A version of the Davis-Kahan Tan 2Θ theorem [SIAM J. Numer. Anal. 7 (1970), 1 – 46] for not necessarily semibounded linear operators defined by quadratic forms is proven. This theorem generalizes a recent result by Motovilov and Selin [Integr. Equat. Oper. Theory 56 (2006), 511 – 542].

This short communication complements the DEA model proposed by Lovell and Pastor (Eur. J. Oper. Res. 118 (1999), 46-51), by incorporating both positive and negative criteria in the model. As such, we propose a DEA model, known as pure DEA, using a directional distance function approach.

Evolutionary Algorithms are a common probabilistic optimization method based on the model of natural evolution One important oper ator in these algorithms is the selection scheme for which in this paper a new description model based on tness distributions is introduced blickle tik ee ethz ch y thiele tik ee ethz ch

The “separable” uncertainty sets have beenwidely used in robust portfolio selection models [e.g., see Erdoğan et al. (Robust portfolio management. manuscript, Department of Industrial Engineering and Operations Research, Columbia University, New York, 2004), Goldfarb and Iyengar (Math Oper Res 28:1–38, 2003), Tütüncü and Koenig (Ann Oper Res 132:157–187, 2004)]. For these uncertainty sets, each...

Penelitian ini bertujuan untuk mengetahui dan menganalisis kebutuhan media pembelajaran pada materi Organ Pernapasan Manusia Hewan menggunakan permaianan ular tangga meningkatkan motivasi belajar siswa kelas V sekolah dasar. Jenis penelitian adalah Research and Development (R&D) hanya terfokus teknik analysis yang menjadi dasar melakukan sebuah penelitian. Teknik pengumpulan data non tes ya...

In this short paper we answer a question posed by Chmieliński in [Adv. Oper. Theory 1 (2016), no. 1, 8–14]. Namely, we prove that among normed spaces of dimension greater than two, only inner product spaces admit nonzero linear operators which reverse the Birkhoff orthogonality.

The paper considers the calculation of an effective energy schedule in an islanded microgrid. GridLab-D open source simulation tool is used for simulation of microgrid elements. Matlab environment is used to run an optimization solver. The product GridMat is used as an interface tool between Matlab and GridLab-D. An economic scheduling optimization problem for the considered microgrid is formul...

This paper, proposes a control system for use with microgrid consist of multiple small scale embedded generation networks (SSEG networks) connected to the 33kV distribution network. The proposed controller controls power flow in the gridconnected mode of operation, enables voltage and frequency control when the SSEG networks are islanded, and resynchronizes the SSEG networks with the utility be...