• 대한기계학회논문집B
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• 제36권7호
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• pp.767-774
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• 2012

신형경수로인 APR1400의 안전주입탱크에는 유량조절장치가 설치되어있다. 이러한 유량조절장치는 안전주입탱크 내부의 수위에 따라 유량조절장치 내부에 위치한 와류실의 유동양식이 변하도록 설계되어 있어, 피동적으로 유량이 조절되는 특성을 가지고 있다. 그러나 고유량에서 저유량으로 전환되는 과정에서 유동의 관성에 의해 상부 기체가 방출되는 현상이 존재하여, FD 성능에 영향을 줄 수 있다. 본 논문에서는 전산유체역학 코드인 CFX 코드를 활용하여 안전주입탱크의 유량전환현상시 기체의 방출현상에 대해 이상유체 자유수면모델 적용하여 계산하였다. 이를 통해 안전주입수의 수위 및 상부 충전기체의 거동을 평가하여 FD 성능특성에 미치는 영향을 분석하였다. 그 결과, 유량전환구간에서 자유수면의 높이가 순간적으로 낮아지게 되어, 상부의 기체가 일부 방출되는 것으로 평가되었으나, FD 성능특성에는 큰 영향을 미치지 않는 것으로 평가되었다.

• 동의생리병리학회지
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• 제17권3호
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• pp.648-655
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• 2003

In this study, the effects of Gamgung-tang gamibang on the hyperthyroidism induced by the intraperitoneal injection of 3,5,3-triiodothyronine was examined by the measurement of physical changes, body weight, the volume of food intake and rectal temperature, and heart weight, heart beat, blood pressure with contrast to propranolol, one of beta-blocking agents. the obtained results were as follows. The Gamgung-tang gamibang extract showed to inhibit the decrease of body weight and rectal temperature, and decrease the food intake, so the inhibitory effects of Gamgung-tang gamibang extract on the experimental hyperthyroidism were exhibited. The Gamgung-tang gamibang extract showed the inhibitory effects on the circulatory functions changed and enhanced by the experimental induced hyperthyroidism, the action of Gamgung-tang gamibang extract was less effective than the propranolol of D-CONT group. The Gamgung-tang gamibang extract showed significant effects to inhibit the concentration of serum thyroid houmone, more effective than the propranolol, beta-blocking agents. The Gamgung-tang gamibang extract showed the effective inhibitory reaction on the biochemical changes in serum, cholesterol, ketone bodies, free fatty acid, glucose in hyperthyroid rats induced by 3,5,3-triiodothyronine.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.764-767
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• 2003

The characteristics of diesel spray have much effect on the engine performances such as power. fuel consumption rate and emissions. Therefore, the measurement of fuel spray characteristics is very important for the improvement of heat engine. The factors which control diesel spray characteristics are injection pressure, ambient temperature and density etc. Spray behaviors are visualized by using the high speed video camera and spray angle, spray penetration are measured. Experimental equations of spray penetration and spray angle were derived by using the experimental results. 1) Ambient temperature and density influence on the characteristics of diesel spray. 2) Experimental equation of spray penetration is expressed as follows 0＜t＜ $t_{b}$ ; $S_1$=11.628$\Delta$ $P^{0.485}$ $\rho$$_{a}$ $^{-0.478}$ $t^{1.337}$, $t_{b}$ ＜t; $S_2$=7.457$\Delta$ $P^{0.523}$ $\rho$$_{a}$ $^{-0.382}$ $t^{0.548}$ 3) Experimental equation of spray Angie is expressed as follows $T_{a}$ =293K; Tan($\theta$/2)=059($\rho$$_{a}$ / $\rho$$_{f}$ )$^{0.437}$, $T_{a}$ =473K; Tan($\theta$/2)=0588($\rho$$_{a}$ / $\rho$$_{f}$ )$^{0.404}$_{f}$ )$^{0.404}$

• Journal of Advanced Marine Engineering and Technology
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• 제32권5호
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• pp.707-716
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• 2008

The objective of this study was to analyze the effect of mixed fuel composition and mass fraction on spray inner structure in evaporating transient spray under the variant ambient conditions. Spray structure and spatial distribution of liquid phase concentration were investigated using a thin laser sheet illumination technique on the three component mixed fuels. A pulsed Nd:YAG laser was used as a light source. The experiments were conducted in a constant volume vessel with optical access. Fuel was injected into the vessel with electronically controlled common rail injector. Used fuel contains i-octane($C_8H_{18}$), n-dodecane($C_{12}H_{26}$) and n-hexadecane($C_{16}H_{34}$) that were selected as low-, middle- and high-boiling point fuel, respectively. Experimental conditions are 42 MPa, 72 MPa and 112 MPa in injection pressure, $5\;kg/m^3$, $15kg/m^3$ and $30kg/m^3$ in ambient gas density, 300 K, 500 K, 600 K and 700 K in ambient gas temperature, 300 K and 368 K in fuel temperature and different fuel mass fraction. Experimental results indicated that the multi-component fuels made two phase region mixed vapor and liquid so that it would are helpful to improve combustion, for the fuels of high boiling point component could accelerate evaporation very much according as low boiling point fuel was added to high boiling point fuel.

• 대한기계학회논문집B
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• 제36권5호
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• pp.495-501
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• 2012

연소실 내의 주류 공기유동에 미치는 영향을 최소화하면서 미립화 및 혼합특성을 향상시키기 위한 방법으로 주류공기 유동에 대해 수직방향의 연료분사 방식이 실용 엔진에서 많이 사용되고 있고, 관련 연구도 활발히 보고되고 있다. 본 연구는 가스터빈이나 램젯 엔진에서 사용되고 있는 수직분사의 분무특성은 실험적으로 조사하고, 단일 및 이중 수직분사에 따른 침투길이를 측정함으로써 선행연구에 의해 보고된 결과와 비교하였다. 또한 압력과 모멘텀 플럭스비 변화에 따른 침투길이, 분무입경 등의 분무 특성을 연구하였다. 특히, 이중 수직분사의 침투길이는 단일 수직분사의 침투길이에 비해 전단의 수직분사의 영향으로 후단의 수직분사 길이가 약 20% ($L_h$=4mm) 증가함을 확인할 수 있었다.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2007년도 제29회 추계학술대회논문집
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• pp.125-130
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• 2007

추력 30톤급 액체로켓엔진의 실물형 연소기에 케로신을 이용한 재생냉각 방식을 적용하여 연소시험을 수행하였다. 30톤급 실물형 연소기로는 처음으로 연소기 헤드와 연소실이 일체형으로 제작되었으며, 연소성능 및 재생냉각 성능, 그리고 연소기 내구성 확인을 위하여 여러 차례 연소시험이 수행되었다. 본 논문에서는 연소압력 68 bar 혼합비 2.8의 탈설계점 조건과 연소압력 60 bar, 혼합비 2.5의 설계점 조건을 적용한 연소시험의 성능결과에 대하여 기술하였다. 각각의 연소시험 결과 연소성능 및 연소안정성, 그리고 연소기 내구성 측면에서 충분히 성공적인 데이터를 얻었으며, 이로써 30톤급 액체로켓엔진 케로신 재생냉각 연소기 개발의 기술적인 검증을 완료했다는 의미를 부여할 수 있게 되었다.

• 약학회지
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• 제36권1호
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• pp.17-25
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• 1992

The general and some other pharmacological actions of growth hormone without N-terminal methionine(rhGH) were investigated in animals. The hormone had no influences on the central nervous system and on body temperature at a high oral dose of 40 IU/kg in animals. It had neither analgesic nor antiepileptic actions at the high doses. In the isolated ileum and trachea of guinea-pig and isolated stomach fundus and uterus of rat, it showed neither contractive nor relaxing effects at a concentration of $1{\times}10^{-3}\;IU/ml$ in bath, and no inhibitory action at a dose of $1{\times}10^{-3}\;IU/ml$ against the contractions produced by histamine ($5{\times}10^{-5}\;g/ml$), serotonin($1{\times}10^{-5}\;g/ml$), acetylcholine($1{\times}10^{-5}\;g/ml$) and oxytocin($5{\times}10^{-3}\;IU/ml$). Furthermore, the intravenous injection of 20 IU/kg rhGH had no influences on the normal blood pressure and respiration in rabbits. These negative results in pharmacological profile are thought that the hormone may not elicit serious side effects. On the other hand, the rhGH exhibited a weak inhibitory action of glucose tolerance in normal rats, significantly lowered the blood glucose contents in adrenalectomized rats 20 min after i.v. administration of 80 IU/kg, and showed a significant inhibitory effect on in vitro glycerol release in epinephrine-stimulated epididymal fat pad segments of rats.

• 약학회지
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• 제41권2호
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• pp.247-254
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• 1997

The proteinase-activated receptor (PAR-2) belongs to the family of seven transmembrane region receptors, like the thrombin receptor, it is activated by specific proteolytic clea vage of its extracellular amino terminus and a synthetic peptide (SLIGRL). The earthworm protein fraction (EPF) extracted from Lumbricus rubellus elicted dose- and endothelium-dependent relaxations in phenylephrine-contracted rat thoracic aorta, whereas heat inactivated EPF (0.5 ${\mu}g$ /ml) had no effect. In the presence of the nitric oxide synthase inhibitor NG-methyl-L-arginine (1.8 micro M), EPF (0.5 ${\mu}g$ /ml)-induced relaxations were partially inhibited. Furthermore, EPF (0.5 ${\mu}g$ /ml) dramatically caused relaxation of thrombin-desenstized rat thoracic aorta. These results indicate that EPF activates PAR-2 in vascular endothelial cell. Intravenous injection of EPF (20 mg/kg, bolus) into anesthetized rats produced a marked depressor response. EPF (0 ~ 80 ${\mu}g$ /ml, gradient) was very effective on increasing of perfusion volume in rabbit ear vessel preparations. These results imply the usefulness of EPF as a vascular smooth muscle relaxant and indicate that the activation of PAR-2 may be a mechanism of EPF on hemokinetic improvement.

• 한방안이비인후피부과학회지
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• 제7권1호
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• pp.53-84
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• 1994

The study has been carried out to investigate of the Allergic Rhinitis by referring to 87 literatures. The results were as follows; 1. In oriental medical science, Allergic Rhinitis is belong to the category of the 'BiGu'(鼻구) 'GuChe'(구체). The 'Gu'(구) of the BiGu means watery rhinorrhea, the 'Che'(체) of the GuChe means sneezing. 2. The cause of a disease summarize the weak of Lung, Spleen and Kidney, and invasion into the nasal cavity of PoongHan etc a wrong air. Sometimes the pathologial change appear PoongHan changeHwa(風寒化火), HwaYeol is hidden in the inside(火熱內伏). The contributing factors are found a season(spring, winter), an abnormal weather(運氣 : 少陰 少陽 陽明 司天, 歲金不及), an emotional stress, an external wound of the harmful air, a food allergens and fatigue, a contact of substances, a sunlight etc. 3. Predominant symptoms are watery rhinorrhea, sneezing and nasal obstruction. Sometimes accompanic symptoms are nasal bleeding, mucopurulent rhinorrhea, olfactory disturbance, nasal polyp, rhinolalia clausa, respiratory disfunction etc. 4. The treatment-methodes is as follows, OnBoPaeJang GeoPoongSanHan(溫補肺臟 祛風散寒), GeonBilkGi(健脾益氣), BoSinNabGi (補腎納氣). The treatmentherbs is as follows, OnBoJiLuDan GaGam(溫補止流丹 加減), OkByeongPoongSan plus ChangIJaSan GaGam(玉屛風散合 蒼耳子散 加減), BoJungIkGiTang GaGam plus SoCheongLyongTang(補中益氣湯加減 配合 小靑龍湯), SinGiHwan GaGam(腎氣丸加減), GaeJiTang(桂枝湯) etc. 5. The external treatment is as follows, JeokBi(滴鼻), ChuiBi(吹鼻), SaekBi(塞鼻), stick and herbs-injection on the acupuncture-point, pressure ear acupuncture-point, herbs-pillow etc. 6. The acupuncture-moxa treatment is as follows, the methodes of cure apply TongJoGyeongGi(通調經氣), SanTongBiGui(宣通鼻竅) etc. Predominent acupuncture-points are YoungHyang(迎香), InDang(印堂), BiTong(鼻通), SangSeong(上星), HabGok(合谷) and so on. As mentioned above, from now on, it's need to the oriental medical scientific study of the Immunity and Allergy and to the external treatment's application for the ascent of the treatment-effect of the allergic disease.

• Nuclear Engineering and Technology
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• 제44권7호
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• pp.807-816
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• 2012

The Three Mile Island Unit 2 (TMI-2) accident has been studied extensively, as part of both post-accident technical assessment and follow-up computer code calculations. The models used in computer codes for severe accidents have improved significantly over the years due to better understanding. It was decided to reanalyze the severe accident scenario using current state of the art codes and methodologies. This reanalysis was adopted as a part of the joint standard problem exercise for the Atomic Energy Regulatory Board (AERB) - United States Regulatory Commission (USNRC) bilateral safety meet. The accident scenario was divided into four phases for analysis viz., Phase 1 covers from the accident initiation to the shutdown of the last Reactor Coolant Pumps (RCPs) (0 to 100 min), Phase 2 covers initial fuel heat up and core degradation (100 to 174 min), Phase 3 is the period of recovery of the core water level by operating the reactor coolant pump, and the core reheat that followed (174 to 200 min) and Phase 4 covers refilling of the core by high pressure injection (200 to 300 min). The base case analysis was carried out for all four phases. The majority of the predicted parameters are in good agreement with the observed data. However, some parameters have significant deviations compared to the observed data. These discrepancies have arisen from uncertainties in boundary conditions, such as makeup flow, flow during the RCP 2B transient (Phase 3), models used in the code, the adopted nodalisation schemes, etc. In view of this, uncertainty and sensitivity analyses are carried out using simulation based techniques. The paper deals with uncertainty and sensitivity analyses carried out for the first three phases of the accident scenario.