• Proceedings of the KIEE Conference
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• 2008.10b
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• pp.127-128
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• 2008

본 연구에서는 비분산 적외선 방식을 이용한 일산화탄소, 이산화탄소 듀얼 센서 모듈을 실현한다. 비분산 적외건 방식은 가스분자가 특정 파장의 적외선을 흡수하는 특성을 이용하여 가스의 적외선 흡수도를 측정하여 농도로 환산하는 방식이다. 비분산 적외선 방식은 수명이 길고 정밀도가 높아 기존의 접촉식(화학식) 센서에 비해 우수한 특성을 가지고 있다. 중요한 기술은 NDIR의 핵심부분인 광 공동의 설계 기술과 센서의 성능을 최종 결정짓는 농도-온도 교정 기술이다. 현재까지 개발된 광공동 기술은 $CO_2$ 센서의 단일 센서 방식이었다. 본 연구에서는 이 기술을 접목한 일산화탄소까지 동시에 측정할 수 있는 광 공동기술과 교정기술을 연구개발하여 하나의 광 공동으로 이산화탄소와 일산화탄소를 동시에 측정 할 수 있는 고기능 센서를 실현하는 것이다.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2005.06a
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• pp.274-280
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• 2005

The system parameters of gas turbine engine tend to change remarkably in real operating condition. It means that operators have to consider environment and suitably control fuel flow. The conventional PID controller, however, can not guarantee good control performance in the aspect of system parameter change. This paper, therefore, proposes a scheme for integrating PID control and fuzzy technique to obtain the good performance of gas turbine engine speed control on the whole operating range. The effectiveness of the proposed fuzzy PID controller is verified through computer simulation.

• 한국신재생에너지학회:학술대회논문집
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• 2008.10a
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• pp.196-199
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• 2008

In this study, gas hydrate production has been followed using swapping method to investigate the effect of injection rate of flue gas and soaking period in unconsolidated artificial sand sample. The results shows that recovery factor of methane gas decreases with increasing the injection rate of flue gas. This indicates that the velocity of flue gas in porous media may act as kinds of inhibitor for production of hydrate. Also recovery factor increases with increasing the soaking time.

• Journal of the Korean Chemical Society
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• v.19 no.3
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• pp.193-197
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• 1975

In the combustion process, it is found that the addition of small amount of hydroxide of alkali and alkaline earth metal to the anthracite is more effective in order to suppress the evolution of $SO_2 gas, since the large portion of sulfur contained in anthracite is remained in the ash with a form of sulfide and sulfate. Under this experimental condition, however, it was observed that the SO_2$ gas corresponding to about 20 % of sulfur content in anthracite was released at $1000^{\circ}C$.

• Proceedings of the KSME Conference
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• 2008.11b
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• pp.2984-2988
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• 2008

Numerical analyses are carried out in order to understand complex thermal characteristics of a gas turbine combustor liner such as combustion gas temperatures, wall temperatures and heat transfer distributions. As results, The maximum internal and external heat transfer is $2218W/m^2K$ and $2358W/m^2K$, respectively. The combustion gas temperatures range is 673K to 1760K. A range of temperature on TBC is 676K to 1382K. Lastly, temperature range on outer surface of combustion liner cooled by compressed air is 676K to 1188K.

• Journal of the Korean Institute of Gas
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• v.14 no.1
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• pp.28-36
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• 2010

We have garnered 3,593 data of gas accidents reported for 12 years from 1995, and then analyzed the LPG vaporizer accidents according to their types and causes based on the classified database. According to the results the gas rupture has been the most common accident followed by the release, explosion and then fire accidents, the most frequent accident-occurring sub-cause is LPG check floater faults. In addition, we have applied the Poisson Probability Functions to predict the most-likely probabilities of fire, explosion, release and rupture with the LPG vaporizer in the upcoming 5 years. In compliance with Poisson Probability Functions results, in the item which occurs below 3 "LPG-Vaporizer-Fire", in the item which occurs below 5 "LPG-Vaporizer-Products Faults-Check Floater" and the item which occurs below 10 appeared with "LPG-Vaporizer-Products Faults". From this research we have assured the successive database updating will highly improve the anticipating probability accuracy and thus it will play a key role as a significant safety- securing guideline against the gas disasters.

• Journal of Energy Engineering
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• v.22 no.2
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• pp.156-168
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• 2013

Drilling expedition #1 in 2007 and drilling expedition #2 in 2010 were performed for gas hydrate resources evaluation and optimal site selection of pilot test in Ulleung basin, East Sea, Korea. This study presents to build the 3D spatial distribution models using the estimated sedimentary facies, porosity, and gas hydrate saturation derived by well logs and core analysis data from UBGH1-4, UBGH1-9, UBGH1-10, UBGH1-14, UBGH2-2-1, UBGH2-2-2, UBGH2-6, UBGH2-9, UBGH2-10 and UBGH2-11. The objective of 3D spatial distribution modeling is to build a geological representation of the gas hydrate-bearing sediment that honors the heterogeneity in 3D grid scale. The facies modeling is populating sedimentary facies into a geological grid using sequential indicator simulation. The porosity and gas hydrate saturation modeling used sequential Gaussian simulation to populate properties stochastically into grid cells.

• Journal of the Korean Applied Science and Technology
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• v.36 no.4
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• pp.1427-1433
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• 2019

In this paper, Gas engine was tested for the energy of synthesis gas. As excess air ratio increase 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6 in 1800 rpm and synthesis gas, thermal efficiency generally decrease and power generation was 34 kWm at λ 1.4. And excess air ratio increase 1, 1.1, 1.2, 1.3, 1.4 in power generation 34 kWm, thermal efficiency generally increase 34.2%, 36.9%, 37.2%, 37.4%, 38.1%. Total efficiency through power generation consumes 38.7 kg/h of fuel at 30 kWe load and recovers 57.3% of waste heat by recovering 57.3 kW of waste heat through 32.1% power generation efficiency and heat recovery from cooling water and exhaust gas. The total efficiency was 85.8%.

• Journal of the Korean Society for Precision Engineering
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• v.26 no.3
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• pp.7-10
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• 2009

• Journal of the Korean Vacuum Society
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• v.3 no.4
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• pp.389-394
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• 1994

설계변경된 sector 챔버를 제작하고 저장링 챔버로서 성능을 알기 위하여 각종 진공실험을 하였 다. 가스방출률은 낮은 10-13 Torr.1/sec/cm2 이고 누설률은 1-10-10 Torr.1/sec 이하이며 2회 ba-keout과 NEG활성화후 얻어진 최종진공도는 낮은 10-11 Torr이었다.이러한 결과는 저장링 sector 챔버으 진공요 구조건을 충분히 만족시킨다.