• 대한전자공학회논문지TC
• /
• 제45권2호
• /
• pp.119-126
• /
• 2008

본 논문에서는 엔드론치형 구형도파관 어댑터 해석을 위하여 루프 결합 모델을 제안하고, 이를 토대로 입력 임피던스의 모드 해석식을 유도하였다. 구형도파관 내의 전파모드와 고차모드들에 따른 입력 임피던스의 영향을 분석하고, 설계변수에 대하여 고찰하였다. 또한 선행 연구에서 제안된 방식과 상용 해석 툴인 HFSS의 해석결과를 바탕으로 제안한 해석식이 타당함을 검증하였다. 제안한 엔드론치형 구형도파관 어댑터는 특성 임피던스 $50{\Omega}$을 갖는 동축선의 내부도체와 WR90 상용도파관내에서 길이가 17.6mm인 급전루프가 연결된 결합구조이다. 이러한 구조에서 앤드론치형 어댑터는 정재파비(VSWR)가 2.0이하인 기준에서 7.5GHz에서 10.6GHz 대역을 갖는다.

• 한국농업기계학회:학술대회논문집
• /
• 한국농업기계학회 2000년도 THE THIRD INTERNATIONAL CONFERENCE ON AGRICULTURAL MACHINERY ENGINEERING. V.III
• /
• pp.729-735
• /
• 2000

Moisture loss of fresh fruits and vegetables is a main cause of deterioration. It resulted not only in the direct quantitative loss, but also in change in appearance, texture and nutrition. To reduce the loss of moisture content during the distribution in the market, fresh products are packaged using plastic films. But, most of the fresh products are packaged manually in Korea. In order to minimize the labor requirement, the packaging machine for fruits and vegetables was developed and tested. Prototype was composed of film feeding unit, bag former, products feeding conveyor, film feeding roller, center sealer, end sealer and discharge conveyor. Green peppers, carrots and perilla leaves were tested with prototype. Prototype could pack 1780, 1390, 1780 bags per hour at the feeding speed of 0.08m/s respectively and 2250, 1810, 2640bags per hour at the feeding speed of 0.10m/s respectively. And packaging speed of green peppers and carrots was improved by 3.7 and 3.4 times compared with manual packaging. The packaging condition with the prototype was good and the products had almost no damages.

• Asian-Australasian Journal of Animal Sciences
• /
• 제9권5호
• /
• pp.563-566
• /
• 1996

Five crossbred heifers(Holstein Friesian $\times$ Hariana) aged about one year and average body weight 157.0 kg were used to observe the effect of UMLD with restricted amount of wheat straw (500 g/100 kg body weight) on body weight gain and nutrient utilization. After seven months feeding the animals were switched to a revival diet consisted of wheat straw and concentrate mixture, for an additional six months. Fortnightly body weights were recorded and metabolism trials were conducted at the end of the two experimental periods. Results indicated that the average daily gain were 57.0 and 413.3 g in two feeding systems. This showed a sub-optimum growth during UMLD feeding which was compensated when good quality revival diet was available. Though, the nutrients intake were significantly (p < 0.01) lower in UMLD feeding period as compared to revival diet feeding, but digestibility of all the nutrients were alike statistically. It can be concluded that UMLD with restricted amount of wheat straw can be fed as scarcity feed for a short period, without causing irreparable loss to the animals, provided sufficient feed nutrients are available after the scarcity period.

• 한국수산과학회지
• /
• 제49권5호
• /
• pp.600-606
• /
• 2016

The effects of feeding frequency on the growth, food consumption, body composition, and hematological response of the Korean rockfish Sebastes schlegelii were investigated for 77 days at ambient water temperatures (17.2-24.5℃) in a sea cage in Tongyeong, Korea. Three replicate groups of fish were hand-fed to satiation with a commercial diet in one of four different feeding frequency trials (one meal every 2 days, and one, two and three meals per day). At the end of the experiment, the mean weight gain, specific growth rate, and daily feed intake of fish fed one and two meals per day were significantly higher than those of fish fed one meal every 2 days or three meals per day. The feed efficiency of the fish fed three meals per day was significantly lower than that of the fish in the other groups. The glucose concentration of fish fed one meal every 2 days was significantly higher than that of the other groups. We conclude that the optimum feeding frequency for improving the growth of Korean rockfish weighing 100-200 g reared in sea cages is one meal per day under our experimental conditions.

• Journal of Animal Science and Technology
• /
• 제46권5호
• /
• pp.783-798
• /
• 2004

본 시험은 oil 첨가시 알팔파건초를 기질로 하여 반추위 내에서 유리된 지방산과 양이온이 결합하여 형성되는 지방산염, 반추위 발효성상 및 소화율에 미치는 영향에 대하여 살펴보고자 시험을 실시하였다. 면양 3두를 이용하여 $\circled1$ oil 무첨기구, $\circled2$ 대두유 7% 첨기구 및 $\circled3$ 옥수수유 7% 첨가구로 하여 3${\times}$3 라틴방각법으로 수행하였다. 면양에게는 알팔파건초와 농후사료를 70 : 30의 비율로 급여하였다. 위액은 오전사료 급여 전 1시간, 사료 급여 후 1, 3, 6 및 9시간째 채취하였다. pH는 사료급여 후 3시간까지 감소하다가 그 이후에는 증가하였다{P<0.0001). $NH_3$-N는 pH 와는 반대의 경향을 나타내었다(P<0.0001). 총 휘발성 지방산, acetate, propionate 및 butyrate의 농도에는 변화가 없었다. A/P 비율은 배양시간이 증가함에 따라 감소하다가 9시간에서는 사료급여 1시간 수준이었다{P<0.0001). 건물, total-N, 조섬유, 회분, 기용무질소물, NDF 및 ADF의 소화율은 차이가 없었다. FAS의 형성은 사료급여 1시간에 비하여 사료급여 후에 증가하였으며(P<0.05), 대조구에 비해 oil 첨가구가 높았다(P<0.05). 장쇄지방산이 주로 지방산염을 형성하였다. 그래서 oil 첨가가 반추위 발효특생과 소화율에 미치는 유해한 영향을 방지할 수 있었던 것으로 사료 된다.

• Asian-Australasian Journal of Animal Sciences
• /
• 제31권4호
• /
• pp.522-528
• /
• 2018

Objective: This study evaluated inclusion of buckwheat silage to the diet of growing lambs in terms of meat quality as compared to maize silage. Methods: Buckwheat, rich in total phenols (TP, 33 g/kg dry matter [DM]), was harvested at the end of the milk stage and ensiled in 40 kg plastic bags after wilting (294 g/kg silage DM). A total of 18 growing lambs ($21.6{\pm}1.2$) were individually fed isonitrogenous and isoenergetic total mixed rations (TMR) for 75 d that either contained buckwheat or maize silage at DM proportions of 0.50. At the end of feeding trail all lambs were slaughtered to assess carcass characteristics and meat quality. Results: Buckwheat silage increased (p<0.01) the DM intake of lambs as compared to maize silage, but had no effects (p>0.05) on live weight gain and feed efficiency. Carcass weight, dressing percentage, meat pH, water holding capacity, cooking loss, shear force ($kg/cm^2$), and total viable bacteria count of meat did not differ (p>0.05) between the treatments. However, TP content of meat increased (p<0.001) by feeding buckwheat TMR. Feeding buckwheat TMR also decreased (p<0.05) the b* values of meat. Conclusion: The results provide that buckwheat silage is palatable and could successfully include TMR of growing lambs with no adverse effects on performance, carcass and meat quality. Additionally, feeding buckwheat silage to lambs offers increased TP in meat.

• 펄프종이기술
• /
• 제34권5호
• /
• pp.70-76
• /
• 2002

Ten years ago most papermakers were convinced that a system needs to be voluminous and heavy for controllability and stability. In order to improve grade changing dynamics, the author of this paper began developing a compact papermachine wet end. The results have proven that compactness is beneficial even more broadly. Quoting Voith$^1$the trend is now the opposite - the systematic collecting and direct feeding of the individual water flows back into the system". In its gasless form this is actually covered by a POM Technology Patent.tent.

• 한국응용곤충학회지
• /
• 제43권1호
• /
• pp.21-26
• /
• 2004

아메리카잎굴파리의 내부기생봉인 Neochrysocharis formosa의 산란과 기주체액섭취 선호성을 조사하였다. N. formosa는 기주유충의 몸 뒤쪽에 대부분 산란하였다. 온도 조건에 따른 일산란수와 일기주체액섭취수를 조사한 결과 온도가 높을수록 증가하는 경향이었으며 15, 20, 25, 3$0^{\circ}C$에서의 산란수와 체액섭취수의 비율은 각각 0.5, 0.9, 1.0, 1.0이었다. $25^{\circ}C$ 항온조건하에서 N. formosa의 총산란수와 기주체액섭취수는 각각 176개 188.7개이었으며 산란수와 기주체액섭취수 비율은 0.9이었고 암컷 수명은 11.8일이었다. 산란과 기주체액섭취는 주로 아메리카잎굴파리 3령유층을 선호하였다.

• 전기학회논문지
• /
• 제60권9호
• /
• pp.1708-1714
• /
• 2011

AT feeding system of the electric railway system is installed every about 10km at between the feeder and catenary in parallel and the mid-point of the transformer is connected to the rail The supply voltage of this system is doubled than rolling stock voltage. So the voltage drop is smaller than usual. And the other merit of this system is the decreasing inductive disturbance to the communication line because of the reduced current in rail which runs reversed in a point of view of rolling stock. Also, ATP(Auto Transformer Post) is installed to reduce the voltage drop and to mitigate the inductive disturbance, but still now the proper distance between the ATP and AT feeding system is not established which ranges from 2 to 10[km]. The stable result of simulation(which is set that the end of the line AT is installed) to the voltage drop and inductive disturbance can not analyzes the effect to the supply system due to the ATP. This paper analyzes the effect to the system depending on the location of ATP by forecasting the voltage drop and inductive disturbance.

• Journal of Nutrition and Health
• /
• 제31권5호
• /
• pp.957-964
• /
• 1998

The study was undertaken to assess the degree to which subjects were compliant with a specific metabolic diet in a controlled outpatient feeding study. The study consisted of a two-week control period in which subjects consumed a control diet consisting of 38-40% fat, 18-20% protein, 40-42% carbohydrate, followed by a three-week experimental period during which each subject consumed the control diet plus one of the four fiber supplements(20g/4ay) assigned on a random basis on the trust day. All meals were prepared and eaten in a metabolic feeding laboratory, with the exception of Saturday and Sunday meals that were packed for take-out. Fifty-seven healthy adult men, aged 18-65 years participated in the study. Dietary compliance index(CI) defined as the percent deviation of actual consumption from the prescribed food's and unconsumed prepared foods. The CI reflected the additional 'non-prescribed foods' and unconsumed 'prescribed foods'. A CI was calculated for all subjects. A CI of 5% or more was defined as poor compliance. Overall, dietary compliance was substantially improved for the entire group over the course of the study. Significant increase in compliance far energy and macronutrient intake occurred between the baseline and experimental periods. Within a non-obese group, dietary compliance fir energy improved from 5.5% to 3.3% by the end of the study(week 1vs week 5, respectively, p<0.05). However, between non-obese and obese group, dietary compliance was not different. (Korean J Nutrition 31(5) : 957-964, 1998)