ORiON最新文献_第3页

Vehicle routing decision support for a local retailer 本地零售商的车辆路线决策支持

ORiON Pub Date : 2021-06-01 DOI: 10.5784/37-1-691

J. V. Vuuren, Aaron Shuttleworth

{"title":"Vehicle routing decision support for a local retailer","authors":"J. V. Vuuren, Aaron Shuttleworth","doi":"10.5784/37-1-691","DOIUrl":"https://doi.org/10.5784/37-1-691","url":null,"abstract":"One of the most challenging decisions that has to made routinely by dispatch managers at distribution centres of warehousing and distribution businesses in the retail sector involves the assignment of delivery vehicles to service customers exhibiting demand for retail goods and the subsequent routing of these delivery vehicles to the various customers and back again. Perhaps surprisingly, these dispatch managers do not always use vehicle routing software to schedule goods deliveries to customers, instead often relying on teams of human schedulers who perform this task manually. The reason for not using such software is usually a perception that it may be difficult to integrate the software with existing enterprise resource planning systems already in use. In such cases, estimates of potential costs savings that may be brought about by such software is often required before the dispatch department will risk the significant step towards investing in vehicle routing planning software. Dispatch managers may then employ these cost savings estimates in cost-benefit trade-off analyses. This paper contains a practical case study in which the potential cost savings of a vehicle routing optimisation approach are quantified for a large retail distribution centre in the South African Western Cape in a bid to support its decision as to whether or not to invest in vehicle routing planning software.","PeriodicalId":30587,"journal":{"name":"ORiON","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81732881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Estimating net ideal cycle time for body-in-white production lines 估算白车身生产线的净理想周期时间

ORiON Pub Date : 2021-06-01 DOI: 10.5784/37-1-683

W. Grobler, D. Kotzé, J. Joubert

引用次数: 1

An overview of survival analysis with an application in the credit risk environment 概述生存分析及其在信用风险环境中的应用

ORiON Pub Date : 2021-02-01 DOI: 10.5784/36-2-690

M. Smuts, J. Allison

引用次数: 3

A machine learning approach for automated strip packing algorithm selection 一种基于机器学习的条带自动包装算法选择方法

ORiON Pub Date : 2021-02-01 DOI: 10.5784/36-2-686

Rosephine G. Rakotonirainy

引用次数: 3

Solving the buffer allocation problem using simulation-based optimisation 使用基于模拟的优化解决缓冲区分配问题

ORiON Pub Date : 2021-02-01 DOI: 10.5784/36-2-684

J. Joubert, D. Kotzé

引用次数: 1

On testing the hypothesis of population stability for credit risk scorecards 信用风险记分卡的人口稳定性假设检验

ORiON Pub Date : 2020-08-31 DOI: 10.5784/36-1-678

J. D. Pisanie, I. Visagie

{"title":"On testing the hypothesis of population stability for credit risk scorecards","authors":"J. D. Pisanie, I. Visagie","doi":"10.5784/36-1-678","DOIUrl":"https://doi.org/10.5784/36-1-678","url":null,"abstract":"Scorecards are models used in credit risk modelling. These models segments a population into various so-called risk buckets\" based on the risk characteristics of the individual clients. Once a scorecard has been developed, the credit provider typically prefers to keep this model in use for an extended period. As a result, it is important to test whether or not the model still ts the population. To this end, the hypothesis of population stability is tested; this hypothesis speci es that the current proportions of the population in the various risk buckets are the same as was the case at the point in time at which the scorecard was developed. In practice, this assumption is usually tested using a measure known as the population stability index (which corresponds to the asymmetric Kullback-Leibler discrepancy between discrete distributions) together with a well-known rule of thumb. This paper considers the statistical motivation for the use of the population stability index. Numerical examples are provided in order to demonstrate the e\u000bect of the rule of thumb as well as other critical values. Although previous numerical studies relating to this statistic are available, the sample sizes are not realistic for the South African credit market. The paper demonstrates that the population stability index has little statisticalmerit as either a goodness-of- t statistic to test the hypothesis of population stability or as an intuitive discrepancy measure. As a result, a novel methodology for testing the mentioned hypothesis is proposed. This methodology includes a restatement of the hypothesis to specify a range of acceptable\" deviations from the speci ed model. An alternative test statistic is also employed as discrepancy measure; this measure has the advantage of having a simple heuristic interpretation in the context of credit risk modelling. \u0000Key words: Goodness-of- t testing, hypothesis testing, population stability, risk analysis.","PeriodicalId":30587,"journal":{"name":"ORiON","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78480034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Sentiment analysis of unstructured customer feedback for a retail bank 某零售银行非结构化客户反馈的情感分析

ORiON Pub Date : 2020-08-31 DOI: 10.5784/36-1-668

J. Kazmaier, JH van Vuuren

{"title":"Sentiment analysis of unstructured customer feedback for a retail bank","authors":"J. Kazmaier, JH van Vuuren","doi":"10.5784/36-1-668","DOIUrl":"https://doi.org/10.5784/36-1-668","url":null,"abstract":"With the explosive growth of the Internet and social media, the communication model between an organisation and its customers has become increasingly complex. A problem arises due to the sheer volume of unstructured data that has to be processed for the purposes of studying and addressing customer feedback. This calls for the development of automated methods. Important objectives of such methods include the detection of the underlying sentiment of customer feedback, as well as the synthesis and presentation of this sentiment in meaningful clusters such as topics and geographical locations. In this paper, a case study is conducted in which unstructured customer reviews related to products and services of a South African retail bank are evaluated by means of sentiment analysis. After suitable preprocessing techniques are applied to the reviews, the process of developing suitable models (primarily within the realm of machine learning) for detecting sentiment with a high level of performanceis described. Subsequently, model results are analysed, synthesised and visualised in order to extract valuable insight from the data. The ndings of the study show that custom learning-based models signi cantly outperform both pre-trained and commercial tools in sentiment classi cation. Furthermore, the analysis approach is shown to yield actionable information that may inform decision making. \u0000Key words: Data mining, decision support systems, neural networks, sentiment analysis.","PeriodicalId":30587,"journal":{"name":"ORiON","volume":"107 1","pages":"35-71"},"PeriodicalIF":0.0,"publicationDate":"2020-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80808697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

GARCH option pricing models in a South African equity context 南非股票背景下GARCH期权定价模型

ORiON Pub Date : 2020-08-31 DOI: 10.5784/36-1-676

PJ Venter, E. Maré

引用次数: 0

Editorial to Volume 36(1) 第36卷(1)社论

ORiON Pub Date : 2020-08-31 DOI: 10.5784/36-1-687

S. Terblanche

引用次数: 0

Considering fairness in the load shedding scheduling problem 考虑公平性的减载调度问题

ORiON Pub Date : 2019-12-20 DOI: 10.5784/35-2-648

RG Rakotonirainy, I. Durbach, J. Nyirenda

{"title":"Considering fairness in the load shedding scheduling problem","authors":"RG Rakotonirainy, I. Durbach, J. Nyirenda","doi":"10.5784/35-2-648","DOIUrl":"https://doi.org/10.5784/35-2-648","url":null,"abstract":"Every day national power system networks provide thousands of MW of electric power from generating units to consumers, requiring different operations and planning to ensure secure systems. Where demand exceeds supply, load shedding - controlled, enforced reduction in supply - is necessary to prevent system collapse. Should load shedding need to be implemented, a planned schedule is necessary to allocate geographic areas on the required period of shedding. The problem of how to construct a schedule that fairly allocates load shedding responsibilities over geographic areas with minimum economic impacts is addressed in this paper. Two programming models are proposed. The first model consists of a linear integer programming model in which the objective is to minimise the economic cost subject to different fairness allocation constraints, while the second model involves formulation of the problem as a goal programming model in which different conflicting goals are simultaneously optimised. Several case studies are conducted in the context of a realistic, but hypothetical, scenario to explore the possible solutions that the proposed models provide. Results show that a fair schedule requires a high cost whereas lower cost can only be achieved with some sacrifices to the fairness of the schedule.","PeriodicalId":30587,"journal":{"name":"ORiON","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87710488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0