• Journal of Dental Anesthesia and Pain Medicine
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• 제20권4호
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• pp.261-262
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• 2020

• 대한치과의사협회지
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• 제51권7호
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• pp.382-388
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• 2013

Inhalation sedation has may advantageous properties that make it a suitable choice for sedation in pediatric, disabled and many patients, either alone or in conjunction with other agents. We need review of Guideline on use of nitrous oxide for dental patients that make minimizing complication of sedation for safe and effective sedation. Conventionally, nitric oxide is used for inhalation sedation, nowadays sevoflurane can also be used due to easily titratable for controllable effect and less failure of sedation. Recently sevoflurane can be used to provide sedation as a sole agent in air or oxygen or in combination with nitrous oxide in dentistry.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2017년도 제48회 춘계학술대회논문집
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• pp.1061-1067
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• 2017

1960년대 이후부터 하이드라진($N_2H_4$)은 로켓, 인공위성 또는 심우주 임무용 추진제로 사용되어 왔다. 하지만 하이드라진의 높은 독성과 운영비용으로 이온성 액체 추진제(ADM, HAN) 및 아산화질소 연료 혼합물(NOFB)과 같은 친환경 추진제에 대한 요구가 증가하고 있다. 아산화질소 연료 혼합물(NOFB)은 이원추진제가 갖는 높은 성능과 단일추진제의 단순한 공급시스템 장점을 모두 갖는 추진제로서, 적절한 취급방법과 설계가 적용된다면 전통적인 하이드라진 추진 시스템을 대체할 만한 추진제로 사용가능할 것이다.

• 한국초지조사료학회지
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• 제40권4호
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• pp.274-278
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• 2020

Pig slurry (PS) is the most applicable recycling option as an alternative organic fertilizer. The application of pig slurry has the risk of air pollution via atmospheric ammonia (NH3) and nitrous oxide (N2O) emission. The zeolite has a porous structure that can accommodate a wide variety of cations, thus utilizing for the potential additive of deodorization and gas adsorption. This study aimed to investigate the possible roles of zeolite in mitigating NH3 and N2O emission from the pig slurry applied to the maize cropping. The experiment was composed of three treatments: 1) non-N fertilized control, 2) pig slurry (PS) and 3) pig slurry mixed with natural zeolite (PZ). Both of NH3 and N2O emission from applied pig slurry highly increased by more than 3-fold compared to non-N fertilized control. The NH3 emission from the pig slurry was dominant during early 14 days after application and 20.1% of reduction by zeolite application was estimated in this period. Total NH3 emission through whole period of measurement was 0.31, 1.33, and 1.14 kg ha-1. Nitrous oxide emission in the plot applied with pig slurry was also reduced by zeolite treatment by 16.3%. Significant increases in forage and ear yield, as well as nutrient values were obtained by pig slurry application, while no significant effects of zeolite were observed. These results indicate that the application of zeolite and pig slurry efficiently reduces the emission of ammonia and nitrous oxide without negative effects on maize crop production.

• Environmental Sciences Bulletin of The Korean Environmental Sciences Society
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• 제3권2호
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• pp.137-142
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• 1999

One of the most important parameters required to model the absorption of CO2 into aqueous alkanolamine solutions is physical solubility. However, since CO2 reacts in amine solutions, its physical solubility cannot be measured directly. As a result, a nonreacting gas which is similar to CO2 has to be used such as N2O. The solubility of nitrous oxide (N2O) in aqueous solutions of 0wt%-50wt% MDEA, 0wt%-30wt% DEA, and 50wt % total amine with DEA/MDEA molar ratios of 0.05, 0.25, 0.5 and 0.67 was measured using a modified Zipperclave reactor over a temperature range of 293-353 K with near atmospheric partial pressures of N2O. the solubility data from this work were K with near atmospheric partial pressures of N2O. The solubility data from this work were found to be in good agreement with previously reported data where available.

• Journal of Dental Anesthesia and Pain Medicine
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• 제18권2호
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• pp.71-78
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• 2018

The first clinical application of nitrous oxide ($N_2O$) was in 1844, by an American dentist named Horace Wells who used it to control pain during tooth extraction. Since then, $N_2O$ has shared a 170-year history with modern dental anesthesia. $N_2O$, an odorless and colorless gas, is very appealing as a sedative owing to its anxiolytic, analgesic, and amnestic properties, rapid onset and recovery, and, in particular, needle-free application. Numerous studies have reported that $N_2O$ can be used safely and effectively as a procedural sedation and analgesia (PSA) agent. However, $N_2O$ can lead to the irreversible inactivation of vitamin B12, which is essential for humans; although rare, this can be fatal in some patients.

• 한국초전도ㆍ저온공학회논문지
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• 제9권4호
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• pp.46-49
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• 2007

This paper describes the sensitive cooling performance change of J-T refrigerator for cryosurgical probe due to its working fluid. The analytical results of using 50 bar nitrous oxide are compared with the case of 300 bar argon. Bio-heat equation is numerically solved to investigate the effect of the probe temperature and the cooling power of the J-T refrigerator. The refrigerator using 50 bar nitrous oxide has larger cooling power above 185 K than the one with 300 bar argon, which enables fast cooling at early stage of cryosurgery, but the biological tissue away from the probe tends to be cooled slowly after the probe reaches its lowest operating temperature. When the repeated freeze-thaw cycle is employed for main tissue destruction mechanism, using high pressure nitrous oxide is more advantageous than argon if the freezing operation is within 2-3 minutes. The probe with high pressure argon is more suitable for the case of longer freeze-thaw cycle with fewer repetitions.

• 대한치과마취과학회지
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• 제12권2호
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• pp.69-74
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• 2012

Background: The purpose of this study is to investigate the efficacy and safety of the sedation technique for implant surgery by combining the use of inhalation of nitrous oxide/oxygen with intravenous midazolam. Methods: Patients requiring surgery for the placement of dental implants were randomly allocated to two groups receiving intravenous midazolam or a combined technique using nitrous oxide/oxide and intravenous midazolam. Safety parameters, cooperation scores, anxiety scales, total amount of midazolam administered and recovery time were recorded and compared. Results: There were a statistically significant reduction in the amount of midazolam required to achieve optimal sedation (P<0.01), an overall significant reduction in recovery time (P<0.01), a significant reduction in anxiety scales (P<0.05), and a significant improvement in cooperation (P<0.05) and peripheral oxygen saturation (P<0.05) when a combined technique of inhalational $N_2O/O_2$ and midazolam was used. Conclusions: For implant surgery, this combining sedation technique could be safe and reliable, demonstrating reduction of total dose of midazolam and level of patient's anxiety and improvement in patient's recovery and cooperation.

• 한국미생물·생명공학회지
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• 제47권4호
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• pp.630-638
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• 2019

아산화질소는 이산화탄소보다 약 310배 높은 지구온난화 지수를 갖는 주요 온실가스이다. 본 연구에서는 아산화질소 배출저감을 위해 고도처리슬러지를 접종원으로 이용하여 아산화질소 환원 컨소시움을 확보하였다. 이 컨소시움의 우점종은 Sulfurovum (17.95%), Geobacter (14.63%), Rectinema(11.45%)와 Chlorobium (8.24%)이었다. 아산화질소 환원 컨소시움의 활성에 미치는 C/N 비(mol·mol-1), 탄소원의 영향을 조사한 결과, C/N 비 6.3 및 아세트산을 탄소원으로 공급한 조건에서 최대 아산화질소 환원 활성을 나타냈다. 또한, 본 컨소시움의 3,000 ppm 이하의 아산화질소 농도 범위에서 아산화질소 농도가 증가할수록 환원속도도 증가하였다. 속도론적 해석 결과, 아산화질소 환원 컨소시움의 최대 아산화질소 환원 속도는 163.9 ㎍-N·g VSS^-1·h^-1이었다. 본 Consortium은 아산화질소를 N2로 환원하는데 관여를 nosZ 뿐만 아니라, 질산염을 아질산염으로 환원하는 narG, 아질산염을 일산화질소로 환원하는 nirK 유전자 및 일산화질소를 아산화질소를 환원하는 norB 유전자를 모두 보유하고 있었다. 이는 본 컨소시움은 아산화질소 제거 공정 뿐 만 아니라, 탈질공정에도 활용 가능한 유용한 미생물 자원임을 의미한다.

• 월간산업보건
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• 통권221호
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• pp.9-11
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• 2006