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생물학적 질소 제거공정에서 ORP 측정을 통한 외부탄소원의 자동 주입 제어
신춘환 ( Choon Hwan Shin ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.3
For the cost-effective biological nitrogen removal (BNR) process whose characteristics of influent have low COD/N ratios, the automatic control system for the addition of external carbon based on oxidation-reduction potential (ORP) data in an anoxic reactor has been developed. In this study, it was carried out with a pilot-scale Bardenpho process which was consisted of anoxic 1, aerobic 1, aerobic 2, anoxic 2, aerobic 3 tank and clarifier. Firstly, the correlation coefficient (R2) of the dosage of external carbon source and ORP value was about 0.97. Consequently, the automatic control system using ORP showed that the dosage of external carbon source was decreased by about 20% compared with a stable dosage of 75 mg/L based on the COD/N ratio of the anoxic influent.
Il, Ryoung Sohn,Toshio, Narita 한국부식방식학회 2002 Corrosion Science and Technology Vol.31 No.1
Fe-25Cr alloy was pre-treated in Ar or N₂-0.1%SO₂at 973K, and then extemal stresses were applied in the N₂-0.1%SO₂at 973K. By the pre-treahnent, 1μm thickness scale which consist of a mixture of oxides and sulfides of Cr and/or Fe were formed. With applying stress of l5MPa there was little strain for 36ks, although the scale grew somewhat and an Fe oxide formed at the metallscale mterface. At high stresses, 25 and 30MPa, the scale cracked due to plastic strain between 0.9% and 3.5%. and corrosion progressed very rapidly. In case of the Ar pre-treatment a thin Cr₂0₃with 0.1μm formed on the Fe-25Cr. With applying stress the scale cracked, but corrosion was limited within the cracks. The thin Cr₂0₃scale seems to be very etyective on corrosion resistance of the Fe-25Cr under extemal loading, and it was also resistive against the creep deformation.
The Disturbance Rejection Design Based on Physical Feedforward for Solid Oxide Fuel Cell
Zhenlong Wu,Wangying Shi,Donghai Li,Ting He,Yali Xue,Minfang Han,Song Zheng 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10
The output voltage control of the Solid Oxide Fuel Cell (SOFC) is challenging due to the strong nonlinearity, modelling uncertainty, the dramatic change of the external current load and constraints on the amplitudes and change rates of the actuator. Besides, the desired range of the fuel utilization is another difficult for the control strategy. In this paper, Active disturbance rejection control (ADRC) is proposed to handle the nonlinearity, uncertainty and the external disturbance, and physical feedforward is designed to speed up the response of the whole system and keep the fuel utilization in the desired range. Instead of the SOFC model, the design of physical feedforward is based on the definition of fuel utilization which is featured by simplicity, generality and effectiveness. Simulation results show that the proposed control strategy has smaller variation range of the fuel utilization, shorter time of the changing process of the output voltage and better robustness than others control strategies.
Seyed Kazem Shakouri,Zeynab Razavi,Fariba Eslamian,Homayoun Sadeghi-Bazargani,Samad Ghaffari,Arash Babaei-Ghazani 대한재활의학회 2015 Annals of Rehabilitation Medicine Vol.39 No.2
Objective To investigate the effect of enhanced external counterpulsation (EECP) on plasma nitric oxide (NO), Endothelin 1 (ET1), high sensitive C-reactive protein (HSCRP) and quality of life (QoL) in patients with coronary artery disease (CAD).Methods We conducted a pilot randomized clinical trial in order to evaluate plasma NO, ET1, HSCRP and QoL before and after twenty sessions of EECP (group A) and cardiac rehabilitation (CR, group B) in 42 patients with CAD (21 in each group).Results Forty-two patients (33 male and 9 female) were included in the study. The mean age was 58.2±10 years. The mean HSCRP was 1.52±0.7 in the EECP group and it was reduced to 1.27±0.4 after intervention. The reduction in HSCRP was not statistically significant in EECP and CR groups with p=0.33 and p=0.27, respectively. There was not significant improvement of NO, ET1, and QoL in the EECP and CR groups shortly after therapy (p>0.05).Conclusion Although the short-term EECP treatment in CAD patients improved HSCRP, NO, ET1, and QoL compared with the baseline those improvements are not statistically significant. Further studies are necessary with large study groups and more sessions.
An Experimental Study of the Anti-oxidant and the Anti-inflammatory Effects of Alum and Burnt Alum
서형식 대한약침학회 2012 Journal of pharmacopuncture Vol.15 No.2
Objectives: The purpose of this study was to compare the antioxidant and anti-inflammatory effects of Alum (AL) and Burnt Alum (BAL), which are commonly used as external ointments. Methods: Extracts of AL and BAL were classified into three groups: 20, 50, and 100 ㎎/㎕. The cytotoxicity was measured by using MTT assays in human keratinocyte cell line (HaCaT). The anti-oxidant effect was measured by using the DPPH (1,1-diphenyl-2-picryl-hydrazyl-hydrate) radical scavenger. The anti-inflammatory effect was measured by using the inhibitory efficacy for the amount of nitric-oxide (NO) produced in mouse macrophage cell line (RAW 264.7). Results: BAL showed a higher level of cytotoxicity than AL. The AL groups showed a concentration-dependent scavenging effect on DPPH radicals, but no significant relevance was found. The BAL groups showed a concentration-dependent scavenging effect on DPPH radicals. The scavenging effects of the BAL groups were almost insignificant, but the values for the 20, 50, and 100 ㎍/㎖ trials were different. The BAL groups showed significant concentration-dependent inhibitory effects on NO production, but the AL groups did not. Conclusions: AL showed an anti-oxidant effect more efficiently than BAL did, which demonstrated a superior anti-inflammatory effect. Therefore, for external usage, AL must be distinguished from BAL.
An Experimental Study of the Anti-oxidant and the Anti-inflammatory Effects of Alum and Burnt Alum
Seo, Hyung-Sik KOREAN PHARMACOPUNCTURE INSTITUTE 2012 Journal of pharmacopuncture Vol.15 No.2
Objectives: The purpose of this study was to compare the antioxidant and anti-inflammatory effects of Alum (AL) and Burnt Alum (BAL), which are commonly used as external ointments. Methods: Extracts of AL and BAL were classified into three groups: 20, 50, and $100mg/{\mu}{\ell}$. The cytotoxicity was measured by using MTT assays in human keratinocyte cell line (HaCaT). The anti-oxidant effect was measured by using the DPPH (1, 1-diphenyl-2-picryl-hydrazyl-hydrate) radical scavenger. The anti-inflammatory effect was measured by using the inhibitory efficacy for the amount of nitric-oxide (NO) produced in mouse macrophage cell line (RAW 264.7). Results: BAL showed a higher level of cytotoxicity than AL. The AL groups showed a concentration-dependent scavenging effect on DPPH radicals, but no significant relevance was found. The BAL groups showed a concentration-dependent scavenging effect on DPPH radicals. The scavenging effects of the BAL groups were almost insignificant, but the values for the 20, 50, and $100{\mu}g/m{\ell}$ trials were different. The BAL groups showed significant concentration-dependent inhibitory effects on NO production, but the AL groups did not. Conclusions: AL showed an anti-oxidant effect more efficiently than BAL did, which demonstrated a superior anti-inflammatory effect. Therefore, for external usage, AL must be distinguished from BAL.
Hazardous Waste Destruction and Nitric Oxide Reduction with Externally Forced Oscillation
전영남,신대윤 한국화학공학회 2004 Korean Journal of Chemical Engineering Vol.21 No.4
The research described here focuses on the enhancement of hazardous waste destruction and the reductionin nitric oxide and unburned emissions in a cavity incinerator, which has externaly forced acoustic oscillation. Thespecific configuration of the incinerator was manufactured to consist of two opposing jets and a rearward facing step[Chun, 1999]. The cavity-type incinerator warrants a suficient residence time and effective turbulent mixing by theformation of a strong recirculation region in a combustion cavity. The experiments were carried out about combustioncharacteristics in a 3.2 kW laboratory scale, transportable, cavity incinerator without external oscillation. These showedthat hazardous waste was destructed effectively, but unfortunately NO was increased by high gas temperature. To solvethis problem, we developed an externaly oscilated auxiliary burner embedded on the incinerator furnace. The externaloscilation was effective to reduce NO which is produced at high temperature incineration and to destruct hazardouswaste, simultaneously. Emissions of NO are seen to be decreased by nearly 60%, and DRE (destruction and removalefficiency) is above 99.99%, all with external forcing at a specific optimum conditions.