• Proceedings of the Korean Society of Precision Engineering Conference
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• 2006.10a
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• pp.61-62
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• 2006

• Proceedings of the KIEE Conference
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• 1999.11b
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• pp.213-215
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• 1999

This paper presents a transmission cost allocation through application of a new reliability index in transmission pricing in competitive electric industry. The proposed method allocates a fair use of transmission system charge given separately to individual generator by capacity usage, based on the contribution of individual generator considering N-1 contingency in reliability margin of transmission capacity, and offers more alternatives of pricing in using transmission capacity and transmission margin.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1991.04a
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• pp.143-149
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• 1991

기계공업의 발전과 함께 각종의 기계, 장치 및 기기등은 보다 고정도와, 다기능화 및 고품질화가 계속 추구되어 있다. 그러나, 이러한 개선 및 개량이 이루어지기 위해서는 필연적으로이에 들어가는 각종 부품들의 고정도화와 고품질화가 선행되어져아 한다. 본 연구에서는 이러한 제반의 문제점 내지는 결함을 어느정도 해결하고 현장 및 측정실에서도 용이하게 이용할 수 있는 INDEX HEAD를 이용한 절대 진원도의 측정법(일종의 양쎈터 지지법)을 제안하고자 한다.

• Structural Engineering and Mechanics
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• v.42 no.5
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• pp.609-629
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• 2012

This study deals with the assessment of low and mid rise multi-story buildings made of stone and /or brick, composite steel and masonry slabs from the sixties, known to be vulnerable to seismic hazard using the "vulnerability index" method based on buildings survey following Ain Temouchent (1999) and Boumerdes (2003) earthquakes, from where vulnerability curves are constructed using the translation method. The results obtained for the case study confirm what has been observed in situ.

• IE interfaces
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• v.9 no.1
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• pp.53-62
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• 1996

The Delphi method is widely used for long and middle range forecasting in management science. It is a method by which the subjective data of experts are made to converge using statistical analysis. The Fuzzy Delphi Method(F.D.M.), anew application of the Delphi method using Triangular Fuzzy Numbers(T.F.N.), can help to predict the uncertainty, synthesize the opinion and calculation of those assumed dissemblance index and fuzzy distance. Furthermore, the programming of the F.D.M. process to feed paper and data back to experts can make them more accurately predict the various information.

• Journal of applied mathematics & informatics
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• v.23 no.1_2
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• pp.547-552
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• 2007

In this note, we extends some of the results of Liu [Fuzzy Sets and systems 157 (2006) 869-878]. This extension consists of a simple proof involving weighted functions and their preference index. We also give an elementary simple proof of the maximum entropy weighting function problem with a given preference index value without using any advanced theory like variational principles or without using Lagrangian multiplier methods.

• Communications of the Korean Mathematical Society
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• v.36 no.2
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• pp.389-400
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• 2021

For a graph G, the variable sum exdeg index SEI_a(G) is defined as Σ_u∈V(G)d_G(u)a^d_G(u), where a ∈ (0, 1) ∪ (1, +∞). In this work, we determine the minimum and maximum variable sum exdeg indices (for a > 1) of n-vertex cactus graphs with k cycles or p pendant vertices. Furthermore, the corresponding extremal cactus graphs are characterized.

• Korean Journal of Materials Research
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• v.29 no.7
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• pp.437-442
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• 2019

Green $BaSi_2O_2N_2:0.02Eu^{2+}$ phosphor is synthesized through a two-step solid state reaction method. The first firing is for crystallization, and the second firing is for reduction of $Eu^{3+}$ into $Eu^{2+}$ and growth of crystal grains. By thermal analysis, the three-time endothermic reaction is confirmed: pyrolysis reaction of $BaCO_3$ at $900^{\circ}C$ and phase transitions at $1,300^{\circ}C$ and $1,400^{\circ}C$. By structural analysis, it is confirmed that single phase [$BaSi_2O_2N_2$] is obtained with Cmcm space group of orthorhombic structure. After the first firing the morphology is rod-like type and, after the second firing, the morphology becomes round. Our phosphor shows a green emission with a peak position of 495 nm and a peak width of 32 nm due to the $4f^65d^1{\rightarrow}4f^7$ transition of $Eu^{2+}$ ion. An LED package (chip size $5.6{\times}3.0mm$) is fabricated with a mixture of our green $BaSi_2O_2N_2$, and yellow $Y_3Al_5O_{12}$ and red $Sr_2Si_5N_8$ phosphors. The color rendering index (90) is higher than that of the mixture without our green phosphor (82), which indicates that this is an excellent green candidate for white LEDs with a deluxe color rendering index.

• Journal of Industrial Convergence
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• v.19 no.3
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• pp.83-90
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• 2021

The purpose of this study was to investigate the effect of scapular stabilization exercise and thoracic joint mobilization on scapular position, scapular motion and shoulder pain and disability index(SPADI) in adults with scapular dysfunction. A total 42 subjects were divided into a scapular stabilization exercise group(A, n=14), a thoracic joint mobilization group(B, n=14) and scapular stabilization exercise with thoracic joint mobilization group(C, n=14) and performed exercise and joint mobilization three times per week for four weeks, total 12 times. As for changes in scapular position among the groups, group C showed statistically significant increase(p<.05). In changes of scapular motion among the groups, group C showed statically significant improvement in shoulder abduction 45° and 90° both(p<.05), In changes of SPADI among the groups, group C were showed statistically significant improvement(p<.05). In conclusion, scapular stabilization exercise and thoracic joint mobilization were effective on improving scapular position, movement and SPADI score in adults with scapular dysfunction.

• Journal of Korean Society of Transportation
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• v.19 no.2
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• pp.73-73
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• 2001