• Advances in nano research
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• 제15권5호
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• pp.401-410
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• 2023

Vibration investigation of fluid-filled three layered cylindrical shells is studied here. A cylindrical shell is immersed in a fluid which is a non-viscous one. Shell motion equations are framed first order shell theory due to Love. These equations are partial differential equations which are usually solved by approximate technique. Robust and efficient techniques are favored to get precise results. Employment of the wave propagation approach procedure gives birth to the shell frequency equation. Use of acoustic wave equation is done to incorporate the sound pressure produced in a fluid. Hankel's functions of second kind designate the fluid influence. Mathematically the integral form of the Lagrange energy functional is converted into a set of three partial differential equations. It is also exhibited that the effect of frequencies is investigated by varying the different layers with constituent material. The coupled frequencies changes with these layers according to the material formation of fluid-filled FG-CSs. Throughout the computation, it is observed that the frequency behavior for the boundary conditions follow as; clamped-clamped (C-C), simply supported-simply supported (SS-SS) frequency curves are higher than that of clamped-simply (C-S) curves. Expressions for modal displacement functions, the three unknown functions are supposed in such way that the axial, circumferential and time variables are separated by the product method. Computer software MATLAB codes are used to solve the frequency equation for extracting vibrations of fluid-filled.

• 한국콘텐츠학회논문지
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• 제11권8호
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• pp.187-197
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• 2011

연구는 기존 연구들이 단일한 개념으로 인식하고 있던 혁신성향 개념을 인지적 혁신성향과 감각적 혁신성향으로 구분하고 두 유형의 혁신 성향의 정도에 따라 신제품에 대한 소비자의 지각된 위험의 민감성이 다름을 보였다. 이러한 지각된 위험의 유형과 수준의 차이는 각각의 혁신 성향이 소비자의 신제품 구매의도에 있어 서로 다른 영향력이 있음을 보여 줌으로써 혁신성향이 소비자의 신제품 구매의도에 미치는 경로가 이중경로임을 제시하였다. 217명을 대상으로 회귀분석과 공변량 구조 분석을 통하여 실증 분석을 수행한 결과 감각적 혁신성향 보다 인지적 혁신성향이 높을수록 사회적 위험보다 기능적 위험을 더 많이 지각하는 반면 감각적 혁신성향이 높을수록 기능적 위험보다는 사회적 위험을 더 지각하는 것으로 나타났다. 즉, 신제품 구매에 따른 기능적 위험 지각과 사회적 위험 지각이 소비자의 혁신성향의 유형에 따라 다르게 나타남을 제시하였다. 기존 연구에서는 소비자의 혁신성향 개념을 하나의 구성 개념으로 파악하여 신제품 구매의도에 대한 영향 관계를 파악하였으나 본 연구는 감각적 혁신성향과 인지적 혁신성향으로 소비자의 혁신성향을 구분하고 신제품 구매의도와의 관계를 파악하였으며 각각의 혁신성향이 신제품에 대해 인지하는 지각 위험의 경로를 달리함을 밝혔다.

• 경영과정보연구
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• 제29권1호
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• pp.117-144
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• 2010

본 연구는 소비자 관계에 영향을 미치는 선행 변수로 기능적 편익, 정서적 편익, 자아표현적 편익이 어떠한 영향력을 행사하며, 이러한 소비자-브랜드 관계가 브랜드 애착과 구전에 어떠한 구조적 관계를 나타내는지를 실증적으로 검증하여 살펴보고자 하였다. 이를 위해 구조방정식 모형(Structural Equation Model) 중에서 두 경로 간 크기를 통계적으로 검증할 수 있는 위계적 카이스퀘어 분석(hierarchical chi-squal analysis)을 통해 가설을 검증하였다. 연구 결과 기능적 편익보다는 정서적 편익이 소비자-브랜드 관계 형성에 미치는 영향력이 우세하였다. 또한 소비자-브랜드 관계 형성에 있어 정서적 편익과 자아표현적 편익은 영향력 차이는 나타나지 않았다. 즉, 정서적 편익과 기능적 편익 모두 소비자-브랜드 관계 형성에 긍정적인 영향을 미치는 것으로 나타났다. 반면, 기능적 편익보다는 자아표현적 편익이 소비자-브랜드 관계 형성에 우세한 역할을 행사하는 것으로 나타났다. 소비자-브랜드 관계 형성정도가 높을수록 브랜드 애착과 구전에 긍정적인 영향을 미치는 것으로 나타났다. 이들 결과를 통해 보면 소비자-브랜드 관계 형성을 위해서는 기능적 편익보다는 정서적 편익과 자아표현적 편익을 통해 브랜드 전략을 수립하는 것이 바람직하다. 또한 이러한 가치 편익을 통해 형성된 소비자-브랜드 관계는 브랜드에 대한 사랑과 같은 애착 정도가 깊어질 뿐 아니라 자발적인 구전을 통해 긍정적이고 장기적인 커뮤니케이션 효과를 달성할 수 있을 것으로 기대된다.

• 한국작물학회지
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• 제35권2호
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• pp.156-164
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• 1990

A field experiment was conducted to study both the distribution characteristics of photosynthetically active radiation (PAR) in the soybean canopy and their relationships with dry matter production. The soybean cultivars 'Hwanggeumkong' and 'Paldalkong' were sown with the spaces of 60$\times$15cm and 30$\times$15cm at Suwon on May 20 and on June 20 in 1989. The ratio of PAR to the total shortwave radiation was estimated by the empirical equation derived from sunshine hours and direct incoming radiation. The functional relationships between the PAR interception and the leaf area index were expressed as a function of Beer's law. The extinction coefficients(k) in the functions ranged from 0.77 to 0.92. The values of k were greater at higher planting density, but they were affected neither by planting dates nor by varieties. The reflection ratio of PAR($\alpha$) was determined by the exponential function as below; $\alpha$=$\alpha$p-($\alpha$p-$\alpha$o) exp(-kㆍLAI) where $\alpha$p was the reflectance at the maximum LAI and $\alpha$o was that of the bare soil. The ap ranged from 0.025 to 0.035 and $\alpha$o ranged from 0.11 to 0.12, respectively. The reflected PAR ranged from 0.049 to 0.064 and the transmitted PAR ranged from 0.168 to 0.340 until maximum dry weights were observed. The slope from the linear regression of dry matter on absorbed PAR, conversion efficiency, ranged from 1.30 to 2.3g MJ$^{-1}$ during the growing season until maximum dry weight was reached. The total dry matter yield above ground (TDM) increased with the increases in the conversion efficiency. TDM was higher in Hwanggeumkong than Paldalkong and higher in the space of 30$\times$15cm than 60$\times$15cm, Paldalkong showed higher harvest index than Hwanggeumkong. than Hwanggeumkong.

• Structural Engineering and Mechanics
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• 제28권2호
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• pp.129-152
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• 2008

This paper considers the solution of the stochastic differential equations (SDEs) with random operator and/or random excitation using the spectral SFEM. The random system parameters (involved in the operator) and the random excitations are modeled as second order stochastic processes defined only by their means and covariance functions. All random fields dealt with in this paper are continuous and do not have known explicit forms dependent on the spatial dimension. This fact makes the usage of the finite element (FE) analysis be difficult. Relying on the spectral properties of the covariance function, the Karhunen-Loeve expansion is used to represent these processes to overcome this difficulty. Then, a spectral approximation for the stochastic response (solution) of the SDE is obtained based on the implementation of the concept of generalized inverse defined by the Neumann expansion. This leads to an explicit expression for the solution process as a multivariate polynomial functional of a set of uncorrelated random variables that enables us to compute the statistical moments of the solution vector. To check the validity of this method, two applications are introduced which are, randomly loaded simply supported reinforced concrete beam and reinforced concrete cantilever beam with random bending rigidity. Finally, a more general application, randomly loaded simply supported reinforced concrete beam with random bending rigidity, is presented to illustrate the method.

• Clinics in Shoulder and Elbow
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• 제25권4호
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• pp.274-281
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• 2022

Background: In the present study, the age- and sex-adjusted Constant score (CS) in a normal Indian population was calculated and any differences with other population cohorts assessed. Methods: The study participants were patients who visited the outpatient department for problems other than shoulder and healthy volunteers from the local population. Patients without shoulder pain/discomfort during activity were included in the study. Subjects with any problem that might affect shoulder function (e.g., cervical, thoracic spine, rib cage deformity, inflammatory arthritis) were excluded. Constant scoring of all participants was performed by trained senior residents under the supervision of the senior faculty. Shoulder range of movement and strength were measured following recommendations given by the research and Development Committee of the European Society for Shoulder and Elbow Surgery (2008). A fixed spring balance was used for strength measurement; one end was fixed on the floor and the other end tied with a strap to the wrist of the participant, arm in 90° abduction in scapular plane with palm facing down. Results: Among the 248 subjects (496 shoulders), the average age was 37 years (range, 18-78 years), 65.7% were males (326 shoulders) and 34.3% females (170 shoulders). The mean CS was 84.6±2.9 (males, 86.1±3.0; females, 81.8±2.9). CS decreased significantly after 50 years of age in males and 40 years of age in females (p<0.05). The mean CS was lower than in previous studies for both males and females. Heavy occupation workers had higher mean CS (p<0.05). A linear standardized equation was estimated for calculating the adjusted CS for any age. Conclusions: Mean CS and its change with age differed from previous studies among various population cohorts.

• 한국의류학회지
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• 제30권6호
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• pp.870-879
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• 2006

In this study, the difference in the mechanical properties of silver and cotton weft knitted fabrics was studied. Six silver fabrics for the summer ladies' knit outwear were knitted varying knit structure and fabric density. Two commercial cotton knitted fabrics were selected to compare the properties. subjective sensation of hand of the fabrics was also studied. Mechanical properties of the fabric samples were measured by KES-FB system. From these, primary hand values(HV) were evaluated by the conversion equation (KW-403-KTU) and the total hand value(THV) was carried out according to the KW-304 Summer. The result of the research show that silver weft knitted fabrics had lower LT, RT, G, 2HG and higher EM, W, LC, WC, RC than cotton weft knitted fabrics. The use of silver yam contributed to increase in surface roughness of knitted fabrics. As the silver knitted fabrics became thicker compressional energy increased. The use of silver yarns contributed to much better fabric handle compared with the use of cotton yam only. It appeared that coefficient of friction of tuck stitch was larger than that of plain and interlock stitch. KOSHI and FUKURAMI values of the tuck samples were significantly higher than those values of the plain and interlock samples, while SHARI values were low in general. The total hand value of tuck stitch was higher than those of interlock and plain stitch.

• 한국조경학회지
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• 제34권5호
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• pp.39-51
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• 2006

This study was carried out to provide guidance to environmental policy makers when deciding which assessment fields (biotic, abiotic, qualitative, functional) should have priority for ecological preservation and to develop an objective and scientific methodology by introducing the engineering concept of the fuzzy integral. The grant of weights was used the eigenvalues calculated by factor analysis, and the converted values of indicators were obtained in multiplying the arithmetic values and eigenvalues. The results of the appropriateness and reliability of assessment fields were examined over 0.6, and the results showed that the design of questionnaire presented no great problems. When the fuzzy integral was calculated to determine the rankings at ${\lambda}$=1, 2, 3, 4, 5, respectively, they were 0.646, 0.630, 0.943, 1.423, and 1.167 for the biotic field, 1.298, 1.400, 0.901, 0.580, and 1.456 for the abiotic field, 0.714, 0.674, 0.346, 0.674, and 1.610 in the qualitative field and 1.000, 0.973, 0.943, 1.024, and 1.008 in the functional field. The sensitivity to ${\lambda}$ value showed that ${\lambda}=4$ was the most suitable. In comparison with ${\lambda}=0$ (the arithmetic mean), the range of change was narrow. Because the range for ${\lambda}=4$ was narrower than my other values, ${\lambda}=4$ was sure to be available in ranking-decision. The fuzzy integral is expected to be a method for analyzing and filtering human thoughts. In the future, in order to overcome linguistic uncertainty and subjectivity, other fuzzy integral models including Sugeno's method, AHP, and so forth should be used.

• 한국병원경영학회지
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• 제24권1호
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• pp.36-47
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• 2019

Purposes : The purpose of this study is to analyze empirically the consturct development of brand trust in dental clinic service and its influence on both satisfaction and brand loyalty of clinic users in Seoul area. Methodology : To test the hypotheses, the structured instrument was employed to question to patients and their guardians who had used dental clinics in the metropolitan area. 207 cases were analyzed with structural equation method through SPSS 18.0 and AMOS 22.0, and findings of the test as follows. Findings : Firstly, both functional and associative images had a positive impact on the brand trust. Especially we found the influence of functional images was greater than that of the brands' associative images. Secondly, the satisfaction of dental clinic users had greater positive influence on the clinics with greater trust. Thirdly, the higher the satisfaction of health service consumers, the more positive effect on brand loyalty. This relationship between the satisfaction of dental clinic users and brand loyalty match the findings of previous studies on relations of similar variables. Practical Implications : This study shows that with greater satisfaction, the referral rate and the revisit rate of users would increase. This implies that dental clinics need to take appropriate actions to build brand trust with advertising and/or PR strategies for a good brand image. It would be necessary to research further expected variables that influence users' brand loyalty in the service, such as the dentists' level of expertise, their relationship level with customers, the quality of dental services and et al..

• 한국의류산업학회지
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• 제22권6호
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• pp.752-761
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• 2020

This study analyzes the type of preferred shopping items based on tourism shopping value pursued by tourists through shopping at travel destinations as well as verifies their impact on satisfaction. A survey on 310 adult men and women aged 20 to 69 collected data samples representing tourism shoppers in Korea. Based on the collected data, a factor analysis and a structural model equation analysis were performed using SPSS 25.0 and AMOS. Tourism shopping value was divided into functional value, emotional value, exploratory value, and shared value. In addition, shopping items were categorized as physical materials and experience materials to identify the difference in preferred item types according to the value that tourists perceive. It also confirmed the adjustment effect of tourism motivation that affects tourism shopping behavior. According to the analysis results, the more tourists perceive functional and emotional values when shopping, the more physical material they prefer, and the more they perceive exploratory values, the higher the preference for experience goods. However, the shared value affected both physical materials and experience materials. Based on escape-seeking motivation, the adjustment effect of tourism motivation (a major variable to understand the behavior of tourists) on tourism shopping behavior was confirmed. Based on the academic and practical implications of this study, we hope to broaden our understanding of tourism shopping and revitalize research on tourism shopping.