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Button Osteoma: A Review of Ten Cases
( Soo Yuhl Chae ),( Hyun Bo Sim ),( Min Ji Kim ),( Yong Hyun Jang ),( Seok Jong Lee ),( Do Won Kim ),( Weon Ju Lee ) 대한피부과학회 2015 Annals of Dermatology Vol.27 No.4
Background: Button osteoma presents as small circumscribed ivory-like lumps on the skull vault. Although not rare, its diagnosis can be challenging for dermatologists. Objective: To clarify the clinical characteristics of button osteoma by reviewing 10 cases. Methods: Ten patients diagnosed with button osteoma at the Department of Dermatology, Kyungpook National University Hospital, between January 2011 and August 2014 were enrolled. We retrospectively reviewed medical records and analyzed demographic and clinical characteristics including sex, age, sites, number of lesions, symptoms, duration, histopathological finding, radiological findings, and treatment. Results: All patients presented with an asymptomatic small circumscribed hard lump fixed to a bony structure. There were 9 female and 1 male patient, and the mean age was 54 years (range, 28∼61 years). The most common site was the forehead, and disease duration ranged from 2 weeks to more than 20 years. The differential diagnosis included cranial exostosis, ballooned osteoma, epidermal cyst, and lipoma. Simple radiography, ultrasonography, and computed tomography (CT) were used to make a confirmative diagnosis. Histopathological findings showed lamellated bony structures with poor vascularization. Ostectomy was performed for 5 patients, and no recurrence was detected within an average of 13.4 months after treatment. Conclusion: This review characterized button osteoma. Surgical excision is a useful therapeutic modality after CT-based diagnosis. Further studies with more patients are required to confirm the findings. (Ann Dermatol 27(4) 394∼397, 2015)
( Soo Yuhl Chae ),( Hyun Bo Sim ),( Kyung Hea Park ),( Hyun Wuk Cha ),( Hyun Ho Son ),( Hong Dae Jung ),( Yong Hyun Jang ),( Seok Jong Lee ),( Do Won Kim ),( Weon Ju Lee ) 대한피부과학회 2013 대한피부과학회 학술발표대회집 Vol.65 No.2
Background: Microneedle devices have been useful tools to reduce scarring and wrinkling. In addition, microneedle devices have been used in the treatment of pattern hair loss. Objectives: To investigate the efficacy and safety of home-use microneedle for the treatment of pattern hair loss. Methods: A total of 29 patients were enrolled. They were randomized into 3 groups; 5% minoxidil group, home-use microneedle group and their combination group. They were used twice a week. This study was evaluated through macrophotographic hair count, folliscope hair count, investigator`s global assessment (IGA), subject satisfaction score (SSS) and side effects at 0, 1, 3 and 6 months. Results: In all groups, a significant improvement was not shown in macrophotographic hair count (p>0.05) but in folliscope hair count (p<0.05). There was no statistically significant difference in hair count among the three groups (p>0.05). IGA was increased in three groups and 5% minoxidil group showed a statistically significant increase in IGA (p<0.05). SSS showed an improvement in a combination group. Mild and transient pruritus occurred in one patient of home-use microneedle group. Conclusion: Our study showed that a combination of home-use microneedle and 5% minoxidil is not inferior to 5% minoxidil. Home-use microneedle twice weekly is considered as a safe therapeutic modality to stimulate hair growth and to enhance transdermal delivery.
CURRENT CONTROL FOR A PERMANENT MAGNET SYNCHRONOUS MOTOR UNDER PARAMETER VARIATION
Kwan-Yuhl Cho,Se-Kyo Chung,Myung-Joong Youn 전력전자학회 1992 ICPE(ISPE)논문집 Vol.1992 No.4
A predictive current control which is insensitive to the uncertainties and the parameter variations of a permanent magnet(PM) synchronous motor is presented. The uncertainties in a PM synchronous motor include the back emf harmonics and the inexact estimation of motor parameters. The control input voltage consists of the linear part and the nonlinear part. The linear part generates the required nominal voltage and the nonlinear part compensates the variation in the required voltage from the nominal value due to the parameter variations and the uncertainties. The current errors at each sampling instants are bounded to a certain small value given by the maximum magnitudes of the uncertainties and the parameter variations.<br/>
( Soo Yuhl Chae ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.2
Following topics will be discussed briefly in this session. Chapter 27. Dermatologic surgery Anatomy and approach in dermatologic surgery Skin graft & skin flap Mohs micrographic surgery; mohs surgery Electrosurgery Cryosurgery Hair transplantation Liposuction Autologous fat transplantation Treatment for varicose vein and telangiectasia