• 대한기계학회논문집A
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• 제29권9호
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• pp.1209-1216
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• 2005

Three methods for design sensitivity such as numerical differentiation, analytical method and semi-analytical method have been developed for the last three decades. Although analytical design sensitivity analysis is exact, it is hard to implement for practical design problems. Therefore, numerical method such as finite difference method is widely used to simply obtain the design sensitivity in most cases. The numerical differentiation is sufficiently accurate and reliable for most linear problems. However, it turns out that the numerical differentiation is inefficient and inaccurate because its computational cost depends on the number of design variables and large numerical errors can be included especially in nonlinear design sensitivity analysis. Thus semi-analytical method is more suitable for complicated design problems. Moreover semi-analytical method is easy to be performed in design procedure, which can be coupled with an analysis solver such as commercial finite element package. In this paper, implementation procedure for the semi-analytical design sensitivity analysis outside of the commercial finite element package is studied and computational technique is proposed, which evaluates the pseudo-load for design sensitivity analysis easily by using the design variation of corresponding internal nodal forces. Errors in semi-analytical design sensitivity analysis are examined and numerical examples are illustrated to confirm the reduction of numerical error considerably.

• 한국안광학회지
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• 제12권4호
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• pp.119-125
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• 2007

본 연구는 콘택트렌즈 착용자와 안경 장용자 그리고 정시안의 대비감도를 비교하기 위해 시행되었다. 조사 대상은 만 19-26세로 근시 70안과 정시 30안을 대상으로 시행하였다, 근시안 그룹은 안경장용자 48안과 콘택트렌즈 착용자 22안으로 모두 교정시력이 1.0 이상인 안구를 대상으로 시행하였다. 공간 대비감도는 EyeView$^{(R)}$ Functional Vision Analysis software가 포함된 Optec 6500 Vision Tester$^{(R)}$ (Stereo Optical. USA)을 이용하여 Photopic (85cd)과 mesopic (3cd) 상태에서 대비 감도를 조사하여 비교하였다. 안경장용자는 정시안과 비교하여 모든 조건에서 대비감도에서 의의 있는 차이가 없었다. 소프트 콘택트렌즈 착용자는 정시안에 비해 1.5와 12cpd에서 통계적으로 낮은 대비감도를 보였다. 본 연구의 콘택트렌즈 착용자에서 대비감도가 낮게 나온 것은 콘택트렌즈 착용자의 각막 병리로 진행하기 전단계에서 나타나는 각막 문제의 증거로 해석될 수도 있다. 이러한 대비감도 검사는 소프트렌즈 콘택트렌즈 평가하는데 유용한 방법이 될 수 있는 것으로 사료된다.

• 한국농공학회논문집
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• 제57권1호
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• pp.99-109
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• 2015

In the construction industry, the interest for recycling aggregates is rising as more people demand for alternatives due to lack of supply of natural aggregates and environmental problems. However, in order for recycled aggregates to be used in infrastructures, stability and other factors need to be verified. Therefore, the objective of this study is to analyze the sensitivity of soil properties to secure slope safety according to various heights of embankment when bottom ash and dredged soil mixture is applied in the embankment. In most cases, all heights were safe for the slide for the embankment whether the water level is full or sudden draw down. The result of the sensitivity analysis revealed that the unit weight of embankments is highest among all factors to be considered. However, the sensitivity of the unit weight became smaller and the sensitivity of the friction angle of embankments increased with the height of embankments. The sensitivity of factors of core materials is very small because the core has weaker physical properties than those of the embankment. The effect of the height for each factor is different for each slope and water levels. The sensitivity of the unit weight of embankments is most affected when the height is 60m in the upstream slope. To conclude, bottom ash and dredged soil mixture can be applied in the embankment and different factors must be considered in different scale because the sensitivity depends highly on the height of embankments.

• 간호행정학회지
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• 제10권4호
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• pp.485-493
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• 2004

Purpose: This study was to identify the degree of empowerment and ethical sensitivity of staff nurses and to examine the relationship between empowerment and ethical sensitivity. Method: Data were collected from 235 staff nurses in 4 hospitals in Gyeonggi Province using a questionnaire and collected data was analyzed by the SPSS PC program. Results: The degree of empowerment was 2.76(${\pm}$ .35) out of a possible score of 4 and that of ethical sensitivity was 0.71(${\pm}$ .11) out of a possible score of 1. The relationship of between empowerment and ethical sensitivity showed statistically significant positive correlation(r=.34, p=.00). For general characteristics, there was a significant difference in empowerment according to age(F=13.18, p=.00), educational background(t=-2.09, p=.04) and clinical practice career(F=15.15, p=.00) and in ethical sensitivity according to age(F=4.01, p=.02). In characteristics related to ethics, there was a significant difference in empowerment according to experience of ethics instruction in clinical practice(t=2.25, p=.03), attitude toward the nursing profession(F=7.96, p=.00) and ethical standards(F=9.39, p=.00) and in ethical sensitivity according to attitude toward the nursing profession(F=2.94, p=.03). Conclusion: Findings suggest that a systemic and effective training program reflecting the above general and related ethics characteristics be developed to enhance empowerment and ethical sensitivity.

• Journal of Nutrition and Health
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• 제22권4호
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• pp.266-274
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• 1989

The current study was undertaken to determine the effects of the ratios of dietary fat to carbohydrate and energy restriction on insulin sensitivity in the growing rats. Male rats weighting 80-90g were fed experimental diets for two weeks. Rats were killed and epiddymal adipose tissue were removed and sliced. Explants of adipose tissues were incubated for 2 hours in KRB(Krebs-Ringer bicarbonate) buffer containing various concentrations of human insulin and [U-14C]glucose. Insulin sensitivity was determined as glucose conversion to total lipids (lipogenesis) during 2 hr incubation. Exp't I : Effects of Ratios of Fat to Carbohydrate on Insulin Sensitivity. Eighteen male rats were fed 3 diets for 2 weeks. Diet 1 was low fat-high carbohydrate (4% soybean oil and 66.5% cornstarch) ; diet 2, medium fat-medium sarbohydrate(12% soybean oil and 58.5% cornstarch) ; diet 3, high fat-low carbohydrate (20% soybean oil and 50.5% cornstarch). Insulin sensitivity was higher in the order of LF-HC, MF-HC and HF-LC diet groups (p<0.05), i.e, lipogenesis was higher at all insuline concentration in the explants from rats fed LF-HC diet. However, thers was no significant difference in body weight gain and epididymal adipose tissue weight among treatments. Exp't II ; Effects of Energy Restriction on Insulin Sensitivity. Twelve rats were grouped into ad libitum feeding and restricted feeding(70% of ad libitum). The experimental diet was medium fat-medium carbohydrat diet as used in the Exp't I. Restricted feeding group tended to show higher insulin sensitivity compared to ad libitum group. However, there was no statistical difference between two groups. As expected, body weight gain and epididymal adipose tissue were higher in the ad libitum group. In summary, the resutls of the current study showed that the epididymal adipose tissue taken from the rats fed low fat-high carbohydrate diet showed higher insulin sensitivity compared to those fed high fat-low carbohydrate, and that resticted feeding tended to elevate insulin sensitivity in these tissues.

• 디지털융복합연구
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• 제17권7호
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• pp.125-130
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• 2019

민감도 해석은 어떤 설계 변수의 변화가 전체 시스템에 미치는 영향을 확인하기 위한 방법으로, 계산된 민감도는 구조개선 시 중요한 지표가 된다. 본 연구에서는 유한요소해석을 이용하여 설계 변수에 대한 민감도 도출 및 분석 방법과, 민감도 결과를 활용한 구조개선 방법을 제안하였다. 구조 개선이 필요한 실제 반도체 검사 장비를 이용하여 경량화를 위한 설계 변수를 선정하고 설계 변수에 대한 민감도를 유한요소법과 유한차분법을 활용하여 계산하였으며, 장비가 요구하는 과도응답(Transient Response)은 유지하면서도 무게 감소가 가능한 개선 방안을 제시하였다. 유한요소해석과 유한차분법을 이용한 민감도 분석 결과를 이용한다면 구조물의 설계 개선 시 원하는 응력 또는 변위는 만족하면서도 구조적으로 향상된 설계를 할 수 있고, 이는 반도체 검사 장비뿐만 아니라 다양한 분야에서 활용이 가능하다.

• Advances in Computational Design
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• 제4권1호
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• pp.15-32
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• 2019

One of the efficient and useful tools to achieve the optimal design of structures is employing the sensitivity analysis in the finite element model. In the numerical optimization process, often the semi-analytical method is used for estimation of derivatives of the objective function with respect to design variables. Numerical methods for calculation of sensitivities are susceptible to the step size in design parameters perturbation and this is one of the great disadvantages of these methods. This article uses complex variables method to calculate the sensitivity analysis and combine it with discrete sensitivity analysis. Finally, it provides a new method to obtain the sensitivity analysis for linear structures. The use of complex variables method for sensitivity analysis has several advantages compared to other numerical methods. Implementing the finite element to calculate first derivatives of sensitivity using this method has no complexity and only requires the change in finite element meshing in the imaginary axis. This means that the real value of coordinates does not change. Second, this method has the lower dependency on the step size. In this research, the process of sensitivity analysis calculation using a finite element model based on complex variables is explained for linear problems, and some examples that have known analytical solution are solved. Results obtained by using the presented method in comparison with exact solution and also finite difference method indicate the excellent efficiency of the proposed method, and it can predict the sustainable and accurate results with the several different step sizes, despite low dependence on step size.

• Childhood Kidney Diseases
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• 제23권1호
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• pp.22-28
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• 2019

Purpose: We studied the pathogens and trends in antibiotic sensitivity pattern in children with urinary tract infection (UTI) over 8 years in order to evaluate adequate treatment. Methods: We performed a retrospective review of medical records of children with UTI from January 2009 to December 2016 in Daegu Fatima Hospital. Uropathogens and antibiotic sensitivity patterns were selected. Only 1 bacterial species with a colony count of ${\geq}105CFU/mL$ was considered a positive result. We compared 2 periods group (A: 2009~2012, B: 2013~2016) to investigate trends of antibiotic sensitivity pattern. Results: During the 8 year period, 589 cases are identified (E. coli was cultured in 509 cases, 86.4%). Among all patients, this study investigated the antibiotic sensitivity of E. coli. Antimicrobial susceptibility to ampicillin was steadily low for both periods (A: 32.6%, B: 40.1%, P=0.125), and to amikacin was consistently high for both periods (A: 99.4%, B: 99.3%, P=1.000). Antibiotic sensitivity to third-generation cephalosporin decreased from period A to B (A: 91.7%, B: 75.5%, P=0.000). Antibiotic sensitivity to quinolone significantly decreased from A to B (A: 88.4%, B: 78.2%, P=0.003). The prevalence of extended-spectrum ${\beta}$-lactamase-producing E. coli increased from period A to B (A: 6.1%, B: 17.1%, P=0.000). Conclusion: This study showed that conventional antibiotic therapy for the treatment of pediatric UTI needs to be reevaluated. A careful choice of antibiotic is required due to the change in antibiotic sensitivity and the emergence of antibiotic-resistant bacteria.

• 치위생과학회지
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• 제21권2호
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• pp.111-118
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• 2021

Background: This study was conducted to identify the level of gender sensitivity and gender equality consciousness among dental hygiene students and to confirm the necessity of gender equality programs in the curriculum. Methods: A self-report questionnaire was conducted with some dental hygiene students using the Gender Sensitivity tool and Korean Gender Egalitarianism Scale for Adolescents (KGES-A). Results: First, the gender equality consciousness of the students who took women's studies was high in the areas of educational life and socio-cultural life, and that of the subjects of grandparent families and Catholic was found to be high in the domestic life area. Second, the gender sensitivity of the subjects who took women's studies was found to be high in all sub-areas. In addition, the gender sensitivity of females was higher in the areas of sexual identity, non-violence, and self-reflection than that of males. That of 4-year college students was higher in the areas of sexual identity, openness to gender roles, and non-violence than that of 3-year college students. In addition, the gender sensitivity of Catholic students was high in the areas of sexual identity and openness to gender roles. Third, gender equality consciousness was found to have an effect depending on whether subjects took women's studies, family type, family type, and religion, and gender sensitivity was found to have an effect depending on whether subjects took women's studies or gender. Conclusion: Since dental hygienist is a profession that targets humans, education that can instill equal awareness and values of humans is important. To inspire gender sensitivity and gender equality consciousness in a prospective professional, it is necessary to conduct programs and education related to gender intelligence within dental hygiene curriculum.

• 대한통합의학회지
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• 제10권2호
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• pp.125-134
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• 2022

Purpose : Establishing multicultural acceptance is important to provide quality nursing care in various clinical settings and adapt to changing roles in different situations. The purpose of this study was to explore degree of intercultural sensitivity, cultural empathy, and multicultural acceptance, the factors influencing of multicultural acceptance of nursing students and to provide the basic data to increased multicultural acceptance. Methods : The study used a questionnaires that include general characteristics, multicultural acceptance, intercultural sensitivity, cultural empathy for nursing students. This research involved 173 nursing students in G city. The data collected from August 15, 2021 to August 30, 2021. The study was analyzed using the SPSS 23.0 program. The correlation among intercultural sensitivity, cultural empathy, and multicultural acceptance was analyzed by Pearson's correlation coefficients, and it was analyzed using multiple regression to figure out factors influencing multicultural acceptance. Results : The multicultural acceptance score was above the middle level and differed according to the academic grade (F=8.580, p<.001), major satisfaction (F=5.981, p=.003), interpersonal relations significantly (F=6.837, p=.001). Multicultural acceptance was a significant positive correlation with intercultural sensitivity (r=.544, p<.001), cultural empathy (r=.624, p<.001). As a result of regression analysis, it was confirmed that cultural empathy (β=.477, p<.001) and intercultural sensitivity (β=.212, p<.001) were factors that influence nursing students' multicultural acceptance ; this model could explain 40 %. Conclusion : Factors affecting multicultural acceptance of nursing students are cultural empathy and intercultural sensitivity. Nursing students are encouraged to have multicultural acceptance in terms of satisfaction of cultural empathy and intercultural sensitivity. Through this research requires the fellow study to determine the various factors affecting multicultural acceptance of nursing students. And it is necessary to development education and program that can enhance multicultural acceptance is required.