Title page for etd-0717112-153339


[Back to Results | New Search]

URN etd-0717112-153339
Author Shih-hsiung Lwo
Author's Email Address No Public.
Statistics This thesis had been viewed 5354 times. Download 1186 times.
Department Business Management
Year 2011
Semester 2
Degree Ph.D.
Type of Document
Language English
Title A study of risk index and measurement uncertainty for food surveillance – A case of melamine incident
Date of Defense 2012-07-04
Page Count 90
Keyword
  • limit of detection
  • melamine
  • risk assessment
  • food safety
  • risk matrix
  • Turnbull estimator
  • Abstract The melamine incident 2008 was a global food crisis and drew attentions to other potential food safety risks. Although there are regulations and standards for food safety, but one common problem in food risk management is that it lacks on hazard indicators - indicators in ranking of food risk and control.
    The three algorithms developed in this article were:
    1. A distribution fitting algorithm proposed to estimate population parameters for left-censored melamine data under log-normal assumption.
    2. A risk index algorithm proposed to screen out food product categories with higher concentration without considering measurement uncertainty.
    3. A misjudgment probability algorithm proposed to calculate the probability that food categories containing melamine more than legal limit but classified satisfactory under consideration of measurement uncertainty.
    The test results on melamine collected from the website of the Centre for Food Safety of Hong Kong are empirically analyzed by the proposed algorithms. The risk index (RI) and the consumer’s risk (CR) of multiple food categories are discussed and compared in details. Based on risk index (RI) and consumer’s risk (CR), we build a risk assessment process to help assess melamine risk and make sample strategy in surveillance programme. The proposed risk assessment process can be applied to other chemical contaminant problems such as plasticizer (phthalate esters) and ractopamine (paylean), etc.
    Advisory Committee
  • Iuan-yuan Lu - chair
  • Tong-yuan Koo - co-chair
  • Pao-tiao chuang - co-chair
  • Tsuang Kuo - co-chair
  • Hsien-tang Tsai - advisor
  • Files
  • etd-0717112-153339.pdf
  • indicate access worldwide
    Date of Submission 2012-07-17

    [Back to Results | New Search]


    Browse | Search All Available ETDs

    If you have more questions or technical problems, please contact eThesys