• Korean Chemical Engineering Research
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• v.62 no.1
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• pp.70-79
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• 2024

Raman analyzer is an analytical technique that utilizes the "Raman effect", which occurs when light is scattered by the inherent vibrations of molecules. It is used for molecular identification and composition analysis. In the natural gas industry, it is widely used in bunkering and tank lorry fields in addition to LNG export and import terminals. In this study, a LNG-specific Raman analyzer was installed and operated under actual field conditions to analyze the composition and principal properties (calorific value, reference density, etc.) of LNG. The measured LNG composition and calorific value were compared with those obtained by conventional gas chromatograph that are currently in operation and validated. The test results showed that the Raman analyzer provided rapid and stable measurements of LNG composition and calorific value. When comparing the calorific value, which serves as the basis for LNG transactions, with the results from conventional gas chromatograph, the Raman analyzer met the acceptable error criteria. Furthermore, the measurement results obtained in this study satisfied the accuracy criteria of relevant international standards (ASTM D7940-14) and demonstrated similar outcomes compared to large-scale international demonstration cases.

• 월간 기계설비
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• s.41
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• pp.64-79
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• 1993

본 논문에서는 도시공해 방지를 위해 도시가스를 연료로 사용하는 경우 거주자의 생활수준이나 단지의 밀도 및 난방부하 설정등에 다소 차이는 있으나 소규모 고층 아파트(공동주택)의 난방방식중 중앙난방 방식과 개별난방 방식의 초기시설비, 연료비, 시설관리비의 경제성을 검토하고 난방 시스템의 지침을 제시하였다. 전체 공사비(초기투자비)는 개별난방 방식이 중앙난방 방식보다 약 2$\%$정도 절감되었다. 난방비와 시설관리에 따른 인건비 면에서도 난방의 경우 개별난방 방식이 중앙난방 방식에 비하여 난방과 하절기 온수만을 별도로 사용하는 경우 개별난방 방식이 중앙난방 방식보다 난방비가 9$\%$정도 더 들었으며, 시설관리 인건비 면에서는 중앙난방 방식보다 개별난방 방식이 66.7$\%$ 적게 들었다. 전체적으로 중앙난방 방식보다 개별난방 방식이 초기투자비 및 유지관리 면에서 경제성이 우수함이 확인되었다.

• 한국신재생에너지학회:학술대회논문집
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• 2005.06a
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• pp.374-377
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• 2005

Hyundai motor company has designed a above 50kW-class PEMFC stack for Fuelcell vehicle based on SUV. Hyundai increased the power density of the stack through the optimized flowfield of bipolar plate, manifold structure, and improvement of sealing, etc. Also, Gas to Gas humidifier was adopted in fuelcell system to reduce the system humidification load, it had been proven by short stack test. Components of stack, bilpolar plate, manifold, were analyzed through the computer simulation, so temperature and pressure distribution in the components and system were improved. This stack tested in Bread Board which was organized similar to real vehicle system.

• Korean Journal of Materials Research
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• v.7 no.10
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• pp.851-855
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• 1997

본 실험에서는 저유전율 층간절연물질로서 SiOF박막을 ECR plasma CVD를 이용하여 증착하였다. 또한 증착시에 발생시킨 플라즈마의 특성 분석을 위하여 Langmuir probe를 반응챔버에 부착하여 플라즈마 밀도, 마이크로파 전력은 700W, 기판온도는 30$0^{\circ}C$에서 행하였다. 증착된 SiOF 박막을 분석한 결과, 가스유량비(SiF$_{4}$/O$_{2}$)가 0.2에서 1.6으로 증가하였을 때 불소의 함량은 약 5.3at%에서 14.5at%로 증가하였으며, 굴절률은 1.501에서 1.391로 감소하였고 이는 불소 첨가에 의한 박막의 밀도감소에 의한 것으로 생각된다. 또한 박막의 유전상수는 가스유량비가 1.0(11.8qt.% F함유)일 때 3.14였다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2010.06a
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• pp.340-340
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• 2010

본 연구에서는 유도결합형 플라즈마(ICP)를 이용하여, HBr/Ar 가스의 조성비 변화에 따른 Pb(Zr,Ti)$O_3$ 박막에 대한 식각특성을 연구 하였다. PZT박막의 식각속도와 Oxide($SiO_2$), Photo resister(PR)에 대한 식각선택비를 추출하였으며, 식각 메카니즘을 규명하기 위하여 optical emission spectroscopy(OES)와 double Langmuir prove(DLP) 이용하여 라디칼 특성변화와 이온 전류밀도(Ion current density)를 측정하였다.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.02a
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• pp.518-518
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• 2013

자외선이 생체를 파괴하거나 탄생시킬 수 있는 중요한 요소라는 것은 잘 알려져있다. 이 때문에 생체 시료를 보통 자외선 파장대인 250~350 nm보다 짧은 10 nm 영역에 있는 극자외선에 노출되었을 때 그 상호작용 및 변화를 찾아서 분석하는 것을 목표로 삼는다. 먼저 이에 대한 기초내용으로, 앞으로 활용하게 될 플라즈마 집속장치에서의 전극형태에 따른 EUV 광원의 특성을 알아보는 실험을 진행하였다. 이 실험은 집속 플라즈마 발진장치의 2가지 전극인 마테르 (Mather) 형태의 전극과, 초사이클로이달 핀치(Hypercycloidal pinch) 핀치 형태의 전극에서 발진된 극자외선(Extreme Ultraviolet : EUV) 집속 플라즈마의 전자온도와, 전자밀도, power를 분석하였다. 그리고 EUV 광원 발생장치에 Ar 가스와, Ne-Xe 가스내 환경에서 2 종류의 전극에 의해 만들어진 고밀도 플라즈마로부터 발생된 EUV의 특성을 알아보았다.

• Journal of Institute of Convergence Technology
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• v.3 no.2
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• pp.57-60
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• 2013

The purpose of this study is to analysis of how to calculate fuel efficiency in major development countries (U.S. and Europe) and energy consumption formular derivation of domestic CNG fuel and prove by vehicle test. The formula of fuel consumption is different in mpg(mile per gallon), l/100km, and km/l each countries. CNG fuel has a significant impact on fuel density, composition, and Hydro-Carbon ratio. So, this study how to measurement and calculation procedures of CNG gaseous fueled vehicle energy consumption rate.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2021.11a
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• pp.120-121
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• 2021

This study examines the performance of the pre-treatment process system to use CGS, a by-product generated in IGCC, as a concrete fine aggregate for construction materials, on the quality of CGS fine aggregate. As a result of the analysis, it is judged that the quality of fine aggregates of CGS can be improved at both density, absorption rate, and 0.08mm body passage amount after the hydroelectric screening process using water as a medium during the pretreatment process. It is believed that it can be used as basic data for national standard certification of CGS fine aggregates in the future.

• Journal of the Korean Institute of Gas
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• v.10 no.4 s.33
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• pp.6-10
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• 2006

In this study, gross heating value(GHV), density, vapor pressure and heat capacity of natural gas were estimated and their experimental data were compared with calculated ones, SRK method. A new alpha function was used to predict the vapor pressures of pure component of the natural gas constituents well instead of calculating vapor pressures with acentric factors. And binary adjustable parameters were determined by regressing binary vapor-liquid equilibria data. Through this study, our results showed good agreements with experimental data.

• Applied Chemistry for Engineering
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• v.20 no.2
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• pp.117-125
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• 2009

In order to utilize natural gas (NG), one of the clean energy sources in next-generation, as a fuel for vehicles, it is important to store natural gas with high density. To store NG by adsorption (ANG) at room temperature and at relatively low pressure(35~40 atm) is safe and economical compared with compressed NG and liquefied NG. However, so far no adsorbent is reported to have adsorption capacity suitable for commercial applications. Nanoporous materials including metal-organic frameworks can be potential adsorbents for ANG. In this review, physicochemical properties of adsorbents necessary for high adsorption capacity are summarized. Wide surface area, large micropore volume, suitable pore size and high density are necessary for high energy density. Moreover, low adsorption-desorption energy, rapid adsorption-desorption kinetics and high delivery are needed. Recently, various efforts have been reported to utilize nanoporous materials in ANG, and it is expected to develop a nanoporous material suitable for ANG.