• Food Science of Animal Resources
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• v.23 no.3
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• pp.221-226
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• 2003

This study investigated the effect of different electrical stunning methods on pH, water holding capacity(WHC), cooking loss(CL), meat color and blood spot rate in broilers. One-hundred and forty broiler chickens were slaughtered by 50, 65 and 90 voltage with the same electrical frequency(255 Hz) and stunning time(5 sec) in commercial abattoir. The ultimate pH of leg muscle and WHC of breast muscle decreased with increasing the stunning voltage. However, there were no significant differences in ultimate pH, WHC and CL of breast muscle, and ultimate pH of leg muscle. Lightness(L*) and yellowness(b*) values of leg muscle stunned with 90V, 255 Hz, 5 sec were higher than those stunned with 50V, 255 Hz for 5 sec(p<0.05). But there were no significant differences in color value on skin, breast and wing muscle. Our experiments showed that change of stunning voltage affected some broiler meat quality parameters. However, further research is necessary to examine the effects of stunning condition on broiler meat quality.

• Korean journal of applied entomology
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• v.27 no.2
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• pp.103-110
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• 1988

The behavior and circadian rhythm of emergence, copulation and oviposition in the Oriental tobacco budworm (Heliothis assulta Guenee) were studied to obtain the following results. More than three quarters of adults emerged within 3 hours after the light-off. It took about 33 min for an adult to expand and tan its wings after emergence. Adult male showed a sequential pattern of mating behavior, such as antennal movement, wing elevation and vibration, exten¬sion of hairpencils, and tapping of female ovipositor leading to a copulation. However, adult female revealed a rather simple behavior, such as protraction and retraction of her terminal abdomen and vibration of wings. All of the mating took place during the early part of the scotophase, with the peak from 1 hr to 2 hrs after the light-off. But the mating peak in virgin females tended to advance with age. Adult females showed the highest rate of mating among 24 hr-olds and the rate declined with age. The rate of first matings in males gave a very similar pattern to that of females. The duration of copulation was $77\pm$14min. Oviposition occurred throughout the entire scotophase, with the peak during the first 2 hrs. The most nu¬mber of eggs deposited daily was seen on the 3rd day after the mating. Mating rate, number of eggs laid and longevity we~e compared under different sex ratio. Unmated adults lived longer than mated adults.

• Korean Journal of Environmental Biology
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• v.41 no.4
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• pp.519-529
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• 2023

The occurrence of eggs and adults of Pochazia shantungensis, Lycorma delicatula, and Lymantria dispar was investigated in 11 cities in the Chungcheongbukdo region. The results showed that the overwintering eggs of P. shantungensis occurred in 24.2% of the region in 2021 and 22.1% in 2022, while adults occurred in 25.2% in 2021 and 24.3% in 2022, indicating the highest occurrence among the pests studied. The occurrence of overwintering eggs of L. delicatula was relatively low, with 2.6% of the region affected in 2021 and 1.9% in 2022. Adult L. delicatula occurred in 3.2% of the region in 2021 and 3.6% in 2022. Overwintering eggs of L. dispar occurred in 4.1% of the area in 2021 and 1.7% in 2022, showing a decreasing tendency compared to the previous year, and their occurrence was only low to middle in terms of the degree of occurrence. Adult L. dispar occurred in 4.6% of the region in 2021 and 2.7% in 2022, showing occurrences that were insignificant compared to L. delicatula. According to a survey of host preferences, both the wintering eggs and adults of P. shantungensis were found in apples and peaches between 2021 and 2022. In both 2021-2022, adult L. delicatula had a high incidence in peaches, apples, and grapes, and winter eggs were the highest in grapes. However, the incidence in apples and peaches was low. A high incidence density of L. dispar moth adults and overwintering eggs was found in apples in both 2021 and 2022.

• Horticultural Science & Technology
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• v.33 no.6
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• pp.891-899
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• 2015

The lily symptomless virus (LSV) is the most common virus in Korean native lilies and causes various types of damage to overall plant growth. This study was carried out to investigate the elimination rate of the LSV by the in vitro scale culture (scaling) method in Korean native lilies and to test reinfection rates of the LSV under several field culture conditions of bulb production. Four Korean native lilies (Lilium dauricum, L. distichum, L. lancifolium, and L. maximowitzii) were used and their scales were cultured in vitro for micro-scale formation. The micro-scales were subcultured repeatedly using MS culture medium supplemented with 30 or $90g{\cdot}L^{-1}$ sucrose. The culture conditions were $24{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ PPFD with 16 hour daylength using fluorescent lamps and maintained at $22{\pm}2^{\circ}C$. The virus-free bulblets were grown for one to three years in the greenhouse and transplanted to the field in October or March. Virus infection rates were investigated by direct tissue blotting immunobinding assays and measurement of chlorophyll and protein contents. Virus-free plants could be obtained from the 5th subculture of micro-scales in L. lancifolium and L. maximowitzii or from primary culture in L. dauricum and L. distichum. LSV-free plants were reinfected during bulb production in the field. Reinfection rates were higher at older bulb ages and under higher planting density. The plants planted in October and at inland Gyeongsan had higher infection rates than those planted in March and at coastal area Pohang. The reinfection rate of L. maximowitzii was higher than those of L. dauricum and L. lancifolium. The LSV-infected plants had lower chlorophyll contents and unchanged protein contents compared to virus-free plants.

• 한국경영정보학회:학술대회논문집
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• 2007.11a
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• pp.508-517
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• 2007

본 사례연구는 한국정보사회진흥원에서 개발한 디지털콘텐츠의 표준식별체계인 UCI(Universal Content Identifier)를 (주)누리미디어 보유의 약33만 건 콘텐츠에 적용한 사례와 비즈니스 모델을 소개하고 있다. UCI란 '디지털콘텐츠의 유통활성화' 를 이룩하기 위한 목적으로 도입하는 기술로 개별 디지털콘텐츠에 식별기호를 부여하는 기술이다. 본 사업은 UCI코드 체계를 이용하여 콘텐츠 관리 시스템을 구축하는 것을 목표로 하고 있다. UCI-RA시스템 구축이후 기대효과로는 콘텐츠 제공과 관련된 업무에 인적, 물적 비용을 절감하고, 신규 콘텐츠 발굴 및 개발이 용이하도록 하였다. 또한 서비스 운영과정에서는 기 확보된 콘텐츠를 비즈니스화 하여 신규 수익창출의 모델로 육성할 수 있다. 한편 콘텐츠 소비과정에서는 콘텐츠 검색의 용이성 및 구매 용이성 증대를 통해 양질의 콘텐츠를 유통하는 것이다. 아울러 운영기업의 콘텐츠 등록 및 운영과정에서의 유료콘텐츠 정산주기율 단축, 콘텐츠 품질 고객만족도 제고 등의 효율성을 증가할 수 있다.

• Monthly Korean Chicken
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• v.63 no.57 s.123
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• pp.118-121
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• 2005

육계농장을 방문할 때마다 자주 듣는 이야기가 병아리가 층아리가 많다, 이번 파스는 적다라는 이야기다. 육계에서 층아리를 발생시키는 대표적인 질병이 흡수불량증후군이다. 흡수불량증후군은 빈혈이 도는 닭, 황색 분변, 장내용물고 분변내에 소화가 되지 않은 사료가 보이며 비정상적인 날개(헬리콥터병). 위축, 구루병, 대퇴골두괴사증, 근위염 등의 질병이 한가지 이상 또는 복합적으로 나타나는 질병으로 주로 육계나 백세미에서 증체 지연과 사료효율 감소 등으로 인한 피해를 일으키는 질병이다. 흔히 말하는 층아리 발병이 많게 되는 질병이라 하겠다. 이 병은 레오바이러스, 곰팡이 독소, 아데노바이러스, 엔테로바이러스, 파보바이러스, 혐기성 미생물과 여러 밝혀지지 않은 유전적인 요인까지 복합적으로 원인체가 작용하는 질병이다. 따라서 그 원인을 밝히기가 어려우며, 명확한 대책의 수립도 쉽지 않은 질병이다. 그러나 이 중에서 개연성이 높은 질병인 레오바이러스 감염증을 위주로 해결책을 찾아보기로 하겠다.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.20 no.4
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• pp.464-471
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• 2011

We tried to analyze sound field of the interior of housing installed with an impeller using the Boundary Element Method (BEM) with the Kirchhoff-Helmholtz integral equation. In order to increase the accuracy of our analysis, reverse engineering technology, which has been developed in recent years. We measured and treated geometrical data with 3D scanning of the practical research object. After modeling by the reverse engineering, we analyzed variation of the BPF as adding vibration frequency and variation of the sound field of the interior of housing by changing the number of impeller blades. We also tried an analysis of free degree variation. Then, we proposed the analysis accuracy and noise reducing method by analysis result.

• Proceedings of the KIPE Conference
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• 2004.07a
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• pp.137-140
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• 2004

풍력발전은 태양광발전과 더불어 대체에너지의 큰 축을 이루고 있는 대체에너지 시스템이다. 풍력발전은 축의 방향에 따라 수직축과 수평축 풍력발전으로 나뉘는데, 국내외 보급되고 있는 대부분의 시스템은 수평축 발전시스템이다. 이 시스템들은 3개의 날개를 가지는 블레이드를 사용하고 있다. 대용량으로 갈수록 블레이드의 크기는 커지고 시스템에서 발생되는 소음문제, 시스템 운용에서 오는 안정성 등 많은 문제들을 가지고 있다. 본 논문에서는 이러한 문제점들을 보완하고자 수직형 풍력발전시스템을 제안하였으며, 이를 위해 발전시스템의 주요 구성품인 수직형 특수 블레이드를 제안하였다.

• 한국전산유체공학회:학술대회논문집
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• 2010.05a
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• pp.464-467
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• 2010

Ice accretion on aircraft surface in icing condition induces external shape changes that may result in a hazard factor for aircraft safety. In case of aircraft main wing with high lift equipment, ice accretion is observed around leading edge and flap. During the design phase, location of ice accretion and associated aerodynamic characteristics must be investigated. In this study, icing effects on aerodynamic characteristics of the main wing section of KC-100 aircraft are investigated using an Eulerian-based FENSAP-ICE code in various icing conditions.

• Proceedings of the Korean Society For Composite Materials Conference
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• 2005.11a
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• pp.185-189
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• 2005

For the simultaneous measurement of strain and vibration signal, a fiber Bragg grating sensor system with a dual demodulator was proposed. One demodulator using a tunable Fabry-Perot filter could measure low-frequency signal such as strain and the other demodulator using a coarse wavelength division multiplexer could detect high-frequency signal such as vibration signal using intensity demodulation method. In order to measure strain and vibration of the composite main wing model under static loading a real time monitoring program was developed. Also using intensity demodulation of CWDM, sensitivity and resolution at high frequency vibration were evaluated.