• Title/Summary/Keyword: energy index

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Current Status and Prospect of Quality Evaluation in Malting Barley (맥주보리 품질평가 현황과 전망)

  • 손영구;서세정;백성범;이춘우;박문웅;한상익
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.47
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    • pp.55-62
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    • 2002
  • With lower quality and three to four times higher price than those of imported malting barley, the competitiveness of domestic malting barley is decreasing. Although the causes can be found in that the domestic environments are much unfavorable to cultivate the malting barley compared with those of USA or Canada, it is mainly reasoned from poorer developments in variety of high quality malting barley as well as in cultivation technology. For assuring the competitiveness of domestic malting barley, therefore, not only the development of high quality malting barley suitable to the climatic environment of this country but also the political supports of the government are required. Also, in addition to the breeding of the good quality malting barley haying higher germinative energy, and heavier and larger kernels of good plumpness as well as lower protein content, the modification of quality inspection standards from the system relying only on the visual characteristics such as kernel size distribution rate, shrimped kernel rate, foreign materials and so on, to such system as those of developed countries haying quality criteria such as protein content for inspection is absolutely required for the quality improvement of domestic malting barley.

A Study on Characteristics of Damageability and Repairability with Similar Platform Type at Low Speed 40% Offset Crash Test (동일 플렛폼 차량에 대한 저속 충돌시 손상성 수리성에 미치는 영향에 관한 연구)

  • Lim, Jong-Hun;Park, In-Song;Heo, Seung-Jin
    • Transactions of the Korean Society of Automotive Engineers
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    • v.13 no.2
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    • pp.108-113
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    • 2005
  • The damageability and repairability of similar platform type vehicles could be very concerned with design optimization. In all the vehicles crash tested, small size passenger vehicles were weakness in aspect of damageability and repairability. The most critical area appears to be repair cost considering that parts cost is the largest portion of total repair cost segments. Besides repair cost, attaching method of front sidemember and subframe are placed special importance for impact energy absorption and damageability and repairability. So in order to improve damageability and repairability of vehicle structure and body component of the monocoque type passenger vehicles, the end of front side member and front back beam should be designed with optimum level and to supply the end of front side member as a partial condition approx 300mm. The effectiveness of design concept on the 40% offset frontal impact characteristics of the passenger vehicle structure is investigated and summarized.

A Study on Relationship between Fuel Characteristics and Combustion Characteristics of Reformed Diesel Fuels by Ultrasonic Irradiation (I) - Relationship between Chemical Structure and Higher Heating Value (초음파 개질 경유의 연료특성과 연소특성의 상관관계에 관한 연구 (I) -화학구조와 발열량과의 상관성)

  • 이병오;류정인
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.6
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    • pp.72-79
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    • 2002
  • The main objective of this study is to investigate the relationship between chemical structure and higher heating value of reformed diesel fuels by ultrasonic irradiation. In order to analyze the chemical structure changes of the reformed diesel fuels by ultrasonic irradiation, Proton nuclear magnetic resonance spectrometer(1H-NMR) was used and to analyze the effect of higher heating values of these diesel fuels, the bomb calorimeter was used. From the study, following conclusive remarks can be made. 1) The aromatic carbon percentages and higher heating values of the reformed diesel fuels by ultrasonic irradiation increased more than the conventional diesel ones. 2) The aromatics percentages and Branch Index(BI) of the reformed diesel fuels by ultrasonic irradiation decreased more than the conventional diesel ones. 3) The higher heating values on both for conventional fuel and reformed diesel fuels by ultrasonic energy irradiation is directly proportional to aromatic carbon percentages and inversely proportional to aromatic percentages and BI for these fuels.

Linear Seismic Performance Evaluation Procedure of the Low-Rise Reinforced Concrete Facilities (저층 철근 콘크리트 시설물 선형 내진 성능 평가)

  • Kim, Doo-Hwan;Jeong, Ui-Do;Song, Kwan Kwon;Kim, Seong Pil
    • Journal of Korean Association for Spatial Structures
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    • v.18 no.2
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    • pp.129-135
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    • 2018
  • Following a 5.8 magnitude earthquake on September 12, 2016 in Gyeongju Province, a magnitude 5.4 earthquake occurred in the northern region of Pohang City on November 15, 2017 in South Korea. Only 7.9 % of the building structures are earthquake-resistant, according to the recent survey conducted by the government agencies in October 2017. In this paper, the linear analysis seismic performance evaluation procedure of the existing school structures presented in the revised methodology(Seismic Performance Evaluation Procedure and Rehabilitation Manual for School Facilities) was introduced. In this paper, the linear analysis evaluation procedure presented in the revised methodology was introduced and the seismic performance index of the example structure was evaluated using the linear analysis evaluation procedure. The seismic retrofit was verified by the linear and nonlinear dynamic analyses using Perform 3D. The analysis results show that the dissipated inelastic energy is concentrated on the retrofitted shear wall and the maximum inter-story drift of the stadium model structure with damping system satisfies the requirement of the current code.

Reliability-Based Design Optimization of Electromagnetic Devices by Evaluating Probabilistic Constraints Based on Performance Measure Approach (목표 성능치 기반의 확률구속조건 평가 기법을 이용한 전자기 장치의 신뢰도 기반 최적설계)

  • Kim, Dong-Wook;Kim, Dong-Hun
    • Journal of the Korean Magnetics Society
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    • v.23 no.2
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    • pp.62-67
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    • 2013
  • This paper introduces an effective methodology for reliability-based design optimization of electromagnetic products, where a performance measure approach is adopted to accurately assess probabilistic constrains. Two design problems consisting of a loudspeaker and a superconducting magnetic energy storage system are considered. The efficiency of the proposed method in evaluating the failure probability of performances during the optimization process are compared with the existing method based on the reliability index approach. Moreover, in term of the accuracy of probability failure values, optimized design results are examined with reference values obtained from the Monte Carlo simulation.

Effect of porosity on the bending and free vibration response of functionally graded plates resting on Winkler-Pasternak foundations

  • Benferhat, Rabia;Daouadji, Tahar Hassaine;Mansour, Mohamed Said;Hadji, Lazreg
    • Earthquakes and Structures
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    • v.10 no.6
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    • pp.1429-1449
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    • 2016
  • The effect of porosity on bending and free vibration behavior of simply supported functionally graded plate reposed on the Winkler-Pasternak foundation is investigated analytically in the present paper. The modified rule of mixture covering porosity phases is used to describe and approximate material properties of the FGM plates with porosity phases. The effect due to transverse shear is included by using a new refined shear deformation theory. The number of unknown functions involved in the present theory is only four as against five or more in case of other shear deformation theories. The Poisson ratio is held constant. Based on the sinusoidal shear deformation theory, the position of neutral surface is determined and the equation of motion for FG rectangular plates resting on elastic foundation based on neutral surface is obtained through the minimum total potential energy and Hamilton's principle. The convergence of the method is demonstrated and to validate the results, comparisons are made with the available solutions for both isotropic and functionally graded material (FGM). The effect of porosity volume fraction on Al/Al2O3 and Ti-6Al-4V/Aluminum oxide plates are presented in graphical forms. The roles played by the constituent volume fraction index, the foundation stiffness parameters and the geometry of the plate is also studied.

EVALUATION 01 OIL DISPERSION AGENT BY ASSESSMENT 01 COLOR STRENGTH 01 ORGANIC PIGMENT

  • H., Young-Chan;R., Seo-Joon;L., Dong-Wook;H., Soon-Taek
    • Journal of the Society of Cosmetic Scientists of Korea
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    • v.24 no.3
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    • pp.73-80
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    • 1998
  • This Study was performed to get the suitable oil dispersion agent by assessment of color strength of organic pigment in non-aqueous systems. Organic pigment is used as a color expression material with other body pigments in the make-up products. But occasionally aggregation or agglomeration occurs for the lack of affinity with medium, This function is the cause of disturbing homogeneous dispersion, and then bring about an instability of products. Our study, research of dispersion mechanism between the pigment and oil phase, has been executed to solve this problem, and find a oil dispersion agent having optimum dispersion condition. Generally dispersion is related to between the solid-liquid mutual properties and electrical phenomena associated with solid-liquid interface. This factor is determined to input energy, milling time, optical properties, particle size, rheological properties, etc. Ideal dispersion state is told that coloring primary solid particle is homogeneously dispersed in medium. Good dispersed colorants are strongly and clearly appeared. We are already known that the particle size of organic pigment, chemical properties and viscosity of medium, refractive index. Consequently We determine the affinity of medium and organic pigment by measuring of color strength in the same mechanical condition. UV-VISIBLE RECORDING SPECTRO PHOTOMETER is used for measuring apparatus. We can decided the dispersion level of oil dispersion agent by measuring absorbance of color strength in the visible range that diluted medium for colloid colorant particles.

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Stress and Nutrient Intakes by the Degree of Obesity in Female College Students (비만도에 따른 여대생의 스트레스와 영양소 섭취)

  • Hwang, Haet-Bit;Ro, Hee-Kyung
    • Journal of Integrative Natural Science
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    • v.4 no.4
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    • pp.332-338
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    • 2011
  • This study was conducted to find associations of stress with obesity in female college students in Gwangju. 343 subjects were divided into two groups based on BMI(body mass index). BMI of normal group was $19.3{\pm}1.5$ while that of obese group was $26.4{\pm}3.6$. The measured stress level in obese subjects was higher and they were less capable of controlling obese oriented attitude compared to normal subject. Twenty four hour dietary recall revealed that nutrient intakes of obese subjects were higher in energy, lipid, P and cholesterol. However, they were more deficient in Ca, Fe and vitamin A, compared to those of normal ones. This study suggested severe stress might trigger undesirable dietary behavior leading to increase in food consumption which contribute to obesity. Effective nutrition education program targeting obese female students should be developed and implemented to relieve stress and practice desirable dietary behavior and eating pattern.

Adaptive Analysis and Error Estimation in Meshless Method (무요소 방법에서의 적응적 해석을 위한 오차의 평가)

  • 정흥진
    • Computational Structural Engineering
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    • v.11 no.1
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    • pp.261-274
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    • 1998
  • In this paper, local and global error estimates for the element-free Galerkin (EFG) method are proposed. The essence of proposed error estimates is to use the difference between the values of the projected stress and these given directly by the EFG solution. The stress projection can be obtained simply by taking product of shape function based on a different domain of influence with the stresses at nodes. In this study, it was found that the effectivity index is optimized if the domain of influence in stress projection procedure is the smallest that retains regularity of the matrices in EFG. Numerical tests are shown for various 1D and 2D examples illustrating the good effectiveness of the proposed error estimator in the global energy norm and in the local error estimates.

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Adsorption Behavior of Sr Ion on Calcium-Alginate-Chitosan (Calcium-Alginate-Chitosan의 스트론튬 이온 흡착 거동)

  • Lan, Dong;Bing, Deng;Lanlan, Ding;Qiong, Cheng;Yong, Yang;Yang, Du
    • Polymer(Korea)
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    • v.38 no.5
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    • pp.557-565
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    • 2014
  • Sodium alginate and chitosan are added to a $CaCl_2$ solution to prepare calcium-alginate-chitosan and calciumalginate gels. After dehydration through stoving, two types of adsorbent particles are obtained. The adsorption process of the particles obtained for low concentrations of $Sr^{2+}$ satisfies a second-order kinetic equation and the Freundlich adsorption model. The thermodynamic behaviors of the particles indicate that adsorption occurs via a spontaneous physical process. XPS pattern analysis is used to demonstrate the adsorption of $Sr^{2+}$ by calcium alginate and chitosan. By building an interaction model of the molecules of chitosan and alginate with $Ca^{2+}$ and $Sr^{2+}$ to calculate energy parameters, Fukui index, Mulliken charge, and Mulliken population, adsorption of $Sr^{2+}$ on the molecular chains of chitosan as well as the boundary of calcium-alginate-chitosan is observed to show weak stability; by contrast, adsorption between molecular chains is high.