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( Hyuk Sang Jung ),( Dong Kyun Park ),( Min Ju Kim ),( Sang Kyun Yu ),( Kwang An Kwon ),( Yang Suh Ku ),( Yu Kyung Kim ),( Ju Hyun Kim ) 대한내과학회 2009 The Korean Journal of Internal Medicine Vol.24 No.1
Background/Aims: Colorectal cancer, one of the most common cancers in developed countries, is curable when diagnosed at an early stage. However, for better screening, both a test that patients will tolerate and diagnostic accuracy are required. We compared patient experiences and preferences between computed tomographic (CT) colonography and conventional colonoscopy (CC) under conscious sedation. Methods: Patients referred to the gastrointestinal clinic for CC were enrolled to also undergo CT colonography prior to CC. After each procedure, patients completed a questionnaire in which variables, such as abdominal pain, abdominal discomfort, and loss of dignity, were assessed using a 7-point Likert scale, with the highest score representing the worst experience. To verify response stability, a telephone questionnaire followed within 24 h after each procedure. Patients were then asked about their preference for CT colonography or CC. Results: Data were collected from 51 patients who fulfilled all requirements, including CT colonography, CC, the two questionnaires after each procedure, and a follow-up questionnaire. Severity of abdominal pain, abdominal discomfort, and a loss of dignity were reported to be higher in CT colonography than in CC (p<0.01). In addition, the preference for CC was significantly higher than that for CT colonography (p<0.01). Conclusions: Although CT colonography is a safe and noninvasive screening test for colorectal cancer, further study is required to increase patient acceptance. (Korean J Intern Med 2009;24:43-47)
Winding Factor of Vernier Permanent Magnet Motor
Kwon Hyuk-Sung,Yeo Han-Kyeol,Seo Jangho 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.4
Several studies have been reported on vernier permanent magnet synchronous motors (VPMSMs) using spatial harmonics in air-gap fl ux density owing to their low-speed high-torque characteristics. However, coeffi cients that can predict the performance of VPMSMs in motor design processes have not been extensively researched. The gear ratio indicates the degree of amplifi cation of the spatial harmonics, but there is a big diff erence between the performances predicted using the gear ratio and the actual performance of VPMSMs. The winding factor can estimate the magnitude of the electromotive force (EMF) of the motor. Although the winding factor is suitable for conventional motors, it cannot be applied to VPMSM, which amplifi es EMF through spatial harmonics. In this study, we investigated the winding factor of VPMSMs and proposed a winding factor calculation method suitable for VPMSMs. Based on the analytical method, the proposed calculation method could instantly and accurately estimate the winding factor of VPMSMs. With this method, the EMF performance of VPMSMs can be predicted according to the pole–slot combination. To verify the validity of the proposed method, we compared the gear ratio, the proposed winding factor, and the magnitude of the EMF obtained by the fi nite element method.
Kwon, Ra Hee,Lee, Sang Hyuk,Yoon, Young Jun,Seo, Jae Hwa,Jang, Young In,Cho, Min Su,Kim, Bo Gyeong,Lee, Jung-Hee,Kang, In Man The Institute of Electronics and Information Engin 2017 Journal of semiconductor technology and science Vol.17 No.2
We have proposed an InGaAs-based gate-all-around (GAA) tunneling field-effect transistor (TFET) with a stacked dual-metal gate (DMG). The electrical performances of the proposed TFET are evaluated through technology computer-aided design (TCAD) simulations. The simulation results show that the proposed TFET demonstrates improved DC performances including high on-state current ($I_{on}$) and steep subthreshold swing (S), in comparison with a single-metal gate (SMG) TFET with higher gate metal workfunction, as it has a thinner source-channel tunneling barrier width by low workfunction of source-side channel gate. The effects of the gate workfunction on $I_{on}$, the off-state current ($I_{off}$), and S in the DMG-TFETs are examined. The DMG-TFETs with PNPN structure demonstrate outstanding DC performances and RF characteristics with a higher n-type doping concentration in the $In_{0.8}Ga_{0.2}As$ source-side channel region.
Kwon, Su Yong,Kim, Yong-Gyoo,Lee, Sang Hyun,Moon, Jun Hyuk Springer-Verlag 2011 METROLOGIA -BERLIN- Vol.48 No.5
<P>One of the standard methods used to measure the size of nanoparticles in aqueous solutions <I>in situ</I> is dynamic light scattering (DLS). The principle of this technique used to measure the real size of nanoparticles in a solution is the use of a procedure that extrapolates the apparent diffusion coefficients at different scattering angles and the sample concentration to infinite conditions. The uncertainty in the measurement is related to the extrapolating procedure used, and we have evaluated this for nanoparticles with diameters in the range 20 nm to 100 nm using the methods described in the ISO <I>Guide to the Expression of Uncertainty in Measurement</I>. The size of nanoparticles measured using DLS was compared with that obtained using a microscopic method, a cryo-transmission electron microscope, to check the reliability of the results obtained from the DLS measurements, which showed good agreement within the uncertainty levels evaluated.</P>