• 대한전기학회논문지
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• 제33권10호
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• pp.410-422
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• 1984

This paper presents a new practical method for optimal active and reactive power control for the economic operation in electrical power system, and the programs are developed for digital computer solution. The major features and techniques of this paper are as follows: 1) The method is presented for finding the equivalent active power balance equation applying the sparse Jacobian matrix of power flow equation instead of using B constant as active power balance equation considering transmission loss, and thus for determining directly optimal active power allocation berween generator unitw satisfying the equality and inequality constraints. 2) The method is proposed for solving directly the optimum economim dispatch problem without using gradient method and penalty function for both active and reactive power control. As a result, the computing time are reduced and convergence characteristic is remarkably improved. 3) Unlike most of conventional methods which adopt the transmission loss as a objective function for reactive power control, the total fuel cost of themal power plant is adopted as objective function for both active and reactive power control. consequently, more reasonable and economic profit can be achieved.

• 대한전기학회논문지
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• 제32권4호
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• pp.145-154
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• 1983

This paper presents a new method for optimal real and reactive power dispatch for the economic operation of a power system. Unlike the usual approach of minimizing the transmission loss, this method minimizes the total production cost not only for the real power optimization problem, but also for the reactive power optimization. The control variables are real power generation of units for real power optimization, and reactive power optimization. The constraints are the operating limits on these control variables and the limits on the bus voltages. Methematical models are developed to represent the sensitivity relationships between dependent and control variables for both real and reactive power optimization modules, and thus eliminate the use of B-coefficients. In order to handle many functional inequality constraints, a modified version of the gradient projection method is developed for optimization procedure, and has shown a remarkable advantage in computation efficiency.

• Korean Journal of Mathematics
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• 제24권2호
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• pp.273-296
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• 2016

Some new trace inequalities for convex functions of self-adjoint operators in Hilbert spaces are provided. The superadditivity and monotonicity of some associated functionals are investigated. Some trace inequalities for matrices are also derived. Examples for the operator power and logarithm are presented as well.

• 대한수학회보
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• 제49권1호
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• pp.33-47
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• 2012

In this paper, the log-convexity of another class one-parameter mean is investigated. As applications, some new upper and lower bounds of logarithmic mean, new estimations for identric mean and new inequalities for power-exponential mean and exponential-geometric mean are first given.

• Kyungpook Mathematical Journal
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• 제51권1호
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• pp.59-68
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• 2011

In this paper, we first give the definition of degenerate weakly ($k_1$, $k_2$-quasiregular mappings by using the technique of exterior power and exterior differential forms, and then, by using Hodge decomposition and Reverse H$\"{o}$lder inequality, we obtain the higher integrability result: for any $q_1$ satisfying 0 < $k_1({n \atop l})^{3/2}n^{l/2}\;{\times}\;2^{n+1}l\;{\times}\;100^{n^2}\;\[2^l(2^{n+3l}+1)\]\;(l-q_1)$ < 1 there exists an integrable exponent $p_1$ = $p_1$(n, l, $k_1$, $k_2$) > l, such that every degenerate weakly ($k_1$, $k_2$)-quasiregular mapping f ${\in}$ $W_{loc}^{1,q_1}$ (${\Omega}$, $R^n$) belongs to $W_{loc}^{1,p_1}$ (${\Omega}$, $R^m$), that is, f is a degenerate ($k_1$, $k_2$)-quasiregular mapping in the usual sense.

• 가족자원경영과 정책
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• 제10권4호
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• pp.179-193
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• 2006

Gender equality has been expected to realize fully in the process of globalization. According to neo-liberal, which views globalization as a rational development, irrational discrimination by culture will disappear. But some feminists criticize globalization as a patriarchal phenomenon. So in this paper, the extent to which women in Korea have achieved equality with men in the workforce is assessed through an examination of the gender gap during 1993-2003. As the result, it was found that women had still lower status than men in spite of laws established to promote gender equality. Then to explore the direction for eliminating the patriarchal gaps, women in traditional Korea were reviewed. Traditionally women were oppressed by the practice of Naeoe differentiating between women and men. But on the other hand it made women to have equal status with men by maintaining their own productive area. So it was suggested that differentiation should be considered as a source of power to be adopted into women's activitism such as NGOs or international women' movement to achieve full equality in inequitable globalization.

• 한국수학교육학회지시리즈A:수학교육
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• 제21권3호
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• pp.7-11
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• 1983

A measurable function f defined on a measurable subset A of the real line R is called pth power summable on A if │f│$^{p}$ is integrable on A and the set of all pth power summable functions on A is denoted by L$^{p}$ (A). For each member f in L$^{p}$ (A), we define ∥f∥$_{p}$ =(equation omitted) For real numbers p and q where (equation omitted) and (equation omitted), we discuss the Holder's inequality ∥fg∥$_1$<∥f∥$_{p}$ ∥g∥$_{q}$ , f$\in$L$^{p}$ (A), g$\in$L$^{q}$ (A) and the Minkowski inequality ∥＋g∥$_{p}$ <∥f∥$_{p}$ ＋∥g∥$_{p}$ , f,g$\in$L$^{p}$ (A). In this paper also discuss that L$_{p}$ (A) becomes a metric space with the metric $\rho$ : L$^{p}$ (A) $\times$L$^{p}$ (A) longrightarrow R where $\rho$(f,g)=∥f-g∥$_{p}$ , f,g$\in$L$^{p}$ (A). Then, in this paper prove the Riesz-Fischer theorem, i.e., the space L$^{p}$ (A) is complete and that the space L$^{p}$ (A) is separable.

• 대순사상논총
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• 제23권
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• pp.153-192
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• 2014

This article's purpose is to overcome the inadequacy of deliberative democracy for communication on the basis of Haewonsangsaeng. The inadequacy of deliberative democracy for communication is presented as the following two. First, as deliberative democracy treats civic virtue as instrumental thing, deliberative democracy is still in moral solipsism. Second, as deliberative democracy doesn't consider 'the inequality of power' among diverse political positions, the project of deliberative democracy for communication ends up in the exposure of the inequality of power among diverse political positions. Sangsaeng in Haewonsangsaeng concerned with inter-relationship over individualism treats civic virtue as original motility. In this context, Sangsaeng in Haewonsangsaeng is the alternative notion to overcome the first inadequacy of deliberative democracy for communication. Haewon in Haewonsangsaengas is the condition for Sangsaeng. and Haewon's method is to exclude or to eliminate the structural frame of Sanggeuk meaning mutual conflict and antagonism. This article presents two structural frame of Sanggeuk. First, First structural obstacle as internal obstacle is suggested through analyzing pluralism on the basis of existential philosophy. The result of the analysis is the 'antagonism' between the hegemonical value and the peripheral value. Second structural obstacle as external obstacle is the extinction of public sphere caused by the growth of market and the expansion of bureaucracy.

• 한국사회정책
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• 제25권2호
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• pp.31-55
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• 2018

돌봄의 경제적 불이익과 성불평등은 서로를 강화한다. 성불평등의 기저에 돌봄의 불평등한 분배와 대우가 자리하고 있다. 돌봄은 성불평등을 심화시키는 경제적 불이익을 초래한다. 돌봄을 수행하는 자는 사회경제적 권력 관계에서 보통 약자의 위치를 점하고 있으며, 사회경제적 약자가 수행하는 돌봄은 그 수행에 대한 공정한 대우와 보상의 목소리를 내기가 어렵다. 그 결과 낮은 경제적 가치를 갖게 된 돌봄을 수행하는 자는 더욱 취약한 사회경제적 지위와 권력 관계에 놓여 불평등한 성별 관계를 지속시킨다. 기본소득 제도는 성불평등을 완화할 수 있는 잠재적 가능성을 지니고 있지만, 돌봄 노동의 특수한 성격이 야기하는 경제적 불이익은 그러한 잠재적 가능성을 희석시킬 수 있다. 기본소득 제도가 여성의 실질적 자유를 실현하기 위해서는 돌봄의 경제적 불이익에 대한 천착과 적극적 개입이 필요하다. 본 논문은 기본소득 지지론자들의 돌봄 노동에 대한 관점을 검토하고, 돌봄노동의 고유한 특성으로 인한 돌봄불이익이 완화 혹은 해소되지 않는다면 기본소득이 도입되어도 돌봄 노동 선택의 성별화를 변화시키는 데 한계가 있다고 주장한다.

• 영어어문교육
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• 제15권3호
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• pp.59-81
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• 2009

The primary goal of this paper was to develop a critical point of view to critical pedagogy when applied to EFL contexts. Critical pedagogy is more concerned about how language can affect personal and social change of teachers and students than it is with how to teach language effectively or in ways that encourage critical thinking on the part of teacher and students. For this goal, this paper introduces the definition, emergence and major constructs of critical pedagogy in a broad way at first. Then, this paper presents how critical pedagogy has an impact on ELT, focusing on how critical pedagogy is applied in ELT contexts and why the application of critical pedagogy in EFL can be criticized, through the review of empirical studies. Reflection of Korean English teaching situation and applicational difficulties of critical pedagogy in Korean ELT are followed.