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  • Title/Summary/Keyword: 선 처리

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Improvement of UV Photoluminescence of Hydrogen Plasma Treated ZnO Nanowires (수소 플라즈마 처리된 산화 아연 나노선의 자외선 발광 특성향상)

  • Kang, Wooseung;Park, Sunghoon
    • Journal of the Korean Vacuum Society
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    • v.22 no.6
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    • pp.291-297
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    • 2013
  • ZnO nanowires were synthesized by vapor-liquid-solid (VLS) process using ZnO and graphite powders on the sapphire substrate coated with an Au film as a catalyst. ZnO nanowires had two prominent emission bands; i) near-band edge (NBE) emission band at 380 nm, and ii) a relatively stronger deep level (DL) emission band (INBE/IDL <1). In order for the ZnO nanowires to be utilized as an effective material for UV emitting devices, the photoluminescence intensity of NBE needs to be improved with the decreased intensity of DL. In the current study, hydrogen plasma treatment was performed to improve the photoluminescence characteristics of ZnO nanowires. With the hydrogen plasma treatment time of more than 120 sec, the extent of performance improvement was gradually decreased. However, the intensity ratio of NBE to DL (INBE/IDL) was significantly improved to about 4 with a relatively short plasma treatment time of 90 sec, suggesting hydrogen plasma treatment is a promising approach to improve the photoluminescence properties of ZnO nanowires.

Effects of Ozone Treatment and Gamma Irradiation on the Quality Properties of Dried-Spirullina and Dried-Sea Tangle Powders (오존처리와 감마선 조사가 스피루리나와 다시마 분말의 품질특성에 미치는 영향)

  • Byun, Myung-Woo;Yook, Hong-Sun;Kwon, Oh-Jin;Jo, Sung-Kee;Lee, Sung-Hee
    • Korean Journal of Food Science and Technology
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    • v.29 no.4
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    • pp.764-770
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    • 1997
  • For the purpose of improving hygienic quality of dried-spirullina and dried-sea tangle powders as raw materials of health food, the comparative effects of ozone treatment and gamma irradiation on the microbial and physicochemical properties were investigated. Gamma irradiation at 7.5 kGy resulted in sterilization of total aerobic bacteria, coliforms and molds below detective levels (<101CFU/gsample), while ozone treatment for 8 hr up to 18 ppm could not sufficiently eliminate the microorganisms of the samples. Physicochemical properties including compositions of fatty acid and amino acid, minerals, pH and natural pigments were not changed by gamma irradaition up to 10 kGy, whereas, ozone treatment caused changes in pH, TBA value, natural pigments and fatty acid compositions. Especially, ozone treatment markedly decreased unsaturated fatty acid of the samples.

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Typographical Analyses and Classes of Characters and Words in Optical Character Recognition (문자 인식에서 단어 간의 활자 인쇄선 위치 분석과 클래스 분류)

  • Jung Minchul
    • The KIPS Transactions:PartB
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    • v.12B no.3 s.99
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    • pp.337-342
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    • 2005
  • This paper presents a typographical analyses and classes. Typographical analysis is an indispensable tool for machine-printed character recognition in English. This analysis is a preliminary step for character segmentation in OCR(Optical Character Recognition). This paper is divided into two parts. In the first part, word typographical classes from words are defined by the word typographical analysis. In the second part, character typographical classes from connected components are defined by the character typographical analysis. The character typographical classes are used in the character segmentation.

Study on Network Throughput of Power Line Communication System in In-Building Network (전력선 통신 시스템의 구내 네트워크 데이터 처리량 연구)

  • Jang, Ho-Deok
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.14 no.1
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    • pp.43-47
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    • 2021
  • This paper investigates the network throughput of PLC (Power Line Communication) system in the in-building network. The OFDM (Orthogonal Frequency Division Multiplexing) modulation format and adaptive bit loading algorithm is used to minimize the effect of signal loss and noise on transmission performance in the power line channel characterized by frequency selective fading. The network throughput of the PLC system which consists of gateway and CPE(Customer Premise Equipment) PLC modem in the in-building network is measured by network performance measurement tool, iperf and analyzed according to the TCP (Transmission Control Protocol) window size.

Quality Evaluation of Ground Garlic and Onions Treated with Chemical Fumigants and Ionizing Radiation (마늘 및 양파 분말의 품질에 대한 화학 훈증제와 감마선 처리의 비교 연구)

  • Kwon, Joong-Ho;Byun, Myung-Woo;Cho, Han-Ok
    • Korean Journal of Food Science and Technology
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    • v.19 no.2
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    • pp.107-112
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    • 1987
  • Comparative effects of ethylene oxide and gamma radiation treatment of the microbiological and physicochemical qualities of ground garlic and onions were investigated. The standard ethylene oxide cycle employed was substantially less effective in reducing microbial counts than were 7 and 10 kGy of gamma radiation, and was roughly comparable to 5 kGy. Effects of gamma radiation on pungency, nutrient and color were relativey small in comparison with ethylene oxide which adversely affected physicochemical properties. Sensory evaluation indicated that no significant difference was observed between the nontreated control group and 10 kGy irradiated smaples.

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Aroma Analysis by the Electronic Nose on Red Ginseng Powder Treated with Gamma Radiation, Methyl Bromide and Phosphine (전자코를 이용한 감마선, methyl bromide 및 phosphine 처리된 홍삼분말의 저장 중 향기패턴 변화 연구)

  • Shin, Jung-Ah;Kwon, Joong-Ho;Lee, Ki-Teak
    • Korean Journal of Food Science and Technology
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    • v.35 no.5
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    • pp.825-829
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    • 2003
  • An electronic nose was applied to analyze the aroma patterns of powdered red ginseng that had been treated with different preservative methods, such as gamma radiation at 5kGy, commercial methyl bromide (MeBr) and phosphine fumigations. Aroma patterns of phosphine or MeBr, fumigated samples were well separated according to storage temperature and period. However, 5kGy-irradiated samples (stored for 1 and 2 months) were hardly discriminated by the different storage temperatures (25C and 10C). After 5 months at 10C, non-treated and phosphine fumigated samples showed similar aroma patterns.

Effects of Gamma Irradiation and Ozone Treatment on Microbial Decontamination and Fatty Acid Compositions of Aloe and Pollen Powders (감마선과 오존처리가 알로에와 화분의 오염미생물 제거 및 지방산 조성에 미치는 영향)

  • Yook, Hong-Sun;Chung, Young-Jin;Kim, Jung-Ok;Kwon, Oh-Jin;Byun, Myung-Woo
    • Korean Journal of Food Science and Technology
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    • v.29 no.3
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    • pp.527-532
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    • 1997
  • The comparative effects of gamma irradiation and ozone treatment on the microbial inactivation and fatty acid composition were investigated for improving hygienic quality of aloe and pollen powders. Gamma irradiation at 10 kGy resulted in sterilizing total aerobic bacteria, molds and coliforms below detective levels, while ozone treatment for 8 hours up to 18 ppm did not sufficiently eliminate the microorganisms of aloe and pollen powders. The compositions of fatty acid were not significantly changed by gamma irradiation up to 10 kGy. However, ozone treatment markedly decreased unsaturated fatty acids by approximately 2080 in contents, whereas it significantly increased saturated fatty acids (p<0.05).

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Changes of Chemical, Bacteriological, and Allergenicity of Raw Milk by Gamma Irradiation (감마선 조사 처리에 의한 우유의 화학적세균학적 및 항원성 변화)

  • Noh, Yeong-Bae;Kim, Seung-Il;Kim, Hyeon-Su;Jeong, Seok-Geun;Chae, Hyeon-Seok;An, Jong-Nam;Jo, Cheol-Hun;Lee, Wan-Gyu;Ham, Jun-Sang
    • Journal of Dairy Science and Biotechnology
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    • v.23 no.2
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    • pp.93-98
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    • 2005
  • Effects of heat and gamma irradiation on chemical, microbiological, and immunological changes of raw milk were compared. Free fatty acid content of milk showed increasing tendency according to the increase of heating temperature and irradiation dose, and showed similarity in UHT (ultra high temperature) and 5 kGy irradiation. Total bacterial counts and coliforms were not detected after treatment of LTLT (low temperature long time), HTST (high temperature short time), UHT, and irradiation from 1 to 10 kGy in the milk with initial microbial load at 103 CFU/mL initially, but after 7 day storage, were not detected in UHT milk and that irradiated at 3 kGy or above. Heat treatment decreased (p<0.05) arginine, asparate, iso-leucine, lysine, and methionine content compared to raw milk while irradiation decreased (p<0.05) asparate, histidine, iso-luecine, leucine, and lysine content, which means irradiation could change primary structure of milk proteins. It was concluded that f kGy gamma irradiation treatment of raw milk could give a similar effect to UHT treatment in chemical and microbiological viewpoint, and may reduce allergenicity of raw milk.

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Effect of Electron Benm Irradiation on the Oxidative and Microbiological Stability of Ground Pork during Storage (전자선 조사가 분쇄 돈육의 저장 중 산화와 미생물적 안정성에 미치는 영향)

  • Koh, Kwang-Hwan;Whang, Key
    • Food Science of Animal Resources
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    • v.22 no.4
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    • pp.316-321
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    • 2002
  • Fresh ground pork was irradiated with the electron beam, and the microbiological and oxidative stability of ground pork was examined during refrigerated and frozen storage. During both storage, with the increase in the irradiation dose from 0 to 3.0 kGy, the inhibition effect of the growth of the total aerobic bacteria and the mesophiles also increased. Psychrotrophic bacteria were not detected at all in the whole experiment. On the other hand, electron beam irradiation promoted the oxidative rancidity of ground pork during refrigerated and frozen storage. The catalytic effect of oxidation was more pronounced with the electron beam dose of 3.0 than that of 1.5 kGy. As a result, the control of lipid oxidation must be achieved to fully utilize the sterilization effect of electron beam in the ground pork.

Multiresolution-Based Active Contour Model Using Genetic Algorithm (유전자 알고리즘을 이용한 다해상도 기반의 활성 윤곽선 모델)

  • Lee, Ki-Hwan;Yoo, Hyun-Jung;Kim, Hyun-Jun;Kim, Tae-Yong;Cho, Seok-Je
    • Annual Conference of KIPS
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    • 2009.11a
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    • pp.385-386
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    • 2009
  • 활성 윤곽선 모델은 스네이크 모델이라고도 하며 영상에서 물체의 경계를 검출하기위한 효과적인 방법으로 사용되고 있다. 본 논문에서는 초기 윤곽선 문제와 효과적인 경계선 검출을 위해 다해상도 기반의 유전자 알고리즘을 이용한 활성 윤곽선 모델을 제안한다. 입력영상의 해상도를 영상 피마리드 기법으로 저해상도로 축소시키고 초기 윤곽선을 설정한다. 설정된 윤곽선상의 연속된 두 좌표를 유전인자로 선택하고, 유전 연산자를 적용하여 물체의 경계를 찾아간다. 경계가 검출된 저해상도 영상을 단계적으로 확대하여, 보간될 영역의 국부적 활성 윤곽선 에너지를 계산하여 최소 에너지를 갖는 위치에 새로운 윤곽선 좌표를 삽입하여 경계를 형성한다. 제안된 방법은 초기 윤곽선의 위치에 상관없이 경계선을 검출했으며, 형태가 복잡한 물체의 경우에도 효과적으로 경계선을 검출하고 계산 복잡도를 감소시켰다.