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Kwang‑Pil Jeong,Su‑Won Yang,Jin‑Hyuk Choi,Jeong‑Gon Kim 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8
In this study, partially substituted U-type ferrite (Ba4MexCo2-xFe36O60, Me: Mn, Ni, Zn, x=0.5 and 1.0) powders weresynthesized by sol–gel method. The powders were analyzed for phase formation, morphology and magnetic properties byXRD, FE-SEM and VSM respectively. The synthesized ferrite powders were pressed into a series of toroidal shaped samples,in which the weight ratio of parafn to powder was 1:5. The complex scattering parameters were measured by using vectornetwork analyzer in the frequency range of 2–18 GHz and were employed in the calculation of refection loss with variousthicknesses. The minimum refection loss was observed in the substituted nickel sample as−24.4 dB (absorption rate 99.6%)with a thickness of 2.5 mm and the bandwidth was achieved 4.8 GHz (from 7.5 to 12.3 GHz) for refection loss≤ −10 dBin the substituted zinc sample.
베이비붐세대 골프참여자의 건강관심도와 여가몰입 및 가정생활만족의 구조적 관계
설수황(Seol, Su-Hwang),이광용(Lee, Kwang-Yong) 한국사회체육학회 2021 한국사회체육학회지 Vol.- No.83
Purpose: The purpose of this study is to investigate the structural relationship model of health concern, leisure commitment and family life satisfaction of baby-boom generation golf participants. Methods: To achieve the goal of the study, a total 201 surveys collected from golf range in Seoul, Kyuggi, Dae-jeon and Kwang-ju areas were utilized for analysis. Frequency analysis, exploratory factor analysis, reliability analysis, confirmatory factor analysis, correlation analysis and structural equating modeling were conducted using SPSS 18.0 and AMOS 18.0. Results: The results of this study are as follows. 1) Health concerns of baby-boom generation golf participants had a positive effect on leisure commitment (behavioral commitment and cognitive commitment). 2) Health concerns of baby-boom generation golf participants had a positive effect on family life satisfaction. 3) Leisure commitment (behavioral commitment) of baby-boom generation golf participants had a positive effect on family life satisfaction. But leisure commitment (cognitive commitment) of baby-boom generation golf participants did not have an effect on family life satisfaction. 4) The leisure commitment (behavioral commitment) mediated the relationship between health concerns and family life satisfaction in baby-boom generation golf participants. Conclusion: In summary, the findings in this study confirm that the satisfaction of family life increases when immersed in golf.
전국 이부자리 사용에 관한 실태조사 : 1990~2000년의 비교 The Cases in 1990~2000
윤종희,김정숙,성수광 한국의류산업학회 2002 한국의류산업학회지 Vol.4 No.3
The purpose of this study was to improve consumer sleeping life in quality and to suggest producers meet new consumer needs and demands, by examining the nationwide use of bedding, analyzing consumer sleeping life by category and age group, comparing the results with the findings of the nationwide studies by Sung Su-kwang (1992) and Lee Song ja (1995), and identifying the major trend of consumer sleeping life. Results and Discussion The findings of this study were as below: 1. The General Characteristics of the Subjects : Most of the housewives investigated were in their 30s and 40s, with 41.7% and 50.8% respectively. 2. Bedroom : When it comes to bedroom style, 47.8% put beds in their rooms with the Korean under-floor heating system, and 45.4% didn't place beds in their rooms with the same heating system. 3. The Purchase of Bedding : 49.0%, approximately half the homemakers, bought their current bed- clothes at bedding shops, and just 3.2% made them on their own at home. 4. The Use of Bedclothes : In summer, yam (flax, ramie fabric) and a single-layer bed sheet (41.9%) were in use most, followed by a single-layer quilt (34.5%). 5. Bedding Management The most common frequency of bedding disinfection by sunning was once a month (29.4%), followed by once per two weeks (23.9%) and once a week (19.0%) in the order named.
뇌경색후 우울증에서 Homocysteine, Vitamin B12 및 Folate 혈청 농도와 관계
문지수,김광수,유봉구,김종국,김민정 고신대학교의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.1
Background and purpose : Poststroke depression is common and linked to poor prognosis and higher mortality after stroke. Previous studies suggest that high level of serum homocysteine and low levels of vitamin B12 and folate may cause depression. However previous studies has showed large variation concerning the influencing factors of poststroke depression. The purpose of this study was to evaluated the factor that influencing the poststroke depression including serum levels of homocysteine, vitamin B12 and folate. Methods : Beck depression inventory (BDI) was obtained in 62 patients with cerebral infarction, and the patients were divided into non-depression group (BDI ≤ 13) and depression group (BDI ? 14) according to their BDI scores. Then, we compared serum homocysteine, vitamin B12, folate, age, sex, Barthel index, Scandinavian stroke scale, acute aphasia screening protocol, Korean version of mini-mental state examination and ischemic brain lesion between NDG and DG. And also calculate the correlations between serum homocysteine, vitamin B12 and folate with severity of poststroke depression. Results : The NDG were 41 patients (66.1%) and DG were 21 patients (33.9%). Serum homocysteine, vitamine B12 and folate were not different between the groups, and these levels were not correlated with the severity of BDI. The age, sex, BI, SSS, AASP, K-MMSE and location of ischemic stroke were not different between the groups. Conclusion : Frequency of poststroke depression were high in patients with acute ischemic stroke. In contrast with previous studies, poststroke depression was not influenced by the serum levels of homocysteine, vitamin B12 and folate. And poststroke depression was not influenced by age, sex, physical handicap after stroke, aphasia, cognitive function and location of ischemic stroke.
실리콘 이온주입 SiO_2층의 나노결정으로 부터의 광루미네센스
김광희,오항석,장태수,권영규,이용현 한국센서학회 2002 센서학회지 Vol.11 No.3
실리콘 기판 위에 형성한 열산화막에 실리콘이온을 주입하고 열처리를 수행한 후, 광루미네센스(photoluminescence:PL) 스펙트럼을 조사하였다. 실리콘 이온도즈의 변화와 열처리 온도의 변화에 따른 PL스펙트럼을 조사하고, 이를 TEM과 XRD 데이터와 비교하여 분석한 결과, 광루미네센스 특성은 산화막내의 실리콘 나노결정으로부터 기인함을 알 수 있었다. 또 산화막을 1분 간격으로 습식 식각하면서 매 식각 시마다 PL스펙트럼을 관측하여 그 변화를 조사하였다. 이러한 실험을 통하여 산화막내에 분포하고 있는 실리콘 나노결정의 크기와 그 수가 PL피크 파장과 강도에 직접적으로 영향을 줌을 알 수 있었다. Photoluminescence(PL) properties of Si^+ -implanted SiO_2 film, which was thermally grown on c-Si substrate, is reported. We have compared room temperature photolurninescence (PL) spectra of the samples which was made in several kinds of implantation, subsequent annealing and SiO_2 film thickness. XRD data was correlated with the PL spectra. Silicon nanocrystals in SiO_2 film is considered as the origin of the photoluminescence. PL spectra was investigated after wet etching of the SiO_2 film by using BOE (Buffered Oxide Etchant) at every one minute. PL peak wavelength was varied as the etching is proceeded. These results indicate that the quantity and the distribution of dominant size of Si nanocrystals in SiO_2 film seem to have a direct effect on PL spectrum.
플라즈마 질화처리된 Ti-6A1-4V 합금의 고온 산화 거동에 관한 연구
김광배,배현근,이종수,김영인 한국 항공대학교 항공산업기술연구소 1998 航空宇宙産業技術硏究所 硏究誌 Vol.8 No.-
Ti-6Al-4V 합금에 d. c. 플라스마 질화처리를 실시하고 600℃, 650℃, 700℃의 온도에서 200시간 등온 산화 시험을 실시하여 플라스마 질화처리를 실시하지 않은 Ti-6Al-4V 합금과의 고온 산화 거동을 비교 연구 하였다. 산화 거동은 산화후 시편의 중량 변화량을 측정하여 분석하였으며, 형성층의 미세조직을 관찰 및 상분석을 위하여 주사 전자 현미경 및 XRD를 이용하였다. Ti-6Al-4V합금은 산화 시험 온도 및 산화 시간 증가에 따라 산화 시험후 무게가 증가함을 보였다. 플라스마 질화처리된 Ti-6Al-4V함급의 경우에도 산화 온도 및 산화 시간 증가에 따라 산화 시험후 무게가 증가함을 보였다. 플라스마 질화에 의해 합금표면에 TiN 및 Ti2N의 질화층을 형성시켰으나 산화 시험 온도 범위에서 Ti02층의 형성을 근본적으로 억제할 수는 없었다. 그러나 플라스마 질화처리된 시편의 경우, 플라스마 질화처리된 시편에 비해서 산화 후 무게 증가량이 현저하게 감소하였다. 이는 질화층위에 산화층이 형성되기는 하지만 질화층이 산소의 내부 확산을 저지하는 장벽으로 작용하여 형성 산화층의 성장이 억제된 것에 기인하는 것으로 판단되었다. Plasma nitriding was performed at Ti-6Al-4V alloy. Isothermal oxidation test was carried out at 600℃, 650℃, 700℃ for 200 hours. Oxidation behavior was studied by measuring weight change of specimen after oxidation test. Microstructure of nitrided and oxidized layer was characterized by SEM, XRD, EPMA analysis. Weight gain rate transition of Ti-6Al-4V alloy is parabolic to linear plasma nitrided layer of Ti-6Al-4V was dissociated proportional to oxidation temperature and time. TiN and Ti₂N layer formed by plasma nitriding didn't supress TiO₂formation on the nitride surface. In the case of plasma nitrided Ti-6Al-4V alloy, weight gain rate was sustained at initial oxidation period but decomposed at high temp. Nitrded layer was thermally unstable.