• 한국식물병리학회:학술대회논문집
• /
• 한국식물병리학회 1997년도 Proceedings of special lectures on Recent Research Trend of Plant Pathology
• /
• pp.5-21
• /
• 1997

Unique virus-like particles were associated with five eriophyid mite-borne plant diseases of unknown etiology; fig mosaic, redbud yellow ringspot, rose orsette, thistle mosaic, and high plains disease of corn and wheat. Quasi-spherical, double membrane-bound particles (DMPs), 120 - 200 nm in diameter, were observed in the cytoplasm of all cell types in symptomatic leaves of infected plants. No DMPs were observed in symptomless plants. The DMPs in symptomatic thistles were associated with two types of inclusions, electron-dense amorphous material and tubular aggregates. Similar amorphous inclusions were also found in corn and wheat with high plains disease, while tubular inclusions were observed in figs with mosaic symptoms. The particles and inclusions were similar in some aspects to immature particles associated with viroplasms of animal and insect poxviruses and also to the double-enveloped particles of tomato spotted wilt virus associated with viroplasms during early stages of infection, but were unique and unlike any known plant viruses. The DMPs and associated viroplasm-like inclusions in the high plains disease were specifically immunogold labeled in situ with the disease-specific antiserum. Thread-like structures, similar to tenuivirus particles, present in the partially purified virus preparations were also immunogold labeled with the antiserum. It is suggested that the thread-like structures are derived from the DMP. In many cells of symptomatic corn and wheat samples, DMPs occurred together with flexuous rod-shaped particles and cylindrical inclusions of wheat streak mosaic potyvirus (WSMV), suggesting that the disease is caused by a mixed infection of WSMV and the agent represented by the DMPs. Based on cytopathology, symptomatology and mite and/or graft-transmissibility, the five diseases described in this paper are potentially caused by virus(es) and the DMPs associated with these diseases may represent virus particles. If the DMPs are indeed viral in nature, they would comprise a new group of plant viruses.

• 한국자기학회지
• /
• 제15권5호
• /
• pp.292-297
• /
• 2005

원자력 발전소 증기발생기의 전열관은 전열면으로서의 역할과 방사능 차단벽의 역할로서 중요하며, 증기발생기 튜브의 폭발은 원자력 발전소 사고에 관계된다. 증기발생기 전열관 재료로는 Incone1600이 사용되고 있으며, 이 재료가 금속이면서 비자성이기 때문에 와전류 탐상법으로 전열관의 결함을 탐지하고 있다. 본 연구에서는 탐상 감도를 향상시키기 위하여 차등형 와전류 탐촉자를 개발하였으며, 개발된 차등형 와전류 탐촉자의 성능검사를 위해 Inconel600과 자기적 성질이 비슷하고 구하기 쉬운 SUS304로 가로 100mm, 세로 100mm, 그리고 두께 10mm인 평판에 선형결함과 원형결함을 가공하여 기준시편으로 제작하였다. 제작된 차등형 와전류 탐촉자를 사용하여, 자화주파수 50kHz, lift-off 0.4mm에서 직경이 0.25mm이고, 깊이가 0.2mm 크기의 결함까지 측정이 가능하였다.

• 한국가스학회지
• /
• 제16권5호
• /
• pp.28-34
• /
• 2012

보일러 튜브용 크롬강의 열화기구에 대해 고찰하였다. 크롬강의 열화는 경도 및 응력-파단 수명의 변화를 동반하는데, 이는 주로 탄화물 분해 거동에 의존한다. 그런데 2Cr강인 T22의 열화는 이러한 탄화물 거동에 따르지만 12Cr강인 X20의 열화는 마르텐사이트 래쓰 성장거동에 따르기도 한다. T22와 X20의 열화에 의한 경도값과 응력-파단수명 변화현상을 미세조직적인 측면에서 고찰하였다.

• 한국자원식물학회:학술대회논문집
• /
• 한국자원식물학회 2023년도 임시총회 및 춘계학술대회
• /
• pp.41-41
• /
• 2023

Red pepper (Capsicum annuum L.) is one of the most consumed vegetable worldwide. In this study, we tried to suggest the possibility of Cheongyang pepper as a functional cosmetic material by identifying the physiological activity, especially antioxidant and whitening effects of Cheongyang pepper through bibliometric analysis and experimental studies. A bibliometric analysis was performed through co-word analysis of 8,892 papers retrieved from SCOPUS. 4 research fields were obtained by cluster mapping from VOSviewer software, among which we noted the antioxidant activity of extracts from Capsicum annum L.. Phenol as a useful ingredient of Cheongyang pepper was analyzed using HPLC (high-performance liquid chromatography). Antioxidant and whitening effects were evaluated by measuring DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging activity, hydrogen peroxide scavenging activity, and tyrosinase inhibitory activity. Cheongyang pepper extract showed contents of 0.106 ± 0.01 and 0.105 ± 0.02 mg/g, respectively, in the order of gallic acid and protocatechuic acid. The extract exhibited 56.95% DPPH scavenging activity and 43.97% hydrogen peroxide scavenging activity at a concentration of 1,000 ㎍/ml. In addition, 1,000 ㎍/ml of the extract inhibited tyrosinase activity by 52.44% and 42.61%, respectively in a whitening efficacy test using L-tyrosine and L-DOPA (L-3,4- dihydroxyphenylalanine) as substrates. These results suggest that Cheongyang pepper extract and its active ingredients have antioxidant and whitening effects, and the possibility of future development as a whitening functional cosmetic material.

• 한국건설관리학회논문집
• /
• 제5권1호
• /
• pp.107-113
• /
• 2004

The advent of Radio Frequency Identification (RFID) technology has created new opportunities for improving the material management function in the construction industry and is starting to provide major improvements in the efficiency of the material management process. The objective of the research reported herein was to introduce the benefits of RFID technology on material management in the construction industry. RFID technology is discussed and various aspects of this technology are investigated. Potential RFID applications on material management proposed by Construction Industry Institute (CII) Breakthrough Strategy Committee (BTSC) and Fully Integrated and Automated Technology (FIATECH) are spelled out Finally, business analysis of RFID to estimate its impact is provided. It is concluded that there is a significant potential for improvement of material management function in the construction industry through the use of RFID.

• 아시안잔디학회지
• /
• 제11권3호
• /
• pp.161-166
• /
• 1997

This study was performed to develope the method of wildgrass to process as hydroseeding material which is a most popular revegetation method for Slope areas through the control of soil eroison and stability by seeding grasses. The wildgrass material for the processing were harvested at Suwon, Kyungki-do and Wonju, Kangwon-do in 1994. The investigations were established in laboratory for pot and field experiment with seven treatments by harvesting date and place in 1995. Results indicated that wildgrass harvested field in open space or road side was able to be used as hydroseeding material by proper processing. It was possible to substitute wildgrass seed to conrrnercial turfgrass seed, and plant tissue to mulching fiber by drying and crushing process. Germination of wildgrass seed was relatively slower than control (20g /$m^2$ turfgrass seed) in early stage of 20 days, but surface revegetation rate was higher in 50 days at wildgrass plot than control applied by normal hydroseeding method. Mixture of 5g /$m^2$ of cool season turfgrass seed to wildgrass material increased the rate of early stage of germination and surface revegetation. The application of wildgrass as hydroseeding material showed more naturalistic scenery than rutine hydroseeding with imported cool season turfgrass seed. Key words: Rydroseeding, Turfgrass, Wildgrass, Revegetation.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2012년도 추계 학술논문 발표대회
• /
• pp.205-206
• /
• 2012

In general, nuclear power plant concrete structure's performance has been very good with the majority of identified problems initiating during construction and corrected at that time. This study is experiments to improve drying shrinkage using glycol ether-based material for the durability of nuclear power plants. Thus, this study evaluated the obtained data from a mock up test for the practical use of concrete containing glycol ether. According to the results of this study, the concrete showed resistance performance of around 40% to drying shrinkage.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2004년도 추계학술대회
• /
• pp.85-89
• /
• 2004

The inner side between HP stationary blades in #1 turbine of Nuclear Power Plant A is damaged by the FAC(flow assisted corrosion) which is exposed to moisture. For many years the inner side is repaired by welding the damaged part, however, FAC continues to deteriorate the original material of the welded blade ring. In this study, we have two stages to verify the integrity of stationary blade ring in nuclear power plant A. In the stage I, replication of blade ring is performed to survey the microstructure of blade ring. In the stage II, the stress analysis of blade ring is performed to verify the structural safety of blade ring. Throughout the two stages analysis of blade ring, the stationary blade ring had remained undamaged.

• 산업공학
• /
• 제12권4호
• /
• pp.575-585
• /
• 1999

This study develops and operating software for a model plant. The model plant consists of an AS/RS system, two machining centers, an assembly line, and supplementary material handling equipments. Devices of each component are connected with the IBS RT24 DIO 16/16-T I/O module. Each I/O module communicates digital signals with the INTERBUS controller board via SUB-D 9 Connector cable. This study is a previous stage for developing an educational CIM software. Petri Nets is used for modelling the storage/retrieval of the AS/RS system, the flow of workpieces and the assembly line for parts. The operating software is coded with Microsoft Visual $C^{++}$ 5.0 and Interbus Library which is a software driver for the controller board. The operating software can be run on a MS Windows 95. Microsoft Access is used for the implementation of databases for BOM, AS/RS, and parts.

• Journal of Applied Biological Chemistry
• /
• 제60권1호
• /
• pp.29-33
• /
• 2017

The methanol extract of Rhododendron mucronulatum for. albiflorum (RMFA) stems inhibited aldose reductase (AR) activity. The RMFA fractions obtained by stepwise extraction with solvents of different polarity were tested for AR inhibition in vitro using the lens of a rat. Among them, the ethyl acetate (EtOAc) fraction inhibited AR more than the other fractions. Quercetin (1) from the EtOAc fraction showed a high AR inhibition with $IC_{50}$ of $2.11{\mu}M$. The stems of RMFA contained the highest amount (5.12 mg/g extract) of quercetin. Our results suggest that RMFA, which contained quercetin, could be a useful material for the development of supplementary functional foods.