• The Journal of Asian Finance, Economics and Business
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• 제7권11호
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• pp.575-583
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• 2020

Vietnam is the country with the largest animal feed production in Southeast Asia. Domestic animal feed manufacturing enterprises play an important role in animal husbandry in particular and in agriculture in general. However, domestic animal feed enterprises in Vietnam are encountering shortcomings. This paper is conducted to investigate the impact levels of external determinants on business performance of domestic animal feed manufacturing enterprises, including: (i) policy and economic mechanism, (ii) supply-demand of animal feed products, and (iii) nature and level of market competition. We presented a research method, explaining the dependent variable 'business performance' and the independent variables. Data were collected from 120 questionnaires from domestic animal feed manufacturing enterprises. Based on these data, we use Cronbach's Alpha, EFA and run regression model for assessing the impact levels of each independent variable on the dependent variable of business performance of domestic animal feed manufacturing enterprises. The results show that three external determinants including (i) policy and economic mechanism, (ii) supply-demand of animal feed products, and (iii) nature and level of market competition, have positive relationships with business performance. Based on the findings, some recommendations are given for improving business performance of domestic animal feed manufacturing enterprises to ensure sustainability.

• Asian-Australasian Journal of Animal Sciences
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• 제23권3호
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• pp.333-339
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• 2010

The objectives of this study were to use the NRC-2001 model and DVE/OEB system to model potential nutrient supply to ruminants and to compare frost damaged (also called "frozen" wheat with normal wheat. Quantitative predictions were made in terms of: i) Truly absorbed rumen synthesized microbial protein in the small intestine; ii) Truly absorbed rumen undegraded feed protein in the small intestine; iii) Endogenous protein in the digestive tract; iv). Total truly absorbed protein in the small intestine; and v). Protein degraded balance. The overall yield losses of the frozen wheat were 24%. Results showed that using the DVE/OEB system to predict the potential nutrient supply, the frozen wheat had similar truly absorbed rumen synthesized microbial protein (65 vs. 66 g/kg DM; p>0.05), tended to have lower truly absorbed rumen undegraded feed protein (39 vs. 53 g/kg DM; p<0.10) and had higher endogenous protein (14 vs. 9 g/kg DM; p<0.05). Total truly absorbed protein in the small intestine was significantly lower (89 vs. 110 g/kg DM, p<0.05) in the frozen wheat. The protein degraded balance was similar and both were negative (-2 vs. -1 g/kg DM). Using the NRC-2001 model to predict the potential nutrient supply, the frozen wheat also had similar truly absorbed rumen synthesized microbial protein (average 56 g/kg DM; p>0.05), tended to have lower truly absorbed rumen undegraded feed protein (35 vs. 48, g/kg DM; p<0.10) and had similar endogenous protein (average 4 g/kg DM; p>0.05). Total truly absorbed protein in the small intestine was significantly lower (95 vs. 108 g/kg DM, p<0.05) in the frozen wheat. The protein degraded balance was not significantly different and both were negative (-16 vs. -19 g/kg DM). In conclusion, both models predict lower protein value and negative protein degraded balance in the frozen wheat. The frost damage to the wheat reduced nutrient content and availability and thus reduced nutrient supply to ruminants by around 12 to 19%.

• 한국양식학회:학술대회논문집
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• 한국양식학회 2002년도 한일 일한 증양식 심포지엄 요약집
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• pp.21-21
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• 2002

• 전력전자학회논문지
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• 제27권5호
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• pp.367-375
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• 2022

Generally, a proportional-resonant controller is used to eliminate steady-state errors during the voltage-current control of a double-conversion uninterruptible power supply (UPS) in a stationary reference frame. Additionally, the feed-forward control compensating for the load current, which can be considered a disturbance of the voltage controller, can be used to improve the disturbance rejection performance. However, during the parallel operation of UPSs, circulating current can occur between UPS modules when performing both feed-forward control and droop control because feed-forward control reduces the circulating current impedance. This study proposes a feed-forward compensation technique that considers the impedance of circulating current. An additional feed-forward compensation technique is developed to enhance the disturbance rejection performance. The validity of the proposed feed-forward compensation technique is verified by the experiment results of the parallel operation of a 500 W double-conversion UPS module.

• 한국가금학회지
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• 제8권1호
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• pp.25-30
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• 1981

This study was conducted to find the method that the least-cost formula can be determined thus allowing a better keeping of raw material supplies under the constraints having to be used some raw materials that are either in limited supply or for other reason in restricted use. In this study, it was considered that three kinds of feed were produced under limited supply of six kinds of raw materials, and data for the analysis were collected from a feed mill in southern part of Korea. According to the result of this study, it was proved better to determine the least-cost formula as the multi-mix problem than as the simple least-cost problem when more than two kinds of feed were produced wilt limited supply of raw materials.

• 한국생산제조학회지
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• 제19권5호
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• pp.631-636
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• 2010

SNCM420 steel is one of the cam shaft materials which are used in the supply unit for ship engine cam shaft. In this study the assessment of cutting behavior was conducted for the SNCM 420 steel and SM45C steel with various cutting conditions as depth of cut 0.5, 1.0, 1.5, 2.0mm and feed rate 0.1~0.3m/rev. The controlled chip was produced in feed rate 0.2, depth of cut 1.0 for SNCM420 and feed rate 0.2, depth of cut 2.0 for SM45C. There is no difference cutting force between SM45C and SNCM420 steels.

• 한국항해항만학회지
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• 제34권10호
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• pp.793-797
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• 2010

근해의 어족자원 고갈 및 수질오염은 수산양식 산업에 큰 영향을 미친다. 이러한 문제점을 해결하기 위하여 근해에서 외해로 양식장이 이동하고 있다. 외해 양식장은 근해보다 해상환경에 강인하게 개발되어야 하며, 안정적인 양식장 운영을 위해 원격 자동먹이 공급장치가 필요하다. 본 논문은 해상의 양식장에 적합한 원격 먹이공급시스템에 관하여 기술하고자 한다. 어류는 수온 및 어체 중량에 따라 먹이를 먹는 양이 변화한다. 해상 양식장의 경우 육상에 비하여 온도 변화가 크게 일어난다. 본 논문은 수온 및 어체 중량에 따라 먹이량을 계산하고 자동으로 먹이를 공급하는 시스템을 연구하였다. 모형을 활용한 먹이 공급 장치의 성능을 실험하였다.

• Membrane and Water Treatment
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• 제13권1호
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• pp.39-49
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• 2022

Seawater desalination is doubtlessly a viable option to supply fresh drinking water. Nevertheless, RO (reverse osmosis) desalination plants in specific areas may be intermittently operated to match the imbalance between water demand and supply. Although a handful of works have been done on other membrane systems, few studies have attempted to mitigate fouling in intermittent RO systems. Accordingly, the objectives of this paper were to examine the effect of the intermittent operation on RO fouling; and to compare four intermittent operation modes including feed solution recirculation, membrane storage in the feed solution, deionized water (DI) recirculation, and membrane storage in DI water. Results showed that intermittent operation reduced RO fouling under several conditions. However, the extents of fouling mitigation were different depending on the feed conditions, foulant types, and membrane lay-up methods. When the feed solution was recirculated during the lay-up, the restoration of the flux was less significant than that by the feed solution feed-up. The use of deionized water during the lay-up was effective to restore flux, especially when the feed solution contains scale-forming salts (CaSO₄) and/or colloidal silica.

• 한국컴퓨터정보학회논문지
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• 제12권2호
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• pp.265-279
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• 2007

본 연구는 배합사료업체와 고객기업(축산농가) 간의 거래관계에서 고객만족과 계속 재구매 의도(충성도)에 영향을 미치는 공급서비스 관행을 규명하였다. 공급서비스 관행들을 선행연구 고찰결과에 따라 기술적 품질의 공급서비스와 기능적 품질의 공급서비스로 분류하고 이들 각각이 고객만족과 계속 재구매 의도(충성도)에 어떠한 영향을 주는가를 실증분석을 하였다. 실증 분석한 결과 한국의 배합사료공급에 있어서 기술적 품질의 공급서비스는 고객충성도에 긍정적 영향을 주고 기능적 품질의 공급서비스는 고객만족과 고객충성도 모두에 긍정적 영향을 주는 것으로 나타났다.

• 한국가금학회지
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• 제30권3호
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• pp.169-175
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• 2003

동절기에 산란피크 기간의 대부분이 해당되는 육용종계 산란기의 적정 에너지공급체계를 구명하기 위하여 강원도 홍천군 북방면 소재 홍천종계에서 케이지 사양형태의 로스 육용종계 400수를 공시하여 2002년 10월부터 2003년 7월까지 40주간(24∼64주령) 표 3과 같은 4가지 에너지공급체계로 사양시험을 실시한 결과를 요약하면 다음과 같다. 1) 총 산란율, 종란 산란율 및 평균난중은 전반적으로 처리간에 유의적인 차이가 인정되지 않았고, 55∼64주령의 산란후기에만 처리간에 유의적인 차이가 있었으나 에너지 공급수준에 따른 일정한 경향은 없었다. 2) 사료요구율과 ME 요구량 및 사료비는 모두 1일 에너지공급량이 많아질수록 증가하는 경향을 보였고(P<0.05), CP 요구량은 처리간에 유의적인 차이는 있었으나(P<0.05) 일정한 경향은 보이지 않았다. 결론적으로 1일 ME 공급량을 24주령에 280 kcal로부터 30∼34주령에 400 kcal까지 증가시키고 35주령 이후 380 kcal를 공급하여 전반적인 에너지공급량이 가장 적었던 Tl처리가 산란능력에 지장 없이 사료요구율과 ME요구량 및 사료비를 낮출 수 있었다.