• pp.290-299
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• 1992

대기질의 악화와 오염원이 많아짐에 따라, 실내공기 정화장치 또한 재래식의 방법을 벗어난 방 식으로 설계 시설되어야 한다. 인위적으로 만들어진 유해 물질과 작은 먼지들을 제거하기 위한 새로운 환풍장치는 지역의 특수성을 고려하여 설계되어야 한다. 더욱이 대도시의 생활은 오염 원과 작업장 및 거주지가 가까이 위치하기 때문에 특별히 지역의 특수성을 고려하여 환풍장치가 설계되어야 한다. 끝으로 작업장안에서 오염원 격리수용하는 것은 매우 바람직하여, 청정공 간(clean room)을 요구하는 반도체 및 제약회사 등은 건축물자체 오염원에서 멀리 떨어져서 지 역의 영향을 최소화하는 것과 건축물의 자재 및 공기정화장치가 새롭게 연구되어 설계되야 한다.

• Journal of the Korean Magnetics Society
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• v.3 no.2
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• pp.149-154
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• 1993

정보를 자기적으로 기록하는 장치는 전원이 제거되어도 정보를 잃지 않으며, 기록과 재생이 모두 가능하고, 상대적으로 저렴한 가격 때문에 현재 광범위하게 이용되고 있다. 컴퓨터 보조 기억 장치로 사용되는 하드디스크, 프라피 디스크, 테잎 드라이버(driver)로 부터 음성 및 화상 기록 장치로 사용되는 녹음기 및 VCR 과 컴퓨터, 음성, 화상 이외의 정보 (Surveillance, Telemetry, Flight information, Sa- tellite linkage 등)를 기록하는 instrumentation recorder 등이 대표적인 자기 기록 장치이다. 이러한 자 기 기록 장치는 원하는 전기적인 정보를 자기적인 정보로 바꾸어 기록하며, 기록된 정보를 필요에 따라 전 기적인 정보를 바꾸어 사용하게 된다.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.4 no.2
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• pp.161-170
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• 2006

PFC(Perfluorocarbon) decontamination process is one of best methods to remove hot particulate adhered on the inner surface of hot cell and surface of equipment in hot cell. It was necessary to develop a filtration equipment to reuse the PFC waste solution generated on PFC decontamination due to the high cost of PFC solution and for minimization of the volume of second waste solution. The filtration equipment was developed to remove hot particulate in PFC waste solution. It was made suitable size and weight in consideration of hot cell gate and crane. And it has wheels for easy movement. Flux of the filtration equipment decreased with particulate concentration increase. It consists of pre-filter($1.4{\mu}m$) and final-filter($0.2{\mu}m$) for protection of the flux decrease along filtration time. It treatment capacity of waste solution is 0.2 L/min.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 1999.10a
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• pp.397-398
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• 1999

활성탄은 1,000m$^2$/g 이상의 큰 표면적을 가지며, 이것을 활용하여 공업적인 용도로 예부터 탈취제와 같은 흡착제로서 이용되고 있다. 최근에는 생활 수준의 향상으로 인해 악취에 대해 민감해져서 악취 제거제로서 활성탄의 사용량은 갈수록 늘어나고 있는 추세이다. 특히 우리나라의 경우 공업단지 주변에서의 악취에 대한 민원이 급증함으로써 여러 악취발생업체에서 악취 제거장치로서 활성탄을 이용하는 곳이 많아지고 있다.(중략)

• Journal of the Korean Institute of Intelligent Systems
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• v.22 no.5
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• pp.663-668
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• 2012

A TPMS(Tire Pressure Monitoring System) is a wireless communication system designed to monitor the pressure and temperature of pneumatic tires of a vehicle. In order to provide the aid in protecting a driver, this system reports tire pressure information to the driver of the vehicle. Since the wireless communication technique should be employed to transmit the TPMS data from each tire to signal processing unit in the vehicle, it suffers from interference signals from external electrical or electronics equipments. In this paper, we propose the TPMS interference cancellation technique based on GSC(Generalized Sidelobe Canceler), which does not have only the excellent performance like MVDR(Minimum-Variance-Distortionless-Response) but also has the low computational complexity comparing with MVDR. The performance of interference suppression is conformed by computer simulation examples.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.30 no.5
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• pp.771-780
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• 2020

QKD(Quantum Key Distribution) is one of the protocols that can make two distant parties safely share secure keys against the threat of quantum computer. Generally, cryptographic applications which are connected to the QKD device have fixed roles as a transmitter and a receiver due to the race condition and complexity of implementation. Because the conventional QKD system is mainly applied to the link encryptor, there are no problems even if the roles of the cryptographic devices are fixed. We propose a new scheme of QKD system and protocol that is easy to extend to the QKD network by eliminating quantum key dependency between cryptographic device and QKD node. The secure keys which are generated by the TRNG(True Random Number Generator) are provided to the cryptographic applications instead of quantum keys. We design an architecture to transmit safely the secure keys using the inbound and outbound quantum keys which are shared between two nodes. In this scheme, since the dependency of shared quantum keys between two QKD nodes is eliminated, all cryptographic applicatons can be a master or a slave depending on who initiates the cryptographic communications.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.10
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• pp.2596-2601
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• 2009

Gouging is defined as the removal of weld metal and base metal from the opposite of a partially welded joint to facilitate complete joint penetration. Since the work by current method needs skillful welding and grinding, there is a limit on the increase of operation efficiency. Noise and dust from the weld gouging also deteriorate the work place and cause environmental problems. In this study, the gouging work by cutting method is proposed to overcome the defects from weld gouging such as low productivity, severe noise, dense dust, and so on. The developed cutting gouging system removes material as much as $13,565mm^3/min$, and enlarge the labor productivity as three times compared to that by weld gouging method.