• 대한치과기공학회지
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• 제29권1호
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• pp.133-138
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• 2007

In this study, the castability and of commercially pure titanium(c.p.Ti) grade according to the casting condition which are the vacuum condition in casting machine and mold temperature of investment, was investigated. Argon-arc melt/centrifugal casting machine was used for casting the specimens. The microstructure and mechanical properties were evaluated by using optical microscope. The results were as follows; 1. It could make a sure that there's relatively not much defect of casting body of c.p.Ti according to the deference of air pressure. 2. It could make sure that it formed porosity on the surface inside of the casting body of c.p.Ti according to deferent temperature. and on excellent castability was below $200^{\circ}C$ 3. As the mold temperature of investment was increased, the lamellar structure of phase and coarse grains were shown, especially under 42MPa.

• 가족자원경영과 정책
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• 제5권1호
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• pp.1-13
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• 2001

The purpose of this study was not only to identify real-life conditions of Korean-Chinese in Korea(clothing habits, eating habits, housing habits, economic life and leisure activities) but also to reveal the related variables that shall affect life quality. The subjects were selected from Korean-Chinese in Korea related to ‘Compatriots House’. The survey was conducted from June 20th to July 5th, 2000. A total of 225 questionnaires out of 350 were used as the final data analysis. All data were analyzed using the SAS/PC for frequency, percentage, F-test and Regression analysis. The study revealed the following results. 1. Significant differences were found in life quality of Korean-Chinese in Korea according to age(p<.05), optimum income (p<.001), health condition(p<.001), education level(p<.005), and entry motivation(p<.05). 2. Variable such as optimum income(β=.334) education level(β=-.190), monthly income(β=.170), health condition(β=.151), and self-esteem(β=.133) affected life quality of Korean-Chinese in Korea. Korean-Chinese’s life quality was explained by these variable(35%). The optimum income variable was the primary influential factor.

• 생명과학회지
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• 제9권2호
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• pp.169-175
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• 1999

Salmonella typhimurum은 생활사 동안에 다양한 환경과 접하게 된다. S. typhimurium은 오염된 웅덩이에서 숙주의 phgolysosome에 이르기까지 생태계에 널리 분포하면서 산성 스트레스를 경험하며 또한 생존할 수 있다. Salmonella 이와 같은 산저항능은 Acid Tolerance Response (ATR)에 의해 획득된다. 약산의 pH에 적응된 S. typhimurium은 낮은 pH 영역에서 생존할 수 있는 일종의 대항능을 갖게되며, 이런 생존 능력은 복잡한 유전적 유도현상 결과로 해석된다. Salmonella 있어서 ATR은 RpoS 의존적 그리고 RpoS 비의존적 현상으로 구분되며, 특히 혐기적 조건(5% $CO_2$, 5% H$_2$, 90% $N_2$)에서 rpoS$\Omega$Ap는 UK1과 동일한 ATR을 나타내어, 혐기적 조건의 ATR은 RpoS 비의존적인 것으로 판명되었다. P22와 MudJ (Km, lacZ)를 이용한 gene fusion기법과 sodium acetate (pH4.5)를 이용한 돌연변이체 분리방법을 병행하여 산민감성의 형질을 나타내는 LE487 aatA::MudJ를 얻었다. antA 는 Salmonella의 유전자 지도상에서 12min에 위치하는 것으로 조사되었다. antA는 혐기적 조건(5% $CO_2$, 5% H$_2$, 90% $N_2$)하의 pH4.3 조건에서 야생형 Salmonella 비해서 매우 높은 산민감성을 보여주었다. 그러므로 antA는 혐기적 ATR에 있어서 산적응 기전에 관여하는 중요한 유전자로 확인되었다.

• Child Health Nursing Research
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• 제24권1호
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• pp.101-108
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• 2018

Purpose: This study aimed to identify the effects of the mother-medical staff partnership on mothers' condition management ability for children with chronic allergic diseases. Methods: A total of 109 Korean mothers caring for a child with a chronic allergic diseases, identified according to the allergic march, such as food allergy, atopic dermatitis, allergic rhinitis, and allergic asthma, were recruited from the pediatric department of a general hospital in Seoul through convenience sampling. Data were collected using structured self-reported questionnaires from August 1, 2017 to October 31, 2017. and analyzed by descriptive statistics and multiple regression using SPSS version 22.0. Results: The Mother-medical staff partnership had a statistically significant effect on mothers' condition management ability for children with chronic allergic diseases (p<.05). Among the general characteristics, satisfaction with nursing services had a statistically significant effect on mothers' condition management ability (p<.05). Conclusion: In conclusion, strategies to support children with chronic allergic diseases, as well as their caregivers, should consider the mother-medical staff partnership as part of a family-centered approach.

• East Asian mathematical journal
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• 제5권1호
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• pp.1-23
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• 1989

Let $S_p*({\alpha},{\beta},{\mu})$ denote the class of functions $f(z)=z^p-{\sum}{\limit}^{\infty}_{n=1}a_{p+n}\;z^{p+n}(a_{p+n}{\geq}o,\;p{\in}N)$ analytic and p-valent in the unit disc $U=\{z:{\mid}z{\mid}<1\}$ and satisfy the condition $${\mid}\frac{\frac{zf'(z)}{f(z)}-p}{\mu\frac{zf'(z)}{f(z)}+p-(1+\mu)\alpha}\mid<\beta,\;z{\in}U$$, where $o{\leq}{\alpha} and $o\leq\mu\leq1$. Further f(z) is said to belong to the class $C_p*({\alpha},{\beta},{\mu})\;if\;zf'(z)/p{\in}S_p*(\alpha,\beta,\mu)$. In this paper we obtain for these classes sharp results concerning coefficient estimates, disortion theorems, closure theorems, Hadamard products and some distortion theorems for the fractional calculus.

• 상하수도학회지
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• 제28권2호
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• pp.207-215
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• 2014

Wastewater containing heavy metals such as copper (Cu) and nickel (Ni) is harmful to humans and the environment due to its high toxicity. Crystallization in a fluidized bed reactor (FBR) has recently received significant attention for heavy metal removal and recovery. It is necessary to find optimum reaction conditions to enhance crystallization efficacy. In this study, the effects of crystallization reagent and pH were investigated to maximize crystallization efficacy of Cu-S and Ni-S in a FBR. CaS and $Na_2S{\cdot}9H_2O$ were used as crystallization reagent, and pH were varied in the range of 1 to 7. Additionally, each optimum crystallization condition for Cu and Ni were sequentially employed in two FBRs for their selective removal from the mixture of Cu and Ni. As major results, the crystallization of Cu was most effective in the range of pH 1-2 for both CaS and $Na_2S{\cdot}9H_2O$ reagents. At pH 1, Cu was completely removed within five minutes. Ni showed a superior reactivity with S in $Na_2S{\cdot}9H_2O$ compared to that in CaS at pH 7. When applying each optimum crystallization condition sequentially, only Cu was firstly crystallized at pH 1 with CaS, and then, in the second FBR, the residual Ni was completely removed at pH 7 with $Na_2S{\cdot}9H_2O$. Each crystal recovered from two different FBRs was mainly composed of CuxSy and NiS, respectively. Our results revealed that Cu and Ni can be selectively recovered as reusable resources from the mixture by controlling pH and choosing crystallization reagent accordingly.

• 한국치위생학회지
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• 제14권4호
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• pp.547-553
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• 2014

Objectives : This research aims to analyze the relationship between the state of mental illness and oral health management of mental patients in mental health care institutions. Methods : The data were randomly selected from 474 patients in mental health care institutions. and analyzed by SPSS WIN 12.0 program. Results : Schizophrenia accounted for 79.5%(337 patients) ; alcohol dependency, 5.3%(25 patients) ; mental retardation, 2.7%(13 patients) ; mental development disorder, 3.0%(14 patients) ; mental delusion and dementia, 7.6%(36 patients). Those who were in 40s had the highest dental caries of 3.95 and the highest remaining teeth of 26.76 were shown in the 20s. The correlation between remaining teeth and mental retardation was the highest, measuring 22.38(p<.05). Those who were in 70s had the serious periodontal condition that accounted for 41.3%(12 patients)(p<.05). The correlation coefficient for all factors-dental caries, remaining teeth, need for scaling, and periodontal condition-between mental illness condition and oral health were all positive(p <.05). The regression analysis resulted in the formula Y(mental health condition)=2.999+0.166(dental aries)-0.028(remaining teeth). Conclusions : Those who had mental illness had very poor and serious dental caries and periodontal diseases, so it is necessary to manage the dental health care for the mentally ill patients.

• Journal of applied mathematics & informatics
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• 제26권3_4호
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• pp.779-784
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• 2008

We show that $\mathbb{Z}[\sqrt{-p}]$ is not a unique factorization domain (UFD) but a factorization domain (FD) with a condition $1\;+\;a^2p\;=\;qr$, where a and p are positive integers and q and r are positive primes in $\mathbb{Z}$ with q < p. Using this result, we also construct several specific non-unique factorization domains which are factorization domains. Furthermore, we prove that an integral domain $\mathbb{Z}[\sqrt{-p}]$ is not a UFD but a FD for some positive integer p.

• Journal of applied mathematics & informatics
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• 제24권1_2호
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• pp.421-426
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• 2007

The problem of vertex labeling with a condition at distance two in a graph, is a variation of Hale's channel assignment problem, which was first explored by Griggs and Yeh. For positive integer $p{\geq}q$, the ${\lambda}_{p,q}$-number of graph G, denoted ${\lambda}(G;p,q)$, is the smallest span among all integer labellings of V(G) such that vertices at distance two receive labels which differ by at least q and adjacent vertices receive labels which differ by at least p. Van den Heuvel and McGuinness have proved that ${\lambda}(G;p,q){\leq}(4q-2){\Delta}+10p+38q-24$ for any planar graph G with maximum degree ${\Delta}$. In this paper, we studied the upper bound of ${\lambda}_{p,q}$-number of some planar graphs. It is proved that ${\lambda}(G;p,q){\leq}(2q-1){\Delta}+2(2p-1)$ if G is an outerplanar graph and ${\lambda}(G;p,q){\leq}(2q-1){\Delta}+6p-4q-1$ if G is a Halin graph.

• 감성과학
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• 제15권1호
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• pp.9-16
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• 2012

크림은 피부의 보습효과를 비롯하여 유연기능 등 다양한 목적으로 사용된다. 최근에는 천연향 성분의 크림제품이 출시되면서 그 기능에 관심이 모아지고 있다. 본 연구에서는 곽향, 유향, 백단향, 무향 그리고 새로 개발된 조합향(S6) 5개의 천연향을 대상으로 심리생리적 인체 영향을 평가하였다. 첫 번째로 대전지역에 거주하는 20~30대 여성 100명을 대상으로 감성 형용사를 이용한 주관적 평가를 수행하였다. 그 결과, 조합향을 가장 선호하는 것으로 나타났다. 두 번째로 주관적 평가에 참가한 응답자 중 20명을 대상으로 EEG와 ECG, GSR을 측정하였다. EEG 분석 결과, 각 조건에서 알파파의 비율이 높게 나타나는 것을 확인하였다. 통계적 분석 결과, 조합향에서 유의하게 나타나 긴장완화 효과가 가장 큰 것을 알 수 있었다($p$ < 0.05). 이런 결과는 심전도와 피부전기저항 측정값에서도 동일한 경향으로 나타났다. 세 번째로 조합향 제품을 사용하였을 때 피부상태를 측정하였다. 그 결과 피부 온도와 습도, 피부 움직임 속도가 증가하였다. 보습효과와 탄력 효과가 있음을 확인할 수 있었다.