نتایج جستجو برای: second echelon nodes

تعداد نتایج: 738352  

Journal: :iranian journal of nuclear medicine 0
leili zarifmahmoudi nuclear medicine research center, mashhad university of medical sciences, mashhad, iran hossein shabahang endoscopic & minimally invasive research center, mashhad university of medical sciences, mashhad, iran farzaneh shariati nuclear medicine research center, mashhad university of medical sciences, mashhad, iran vahid reza dabbagh kakhki nuclear medicine research center, mashhad university of medical sciences, mashhad, iran mostafa mehrabibahar surgical oncology research center, mashhad university of medical sciences, mashhad, iran roya sadat alavifard nuclear medicine research center, mashhad university of medical sciences, mashhad, iran ali jangjoo

introduction: lymphoscintigraphy is imaging of the lymphatic system and has been integrated into the sentinel node mapping procedures. lymphoscintigraphy usually encompasses early or delayed static images. however, immediate dynamic imaging of the lymphatic basins and tumors has also been used as an adjunct lymphoscintigraphy imaging. the aim of this study was to assess the role of early dynami...

Journal: :Archives of surgery 2005
Timothy M Pawlik Eddie K Abdalla Carlton C Barnett Syed A Ahmad Karen R Cleary Jean-Nicolas Vauthey Jeffrey E Lee Douglas B Evans Peter W T Pisters

HYPOTHESIS The required sample size of a prospective randomized trial comparing standard pancreaticoduodenectomy with pancreaticoduodenectomy plus extended lymphadenectomy for pancreatic adenocarcinoma is prohibitively large, making such a trial infeasible. DESIGN Retrospective cohort study. SETTING Comprehensive cancer center. PATIENTS We identified 158 patients who underwent pancreatico...

Introduction: Lymphoscintigraphy is imaging of the lymphatic system and has been integrated into the sentinel node mapping procedures. Lymphoscintigraphy usually encompasses early or delayed static images. However, immediate dynamic imaging of the lymphatic basins and tumors has also been used as an adjunct lymphoscintigraphy imaging. The aim of this study was ...

2007
C. H. M. van Deurzen R. van Hillegersberg M. G. G. Hobbelink C. A. Seldenrijk R. Koelemij P. J. van Diest

BACKGROUND The need for routine axillary lymph node dissection (ALND) in patients with invasive breast cancer and low-volume sentinel node (SN) involvement is questionable. Accurate prediction of second echelon lymph node involvement could identify those patients most likely to benefit from ALND. METHODS A consecutive series of 317 patients with invasive breast cancer and a tumor positive axi...

Journal: :CoRR 2017
Afshin Oroojlooyjadid Lawrence V. Snyder Martin Takác

In multi-echelon inventory systems the performance of a given node is affected by events that occur at many other nodes and in many other time periods. For example, a supply disruption upstream will have an effect on downstream, customer-facing nodes several periods later as the disruption "cascades" through the system. There is very little research on stock-out prediction in single-echelon sys...

2016
Liu Dongdong Wang Feng

In allusion to such problems as low accuracy and long convergence time in traditional two-echelon vehicle routing optimization algorithm, a Memetic algorithm (QDEMA) based on Q learning theory and differential evolution is proposed in this article to solve above problems. Firstly, it is necessary to research the two-echelon vehicle routing optimization problem and adopt the optimal segmentation...

Journal: :Journal of Advanced Transportation 2022

This research introduces a new variant of the two-echelon vehicle routing problem (2EVRP) called with transshipment nodes and occasional drivers (2EVRP-TN-OD). In addition to city freighters in second-echelon network, set (ODs) is available serve customers. ODs are basis crowd-shipping system which crowds planned trips willing take detours deliver packages exchange for some compensation. To cus...

B. Sivakumar G. Arivarignan M. Rajkumar

We consider a two-echelon single commodity inventory system with one warehouse(supplier) at the higher echelon and one retailer at the lower echelon. The retailer stocks individual items of a commodity and satisfies unit demands which occur according to a Poisson process. The supplier stocks these items in packets and uses these packetsto: (i) satisfy the demands that occur for single packet an...

Journal: :Sustainability 2022

Firms with omni-channel multi-echelon distribution networks (OMDC) integrate all of their sale channels and echelons to achieve an effective matching multi-type orders a shared inventory. However, the high operational cost caused by insufficient use inventory resources unreasonable order allocation restricts sustainable development firms. To this end, joint decisions optimization (IO) (OA) are ...

Journal: :European Journal of Operational Research 2023

• Two-echelon vehicle routing problem with three important real-world extensions. Simultaneous handling of reverse flows, satellite capacities, and timing aspects. Matheuristic solution approach combines different decomposition strategies. New for efficient feasibility testing local-search moves. Last-mile collection delivery services often rely on multi-echelon logistic systems many types prac...

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