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Yu Seungwan,Lee Wonhee,Kim Suhyun,Park Seyeon,Lee Eunhye,Huh Jinseok,Kim Hongik,Jung Sehun,Chu Hongmin 대한침도의학회 2023 대한침도의학회지 Vol.7 No.2
Background: The aim of this study is to provide the anatomical information and physi- ological effect of LR3 with its needling depth and retention time. Methods: We investigated the information of LR3 from literature and related research. Then we searched the clinical effect and needling depth, angle, retention time of LR3 from on-line databases like ‘DBPIA’, ‘KISS’, ‘OASIS’, ‘RISS’, PUBMED’ and ‘Google Scholar’ (2005-2023). Results: The needling depth of LR3 is 7-13 mm in the classic test, that of contemporary re- search is 10-20 mm. When stimulating LR3, the relative anatomical structures are dorsalis pedis artery and medial terminal branch of deep peroneal nerve. Conclusion: The effect of LR3 is originated from stimulation of deep peroneal nerve near- by dorsalis pedis artery. It activates the parasympathetic nerve through the induction of somatic autonomous reflex which leads to the effect of blood vessel expansion, intestinal movement activation, and blood sugar drop.
고온에서 전기적인 Wafer 특성 검사 시 Probe Mark 변화 연구
김승완(Seungwan KIM),손기복(Kibok SON),김경호(Kyungho KIM),유영훈(Younghoon Yu) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Semiconductor cost is decreased and the number of pin increase rapidly by the need of customer. The failure of probe mark change is increasing in the automatic test equipment because the pad size in the wafer chip is decreasing rapidly by chip shrink. So we have found out about the wafer expansion characteristics and changed algorithm to minimize probe mark change when we test wafer in hot temperature condition. And we analyzed the probe mark’s variation according to probe card array type and arrived at most suitable application array type. We developed 2’nd reticle about precision of recursion modulus and Stage Unit of Prober equipment heat transformation as condition of actual probing and finished it which it applied to scene after mass-production evaluation. This paper will help to increase quality of the domestic wafer test industry and the production volume.
Choi, Yu-Na,Lee, Seungwan,Kim, Hee-Joung Institute of Physics in association with the Ameri 2016 Physics in medicine & biology Vol.61 No.2
<P>K-edge imaging with photon counting x-ray detectors (PCXDs) can improve image quality compared with conventional energy integrating detectors. However, low-energy x-ray photons below the K-edge absorption energy of a target material do not contribute to image formation in the K-edge imaging and are likely to be completely absorbed by an object. In this study, we applied x-ray filters to the K-edge imaging with a PCXD based on cadmium zinc telluride for reducing radiation dose induced by low-energy x-ray photons. We used aluminum (Al) filters with different thicknesses as the low-energy x-ray filters and implemented the iodine K-edge imaging with an energy bin of 34–48 keV at the tube voltages of 50, 70 and 90 kVp. The effects of the low-energy x-ray filters on the K-edge imaging were investigated with respect to signal-difference-to-noise ratio (SDNR), entrance surface air kerma (ESAK) and figure of merit (FOM). The highest value of SDNR was observed in the K-edge imaging with a 2 mm Al filter, and the SDNR decreased as a function of the filter thicknesses. Compared to the K-edge imaging with a 2 mm Al filter, the ESAK was reduced by 66%, 48% and 39% in the K-edge imaging with a 12 mm Al filter for 50 kVp, 70 kVp and 90 kVp, respectively. The FOM values, which took into account the ESAK and SDNR, were maximized for 8, 6 to 8 and 4 mm Al filters at 50 kVp, 70 kVp and 90 kVp, respectively. We concluded that the use of an optimal low-energy filter thickness, which was determined by maximizing the FOM, could significantly reduce radiation dose while maintaining image quality in the K-edge imaging with the PCXD.</P>
Choi, Sunghoon,Lee, Seungwan,Choi, Yu-Na,Kim, Hee-Joung Korean Physical Society 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.12
Contrast media, such as iodine and gadolinium, are generally used in digital subtraction mammography to enhance the contrast between target and background materials. In digital subtraction mammography, where one image (with contrast medium) is subtracted from another (anatomical background) to facilitate visualization of the tumor structure, tumors can be more easily distinguished after the injection of a contrast medium. In order to have more an effective method to increase the contrast-to-noise ratio (CNR), we applied a projection-based energy-weighting method. The purpose of this study is to demonstrate the feasibility of using the projection-based energy-weighting method in digital subtraction mammography. Unlike some other previous studies, we applied the projection-based energy-weighting method to more practical mammography conditions by using the Monte Carlo method to simulate four different iodine solutions embedded in a breast phantom comprised of 50% adipose and 50% glandular tissues. We also considered an optimal tube voltage and anode/filter combination in digital iodine contrast media mammography in order to maximize the figure-of-merit (FOM). The simulated source energy was from 20 to 45 keV to prevent electronic noise and include the k-edge energy of iodine (33.2 keV). The results showed that the projection-based energy-weighting improved the CNR by factors of 1.05-1.86 compared to the conventionally integrated images. Consequently, the CNR of digital subtraction mammography images can be improved by using projection-based energy-weighting with photon-counting detectors.