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( Ji Won Gye ),( Ji Yeon Yoo ),( Sung Ku Ahn ),( Ji Eun Kwon ),( Chan Hee Nam ),( Ji Seok Kim ),( Jee Young Kim ),( Byung Cheol Park ),( Myung Hwa Kim ),( Seung Phil Hong ) 대한피부과학회 2013 대한피부과학회 학술발표대회집 Vol.65 No.2
Background: Non-melanoma skin cancers are caused mainly by prolonged UV exposure. However, there is no effective prevention other than avoiding sun exposure. Recently, ablative fractional laser(FL) treatment is actively being carried out for facial rejuvenation. Objectives: We elucidated whether the occurrence of skin tumors caused by exposure to UV can be decreased by multiple sessions of ablative CO2 FL. Methods: Two groups of hairless mice were treated with either ablative CO2 FL or nothing at 3-week intervals during the 20 weeks of UV exposure period. At the 30-week, representative tumors were taken to evaluate the type of tumor and check the mRNA expression levels of the MMP-13 and type-1 procollagen. In addition, we evaluated the change of skin barrier function at 12 weeks and 20 weeks. Results: At 30 weeks, the UV plus FL treated group(group I) showed a significantly lower average size of tumor and a lower occurance rate of tumors than the UV only treated group(group II). Tumors in the group II showed more malignant progression. And the groups II showed significantly greater trans-epidermal water loss than the group I. The group II showed significantly decreased collagen and elastic contents than the group I. The group I presented a higher mRNA level of type-1 procollagen, and a lower level of MMP-13 than the group II. Conclusion: Ablative CO2 FL can be effective for not only skin rejuvenation but also for prevention of skin tumors induced by UV.
Oh, Gye-Jeong,Yoon, Ji-Hye,Vu, Van Thi,Ji, Min-Kyung,Kim, Ji-Hyun,Kim, Ji-Won,Yim, Eun-Kyung,Bae, Jung-Chan,Park, Chan,Yun, Kwi-Dug American Scientific Publishers 2017 Journal of nanoscience and nanotechnology Vol.17 No.4
<P>The purpose of this study was to examine the surface characteristics of bioactive glass-infiltrated zirconia specimens that underwent different hydrofluoric acid (HF) etching conditions. Specimens were classified into the following six groups: Zirconia, Zirliner, Porcelain, Bioactive glass A1, Bioactive glass A2, and Bioactive glass A3. Zirliner and porcelain were applied to fully sintered zirconia followed by heat treatment. Bioactive glass was infiltrated into presintered zirconia using a spin coating method followed by complete sintering. All the specimens were acid-etched with 10% or 20% HF, and surface roughness was measured using a profiler. The surface roughness of the zirconia group was not affected by the etching time or the concentration of the acid. The roughness of the three bioactive glass groups (A1, A2, and A3) was slightly increased up until 10 minutes of etching. After 1 hour of etching, the roughness was considerably increased. The infiltrated bioactive glass and acid etching did not affect the adhesion and proliferation of osteoblasts. This study confirmed that surface roughness was affected by the infiltration material, etching time, and acid concentration. For implant surfaces, it is expected that the use of etched bioactive glass-infiltrated zirconia with micro-topographies will be similar to that of machined or sand-blasted/acid-etched (SLA) titanium.</P>
계지원 ( Ji Won Gye ),홍승필 ( Seung Phil Hong ),김명화 ( Myung Hwa Kim ),박병철 ( Byung Cheol Park ) 대한피부과학회 2013 대한피부과학회지 Vol.51 No.3
Background: As the number of dermatologic surgical procedures increases, home care wound management is growing in frequency. Objective: The aim of this study was to evaluate the efficacy and surgical site infection rate of home care wound manageme nt according to the use of oral antibiotics and the characteristics of the wound and of the patient. Methods: Our study included 207 patients that had undergone a dermatologic surgical procedure and the subsequent management of their wounds in the home. We checked overall infection rate of home care wound management and compared the result according to the use of oral antibiotics. We evaluated surgical site infection rate after we classified each surgical wound based on age, sex, surgical method, site, size, and depth. In addition, we surveyed efficacy of home care wound management. Results: Overall surgical site infection rate was 1.86%, and the infection rate was not significantly different between the group that utilized home care wound management without oral antibiotics and the group with oral antibiotics (p >0.05). There was no statistically significant difference of surgical site infection rate according to sex, age, wound`s size and depth (p>0.05). However, patients with younger age, male sex, greater size, and depth of wounds showed a numerical increase in surgical site infection rate. Staged partial excision for nevus sebaceous in scalp showed significantly higher rate of surgical site infection (p<0.05). In our survey, most patients preferred home care wound management after dermatologic surgical procedures and patients were able to perform the wound care well. Conclusion: We expect to utilize home care wound management after dermatologic surgical procedures, provided that physicians appropriately educate patients and their caretakers on proper dressings. (Korean J Dermatol 2013;51(3):173∼178)
Evaluation of the Fitness of Glass-Infiltrated Zirconia Core in Maxillary Central Incisor
Kim, Ji-Won,Oh, Gye-Jeong,Lim, Hyun-Pil,Yun, Kwi-Dug,Park, Chan,Lee, Kyung-Ku,Ban, Jae-Sam,Park, Sang-Won,Yim, Eun-Kyung American Scientific Publishers 2018 Journal of nanoscience and nanotechnology Vol.18 No.2
<P>The purpose of this study was to evaluate the fitness of zirconia cores according to the amount and treated surface of glass infiltration. A maxillary right central incisor customized abutment was milled to have a 6 degrees slope and a 1 mm deep chamfer margin and was manufactured in an intaglio mold using silicone impression material. Fifty-six stone dies were produced by injecting high strength dental stone into a mold and then zirconia cores were milled with CAD/CAM systems. The control group (Control) used non glass-infiltrated zirconia, and the experiment group was divided by one with the glass and distilled water ratio of 1:300 and the other with the ratio of 1:100. Each group was divided into subgroups by glasstreated surface:external surface infiltration, internal surface infiltration, and both surface infiltration. The zirconia cores sintered after glass infiltration were attached to the stone dies and then cut. Afterwards, the absolute marginal discrepancies and internal gaps of the buccal and lingual sides were measured. The buccal absolute marginal discrepancies and lingual internal gaps were influenced by the glass infiltration amount (p < 0.05); while fitness of zirconia core were not affected by the glasstreated surface (p > 0.05). As a result of the above experiments, the glass-infiltrated zirconia cores showed a clinically acceptable fitness, which is within 120 mu m. This means that glass infiltration can be clinically used.</P>
P159 : Solar lentigines treated by using Q-switched ND:YAG
( Ji Seok Kim ),( Chan Hee Nam ),( Jee Young Kim ),( Ji Won Gye ),( Seung Phil Hong ),( Myung Hwa Kim ),( Byung Cheol Park ) 대한피부과학회 2013 대한피부과학회 학술발표대회집 Vol.65 No.2
Background: Laser therapy is known to be superior to other classic methods for treatment of solar lentigines and Q-switched Nd:YAG, alexandrite, and ruby have shown a good result. Objectives: Using colorimeter, we tried to make an objective evaluation of efficacy and side effects of Q-switched Nd:YAG laser for the treatment of solar lentigines. Methods: A total of twenty Korean volunteers with solar lentigines on face were enrolled. Each patient received two sessions of 535nm Q-switched Nd:YAG laser treatment with 4 weeks intervals, and had additional 4 weeks of follow-up. All were treated with 20 nanoseconds pulse width, energy of 0.7-0.8 J/cm2 and 3-4 mm spot size. Improvement was assessed based on the comparison of pre- and post-treatment photographs. For more objective measurement, we checked the same spot of solar lentigo for three times using colorimeter at both baseline and final visit, and got the average value. Results: Of the 20 patients, 10 patients (50.0%) showed excellent response after two treatment sessions and 4 patients (20%) had marked response on the investigator global assessment. The average improvement was 72.25%. The ‘B’ value decreased from 18.69 to 16.89, indicating that the degree of the brown pigmentation has decreased. Conclusion: Based on the study, it could be speculated that the Q-switched Nd:YAG has a good effect on the treatment of solar lentigines which has been confirmed with objective and subjective measurement by using colorimeter.
Analysis of an HTS coil for large scale superconducting magnetic energy storage
Ji-Young Lee,Seyeon Lee,Kyeongdal Choi,Sang Ho Park,Gye-Won Hong,Sung Soo Kim,Ji-Kwang Lee,Woo-Seok Kim 한국초전도.저온공학회 2015 한국초전도저온공학회논문지 Vol.17 No.2
It has been well known that a toroid is the inevitable shape for a high temperature superconducting (HTS) coil as a componentof a large scale superconducting magnetic energy storage system (SMES) because it is the best option to minimize a magneticfield intensity applied perpendicularly to the HTS wires. Even though a perfect toroid coil does not have a perpendicularmagnetic field, for a practical toroid coil composed of many HTS pancake coils, some type of perpendicular magnetic fieldcannot be avoided, which is a major cause of degradation of the HTS wires. In order to suggest an optimum design solution foran HTS SMES system, we need an accurate, fast, and effective calculation for the magnetic field, mechanical stresses, and storedenergy. As a calculation method for these criteria, a numerical calculation such as an finite element method (FEM) has usuallybeen adopted. However, a 3-dimensional FEM can involve complicated calculation and can be relatively time consuming, whichleads to very inefficient iterations for an optimal design process. In this paper, we suggested an intuitive and effective way todetermine the maximum magnetic field intensity in the HTS coil by using an analytic and statistical calculation method. We wereable to achieve a remarkable reduction of the calculation time by using this method. The calculation results using this method forsample model coils were compared with those obtained by conventional numerical method to verify the accuracy and availabilityof this proposed method. After the successful substitution of this calculation method for the proposed design program, a similarmethod of determining the maximum mechanical stress in the HTS coil will also be studied as a future work.