• 한국생명과학회:학술대회논문집
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• 한국생명과학회 2001년도 10주년 기념 국제학술 심포지움 및 추계학술대회
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• pp.95-95
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• 2001

• 한국생명과학회:학술대회논문집
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• 한국생명과학회 2001년도 10주년 기념 국제학술 심포지움 및 추계학술대회
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• pp.96-96
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• 2001

• Journal of Positioning, Navigation, and Timing
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• 제4권3호
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• pp.115-122
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• 2015

Global Positioning System (GPS) is used in various fields such as communications systems, transportation systems, e-commerce, power plant systems, and up to various military weapons systems recently. However, GPS receiver is vulnerable to jamming signals as the GPS signals come from the satellites located at approximately 20,000 km above the earth. For this reason, various anti-jamming techniques have been developed for military application systems especially and it is also required for commercial application systems nowadays. In this paper, we proposed a dual-channel Global Navigation Satellite System (GNSS) RF ASIC for digital pre-correlation anti-jam technique. It not only covers all GNSS frequency bands, but is integrated low-gain/attenuation mode in low-noise amplifier (LNA) without influencing in/out matching and 14-bit analogdigital converter (ADC) to have a high dynamic range. With the aid of digital processing, jamming to signal ratio is improved to 77 dB from 42 dB with proposed receiver. RF ASIC for anti-jam is fabricated on a 0.18-μm complementary metal-oxide semiconductor (CMOS) technology and consumes 1.16 W with 2.1 V (low-dropout; LDO) power supply. And the performance is evaluated by a kind of test hardware using the designed RF ASIC.

• 한국수산과학회지
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• 제42권1호
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• pp.73-77
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• 2009

Feeding habits of released Sebastes inermis obtained in daily and monthly collections from August 2007 to December 2007 in coastal waters off Jam Island in Jinhae Bay, Korea were assessed. A total 151 individuals of S. inermis (6.3-9.7 cm TL) were recaptured during the study period. Initial food intake of released S. inermis occurred within three days of released. Stomach content index increased with time, however, the percentage of stomachs devoid of contents decreased. Sebastes inermis mainly consumed gammarid and caprellid amphipods, gastropods and mysids. Diet also included small quantities of bivalves, shrimps, copepods and ostracods. Amphipods were mainly consumed at all size groups and consumption of gastropods, bivalves and shrimps increased with increasing fish size.

• 한국유체기계학회 논문집
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• 제16권3호
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• pp.48-53
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• 2013

Due to the urbanization, lots of people are living in cities. It is very convenient to live in the cities for the people but at the same time, the highly populated city has several environmental problems. During delivery process of large amount of municipal waste generated from the cities, the automobile emission and traffic jam have been occurred. The waste collection in the cities has been mainly done by using labour force and delivery truck. This is the conventional waste collection up to now. Recently, new technologies like automated waste collection system and capsule transportation have been introduced. Conventional waste collection mainly relied on the labour force and truck delivery does not need to invest a lot of money for the start-up. However, it requires to pay the operational cost both for the labour force and the truck delivery. On the contrary to this conventional waste collection, the automated waste collection and capsule transportation require high initial investment cost. However, the automated waste collection and capsule transportation can reduce significantly the pollutants emission, traffic jam by the waste trucks and actual waste collection cost per ton. In dealing with the waste collection in the cities, new waste collection technologies could be properly combined with the conventional waste collection for the effective municipal waste treatment.

• 전자공학회논문지
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• 제50권8호
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• pp.110-118
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• 2013

본 논문은 비행중인 유도탄을 원격으로 통제하기 위한 대역확산 방식의 무선통신 상향링크 개발에 대하여 기술하였다. 낮은 피탐성과 높은 항재밍 능력을 갖으며 비행체의 초고속 이동 및 페이딩에 의한 위상 또는 주파수 옵셋으로 인한 성능열화를 최소화하기 위해 대역확산 부분 DBPSK 변조방식을 사용하였으며 통신지연시간을 줄이기 위해 고속 디지털신호처리 알고리즘을 설계하였다. 또한 통신채널 장애의 주요 원인이 되는 멀티패스 간섭을 최소화하기 위해 복수의 수신안테나를 사용하여 선택적 다이버시티를 구현하였으며 추가적으로 터보코드를 에러정정부호로 사용하여 양질의 데이터를 수신할 수 있도록 개발하였고 비행시험을 통하여 성능을 확인하였다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 추계학술대회논문집
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• pp.278-280
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• 2007

This survey was carried out to provide a sound and a vibration level of bridges on the Han river. A sound and a vibration level of 6 bridges(Ban po, Cheon ho, Olympic, Jam soo, Young dong, Dong ho) were measured. The X-axis vibration level($L_{10}$) was $42{\sim}60$ dB(H), Y-axis vibration level was $41{\sim}52$ dB(H) and Z-axis vibration level was $44{\sim}77$ dB(V). The Z-axis vibration level($L_{10}$) on the midpoint of bridges was 68 dB(V), and on the joint point was 56 dB(V). The sound level was $77{\sim}84$ dB(A). The sound level of Jam soo bridge was higher than any other bridges.

• International Journal of Industrial Entomology and Biomaterials
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• 제9권1호
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• pp.89-93
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• 2004

A new silkworm variety, Kumhwangjam, with a sex-limited cocoon color for spring rearing season is F$_1$ hybrid between Jam 309, a Japanese race bred from Y1/9153, and Jam 310, a Chinese race from Y1/8586. In the local adaptability test performed at 8 local areas in spring rearing season of 2003, major characteristics of Kumhwangjam were mainly similar to those of the check variety Kumokjam. The new silkworm variety, Kumhwangjam, showed a sex-limited cocoon color: yellow for female and white for male with elliptical cocoon shape. This sex-limited cocoon color can be used as a valuable marker for discrimination between female and male for various purposes.

• 한국잠사곤충학회지
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• 제18권1호
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• pp.7-10
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• 1976

월년종의 냉장처리일수 및 인공부화에 따른 부화상태를 알고자 춘기채종 잠 103$\times$잠 104를 공시하여 1월하순에서 2월 중순에 걸친 시험에서 1월 하순경에 잠난은 휴면타파가 이루어 졌으나 5$^{\circ}C$ 냉장기간이 길어짐에 따라 휴면이 완전 타파되어 최청이 가능하다고 생각한다. 인공난화처리는 영기 비중 1.075 보다는 1.10이 변화에 좋은 영향을 미쳤으며 침지시간은 2분보다는 3분이 효과적이었다. 저온처리와 인공부화처리간에는 저온처리가 짧은 경우는 인공난화처리로서 부화에 효과적이나 반대로 긴 경우는 인공부화 양리량이 강할 수록 난 영산농도와 침지시간이 강할 수록 효과적이었다.

• International Journal of Industrial Entomology and Biomaterials
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• 제31권2호
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• pp.56-61
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• 2015

Rutin is an important bioflavonoid that is consumed in the daily diet. This study compared the functional components of rutin from various silkworm species using a gene database with those of rutin produced by silkworms selectively bred through cross-combinations. We made comparisons between the geographical origin and species of silkworm using a gene database and discovered that rutin activity was ranked in the following order by species, Chinese (C5)> miscellaneous varieties (Jamsaeng 1 Ho) >Japanese (Jam 115) > European (E58) >Korean (Sun 3 ho). However, rutin levels with respect to various genetic traits (blood color, silk color, and egg color) were consistent. In order to study rutin changes that occurred during the cross breeding of the silkworm gene, we bred cross-combinations utilizing Jam 115 and the 4051 silkworms. In conclusion, in order to provide information about the constituents of functional materials contained in silkworm powder, it is imperative that silkworm cross breeding occurs so that the database of functional materials extracted from silkworms will expand.