• 한국산업정보학회논문지
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• 제20권4호
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• pp.25-37
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• 2015

The early studies indicated that the firm with monopoly power is likely to engage in X-inefficiency such as a managerial slack. The reflection of the X-inefficiency theory has led to the issue that the public sector may be more inefficient than the private sector. In Korea like other many countries the electricity gas water service which can be considered as natural monopoly have been provided mostly by the public sector. In order to provide the empirical evidence to the argument that the public sector may be more inefficient than the private sector this paper estimated the four types of Solow residual which is called the total factor productivity in the electricity gas water service industry with the associated empirical model and compared its productivity with one in the manufacturing industry. The empirical results do not support the argument that the public sector may be more inefficient or less productive than the private sector.

• Bulletin of the Korean Chemical Society
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• 제11권3호
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• pp.214-220
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• 1990

We have studied the Infrared Multiphoton Dissociation (IRMPD) of 1-bromo-3-chloropropane by using the pulsed $CO_2$ laser. The product yields and the HCl/HBr branching ratios in IRMPD of $BrCH_2CH_2CH_2Cl$ are studied under the focused beam geometry as a function of buffer gas (He) pressure, laser energy, and photolysing wavelength. It is observed that the total dissociation yield has a laser energy dependence of 1.8-2.0 power order and the branching ratio is very slightly dependent on the pulse energy for the laser lines employed. The dependences of total dissociation yield and branching ratio on the buffer gas pressures show that the dissociation yield monotonically decreases and the branching ratio slightly decreases with the increase of the buffer gas pressure. The Energy-Grained Master Equation (EGME) was applied to explain the laser pulse energy and the buffer gas pressure(He) dependence of the dissociation yield and the branching ratio.

• 한국대기환경학회지
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• 제23권6호
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• pp.734-743
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• 2007

Polyurethane foam-disk passive air samplers (PAS) were deployed in a southern area of Korea for three months. The target compounds were 12 coplanar polychlorinated biphenyls (PCBs). The congener profiles measured in this study were the same as those in ambient air and emission gas from the incinerator. A gradient of the total PCBs in different regions (industrial>residential>rural) was observed, suggesting the industrial complex may be an important source of coplanar PCBs. In general, only gas-phase compounds are mainly sequestrated by PAS. In order to estimate the concentration of particle-phase PCBs, a gas/particle partition model was used. A combined result (gas+particle-phase PCBs) was compared with previous results, indicating that the level of coplanar PCBs in our study area is comparable to those in other urban sites in the world. The validation of this method for estimating the total concentration is required through additional backup studies.

• 한국약용작물학회지
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• 제9권1호
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• pp.26-32
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• 2001

$10^{\circ}C\;N_2\;gas$ 3시간 처리시 무처리에 비해 총질소, 총아미노산, 비타민 C 함량이 약간 높았고, 탄닌과 엽록소 함량은 낮은 경향이었다. 기능성 성분인 GABA 함량은 무처리 (35mg/100g)에 비해 $51{\sim}205mg/100g$으로 $1.5{\sim}6$배 높았다. 제다 품질은 무처리에 비해 3시간 gas 처리시 차이가 없었다. $20^{\circ}C\;N_2$ gas 3시간 처리가 무처리에 비해 품질관련 성분 중 총질소, 총아미노산(데아닌), 카페인 함량은 많았고, 탄닌과 비타민 C 함량은 약간 낮았다. GABA함량은 무처리 (35mg/100g)에 비해 gas처리가 $85{\sim}225mg/100g$으로 $2.5{\sim}7$배 높았다. 제다 품질은 무처리 80.4점에 비해 gas 처리 $76.3{\sim}78.1$점으로 약간 저하되었다. $30^{\circ}C\;N_2$ 3시간 처리시 무처리와 기호성 관련성분이 거의 차이가 없었고 1, 5시간 처리는 무처리에 비해 품질이 약간 떨어지는 경향이었다. GABA 함량은 무처리 (30mg/100g)에 비해 gas처리가 $115{\sim}217mg/100g$으로 $3{\sim}7$배 증가하였다 제다품질도 무처리 80.4점에 비해 gas 처리가 $74.3{\sim}77.2$점으로 열악하였다. 따라서, $10^{\circ}C$에서는 5시간 gas처리, 20, $30^{\circ}C$에서는 3시간 gas 처리 후 제다를 하는 것이 기호성 및 기능성이 우수한 녹차(GABA차)를 제조할 수 있다고 생각된다.

• 한국가스학회지
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• 제25권1호
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• pp.30-39
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• 2021

세계적으로 천연가스는 환경적, 정치적, 지역적인 이유로 중요한 에너지원으로 부상하고 있다. 우리나라에서 천연가스는 액화천연가스로 수입하고 있으며, 석탄과 원전을 대체하는 연료나 원료의 활용에서 액화천연가스는 증가하고 있다. 우리나라는 천연가스를 수입에 의존하고 있기 때문에 공급에 대한 안정성분석이 중요하다. 따라서, 본 연구에서는 우리나라 수입구조의 위험도 분석을 통하여 공급리스크를 줄이고 안정적인 공급과 수요를 위한 방안을 제시하였다. 공급위험도를 감소시키기 위해 한 국가로부터의 수입 집중도를 낮춰야 하며, 가스공급안정성 지수 (gas supply security index, GSSI)가 낮은 국가의 수입비중을 낮추고 상대적으로 안정적인 국가인 러시아로부터 수입을 증가시켜야 한다. 또한, 수입국가의 수를 늘리거나 안정적 공급이 가능한 국가와의 관계 유지는 우리나라 수입가스의 공급안정성지표 (total gas supply security index, TGSSI)에 긍정적인 영향을 줄 것으로 분석되었다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2005년도 춘계학술대회
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• pp.647-650
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• 2005

Gas hydrates draw great at tent ion recently as a new clean energy resources substituting conventional oil and gas hydrate its presumed huge amount of volume reaching 10 trillion tons of gas and environmentally friendly characteristics. Gas hydrate can contribute to the rapidly increasing consumption of natural gas in Korea and achieve the self support target by 2010 which is $30\%$ of total natural gas demand. This paper shows the importance and benefit of Gas hydrate comparing with new & renewable energy in Korea

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2004년도 제22회 춘계학술대회논문집
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• pp.99-105
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• 2004

The effects of pressure on combustion characteristics of the conical flameholder were investigated experimentally in the pressure range from 0.11 ㎫ to 0.40 ㎫. The result shows that the total equivalence ratio of lean limit becomes lower as the combustor inlet pressure rises and NOx emission is proportional to the pressure to the 0.5th power.

• 천문학회보
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• 제36권1호
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• pp.61.2-61.2
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• 2011

HI gas disks are known to be the largest ISM reservoir in most late type galaxies. When the HI properties of galaxies such as total mass, density, and distribution change, the galaxies may evolve quite differently. In this talk, I will present two groups of galaxies, one undergoing HI stripping and one accreting more gas. I will discuss causes of gas stripping and accretion, and possible consequences in galaxy evolution.

• Nuclear Engineering and Technology
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• 제49권2호
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• pp.450-457
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• 2017

Waste Isolation Pilot Plant repository releases are evaluated through the application of modified parameters to simulate accelerated creep closure, include capillary pressure effects on relative permeability, and increase brine and gas saturation in the operations and experimental (OPS/EXP) areas. The modifications to the repository model result in increased pressures and decreased brine saturations in waste areas and increased pressures and brine saturations in the OPS/EXP areas. Brine flows up the borehole during a hypothetical drilling intrusion are nearly identical and brine flows up the shaft are decreased. The modified parameters essentially halt the flow of gas from the southern waste areas to the northern nonwaste areas, except as transported through the marker beds and anhydrite layers. The combination of slightly increased waste region pressures and very slightly decreased brine saturations result in a modest increase in spallings and no significant effect on direct brine releases, with total releases from the Culebra and cutting and caving releases unaffected. Overall, the effects on total high-probability mean releases from the repository are insignificant, with total low-probability mean releases minimally increased. It is concluded that the modified OPS/EXP area parameters have an insignificant effect on the prediction of total releases.

• Architectural research
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• 제19권4호
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• pp.95-99
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• 2017

Recently, it is becoming increasingly difficult to ignore carbon emission implication of building operations due to the significant rate of energy usage in buildings. In the building sector, our normal expectation implies that large building floor area induces more greenhouse gas (GHG) emission. In this research, the correlation between building total floor areas and GHG emission was explored by simple linear regression and analyzing the yielded residuals for confirming this seemingly obvious conjecture. By looking at the generated regression lines drawn based on the data sets representing public facilities in Ontario, Canada, we were able to confirm that carbon emission rate shows a proportional increase or decrease depending on the total floor area of buildings as has been implied as a conjecture. Some buildings were found to emit significantly large and small amount of GHG, and we addressed potential reasons why those buildings show the deviation from the confirmed proportional interrelation between a building's total floor area and the amount of GHG emission.