• Title/Summary/Keyword: higher order elements

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Analysis of Levels of Risk Perception using Psychometric Paradigm and Factors Affecting Concerns about Food Risk Elements of Housewives in Daegu (심리측정 패러다임을 이용한 대구 지역 주부들의 식품 위해요소에 대한 위험 지각 수준 및 우려도에 영향을 미치는 요인 분석)

  • Kim, Hyochung;Han, Jin-Young;Kim, Meera
    • Journal of the East Asian Society of Dietary Life
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    • v.25 no.4
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    • pp.691-702
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    • 2015
  • This study examined the levels of risk perception of food risk elements by adopting a psychometric paradigm and analyzed factors affecting concerns about food risk elements to obtain basic materials for food safety policy. The data were collected from 296 housewives in Daegu, Korea, by a self-administered questionnaire. Frequency distributions, Pearson's correlation coefficient analysis, factor analysis, Cronbach's ${alpha}$, and multiple regression analyses were conducted by SPSS 21.0. The mean level of concern for food safety was 3.75/5.00 points, and the mean percentage of correct answers about heavy metal contamination was highest among food risk elements. The respondents perceived radioactive contaminated foods, GM foods, and endocrine disruptors as a new, delayed, scientifically unknown, involuntary, serious, and uncontrollable risk in risk perception. According to the result of factor analysis for risk perception, two factors such as non-controllability and dread were categorized. In the risk perception map, radioactive contaminated foods and GM foods were considered as an uncontrollable and dreaded risk, heavy metal contamination, endocrine disruptors, and pesticide residues as a controllable and dreaded risk, and foodborne illness and food additives as a controllable and less dreaded risk. On the other hand, the levels of concerns about food risk elements were higher in order of radioactive contaminated foods, GM foods, and endocrine disruptors. The results of multiple regression analysis showed that age, concern for food safety, percentage of correct answers about food risk elements, non-controllability, and dread influenced the concerns about food risk elements. These results imply that food safety policies should consider differences in consumer's risk perception of food risk elements.

Heavy metal concentration of plants in Baekdong serpentine area, western part of chungnam (충남 서부 백동 사문암지역 식물체의 중금속 함량)

  • 송석환;김명희;민일식;장인수
    • Journal of Korea Soil Environment Society
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    • v.4 no.2
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    • pp.113-125
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    • 1999
  • Heavy metal elements were analysed to assess degrees of heavy metal contents for the plants, M. sinensis, A. vulgaris and G. oldhamiana, from the Baekdong serpentine area within the western part of Chungnam. The area was divided into two sites ; serpentine area (SP, consisting of serpentinite, SP) and non-serpentine area (NSP, containing amphibole schist, AS and gneiss, GN). Their host rocks(R) and top soils(S) were also collected from the each site. As the results of the study, the plants contain high concentration of Ni Cr, Co in the SP and Fe, Zn in the AS and GN. Plants from the AS of the NSP contain mainly high content in the most of elements. Averages of Ni, Co and Cr for the plants decreased in the order of SP, AS and GN. In the total element contents, M. sinensis and A. vulgaris decreased in the order of Fe > Ni or Cr > Zn > Co > As > Sc within the SP and in the order of Fe > Zn > Cr > Ni, within the GN. Comparing among the parts of plants, root parts were higher in the most of elements than the above grounds. In the relative element ratios of plants collected from the SP and GN (SP/GN) M. sinensis was lower than A. vulgaris in the most of elements, suggesting that the M. sinenis shows low absorption within the infertile serpentine soil and high absorption within the fertile gneiss soil. In the element contents of the top soils and their host rocks, the SP shows higher Ni, Co and Cr contents than the others. Their total contents decreased from SP to AS and GN, suggesting that the soils reflect the composition of their host rocks. Total element contents of the SP decreased in the order of Fe> Cr or Ni> Co> Zn> As> Sc and, for the GN, in the order of Fe> Zn> Cr> Ni> Co or Sc, respectively. In the relative element ratios, R/S of the SP decreased in the order of Cr> As> Fe> Sc> Co> Ni> Zn and for the GN, in the order of Sc> Fe> Ni> Zn> Cr> Co. Comparing with plants within the each site, their top soils were higher than the plants in the most of elements. and their increase and decrease trends for each element are similar. Differences of element contents between the top soils and plants decreased in the order of SP, AS and GN. Plants of the GN were moi-e similar to their soils than those of the others, suggesting that each plant species show different absorptions within the different soils. Comparing with the plants of GN, higher Ni, Co, Cr contents within those of the SP and their survival within the infertile serpentine soil suggest that the M. sinensis, A vulgaris and G. oldhamiana may be the tolerance species in the serpentine soil. Comparisons with the upper crust show that M. sinensis, and A. vulgaris within the SP show high Hi and Cr contents. suggestive of hyperaccumulation. Upper results with the previous studies for the contaminated soils developed as parent materials with the serpentinites suggest additional studies for ecological behaviors for the plant and degrees of accumulations for the elements need to know phytoextraction of the heavy metal elements within the soils.

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Study on the Variation Characteristic of the Photo-Volatic Power Generation due to Regional Meteorological Elements (국지 기상 요소에 의한 태양광 발전량 변동특성에 관한 연구)

  • Lee, Soon-Hwan;Kim, Hae-Dong;Cho, Chang-Bum
    • Journal of Environmental Science International
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    • v.23 no.11
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    • pp.1943-1951
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    • 2014
  • In order to clarify the characteristics of Photo-Volatic(PV) power generation over the Korean peninsula with complex terrain, special meteorological observation campaign was carried out for one year from 25 May 2011. Analysis is based on the comparison between observed meteorological elements and PV values generated at rated capacity 200 kW power plants. Solar radiation observed at $15^{\circ}$ inclined surface is 11 % larger than that observed at horizontal surface due to low elevation angel of the sun during winter season. The PV power generation tend to be more similar the variation of inclined surface irradiance than horizontal surface irradiance. Increasing air temperature often induce disturbance of the PV power generation. However, the higher the air temperature in winter season, the higher PV power generation because the PV module may be more activated at higher air temperature. PV generating efficiency tends to be conversed the value of 15%.

Study on Application of Isogeometric Analysis Method for the Dynamic Behavior Using a Reduced Order Modeling (축소 모델의 동적 거동 해석을 위한 등기하해석법 적용에 대한 연구)

  • Kim, Min-Geun;Kim, Soo Min;Lee, Geun-Ho;Lee, Hanmin
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.31 no.5
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    • pp.275-282
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    • 2018
  • Using isogeometric analysis(IGA) gives more accurate results for higher order mode in eigenvalue problem than using the finite element method(FEM). This is because the FEM has $C^0$ continuity between elements, whereas IGA guarantee $C^{P-1}$ between elements for p-th order basis functions. In this paper, a mode based reduced model is constructed by using IGA and dynamic behavior analysis is performed using this advantage. Craig-Bampton(CB) method is applied to construct the reduced model. Several numerical examples were performed to compare the eigenvalue analysis results for various order of element basis function by applying the IGA and FEM to simple rod analysis. We have confirmed that numerical error increases in the higher order mode as the continuity between elements decreases in the IGA by allowing internal knots multiplicity. The accuracy of the solution can be improved by using the IGA with high inter-element continuity when high-frequency external force acts on the reduced model for dynamic behavior analysis.

Evaluation of the seismic performance of off-centre bracing system with ductile element in steel frames

  • Bazzaz, Mohammad;Kheyroddin, Ali;Kafi, Mohammad Ali;Andalib, Zahra
    • Steel and Composite Structures
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    • v.12 no.5
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    • pp.445-464
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    • 2012
  • In order to evaluate the dynamic behavior of passive energy dissipation system, two steps need to be considered for prediction of structural response in the presence of ductile element in an off-centre bracing system. The first is a detailed analysis of the proposed ductile element and the second is the effect of this ductile element on an off-centre bracing system. The use of ductile bracing system is expanding in steel structures in order to increase the force reduction factor. Therefore, regarding the nonlinear behavior of steel material used in an off-centre bracing systems and using ductile element in OBS bracing systems, the seismic evaluation of the mentioned systems seems to be necessary. This paper aims to study linear and nonlinear behavior of steel frames with off-centre bracing system and ductile element, in order to get the best position of these bracing elements. To achieve this purpose, the modeling has been done with ANSYS software. The optimum eccentricity has been obtained by modeling three steel frames with different eccentricities and evaluating the results of them. The analytical results showed that the model OBS-C with 0.3 eccentricities has higher performance among the models.

A Compact LTCC Dual-Band WLAN Filter using Two Notch Resonators

  • Park, Jun-Hwan;Cheon, Seong-Jong;Park, Jae-Yeong
    • Journal of Electrical Engineering and Technology
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    • v.8 no.1
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    • pp.168-175
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    • 2013
  • This paper presents compact dual-band WLAN filter and filter module. They were developed by embedding all of the passive lumped elements into a LTCC substrate. In order to reduce the size/volume of the filter and avoid EM parasitic couplings between the passive elements, the proposed filter was designed using a 3rd order Chebyshev circuit topology and J-inverter transformation technology. The 3rd order Chebyshev bandpass filter was firstly designed for the band-selection of the 802.11b and was then transformed using finite transmission zeros technologies. Finally, the dual-band filter was realized by adding two notch resonators to the 802.11b filter circuit for the band-selection of the 802.11a/g. The maximum insertion losses in the lower and higher passbands were better than 2.0 and 1.3 dB with minimum return losses of 15 and 14 dB, respectively. Furthermore, the filter was integrated with a diplexer to clearly split the signals between 2 and 5 GHz. The maximum insertion and minimum return losses of the fabricated module were 2.2 and 14 dB at 2.4 - 2.5 GHz, and 1.6 and 19 dB at 5.15 - 5.85 GHz, respectively. The overall volume of the fabricated filter was $2.7{\times}2.3{\times}0.59mm^3$.

A Analytical Study on the Architectural Trends of Larry Bell's Work by Lacan's Gaze (라깡의 응시에 의한 래리 벨의 작품 속 건축적 경향 분석연구)

  • Lee, Jae-In
    • Journal of the Architectural Institute of Korea Planning & Design
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    • v.35 no.12
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    • pp.93-104
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    • 2019
  • This study set out to analyze the architectural trends in Bell's works and spaces by applying the Gaze theory of Jacques Lacan to his minimalism works, concept changes in their changing process, and the development of exhibition spaces related to him. The findings were as follows: first, his early glass cube works sought after the reproduction of the Real Order through the repeating eyes of viewers and objects by using exhibition lighting; second, his works in the Standing Wall category pursued the reproduction of the Real Order through the repeating eyes of many different viewers around objects; third, his Nesting Boxes tried to reproduce the Real Order of a higher competition level in the perception aspects, making the repetitive elements of Standing Walls converge and including even external environmental elements; fourth, there is no decisive gaze sought after by Judd or the Key Signifiant as the core of Lacan's philosophy in Bell's formative works; and finally, Bell's works pursue the completion of Simulacrum through the infinite repetition of Derrida's Deconstruction Philosophy through the infinite visual repetition sought after by Gehry and Moss in the LA School of Architects who shared the same area and period with him.

Evaluation of vibroacoustic responses of laminated composite sandwich structure using higher-order finite-boundary element model

  • Sharma, Nitin;Mahapatra, Trupti R.;Panda, Subrata K.;Mehar, Kulmani
    • Steel and Composite Structures
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    • v.28 no.5
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    • pp.629-639
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    • 2018
  • In this paper, the vibroacoustic responses of baffled laminated composite sandwich flat panel structure under the influence of harmonic excitation are studied numerically using a novel higher-order coupled finite-boundary element model. A numerical scheme for the vibrating plate has been developed in the frame work of the higher-order mid-plane kinematics and the eigen frequencies are obtained by employing suitable finite element steps. The acoustic responses are then computed by solving the Helmholtz wave equation using boundary element method coupled with the structural finite elements. The proposed scheme has been implemented via an own MATLAB base code to compute the desired responses. The validity of the present model is established from the conformance of the current natural frequencies and the radiated sound power with the available benchmark solutions. The model is further utilized to scrutinize the influence of core-to-face thickness ratio, modular ratio, lamination scheme and the support condition on the sound radiation characteristics of the vibrating sandwich flats panel. It can be concluded that the present scheme is not only accurate but also efficient and simple in providing solutions of the coupled vibroacoustic response of laminated composite sandwich plates.

Contents Analysis on Unification Education in the Teachers' Manual of the Nuri Curriculum (누리과정 교사용 지도서에 나타난 통일교육 내용분석)

  • Choi, Yoonkyung;Yun, Eunju
    • Korean Journal of Childcare and Education
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    • v.13 no.2
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    • pp.115-131
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    • 2017
  • Objective: This study aimed to examine the status of South Korean unification education for young children by reviewing Nuri curriculum developed by the Korean government. Method: Literature review was adopted in order to analyze the contents of the Nuri curriculum teachers'manuals under the areas and elements of unification education. Results: Unification education has been designed to accelerate unification, to promote the values and attitudes toward the unification of the two Koreas, and to prepare for the post-unification period. This education can be categorized into specific areas: democratic community, democratic citizenship, peacekeeping and multiculturalism. These areas account for 24.24% of the total contents in the Teachers'Manual of the Nuri curriculum. The percentage of the contents helpful to understand North Korea and unification, however, is merely 0.25% of the total contents, and the elements are not fairly balanced. Such content coverage of the teacher's manuals for kindergartens is 2.83% higher than that for preschools. Conclusion/Implications: The implications of this analysis include that the elements of unification education should take a more balanced approach with more integrated and broader coverage. The elements also need to be revised so that both kindergarteners and preschoolers can get access to unification education of the same quality.

Evaluation of Typical Solar Radiation Data by the TRY Methodology (TRY 방법론에 의한 표준일사량데이터 평가)

  • Yoo, Ho-Chun;Lee, Gwan-Ho;Kim, Kyoung-Ryul;Park, So-Hee
    • KIEAE Journal
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    • v.7 no.6
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    • pp.23-28
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    • 2007
  • Limited fossil fuels and unstable energy supply are considered as one of the critical problems in architecture requiring large amounts of energy. In order to this challenge, environment-friendly architecture design is required. Clear data should be prepared to apply solar energy to architecture aggressively and properly. This study used FS statistical analysis data regarding average daily solar radiation of Seoul observed over 20 years to find out standard year and standard daily solar radiation. This study also aims to compare and evaluate an appropriate method of selecting a standard year which is too close to measurement value through comparison and analysis with daily solar radiation acquired by applying overseas researchers' suggesting weight factor. As a result, the data nearest to measurement value of daily solar radiation was UK CIBSE TRY(TYPE 2) displaying 0.100in t-statistic index. For UK CIBSE TRY(TYPE 2), weight factor was applied to three climatic elements except relative humidity. TYPE 1 and TYPE 3 recorded 0.343 and 0.367, respectively, showing higher record of t-statistic than TYPE 2. TYPE 1 was calculated through FS statistical value of single data about daily solar radiation with other climatic elements excluded. For TYPE 3, relative humidity was added to TYPE 2. In particular, since TYPE 2 was closer to the measurement value compared to the others, it is necessary to consider relationship with other climate elements if other climate elements are added.