• Journal of Biosystems Engineering
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• 제6권2호
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• pp.33-47
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• 1982

To modernize the conventional rice post production technology and reduce grain losses, a transition toward the wet-paddy threshing system has been strongly demanded. The head-feeding type thresher with pneumatic separation has been used dominantly for threshing dried-paddy, but some adverse effects in separation performance for threshing wet-paddy is encounterred. In order to solve the problems, the development of thresher with an additional oscillating sieve to the conventional pneumatic separation has been recommanded. This study was intended to evaluate the separating performance of thresher with oscillating sieve which was attached additionally to the conventional auto-thresher equipped with separation system of blower and suction fan. For different feed rates and rice varieties, wet-and dry-material were tested with threshers attached with and without oscillating sieve. Results of the study are summarized as follows: 1. When the feed rates were 480 and 640 kg/hr, there was no statistically significant difference in power reqirements between the threshers with and without an additional sieve device for both dry-and wet-threshing. However, when the feed rate was 960 kg/hr, power requirements of thresher without sieve were greater for wet-paddy threshing than the thresher with the additional sieve separator by about 20% points. 2. With additional oscillating sieve device, the ratios of total weights of whole grains including grains with branch let and damaged grains to the total output did not show statistical difference among the feed rates. However, with pneumatic separation the ratio was decreased as the level of feed rate increased. 3. The total amount of grains with branchlet (including broken panicle) increased with the moisture content. For both the wet-and dry-material threshing with the additional oscillating sieve, the percent of grains with branchlet to the total output decreased greatly as the feed rate increased. 4. The output of the damaged grains increased as moisture content decreased. Especially, for the dry-paddy threshing, the additional sieve separating device produced more damaged grains than the pneumatic separation at all feed rates. 5. Generally, for dry paddy threshing, the separating performance of the thresher with the additional sieve device was better at all feed rates, showing greater difference with increasing feed rates. 6. Separating losses were greater with the pneumatic than sieve separation for both the wet-and dry-threshing. 7. The overall comparison of separating performance of threshers tested with and without an additional sieve device showed that the former was more effective than the latter for the dry-material threshing. However, for the wet-paddy threshing, the separation performance with a sieve device was better than the pneumatic only when the feed rate was high.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2011년도 춘계 종합학술대회 논문집
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• pp.135-136
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• 2011

중소기업이 차지하는 국민경제에서의 고용창출 효과와 수출기여도 측면에서의 중요도는 매우 크다. 날로 높아져가는 세계시장의 글로벌화와 환경변화 속에서 무역의존도가 높은 우리나라 기업의 경우 제품 가격 유통 촉진 즉, 마케팅믹스 전략과 경쟁력이 수출성과 거양에 매우 큰 비중을 차지한다고 할 수 있다. 본 연구의 목적은 수출 중소기업의 마케팅믹스요인과 마케팅성과와의 관계를 분석하여 중소기업이 실행해야 할 최적의 마케팅전략을 제시하면서 수출마케팅과 중소기업정책 발전의 토대를 이루기 위함에 있다. 이러한 목적 달성을 위해 국내 338개 수출중소기업을 대상으로 설문조사를 실시하였고 AMOS 18.0을 이용하여 연구모형과 가설을 검증하였다. 실증 분석 결과, 마케팅믹스와 마케팅성과 관계에서는 4P's Mix요인 중 유통과 촉진관련전략이 마케팅성과에 유의한 영향을 미치는 것으로 나타났고, 제품 가격전략은 통계분석상 유의한 결과가 나타나지 않아 기각되었다. 따라서 향후 수출중소기업입장에서는 마케팅역량을 제고하기 위한 내부적이고 전사적인 노력이 선행되어야 수출마케팅성과가 더욱 극대화될 것으로 판단된다.

• 한국유체기계학회 논문집
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• 제17권5호
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• pp.43-53
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• 2014

This paper presents a the study on air curtain system of top and bottom bi-directional jet air discharge for blocking the spread of smoke in case of tunnel fire. The five kinds different air curtains of A, B, C, D, and E of models for various performance tested after manufactured. A results of the various performance test obtained the best efficiency from E model air curtain. And optimize the injection angle of the air curtain nozzle through the three-dimensional computational fluid dynamics (CFD) analysis and analyzed the effects of external pressure of tunnel. and also single factor design have been applied. At present, our attention is focused on the velocity distribution(flow width and flow position) of 1.5m on the ground in tunnel. Also, analyzed the influence of draft in the tunnel. Detailed effects of discharge angle of air curtain and velocity at nozzle exit are discussed.

• Asian-Australasian Journal of Animal Sciences
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• 제29권6호
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• pp.830-837
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• 2016

The purpose of this study was to investigate the effect of monochromic light-emitting diode (LED) light with different color on the growth and reproductive performances of white Roman breeder geese. A randomized complete batch design was utilized for the trial, and the replicate was regarded as one batch. Twenty ganders and fifty-five dames were used in batch 1 (started on 2011/6/17 and ended on 2012/1/31), thirty ganders and eighty-four dames were used in batch 2 (started on 2012/3/23 and ended on 2012/10/26), and thirty ganders and seventy-two dames were used in batch 3 (started on 2013/3/12 and ended on 2013/12/20). Two hundred and ninety-one geese were randomly assigned to 6 rooms in an environmentally controlled house. They were randomly allotted into one of three monochromatic light treatments: Blue, red, or white. The results showed that there was no significant difference in body weight among the three lighting groups at any point throughout the experimental period. However, compared to the blue light group, significantly more eggs were produced by the red and white light groups (p<0.05). Furthermore, the laying period of the red light group was significantly longer than that of other two groups (p<0.05). In conclusion, our results suggested that red LED-light has the best effect on reproductive performance (i.e. longer laying period and higher total eggs number) at 30 lux light intensity, and is therefore a better choice for the management of breeding geese than blue or white LED-light.

• Asian-Australasian Journal of Animal Sciences
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• 제21권8호
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• pp.1151-1158
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• 2008

This study was designed to examine the effects of different dietary protein levels on growth performance, nutrient utilization, amino acid (AA) digestibility and serum biochemical parameters of preruminant dairy calves. Fifteen healthy new-born calves were randomly allotted to three experimental groups and fed with different milk replacer that contained 18% (LP), 22% (MP) or 26% (HP) of protein. The results showed that final BW, net gain and ADG were significantly higher in the MP group than in LP and HP groups (p<0.05). In addition, the apparent digestibility of CP in the MP group was significantly higher than in the other two groups (p<0.05). The values of N intake and fecal N excretion were significantly increased following the increase of dietary protein content (p<0.05). However, in all three groups of animals, dietary protein content had no significant effect on urinary N concentration (p>0.05). BUN concentration, on the other hand, decreased as calves grew but increased following the increase of dietary CP content. Furthermore, no significant differences in digestibility of amino acids were observed among these three groups of animals (p>0.05). We concluded that calves fed with milk replacer containing 22% of protein had better growth performance and nutrient utilization as compared to animals treated with milk replacer containing either 18% or 26% of protein.

• 복식문화연구
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• 제28권4호
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• pp.463-479
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• 2020

The purpose of this study identify the types and characteristics of Hanbok worn in lunar new year parade and Korean parade in New York over the past three years. As for the research method, I first collected domestic news articles, overseas Korean news articles, and literature reviews about the history of the Korean parade in New York and the events of each year. Second, I conducted a case study on Hanbok worn in the six parades from 2017 to 2019 using photo data collected through direct surveys, 'YouTube' video footage and news article photos. Third, I interviewed people related to the New York parade about the route of buying and renting the Hanbok in the New York area. The types of Hanbok shown in the Korean parade in New York can be largely classified as ceremonial, performance, and daily costume. There were 65 ceremonial costumes in all, with men wearing Dallyeong (official's robe) and Gorlyongpo (dragon robe) and women wearing Dangui (woman's semi-formal jacket), Wonsam (woman's ceremonial robe), and Hwarot (princess's ceremonial robe). A number of performance costumes were also worn by the Chwitasu bands, Nongak ensembles and fan dancers. Finally, of the 210 daily Hanbok, most men wore Baji (pants) and Jeogori (jacket), and women wore Chima (skirts) and Jeogori. The parade attempts to showcase the beauty of Hanbok, but the costumes repeat year after year, which can feel monotonous to onlookers. This research can be used as a reference to effectively utilize Hanbok in future Korean cultural events.

• 대한기계학회논문집B
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• 제39권1호
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• pp.37-43
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• 2015

현열 뿐만 아니라 잠열을 이용하는 증발냉각은 배기열 회수에 매우 유용하게 사용될 수 있다. 본 연구의 목적은 증발냉각을 이용한 배기열 회수장치의 성능을 실험적으로 규명하는 것이다. 성능실험장치는 플라스틱 열교환기, 물 분무 노즐, 공기유동용 홴, 물 순환용 펌프, 수조, 온도 습도 유량 측정 센서 등으로 구성되었다. 증발이 없는 현열 회수에서의 유용도와 증발을 수반하는 전열 회수에서의 유용도를 여러가지 작동조건에서 측정하여 비교하였다. 현열냉각과 증발냉각의 유용도는 공기의 유량이 증가함에 따라 감소하고, 대향류에서의 유용도가 평행류에서의 유용도 보다 휠씬 높다. 증발냉각의 경우 물 유량이 증가함에 따라 유용도는 증가하고, 평행류가 대향류보다 물 유량에 더 민감함을 알 수 있다.

• 한국가금학회지
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• 제39권1호
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• pp.27-32
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• 2012

This experiment was conducted to investigate the dietary effects of turmeric powder (TP) on laying performances, egg qualities and its transfer into eggs. A total of two hundred, 60-wk-old, Lohmann Brown layers were divided into 4 groups, placed in to 5 replicates per group (10 layers each) and fed each one of four diets containing 0% TP (control), 0.10, 0.25 or 0.50% TP, respectively, for 7 wks. Egg production in the all groups fed diets containing TP were significantly higher than that in control (P<0.05). No differences in feed intakes, egg and eggshell qualities were observed among the treatments, but Roche color fan number (yolk color) in group fed diet with 0.5% TP was significantly higher than in control (P<0.05). In the groups fed diets containing TP, Haugh units after 2 wk of storage were significantly higher than that of control (P<0.05). The curcumin content of egg yolk in the groups fed diet containing 0.50% TP was significantly higher than those in the other groups (P<0.05). The cholesterol levels of egg yolk were not influenced by dietary TP. It was concluded that dietary TP was effective in improving laying performance and internal egg qualities. TP can be also used as a feed additive for the production of value-enhanced eggs with increased yolk color and curcumin content.

• 인터넷정보학회논문지
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• 제4권6호
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• pp.75-86
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• 2003

주기억장치 상주형 색인구조에서는 2차 캐쉬 실패가 성능에 매우 큰 영향을 미친다. 기존에 제안된 주기억장치 상주형 색인구조들은 2차 캐쉬 실패를 고려하긴 했지만 여전히 트리의 각 레벨을 접근할 때는 2차 캐쉬 실패가 발생한다. 본 논문에서는 이러한 문제점을 인식하고 트리 순회 시 각 레벨을 방문할 때도 캐쉬 실패가 발생하지 않는 주기억장치 색인구조를 제안한다. 제안하는 색인구조인 IpCSB+-트리는 다음 레벨에서 방문할 가능성이 있는 노드들을 프리페치하여 다음 레벨을 방문할 때도 캐쉬 실패가 발생하지 않도록 한다. 또한, 기본적인 구조는 노드그룹 개념을 이용하여 노드의 팬-아웃을 증가시키는 CSB+-트리에 기반하지만 CSB+-트리의 단점인 분한 비용의 증가문제를 해결하기 위한 방법을 제안한다. 성능평가를 통해 기존의 색인구조와 비교하여 제안하는 색인구조의 우수성을 보인다.

• 설비공학논문집
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• 제19권4호
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• pp.321-327
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• 2007

In an apartment house that is generally air-tight and well insulated, the combustion gas from cooking devices is the major source of air pollution in the kitchen. It spreads throughout the house affecting the overall Indoor all quality. In this study, the performance of the kitchen range hood which employs air induction and air curtain was investigated by numerical simulation. The results are compared with that of two other kitchen range hoods which are in general use. The two general types of range hoods considered in the present calculations are box and plate type range hoods. The former has a large capture space between the filter and suction duct, while the latter has little. It was found that the capture efficiency of the kitchen range hood with air induction and air curtain Is higher than that of the general types of range hoods by 20% approximately The reason may be because the air induction and the air curtain block the air stream escaping from the front and the side part of range hoods effectively and because an additional fan for air induction and air curtain increases suction flow rates.