• Information and Communications Magazine
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• v.30 no.11
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• pp.15-23
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• 2013

최근 전 세계적으로 도로교통의 안전성 제고와 효율성 증진, 환경성 및 지속가능성 확보를 목적으로 추진되고 있는 C-ITS의 동향분석을 통해 C-ITS의 아키텍처 및 ITS Station 구성내용을 정리하였다. C-ITS 핵심요소인 ITS Station의 구성방안은 유럽의 DRIVE C2X, 미국의 Connected Vehicle Program의 Model Deployment인 Safety Pilot 프로젝트, 일본의 C-ITS 추진계획, 한국의 SMART Highway 연구개발 사례를 통해 도출하였다. 국내외 C-ITS 연구개발 사례와 국내 도로교통여건 및 현 ITS 환경을 고려한 C-ITS 아키텍처와 ITS Station 구성방안을 4가지 구성요소별로 제시하였고 차량용 ITS Station과 노변 ITS Station의 주요 고려사항과 요구기능으로 현 ITS를 적극적으로 수용하면서 C-ITS 단말의 보급률을 확대하는 방안으로 제안하였다.

• Journal of Korean Society of Environmental Engineers
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• v.22 no.1
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• pp.121-132
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• 2000

This study is to investigate the performance of a new BNR process using predenitrification scheme focusing on nitrogen removal and the possibility of adapting a computer simulation scheme in BNR process development. By using a pre-denitrification basin, higher $COD/NO_3-N$ ratio could be sustained in this BNR process. The results of the investigation showed a SDNR value of 9.04mg/gMv/hr. In the anoxic tank, the average value of SPRR of 6.25mgP/gMv/hr was observed to be very sensitive to SCOD load of influents. By calibrating internal parameters (stoichiometric and kinetic parameters) of the simulation model, the results of simulation for various BNR processes gave good agreement with observed data. The major adjustment was given with three parameters, maximum specific growth rate of heterotrophic biomass, short chain fatty acid (SCFA) limit, and phosphorous release rate. With the series of simulations on varying operational conditions, the simulation by computer program can be a useful tool for process selection, and design and operation of municipal wastewater treatment plant.

• 한국가스학회:학술대회논문집
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• 2003.10a
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• pp.85-90
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• 2003

Korea Gas Corp. has developed the design technology of the LNG storage tank. The membrane to be applied inside of LNG storage tank is provided with corrugations to absorb thermal contraction and expansion caused by LNG temperature. We constructed strain measurement system by using strain gage. In this paper, some problems which should be considered when measuring strain at $-162^{\circ}C$, are discussed by presenting test results on the characteristics of strain gages, Temperature sensor, adhesive and lead wire. And presenting the procedure of the constructing strain measurement system.

• Journal of Biosystems Engineering
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• v.24 no.4
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• pp.359-364
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• 1999

A theoretical model was developed to evaluate the influence of control variables on the composting performance in a bin composting system. The model was verified using pilot scale composting system. Simulation of the composting temperature according to air flow rate and composting bin size was conducted using the mathematical model. High composting temperature above 55$^{\circ}C$ needed to kill a pathogen was maintained for longer periods as the air flow rate was lower and the bin size was larger. Optimum air flow rate was 0.77L/min/kg.DM for the experimental pilot scale bin system. The size of composting bin should be large enough to maintain the higher composting temperature for required periods.

• Proceedings of the KIEE Conference
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• 1998.07e
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• pp.1806-1808
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• 1998

Tests of pilot-scale plasma DeSOx-DeNOx system using pulsed streamer corona were carried out. The system consists of the reactor with wire-plate electrodes the $30kW_{max}$. MPC type pulse generator, and $1MW_{th}$ pulverized coal combustor as a flue gas source. $NH_3$ and $C_2H_4$ were used to enhance the removal rate. The experimental result on the removal efficiency of SOx/NOx and on the effect of the additives was presented in this paper.

• Proceedings of the KIEE Conference
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• 2005.07d
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• pp.2671-2674
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• 2005

Auto Pilot System is the device for course keeping or course altering to ship's steering system. The purpose of automatic steering system is to keep the ship's course stable with the minimum course and rudder angle. Recently, modem control theories are being used widely in analyzing and designing the ship system. Though P.I.D type auto pilots are widely used in ships, the stability and the adjusting meyhods are not clarified. In this paper the authors proposed auto pilot system with Fuzzy Logic Controller. In the fuzzy control the things that the actual operators of a steering wheel has acquired through their experience can be logically described by the Lingustic Control Rule. The characteristic of the control system were investi gated through the computer simulation results. it was found that the fuzzy logic control was more efficient than the conventional system.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2009.04a
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• pp.73-76
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• 2009

Increase in tensile strength of steel is important for fuel efficiency and $CO_2$ reduction. But the higher the strip strength, the more defect could be generated in hot strip mill. This study focuses on line-type edge scab. One of the causes for the defect is initial edge cracks commonly observed on a slab but their correlation has not been verified yet. Thus, the objective of this report is to verify if the edge crack is exactly the seed for edge scab. For this, we conducted pilot hot rolling test with cracked slab and compared the development of cracks and edge scabs on hot-rolled strip.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2006.05a
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• pp.195-196
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• 2006

Direct laser sintering (DLS) technology for the resign coated sand is one of attractive technologies to produce molds and cores for the foundry industry rapidly and cost effectively. The objective of this case study is to develop casting pilot models using computer simulation technology, DLS RP machine and industrial computed tomography. The proposed casting design was verified by the Z-Cast software in the fields of fluid flow and solidification during the casting process. Casting parts with aluminum alloy using the post-curing treated sand moulds and cores are accurate to dimension and defect free.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.26 no.6A
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• pp.913-922
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• 2001

Multi-Carrier CDMA 시스템에서 불완전한 채널 예측과 다중사용자 간섭은 시스템의 성능 저하를 유발한다. 본 논문에서는 역방향 링크에서 파일럿 심볼을 이용하여 채널을 예측하는 Multi-Carrier CDMA BPSK 시스템에서 불완전한 채널 예측과 다중사용자 간섭의 영향을 연구하였다. 더욱이, 라이시안 페이딩 채널의 역방향 링크에서 최대비 합성 공간 다이버시티와 선택 합성 공간 다이버시티 기법을 적용한 성능 개선에 대하여 연구하였다. 수치계산 결과, 파일럿 심볼을 이용하여 채널을 예측하는 Multi-Carrier CDMA BPSK 시스템의 BER 성능은 등가 잡음 대역폭의 분산($\sigma$$^2$$_{c}$)에 매우 민감하나 무선 채널에서의 신호 전력 대 잡음 전력비에는 그리 심하지 않았다. 불완전한 채널 예측에 의한 BER 열화와 파일럿 심볼 간격의 최적화는 라이시안 페이딩 채널에서 Multi-Carrier CDMA BPSK 시스템의 BER 계산을 통하여 얻을 수 있었다. 그리고 불완전한 채널 예측에 의한 BER 열화는 신호 전력 대 잡음 전력비와 채널 예측 필터의 등가 잡음 대역폭에 관계하고 있음을 알 수 있었다.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.5 no.4
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• pp.98-107
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• 1996

In order to predict analytically torque, thrust force, tool life and chip formation in drilling, cutting models for chisel edge with various tool-chip contact length were developed in this type. Also, the experimental tests are run with various pilot holes. The following conclusions were obtained from the analysis. \circled1 It's also found experimentally that thrust force(Fz) decreases as pilot hole diameter increases. \circled2 Surface roughness for material(G) is larger that for material(J). The difference over two materials in roughness value about 0.5$mu extrm{m}$. \circled3 Flank wear of the drill in cutting material of G less than any other kinds of materials(F, G, H, I, J). \circled4 In drilling a deep hole on a workpiece over SM45C either twist drill. The chip was conical helix type at the fist suspensely change the two segment type and than two a long pitch helix style.