• Journal of Crop Science and Biotechnology
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• 제10권1호
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• pp.13-18
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• 2007

Near-infrared spectroscopy(NIRS) was used as a rapid and nondestructive method to determine the fatty acid composition in intact seed samples of rapeseed(Brassica napus L.). A total of 349 samples(about 2 g of intact seeds) were scanned in the reflectance mode of a scanning monochromator, and the reference values for fatty acid composition were measured by gas-liquid chromatography. Calibration equations for individual fatty acids were developed using the regression method of modified partial least-squares with internal cross validation(n=249). The equations had low SECV(standard errors of cross-validation), and high $R^2$(coefficient of determination in calibration) values(>0.8) except for palmitic and eicosenoic acid. Prediction of an external validation set(n=100) showed significant correlation between reference values and NIRS estimated values based on the SEP(standard error of prediction), $r^2$(coefficient of determination in prediction), and the ratio of standard deviation(SD) of reference data to SEP. The models developed in this study had relatively higher values(> 3.0 and 0.9, respectively) of SD/SEP(C) and $r^2$ for oleic, linoleic, and erucic acid, characterizing those equations as having good quantitative information. The results indicated that NIRS could be used to rapidly determine the fatty acid composition in rapeseed seeds in the breeding programs for high quality rapeseed oil.

• 한국통신학회논문지
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• 제33권10B호
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• pp.928-938
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• 2008

인터넷 전화와 같이 품질 보장을 요구하는 서비스가 널리 보급되고 있으나 대부분의 인터넷 백본 네트워크는 이들을 최선형 서비스와 구별할 수 없다. 따라서 백본 네트워크가 품질 보장형 서비스의 품질조건을 충족시키면서 수용할 수 있는 최대 트래픽 량인 유효 용량을 파악하는 것은 인터넷 서비스 제공자 입장에서 매우 중요하다. 본 논문에서는 인터넷 백본 네트워크의 유효 용량을 평가할 수 있는 ns-2 기반 테스트-베드를 제안한 후 이를 이용하여 인터넷 전화 품질 기준 측면에서 실험 백본 네트워크의 유효 용량을 평가한다. 평가결과 실험 백본 네트워크의 유효 용량은 최대지연 보장 확률에 따라 물리적 용량의 $12%\;{\sim}\;55%$로 추정되었으며, 인가되는 트래픽의 유형과 인터넷 전화 품질 기준에 큰 영향을 받음을 알 수 있었다. 특히 백본 네트워크의 유효 용량을 높이기 위해서 인터넷 전화의 단대단 최대 지연시간의 보장 확률을 낮출 필요가 있음을 보였다.

• Safety and Health at Work
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• 제10권2호
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• pp.196-204
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• 2019

Background: Liquid chromatography-tandem mass spectrometry (LC-MSMS) for simultaneous analysis of multiple microbial secondary metabolites (MSMs) is potentially subject to interference by matrix components. Methods: We examined potential matrix effects (MEs) in analyses of 31 MSMs using ultraperformance LC-MSMS. Twenty-one dust aliquots from three buildings (seven aliquots/building) were spiked with seven concentrations of each of the MSMs ($6.2pg/{\mu}l-900pg/{\mu}l$) and then extracted. Another set of 21 aliquots were first extracted and then, the extract was spiked with the same concentrations. We added deepoxy-deoxynivalenol (DOM) to all aliquots as a universal internal standard. Ten microliters of the extract was injected into the ultraperformance LC-MSMS. ME was calculated by subtracting the percentage of the response of analyte in spiked extract to that in neat standard from 100. Spiked extract results were used to create a matrix-matched calibration (MMC) curve for estimating MSM concentration in dust spiked before extraction. Results: Analysis of variance was used to examine effects of compound (MSM), building and concentration on response. MEs (range: 63.4%-99.97%) significantly differed by MSM (p < 0.01) and building (p < 0.05). Mean percent recoveries adjusted with DOM and the MMC method were 246.3% (SD = 226.0) and 86.3% (SD = 70.7), respectively. Conclusion: We found that dust MEs resulted in substantial underestimation in quantifying MSMs and that DOM was not an optimal universal internal standard for the adjustment but that the MMC method resulted in more accurate and precise recovery compared with DOM. More research on adjustment methods for dust MEs in the simultaneous analyses of multiple MSMs using LC-MSMS is warranted.

• 자원ㆍ환경경제연구
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• 제31권1호
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• pp.31-50
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• 2022

이 연구는 배출자부담원칙을 달성하는 적정 수준의 종량제 봉투 가격을 추정한다. 이 연구의 주요한 기여는 기존 연구와 달리 생활폐기물 배출 수요함수와 생활폐기물 처리비용함수 간의 구조적 관계를 이용하여 새로운 균형 가격을 찾았다는 점이다. 추정방법은 고정점 반복법을 이용한다. 주요 연구 결과는 다음과 같다. 배출자부담원칙이 달성되는 조건을 생활폐기물 처리에 대한 총수입과 총비용이 일치하는 점으로 정의하고, 단순하게 산술적으로 계산하면 종량제 봉투 가격은 현재보다 약 3.12배 높은 수준에서 정해져야 한다. 그러나 구조적 관계를 이용하여 추정한 결과는 종량제 봉투 가격이 현재보다 약 4배 높은 수준에서 정해질 필요가 있음을 보여준다. 이러한 결과는 고정비용의 존재로 인하여 폐기물당 처리비용이 이전보다 높아지기 때문이다. 추정된 적정 가격을 적용할 경우 전국적으로 생활폐기물 발생량은 약 10% 정도 감소하는 것으로 나타난다.

• 대한토목학회논문집
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• 제44권4호
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• pp.555-565
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• 2024

정부에서는 건설폐기물의 재활용을 높이기 위해서 분별해체를 강제하기 위해 법률규정을 제정하였다. 따라서 본 연구는 대규모 택지 조성을 위한 분별해체 공사의 공사비 산정을 위한 필수적인 요소로서 원단위를 제안하는 것을 목표로 한다. 이를 위해 4채의 단독주택을 선정하고 현장 조사와 실험을 하였다. 주택을 실측하여 도면을 작성하고 내장재를 정밀 조사하여 분별해체 작업의 공사비 산정을 위한 원단위를 제안하였다. 분별해체 작업은 천장, 벽, 바닥 등으로 부위별로 구분하여 진행하였고 부위별, 재료별로 작업 시간을 측정하였다. 특히 벽의 개구부를 구성하는 창문 등에 대한 보정 작업을 시행하여 기존 연구와의 차별성을 확보하고 정확성을 향상했다. 이러한 연구 결과는 실무에 즉시 적용할 수 있는 구체적인 지침으로 활용될 것으로 기대되며, 건설 분야의 지속 가능한 발전을 촉진할 것으로 기대된다.

• 지역연구
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• 제9권2호
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• pp.59-69
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• 1993

This paper empirically analyzes economic impacts of policy instruments and suggests policy alternations to improve the urban poor's alternatioes to improve the urban poor's standard of living in Korea. By estimating a joint decsim model of hours of work and housing demand utilizing a sample of 270 urban poor housholds, the study finds that the efects of policies dre diverse. The dncome subsidy to msst effectwe in increasing comsumption while the wage increase is least likely to decrease hours of work. Policy suggection are firstly that policies to ward the urban poor should hot be overlapping or contradictory, and secondly that the policies should be able to increase the poor's wage earning abiliby.

• 한국BIM학회 논문집
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• 제3권1호
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• pp.11-20
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• 2013

Mix-used development in urban renewal project is done to effectively utilize the limited downtown. Generally unlike a single project, It features placing a large number of different facilities(residential, commercial, business, cultural, etc.) which is each other organically linked. The purpose of this study is to suggest the method of modeling guide for 3D preliminary cost estimation considering visual and intuitive judgement of space in mix-used development Urban Renewal project. In this research, introducing SME(Standard Module and Element) breakdown structure, FID(Finish Identity) for estimating building space unit-based quantity take off was implemented. It could narrow the discrepancy of opinion between the stakeholders with more accurate cost-estimates, comparing to the traditional methods.

• Journal of Biosystems Engineering
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• 제15권1호
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• pp.23-32
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• 1990

Geometrical characteristics of fruit including perimeter, projected area and length of minor and major axis were calculated by computer programs to be used in fruit sorting by image processing system. The results are summerized as follows. 1. A program calculating perimeter, projected area, and length of minor and major axis by edge detection and chain code was developed. 2. Geometrical characteristics of given figures were calculated to verify the program and the discrepancies from the measured values were about 5%. 3. Regression models for estimating volums of apples were developed and regression coefficients for each variety were found. 4. Abnormal apples could be recognized by comparing the ratio of minor axis to major axis and the standard value was proposed.

• 산업경영시스템학회지
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• 제28권2호
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• pp.81-93
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• 2005

The main purpose of this paper Is to develop the Management Resource Analysis System for KOTRA which is based on Activity Based Costing(ABC). Because the products and services of KOTRA are exclusive and include a government subsidy, we need develop a different system from the private firm's ABC system. The Management Resource Analysis System that we propose is embodied using JAVA and JSP within an UNIX environment and developed as a Web-enabling base. It is expected for aiding a manager's decision-making such as resource inquiry, standard resource analysis, estimating the ratio of a government subsidy, case based reasoning, what-if analysis. The results of this paper suggest what points are to be considered when we apply ABC for Government Investment Corporation.

• International Journal of Aeronautical and Space Sciences
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• 제13권3호
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• pp.323-331
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• 2012

A simple and robust methodology is presented to determine the location and amount of crack in beam like structures based on the incremental particle swarm optimization technique. A comparison is made for assessing the performance of standard particle swarm optimization and the incremental particle swarm optimization technique for detecting crack in structural members. The objective function is formulated using the measured natural frequency of the intact structure and the frequency obtained from the finite element simulation. The outcomes of the simulated results demonstrate that the developed method is capable of detecting and estimating the extent of damages with satisfactory precision.