• Journal of Positioning, Navigation, and Timing
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• 제9권2호
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• pp.65-70
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• 2020

For a wireless communication system, the angle-of-arrival (AOA) of the signal has a variety of applications. The signal AOA is estimated utilizing various antenna array structure such as Uniform Linear Array (ULA), Uniform Rectangular Array (URA), and Uniform Circular Array (UCA). In this paper, we introduce a cascade AOA estimation algorithm based on the UCA, which is consisted of CAPON and Beamspace MUSIC. CAPON is employed to estimate approximate AOA groups including multiple AOA signals and Beamspace MUSIC is employed to estimate detailed signal AOAs in the estimated AOA groups. In addition, we provide the computer simulation results for verifying and analyzing the performance of the cascade AOA estimator based on UCA.

• 한국임상수의학회지
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• 제35권4호
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• pp.170-173
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• 2018

A spayed female domestic short-hair cat of unknown age was admitted with a large proliferative mass in the face. Cytology and biopsy results suggested infection with Cryptococcus spp. A latex cryptococcal antigen agglutination test and an ALPHA cryptococcal antigen enzyme immunoassay yielded positive results. Results of canavanine-glycine-bromothymol blue agar test, serotyping and molecular typing by URA5 - RFLP and MLST analysis identified the isolates as C. neoformans var. grubii VNI/ST31. Two other cats were also diagnosed with the same methodology showing Crytococcosis with VNI/ST31. Cats presenting with facial or respiratory signs should be assessed for cryptococcosis in Korea.

• Asian-Australasian Journal of Animal Sciences
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• 제4권2호
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• pp.161-164
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• 1991

A rapid and accurate method is described for the determination of nucleo-bases in rumen micro-organisms. A procedure to satisfactorily hydrolyse the micro-organisms involving reaction with a mixture of readily volatile organic acids (acetic and formic acids) under high pressure, is proposed, and optimal conditions for an analytical procedure with reversed phase HPLC is described. The following nucleobases contents (mmol/kg DM) of rumen micro-organisms were found: Adenine (Ade), 82.62; Guanine (Gua), 61.34; Cytosine (Cyt), 84.61; Thymine (Thy), 35.74; Uracil (Ura), 68.62; Hypoxanthine (Hxn), 13.06; Xanthine (Xn), 8.35. Total purine-N content (g/kg N) of rumen micro-organisms were 99.60. The nucleic acid N content (g/kg N) of microbial isolates were: RNA-N, 109.9; DNA-N, 50.9.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1998년도 Proceedings ICPE 98 1998 International Conference on Power Electronics
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• pp.264-269
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• 1998

A proposed soft-switching buck-boost PWM converter has a lot of advantages, Viz., electric isolation, a high power factor, low switching losses, low EMI noise, reduction of the voltage and current stresses, etc. In a new PFC converter, the switching device is replaced by the loss-less snubber circuit to achieve the zero voltage switching (ZVS) at the maximum current. However, the charging current of the capacitor in the loss-less snubber circuit distorts the input current waveforms. To improve the input current waveform, a new duty factor control method is proposed in this paper.

• 한국통신학회논문지
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• 제41권12호
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• pp.1748-1751
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• 2016

본 논문에서는 휘어지거나 굴곡진 array인 3차원 conformal array의 beam pattern을 보정하고자 interpolation technique을 3차원으로 확장하여 3-D uniform rectangular array(3-D URA)에 적용하는 방법을 연구하였다. 시뮬레이션 결과는 2차원 interpolation 결과보다 매우 우수한 특성을 보여준다.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1996년도 International Conference on Agricultural Machinery Engineering Proceedings
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• pp.999-1008
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• 1996

The development and improvement of the originally designed direct rice sowing machine were carried out for the specific purpose of saving labor and increasing the efficiency of field operations in rice cultivation in the northern part of Japan. the prototype super wide spreader has a unique mechanism which propels rice seeds by compressed air and spreads them from the pivoting nozzle while the machine is in motion. The effective field capacity of sowing operation is about 6 ha/h. This spreader can also handle granular chemicals such as fertilizers, herbicides, pesticides and insecticides.

• Environmental Analysis Health and Toxicology
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• 제21권1호
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• pp.21-26
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• 2006

본 연구는 DNA 상해유도기작을 규명하기 위하여 하등 진핵생물인 분열형 효모 Schizosaccharomyces pombe로부터 subtraction hybridization방법을 이용하여 자외선 유도 유전자인 UV150과 UV200을 분리하고 그 유전자 구조와 발현양상을 조사하였다. 분리한 유전자의 발현양상을 Northern hybridization 방법으로 살펴본 결과 자외선 조사 1시간 후부터 발현이 증가되었다. 또한 알킬화제인 Methyl Methanesulfonate (MMS) 처리에 의해서도 발현이 증가되었다. 이 결과 다른 UV-inducible유전자와는 다르게 분리한 UV150유전자는 UV에 UV200유전자는 MMS에 의하여 발현이 증가됨을 알 수 있었다. 유전자의 기능을 알기 위하여 URA4 유전자를 이용하여 null-mutant 세포주를 제조하여 그 특성을 살펴본 결과 분리한 UV150 유전자는 세포의 성장에 필수적인 유전자임을 알 수 있었다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 ITC-CSCC -1
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• pp.387-390
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• 2000

This paper proposes an efficient and accurate power estimation method for Application Specific Instruction set Processors (ASIPs). Proposed method takes advantage of the data types of variables in application program to be executed on the ASIP. According to the experimental results, the efficiency of proposed method was more than 1000 times as high as that of conventional RTL based power estimation method, and the estimation error was within 10% compared to a conventional gate-level accurate power estimation method

• Macromolecular Research
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• 제11권1호
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• pp.42-46
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• 2003

Cell attachment and proliferation on the polymer films of triblock copolymer(ester-ether)s comprising po1y (L-1actide) (PLLA) and poly (oxyethylene-co-oxypropylene)(PN) were investigated using 3T3 fibroblasts. It was found that on the tissue culture polystyrene(TCPS) and the PLLA control film the cells could spread well while on the copolymer films the cells showed a rounded morphology without spreading and proliferated weakly. Especially, little cells proliferated on the films of copolymer having a LN composition of 20 wt%. While the water absorption of the copolymer films increased with increasing PN content, the contact angle against water of copolymer films immersed in aqueous medium was almost identical, being slightly lower than that of the PLLA film. These properties were compatible with the results of cell attachment. The in vitro hydrolysis of the films of triblock and multiblock type copolymers was faster with increasing PN content. The increased hydrolyzability, the flexibility and the decreased cell attachment suggested that these copolymers may have high potential as biodegradable materials for medical use.

• 한국양식학회지
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• 제8권3호
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• pp.209-220
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• 1995

미꾸라지의 간으로부터 핵을 분리하여, 저농도 염추출 및 제한효소 처리로 핵기질(nuclear matrix)을 분리하였다. 분리된 핵기질을 Proteinase K로 분해한 후, phenol-chloroform 추출로 크기가 약 0.3kb-15kb의 분포를 나타내는 핵기질 부착 DNA (nuclear matrix attachment regions : MARs)를 얻었다. 효모 URA 3 유전자를 가진 2.13 kb Eco47 III 단편을 제한효소 Ssp I 으로 절단된 pUC19 플라즈미드 벡타에 결합시켜, ARS (autonomously replication sequence) 클로닝을 위한 pURY19 플라즈미드 벡타를 만들었다. 이 pURY19 벡타는 Saccharomyces cerevisiae내에서 독립적으로 복제할 수 없기 때문에, 물고기의 효율적인 발현 벡타 개발을 위해, 이 system을 이용하여, S. cerevisiae내에서 독립적으로 복제 가능한 미꾸라지의 ARS를 클로닝하고자 하였다. 분리 된 MARs를 pURY19 벡타에 결합시 킨 다음, E. coli $DH5\alpha$에 형질전환시켜 $pURY19N_{l-62}$를 얻었다. MAR Libraries $(pURY19N_{1-62})$를 각각 $Ura^-\;S.\;cerevisiae$에 형질전환시켜, S. cerevisiae내에서 독립적으로 복제 가능한 M. mizolepis 유래의 복제원점들 (ARSs)을 분리하여, Sanger's dideoxy-chain termination method로 염기서열을 분석하였다. 염기서열 분석결과 모든 clones들은 AT-rich하였으며, 특히 $pURY19N_6$에는 ARS concensus sequence, Topoisomerase II consensus, near A-box, 그리고 T-box들이 존재하였다.