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배정현(Jeong-Hyun Bae),윤경택(Kyung-Taek Yoon),임현호(Hyun-Ho Lim),최영만(Young-Man Choi) Korean Society for Precision Engineering 2021 한국정밀공학회지 Vol.38 No.8
The electromagnetic force compensation (EMFC) measurement principle has been widely adopted in the high-precision mass metrology system due to its sensitive compliant mechanism and nanometer level position sensor. In EMFC, an electromagnetic actuator balances the gravitational weight to maintain zero (or Null) position by feedback control using a position sensor, and the weight is calculated from the current applied to the actuator. Thus, a position sensor in the EMFC system should measure the null position accurately with high sensitivity and resolution. The position sensor commonly used in EMFC balance is an optical sensor that measures the displacement of EMFC balance from the intensity of light coming through a slit using a two-segment photodiode. This paper analyzed the characteristics of an optical position sensor for EMFC balance through parametric analysis using the Fresnel diffraction model. We also evaluated the performance of the sensor and confirmed the feasibility from weighing performance of the balance prototype. Normalized sensitivity of the sensor was 0.04237 μm<SUP>-1</SUP> and measured resolution was 1.09 nm. The weighing repeatability with our optical position sensor was 4.83 mg (1σ) at 10 g measurement, which was 3 times better than the repeatability with an alternative commercial sensor.
박경남,이민호,최호순,이동후,손주현,기춘석,함준수,전용철,이웅수,손영우,윤병철,윤경택 대한소화기학회 2000 대한소화기학회지 Vol.35 No.4
Eosinophilic gastroenteritis is a rare disease of unknown cause and presents with tissue eosinophilia, which can involve different layers of gut wall and show different gastrointestinal symptoms according to the invaded lesion or layer without parasitic infestation. A pathologic and clinical classification of eosinophilic gastroenteritis is based on the predominent layer of the gut wall involved. Serosal involvement is observed in the rarest form that is associated with eosinophilic ascites and dramatic steroid response. A 15-year-old woman with lower abdominal pain visited our hospital. She had a peripheral blood eosinophilia and moderate amount of ascites that is mainly composed of eosinophils. Small bowel series showed diffuse mucosal thickening from the duodenum to the ileum. We diagnosed the case as eosinophilic enteritis with ascites on the basis of clinical, laboratory, radiologic findings. She was treated with corticosteroid and responded rapidly with a complete resolution of ascites and the abdominal pain.