As the capacity of renewable power generation facilities rapidly increases, the variability of electric power system and gas turbine power generation is also increasing. Therefore, problems may occur that require urgent repair while the gas turbine rotor is stopped. When the gas turbine rotor turning is stopped and then restarted, if the turning period is not appropriate, severe vibration may occur due to rotor bending. As a result of the experiment, it was confirmed that normal operation is possible when the gap data measured at the start of rotor turning after maintenance work is similar to the existing value. And the vibration value at the start of rotor turning was lower as the rotor temperature was lower or the stop period was shorter.

단계별 작업기를 통합하여 일관화하는 복합기를 실용화하여 생산효율이 개선되어 밭농업 생력화에 기여하였다. 본 연구의 목적은 SAS를 이용한 복합작업기의 최적 작업조건을 반응표면기법(RSM)으로 구명하고 최적 성능을 실험으로 평가하여 집약적 밭농업의 트랙터 운용방법을 제시하고자 하였다. 로터리 작업에서 회전속도와 전진속도의 관계는 견인력의 효율성과 멀칭 등 작업품질에 적정한 트랙터의 운용기준 조건을 나타낸다. 슬립과 공차를 고려하면 통합 선택기준 작업속도는 3.4<SPDcr<4.7 km/h 범위로 확장되고, 로터리 피치(p)가 40<p<56 cm/rev로 판단되었다. 여러 검토조건에 서 연료소비량을 예측하고 동력의 효율성을 평가하는데 Kim 모델이 사용되었다. 목적함수를 만족하는 적정 p의 범위에 속하는 공칭 작업속도(SPD)를 엔진속도비(n)와 주행 기어비(GR)로 나타내어 최적 설계점은 카테고리 1급(DK450) 트랙터에 대하여 독립변수 n, GR/변속단수는 0.65, 401/M4로 구명되었다. 실험 평가에서 작은 트랙터는 시뮬레이션과 비교적 일치하였고, 큰 트랙터의 실험은 낮은 연료소비량과 실작업속도로 오차를 유발하였다.

The evergreen oak tree, Quercus myrsinaefolia Blume, is not only economically important for wood, medicine, landscape trees, etc., but also becoming more important in terms of ecology due to climate change. However, asexual reproduction was difficult, so this study was conducted to establish the optimum conditions for micropropagation by shoot multiplication. The surface sterilized seeds of Q. myrsinaefolia were successfully germinated in WPM basal medium. BAP (1.0 mg/L) treatment was most effective for inducing multiple shoots. The highest induction rates of adventitious roots from the multiple shoots was shown in the treatment of 1.0 mg/L NAA. Both MS and WPM medium were most effective for growth of multiplied plantlets. For ex vitro acclimatization, the survival rates of multiplied plantlets were 100% in vermiculite and commercial soil. The results of this study can be used for proliferation and supply, and establishment of ex situ conservation of Q. myrsinaefolia elite trees.

To investigate the proper eclosion condition of Black Soldier Fly(BSF), Hermetia illucens was investigated the eclosionperiod and rate by cluster size and temperature for 3 weeks. Respectively, ten pupaes were added to the pupae(FTP)and rice husk (TTR) at 25℃, also treated only with pupae(TTR) and rice husk (TTR) at 30℃. In addition, Four hundredpupaes of each pupa were treated with only pupa (SP) and rice husk(SR) at 25℃, while was tested only pupa(TP) andrice husk(TR) at 30℃. As a result of the small group experiment, the FTR group showed the highly rate of emergencerate of 96.6%, which was more efficiently than other treatments, and also, TR group showed of highly efficiency (96.25%).Compared to the small group experiment, the algebra rate and algebra rate averaged 1.1 days faster and increased by13.3%. Two experimental results showed that eclosion rate was influenced by temperature and eclosionrate by shelter.

본 연구는 신품종 다래‘오텀센스’의 수확적기를 구명하고자 생육시기별 과실품질과 후숙 특성을 조 사하였다. 과실의 후숙은 과실의 비대가 최대가 되고 과실 내 종자가 성숙한 이후에 가능하였으나, 종 자가 성숙 상태만으로는 후숙 가능성을 판단할 수 없었다. 산함량은 1.05%이상이 되어야 정상적인 후 숙이 진행되었으며 후숙이 가능한 시점의 경도는 평균 27.1N이었다. 성숙기에 접근한 과실의 가용성 고 형물 함량은 만개후 71일부터 90일까지 시기별로 유의적인 차이가 없었지만 후숙 후의 가용성 고형물 함량에는 유의적 차이가 있어 가용성 고형물 함량으로 수확적기를 구명하기에는 어려움이 있었다. 다래 의 저장 중 중량감소율은 2℃에 상대습도 90%저장구가 낮았고, 부패율은 20℃, 상대습도 45% 저장구 에서는 저장 8일 후부터 증가하기 시작하였고, 2℃에 상대습도 45%와 상대습도 90% 모두 저장 후 20 일까지 10% 이하로 유지되었다. 따라서 과실의 크기, 경도 및 후숙 전·후의 가용성 고형물 함량 등을 종합하여 고려해 볼 때 신품종 다래‘오텀센스’의 수확적기의 만개 후 생육일수는 85일(9월 2일)이었 고, 2℃에 상대습도 90%인 저온고습환경이 적합하였다.

This study was performed to determine the total anthocyanin contents, DPPH radical scavenging activity, and SODlike activity of extracted anthocyanins from Bokbunja for analyzing the optimal conditions of enzyme treatment by response surface methodology (RSM) based on three factors: concentration of Pectinex Ultra SP-L, reaction temperature, and reaction time. The optimal enzyme treatment conditions of Pectinex Ultra SP-L concentration, reaction temperature, reaction time, and overall desirability by analysis of multiple response surface methodology with the same weighed value of each dependent variable were 0.5 mL/100 L, 20oC, 2 hr, and 0.63, respectively. Total anthocyanin content, DPPH radical scavenging activity, and SOD-like activity of the conditions stated above were 5.2 mg/ 100 g, 61.3% and 30.5%, respectively. Meanwhile, those of the control were 1.1 mg/100 g, 11.8% and 1.1%, respectively.method.

청색 발광대역을 갖는 Polyfluorene Polymer(PFO) 베이스 Blue-OLED의 PFO Emitting layer에 YAG형광체를 분산시켜, Blue light와 Down-conversion 된 Yellow light를 얻고 이들의 보색혼합으로 백색광을 얻는 W-OLED 소자를 제작하였다. 소자의 기본구조는 5층의 적층구조를 가지며 cathode(Al)/YAG@PFO/TPD/TiOPc/Anode(ITO)의 단순한 구조로 기판유리를 제외하고 1000nm 이하의 두께로 제작이 가능한 초박막 구조의 W-OLED이다. YAG 형광체가 분산된 W-OLED의 전류밀도는 형광체가첨가되지 않은 경우에 비하여 약 2배 이상의 전류밀도증가를 나타내었다. 이는 첨가된 YAG 형광체의 표면전하에 기인한 것으로 생각된다. 전류밀도의 증가는 청색발광 휘도의 증가와 함께 down-conversion된 황색광이 증가하여 B+Y=White 보색 혼합된 백색광이 방출되었다. 적절한 동작을 위한 소자의 동작전압은 전류밀도 증가량의 변화율에서 주목할 만한 특이점이 나타나지 않는 전압범위인 15V-25V 구간으로 판단된다.

Optimal conditions for HA plasma spray-coating on Ti6Al4V alloy were investigated in order to obtain enhanced bone-bonding ability with Ti6Al4V alloy. The properties of plasma spray coated film were analyzed by SEM, XRD, surface roughness measurement, and adhesion strength test because the film's transformed phase and crystallinity were known to be influential to bone-bonding ability withTi6Al4V alloy. The films were formed by a plasma spray coating technique with various combinations of plasma power, spray distance, and auxiliary He gas pressure. The film properties were analyzed in order to determine the optimal spray coating parameters with which we will able to achieve enhanced bone-bonding ability with Ti6Al4V alloy. The most influential coating parameter was found to be the plasma spray distance to the specimen from the spray gun nozzle. Additionally, it was observed that a relatively higher film crystallinity can be obtained with lower auxiliary gas pressure. Moderate adhesion strength can be achievable at minimal plasma power. That is, adhesion strength is minimally dependent on the plasma power. The combination of shorter spray distance, lower auxiliary gas pressure, and moderate spray power can be recommended as the optimal spray conditions. In this study, optimal plasma spray coated films were formed with spray distance of 70 mm, plasma current of 800 A, and auxiliary gas pressure of 60 psi.

The purpose of this paper is to provide the optimal grinding conditions of metal components of a spectacles. The main elements of grinding conditions are composed of grain size, grade, structure, grinding wheel velocity and shifting components velocity. The conditions are co- related and influenced at each other. The precision of grinding surface was controled the each grinding conditions, mutual relations and reciprocal actions. It was studied the co-relations of grinding conditions those machining time-grain size-roughness, grade-roughness, machining time-characteristics of structure- roughness, number of production-roughnessgrinding wheel velocity, number of production-shifting velocity-grinding wheel velocity. The optimal grinding working condition satisfied the demanded surface accuracy 0.5 ~ 1.5μm. Based on these results, the optimal conditions were that the grain size was 60, the grade was middle of HIJK and LMNO, wheel velocity was 25 m/sec, shifting velocity was 15 m/min.

Recently, various efforts to make more speedy and precision machine tool to improve productivity and also various efforts to solve environmental problem are going on, so that dry cutting in manufacturing industry, which needs environmental conscious design and development of manufacturing technique, is becoming a very important assignment to solve. Because dry cutting does not use cutting fluid, we need other methods that can be used instead of cutting fluid, which does cooling, lubricating, chip washing, and anti-corrosion. Especially, because turning is a continuous work, the consideration of tool life and surface roughness due to continuous heat and poor lubrication is important. The purposes of this paper are the consideration of how well the compressed air can work instead of cutting fluid, and also the development of the method to select the optimum machining condition by the minimum numbers of experiments through the Taguchi method.

Mahalanobis Taguchi-System (MTS) has been used in different diagnostic applications to make quantitative decisions by constructing a multivariate system using data analytic methods without any assumption regarding statistical distribution. MTS performs Taguchi's fractional factorial design based on the Mahahlanobis distance as a performance metric. In this study, MTS used for analyzing automotive ride satisfaction, which measured as a CSR(Customer Satisfaction Rating). The automobile which has a good CSR score treated as a normal group for constructing Mahalanobis space. The results of this research show that two attribute (Impact Hardness and Memory Shake) have a minus gain value and can be removed from further analysis. With the linear regression model, the difference of CSR between using all 6 attributes and just using significant 4 attributes compared.

우렁이에서 유래한 콘드로이틴 설페이트를 새로운 기능성 식품소재로 이용하고자, 우렁이 콘드로이틴 설페이트 분석 및 고효율 추출방법을 확립하기 위해 본 연구를 수행하였다. 생체의 콘드로이틴 설페이트 함량이 18.4%로 다른 패류(재첩7.1%, 홍합13.5%,다슬기10%)에 비해 높게 나타났다. 추출 전처리 공정으로서 분쇄 및 원적외선 처리 결과, 추출 가공할 경우 원료를 분말화 했을 때 추출 효율이 증가되었으며, 원적외선 처리는 추출에 영향을 미치지 않았다. 추출 보조공정인 극초단파처리와 초음파 추출 방식은 가용성 고형분의 추출은 증가시켰으나 콘드로이틴의 추출 수율은 매우 낮았다. 최적 추출공정 선별을 위해 모든 추출 공정의 가용성 고형분, 단백질 그리고 콘드로이틴 설페이트 추출 수율을 비교한 결과, 가압처리 방식을 이용해 121℃에서 120min간 추출하는 것이 가장 효과적인 것으로 나타났다.

Production of transgenic animals for studying specific gene has been limited due to a low efficiency, lack of skilled researchers and the need for expensive equipment. Currently, the boar spermatozoa as a vector to deliver exogenous DNA into the oocyte were used to improve the efficiency of transfection rate. In this study, we revealed that the optimal conditions for DNA uptake in spermatozoa by liposome were to 90 min of incubation, 17'C, 10' spermatozoa, 4 ng/ml of exogenous DNA and 0.5% (v/v) liposome, without damage to fertility. In addition, the developmental rate to the blastocyst stage of embryo in control group was significantly higher than those embryos with exogenous DNA and liposome, whereas there were no significant differences in embryo development between the liposome and type of DNA. The transfection rates of embryo using treated spermatozoa with both liposome and circular DNA were higher than those using linear DNA. These findings raise the possibility thattreated spermatozoa with liposome/DNA complexes could be used in in vitro fertilization, and the exogenous DNA transferred into the oocytes. Taken together, we demonstrated that liposome a vector for the uptake of exogenous DNA in boar spermatozoa could improve the efficiency of sperm-mediated gene transfer in creating transgenic pig and the other domestic transgenic animals.

This study was carried out to develop and characterize a drinking extract of disk abalone to keep the price level and to raise a added value of disk abalone. Fresh raw disk abalone was composed of 29.3% of the shell part, 17.7% of the intestinal part, and 43.9% of the flesh part. and the amount of nutritive substances in the intestinal part were higher those in the flesh part. Arginine was the most abundant amino acid both in raw and drinking extract of disk abalone. Drinking extract prepared with 250 g of the flesh of disk abalone at 100℃ for 2 hours was better in color and overall taste than those made with 150 g or 200 g of the flesh. As the extracting temperature was gradually increased or the extracting period was gradually extended, the extracting effect was slightly improved but the color of the extract turned out to undesirable one. The desirable sea tangle extract could be made when 15 g of sea tangle was extracted in 1 l of water at 100℃ for 2 hours, and which was accorded well with the color of drinking abalone extract. From these results the best drinking extract of disk abalone can be manufactured with 250 g of the abalone flesh extracted in 1 l of water at 100℃ for 2 hours.

  Mahalanobis Taguchi-System (MTS) is a pattern information technology, which has been used in different diagnostic applications to make quantitative decisions by constructing a multivariate system using data analytic methods without any assumption regard

In this study, numerical analysis of TMD to estimate optimal-design-parameter is investigated using actual excitation, and evaluated by comparing results of numerical analysis and optimal-design-parameter was devised by Soong. It assumed between 1~2 seconds the 1st mode natural period of an aged apartment which has 10~15 stories and then investigated optimal-design-parameter of actual excitation for evaluate optimal frequency ratio and damping ratio according to local site condition. At this time mass ratio was 1% and range of tuned frequency ratio was 0.8Hz to 1.2Hz at intervals of 0.01Hz, and optimal damping ratio was 1% to 14% at intervals of 0.002%. It estimated Optimal-design-parameter was evaluated by numerical analysis according to peak and RMS displacement, acceleration respectively local site. And the result of evaluated respond performance parameter respectively a period was shown low numerical-value than optimal-design-parameter was devised by Soong what is more peak acceleration indicated performance difference of 20% over

농촌진흥청 응용미생물과와 농가에서 수집한 꽃송이버섯 균주의 배양적 특성을 조사하였다. 기본배지는 감자 추출물을 이용한 PBA, PDA, PDM 배지에서 균사생장이 양호한 경향이었고, 특히 대나무톱밥 추출물이 함유된 PBA 배지에서 균사생장 및 밀도가 가장 좋았다. 꽃송이버섯 균사의 최적 배양온도는 25℃이었으며, 30℃ 이상에서는 균사생장이 전혀 이루어지지 않았다. 최적 pH 조건은 모든 균주가 pH 5.0에서 균사생장 및 밀도가 양호하였다. 대부분 균주가 pH 4.0에서 균사생장은 좋았으나 밀도가 현저히 낮은 경향이었지만, SC12 균주는 pH 4.0에서도 균사생장이 양호하였다. 탄소원은 단당류인 glucose, fructose, mannose, xylose와 이당류인 maltose에서 균사생장이 양호하고 밀도가 높았다. 이중 가장 경제적인 탄소원 glucose를 1.0∼1.5% 농도로 처리하였을 때 균사생장이 양호하였다. 질소원은 threonine, peptone, glycine, glutamine 그리고 valine을 첨가한 배지에서 균사생장이 양호하고 밀도가 높았으며, 질소원 peptone을 0.3% 처리 하였을 때 균사생장 및 밀도가 가장 좋았다.