• 대한안전경영과학회지
• /
• 제3권4호
• /
• pp.53-63
• /
• 2001

The individual rotten water purification tank recently discharges wastewater and sewage through the outlet without purification ability. The outlet water and affiliated water purification tank with microorganism cultivator tank cultivates microorganism and then drops the value BOD, COD of sewage and discharges the quality of water into the outlet. The blower and water pump operating continuously prompts the waste of energy and deterioration of equipment. Each room of deposition tank, foaming tank, microorganism cultivator tank is equipment with the sludge detection senses so it can detect the density of each room. The power-drive plant of the blower and water pump which are the system cultivating the microorganism must be made as fuzzy controlization (If the sludge amount of each room become higher, the rate of operation of blower and water pump must heighten, on the contrary, in case of row sludge amount, the total handling amount and microorganism handling amount of each room of control. Tank reducing the rate of operation must be DB. At present, the blower amount in proportion to the sludge and oxyzen demanding amount has to control. Each room mus be checked outlet level of the outlet, also each room must flow backward discharge materials, and must operate feed-back control until we want to be come as a below value of BOD/COD(10PPM ; KS).

• 대한설비공학회:학술대회논문집
• /
• 대한설비공학회 2006년도 하계학술발표대회 논문집
• /
• pp.903-908
• /
• 2006

Building energy simulation has become a useful tool for predicting cooling, heating and air-conditioning loads for facilities. It is important to provide building energy performances feed back to the mechanical and electrical system operator and engineer for energy conservation and maintenance of building. From this research, we set up the typical weather data of location, basic description of building, geometric modelling data and the specification of Installed primary HVAC system for establishing the simulation model about energy consuming that take place in multipurpose building complex. The simulation tool of building energy - EnergyPlus (DOE and BLAST based simulation S/W), it has been used and accomplished calculations and analyses for evaluating the effect of the system types and operating condition of central HVAC plant on the building energy consumption. In this paper, we offer comparison and simultaneous results those involve electricity consumption pattern and amount between actual operation versus EnergyPlus simulation to the object building during summer season.

• Nuclear Engineering and Technology
• /
• 제40권4호
• /
• pp.269-276
• /
• 2008

Operational license of WWER-440/213 units at Paks NPP, Hungary is limited to the design lifetime of 30 years. Prolongation by additional 20 years of the operational lifetime is feasible. Moreover, enhancement of the reactor thermal power by 8% will increase both the net power output and the competitiveness of the plant. Paks NPP is a pioneer considering the power up-rate and preparation of long-term operation of WWER-440/213 design. Systematic preparatory work for long-term operation of Paks NPP has been started in 2000. A regulatory framework and a comprehensive engineering practice have been developed. According to the authors view, creation of a gapless engineering system via consequent application of best practices, and feed-back of experiences together with proper consideration of WWER-440/V213 features are the decisive elements of ensuring the safety of long-term operation. That systematic engineering approach is in the focus of recent paper. Key elements of justification and measures for ensuring the safety of long-term operation of Paks NPP WWER-440/213 units are identified and discussed. These are the assessment of plant condition and review of adequacy of ageing management programmes, also the review, validation and reconstitution of time limited ageing analyses as core tasks of licence renewal.

• Asian-Australasian Journal of Animal Sciences
• /
• 제32권10호
• /
• pp.1565-1572
• /
• 2019

Objective: This study was aimed to investigate the effects of brewer's yeast hydrolysate (YH) on growth performance, nutrients digestibility, blood profiles and meat quality of growing pigs. Methods: A total of 200 growing pigs ($[Landrace{\times}Yorkshire]{\times}Duroc$) (initial body weight, $25.31{\pm}1.29kg$) were allotted to 5 treatments as follow: CON, basic diet; and YH treatment, CON+0.05%, 0.1%, 0.5%, and 1.0% of YH, respectively. Results: On wk 11, 16 and overall phase, pigs fed YH diet showed a linear improvement in average daily body gain and gain/feed (p<0.05). The pigs that received YH linearly increased the digestibility of dry matter, nitrogen, and energy on wk 11 and 16. The concentration of serum urea nitrogen was linearly increased in YH treatments on wk 16. However, the carcass weight, back fat and lean muscle percentage of pigs receiving YH had no significant change. Besides, no difference was observed in creatinine and total protein in the blood among treatments. Conclusion: The pigs fed a graded YH diet had improved growth performance and nutrient digestibility, meanwhile, the YH increased the serum urea nitrogen in the growing pigs.

• 한국식생활문화학회지
• /
• 제34권3호
• /
• pp.325-333
• /
• 2019

This study was a qualitative investigation of the process of adaptation of nutrition education programs by marriage immigrant women who completed education programs for training of food citizen leaders. Focus group interviews of seven marriage immigrant women from Vietnam, China, Mongolia and Russia were conducted and analyzed based on the Normalization Process Theory (NPT). Participants were aware of the purpose of the education program (coherence) and their confidence in organizing and reconstructing the knowledge of nutrition was increased after education (reflexive monitoring). However, they had difficulties attending long-term education programs (cognitive participation) and overcoming language barriers (collective action). Although the program was beneficial for the participants in that they could apply acquired nutrition knowledge to their everyday life as food citizen leaders, the continuous monitoring and feed-back system (management), customized application, and consideration of personal and social factors need to be developed and facilitated. In addition, various programs targeting marriage immigrant women may increase economic independence of these women. The NPT proved beneficial in conceptualizing the barriers and facilitators to implementing nutrition education. The successful implementation of nutrition intervention needs special support to overcome barriers to cognitive participation and collective action.

• 대한조선학회논문집
• /
• 제60권2호
• /
• pp.110-119
• /
• 2023

The prediction of ship resistance performance is typically obtained by Computational Fluid Dynamics (CFD) simulations or model tests in towing tank. However, these methods are both costly and time-consuming, so hull-form designers use statistical methods for a quick feed-back during the early design stage. It is well known that results from statistical methods are often less accurate compared to those from CFD simulations or model tests. To overcome this problem, this study suggests a new approach using a Convolution Neural Network (CNN) with voxelized hull-form data. By converting the original Computer Aided Design (CAD) data into three dimensional voxels, the CNN is able to abstract the hull-form data, focusing only on important features. For the verification, suggested method in this study was compared to a parametric method that uses hull parameters such as length overall and block coefficient as inputs. The results showed that the use of voxelized data significantly improves resistance performance prediction accuracy, compared to the parametric approach.

• 패션비즈니스
• /
• 제26권1호
• /
• pp.119-139
• /
• 2022

This study analyzed characteristics of domestic male fashion YouTubers and fashion contents in accordance with the need to analyze various content demands and testes of male consumers in the fashion industry. Using literature research and fashion expert evaluation, characteristic factors of fashion YouTubers were derived and the popular content of fashion YouTubers was classified by subject to analyze contents according to characteristics of YouTubers. Based on literature research, ten representative male fashion YouTubers were evaluated by fashion experts. Characteristics of male fashion contents in Korea were derived from attractiveness-friendliness, friendliness, professionalism-friendliness, and expertise. Contents of male fashion YouTubers were mainly composed of styling contents that could feed back daily looks, fashion-related information contents, and Vlogs. They mainly dealt with daily fashion coordination evaluation made by YouTubers. Based on the proportion of fashion information easily accessed by ordinary men through single fashion item's recommendations, shopping know-how or styling tip was mainly dealt with. This study was significant in that it analyzed characteristics and contents of male fashion YouTubers according to the need to analyze various content demands and tastes of male consumers who have recently emerged as an important consumer group in the fashion industry.

• 한국터널지하공간학회 논문집
• /
• 제2권3호
• /
• pp.25-36
• /
• 2000

본 연구에서는 합리적이고 공학적인 터널 해석 방법을 제시하기 위해, 시공 중 막장에서 관찰된 신뢰성 높은 암석 및 암반 평점분류 방식과 실내시험을 근거로 하는 일반화된 Hoek-Brown의 현장 암반 모델을 현재 시공이 완료된 지하철 터널 공사 현장의 계측자료와 비교 분석하였다. 그 결과로서 실무적인 측면에서의 터널해석을 위한 일반화된 Hoek-Brown 현장 암반모델의 국내 적용성을 제시하고 적용으로 인한 지반 입력물성치에 대한 타당성을 Trueman과 Trunk의 경험적인 추정식으로 검증하고자 한다. 그러나 불량한 암반의 RMR 값은 정확도가 떨어지기 때문에 일반화된 Hoek-Brown의 현장 암반모델의 적용성에 문제가 있으나, 시공 중 계측자료로 보완함으로서 위험도가 높은 불량암반의 적용성을 평가하였다. 본 연구를 통해서 암석의 경험적인 파괴규준인 일반화된 Hoek-Brown 현장 암반모델을 적용하여 변형과 강도에 과한 암반 입력물성치를 결정하는 과정에서 GSI하한치 = RMR-5를 사용함으로서 현장에서 안정해석의 정확도를 높일 수 있음을 알 수 있다. 단, 여기서는 편마암의 mi=33, 풍화암의 최저치 ${\sigma}ci=100t/m^2$ 이고 GSI는 RMR Chart의 해당연도와 상관없이 동일하다는 조건에서 이루어졌다.

• 전자공학회논문지SC
• /
• 제44권5호
• /
• pp.62-70
• /
• 2007

본 논문에서는 일정 토크영역에서 승압형 PFC 컨버터와 직접토크제어(DTC) 방법을 사용하여 BLDC 모터의 구동 시스템을 DSP(TMS320F2812)로 구현하였다. 기존의 6단계 PWM 전류제어와 달리 미리 정한 샘플시간 마다 간단한 look-up 표로부터 2상 도통 모드에 대한 인버터의 전압 상태 벡터를 설정함으로써 원하는 전류파형을 만들었으며 이로부터 기존의 전류제어기보다 훨씬 빠른 토크 응답특성을 얻을 수 있었다. 또한 BLDC 모터의 비 이상적인 사다리형 역기전력에 의해 발생되는 저주파 토크변동을 저감하기 위하여 위치 loop-up 표를 사용하였다. 아울러 역률을 보정하기 위해 승압형 PFC 컨버터를 구성하였고 이 때 전파 정류된 입력전압과 출력전압, 인덕터의 전류에 의해 평균전류모드 제어 방식으로 80 kHz마다 PWM 듀티(duty)가 조절 되도록 하였다. 이와 같이 복잡한 제어 알고리즘은 초고속 DSP의 출현으로 PFC와 DTC 알고리즘이 동시에 제어가 가능하며, 본 논문에서는 DTC 알고리즘을 구현할 때 DSP의 일반 범용의 출력포트를 사용하여 구현하였고 단지 PFC에서만 1개의 PWM을 사용하여 디지털 제어기를 구현하였다. 실험을 통해 DTC 알고리즘과 PFC 컨버터를 이용한 BLDC 모터 구동 시스템의 타당성과 효용성을 보였고, 실험결과로부터 PFC 컨버터를 사용하지 않았을 때는 역률이 약 0.77이었으나 PFC 컨버터를 사용하였을 때는 부하변동에 관계없이 약 0.9997로 크게 향상됨을 확인하였다.

• Journal of Animal Science and Technology
• /
• 제47권6호
• /
• pp.963-974
• /
• 2005

본 시험은 두충 급여가 거세한우의 성장, 도체특성, 육질특성 및 육의 지방산 조성에 미치는 영향을 구명하기 위하여 수행하였다. 기초사료로 배합사료와 볏짚을 급여하였으며, 건조 두충 잎을 건물기준으로 조사료의 3, 5 및 10%를 대체․급여하였다. 시험사료의 사료적 가치를 평가하기 위하여 평균체중 321±13kg의 거세한우 72두(4개구$\time$6 두$\time$3 반복)를 공시하여 약 15개월간 실시하였다. 일당 증체량은 대조구를 포함한 모든 처리구에서 0.81-0.86kg으로 유의차는 없었다. 사료요구율도 대조구를 포함한 모든 처리구에서 10.05-10.59로서 개선효과는 없었다. 분변내 NH3 가스 발생량은 두충 잎의 급여비율이 높을수록 감소하였다. 즉 40℃에서 12시간 발효시에는 대조구와 3% 구는 각각 30.6ppm과 29.8ppm이었으나 5% 구와 10% 구는 각각 20.3ppm과 21.6ppm으로 낮았다(p<0.05). 등지방 두께는 대조구는 15.0mm였으며 5-10% 급여시 10.2-10.5mm로 얇은 경향이었다(p<0.05). 육량 A 등급 출현율은 3% 급여시 약 20%가 증가하였으며, 육질 1+와 1 등급 출현율은 두충 잎을 5-10% 급여시 약 10-15%가 증가하였다. 등심의 육색에 대한 CIE L*, a* 및 b* 값은 각 시험구간 차이는 없었으며, 우둔의 CIE L*, a* 및 b* 값에서도 각 시험구간에 차이는 없었다. 지방산 함량에 있어서 등심과 우둔에서 공히 C18:1은 두충 잎을 5-10% 급여구에서 증가하였다(p<0.05). 등심의 cholesterol 함량은 10% 급여한 구가 53.3mg /100g으로 대조구와 3% 구 및 5% 구의 55.7-57.0mg/100g으로 비해 낮았다(p<0.05). 하리의 발생비율은 대조구가 약 20.3%였으며 두충 잎을 5-10% 대체 급여할 경우에는 10.4-12.5%로 크게 감소되었다(p<0.05). 호흡기 발병비율은 두충 잎을 대체함으로 개선되는 경향이지만 유의차는 없었다. 이상의 결과를 종합하면, 두충 잎에는 다양한 기능성을 가지는 생리활성 물질이 상당량 함유된 기능성 사료로의 개발 가능성이 매우 높다. 또한 두충 잎을 음건하여 반추동물에 급여할 경우 육질 개선 및 하리 발생비율이 감소되기 때문에 고급육 생산에 효과적이었다. 따라서 두충 잎을 거세한우에 급여할 경우 조사료의 5-10%를 대체하는 것이 가장 유리할 것으로 생각된다.