• 한국컴퓨터정보학회논문지
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• 제27권1호
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• pp.33-41
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• 2022

본 논문은 유전체 기판 상에 설계한 평면형 마이크로스트립 패치 안테나를 기술하였다. 5세대 이동통신 적용을 위하여 2가지 타입의 평면형 마이크로스트립 패치 안테나를 연구하였으며 한 타입은 일반적인 마이크로스트립 구조이며 다른 한 타입은 동축 프로브 급전의 적층된 마이크로스립 구조이다. 전자기적인 커플링 방식을 사용한 적층된 마이크로스트립 패치는 다층기판 구조에서 설계되었다. 본 논문에서 제안한 적층된 마이크로스트립 패치 안테나는 3.42GHz~3.70GHz 광대역의 5G 서비스 대역에서 양호한 결과를 나타냈다. 임피던스 대역폭(VSWR≤2)은 3.42GHz~3.78GHz에서 360MHz(10.28%)를 나타냈다. 본 논문의 적층된 마이크로스트립 패치 안테나의 설계를 통하여 5G 이동통신 중계 시스템에 적용가능성을 확인하였다.

• 한국조리학회지
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• 제14권4호
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• pp.55-66
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• 2008

This study investigated the rheological and sensory characteristics of pickle with frozen pine mushroom. P3(Developed pickle seasoning) was the best by preference among three kinds of pine mushroom pickle seasoning. For flavor and functionality, pine mushroom pickle was processed by using three kinds of method(P3-1: P3+cinnamon 10 g, P3-2: P3+licorice 10 g and P3-3: P3+licorice 5 g+cinnamon 5 g). As a result, the product from P3-3(P3+licorice 5 g+cinnamon 5 g) was the best preferred pine mushroom pickle. The pH value of P3-3 was 2.15, 42.9 degrees Brix, and its color value was L(54.65), a(-1.61), b(17.87). Its texture level was higher than that of other products, but it would be lowered on storage. Until the 28th day of storage, microorganisms in pine mushroom pickle seasoning were detected less than 30 CFU/mL.

• 한국동물위생학회지
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• 제34권4호
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• pp.429-439
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• 2011

This article described the comparison of a quick, easy, cheap, effective, rugged and safe (QuEChERS) sample preparation and the classical method established by National Veterinary Research and Quarantine Service (NVRQS) for the determination of pesticide residues in livestock products using GC-tandem mass spectrometry. The classical method by NVRQS used liquid-liquid partioning followed by evaporizing. The modified QuEChERS entailed extraction of 2 g sample with 15 ml acetonitrile containing 1% acetic acid followed by addition of 6 g anhydrous magnesium sulfate and 1.5 g sodium acetate. After centrifugation, 6 ml of the extract underwent a cleanup step (in a technique known as column-based solid phase extraction) using 400 mg each of $C_{18}$ and primary secondary amine sorbents plus 1,200 mg magnesium sulfate. The quantitation of individual pesticides by both methods was based on tissue standard calibration curves with a correlation coefficient in excess of 0.98 for the 24 pesticides. The detection limits by the classical method were ranged 1.3~5.0 ${\mu}g$/kg, with mean recoveries between 76.2% and 114.3% except aldrin (59.3%) and deltamethrin (63.6%). The detection limits by modified QuEChERS were ranged 0.3~6.2 ${\mu}g$/kg, with mean recoveries between 68.0% and 114.3% except dimethipin (152.6%), chlorfenvinphos (138.1%), 4,4-DDT (61.5%), aldrin (60.4%) and chinomethionate (30.3%).

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송∙미디어공학회 2022년도 하계학술대회
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• pp.1294-1296
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• 2022

최근 재난에 신속하게 대응하기 위하여 통신망을 이용한 긴급재난문자 시스템에 관한 관심이 증가하고 있다. 기존 LTE 기반의 긴급재난문자 서비스는 한정된 자원으로 인해 시스템의 한계가 있으며, 이를 해결하기 위해 5G 이동 통신 서비스 기반의 긴급재난 문자 서비스를 고도화하기 위한 연구가 수행되고 있다. 본 논문에서는 5G기반 긴급재난문자 서비스의 성능 검증을 위하여 송출권역 구분, 재난문자 길이, 다국어 지원에 대해서 시험한 결과를 분석하고, 5G 환경에서 고도화된 긴급재난문자 서비스를 검증하기 위한 서비스 시나리오를 정의한다.

• 대한수의학회지
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• 제39권5호
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• pp.1021-1027
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• 1999

This study was carried out to determine the effects of ${\beta}-carotene$ on the control of mastitis in dairy cows during the dry period. The relationship between the levels of plasma ${\beta}-carotene$ and the status of udder health in Holstein dairy cows were investigated. Blood samples were collected from 117 cows to compare the levels of plasma ${\beta}-carotene$ in lactating cows. The levels of plasma ${\beta}-carotene$ were $1.82{\mu}g/ml$ in healthy cows(n = 65) and $1.12{\mu}g/ml$ in mastitic cows(n = 52), respectively(p < 0.01). In the experiment to compare the level of plasma ${\beta}-carotene$ in the cows at different stages of lactation, the plasma ${\beta}-carotene$ levels were $1.73{\mu}g/ml$ in lactating cows(n = 22), $1.29{\mu}g/ml$ in nonlactating cows(n = 35) and $0.43{\mu}g/ml$ in cows after calving(n = 16)(p < 0.05).

• 한국동물위생학회지
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• 제21권2호
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• pp.141-148
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• 1998

Eighteen strains of Clostpidium perfringens were isolated from the piglets with hemorrhagic enteritis. The characteristics of the outbreaks, clinical signs and lesions were examined. The biochemical properties, type of toxins and susceptibility to antimicrobial agents against the isolates were investigated. 1. The incidence of diarrhea was appeared in 97(22.4%) of 432 piglets examined. 2. The isolation rate of Cl perfingens from the 97 diarrheal faeces were 18.5%(18 strains) 3. The population of Cl perfingens in feces were ranged $10^{8-9}$cfu/g in 5(32.5%) and $10^{3-7}$cfu/g in 13(67.4%) of 18 samples. 4. The toxin type of the 18 isolates investigated by mouse inoculation test was all type C strains of Cl perfringens. 5. As a results of antimicrobial susceptibility test, 18 isolates were higly susceptible to cephalothin, tetracycline and penicillin.

• 한국균학회지
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• 제41권3호
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• pp.167-171
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• 2013

구기자 잎의 이용 범위 확대를 통한 폐기처리 비용 경감과 구기자 잎 약리효능의 부가적 이용 등을 목적으로 구기자 잎의 첨가가 전통 막걸리의 품질과 항고혈압활성에 미치는 영향을 조사하였다. 먼저 구기자 잎 막걸리 제조용 최적 효모를 선발한 결과, 우수 알코올 발효 효모로 시판 Saccharomyces cerevisiae F-1을 최종 선발하였다. 최적 알코올 발효조건을 검토한 결과 먼저 증자 멥쌀 120 g을 끓는물 100 mL로 호화시킨 후 시판 JJ곡자(300 sp) 60.5 g과 위에서 선발한 Saccharomyces cerevisiae F-1 활성액 5%를 첨가하여 $30^{\circ}C$에서 2일간 발효시켜 밑술을 제조하였다. 여기에 다시 증자 멥쌀 150 g과 찹쌀 100 g, 담금용수 500 mL을 혼합한 다음 구기자 잎을 증자미의 0.1%를 첨가하여 $25^{\circ}C$에서 5일간 발효시켜 여과했을 때 기호도가 우수하면서 항고혈압성 안지오텐신 전환효소 활성이 55.4%로 비교적 높은 구기자 잎 막걸리를 제조할 수 있었다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권1호
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• pp.343-364
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• 2021

In the 5G era, the communication networks tend to be ultra-densified, which will improve the accuracy of indoor positioning and further improve the quality of positioning service. In this study, we propose an indoor three-dimensional (3D) dynamic reconstruction fingerprint matching algorithm (DSR-FP) in a 5G ultra-dense network. The first step of the algorithm is to construct a local fingerprint matrix having low-rank characteristics using partial fingerprint data, and then reconstruct the local matrix as a complete fingerprint library using the FPCA reconstruction algorithm. In the second step of the algorithm, a dynamic base station matching strategy is used to screen out the best quality service base stations and multiple sub-optimal service base stations. Then, the fingerprints of the other base station numbers are eliminated from the fingerprint database to simplify the fingerprint database. Finally, the 3D estimated coordinates of the point to be located are obtained through the K-nearest neighbor matching algorithm. The analysis of the simulation results demonstrates that the average relative error between the reconstructed fingerprint database by the DSR-FP algorithm and the original fingerprint database is 1.21%, indicating that the accuracy of the reconstruction fingerprint database is high, and the influence of the location error can be ignored. The positioning error of the DSR-FP algorithm is less than 0.31 m. Furthermore, at the same signal-to-noise ratio, the positioning error of the DSR-FP algorithm is lesser than that of the traditional fingerprint matching algorithm, while its positioning accuracy is higher.

• 한국통신학회논문지
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• 제31권12B호
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• pp.1099-1111
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• 2006

최근 국내 주요 이동통신사들이 W-CDMA R5(HSDPA)망을 본격 상용화함에 따라, 이에 알맞은 새로운 3G 이동통신 접속료 산정방안의 조속한 도입에 대한 필요성이 제기되고 있으나, 이에 대한 체계적인 연구사례를 찾기 힘들다. 본 연구에서는 새로운 접속료 산정방안 도입의 타당성을 검증하기 위하여 3G 이동통신과 관련된 기술, 시장, 규제 측면에 대한 통합적인 분석을 수행한다. 연구결과, 합리적인 접속료 산정과 관련한 3G 망 특성상의 여러 가지 기술적 한계, 이동통신 시장의 발전속도의 가변성, 사전규제의 타당성 검증문제, 그리고 수집 가능한 해외사례 등을 고려했을 때, 즉각적인 원가기반 접속료 산정방안 마련 및 적용은 합리적이지 못하며, 해당 시장의 성숙 또는 All-IP망으로의 진화 이후로 접속료 산정방안 개선시기를 미루는 것이 효율적임을 제안한다.

• 동아시아식생활학회지
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• 제18권5호
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• pp.739-745
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• 2008

This study was conducted to determine the salt-intake from meals that were served by an institutional foodservice establishment for a month. Meals (176) were classified into 12 food groups by CAN Pro 3.0. These consisted of bap 6, mandu 5, guk 29, jjigae 9, jjim 4, gui 8, jeon 5, bokeum 25, jorim 16, fried 7, namul 49, pickled 12. The average salt content of 100 g of each menu item was significantly higher in the order of pickled>jorim>bokeum>gui>namul>jeon>jjigae>jjim>fried. The average salt and sodium contents of 1 potion of menu item was significantly higher in the order of jjigae>mandu>guk>bap>jorim>pickled>bokeum>gui>fried>jjim>gimchi>namul>jeon. The average salt contents of kim-chijjigae (6.05 g), eggjorim (7.01 g), cooked namul (2.78 g) and salted pepperleaves (4.67 g) was higher than that of the other menu items served frequently in the establishment. The average intake of salt and sodium was 23.48 g (sodium 9,310 mg) a day, 7.35 g (sodium 2,960 mg) with breakfast, 7.55 g (sodium 2,990 mg) with lunch and 8.33 g (sodium 3,300 mg) with dinner. The daily salt intake was slightly higher than that of DRIs (Dietary Reference Intakes).