A flexible approach to short-term hydro-thermal coordination. II. Dual problem solution procedure

1996 ◽  
Vol 11 (3) ◽  
pp. 1572-1578 ◽  
Author(s):  
S. Ruzic ◽  
A. Vuckovic ◽  
N. Rajakovic
Keyword(s):  
Dual Problem ◽  
Solution Procedure ◽  
Problem Solution ◽  
Short Term ◽  
Flexible Approach

scholarly journals VORTEX OPTIMIZATION ALGORITHM FOR SOLVING OPTIMAL REACTIVE POWER DISPATCH PROBLEM

2018 ◽  
Vol 6 (1) ◽  
pp. 266-276
Author(s):  
K. Lenin
Keyword(s):  
Reactive Power ◽  
Solution Space ◽  
Stability Margin ◽  
Solution Procedure ◽  
Problem Solution ◽  
Static Voltage Stability ◽  
Optimal Reactive Power Dispatch ◽  
Voltage Stability Margin ◽  
Vortex Nature ◽  
Power Problem

In this paper, a new Vortex Optimization (VO) algorithm is proposed to solve the reactive power problem. The idea is generally focused on a typical Vortex flow in nature and enthused from some dynamics that are occurred in the sense of Vortex nature. In a few words, the algorithm is also a swarm-oriented evolutional problem solution methodology; since it comprises numerous techniques related to removal of feeble swarm members and trying to progress the solution procedure by supporting the solution space through fresh swarm members. In order to evaluate the performance of the proposed Vortex Optimization (VO) algorithm, it has been tested in Standard IEEE 30 bus systems and compared to other standard algorithms. Simulation results reveal about the best performance of the proposed algorithm in reducing the real power loss and static voltage stability margin index has been enhanced.

scholarly journals Diversifikasi dan Optimasi Usahatani Terintegrasi pada Lahan Kering di Desa Musi Kecamatan Gerokgak Kabupaten Buleleng

2021 ◽  
Vol 9 (2) ◽  
pp. 416
Author(s):  
WISNO WARDANA ◽  
I Wayan Budiasa ◽  
I Ketut Suamba
Keyword(s):  
Linear Programming ◽  
Dual Problem ◽  
Problem Solution ◽  
Gross Margin ◽  
Primal Problem

Tujuan penelitian adalah (1) menganalisis besarnya pendapatan aktual (gross margin) usahatani terintegrasi (2) menganalisis apakah diversifikasi usahatani pada usahatani terintegrasi lahan kering sudah optimal. Metode yang digunakan dalam menentukan sampel pada penilitian ini adalah teknik sensus sample. Teknik sampel ini menggunakan semua anggota SIMANTRI 001 sebagai sampel dengan anggota kelompok sebanyak 20 orang. Analisis pendapatan aktual yang dipergunakan adalah analisis usahatani melalui perhitungan gross margin. Analisis optimasi dan pendapatan maksimun dianalisis menggunakan metode linear programming (LP) yang diselesaikan dengan bantuan software BPLX88. Hasil penelitian menunjukkan bahwa berdasarkan hasil analisis gross margin, dengan rata-rata luas lahan kering sebesar 0,497 ha, diperoleh pendapatan aktual usahatani jagung MT-1, jagung MT-2, kacang tanah dan ternak sapi sebesar Rp. 696.326.650 per tahun. Berdasarkan hasil analisis linear programming yang dilihat dari primal problem solution menunjukkan jagung (PJG1), jagung  (PJG2), kacang tanah (PKT) dan sapi (PSAPI) yang diusahakan bersatus basic atau profitable. Hal ini menunjukkan bahwa lahan seluas 0,497 ha telah berkontribusi dalam memperoleh pendapatan maksimum sebesar Rp. 697.333.800 per tahun. Selanjutnya pada dual problem solution, semua kendala lahan per cabang usahatani dengan luas lahan masing-masing tanaman sebesar 9,95 ha telah habis terpakai, Hal ini menunjukkan bahwa kendala lahan jagung MT-1, jagung MT-2, dan kacang tanah berstatus binding atau habis terpakai tanpa ada sisa (slack). Namun sebagian kendala tidak bersifat binding hal ini terlihat pada stok tenaga kerja bulan Januari-Desember yang belum habis digunakan. Berdasarkan analisis optimasi melalui metode linear programming dengan bantuan BLPXX8 terselenggara dengan optimal, hal ini terbukti dengan pendapatan maksimum sebesar Rp. 697.334.000 artinya mengalami peningakatan pendapatan sebesar Rp.1.007.350 (0,14%), dari pendapataan aktual saat penelitiaan sebesar Rp.696.326.650.

scholarly journals ОПТИМАЛЬНОЕ ПРОЕКТИРОВАНИЕ СТАТИЧЕСКИ ОПРЕДЕЛИМОЙ БАЛКИ ПРИ ОГРАНИЧЕНИИ НА МАКСИМАЛЬНЫЙ ПРОГИБ

2020 ◽  
pp. 28-34
Author(s):  
Сергей Сергеевич Куреннов
Keyword(s):  
Programming Problem ◽  
Cross Section ◽  
Rectangular Cross Section ◽  
Constant Width ◽  
Variable Cross Section ◽  
Solution Procedure ◽  
Linear Functions ◽  
Problem Solution ◽  
Variable Cross ◽  
Nodal Points

Here is solved the optimization problem for the longitudinal depth distribution in the beam with a limitation on the maximum value of deflection. A review of the references is done, and it is shown that the known solutions are either erroneous, because they are based on false hypotheses, or have a narrow field of application, limited only to symmetrical constructions for which the point of the maximum deflection is known a priori. The paper considers a beam of the rectangular cross-section of constant width. The beam is assumed to be statically determinate, and the load is arbitrary and asymmetric and multidirectional as well. The points (or point) of the beam maximum deflections are unknown in advance and would be determined in the problem-solution procedure. A linear problem is considered. The optimization criterion is the mass of the beam. To find the deflections of the beam, i.e. to solve the differential equation of a variable cross-section beam bending the finite difference method is used. The design problem is reduced to the required beam depths obtaining in the system of nodal points. In this case, the desired solution must satisfy the restriction system for the nodal points shift and the sign of variables as well. Since the restrictions of the shift of each node are considered separately and independently, so the proposed method allows flexible control of the beam shift restrictions. Using the change of variables proposed in the paper, the problem to be solved is reduced to a nonlinear programming problem where the criterion function is separable and restrictions are linear functions. Using linearization, this problem can be reduced to the linear programming problem relatively to new variables. The model problem is solved, and it is shown that the proposed algorithm efficiently allows us to solve the problems of the beam optimal design with the restrictions of the maximally allowed deflection. The proposed approach can be spread for the strength limitations, for beams of variable width, I-beam cross-section, etc.

Problem of the Variability of Substitute Thermo-Physical Properties for Heat Transfer Modelling in Iso- and Iso-Exo Porous Materials

2009 ◽  
Vol 283-286 ◽  
pp. 376-381 ◽  
Author(s):  
Zenon Ignaszak ◽  
Paweł Popielarski
Keyword(s):  
Heat Transfer ◽  
Thermal Analysis ◽  
Solution Procedure ◽  
Problem Solution ◽  
Heat Sources ◽  
Inverse Problem Solution ◽  
Thermophysical Parameters ◽  
Transfer Modelling ◽  
Materials Used ◽  
Thermo Physical Properties

In foundry technology the modeling of heat transfer in materials containing exothermic components must take into consideration the presence of heat sources in the Fourier–Kirchhoff equation. The aim of this investigation was the identification of real and effective thermophysical parameters of the insulating and insulating –exothermic materials used as riser sleeves containing these exothermic heat sources. The experiments of liquid steel or cast iron pouring into the mould, containing different insulating and exothermic sleeves were carried out, using thermocouples meas-urement systems (thermal analysis of casting–mould system). Then the thermo-physical coefficients of these materials were calculated using inverse problem solution. The numerical system Calcosoft and its Inverse Solution procedure were applied.

Precarization of Work of Scientific and Pedagogical Staff of Universities: State and Development Trends

2018 ◽  
Vol 6 (6) ◽  
pp. 45-48
Author(s):  
Елена Митрофанова ◽  
Elena Mitrofanova
Keyword(s):  
Higher Education ◽  
Human Capital ◽  
Teaching Staff ◽  
Problem Solution ◽  
Labor Intensity ◽  
Negative Consequences ◽  
Short Term ◽  
Precarious Work ◽  
Higher Education System ◽  
University Teachers

The article is devoted to the problems of precarization of employment of university teachers. The relevance of the topic is conditioned by the fact that this period of economic development of Russia requires special attention to the sphere of higher education, where the basic processes of formation of human capital are taking place. In this regard, the importance of the teaching staff of universities is repeatedly increased. Nevertheless, the ongoing processes, which testify to the precarious work of the teachers, call into question the possibility of realizing the tasks that the higher school of the country faces. Based on the analysis of the employment precariousness signs, the existence of these phenomena in the sphere of higher education is shown, which is manifested by the aggravation of such problems as underemployment, low wages, high labor intensity, and the lack of security of employment in the short term. The specifics of the precarious work of the teachers in terms of negative consequences for the education sector, society as a whole are shown. Based on the results of the analysis, the main directions of this problem solution at all levels of the higher education system are substantiated.

Problems of Heat Source Modeling in Iso–Exothermic Materials Used as Riser Sleeves in Foundry

2006 ◽  
Vol 514-516 ◽  
pp. 1438-1442 ◽  
Author(s):  
Zenon Ignaszak ◽  
Paweł Popielarski
Keyword(s):  
Heat Source ◽  
Source Function ◽  
Exothermic Reaction ◽  
Solution Procedure ◽  
Problem Solution ◽  
Heat Sources ◽  
Source Modeling ◽  
Reaction Heat ◽  
Measurement Systems ◽  
Materials Used

The modeling of heat transfer in materials containing exothermic components must take into consideration the presence of heat sources in the Fourier–Kirchhoff equation. The aim of this investigation was the identification of real and effective thermophysical parameters of the insulating–exothermic materials used as riser sleeves containing these exothermic heat sources. The experiments of steel pouring into the mould, containing different insulating and exothermic sleeves were carried out, using thermocouples measurement systems (thermal analysis of casting–mould system). Then the thermophysical coefficients of these materials were calculated using inverse problem solution. The worked time–dependent formula of exothermic reaction heat (heating yield in W/m3) was called heat source function. The paper presents the basis and the practical expression of heat source by different functions, its justification and the results of simulations using these functions. The numerical system Calcosoft and its Inverse Solution procedure were applied.

The Challenges of Road Preservation Program for Indonesian National Roadway

2016 ◽  
Vol 845 ◽  
pp. 359-363
Author(s):  
Ary Setyawan ◽  
Agus Taufik Mulyono
Keyword(s):  
Problem Solution ◽  
Medium Term ◽  
Short Term ◽  
The Road ◽  
Threat Analysis ◽  
Standard Guideline ◽  
The Government ◽  
National Road ◽  
Government Legislation ◽  
Technical Guidance

The study has been carried out to investigate the implementation of road preservation in the Indonesian National Road. The root of the problems of causes road deterioration are revealed, they consist of four aspects: planning and programming, implementation, maintenance, and operation of the road. The strength, weakness, opportunity and threat analysis were adopted to find the problem solution to overcome the challenges of road preservation in the Indonesian National Road. Some action programs to support the implementation of road preservation are suggested based on the results of strength, weakness, opportunity and threat analysis. In short term action, the government legislation, the technical guidance, the standard guideline and manual need to be provided shortly. Meanwhile, for medium term action, the “performance based contract” must be conducted effectively.

Conceptual short-term memory (CSTM) supports core claims of Christiansen and Chater

2016 ◽  
Vol 39 ◽  
Author(s):  
Mary C. Potter
Keyword(s):  
Working Memory ◽  
Rapid Serial Visual Presentation ◽  
Language Comprehension ◽  
Short Term Memory ◽  
Visual Presentation ◽  
Long Term Memory ◽  
Short Term ◽  
Term Memory ◽  
Use Of Knowledge

AbstractRapid serial visual presentation (RSVP) of words or pictured scenes provides evidence for a large-capacity conceptual short-term memory (CSTM) that momentarily provides rich associated material from long-term memory, permitting rapid chunking (Potter 1993; 2009; 2012). In perception of scenes as well as language comprehension, we make use of knowledge that briefly exceeds the supposed limits of working memory.

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