• Nuclear Engineering and Technology
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• 제27권3호
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• pp.317-326
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• 1995

증기발생기의 수위제어시스템에 대해 특히 저출력시 수위제어의 문제점을 분석고찰하고 퍼지제어기 법을 기반으로 한 안정되고도 신속한 수위제어에 관한 연구가 주로 수행되었다. 문제해결의 한 방안으로서, 중요 제어변수임에도 불구하고 저출력운전시 저유량구간의 추정불량으로 인해 사용할 수 없는 유량신호를 대신하여 밸브개도를 이용한 대체정보를 채용하였으며 또한 소속함수크기의 유동적인 조정방법을 이용하여 수위오차가 크게 발생한 과도상태시에는 신속한 수위회복이 이루어지도록 하였다. 실제운전환경에서 제시된 제어기를 튜닝 하기 위한 방법으로서 제어성능지수 및 decent method를 이용한 소속함수의 self-tuning 기법을 제시하였다. 원자력 연구소의 연수원에 설치된 교육훈련용 시뮬레이터에서 수행된 실험결과는 제시된 제어기 및 튜닝방법의 안정되고 우수한 성능구현 및 실질적 인 유용성을 보여주고 있다.

• Journal of Nutrition and Health
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• 제38권5호
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• pp.344-351
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• 2005

The purpose of this study was to examine the impact of isoflavones on lipid concentrations and hepatic LDL receptor mRNA level in growing female rats. Twenty four rats (body weight $75\pm5g$) were randomly assigned to one of two groups, consuming control diet or isoflavones supplemented diet (57mg isoflavones/100g diet). All rats has been fed on experimental diet and deionized water ad libitum for 9 weeks. The concentration of triglyceride and total cholesterol were measured in serum and liver. Serum HDL cholesterol was measured. Hepatic LDL receptor mRNA level was tested by RT-PCR. Supplementation of isoflavones did not affect weight gain, mean food intake and food efficiency ratio. Serum total cholesterol and non-HDL cholesterol of isoflavones supplemented rats were significantly lower than those of control rats (p<0.05). But hepatic cholseterol was not influenced by supplementation of isoflavones. Hepatic LDL receptor mRNA level not significantly different between control group and isoflavones supplemented group. Therefore, isoflavones may be beneficial on serum cholesterol and non-HDL cholesterol lowering in growing female rats.

• 동의생리병리학회지
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• 제21권3호
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• pp.705-708
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• 2007

The objective of the study was to observe the anti-diabetic effect of Solani nigri Herba(SH). The following experimental results were derived from the measurement of the levels of glucose, GOT and GPT in the serum and weight from a group of experimental rats by way of the injection of streptozotocin as well as the oral administration of Solani nigri Herba water extracts. The glucose level in the serum significantly decreased in the Solani nigri Herba-dosed group(SH2,12.6 mg/100 g rat weight) on the 10th day. The GOT level of SHI(4.2 mg/100 g Solani nigri Herba) and SH2 in the serum slightly decreased, but no significance to compare with control group. The GPT level of SH1 and SH2 in the serum slightly decreased, but no significance to compare with control group. The weight of rat of SH1 and SH2 in the serum slightly increased, but no significance to compare with control group. In conclusion, Solani nigri Herba appeared to have significance inhibitory effects on the rise of blood sugar level in the experimentally induced diabetics.

• 한국수자원학회논문집
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• 제33권6호
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• pp.745-755
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• 2000

현재 우리나라에서 홍수조절 업무에 황용하고 있는 홍수관리시스템은 댐에서 조절이 불가능한 댐하류부 수문현상들을 고려하여 방류계획을 수립할 수 없으며, 예측 강우량에 의한 댐으로의 유출상황을 고려한 예비방류에 관한 지침이 마련되어 있지 않다. 따라서 본 연구에서는 댐의 제약조건 댐 상.하류의 유출상황을 고려하여 홍수기 댐을 운영 할 수 있는 모의기법에 의한 모형을 개발하였다. 개발된 모형(EV ROM이라 명명)은 댐에서 조절이 불가능한 댐하류 지류에 의한 하류 홍수제어 지점의 Cumulative Lateral Flow Hydrograph를 고려하여 방류계획을 수립한다. EV ROM에서는 댐하류 지역의 첨두홍수량 경감을 위하여 홍수제어지점의 수문곡선 상승부에서 예비방류를, 첨두부에서는 댐에 저류를 하였다가 수문곡선 하강부에 다시 방류를 수행하는 특징이 있다. EV ROM을 강우-유출모형에 결합하여 금강수계 대청댐을 중심으로 3개 홍수사상에 적용해 본 결과, 기존의 Rigid ROM이나 Technical ROM 보다 우수한 것으로 나타났다. 이는 본 연구에서 개발한 EV ROM이 댐 유역뿐만 아니라 댐하류 홍수제어지점의 수문상황을 동시에 고려하여 댐의 방류계열을 결정하기 때문이다. 따라서, 본 연구에서 개발된 EV ROM을 다양한 홍수사상에 적용, 예측강우량의 정확도 개선 및 프로그램의 보완이 이루어진다면, 현재보다 한차원 높아진 저수지운영을 기대 할 수 있을 것이다.

• Journal of Nutrition and Health
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• 제28권9호
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• pp.817-824
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• 1995

This study was performed to evaluate the effect of dietary protein level on Ca efficiency in bone mineral density in growing male rats. Twenty male rate were divided into two groups. The rats in one group were fed on casein 20% diet as control group and the others were fed on casein 40% diet as protein group. All rats were fed on experimental diet and deionized water ad libitum for 9 weeks. The total body, spine and femur bone mineral density and bone mineral content were measured using dual energy-x ray absorptiometry. Urinary calcium, phosphate, pyridinoline and creatinine, serum calcium, phosphate, total protein, albumin, alkaline phosphatase(ALP) and osteocalcin were measured. Urinary Ca excretion, pyridinoline and crosslinks value and serum ALP content seem to be increased in high protein group. It appears that the growing rats in high protein group had a higher bone resprption and bone formation than those in control group. Animal fad a high protein diet had a siginficantly higher Ca efficiency in BMD, BMC of total body, spine and femur. The results of this show that increasing of dietary protein level (40%) is beneficial of improvement of Ca efficiency during growing period.

• 한국지능시스템학회논문지
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• 제16권2호
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• pp.191-197
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• 2006

본 논문에서는 원저 증기발생기 수위제어계통을 위한 고장검출 시스템을 설계한다. 이를 위하여 증기발생기 수위제어계통의 비선형 동적방정식을 미지의 매개변수를 갖는 T-S 퍼지시스템으로 모델링하고 좌 소인수 분해를 이용하여 오차발생기를 설계한다. 고장검출의 성능을 향상시키기 위하여 고장검출 필터의 설계법을 제안한다. 제시한 방법의 효용성을 컴퓨터 모의실험을 통하여 입증한다.

• Asian-Australasian Journal of Animal Sciences
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• 제28권2호
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• pp.252-259
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• 2015

The present study was conducted to investigate the efficacy of sweet potato powder (SPP) and water as a fat replacer in low-fat pork patties. Low-fat pork patties were developed by replacing the added fat with combinations of SPP and chilled water. Three different levels of SPP/chilled water viz. 0.5/9.5% (T-1), 1.0/9.0% (T-2), and 1.5/8.5% (T-3) were compared with a control containing 10% animal fat. The quality of low-fat pork patties was evaluated for physico-chemical (pH, emulsion stability, cooking yield, $a_w$), proximate, instrumental colour and textural profile, and sensory attributes. The cooking yield and emulsion stability improved (p<0.05) in all treatments over the control and were highest in T-2. Instrumental texture profile attributes and hardness decreased, whereas cohesiveness increased compared with control, irrespective of SPP level. Dimensional parameters (% gain in height and % decrease in diameter) were better maintained during cooking in the low-fat product than control. The sensory quality attributes juiciness, texture and overall acceptability of T-2 and T-3 were (p<0.05) higher than control. Results concluded that low-fat pork patties with acceptable sensory attributes, improved cooking yield and textural attributes can be successfully developed with the incorporation of a combination of 1.0% SPP and 9.0% chilled water.

• 디지털융복합연구
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• 제13권3호
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• pp.19-29
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• 2015

공공재인 상수도서비스의 품질을 체계적으로 평가하기 위해 주관적인 만족도만을 조사하는 기존 고객만족도 조사의 한계를 극복하고, 최적의 평가 모형을 선택하여 품질평가를 통해 만족/불만족 영향요인을 규명하여 이를 개선하기 위한 정책방안을 제시하는 것이 목적이다. 본 연구는 상수도서비스 품질에 대해 실증적으로 평가하고 시정에 미치는 영향에 대하여 분석해 본 결과, 공공서비스 품질이 고객만족에 영향을 미치며, 고객만족은 사후 관리로서 시정에 대한 신뢰와 지지에 매개효과가 있는 것으로 나타났다. 물론 서비스 품질의 높고 낮음도 중요하지만 나아가 서비스 품질에서 만족과 신뢰가 시작된다는 의미에서 사후 관리의 중요성을 부여할 수 있다. 본 연구모형은 상수도 서비스의 일선 현장에서 서비스 품질을 주기적으로 측정하여 관리하는 지표로 활용될 수 있다. 사업자 스스로 서비스 품질을 주기적으로 평가해서 고객의 니즈를 명확하게 파악하고 이에 걸맞은 정책을 신속하게 구사하는 것은 고객의 만족도와 신뢰수준을 높이는데 있어 매우 유용한 방법이 될 것이다.

• Asian-Australasian Journal of Animal Sciences
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• 제32권4호
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• pp.599-606
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• 2019

Objective: The present study was carried out to evaluate the effect of high dietary cation and anion difference (DCAD) rations on diurnal variations in eating and meal patterns, water intake and urination patterns in dairy goats fed under high ambient temperature (HTa). Methods: Ten crossbred dairy goats during peri-parturition period were selected and divided into two groups of five animals each. Experimental diets were control DCAD (control, 22.8 mEq/100 g dry matter [DM]) and high DCAD (DCAD, 39.1 mEq/100 g DM). The composition of two diets consisted of 44% corn silage and 56% concentrate. From the 2nd week to 8th week postpartum, goats were fed ad libitum twice daily either with the control or DCAD total mix ration with free access to water. The spontaneous eating and drinking patterns were determined. Results: The environmental conditions in the present experiment indicated that goats were fed under HTa conditions (average peak THI = 85.2) and were in heat stress. In addition to the typical HTa induced tachypnoea in both groups, the respiratory rate in the DCAD group was significantly higher than the control group (p<0.05). Although the goats from both groups showed comparable level of eating, drinking and urination during experiment, the meal pattern and water intake were different. High DCAD apparently increased eating and meal patterns compared with the control. At week 8 postpartum, goats from high DCAD group had significant (p<0.05) bigger meal size and longer meal duration. Moreover, high DCAD appeared to increase night-time water intake (p<0.05). Conclusion: Both meal pattern and night-time drinking effects of DCAD suggested that feeding with high DCAD ration may alleviate the effect of heat stress in dairy goat fed under HTa conditions.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2004년도 학술발표회
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• pp.790-793
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• 2004

TM/TC system is composed of control center, reservoirs, pumping stations and twelve canal systems. For this system we developed water management program which includes flood forecast program, drought reduction program, irrigation scheduling program and database program. With these program we expect that operators improve the irrigation efficiencies of the irrigation systems due to the timely irrigation on a right place, in a proper quantity and refute tile cost of maintenance and reduce flood and drought damages. In agricultural engineering respect, the databases including water level, rainfall, the amount of flowing can be useful to the researcher who make a study of hydrology and hydraulics in . rural area. Water management program records all of the TM/TC data to MDB format file per 10 minutes.