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Pil-Kyo Jung,Gung-Chol Lee,Cheol-Hyun Moon 대한치과교정학회 2015 대한치과교정학회지 Vol.45 No.6
Objective: This study investigated whether it is possible to use a twodimensional (2D) standard in three-dimensional (3D) analysis, by comparing the angles and lengths measured from a midsagittal projection in 3D cone-beam computed tomography (CBCT) with those measured by 2D lateral cephalometric radiography (LCR). Methods: Fifty patients who underwent both LCR and CBCT were selected as subjects. CBCT was reoriented in 3 different methods and the measuring-points were projected onto the midsagittal plane. Twelve angle values and 8 length values were measured on both LCR and CBCT and compared. Results: Repeated measures analysis of the variance revealed statistically significant differences in 7 angular and 5 linear measurements among LCR and 3 types of CBCT (p < 0.05). Of these 12 measurements, multiple comparisons showed that 6 measurements (ANB, AB to FH, IMPA, FMA, Co-Gn, Go-Me) were not significantly different in pairwise comparisons. LCR was significantly different from 3 types of CBCT in 3 angular (SN to FH, interincisal angle, FMIA) and 2 linear (S-Go, Co-ANS) measurements. The CBCT method was similar for all measurements, except for 1 linear measurement, i.e., S-N. However, the disparity between the mean values for all parameters was within the range of clinical measurement error. Conclusions: 3D-CBCT analysis, using midsagittal projection, is a useful method in which the 2D-LCR normative values can be used. Although the measurements changed with reorientation, these changes were not clinically significant.
Lim, Jung Pil,Rho, Jong Seok,Yi, Kyung Pyo,Seo, Jung Moo,Jung, Hyun Kyo Institute of Physics Publishing 2009 Smart materials & structures Vol.18 No.11
<P>A characteristic analysis of an ultrasonic motor (USM) at the design stage has thus far been impossible. Therefore, a characteristic analysis method is suggested on the basis of a proposed model describing the complex nonlinear contact condition between the rotor and stator. The proposed contact model and analysis method can guide theoretical research on the minimization of the main disadvantages of the USM, which mainly result from the contact mechanism. The validity and usefulness of the suggested analysis method is verified by experimental data from a prototyped USM. </P>
김필교(Pil-Kyo Kim),박준형(Junehyung Park),하민수(Min Soo Ha),정슬(Seul Jung) 제어로봇시스템학회 2013 제어·로봇·시스템학회 논문지 Vol.19 No.6
This paper presents the development and balancing control of GYROBO, a one wheeled mobile robot system. GYROBO is a disc type one wheel mobile robot that has three actuators, a drive motor, a spin motor, and a tilt motor. The dynamics and kinematics of GYROBO are analyzed, and simulation studies conducted. A one-wheeled robot, GYROBO is built and its balancing control is performed. Experimental studies of GYROBO"s balancing abilities are conducted to demonstrate the gyroscopic effects generated by the spin and tilt angles of a flywheel.
윤동환,Pil Kyo Jung,김희상,유승돈,김동환,Jinn Man Chon,Seong He Choi,Dae Gyu Hwang 대한재활의학회 2012 Annals of Rehabilitation Medicine Vol.36 No.1
Objective To investigate the effi cacy of ultrasonography (US)-guided injections in patients with low lumbar facet syndrome, compared with that in patients who received fl uoroscopy (FS)-guided injections. Method Fifty-seven subjects with facet syndrome of the lumbar spine of the L4-5 and L5-S1 levels were randomly divided into two groups to receive intraarticular injections into the facet joint. One group received FS-guided facet joint injections and the other group received US-guided facet joint injections. Treatment eff ectiveness was assessed using a visual analogue scale (VAS), physician’s and patient’s global assessment (PhyGA, PaGA), and the modifi ed Oswestry Disability Index (MODI). All parameters were evaluated four times: before injections, and at a week, a month, and three months after injections. We also measured, in both groups, how long it took to complete the whole procedure. Results Each group showed signifi cant improvement from the facet joint injections on the VAS, PhyGA, PaGA,and MODI (p<0.05). However at a week, a month, and three months after injections, no signifi cant diff erences were observed between the groups with regard to VAS, PhyGA, PaGA, and MODI (p>0.05). Statistically signifi cant diff erences in procedure time were observed between groups (FS: 248.7±6.5 sec; US: 263.4±5.9 sec; p=0.023). Conclusion US-guided injections in patients with lumbar facet syndrome are as eff ective as FS-guided injections for pain relief and improving activities of daily living.