Hee-Min Lee

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OBJECTIVE With the introduction of third-generation light-emitting diodes (LEDs) in dental practice, it is necessary to compare their bracket-bonding effects, safety, and efficacy with those of the second-generation units. METHODS In this study, 80 extracted human premolars were randomly divided into eight groups of 10 samples each. Metal or(More)
  • Frank Zhou, Douglas Skinner, Philip Berger, Richard Hahn, Haresh, Ray Ball +23 others
  • 2016
This paper examines the effects of investor learning on the dynamics of managers' voluntary disclosure decisions. Using a multi-period voluntary disclosure model and structural estimation, I find that investor learning introduces persistence in disclosure incentives because of the correlation of investors' beliefs over time. Disclosure is more likely when(More)
The accuracy and sensitivity of PCR-based methods for detection of hepatitis A virus (HAV) are dependent on the methods used to separate and concentrate the HAV from the infected cells. The pH and ionic strength affect the binding affinity of the virus to cells. In this study, we initially investigated the effects of pH (4.0-10.0) and metal ions (Fe²⁺,(More)
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