• 제목/요약/키워드: challenge

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TETRA 인증 프로토콜 분석 (The Analysis of the TETRA Authentication Protocol)

  • 박용석;안재환;정창호;안정철
    • 한국정보통신학회:학술대회논문집
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    • 한국해양정보통신학회 2006년도 춘계종합학술대회
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    • pp.187-190
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    • 2006
  • TETRA 시스템에서는 인가된 단말기만이 망에 접속하도록 하기 위해 단말기 인증 서비스를 제공한다. 단말기 인증이란 Challenge-response 프로토콜에 의해 단말기와 인증센터에 사전에 공유된 인증키가 일치하는지를 확인하는 과정이다. 본 논문에서는 TETRA 인증 시스템에서 인증키 생성/분배/주입 모델을 분석하고, 인증키의 노출로 인한 복제단말기의 위협을 분석한다.

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사용후연료 종합관리 DB시스템 개발 연구 (A Study on the Development of Nuclear Spent Fuel Database System)

  • 이용석;이병철
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2007년도 제38회 하계학술대회
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    • pp.1870-1871
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    • 2007
  • 본 연구에서는 국내 원자력발전소에서 발생하는 사용후연료의 저장, 이송, 연소 이력을 국가 차원에서 종합관리하기 위한 DB 시스템을 구축하기 위한 DB 기본설계 작업을 수행하였다. DB 기본설계를 위하여 사용후연료 관련 해외 DB 현황조사 및 저장이력 관련 pilot DB 시스템 설계 작업을 수행하였다. 향후 사용후연료 저장이력 뿐 아니라 이송, 설계/제작, 연소이력 등을 포함한 자료수집 및 가공, DB 시스템 및 입력화면 설계 작업을 수행하여 인터넷으로 사용후연료 관리상태를 확인할 수 있는 종합 DB 시스템을 구축할 예정이다.

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Inhibition of Fusarium oxysporum f. sp. nicotianae Growth by Phenylpropanoid Pathway Intermediates

  • Shull, Timothy E.;Kurepa, Jasmina;Miller, Robert D.;Martinez-Ochoa, Natalia;Smalle, Jan A.
    • The Plant Pathology Journal
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    • 제36권6호
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    • pp.637-642
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    • 2020
  • Fusarium wilt in tobacco caused by the fungus Fusarium oxysporum f. sp. nicotianae is a disease-management challenge worldwide, as there are few effective and environmentally benign chemical agents for its control. This challenge results in substantial losses in both the quality and yield of tobacco products. Based on an in vitro analysis of the effects of different phenylpropanoid intermediates, we found that the early intermediates trans-cinnamic acid and para-coumaric acid effectively inhibit the mycelial growth of F. oxysporum f. sp. nicotianae strain FW316F, whereas the downstream intermediates quercetin and caffeic acid exhibit no fungicidal properties. Therefore, our in vitro screen suggests that trans-cinnamic acid and para-coumaric acid are promising chemical agents and natural lead compounds for the suppression of F. oxysporum f. sp. nicotianae growth.

Recent Advances in Structural Health Monitoring

  • Feng, Maria Q.
    • 비파괴검사학회지
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    • 제27권6호
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    • pp.483-500
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    • 2007
  • Emerging sensor-based structural health monitoring (SHM) technology can play an important role in inspecting and securing the safety of aging civil infrastructure, a worldwide problem. However, implementation of SHM in civil infrastructure faces a significant challenge due to the lack of suitable sensors and reliable methods for interpreting sensor data. This paper reviews recent efforts and advances made in addressing this challenge, with example sensor hardware and software developed in the author's research center. It is proposed to integrate real-time continuous monitoring using on structure sensors for global structural integrity evaluation with targeted NDE inspection for local damage assessment.

Survey Methodology for Estimating Patronage of High-Speed Rail in Korea

  • Lee, Jin-Sun;Nam, Doo-Hee
    • International Journal of Railway
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    • 제4권2호
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    • pp.29-33
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    • 2011
  • High-speed rail study needs to focus on passenger movements as a key element of the planning process. A particular challenge is obtaining comprehensive information on high-speed rail passenger movements. A national preference stated survey was conducted from October to November of 2011 to meet this challenge through direct personal interviews of travelers between Seoul and Busan (the so called Kyung-Bu corridor). Over 40 interviewers were hired and trained to conduct personal interviews at several stations along locations within Kyung-Bu Seoul and Busan corridor. A total of 4,550 travelers were interviewed, furnishing an extensive database on high-speed rail passenger movements. The methodology and procedure employed to collect the national data for Korean high-speed train KTX are described. Specific issues investigated include survey design, questionnaire and strategy. Lessons learned from the high-speed rail passenger movement study provide insights for other countries contemplating similar high-speed rail studies.

Review of Energy Saving Technology of Hybrid Construction Machine

  • Yu, YingXiao;Jeong, Eunjin;Ahn, Kyoung Kwan
    • 드라이브 ㆍ 컨트롤
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    • 제15권4호
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    • pp.91-100
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    • 2018
  • This study focuses on the energy saving of construction machinery, especially excavators and wheel loaders coming on a backdrop of energy shortage and environment pollution. Due to the problem of the low energy efficiency and the pollution of conventional hydraulic excavators, hybrid hydraulic excavators were developed to solve this challenge. Firstly, this paper discusses the different configurations of the hybrid hydraulic excavator and recent research trend of hybrid hydraulic excavator is reviewed. Secondly, the productions and research of the construction machine companies were analyzed and finally, the future challenges of hybrid technology to the hydraulic excavator were discussed.

Pattern mining for large distributed dataset: A parallel approach (PMLDD)

  • Pal, Amrit;Kumar, Manish
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제12권11호
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    • pp.5287-5303
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    • 2018
  • Handling vast amount of data found in large transactional datasets is an obvious challenge for the conventional data mining algorithms. Addressing this challenge, our paper proposes a parallel approach for proper decomposition of mining problem into sub-problems in order to find frequent patterns from these datasets. The proposed, Pattern Mining for Large Distributed Dataset (PMLDD) approach, ensures minimum dependencies as well as minimum communications among sub-problems. It establishes a linear aggregation of the intermediate results so that it can be adapted to large-scale programming models like MapReduce. In this context, an algorithmic structure for MapReduce programming model is presented. PMLDD guarantees an efficient load balancing among the sub-problems by a specific selection criterion. Further, it optimizes the number of required iterations over the dataset for mining frequent patterns as compared to the existing approaches. Finally, we believe that our approach is scalable enough to handle larger datasets in terms of performance evaluation, and the result analysis justifies all these mentioned concerns.

도전적 스트레스와 성과간의 비선형적 관계에 대한 연구 (A Study on the Curvilinear Relationship Between Challenge Stress and Performance)

  • 한수진;박오원
    • Journal of Information Technology Applications and Management
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    • 제27권6호
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    • pp.15-29
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    • 2020
  • Previous studies on the relationship between stress and performance have shown inconsistent results. Thus, this study focused on the effect of challenging stress among the two types of stress types and investigated the nonlinear relationship between the challenging stress and the performance. In particular, performance was divided into job performance, which is related to in-role behavior, and organizational citizenship behavior, which is characterized as extra-role behavior. Empirical results using 222 samples of Chinese workers have showed that challenging stress had a nonlinear relationship with job performance and organizational citizenship behavior. However, it was found that the shape of nonlinear relationship of the challenging stress on job performance and organizational citizenship behavior was slightly different. Finally, the theoretical and practical implications of this paper and future research directions are discussed.

Inhibitory Action of Phenylpropanoids on Arthus Reaction, Plaque Forming Cells and Hemagglutinin titer

  • Lee, Ji-Yun;Kim, Youn-Joung;Lee, Jin-Hee;Kim, Tae-Doo;Sim, Sang-Soo;Kim, Chang-Jong
    • 대한약학회:학술대회논문집
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    • 대한약학회 2003년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.1
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    • pp.195.1-195.1
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    • 2003
  • Many kinds of phenylpropanoids(PP), C6-C3 compounds, are widely distributed in many plants. In this experiments, effect of PP on sheep red bood cells (sRBC)-induced Arthus reaction (AR) were studied in ICR male mice. SRBC were challenged by i.p. injection two weeks after sensitization of Lp. injection of sRBC. Five days after the challenge of antigen, paw edema induced 3 hours after the last challenge by AR. (omitted)

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Effects of Compound-A on Delayed Type Hypersensitivity and Formation of Rosette Forming Cells

  • Kim, Youn-Joung;Lee, Ji-Yun;Kim, Kyung-Won;Sim, Sang-Soo;Kim, Chang-Jong
    • 대한약학회:학술대회논문집
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    • 대한약학회 2003년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2-2
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    • pp.126.1-126.1
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    • 2003
  • Compound-A is a phenylpropanoid isolated from Arctium lappa fruit. In this experiments, effect of Compound-A on sheep red bood cells (sRBC) - induced delayed type hypersensitivity (DTH) were studied in ICR male mice and determined the Rosette Forming Cells (RFC). Two weeks after sensitization of i.p. injection of sRBC (4$\times{10}^8$ cells), ICR male mice were challenged by i.p. injection of sRBC (2\times{10}^8$ cells). Five days the challenge of antigen, paw edema induced twenty-four hours after the last challenge by DTH. (omitted)

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