Identifying Redundant Constraints for AC OPF: The Challenges of Local Solutions, Relaxation Tightness, and Approximation Inaccuracy

Author(s):  
Alejandro D. Owen Aquino ◽  
Line A. Roald ◽  
Daniel K. Molzahn
Author(s):  
Ercüment H. Ortaçgil

The pseudogroup of local solutions in Chapter 3 defines another pseudogroup by taking its centralizer inside the diffeomorphism group Diff(M) of a manifold M. These two pseudogroups define a Lie group structure on M.


Nature Food ◽  
2021 ◽  
Author(s):  
Philip M. Haygarth ◽  
Mariana C. Rufino
Keyword(s):  

Urban Science ◽  
2021 ◽  
Vol 5 (1) ◽  
pp. 24
Author(s):  
Gordon F. Mulligan ◽  
John I. Carruthers

This paper examines the joint adjustment of population and employment numbers across America’s metropolitan areas during the period 1990–2015. Current levels of both are estimated, for 10 year periods, using their lagged (own and cross) levels and eight other lagged variables. Population is affected by both human and natural amenities and employment by wages, patents, and other attributes of the workforce. This paper questions the conventional interpretation of the adjustment process by using geographically weighted regression (GWR) instead of standard linear (OLS, 2GLS) regression. Here the various estimates are all local, so the long-run equilibrium solutions for the adjustment process vary over space. Convergence no longer indicates a stable universal solution but instead involves a mix of stable and unstable local solutions. Local sustainability becomes an issue when making projections because employment can quickly lead or lag population in some metropolitan labor markets.


2008 ◽  
Vol 12 (02) ◽  
pp. 233-248
Author(s):  
Margie Parikh

Dilip Roy is a country head at Itsun Heavy Industry (India) Pvt. Ltd. (IHIIPL) in Delhi, India. It is a wholly owned subsidiary of Itsun China, a leading private sector construction equipment company. Dilip graduated as a mechanical engineer with reputed National Science Talent Search Scholarship, started his career as a Graduate Trainee Engineer and became a Vice President in another company before he joined IHIIPL as a country head. Hu, the representative of Itsun China in India was exploring the Indian market and he ended up offering a job to Dilip after a series of interactions concerning the Indian Construction Equipment Industry. This was the first opportunity for Dilip to head an entire company. He knew the industry thoroughly and felt excited that finally his ambition was at the verge of fulfillment. When Dilip joined, IHIPL had yet to be incorporated though some business activities had started. Dilip's time at IHIIPL is dotted with problem after problem. The key problems encountered were confusion about reporting relationships, unresponsive head office with its unilateral decisions, and unprofessional and incompetent colleagues. Dilip had taken steps to address most of the company's problems: developing local solutions, drawing on personal resources, and hiring new staff. The business was growing fast on the back of increasing demand. Subsequently, Dilip realized that he was not considered trustworthy by the head office and was not involved in major decisions. His initial perception about his job and IHIIPL changed. Even though he was later given the certificate of honor with an invitation to attend the award ceremony in China, he left the company. This case is useful for examining the issues of cross-cultural management and leadership.


2013 ◽  
Vol 734-737 ◽  
pp. 2788-2791
Author(s):  
Pin Lu

Two kinds of redundant constraints in mechanism and the application are discussed in this article.The calculation method of degree of freedom are given about two kinds of redundant constraints. The roles of redundant constraint for mechanism s function is analysed.Some questions is noticed in mechanism design.


Sign in / Sign up

Export Citation Format

Share Document