Encouraging the implication of shops in the city by means of retail associationism. The case of Bilbao

[EN] Retail activity in urban areas constitutes a key variable in the health of a city. For that reason, the processes of urban revitalization and retail revitalization run in parallel manner. Integrated management models for urban centres constitute a good framework to harness the competitiveness of the cities and their retail businesses, but they require of all implied participation, by means of a public – private cooperation.

One-stop Aqua Shops (OAS)

(4pp.)

Scheduling batches with sequential job processing for two-machine flow and open shops

In this paper, we study a problem of scheduling and batching on two machines in a flow-shop and open-shop environment. Each machine processes operations in batches, and the processing time of a batch is the sum of the processing times of the operations in that batch. A setup time, which depends only on the machine, is required before a batch is processed on a machine, and all jobs in a batch remain at the machine until the entire batch is processed. The aim is to make batching and sequencing decisions, which specify a partition of the jobs into batches on each machine, and a processing order of the batches on each machine, respectively, so that the makespan is minimized. The flow-shop problem is shown to be strongly NP-hard. We demonstrate that there is an optimal solution with the same batches on the two machines; we refer to these as consistent batches. A heuristic is developed that selects the best schedule among several with one, two, or three consistent batches, and is shown to have a worst-case performance ratio of 4/3. For the open-shop, we show that the problem is NP-hard in the ordinary sense. By proving the existence of an optimal solution with one, two or three consistent batches, a close relationship is established with the problem of scheduling two or three identical parallel machines to minimize the makespan. This allows a pseudo-polynomial algorithm to be derived, and various heuristic methods to be suggested.

Taxis, bares, sex-shops y farmacias.

Análisis del concepto de distancia dentro de una ciudad. Se propone que el cálculo de esta magnitud tenga en cuenta, tanto la disposición de los edificios, como el sentido de las calles. Así se calculan diferentes tipos de distancias como el espacio recorrido por los taxistas. También se plantea la separación que debe existir entre establecimientos similares. Por un lado aquellos dedicados al ocio como los bingos o los sex-shops, y por otro lado la normativa existente en la distancia mínima que ha de separar a las farmacias.

Shops, stalls, stores: pre-consumption deposits and centrally organised distribution in Antonine Britain

Michael Fulford writes: Recent research is shedding more light on how certain goods, particularly durable materials like pottery, were distributed in the Western provinces of the Roman Empire and on the steps which connected producer with consumer.15 This paper develops the theme further by exploring the contribution to the debate of three British sites with Antonine assemblages of unused pottery and other goods. While interest has previously focused on the samian because of the contribution that it can make to dating, this paper considers the implications of the assemblages as a whole.

Management information systems in job shops : design of interfaces

A study of management information system technology suitable for the job shop environment, highlighting deficiencies in generic software with respect to supplying users the information they actually require. To solve this problem a set of flexible interfaces was developed through the use of object-oriented programming. The methods used were simple enough to be adopted by vendors of any generic MIS application.

Baby boomers' reasons for choosing specific food shops

Purpose – Baby boomers (people born between 1946 and 1964) are approaching retirement and there is concern about their preparation for their future health and wellbeing. Food shopping is likely to play a major role in their future lives. The purpose of this paper is to examine their reasons for choosing to buy food from particular shops and whether demographic characteristics and health status were associated with them.

Design/methodology/approach – A questionnaire survey was conducted among a random sample of 1,037 people aged between 40 and 71 years in Victoria, Australia. Respondents were asked to indicate, from a list, their reasons for choosing to shop at particular food outlets. Regression analysis was used to examine the relationships between respondents' demographics and health status and their reasons for shopping at the food stores.

Findings – Multivariate analysis showed that the reasons the respondents reported in choosing shops fell into four groups: saving, convenience, quality and healthy foods, and user-friendly environment. Saving was negatively related to income, age, level of education and also linked with country of birth, religious affiliation, and marital status. Convenience was negatively associated with age and also related to health status and religious affiliation. Quality/healthy food products were positively related to age but negatively associated with body mass index, and also linked to country of birth. User-friendly environment was negatively associated with income and education and related to gender and religious affiliation.

Originality/value – The paper's results show that stores could provide more information, perhaps as signage, to their recycling and health information facilities, particularly in low socio-economic status areas. Furthermore, the social status and religious associations confirm the view that shopping reflects broad societal affiliations among baby boomers. Shopping centres can be used to provide support for health and environmental sustainability promotions.

Occupational exposure to paint solvents and particulate material in car repair shops

Aims: We evaluated solvents and total particulates exposures in auto body repair shops together with a search of painter's related complaints. Methods: 26 painters exposures were evaluated by pumped personal sampling; solvents were retained in charcoal sorbent tubes and the particulates in PVC filters. Painter's personal habits and their work characteristics were obtained through a questionnaire, applied in a private interview. For the symptoms the Q16 questionnaire was used, added of questions about complaints during the painting. Results: High exposures were detected during spray painting. For solvents, the TLV-STEL adjusted for the mixtures was surpassed in six evaluations. However, as repaint is a short-term operation, it makes the average concentrations weighed for the work shift lower than the TLV-TWA adjusted for the mixtures. Total particulate concentrations had surpassed the TLV-TWA in four of the evaluations. Symptoms frequency in the Q16 questionnaire was higher for painters than for the controls (Mann-Whitney test U=193; p=0.008), and they showed positive correlations with the age (Spearman r=0.354, t=1.85, p=0.076), the number of years in the profession (Spearman r=0.433, t=2.35, p=0.027) and the alcoholic beverage consumption (Spearman r=0.457, t=2.516, p=0.019). Conclusions: The painting work done at car repair shops can result in high solvent and particulate exposures, although they are short-term operations. Their acute and chronic effects for the painters do not have been clearly evidenced in the present study, continuing deserving multidisciplinary attention.

Asynchronous teams for joint lot-sizing and scheduling problem in flow shops

The integrated production scheduling and lot-sizing problem in a flow shop environment consists of establishing production lot sizes and allocating machines to process them within a planning horizon in a production line with machines arranged in series. The problem considers that demands must be met without backlogging, the capacity of the machines must be respected, and machine setups are sequence-dependent and preserved between periods of the planning horizon. The objective is to determine a production schedule to minimise the setup, production and inventory costs. A mathematical model from the literature is presented, as well as procedures for obtaining feasible solutions. However, some of the procedures have difficulty in obtaining feasible solutions for large-sized problem instances. In addition, we address the problem using different versions of the Asynchronous Team (A-Team) approach. The procedures were compared with literature heuristics based on Mixed Integer Programming. The proposed A-Team procedures outperformed the literature heuristics, especially for large instances. The developed methodologies and the results obtained are presented.