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Youngmo Kim,Sang Hun Han,Yong Beom Shin,Jin A Yoon,Sang Hun Kim 영남대학교 의과대학 2023 Yeungnam University Journal of Medicine Vol.40 No.1
Psychogenic dysphagia is a deglutition disorder characterized by a fear of swallowing, with no structural or functional causes. This report presents the case of a young male patient who had severe malnutrition due to psychogenic dysphagia and was provided visual biofeedback using fiberoptic endoscopic evaluation of swallowing (FEES). A healthy 25-year-old man presented to our clinic with a complaint of throat discomfort when swallowing that had started 6 months prior. As the symptoms worsened, he became fearful of food spreading to his lungs after swallowing and the development of respiratory difficulties. His food intake gradually decreased, resulting in a weight loss of 20 kg within 2 months. Evaluation of organic and other functional causes of dysphagia was performed, but no abnormalities were detected. The sensation of a lump in his throat, fear of swallowing, and anxiety were transformed into somatic symptoms. The patient was diagnosed with psychogenic dysphagia. After visual biofeedback by a physician who performed FEES, the patient resumed eating normally and increased his food intake. If routine tests do not reveal structural or functional causes of dysphagia, assessment of a psychogenic swallowing disorder should be considered. FEES can help in the diagnosis and management of psychogenic dysphagia.
Yoon, Hong Min,Jung, Youngmo,Jun, Seong Chan,Kondaraju, Sasidhar,Lee, Joon Sang The Royal Society of Chemistry 2015 Nanoscale Vol.7 No.14
<P>A sliding object on a crystal surface with a nanoscale contact will always experience stick-slip movement. However, investigation of the slip motion itself is rarely performed due to the short slip duration. In this study, we performed molecular dynamics simulation and frictional force microscopy experiments for the precise observation of slip motion between a graphene layer and a crystalline silicon tip. The simulation results revealed a hierarchical structure of stick and slip motion. Nanoscale stick and slip motion is composed of sub-nanoscale stick and slip motion. Sub-nanoscale stick and slip motion occurred on a timescale of a few ps and a force scale of 10<SUP>−1</SUP>nN. The relationship between the trajectories of the silicon tip and stick-slip peak revealed that in-plane and vertical motions of the tip provide information about stick and slip motion in the sub-nanoscale and nanoscale ranges, respectively. Parametric studies including tip size, scan angle, layer thickness, and flexibility of the substrate were also carried out to compare the simulation results with findings on lateral force microscopy.</P>
공정기반 산업의 프로세스 인프라 역량 평가 방법 제안 및 적용
강영모(Youngmo Kang),임병혁(Byeonghyeok Im),윤병운(Byungun Yoon),이성주(Sungjoo Lee) 한국산업경영시스템학회 2012 한국산업경영시스템학회지 Vol.35 No.1
Recently, as organizational systems have become larger and more complicated, the evaluation for their efficiency and effectiveness has become more difficult but important. It is essential to understand the current strength and weakness of the organizational process. It can be a starting point for improving the efficiency and effectiveness of the organizational systems, because the quality of system outputs depend greatly on the capability of system process. Particularly in such process-based industries as semiconductor, energy or software industries, an assessment of process capability is more highlighted to gain knowledge of the expected quality and reliability of system outputs. As a result, much attention has been given to the issues of process capability assessment in the process-based industries. However, most of the previous research in those industries is based on case studies, a more generalized method for process capability assessment is in need for help more companies improve their processes. Therefore, this study aims to propose a process capability assessment method and apply the proposed method to an energy company. This research argues that the process capability is composed of individual and organizational capabilities of the process. Then, the concept of Capability Maturity Model Integration, which was initially suggested to evaluate the software development process, was introduced to develop the assessment tools and process. Finally, the proposed method was applied to a Korean company in the energy industry sector to verify its utility. The research outputs are expected to help more firms assess their process capability and ultimately improve the process.
Sung-Ho Yoon,Min Jong Kil,Jun-Hyeok Jeon,Hyun-Mi Kim,Seul-Gi Kim,Jiye Han,Eui-Sung Lee,Youngmo An,Jin Woo Cho,Jihwan An,Jae-Boong Choi,Il Jeon,Hyeongkeun Kim 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.10 No.5
A novel rotary-type atomic layer deposition (ALD) process for coating platinum thin film on three-dimensional (3D) substrates is demonstrated. High uniformity and conformability of the platinum thin-film deposition on 3D substrates were confirmed, ensuring the controllability of the new ALD technique. The results for this technique surpassed those of the conventional wet method and ordinary atomic layer deposition, which both have a limited specific surface area. To demonstrate the application of this new technology, Pt nano-film coated γ-Al2O3 was produced using the rotary-type ALD and applied to diesel oxidation catalysts (DOCs). The produced DOCs showed high Pt content when the number of ALD cycles was increased, and thereby exhibited more complete combustion of gaseous pollutants, such as CO, C3H8, and NO, even at lower temperatures. Pt nano-film deposition by the rotary-type ALD process was first optimised on Si wafer substrates. The process was controlled by four parameters: processing temperature, number of ALD cycles, precursor pulse time, and reactant pulse time. Deposition of the Pt nano-film was mainly determined by the processing temperature and the number of ALD cycles. The average growth per cycle and density of the Pt nano-film were found to be 0.8 Å/cycle and 21.0 g/cm3, respectively. The same procedure and conditions were applied to 3D γ-Al2O3 powder substrates for DOCs, which demonstrated greater conversion performance compared with conventional Pt-used DOCs.
Glucose Detection with Radio Frequency Biosensor
박형구(Hyung Goo Park),정영모(Youngmo Jung),윤형서(Hyongseo Yoon),오주영(Juyoung Oh),임주환(Juhwan Lim) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
A glucose detecting biosensor, based on the S parameter in RF, is presented in this article. Glucose is possible to finely detect with PBA on the surface of the nano-scaled graphene. This PBA provides the excellent sensitivity and accuracy, covalently bonded to two or three hydroxides of glucose.