This paper introduces the research status of convex quadratic bilevel programming at present firstly. Secondly, it analyzes the problem of convex quadratic bilevel programming models, concepts and properties. On this basis, using the optimality conditions of KKT, the problem will be transformed into a single complementary slackness relaxation problem. To solve this problem, we propose an orthog...

Menopause is a key point moment in the specific aging process of women. It represents a universal evolution in life. Its initiation is defined by a 12-month amenorrhea following the ultimate menstrual period. It encompasses a series of different biologic and physiologic characteristics. This period of life appears to spot a decline in a series of skin functional performances initiating tissue a...

In this article, we discuss an exact algorithm for solving mixed integer concave minimization problems. A piecewise inner-approximation of the function is achieved using auxiliary linear program that leads to a bilevel program, which provides lower bound original problem. The reduced single level formulation with help Karush–Kuhn–Tucker (KKT) conditions. Incorporating KKT conditions lead comple...

Background: In vivo study of the mechanical behavior of tendons may bring advances in evaluating the impact of intervention programs for fl exibility and strength, in clinical practice and sports. Objective: The aim of this study was to quantify the relative strain and slackness of achilles tendons during passive mobilization, for four ankle joint angles and two knee angles. Methods: The displa...

Tone regulation in coronary microvessels has largely been studied in isolated vessels in the absence of myocardial tethering. Here, the potential effect of radial tethering and interstitial space connective tissue (ISCT) between coronary microvessels and the surrounding myocardium was studied. We hypothesized that rigid tethering between microvessels and the myocardium would constrain the activ...

Primal-dualinterior-point methods have proven to be very successful for both linear programming (LP) and, more recently, for semideenite programming (SDP) problems. Many of the techniques that have been so successful for LP have been extended to SDP. In fact, interior point methods are currently the only successful techniques for SDP. We present a new paradigm for deriving these methods: 1) usi...

Apart from scalable classrooms, learning in virtual space for pro-technology and pro-Internet generation contributes significantly to developing their inherent domains. This process manifests through the use of digital materials, making pedagogical scheme enjoyable, catchy, innovative, inclusive. Today’s staggering educational challenges tertiary institutions, because COVID-19 Pandemic, call op...

According to field measurements, the damping ratio of a railway catenary varies along span length and shows an inherent uncertainty. In numerical simulations, it is common assume constant ratio. Herein, methodology proposed include variable in simulations pantograph-catenary interactions. The ratios are extracted from measurement uplifts critical points span, including droppers, steady arm, sti...

This article poses the following problem: Does there exist a probability distribution over subsets of finite partially ordered set (poset), such that constraints involving marginal probabilities poset’s elements and maximal chains is satisfied? We present combinatorial algorithm to positively resolve this question. The can be implemented in polynomial time special case where chain are affine fu...

The wind deflection of overhead contact lines (OCLs) challenges the stable and safe operation electrified railways. steady causes static line, while fluctuating leads to OCL buffeting. This paper performs a response spectrum analysis caused by combined effects winds. Considering initial configuration OCL, an absolute nodal coordinate formulation method is employed model OCL. A spatial field inc...