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Spark Plasma Sintering으로 제조한 Li<sub>2</sub>O-2SiO<sub>2</sub> 유리 소결체의 전기적 특성
윤혜원,송철호,양용석,윤수종,Yoon, Hae-Won,Song, Chul-Ho,Yang, Yong-Seok,Yoon, Su-Jong 한국재료학회 2012 한국재료학회지 Vol.22 No.2
A $Li_2O-2SiO_2$ ($LS_2$) glass was investigated as a lithium-ion conducting oxide glass, which is applicable to a fast ionic conductor even at low temperature due to its high mechanical strength and chemical stability. The $Li_2O-2SiO_2$ glass is likely to be broken into small pieces when quenched; thus, it is difficult to fabricate a specifically sized sample. The production of properly sized glass samples is necessary for device applications. In this study, we applied spark plasma sintering (SPS) to fabricate $LS_2$ glass samples which have a particular size as well as high transparency. The sintered samples, $15mm\phi{\times}2mmT$ in size, ($LS_2$-s) were produced by SPS between $480^{\circ}C$ and $500^{\circ}C$ at 45MPa for 3~5mim, after which the thermal and dielectric properties of the $LS_2$-s samples were compared with those of quenched glass ($LS_2$-q) samples. Thermal behavior, crystalline structure, and electrical conductivity of both samples were analyzed by differential scanning calorimetry (DSC), X-ray diffraction (XRD) and an impedance/gain-phase analyzer, respectively. The results showed that the $LS_2$-s had an amorphous structure, like the $LS_2$-q sample, and that both samples took on the lithium disilicate structure after the heat treatment at $800^{\circ}C$. We observed similar dielectric peaks in both of the samples between room temperature and $700^{\circ}C$. The DC activation energies of the $LS_2$-q and $LS_2$-s samples were $0.48{\pm}0.05eV$ and $0.66{\pm}0.04eV$, while the AC activation energies were $0.48{\pm}0.05eV$ and $0.68{\pm}0.04eV$, respectively.
여성 대변실금에 대한 연구 - 분만력, 분만방법을 중심으로 -
윤혜원(Hae Won Yoon),배철성(Cheol Seong Bae) 대한산부인과학회 1999 Obstetrics & Gynecology Science Vol.42 No.12
Objectives: To evaluate the effect of parity & delivery method on female fecal incontinence. Method: Based on 213 cases of 4 different delivery method and 40 cases of one non-delivery group, a retrospective analysis of the prevalence of female fecal incontinence, between January 1996 and December 1998, was done. With delivery mode, 4 different groups were: first vaginal delivery group , two or more vaginal deliveries group, first cesarean section group, and first vaginal delivery followed by cesarean section group. All subjects were examined by questionaire or phone about the experience of fecal incontinence after delivery. In cases of fecal incontinence , we reviewed the obstetric complications with medical records. Result: There was no fecal incontinence in the non-delivery group. The incidence of fecal incontinence in the two or more vaginal delivery group(11.7%, 9/77) and the first vaginal delivery followed by cesarean section group(18.1%, 8/44) was higher than the first vaginal delivery group(6.8%, 3/44), and the first cesarean section group(2.1%, 1/48)(P<0.05). The obstetric complications in fecal incontinence cases were: a prolonged second stage, anal sphincter laceration, vacuum extraction, a large baby etc. Conclusion: Fecal incontinence was significantly correlated with the number of vaginal deliveries and obstetric complications during delivery. Fecal incontinence after the first vaginal delivery or vaginal delivery followed by cesarean section are very important factors in choosing the next delivery method.
Lithium disilicate 유리의 입자크기에 따른 결정화 기구
최현우,윤혜원,양용석,윤수종,Choi, Hyun Woo,Yoon, Hae Won,Yang, Yong Suk,Yoon, Su Jong 한국재료학회 2016 한국재료학회지 Vol.26 No.1
We have investigated the crystallization mechanism of the lithium disilicate ($Li_2O-2SiO_2$, LSO) glass particles with different sizes by isothermal and non-isothermal processes. The LSO glass was fabricated by rapid quenching of melt. X-ray diffraction and differential scanning calorimetry measurements were performed. Different crystallization models of Johnson-Mehl-Avrami, modified Ozawa and Arrhenius were adopted to analyze the thermal measurements. The activation energy E and the Avrami exponent n, which describe a crystallization mechanism, were obtained for three different glass particle sizes. Values of E and n for the glass particle with size under $45{\mu}m$, $75{\sim}106{\mu}m$, and $125{\sim}150{\mu}m$, were 2.28 eV, 2.21 eV, 2.19 eV, and ~1.5 for the isothermal process, respectively. Those values for the non-isothermal process were 2.4 eV, 2.3 eV, 2.2 eV, and ~1.3, for the isothermal process, respectively. The obtained values of the crystallization parameters indicate that the crystallization occurs through the decreasing nucleation rate with a diffusion controlled growth, irrespective to the particle sizes. It is also concluded that the smaller glass particles require the higher heat absorption to be crystallized.
김경원(Kyoung Won Kim),하준영(Jun Young Ha),김도균(Do Gyun Kim),김종호(Jong Ho Kim),양회생(Hoe Saeng Yang),윤혜원(Hae Won Yoon),심재철(Jae Cheol Sim),김욱년(Wook Nyun Kim),이경윤(Kyung Yoon Eah) 대한산부인과학회 2001 Obstetrics & Gynecology Science Vol.44 No.8
Hypertensive encephalpathy is defined as severe hypertension in association with headache, nausea and vomiting, visual disturbances, confusion, stupor and coma. The pathophysiological mechanism is incompletely understood and causing as a result of failure of the upper limit of cerebral vascular autoregulation. Magnetic resonance imaging shows a characteristics posterior leukoencephalopathy, predominantly affects the white matter of the parietal and occipital lobes. Hypertensive encephalopathy are potentially reversible with timely and appropriate treatment. We experienced a case of hypertensive encephalopathy after normal vaginal delivery and report this case with a brief review of the literatures.
Cu 첨가가 Mo-Cu-N 코팅의 미세구조와 기계적 특성에 미치는 영향
김수빈(Soobyn Kim),윤혜원(Hae-Won Yoon),이한찬(Han-Chan Lee),문경일(KyoungIl-Moon),홍현선(Hyun Seon Hong) 한국표면공학회 2019 한국표면공학회지 Vol.52 No.4
Mo-N based coatings have been studied for enhancing mechanical characteristics of thin films. In the case of Mo-X-N coatings, the microstructure and mechanical properties can be affected by the addition of the third element. In this work, Mo-Cu-N coatings were successfully fabricated with varying the Cu content from 4.5 at% to 31 at% by the co-sputtering method. Thus, properties of the coatings were analyzed by EDS, SEM, XRD, AFM, nano indentation and scratch test techniques. From observed results, MoxN bonds were made in a nitrogen atmosphere and Cu elements were present at grain boundaries. In addition, coatings with the Cu content above 14 at% had a Cu3N peak in the XRD results. Thus, it is suggested that the formation of Cu3N phase affected the microstructure and mechanical properties of Mo-Cu-N coatings. Mechanical properties of Mo-Cu-N coatings were found to be relatively better at Cu content of about 12 at%.
남,녀 대학생의 성격특질과 의복태도에 따른 유행관심도 연구
정삼호 ( Sham Ho Chung ),윤혜원 ( Hae Won Yoon ) 중앙대학교 생활문화산업연구소(구 생활과학연구소) 2008 생활과학논집 Vol.27 No.-
This study began with the intention to clarify the effects of social tendency on the personality traits and clothing attitudes of undergraduates. Accordingly, in this study, for the purpose of identifying the different personality traits of male and female undergraduates who have been affected by the modem popular culture, from older generation, undergraduates were surveyed nationwide via cyber lectures. The results of this study are as follows: First, as a result of comparing the personality traits of male and female undergraduates, they showed masculinity and feminity, respectively; and as a result of examining closely their extroversion and introversion, male undergraduates exhibited higher introversion, whereas female under graduates exhibited higher extroversion. For emotionality, both of the two groups were stable in the emotional aspect and female undergraduates were more stable than male ones. For thoughness, both the groups indicates the low levels. Second, as a result of investigating the clothing attitudes among male and female undergraduates, the findings concerning interest in the current fashion, clothing conformity, practicality, decoration/aesthetics factors suggested high interest in clothing in both the groups.
들깨유 섭취가 흰쥐의 출혈시간, 트롬복산 생성 및 혈소판의 지방산 조성에 미치는 영향
한용남(Yong Nam Han),윤혜원(Hae Won Yoon),김숙희(Sook Hee Kim),한병훈(Byung Hoon Han) 한국생약학회 1987 생약학회지 Vol.18 No.1
Male rats were fed diets containing perilla oil, sardine oil or corn oil for 15 weeks in order to investigate their antithrombotic effects. Rats given perilla oil and sardine oil diets showed significantly longer bleeding time, and lower level of malondialdehyde generation during thrombin-induced aggregation of platelets than rats given corn oil. With regard to the composition of platelet fatty acid, the ratio of eicosapentaenoic acid (EPA) (20:5ω3) to arachidonic acid (20:4ω6) of perilla oil, sardine oil and corn oil treated rats were 0.54, 0.96 and 0.01, respectively, suggesting that linolenic acid(18:3ω3) of perilla oil was metabolized to EPA which is known to have antithrombotic activity.