A Comparative Study of Bootstrapping Techniques for Inventory Control
- Authors: Frederick, Lauren
- Date: 2020
- Subjects: Computer bootstrapping -- Inventory control
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/48335 , vital:40849
- Description: Setting correct inventory levels is an important business consideration in order to minimise inventory investment while at the same time ensuring sufficient inventory levels to meet customer demand. Inventory management has a significant impact on both financial and customer service aspects of a business. Selecting appropriate inventory levels requires that products’ lead time demand be accurately estimated in order to calculate the reorder point. The purpose of this study was to empirically determine whether bootstrapping methods used to estimate the lead time demand distribution and reorder point calculation could match or even outperform a standard parametric approach. The two bootstrapping methods compared in this research included variations of those presented by Bookbinder and Lordahl [1989] and do Rego and de Mesquita [2015]. These were compared to the standard parametric approach common in practice which makes use of the Normal distribution for modelling lead time demand. The three reorder point calculation methods were each incorporated into the inventory policy simulations using data supplied by a South African automotive spare parts business. The simulations covered a period of twelve months and were repeated for multiple service levels ranging from 70 to 99 percent. Results of the simulations were compared at a high level as well as for groups of items identified using segmentation techniques which considered different item demand and lead time characteristics. Key findings were that the Normal approximation method was far superior in terms of the service level metric, while the variation of the Bookbinder and Lordahl [1989] method adopted in this study presented possible cost benefits at lower service levels.
- Full Text:
- Date Issued: 2020
- Authors: Frederick, Lauren
- Date: 2020
- Subjects: Computer bootstrapping -- Inventory control
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/48335 , vital:40849
- Description: Setting correct inventory levels is an important business consideration in order to minimise inventory investment while at the same time ensuring sufficient inventory levels to meet customer demand. Inventory management has a significant impact on both financial and customer service aspects of a business. Selecting appropriate inventory levels requires that products’ lead time demand be accurately estimated in order to calculate the reorder point. The purpose of this study was to empirically determine whether bootstrapping methods used to estimate the lead time demand distribution and reorder point calculation could match or even outperform a standard parametric approach. The two bootstrapping methods compared in this research included variations of those presented by Bookbinder and Lordahl [1989] and do Rego and de Mesquita [2015]. These were compared to the standard parametric approach common in practice which makes use of the Normal distribution for modelling lead time demand. The three reorder point calculation methods were each incorporated into the inventory policy simulations using data supplied by a South African automotive spare parts business. The simulations covered a period of twelve months and were repeated for multiple service levels ranging from 70 to 99 percent. Results of the simulations were compared at a high level as well as for groups of items identified using segmentation techniques which considered different item demand and lead time characteristics. Key findings were that the Normal approximation method was far superior in terms of the service level metric, while the variation of the Bookbinder and Lordahl [1989] method adopted in this study presented possible cost benefits at lower service levels.
- Full Text:
- Date Issued: 2020
The prevalence of overweight and obesity of six to nine year old black African children in a rural town of Mpumalanga
- Authors: Bezuidenhout, Hanlie Pearl
- Date: 2012
- Subjects: Obesity in children -- South Africa -- Mpumalanga , Overweight children -- South Africa -- Mpumalanga , Obesity in children -- Prevention
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:10090 , http://hdl.handle.net/10948/1602 , Obesity in children -- South Africa -- Mpumalanga , Overweight children -- South Africa -- Mpumalanga , Obesity in children -- Prevention
- Description: The aim of the study was to determine the Body Mass Index with regards to overweight and obesity of Black African children between the ages of six and nine years who were enrolled in three rural public schools within Mpumalanga Province, South Africa. The researcher used a quantitative descriptive research design. Each child’s weight and height was measured and their BMI and BMI percentile for gender and age calculated. According to the BMI percentile calculations for gender and age for the sample which consisted of 902 children, three percent were defined as being underweight, 79 percent as being normal weight, 11 percent as being overweight, and seven percent as being obese. In the sample there were also 21.3 percent children who were at risk of becoming overweight (3.5 percent) and obese (17.8 percent). Without intervention these at risk learners may in their adolescent and adult years be adversely affected by the physiological and psychosocial consequences related to their condition. Suggestion is made to utilise a Forum through which various stakeholders can pool their expertise and resources to develop a programme of intervention with the aim to prevent escalation of overweight and obesity, as well as reversing the current prevalence as identified within the research population.
- Full Text:
- Date Issued: 2012
- Authors: Bezuidenhout, Hanlie Pearl
- Date: 2012
- Subjects: Obesity in children -- South Africa -- Mpumalanga , Overweight children -- South Africa -- Mpumalanga , Obesity in children -- Prevention
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:10090 , http://hdl.handle.net/10948/1602 , Obesity in children -- South Africa -- Mpumalanga , Overweight children -- South Africa -- Mpumalanga , Obesity in children -- Prevention
- Description: The aim of the study was to determine the Body Mass Index with regards to overweight and obesity of Black African children between the ages of six and nine years who were enrolled in three rural public schools within Mpumalanga Province, South Africa. The researcher used a quantitative descriptive research design. Each child’s weight and height was measured and their BMI and BMI percentile for gender and age calculated. According to the BMI percentile calculations for gender and age for the sample which consisted of 902 children, three percent were defined as being underweight, 79 percent as being normal weight, 11 percent as being overweight, and seven percent as being obese. In the sample there were also 21.3 percent children who were at risk of becoming overweight (3.5 percent) and obese (17.8 percent). Without intervention these at risk learners may in their adolescent and adult years be adversely affected by the physiological and psychosocial consequences related to their condition. Suggestion is made to utilise a Forum through which various stakeholders can pool their expertise and resources to develop a programme of intervention with the aim to prevent escalation of overweight and obesity, as well as reversing the current prevalence as identified within the research population.
- Full Text:
- Date Issued: 2012
Interactivity in online journalism: a case study of the interactive nature of Nigeria's online Guardian
- Authors: Folayan, Oluseyi Olukemi
- Date: 2004
- Subjects: Guardian (Nigeria) Online journalism Electronic publishing -- Nigeria Electronic newspapers -- Nigeria Electronic news gathering -- Nigeria Nigeria -- Newspapers
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: vital:3429 , http://hdl.handle.net/10962/d1002883
- Description: Interactivity is a distinguishing feature of the online environment but online newspapers have been slow in recognising interactivity as an essential condition of effective Web communication. Existing research show online newspapers generally offer few and token interactive options. This research explored interactivity in online journalism using Nigeria's online Guardian as a case study exploring the nature, levels and utilisation of interactivity and interactive features on the site. This study found that few interactive options are offered in Nigeria's online Guardian and those interactive options on offer just produced an illusion of interactivity; it was apparent that little effort was made to give interactive options on the site the significant attention they deserve. The study highlighted the difference between the availability and use of interactive features on an online newspaper site: the mere presence of such features does not necessarily speak to the levels or nature of interactivity on the site. The difficulty in obtaining findings for the qualitative aspect of this study spoke significantly to the findings in light of the fact that these were attempts using interactive options provided by the newspaper site. They stress what relevant literature highlights: the mere presence of interactive features is not in itself interactivity . Factors contributing to the low levels of interactivity in Nigeria's online Guardian include lack of technical expertise plus human and financial resources and the persistence of a mindset that hinders the development and integration of new information communication technologies and interactivity in online journalism. Theoretically, the possibilities are vast but the likelihood of translating theory into reality appears slim. For Nigeria's online Guardian to become interactive in a participatory way, it must undergo changes and choices about values, goals and standards. There must be a shift in attitudes and approaches towards news-content production and delivery as well as the problematic commercial aspects of electronic publishing routines and the effect of such choices on management and newsroom organisation.
- Full Text:
- Date Issued: 2004
- Authors: Folayan, Oluseyi Olukemi
- Date: 2004
- Subjects: Guardian (Nigeria) Online journalism Electronic publishing -- Nigeria Electronic newspapers -- Nigeria Electronic news gathering -- Nigeria Nigeria -- Newspapers
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: vital:3429 , http://hdl.handle.net/10962/d1002883
- Description: Interactivity is a distinguishing feature of the online environment but online newspapers have been slow in recognising interactivity as an essential condition of effective Web communication. Existing research show online newspapers generally offer few and token interactive options. This research explored interactivity in online journalism using Nigeria's online Guardian as a case study exploring the nature, levels and utilisation of interactivity and interactive features on the site. This study found that few interactive options are offered in Nigeria's online Guardian and those interactive options on offer just produced an illusion of interactivity; it was apparent that little effort was made to give interactive options on the site the significant attention they deserve. The study highlighted the difference between the availability and use of interactive features on an online newspaper site: the mere presence of such features does not necessarily speak to the levels or nature of interactivity on the site. The difficulty in obtaining findings for the qualitative aspect of this study spoke significantly to the findings in light of the fact that these were attempts using interactive options provided by the newspaper site. They stress what relevant literature highlights: the mere presence of interactive features is not in itself interactivity . Factors contributing to the low levels of interactivity in Nigeria's online Guardian include lack of technical expertise plus human and financial resources and the persistence of a mindset that hinders the development and integration of new information communication technologies and interactivity in online journalism. Theoretically, the possibilities are vast but the likelihood of translating theory into reality appears slim. For Nigeria's online Guardian to become interactive in a participatory way, it must undergo changes and choices about values, goals and standards. There must be a shift in attitudes and approaches towards news-content production and delivery as well as the problematic commercial aspects of electronic publishing routines and the effect of such choices on management and newsroom organisation.
- Full Text:
- Date Issued: 2004
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