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- 저자 : Joon-Yub Kim (검색결과 99 건)
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The Effect of Distal Location of the Volar Short Arm Splint on the Metacarpophalangeal Joint Motion
Joon Yub Kim,Dong Wook Sohn,Ho Youn Park,Jeong Hyun Yoo,Joo Hak Kim,Myung Gon Jung,Jae Ho Cho 대한정형외과학회 2016 Clinics in Orthopedic Surgery Vol.8 No.2
Background: The goals of this study were to compare maximal metacarpophalangeal joint (MCPJ) flexion angles after application of a volar short arm splint at 3 different locations and verify the relations between the three different physical and radiological locations. Methods: Forty dominant hands of healthy subjects were analyzed in the study. We defined a transverse skin folding line as a line drawn from the radial aspect of the thenar crease to the ulnar aspect of the distal transverse palmar crease. The distal end of the volar short arm splint was applied on 3 parallel locations to this line. Location A was on this transverse skin folding line; location B was 1 cm proximal to location A; and location C was 1 cm distal to location A. Two orthopedic surgeons measured the maximal MCPJ flexion angles of each finger except the thumb with the application of a volar short arm splint at 3 different locations as well as without a splint as a control. Radiological locations of the 3 different distal ends of the volar short arm splint were also assessed by anteroposterior radiographs of the wrist. Results: When the splint was applied at location A and C, the maximal MCPJ flexion angle decreased to a mean of 83° (91% of control value) and 56° (62% of control value), respectively (compared to the control, p < 0.001). At location B, the maximal MCPJ flexion angle was a mean of 90° (99% of control value); no significant difference was observed compared to the control or without the splint (p = 0.103). On radiography, the average length from the metacarpal head to the distal end of the splint at all fingers decreased in the order of location B, A, and C (29 mm, 19 mm, and 10 mm, respectively; p < 0.001). Conclusions: We recommend applying the distal end of a volar short arm splint at proximal 1 cm to the transverse skin folding line to preserve MCPJ motion perfectly, which is located at distal 44% of the whole metacarpal bone length radiologically.
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Joon Yub Kim,Jung Soo Choe,Seok Won Chung 대한견주관절의학회 2016 대한견주관절학회지 Vol.19 No.1
Background: The purpose of this study is to compare the radiological and clinical outcomes after open reduction and plate fixation of midshaft clavicle fractures between patients who achieved successful anatomical reduction and those who had a remaining fracture gap even after open reduction and plate fixation, and were thus treated with additional demineralized bone matrix (DBM). Methods: This retrospective analysis was conducted on 56 consecutive patients who underwent open reduction and internal fixation using a locking compression plate for acute displaced midshaft clavicle fractures, and who underwent radiographic and clinical outcome evaluations at least 6 months postoperatively. The outcomes between those who achieved perfect anatomical reduction without remnant gap (n=32) and those who had a remaining fracture gap even after open reduction and plate fixation treated with additional DBM (n=24) were evaluated. Results: There were no differences in the use of lag screws or wiring and operation time (all p>0.05) between those with and without remnant gap. No difference in the average radiological union time and clinical outcomes (satisfaction and Constant score) was observed between the two groups (all p>0.05). However, significantly faster union time was observed for AO type A fracture compared with other types (p=0.012), and traffic accident showed association with worse clinical outcomes compared with other causes of injury. Conclusions: Surgical outcome of midshaft clavicle fracture was more affected by initial fracture type and event, and re-reduction and re-fixation of the fracture to obtain a perfect anatomical reduction spending time appears to be unnecessary if rigid fixation is achieved.
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A New Sustain Driving Method for AC PDP : Charge-Controlled Driving Method
Kim, Joon-Yub The Korean Institute of Electrical Engineers 2002 KIEE International Transactions on Electrophysics Vol.c2 No.6
A new sustain driving method for the AC PDP is presented. In this driving method, the voltage source is connected to a storage capacitor, this storage capacitor charges an intermediate capacitor through LC resonance, and the panel is charged from the intermediate capacitor indirectly. In this way, the current flowing into the AC PDP when the sustain discharge occurs is reduced because the current is indirectly supplied from a capacitor, a limited source of charge. Thus, the input power to the output luminance efficiency is improved. Since the voltage supplied to the storage capacitor is doubled through LC resonance, this method call drive an AC PDP with a voltage source of about half of the voltage necessary in the conventional driving methods. The experiments showed that this charge-controlled driving method could drive ail AC PDP with a voltage source of as low as 107V. Using a panel of the conventional structure, luminous efficiency of 1.28 lm/W was achieved.
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Joon Yub Kim,Jinho Lee,Seong-Hun Kim 대한견주관절의학회 2020 대한견주관절학회지 Vol.23 No.3
Background: The purpose of this study was to investigate the clinical differences between open reduction and plate fixation via a deltopectoral approach with allogenous fibular bone graft and a minimally invasive plate osteosynthesis (MIPO), in Neer’s classification two-, three- part proximal humeral fractures. Methods: In this retrospective study, 77 patients with two-, three-part proximal humeral fractures were treated at two different institutions. Clinical and radiological evaluations were performed in 39 patients, who underwent MIPO at one institution (group A), and 38 patients, who underwent a deltopectoral approach with allo-fibular bone graft (group B) at another institution. The results between the groups were compared. Results: The MIPO technique was significantly less time consuming and caused less bleeding than the deltopectoral approach with allo-fibular bone graft (P<0.05). The duration of the fracture union was significantly reduced in group A (14.5±3.4; range, 10–22 weeks) compared to group B (16.4±4.3; range, 12–28) weeks (P<0.05). There were no statistically significant differences between the two groups when evaluating the visual analog scale and Constant scores between the two groups, 1 year postoperatively. In radiological evaluation, there was no difference in radiological outcomes between the two groups. There were no statistically significant differences in malunion between the two groups. Conclusions: The MIPO technique and deltopectoral approach with allo-fibular bone graft for two-, three-part proximal humeral fractures, show similar clinical and radiological results. However, allogenous fibular grafts require longer surgery, cause more bleeding, and result in longer fracture healing time than MIPO technique.
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Study on high speed address driving method using two-step address pulses in AC plasma display panel
Kim, Joon-Yub,Jeong, Yeon Tae,Cho, Byung-Gwon Informa UK (TaylorFrancis) 2017 MOLECULAR CRYSTALS AND LIQUID CRYSTALS - Vol.651 No.1
<P>A new driving waveform using a two-step address voltage is proposed to shorten the discharge delay time of the address period in the AC type plasma display panel. The shortening of the address discharge delay time can reduce the address period occupying about 70% of the driving time in the AC PDP and in the conventional case, a method to prevent the wall charge loss was used by applying the last voltage of the falling ramp waveform to the scan electrode in the reset period is less than the scan voltage. As the voltage difference between the ramp-down voltage and the scan voltage becomes larger, the discharge delay time is shortened. However, at a high address voltage, a misfiring discharge occurs and a driving voltage margin is reduced. Therefore, we propose a new driving waveform that uses the high address voltage and the two-step voltage level at the address electrode to overcome the breakdown voltage of the address circuit. As a result, the address discharge delay time in one pulse of the address period could be reduced about 300ns.</P>
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Analysis of the Shoulder and Elbow Section of the Korean Orthopedic In-training Examination
Joon Yub Kim,Myung Gon Jung,Ki Bum Kwon,Seok Won Chung 대한견주관절의학회 2016 대한견주관절학회지 Vol.19 No.2
Background: The aim of this study was to analyze the questions in the shoulder and elbow section of the Korean Orthopaedic In-Training Examination (KOITE) and compare them with those of the US Orthopaedic In-Training Examination (US OITE). Methods: Twenty-nine questions in the shoulder and elbow section of the KOITE from 2010 to 2014 were analyzed and compared with those of the US OITE (80 questions) by literature review. A thorough analysis of the contents was performed after categorizing as topics, diagnostic tools, treatment modalities, taxonomic classification, and references. Results: The shoulder and elbow section of the KOITE was 5.8% weight which was similar to the US OITE (5.9%). The most commonly appearing topic was anterior labral injury (17.2%) on the KOITE compared to instability and arthritis (21.3%, each) on the US OITE. Magnetic resonance imaging was most frequently appeared imaging modality on the KOITE (41.0%) compared to the radiograph on the US OITE (43.0%). The Latarjet procedure was the most commonly asked treatment modality (22.2%) on the KOITE, whereas arthroplasty (33.3%) on the US OITE. The KOITE showed an even taxonomic classification distribution compared to the US OITE. Campbell’s operative orthopaedics covered 96.6% questions as a reference on the KOITE compared to the Journal of Bone and Joint Surgery, American Volume on the US OITE, which covered 45.0%. Conclusions: This specific analysis shows us current trends of the shoulder and elbow section of the KOITE and it might be developed for use in the educational curricula for the trainee.
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Self-Erasing Discharge Using Ramped-Square Sustain Waveform
Joon-Yub Kim,Heung-Sik Tae,Byung-Gwon Cho 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
In this paper, the eects of an auxiliary pulse on the self-erasing discharge were examined at 100 kHz in the case of adopting the ramped-square sustain pulse in an ac-plasma display panel (ac-PDP). It was found that the auxiliary pulse, which induced no additional discharge current, played a role in strengthening the weak main discharge intensity caused by the previous self-erasing discharge. As a result, the ramped-square sustain waveform with auxiliary pulse improved both the luminance of 20 % and the luminous eciency of 25 % at 100 kHz, when compared with the conventional square sustain pulse.
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