Implementation Aspects of an Object-Oriented DBMS

1 Introduction This paper describes the design and implementation of an OODBMS, namely the METU Object-Oriented DBMS (MOOD). MOOD [Dog 94b] is developed on the Exodus Storage Manager (ESM) [ESM 92] and therefore some of the kernel functions like storage management, concurrency control, backup and recovery of data were readily available through ESM. In addition ESM has a client-server architecture and each MOOD process is a client application in ESM. The kernel functions provided by MOOD are the optimization and interpretation of SQL statements, dynamic linking of functions, and catalog management. SQL statements are interpreted whereas functions (which have been previously compiled with C ) within SQL statements are dynamically linked and executed. A query optimizer is implemented by using the Volcano Query Optimizer Generator. A graphical user interface, namely MoodView [Arp 93a, Arp 93b], is developed using Motif. MoodView displays both the schema information and the query results ..

Smoking prevalence and related factors among workers of Bornova Municipality in Izmir, Turkey

Aim and objective The aim of this study was to determine the prevalence of smoking and factors related to smokingamong the workers of a district municipality in Izmir. Methods The study consists of a secondary analysis of data collected during a cross-sectional survey on physical activity among municipal workers. Ethical approval and permission from Bornova Municipality were obtained. The data were collected during August-November 2016. Among a total of 2137 municipal workers, the sample size was determined as 352 workers according to 33% prevalence of physical activity (Turkey Nutrition and Health Survey 2010), 5%error, 95% confidence interval, 20% non-response 352. The response rate of the survey was 81.53%. Results The mean age of the participants was 38,91±8,49. Among the study participants, 36.2% were female and 68.3% were married. Among them, 24.0% were graduated from secondary school or lower, 32.1% from high school and 43.9% from university. The mean income per capita of workers was 1676.43 ± 1078.16 TL. Their mean duration of employment at the municipality was 9.55±7.30 years and they worked 171.71±10,91 hours per months, 80.5% were physically active, 36.2% had a disease diagnosed by a doctor and 27.5% were on medication. The prevalence of smoking was 48.8% among these municipal workers. There was no significant difference between the ages (p=0.138) and gender of smokers and non-smokers.Among women, 49.0% were smoking and 48.6% among men (p=0.947). There was a significant difference of smoking prevalence according to education (p=0.006), with 58.0% among secondary school or lower, 56.5% among high school and 38.1% among university graduates (42.9% among women and 32.1% among men). There was no significant difference in the marital status (p=0.242), duration of employment at the municipality (p=0.477), physically active work (p=0.297), monthly working hours (p=0.754), presence of a chronic disease (p=0.755), medication (p=0.887), presence of hobby (p=0.898), body mass index (p=0.123), income per capita (p=0.395) and physical activity level (p=0.695) among smokers and non-smokers. Conclusions The prevalence of smoking is much higher among municipal workers compared to national adult survey data (27% overall, 41.4% among men and 13.1% among women), with a much higher prevalence among women. The reasons underlying this high prevalence, especially some possible local or workplace-related dynamics, should be investigated. The lower prevalence among university graduates is consistent with the literature. Educational interventions could be offered

AN ELECTRONIC MARKETPLACE ARCHITECTURE

In this paper, we describe a scenario for a distributed marketplace whose scope can be the whole Web where resource discovery agents find out about resources that may want to join the marketplace and electronic commerce is realised through buying agents representing the customers and the selling agents representing the resources like electronic catalogs. The marketplace contains an Intelligent Directory Service (IDS) which makes it possible for agents to find out about each other and also contains references to the related Document Type Definitions (DTDs). We propose a possible architecture to support this scenario which is based on the emerging technologies and standards. In this architecture, the resources expose their metadata using Resource Description Framework (RDF) to be accessed by the resource discovery agents and their content through Extensible Markup Language (XML) to be accessed by the selling agents by using Document Object Model (DOM). The IDS contains the template workflows for buying and selling agents, a trader mechanism, Resource Discovery Agents, Document Type Definitions (DTDs) and a dictionary of synonyms to be used by the buying agents to help the customer to specify the item s/he wishes to purchase. The agents and IDS communicate through KQML messages. The modifications necessary to the proposed architecture considering only the available technology are also discussed

METU-EMar: An agentbased electronic marketplace on the web

Abstract. In this paper, we describe a scenario for a distributed marketplace on the Web where resource discovery agents find out about resources that may want to join the marketplace and electronic commerce is realized through buying agents representing the customers and the selling agents representing the resources like electronic catalogs. We propose a possible architecture which is based on the emerging technologies and standards. In this architecture, the resources expose their metadata using Resource Description Framework (RDF) to be accessed by the resource discovery agents and their content through Extensible Markup Language (XML) to be accessed by the selling agents by using Document Object Model (DOM). The marketplace contains Document Type Definitions (DTDs) and a dictionary of synonyms to be used by the buying agents to help the customer to specify the item s/he wishes to purchase. Distribution infrastructure is CORBA and Web on which the buying and selling agents find out about each other using Trading Object Services. The modifications necessary to the proposed architecture considering only the available technology are also discussed.