Block sourcing plus

Kronecker product approximations for dense block Toeplitz-plus-Hankel matrices

In this paper, we consider the approximation of dense block Toeplitz-plus-Hankel matrices by sums of Kronecker products. We present an algorithm for efficiently computing the matrix approximation that requires the factorization of matrices of much smaller dimension than that of the original. The main results are described for block Toeplitz matrices with Toeplitz-plus-Hankel blocks (BTTHB), but...

Paravertebral Block Plus Thoracic Wall Block versus Paravertebral Block Alone for Analgesia of Modified Radical Mastectomy: A Retrospective Cohort Study

BACKGROUND AND OBJECTIVES Paravertebral block placement was the main anesthetic technique for modified radical mastectomy in our hospital until February 2014, when its combination with blocks targeting the pectoral musculature was initiated. We compared the analgesic effects of paravertebral blocks with or without blocks targeting the pectoral musculature for modified radical mastectomy. METH...

Single sourcing versus dual sourcing under conditions of learning

This paper considers a buyer who has to decide whether to select a single or two sources of supply for a homogeneous product. The production processes of the suppliers are subject to learning effects, which reduce the production costs and increase the production capacities of the suppliers. This, in turn, enables the suppliers to reduce the sales price, which results in lower acquisition costs ...

The Mexico-China Sourcing Game: Teaching Global Dual Sourcing

W describe a three-hour class on global dual sourcing built around a game that demonstrates the challenges in making operational decisions, and transfers recent academic insights to the classroom. Student teams manage a firm with access to a responsive but expensive supply source (Mexico) and a cheap but remote source (China). Each team must determine a sourcing strategy to satisfy random deman...

Sourcing from China