• Korean Journal Plant Pathology
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• v.14 no.3
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• pp.220-222
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• 1998

In 1995, we collected stock (Matthiola incana) plants causing mosaic symptoms on leaves and color breakings on flowers in Daekwallyong, Korea. Two viruses were isolated from the infected plants, and identified as cucumber mosaic virus (CMV) and turnip mosaic virus (TuMV) by experiments of host range, serology and electron microscopy. Each of the virus did not produce the same symptoms on the stock seedlings as naturally infected plants caused. When the viruses were coinoculated to the stock seedlings, however, severe mosaic symptoms were observed on leaves, and then the color breakings were expressed on flowers.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.729-730
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• 2008

Recently, contactless power transfer system is widely used in many industry applications such as automated guided vehicles and medical applications. In this paper, we derived electrical parameters and analyzed output characteristics of contactless power transfer device with resonant converter for levitation / propulsion system. And, the characteristics analysis results are satisfied with output required specifications of analysis model.

• Korean Journal Plant Pathology
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• v.11 no.1
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• pp.87-90
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• 1995

Complementary DNA of the movement protein (MP) gene of tobacco mosaic virus Korean pepper strain (TMV-KP) was synthesized from purified TMV-KP RNA by using the reverse transcription and polymerase chain reaction (PCR) system. The synthesized double stranded cDNA was cloned into the plasmid pUC9 and transformed into Escherichia coli JM110. The movement protein gene of TMV-KP of the selected clones was subjected to sequence analysis by Sanger's dideoxy chain termination method. The complete sequence of viral MP gene from TMV-KP strain was 807 nucleotides long. The nucleotide of MP gene from TMV-KP has thirteen and two nucleotide differences from TMV vulgarae (TMV-OM) and Korean (TMV-K) strains, respectively. Thus, the nucleotide sequence of TMV-KP MP gene showed higher homology of 99% with that of TMV-K MP gene.

• Korean Journal Plant Pathology
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• v.11 no.1
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• pp.80-86
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• 1995

The cDNA of CMV-As satellite RNA was introduced into tobacco plants (Nicotiana tabacum cv. Samsun NN) using a binary Ti plasmid vector system of Agrobacterium tumefaciens. The cDNA of satellite RNA introduced into tobacco plants was detected by polymerase chain reaction (PCR) and molecular hybridization analyses. Symptom development was distinctly suppressed in the transgenic tobacco plants when inoculated with CMV-Co. CMV concentration in the transgenic tobacco plants was decreased to 1/40 of non-transgenic tobacco plants. The kanamycin resistance gene of the transgenic tobacco plants was also detected in the progeny.

• Korean Journal Plant Pathology
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• v.10 no.2
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• pp.136-139
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• 1994

Turnip mosaic virus (TuMV) was isolated from Rorippa islandica showing mild mosaic symptom in growing field of Chinese cabbage and radish. Identification of the virus was based on host range, transmission by aphids, electron micrograph, serological reaction and hybridization detection. The virus systemically infected on Chenopodium quinoa, Nicotiana clevelandii, N. glutinosa, Brassica rapa, B. campestris subsp. pekinensis and Raphanus sativus, whereas showed local infection on C. amaranticolor, Gomphrena globosa and Tetragonia tetragonoides. The virus was transmitted by aphid (Myzus persicae). The virus particle was filamentous with 720$\times$12 nm in length, and reacted positively with an antiserum of TuMV in agar gel double duffusion test. In slot-blot hybridization using the digoxigenin(DIG)-labeled RNA probe, TuMV-RNA could be detected in sap of R. islandica infected with the virus. This is the first report of a natural infection of that virus on R. islandica.

• Korean Journal Plant Pathology
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• v.14 no.6
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• pp.636-641
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• 1998

Digoxigenin (DIG) was used to prepare nucleic acid probe for the detection of RNA of potato leafroll virus (PLRV) in the potato leaf extracts. The 0.6 kb coat protein (CP) gene cDNA of PLRV in plasmid pSPT 18 vector was labeled with digoxigenin by in vitro run-off transcription and then used for cRNA probe. In the several buffers tested for increase the total RNA extraction efficiency AMES buffer was the most suitable for this detection method. The RNA extracts from potato leaves shown symptoms of PLRV were dot blotted onto nylon membrane and hybridized with labeled RNA probes. After hybridization, labeled RNA bound to PLRV RNA on membrane was detected with anti-digoxigenin alkaline phosphatase. 5-bromo-4-chloro-3-indolyl-phosphate/nitroblue tetrazolium (NBT) salt and CSPD were used as substrate for colorimetric and film exposure detection, respectively. These detection methods were very sensitive allowing for detection of 1/32 diluted total RNA extract from 100 mg leaf tissue.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 1997.11a
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• pp.107-110
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• 1997

OFDM 방식을 다중 반송파 변조방식(Multi-Carrier Modulation)의 일종으로 다수의 부반송파를 이용하여 전송신호를 병렬로 전송하는 방식이다. OFDM 시스템에서는 심볼간의 간섭을 줄이기 위해 보호구간을 삽입하여 송신한다. 이 보호구간은 유효 데이터 구간의 일부분을 복사하여 신호의 앞부분에 첨가하는 것으로 복조에 사용되지 않는 여분의 신호이다. 수신된 OFDM 신호를 복조하기 위해 FFT를 사용하는데 FFT의 입력에는 보호구간을 제외한 유효 데이터 부분만을 이용해야 한다. 이 때 보호구간 제거를 위해 사용되는 것이 FFT 윈도우이다. 이 논문에서는 반송파 주파수 옵셋의 영향을 받지 않는 대략적인 FFT 윈도우 위치 복원에 대한 알고리즘을 제안하고 AWGN과 20개의 다중경로 채널 환경에서 컴퓨터 모의 수행으로 성능을 평가하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.11a
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• pp.228-231
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• 2017

최근 랜섬웨어 같은 치명적 신 변종 사이버공격에 의한 경제적 피해가 심각해지고 있는 실정이며, 취약 홈페이지에 대한 위 변조 공격은 사용자 PC의 악성코드 감염 경로로 활용되고 있다. 본 연구에서는 소스코드, 이미지 및 키워드 등 3가지 방식의 홈페이지 위 변조 검증을 수행하고 해당 결과를 블록체인 기반으로 관리하여 데이터의 투명성 보안성 안정성을 확보할 수 있는 프레임워크를 제시하고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04b
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• pp.837-840
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• 2002

본 논문에서는 해쉬 함수를 바탕으로 한 메시지 인증 코드 중의 하나인 MD5 를 하드웨어로 설계하였다. MD5 는 block-chained digest 알고리즘으로 64 단계의 동일한 단계 연산 구조를 가지므로 가장 기본적인 연산 한 단계를 구현하여 반복적으로 수행하는 구조로 설계하였다. 단계 연산구조 내에서는 연속된 32bit 덧셈 연산이 이루어지는데 기존의 CLA(carry-lookahead-adder)만을 사용하여 구현한 구조 대신 본 논문에서는 CSA(carry-save-adder)와 CLA 를 혼용하였다. 덧셈연산의 결과는 순서와 상관없기 때문에 연산자의 덧셈 순서를 리스케줄링 하였으며, 이는 기존의 CLA 만을 이용한 방법과 비교하여 최장지연 경로를 15% 줄여 훨씬 빠르게 연산을 수행하고, 전체 면적도 30%를 줄일 수 있었다. 결과적으로 본 논문에서 제안하는 구조는 지금까지 나온 어떤 MD5 프로세서 보다 작고 빠른 프로세서를 구현 할 수 있을 것으로 판단된다.

• Proceedings of the KIEE Conference
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• 2005.10c
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• pp.138-140
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• 2005

This paper deals with inductance profile of linear switched reluctance motor. Inductance profile of LSRM calculate at align and unalign position using analytical method. Analytical method of this paper used space harmonics method, Also, analysis result compares with data that is derived through an experiment, and proved validity.