• 소음진동
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• 제7권2호
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• pp.331-345
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• 1997

A theoretical formulation for the analysis of free vibration of clamped-free cylindrical shells with plates attached at arbitrary axial position(s) was completed and it was programed to get the numerical results which yield natural frequencies and mode shape of the combined system of the plate and the shells. The frequencies and mode shapes from theoretical calculation were compared with those of commercial finite element code, ANSYS. In order to validate the theory, modal test was also performed by impact test and FFT analysis. The results shows good agreement with those of ANSYS and test results in frequencies and mode shapes. The method developed herein is likely to be used for the analysis of the free vibration of the clamped-free circular cylindrical shells with any kinds of lids such as hollow circular plates, conical shells, spherical shells, or semi-spherical shells.

• 환경영향평가
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• 제3권2호
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• pp.57-67
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• 1994

The National Park should be preserved as described in the regulation. However, the development has resulted in degrading the environment in the park. Especially, the collective facility area has been developed for the commercial benefit rather than for the preservation. So, it is necessary to figure out the impact of the development plan proposed. Thus, the purpose of this study is to explore the hydrologic effects due to the collective facility area development in the National Park. The study site is the second collective facility area of Mt. Kyeryong National Park. The analysis of hydrologic effects due to the development has been carried out using the GIS in this study. The Rational Method and Soil Conservation Service(SCS) were used to estimate the runoff volume. During this procedure, GIS software, ARC/INFO was used to integrate, manipulate, and calculate the attribute value of a number of ploygons which represen each land use characteristic. A program was written to compute the attribute value of each polygon and to estimate the difference of peaktime runoff volume before and after development.

• 가정과삶의질연구
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• 제26권6호
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• pp.193-207
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• 2008

This study analyzed the impact of the well-being trends and the attributes of the choice of the walnut-cookie on the consumer's purchasing intention. The results of this study would enhance newly revised product so that brand and product marketing strategy would be strengthened. This study also would contribute for the consumer related management through systematic and exploring research regarding consumers' expectation of products' values and trends. Specific results are as followings. Well-being oriented trends had various meanings such as "Commercial Well-being", "Eco-friendly Well-being", "Physical Well-being", and " Favors for leisure". Consumer's attributes of choice for the walnut-cookie were "Branding", "The Value of Traditional Food", "Environmental Position", and "The Function of Products". And the "Popularity", "Nutrition". and the "Service" were most preferred factors to be chosen. The multiple regression analysis was tried to test the impact of demographics, well-being trend, and the attributes of choice for walnut-cookie influence on the consumer's purchasing intention. The statistically significant factors were age, job, and leisure oriented consumer style of consumer's characteristics as well as corporation's brand strategy on a basis of marketing aspects. The younger groups, leisure pursing groups, and student groups showed the higher level of purchasing intention for the walnut-cookie compared to other groups.

• The Journal of Asian Finance, Economics and Business
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• 제8권1호
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• pp.939-950
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• 2021

The purpose of this research is to investigate the factors affecting Thai commercial bank users' behavioral intention towards QR code payment system via mobile banking applications. The researchers conducted the study based on quantitative research approach. Non-probability sampling method such as the quota and convenience sampling was applied as sampling technique. A self-administered questionnaire was distributed. The data was collected from 1,800 respondents living in Bangkok, who have had an experience with QR code payment system with the top-three mobile banking applications in Thailand. This study concentrates on confirmatory factor analysis and structural equation modeling as a statistical tool to examine the data, model accuracy, and influence of critical variables. In addition, the researchers applied the first-order and second-order techniques to examine the relationship between constructs. Adoption readiness and perceived risk were second-order constructs. The results reveled that compatibility has an impact on attitude towards QR code payment. Moreover, adoption readiness, compatibility, attitude, and personal innovativeness are statistically significant that impact behavioral intention towards QR code payment. The strongest antecedents of behavioral intention were compatibility, attitude, adoption readiness, and personal innovativeness, respectively. Surprisingly, perceived risk and perceived trust do not statistically have a significant impact on behavioral intention towards QR code payment.

• The Journal of Asian Finance, Economics and Business
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• 제9권6호
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• pp.45-52
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• 2022

This research has the purposes of analyzing and proving empirically, such as: To investigate the effect of good corporate governance (GCG) on financial performance at banks in Indonesia through the mediating role of corporate asset growth. Theoretically, the study's results were expected to enrich and complete the repertoire of understanding in the financial management area, specifically with those phenomena related to banking financial performance and factors which influenced it. The population of this research was a bank that had a Corporate Governance Perception Index (CGPI) rating from 2011 to 2020. The type of sampling used was saturated sampling; thus, the whole population is sample members. Current data analysis used SEM. GCG has a direct or indirect impact on banking financial performance, according to the findings of this study. Improved GCG results in increased public confidence, which is reflected in an increase in total assets, as well as improved banks' financial performance. As a result, it can be stated that corporate asset increase largely mitigated the impact of GCG on bank financial performance in Indonesia. Through this rapid growth from corporate assets, Bank can maximize the market expansion which is ultimately able to improve banking financial performance.

• 한국산학기술학회논문지
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• 제12권6호
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• pp.2463-2469
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• 2011

이동전화기의 낙하 충격 시 디스플레이 모듈의 파손은 이동전화기의 재료, 강성 및 형상에 의하여 많은 영향을 받는다. 이동전화기 개발의 초기 단계에서는, 디스플레이 모듈의 내구성을 판단하기 위하여 모듈을 지그에 장착하여 낙하시험을 수행한다. 본 연구에서는 OLED 모듈의 충격 시험을 수행하기 위한 지그를 개발하였다. 지그의 재료, 두께 및 리브의 개수와 방향 등을 설계변수로 고려하여 실제 이동전화기가 낙하할 때 OLED 모듈이 받는 충격 응력과 가장 유사한 응력이 발생하도록 지그를 개발하였다. ABAQUS/Explicit를 사용한 1.5m 높이 충격 해석에서, 개발된 지그에 장착된 OLED 모듈의 유리에서 발생하는 최대주응력은 이동전화기에 장착된 동일 모듈의 유리에서 발생하는 최대주응력과 유사함을 확인할 수 있었다.

• 한국철도학회논문집
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• 제12권1호
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• pp.115-121
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• 2009

자기부상열차는 전자기력으로 차량을 부상, 추진하는 시스템으로써 친환경적이고 주행성능이 우수해 장래의 대중교통수단으로 각광받고 있다. 국내에서도 1989년 이후 자기부상열차와 그 시설물에 대한 연구가 진행되고 있으며 2012년 인천에 도시형 자기부상열차가 실용화될 예정이다. 도시형자기부상열차가 실용화되기 위해서는 자기부상 전용 가이드웨이의 성능이 확보되어야한다. 또한 자기부상열차는 나라마다 차량형식이 달라 국내 실정에 맞는 적절한 설계기준이 필요하다. 본 연구에서는 도시형자기부상 실용화 사업에서 제안된 자기부상 가이드웨이를 대상으로 유한요소해석을 수행하여 도시형 자기부상 가이드웨이의 단면성능을 평가하고 충격계수를 산출하였다. 해석수행 결과 동적증폭효과는 크지 않은 것으로 나타났으며 이를 통해 향후 자기부상 전용 가이드웨이 충격계수 설계기준 정립에 필요한 자료가 될 것이라고 기대된다.

• Structural Engineering and Mechanics
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• 제43권2호
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• pp.199-209
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• 2012

Two carbon fiber composite laminates, $[0/90]_{2S}$ and $[0/+45/90/-45]_S$, were considered in this work to find out the perforation threshold energy to complete the perforation process and the corresponding maximum contact force. Explicit finite element commercial software, LS-DYNA, was used to predict these values. According to the simulation results, these two types of composite laminates were tested by using a vertical drop-weight testing machine. After testing, the damage condition of these specimens were observed and compared with the results from finite element analysis. The testing results indicate that the perforation threshold energy is 6 Joules for $[0/90]_{2S}$ and 7 Joules for $[0/+45/90/-45]_S$, which is in good agreement with the simulation results. Also, the maximum contact force at the case of perforation threshold energy is the lowest as compared to the maximum contact forces occurring at the impact energy that is larger or less than the perforation threshold energy.

• 대한조선학회논문집
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• 제44권3호
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• pp.305-313
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• 2007

The aim of present paper is to investigate the dynamic strength characteristics of LNG cargo containment system under sloshing impact loads numerically. The dynamic stress transmission mechanism under the impact load was analyzed based on the dynamic Finite Element Analysis. Based on the insights obtained from the numerical studies, the characteristics of internal stress distribution and stress concentration have been reported. The material option including anisotropic material features required for the commercial FEA code application were suggested based on the comparison with the experimental results.

• 한국해양공학회지
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• 제33권5호
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• pp.411-420
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• 2019

It is essential to design crashworthy marine structures for operations in Arctic regions, especially ice-covered waters, where the structures must have sufficient capacity to resist iceberg impact. In this study, a numerical analysis of a colliding accident between an iceberg and stiffened plates was carried out employing the commercial finite element code ABAQUS/Explicit. The ice material model developed by Liu et al. (2011) was implemented in the simulations, and its availability was verified by performing some numerical simulations. The influence of the ambient temperature on the structural resistance was evaluated while the local stress, plastic strain, and strain energy density in the structure members were addressed. The present study revealed the risk of fracture in terms of steel embrittlement induced by ambient temperature. As a result, the need to consider the possibility of brittle failure in a plate-stiffener junction during operations in Arctic regions is acknowledged. Further experimental work to understand the structural behavior in a plate-stiffener junction and HAZ is required.