• Title/Summary/Keyword: media quality

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Application of MALDI-TOF mass spectrometry-based identification of foodborne pathogen tests to the Korea Food Standard Codex (MALDI-TOF 질량분석기를 이용한 식품중독균 확인시험 적용)

  • Ha, Miyoung;Son, Eun Jung;Choi, Eun Jeong
    • Korean Journal of Food Science and Technology
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    • v.48 no.5
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    • pp.437-444
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    • 2016
  • Rapid and reliable identification of microorganisms is important to maintain food quality and to control safety. MALDI-TOF MS-based identification methods are relatively fast and simple compared to other conventional methods including gram staining and biochemical characterization. A colony on subcultured media can be directly prepared on the analysis plate without further complex treatments. In this study, we confirmed the applicability of MALDI-TOF MS-based identification of foodborne pathogens such as Salmonella Enteritidis/Typhimurium, Staphylococcus aureus, Vibrio parahaemolyticus, Clostridium perfringens, Listeria monocytogenes, Yersinia enterocolitica, Bacillus cereus, Campylobacter jejuni, Campylobacter coli, and Cronobacter sakazakii on the Korea Food Standard Codex. MALDI-TOF MS data of the pathogenic reference strains were incorporated into a commercial MicroID (ASTA Inc.) database. Other pathogenic reference strains and seven isolates from various food samples were correctly identified to the species level by using the MicroID database. In conclusion, MALDI-TOF MS is comparable with commercial biochemical identification.

Color Laser Printer Identification through Discrete Wavelet Transform and Gray Level Co-occurrence Matrix (이산 웨이블릿 변환과 명암도 동시발생 행렬을 이용한 컬러 레이저프린터 판별 알고리즘)

  • Baek, Ji-Yeoun;Lee, Heung-Su;Kong, Seung-Gyu;Choi, Jung-Ho;Yang, Yeon-Mo;Lee, Hae-Yeoun
    • The KIPS Transactions:PartB
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    • v.17B no.3
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    • pp.197-206
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    • 2010
  • High-quality and low-price digital printing devices are nowadays abused to print or forge official documents and bills. Identifying color laser printers will be a step for media forensics. This paper presents a new method to identify color laser printers with printed color images. Since different printer companies use different manufactural systems, printed documents from different printers have little difference in visual. Analyzing this artifact, we can identify the color laser printers. First, high-frequency components of images are extracted from original images with discrete wavelet transform. After calculating the gray-level co-occurrence matrix of the components, we extract some statistical features. Then, these features are applied to train and classify the support vector machine for identifying the color laser printer. In the experiment, total 2,597 images of 7 printers (HP, Canon, Xerox DCC400, Xerox DCC450, Xerox DCC5560, Xerox DCC6540, Konica), are tested to classify the color laser printer. The results prove that the presented identification method performs well with 96.9% accuracy.

New Paradigm in exhibition organization at the National Museum of Contemporary Art ('연구 업무 전담제'를 통해 살펴보는 국립현대미술관 전시 기획의 새로운 패러다임)

  • Choi, Eun-Ju
    • The Journal of Art Theory & Practice
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    • no.3
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    • pp.67-84
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    • 2005
  • Since the evaluation of its intellectual activities and abilities is done by curator's capabilities, planning exhibition is very important as the final result achieved by their own knowledge, information, and research. ARPA(Advanced Research Project on Arts) is suggested as the system which enables curators responding simultaneously to the society in the times, based on its special characteristics. If this system settles well, which means that the curators at NMCA(National Museum of Contemporary Art, Korea) play their roles as the professionals in each of their fields, the goal of consolidating the status of museum as the representative national museum, and building up competent department of curators, will be achieved at the same time. To clarify above, the curators set up the various assignments of research about the types of arts such as painting, Korean painting, sculpture, installation, new-media, design, craft, photogarphy, architecture, etc. And they establish the art objects classified by the regions, such as the Northern American, Southern American, European, Asian, and other Third World countries. They elaborate art objects more on the history, the work, the artist, and the issue of contemporary art. Furthermore, when the curators devote deeper study to those research subjects, they can have the opportunities to design an exhibition upon the research. Today, the museum of art is 'The Place for Communication and Encounter', it is regarded important to share the aesthetical, creative values with current artists, and to understand mutually with the spectators. It is needed to improve the curator's work, in order to meet the demands of the times and even to advance. Because the form of 'exhibition' is the tool that reveals the identity NMCA aiming at, the motivation, the development, and the realization should be leaded by the curators, who are the mainstream of the museum. ARPA is a system for identifying the exhibition like mentioned above. The main purpose of this system is to produce synergy effect, having the researching, collecting work in liaison with planning exhibition. ARPA will be able to improve the quality of exhibition through the way of developing the exhibition, passing through the stable process in the long run. So far, I have referred to a new paradigm of the exhibition design at NMCA via ARPA. Yet, there still remain missions in reality, such as analyzing the previous exhibition and reshuffling personnel and system, which should be done. When these matters settled, these plans would be suggested practically. At this point, it is the most significant that NMCA is attempting to let others aware of the importance of exhibition planning based on research. when the ARPA and exhibition planning is conjoined together successfully, the competent exhibition will be achieved, which can offer a meaningful exhibition to the art world, strengthen infra structure thru exchanging with public museum in the region, and eventually, establish a network with museum in foreign countries.

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Effect of Plant Growth Regulators on Direct Shoots Formation and Somatic Embryogenesis from Leaf Tissue Culture of Muscari armeniacum 'Early Giant' (무스카리(Muscari armeniacum 'Early Giant') 엽절편 조직으로부터 신초형성과 체세포 배발생에 미치는 생장조절물질의 영향)

  • Jeon, Su-Min;Chung, Mi-Young;Lee, Hyang-Bun;Han, Jeung-Sul;Park, Jae Suk;Kim, Chang-Kil;Chung, Jae-Dong
    • FLOWER RESEARCH JOURNAL
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    • v.18 no.4
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    • pp.261-265
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    • 2010
  • This experiment was carried out in order to determine proper plant growth regulators (PGR) and their concentrations for direct shoot induction and somatic embryogenesis from leaf tissue cultures of Muscari armeniacum 'Early Giant'. Direct shoot formation from the leaf explant culture was effective only on a half-strength MS medium containing $0.1mg{\cdot}L^{-1}$ 2,4-D, while embryogenesis was occurred on a half-strength MS medium containing $0.1{\sim}1.0mg{\cdot}L^{-1}$ IPA or without PGR. The regenerated bulblets derived from embryos or shoots were harvested and transplanted into a greenhouse. The sprouting percentage of bulblets obtained from different culture media ranged from 80 to 100% and growth of quality bulblets was enhanced when the bulblets were harvested from the medium containing $0.1mg{\cdot}L^{-1}$ NAA and $1.0{\sim}3.0mg{\cdot}L^{-1}$ IPA.

A Comparative Study on Institutional Influence Factors of Firm's Motivation of Participating and Investing in Apprenticeship in Germany and Korea (기업의 도제훈련 참여 및 투자 동기의 제도적 영향요인: 독일-한국 비교 연구)

  • LEE, Hanbyul
    • Korean Journal of Comparative Education
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    • v.27 no.1
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    • pp.247-284
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    • 2017
  • The purpose of this study is to analyze firm's motivation of participating and investing in apprenticeship in Germany and Korea, and to investigate institutional factors influencing firm's motivation. By comparing institutional factors of the two countries, it aims to drawing out policy implications for improving Korean apprenticeship. The main method for data collection was comprehensive literature review on international organizations, each countries' government and research institutes' policy materials, statistical data, research outputs and media resources related to each countries' apprenticeship. Considering whether firm's motivation for participating and investing in apprenticeship is production-oriented or investment-oriented, Germany is more inclined to investment motivation with firm's covering net cost during apprenticeship period. On the other hand, Korea is more inclined toward production orientation with firm's expectation of gaining net profit during the training period. Why is firm's training motivation different in these two countries? The author tried to find the reason from the difference of institutional factors of the countries by dividing institutional factors into 4 categories: context(tripartite relations, legal framework), input (flexibility of the system, government incentive), process(training contents, training duration, quality assurance), and output(completion/retention rate, apprentice's productivity). The key implication from the comparative analysis of institutional factors is that it is necessary to enforce companies to have "accountability" on the minimum critical elements, but also to ensure them to have "autonomy" on the rest of the elements.

Compression of CNN Using Low-Rank Approximation and CP Decomposition Methods (저계수 행렬 근사 및 CP 분해 기법을 이용한 CNN 압축)

  • Moon, HyeonCheol;Moon, Gihwa;Kim, Jae-Gon
    • Journal of Broadcast Engineering
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    • v.26 no.2
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    • pp.125-131
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    • 2021
  • In recent years, Convolutional Neural Networks (CNNs) have achieved outstanding performance in the fields of computer vision such as image classification, object detection, visual quality enhancement, etc. However, as huge amount of computation and memory are required in CNN models, there is a limitation in the application of CNN to low-power environments such as mobile or IoT devices. Therefore, the need for neural network compression to reduce the model size while keeping the task performance as much as possible has been emerging. In this paper, we propose a method to compress CNN models by combining matrix decomposition methods of LR (Low-Rank) approximation and CP (Canonical Polyadic) decomposition. Unlike conventional methods that apply one matrix decomposition method to CNN models, we selectively apply two decomposition methods depending on the layer types of CNN to enhance the compression performance. To evaluate the performance of the proposed method, we use the models for image classification such as VGG-16, RestNet50 and MobileNetV2 models. The experimental results show that the proposed method gives improved classification performance at the same range of 1.5 to 12.1 times compression ratio than the existing method that applies only the LR approximation.

A Study on the Agenda Setting Process of Teacher's Certification System in China (중국 교사자격제도의 의제설정 과정 분석)

  • Li, Yu-Yan;Jang, Seon-Hee;Chung, Jae-Young
    • Korean Journal of Comparative Education
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    • v.28 no.4
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    • pp.249-272
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    • 2018
  • The purpose of this study is to analyze which group led the process of agenda setting of teacher's certification system in China from 1978 to 2018 using the Cobb & Elder's theoretical model. The period of about 40 years from 1978 to 2018 is divided into the introduction period of teacher's certification period (1978~1992), transition period (1993~1998), and stabilization stage (1999~2018). The agenda setting process was analyzed. As a result, the group that led the process of agenda setting of the Chinese teacher's certification system varied according to the period. The introduction period of teacher's certification system was analyzed as 'Inside Access Model' led by policy makers and government, and the transition period was confirmed as 'Mobilization Model' led by Chinese government and Ministry of Education. The stabilization period was analyzed as 'Outside Initiative Model' led by various groups such as mass media, researchers, and government. It was found that the process of agenda setting of teacher's certification system had been changing toward democratization according to the degree of development of Chinese society, and the quality control of teacher certifications had been strengthened.

Breeding of a new cultivar of Flammulina velutipes: 'Baeke' (팽이 신품종 '백이' 육성)

  • Im, Ji-Hoon;Jang, Kab-Yeul;Oh, Youn-Lee;Oh, MinJi;Lee, Seul-ki;Raman, Jegadeesh;Kong, Won-Sik
    • Journal of Mushroom
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    • v.16 no.4
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    • pp.299-303
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    • 2018
  • Flammulina velutipes, which is a white rot fungus, is a commercially important edible mushroom and is produced in large quantities with the help of an automated and mechanized cultivation system in Korea. F. velutipes has the lowest distribution rate among domestic cultivars, estimated at about 20 percent. As most white cultivars of F. velutipes produced and exported to Korea were introduced from Japan, farmers pay large amounts of royalties. Therefore, we have developed a new, purely domestic cultivar, "Baeke," to substitute for Japanese cultivars, which has improved storage characteristics for export. Baeke was bred by mating two monokaryotic strains isolated from ASI 4216-18 (Hansol) and ASI 4217-26 (Baekjung). Baeke showed faster mycelial growth and higher mycelial density upon incubation for seven days at $25^{\circ}C$ on PDA media than the control variety. The mycelial growth of Baeke was even maintained at $30^{\circ}C$ unlike the control. The lengths of pilei and stipes in Baeke harvested in the optimal stage were $11.2{\pm}0.5mm$ and $125{\pm}5.4mm$, respectively, and they were $11{\pm}0.5mm$ and $141.9{\pm}5.7mm$, respectively, in the control harvested in the optimal stage. The yields of Baeke ($257.4{\pm}13.5g$) and control ($270.7{\pm}17.8g$) per 1,100ml in bottle cultivation showed no significant difference. Overall, our results showed that Baeke was at par with foreign varieties of Flammulina velutipes in terms of quality and yield and had a uniformly shaped fruitbody, which added to its commercial value.

Evaluation of the Discoloration of Pyropia yezoensis Ueda Using a Colorimeter (색차계를 이용한 방사무늬김(Pyropia yezoensis Ueda)의 황백화 평가)

  • Lee, Sang Yong;Kim, Young Hee;Lee, Jee Eun;Hwang, Eun Kyoung
    • Korean Journal of Environmental Biology
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    • v.36 no.4
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    • pp.620-625
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    • 2018
  • Pyropia yezoensis is one of the most extensively cultivated seaweeds used as food in Korea. However, the quality and yield of Pyropia farms are frequently affected by outbreaks of thallus discoloration. The objective of this study was to develop a simple and rapid method to evaluate P. yezoensis discoloration caused by nutrient deficiencies. A colorimeter was used to quantify the color of P. yezoensis in nutrient deficient media over 10 days. Quantitative values of lightness (L), redness (a), and yellowness (b) measured with a colorimeter were used as indicators of P. yezoensis discoloration. The vacuoles of P. yezoensis were observed at 4 days and swelled gradually from 6 days onward. The three colorimeter parameters L, a, and b values showed significantly different values with culture period. The lightness (L) value was darker initially, and continued to lighten over culture period. The yellowness (b) value increased, but the redness (a) value decreased throughout this study. The a/b ratio and redness (a) values from the colorimeter were important P. yezoensis color change indicators. The discoloration group of P. yezoensis had quantitative values for parameters of L above 70, a below 2.6, and b above 15.0. The results of this study showed that quantitative colorimetric measurements can be used as tools for simple and rapid detection of P. yezoensis discoloration.

The Effects of Utilitarian and Hedonic Perceptions of Travel Review Website on Perceived Usefulness and Behavioral Intention (여행 리뷰 웹사이트의 기능적, 쾌락적 인식이 지각된 유용성 및 행동의도에 미치는 영향)

  • Kim, Yong-Soon
    • The Journal of the Korea Contents Association
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    • v.19 no.9
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    • pp.152-161
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    • 2019
  • The purpose of this study was to research the relationships among utilitarian perceptions, hedonic perceptions, perceived usefulness and behavioral intention. Recently, consumers rely heavily on user-generated contents of social media channels to support their purchase decisions, such as electronic word-of-mouth. Electronic word-of-mouth helps consumers to evaluate items before making purchase, to reduce purchase risks and to support their purchase decisions. This study was based on both the analysis derived from a hypothesis and literature reviews and data collected from 255 travelers who had used travel review website at least once. The results of empirical analysis showed as follows. First, Utilitarian perceptions(information quality) has a significant impact on the perceived usefulness of a travel review website. Second, Enjoyment has a significant impact on the perceived usefulness of a travel review website. Third, Curiosity fulfilment has a significant impact on the perceived usefulness of a travel review website. Finally, Perceived usefulness of a travel review website has a significant impact on behavioral intention. Based on these findings, the implications and limitations of the study were presented including some directions for future studies.