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윤석영,이종영,Yoon, Seog-Young,Lee, Jong-Young Materials Research Society of Korea 2001 한국재료학회지 Vol.11 No.3
사파이어 ($\alpha$-$Al_2$$O_3$) 단결정에 있어 basal slip (0001)1/3<1120>의 전위속도를 4점 곡강도를 이용하여, 측정하였다. 이 곡강도는 온도 $1200^{\circ}C$ 에서 $1400^{\circ}C$ 그리고 응력은 90MPa, 120MPa, 160MPa에서 행하여졌다. 전위속도는 4 점굽힘 시편의 굽힘변위속도에 의해 구하여졌다. 얻어진 전위속도를 이용하여 전위속도의 온도 및 응력 의존성에 대해 검토하였다. 전위속도의 온도의존성을 이용하여 basal slip 전위속도를 위한 활성화에너지를 구하였으며, 그 값은 대략 2.2$\pm$0.4eV이었다. 한편, 전위속도의 응력의존성을 나타내는 응력지수 m은 2.0$\pm$0.2이었다. The basal slip (0001)1/3<1120 > dislocation velocity in sapphire ($\alpha$-$Al_2$$O_3$) single crystals was measured by four-point bending test. The bending experiment was carried out in the temperature range from 120$0^{\circ}C$ to $1400^{\circ}C$ at various engineering stresses 90MPa, 120MPa, and 150MPa. The velocity of such dislocations was estimated from the bending displacement rate of the four-point bend sample. The dependence of temperature and stress in dislocation velocity was investigated. The activation energy for dislocation velocity was determined to be about 2.2$\pm$0.4eV. In addition, the stress exponent (m) describing the stress dependence of dislocation velocities was in the range of 2.0$\pm$0.2.
전신 재발성 화폐상 습진 시기별 한의 유형(습열형(濕熱型), 혈조형(血燥型))에 따른 한방 복합 치료 치험 1례
윤석영,강도영,전현준,전형선,최정화,박수연,정민영,김종한,Yoon, Seok-Yeong,Kang, Do-Young,Cheon, Hyoen-Jun,Jun, Hyung-Sun,Choi, Jeong-Hwa,Park, Soo-Yeon,Jung, Min-Yeong,Kim, Jong-Han 대한한방안이비인후피부과학회 2021 한방안이비인후피부과학회지 Vol.34 No.4
Objectives : The purpose of this study is to report the Korean medicine treatment on whole-body nummular eczema. Methods : This case study was conducted with a 66-year-old female patient who has whole-body nummular eczema treated by Korean medicine. She was treated from 2021.3.30 to 2021.6.28. During the treatment, the two herbal medicines were changed depending on the patient's condition. We treated her with herbal medicine, herbal external preparations and acupuncture treatment. For the evaluation of the results, we used photo comparison, VAS, and DLQI. Results : After the treatment, the nummular eczema lesions of patient was remarkably improved. Also, the VAS grade of other symptoms such as pruritus, burning sense, oozing, crusting and erythema were decreased and DLQI score changed from 27 to 2. Conculsions : This study suggests that Korean medicine treatments are effective for patient with recurrent nummular eczema.
바이오 세라믹 실리카를 이용한 복합 나노입자 구조체의 합성
윤석영(Seokyoung Yoon),이정헌(Jung Heon Lee) 한국세라믹학회 2018 세라미스트 Vol.21 No.3
Here, we introduce various type of inorganic nanostructure synthesized with functional nanoparticles and silica. From two decades ago, functional inorganic nanoparticles have been synthesized and highlighted, now we moved to next level of wet-chemical synthesis. By integrating functional nanoparticles with silica, we were able to synthesize multi-functional nanostructure, which expand the applications of nanoparticles to catalyst, drug carrier, sensors. In this context, silica has been spotlighted due to its versatility. Silica has highly biocompatible, relatively transparent and stable under harsh conditions. Thus it can be used as good supporter to synthesize complex multi-functional nanostructure when mixed with other functional nanoparticles. A various shape of complex nanostructures have been synthesized including core-shell type, yolk-shell type and janus type etc. In this paper, we have described the purposes of synthesizing silica noncomplex and various case studies for biomedical applications and selfassembly.