130,819 research outputs found
Performance Approximation and Design of Pick-and-Pass Order Picking Systems
No full textIn this paper, we discuss an approximation method based on G/G/m queuing network modeling using Whitt’s (1983) queuing network analyzer to analyze pick-and-pass order picking systems. The objective of this approximation method is to provide an instrument for obtaining rapid performance estimates (such as order lead time and station utilization) of the order picking system. The pick-and-pass system is decomposed into conveyor pieces and pick stations. Conveyor pieces have a constant processing time, whereas the service times at a pick station depend on the number of order lines in the order to be picked at the station, the storage policy at the station, and the working methods. Our approximation method appears to be sufficiently accurate for practical purposes. It can be used to rapidly evaluate the effects of the storage methods in pick stations, the number of order pickers at stations, the size of pick stations, the arrival process of customer orders, and the impact of batching and splitting orders on system performance.simulation;warehousing;order picking;queuing network;pick-and-pass
Order batching in multi-server pick-and-sort warehouses.
No full textIn many warehouses, customer orders are batched to profit from a reduction in the order picking effort. This reduction has to be offset against an increase in sorting effort. This paper studies the impact of the order batching policy on average customer order throughput time, in warehouses where the picking and sorting functions are executed separately by either a single operator or multiple parallel operators. We present a throughput time estimation model based on Whitt's queuing network approach, assuming that the number of order lines per customer order follows a discrete probability distribution and that the warehouse uses a random storage strategy. We show that the model is adequate in approximating the optimal pick batch size, minimizing average customer order throughput time. Next, we use the model to explore the different factors influencing optimal batch size, the optimal allocation of workers to picking and sorting, and the impact of different order picking strategies such as sort-while-pick (SWP) versus pick-and-sort (PAS)Order batching; Order picking and sorting; Queueing; Warehousing;
Pick-N multiple choice-exams: a comparison of scoring algorithms
No full textTo compare different scoring algorithms for Pick-N multiple correct answer multiple-choice (MC) exams regarding test reliability, student performance, total item discrimination and item difficulty. Data from six 3rd year medical students' end of term exams in internal medicine from 2005 to 2008 at Munich University were analysed (1,255 students, 180 Pick-N items in total). Scoring Algorithms: Each question scored a maximum of one point. We compared: (a) Dichotomous scoring (DS): One point if all true and no wrong answers were chosen. (b) Partial credit algorithm 1 (PS(50)): One point for 100% true answers; 0.5 points for 50% or more true answers; zero points for less than 50% true answers. No point deduction for wrong choices. (c) Partial credit algorithm 2 (PS(1/m)): A fraction of one point depending on the total number of true answers was given for each correct answer identified. No point deduction for wrong choices. Application of partial crediting resulted in psychometric results superior to dichotomous scoring (DS). Algorithms examined resulted in similar psychometric data with PS(50) only slightly exceeding PS(1/m) in higher coefficients of reliability. The Pick-N MC format and its scoring using the PS(50) and PS(1/m) algorithms are suited for undergraduate medical examinations. Partial knowledge should be awarded in Pick-N MC exams
Techniques for secondary analysis: Unfolding analysis of "PICK K/N" and "PICK ANY/N" data
No full textTechniques for secondary analysis: Unfolding analysis of "PICK K/N" and "PICK ANY/N" dat
pick n
No full textpick nFar from the ship, alone, deserted, we found a "nogg- head",,, "wid narr pick o' fat on he.'nogg- head APR. 7 1980Used IUsed INot use
Nachtraglichkeit and apres-coup in the Psychological Scientific Literature: A Systematic Review and Future Perspectives
No full textThe crucial role of Nachträglichkeit/après-coup (N/AC) in psychoanalytic psychology has been afforded lower consideration in the scientific literature than other relevant psychoanalytic constructs. No systematic reviews have been provided on this construct. We aimed at investigating the many facets of the psychoanalytic significance N/AC as addressed in the scientific literature, outlining its potential developments. According to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines, we selected peer-reviewed, indexed articles based on the psychoanalytic concept of N/AC in the scientific literature. The keywords we entered in Pubmed, Web of Science, Scopus, and Psychoanalytic Electronic Publishing (PEP) were: Nachträglichkeit, après-coup, and psych*. Studies published between the 1950s and 2022 were considered. The initial database search yielded 600 results. After duplicates removal, 414 contributions were screened, of which 35 articles met the inclusion criteria. A metasynthesis of the latter revealed that N/AC is crucially involved in four different—albeit partially overlapping—domains, where N/AC respectively features as (a) a metapsychological construct explicative of the retroactive constitution of experience, (b) a cornerstone for the emergence of traumatic psychopathology, (c) a resource of the therapeutic process in clinical settings, and (d) a core facet of meaning-making processes involved in the constitution of memory. As a nonlinear, multidimensional process, N/AC is still recognized as a crucial concept in the scientific literature. Yet, no attempts were found, which investigated the phenomenon from an empirical standpoint. Based on the theoretical cues provided in the selected literature, future explorations of N/AC in terms of meaning-making processes and neuroscientific perspectives are suggested
Pick 'n Pay online shopping
No full textIn the study of online shopping companies, the differences in approach and the aspects of each company which worked and didn‟t work are investigated. Two types of online shopping businesses will be looked at, existing grocery stores offering online shopping as an extra service to customers and new online shopping businesses set up to provide this service only. Schnucks and Colruyt are existing grocery stores which started online shopping as an extra service to customers. Webvan, Fresh Direct, Peapod and Streamline started up as businesses that exclusively sold groceries online.Final year project (BEng)--Stellenbosch University, 2011.ENGLISH ABSTRACT: The topic of this project is online shopping at Pick n Pay. The service is currently
inefficient and needs to be improved. Customers are sometimes left unhappy as they
often do not receive their orders on time or receive the wrong items or items are left out
of the order as they were not available in the store, although the website indicated that
they are. Due to the initial problems, some of the customers who started to use the
service regularly have not become inactive. Pick n Pay now needs to improve this
service in order to win their customers back and turn this into a profitable business.
To remodel the current online shopping model a number of steps have to be taken. In
this report other online shopping companies are investigated to obtain reasons of their
success or failure in order to ensure Pick n Pay avoids making the same mistakes and
adopts a successful approach. An analysis of Pick n Pay‟s only online grocery shopping
competitor in South Africa, Woolworths, is then undertaken.
The current Pick n Pay model is analysed from beginning to end and the objectives of
the new model are identified. Problem areas are then identified and solutions are
provided in order to solve these problems and/or improve the current model.
The focus areas include the website, the selection of stores used for online shopping
orders, in store methods (picking, checkout, etc.), delivery time slots and transportation
methods. Results are then concluded and a new model for the service is provided
pick n
No full textpick nBelieve this is a fishing utensilWithdraw MAR. 8 1980MAR 1977Used IUsed IWithdraw
pick
No full textpick n[My father] and i went [trouting] . . . We trouted all day long and never got a bite ("pick, we say") [sic]JH 8/71DNE-citUsed I and SupUsed INot use
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