• Korean Journal of Chemical Engineering
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• 제35권12호
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• pp.2348-2354
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• 2018

We designed a conceptual model of the 2.3-BDO dehydration process using a hydroxyapatite-alumina catalyst and estimated its economic feasibility to predict the appropriate range of the purchase price of 2,3-BDO on commercial scale. The conceptual design and economic analysis can offer valuable information for the industrial application of 2,3-BDO because the most relevant studies have limitation in laboratory scale. Furthermore, the adequate range of 2,3-BDO price, in which the process has profitability, was investigated with the current market prices of 1,3-BD. The investigated price in terms of 2,3-BDO dehydration can pertain to estimation of the economic feasibility in 2,3-BDO production process.

• Journal of Magnetics
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• 제10권3호
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• pp.113-117
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• 2005

Some polycrystalline ferromagnetic mms are composed of continuously connected nanometer scale islands with random crystallite orientations. The nanometer perturbations of the mm introduce a large number of nearly degenerate local field configurations that are indistiguishable on a macroscopic scale. As a first step, this situation is modelled as a thin ferromagnetic disc coupled by exchange and dipole interactions to a homogeneous ferromagnetic plane, where the disc and plane have different easy axes. The model is solved to find the partial $N\acute{e}el$ domain walls that minimize the magnetic energy. The two solutions give a bistable configuration that, for appropriate geometries, provides an important microsopic ferromagnetic degree of freedom for the mm. These results are used to interpret recent measurements of exchange biased bilayer films.

• Computers and Concrete
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• 제30권4호
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• pp.269-276
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• 2022

In this paper, frequency vibrations of double-walled carbon nanotubes (CNTs) has been investigated based upon nonlocal elastic theory. The inference of small scale is being perceived by establishing nonlocal Love shell model. The wave propagation approach has been operated to frame the governing equations as eigen value system. An innovational nonlocal model to examine the scale effect on vibrational behavior of armchair, zigzag and chiral of double-walled CNTs. An appropriate selection of material properties and nonlocal parameter has been considered. The influence of dimensionless nonlocal parameter has been studied in detail. The dominance of end condition via nonlocal parameter is explained graphically. The results generated furnish the evidence regarding applicability of nonlocal shell model and also verified by earlier published literature.

• 한국농림기상학회:학술대회논문집
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• 한국농림기상학회 2001년도 춘계 학술발표논문집
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• pp.151-152
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• 2001

A common problem of the model simulations of the land surface - atmosphere interaction is to choose the appropriate spatial scale and resolution at which the simulations are to be performed. The accuracy of energy and water exchange predictions between the land surface and the atmosphere in regional and global scale atmospheric models is mainly influenced by: model simplifications applied to describe the spatial heterogeneity of land surface properties within individual grid cells; ignoring the variability of sub-grid properties (e.g. relief, vegetation, soils), and; lacks of necessary input meteorological and biophysical data.(omitted)

• 대한임베디드공학회논문지
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• 제18권2호
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• pp.67-73
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• 2023

Tree routing is one of appropriate routing schemes in wireless sensor network because the complexity of this approach is relatively low. But, congestion at a specific node may happen because a parent node toward a sink node is usually selected in one hop way, specially where large number of node are deployed. As feasible solution for this problem, multiple paths and sinks schemes can be applied. However, the performance of these schemes are not proved and analyzed yet. In this paper, we conduct diverse simulaton scenarios performance evaluation for these cases to identify the improvement and analyze the impact of schemes. The performance is measured in the aspects of packet transmission rate, throughput, and end-to-end delay as a function of amount of network traffic.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2002년도 춘계학술대회 논문집
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• pp.277-282
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• 2002

The objective of this study is to suggest the optimal method for reinforced earth retaining wall through the appropriate selection of reinforcing materials, development of design criteria. Thus, the efficient land utilization and securing safety in the train operation in service lines could be achieved. For this goal, a large scale shear laboratory test was carried out to evaluate the reinforced effect of earth body reinforced by attachment-type geogrid.

• 한국국방경영분석학회지
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• 제26권1호
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• pp.34-46
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• 2000

The object of this study is to construct a model for an optimal allocation of short surface to air missile defending our targets most efficiently from hostile aircraft´s attack. For the purpose of this, we analyze and establish facility allocation concept of existing models, apply set covering theory appropriate to problem´s properties, present the process of calculating the probability of target being protected, apply Sherali-Kim´s branching variable selection strategy, and then construct the model. As constructed model apply the reducing problem with application, we confirm that we can apply the large scale, real problem.

• 천문학회보
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• 제43권2호
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• pp.32.2-32.2
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• 2018

As computational resolution of modern cosmological simulations reach ever so close to resolve individual star-forming clumps in a galaxy, a need for "resolution-appropriate" physics for a galaxy-scale simulation has never been greater. To this end, we introduce a self-consistent numerical framework that includes explicit treatments of feedback from star-forming molecular clouds and massive black holes. We perform a state-of-the-art cosmological simulation of a quasar-host galaxy at z~7.5, and demonstrate that previously undiscussed types of interplay between galactic components may hold important clues about the growth and impact of quasar-host galaxies.

• 국제학술발표논문집
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• The 1th International Conference on Construction Engineering and Project Management
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• pp.768-773
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• 2005

Among various joint ventures, International Construction Joint Ventures (ICJVs) have emerged as a popular approach worldwide to developing large scale projects through international participation. A model, based on economic analysis and represented by several hypotheses obtained from the analysis, will be developed. Furthermore, we will empirically test the hypotheses/model using Structural Equation Model (SEM). This research is expected to explain why there exist different organizational forms for ICJVs, and to develop a framework for choosing appropriate forms with respect to various characteristics of ICJVs.

• 교육녹색환경연구
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• 제17권3호
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• pp.54-64
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• 2018

경상남도 8개시와 9개 군지역 총 17개시 482 개교 학생수와 학급수 조사 분석을 실시하여 적정규모 정책에 대한 기초자료를 제공하고자 실시한 본 연구결과는 다음과 같다. 첫째, 경상남도 8개시 동지역의 전체 206개 초등학교중 대규모 학교가 65개교(31.6 %), 적정규모 학교는 107개교(51.9 %)로 대부분을 차지하고 있고, 300명 미만의 소규모 학교는 35개교(17.0 %)로 나타났다. 시 읍면지역내 초등학교 138개교중 대규모 학교는 16개교(11.6 %), 적정규모학교는 25개교(18.1 %)로 적은데 비하여 소규모학교가 97개교(70.3 %)로 대부분을 차지하고 있고, 이중 150명 미만의 소규모 학교는 14개교(10.1 %)를 차지하고 있다. 둘째, 경상남도 9개 군 지역의 전체 137개 초등학교중 대규모 학교가 3개교(2.2 %), 적정규모 학교는 17개교(12.4 %)로 적은 편이며, 300명 미만의 소규모 학교는 117개교(85.4 %)로 이중 150명 미만의 소규모 학교가 111개교(81.0 %)로 대부분을 차지하고 있다. 셋째, 시 동지역, 시 읍면지역, 군지역으로 세분하여 분석한 결과 시 동지역과 달리 시 읍면지역과 군지역에서는 소규모 학교와 극소규모학교가 대부분을 차지하고 있었다. 따라서 시 읍면지역과 군지역 학교 교육환경을 고려한 시지역 학교와 차별화된 시 읍면지역과 군지역의 특성을 고려한 적정규모 정책 수립이 필요할 것으로 판단된다.