Knowledge-Based System Explanation: The Ripple-Down Rules Alternative

The ability to provide explanations has been seen as a key feature of expert systems (ES) typically not offered by other types ofcomputer systems. ES need to offer explanations because ofimprecise domains and the use ofheuristics. Verification is not enough. ES need to justify and be accountable. Explanation is seen as an important activity for knowledge-based systems as it satisfies the user's need to decide whether to accept or reject a recommendation. In this paper we review explanation in first-generation and second-generation ES. An alternative is offered to the main approaches which uses multiple classification ripple-down rules and challenges even the goals of explanation. Instead of trying to give explanations which provide a meaningful line of reasoning and which are tailored to suit the individual it may be just as useful to provide the user with sufficient information and browsing tools to develop their own line of reasoning. The type of information that can assist understanding is the context in which the recommendation applies (which is provided through the display ofrelevant cases and exception rule history) and the ability to explore an abstraction hierarchy of the rules using formal concept analysis. An explanation tool kit aimed at putting the user in control is described and evaluated in this paper. Received 15 January 2001 / Revised 21 June 2001 / Accepted in revised form 1 October 2001     

What do adults in Prince Edward Island know about nutrition?

PURPOSE: To assess adults' knowledge of dietary recommendations, food sources of key nutrients, food choices, and diet-disease relationships. METHODS: A previously validated survey, designed to assess nutrition knowledge, was adapted for use in Prince Edward Island and mailed to a random sample of 3,500 adults (aged 18 to 74). Dillman's Total Design Method was followed and a response rate of 26.4% achieved. Mean scores and 95% confidence intervals (CIs) were calculated for the overall survey and for each section. Demographic variations were assessed by univariate analysis. RESULTS: Of an overall possible score of 110 points, the mean score with 95% CI was 71.0 (70.1, 71.9). Respondents scored higher on the sections on dietary recommendations, food sources, and food choices than diet-disease relationships. Demographic differences existed in gender, age, education, and income. Findings suggest that adults have good general knowledge of dietary recommendations, but lack knowledge about how to make healthier food choices and the impact of diet on disease risk. CONCLUSION: When designing intervention strategies, dietitians should consider targeted messages to provide adults with the information they need to make healthy food choices.     

National security,individual privacy and public access to government-held information: the need for changing perspectives in a global environment

Governments are often the largest collectors of data within their jurisdiction, and often that data collection and storage is financially supported with public taxes. How governments manage and make available that information when requested by non-government parties varies by country. As the data-sharing world finds new and multi-platform ways to network, variations in legal access to government-held information create both opportunities and challenges. In this article, recent research is reviewed on problems faced by legal systems trying to navigate conflicts between individual privacy, public access and national state security.     

Effects of medication, behavioral, and combined treatments on parents' and children's attributions for the behavior of children with attention-deficit hyperactivity disorder.

Seventy-four mothers and 41 fathers and their 6 to 13 year old sons with attention-deficit hyperactivity disorder (ADHD) watched videos of child ADHD symptoms, compliance, and noncompliance. Participants were told either that the child was receiving medication, behavioral treatment, a combination of the two, or was not receiving treatment and were asked to rate the cause of the behavior. Parents attributed less control but greater stability to positive child behaviors when the child was receiving medication. However, for negative behaviors, medication increased attributions of control but diminished stability. With behavior management, compliance was seen as more external and stable and noncompliance as more controllable but less stable. For all treatments, boys reported increased control over ADHD symptoms and noncompliance. The implications of these treatment-related attributions for parenting and children's self-perceptions are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The Parenting Sense of Competence scale: Evidence of a stable factor structure and validity.

In this study, 110 mothers and 110 fathers of 5- to 12-yr old boys and girls completed the Parenting Sense of Competence (PSOC) scale and measures of child behaviour, parenting style, and marital satisfaction. The authors replicated the factor structure of the Parenting Sense of Competence Scale, and provided evidence that the Satisfaction and Efficacy scales from this measure assess distinct aspects of parenting self-esteem. Interestingly, parents of girls reported higher Efficacy scores than parents of boys. To address the validity of the PSOC scale, we calculated partial correlations between Efficacy and Satisfaction PSOC scores and other measures of family functioning, controlling for the shared variance between the 2 scales. Significant small-to-moderate size correlations were found between parents' reports of both internalizing and externalizing child problems and Satisfaction scores, but correlations with Efficacy scores were generally small and nonsignificant, particularly for mothers. Mothers and fathers who reported a more easy-going, low-conflict parenting style were more satisfied in parenting; for mothers, a similar relationship was found for parenting efficacy. In addition, Satisfaction scores shared a small but significant amount of variance with mother-father agreements in parenting style, as well as marital satisfaction. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Don’t believe the hype: a grounded exploratory six country wine purchasing study

The purpose of this exploratory study was to understand the extent that consumers report purchasing wine on mobile devices and to empirically examine potential drivers of m-wine purchasing across six countries to guide theoretical research enquiry moving forward. Purposive sampling was employed. An online survey involving 2853 respondents from France, Germany, Greece, Canada, US and South Africa forms the basis for the current study. The results of the study indicate that though mobile phone usage, wine consumption and purchasing rates are high, mobile-wine purchasing prevalence is low within all six countries. While technology hype has us believe an online presence is essential for business revenue growth and performance; the current study indicates wineries should carefully consider consumer readiness towards mobile-wine purchasing. Limitations and recommendations for future research are identified.     

Gains in sensitivity with a device that mixes microarray hybridization solution in a 25-microm-thick chamber

A microarray hybridization system that allows mixing in volumes comparable to those used by glass coverslips is presented. This system is composed of a disposable flexible lid that binds to 1 in. x 3 in. glass slides via an adhesive gasket, forming a uniform 25-microm-thick hybridization chamber. This chamber rests on a base unit for temperature control. The lid contains two air-driven bladders that continuously mix the hybridization fluid. Mixing enhances sensitivity from a typical microarray experiment 2-3-fold. Mixing is particularly effective at high spotted probe and low labeled target concentrations and overcoming local target depletion that occurs when homologous probes are spotted in close proximity. Mixing appears to be compatible with most hybridization conditions; however, mix versus no-mix control experiments should be performed. Also covered are a number of microfluidic issues related to manufacturing, filling, mixing, and packaging.     

Orthographic facilitation and categorical interference in a word-translation variant of the Stroop task.

Examined whether the main characteristics of Stroop-like naming tasks also show up in a word-translation variant of the Stroop Color and Word Test. 14 Dutch university students translated common English words that were preceded or followed by a Dutch distractor word (DW). Results were similar to those obtained with color and picture naming. When the DW followed the target stimulus, an orthographic relation between the DW and the to-be-retrieved response word (RW) facilitated performance compared with an unrelated word. A categorical relation between the DW and the RW hampered performance. This task may be useful in the study of word recognition, name retrieval, and bilinguality. (French abstract) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effect of smoking regulations in local restaurants on smokers' anti-smoking attitudes and quitting behaviours

Objective

To examine the effect of smoking regulations in local restaurants on anti‐smoking attitudes and quitting behaviours among adult smokers.

Design

Hierarchical linear modelling (HLM) was used to assess the relationship between baseline strength of town‐level restaurant smoking regulation and follow‐up (1) perceptions of the social acceptability of smoking and (2) quitting behaviours.

Setting

Each of the 351 Massachusetts towns was classified as having strong (complete smoking ban) or weak (all other and no smoking restrictions) restaurant smoking regulations.

Subjects

1712 adult smokers of Massachusetts aged ⩾18 years at baseline who were interviewed via random‐digit‐dial telephone survey in 2001–2 and followed up 2 years later.

Main outcome measures

Perceived social acceptability of smoking in restaurants and bars, and making a quit attempt and quitting smoking.

Results

Among adult smokers who had made a quit attempt at baseline, living in a town with a strong regulation was associated with a threefold increase in the odds of making a quit attempt at follow‐up (OR = 3.12; 95% CI 1.51 to 6.44). Regulation was found to have no effect on cessation at follow‐up. A notable, although marginal, effect of regulation was observed for perceiving smoking in bars as socially unacceptable only among smokers who reported at baseline that smoking in bars was socially unacceptable.

Conclusions

Although local restaurant smoking regulations did not increase smoking cessation rates, they did increase the likelihood of making a quit attempt among smokers who had previously tried to quit, and seem to reinforce anti‐social smoking norms among smokers who already viewed smoking in bars as socially unacceptable.Despite the proliferation of restaurant and bar smoking ordinances, very little is known about their specific effects on smokers'' attitudes towards smoking in public places and actual quitting behaviours. The effect of clean indoor air ordinances on smokers is of particular interest given that these types of bans may discourage smoking by strengthening anti‐smoking community norms and in turn influencing quitting behaviours. That is, the social unacceptability of smoking in restaurants and bars may be a potential mechanism in reducing smoking behaviours. Glantz has argued that the tobacco industry''s opposition to restaurant and bar smoking bans is primarily due to the strong message that smoking is no longer socially acceptable.⁶ A recent cross‐sectional study showed that strong local restaurant and bar regulations are associated with more negative attitudes towards the social acceptability of smoking in restaurants and bars among adults who eat out or go out primarily in their towns.⁷ It is known that public smoking restrictions limit smokers'' opportunities to smoke, thus raising the costs of smoking (eg, having to go outside to smoke), which may reduce the perceived benefits of this behaviour (eg, social camaraderie and “pleasure” of smoking a cigarette after a meal).Several studies have shown that smoking restrictions in the workplace encourage smokers to quit or cut back on cigarette consumption.^8,9 According to a recent review of 26 studies on the effects of smoke‐free workplaces across the US, Australia, Canada and Germany, completely smoke‐free workplaces are associated with reductions in prevalence of smoking and fewer cigarettes smoked per continuing smoker.⁹ One study reported that strong local clean indoor air ordinances in California during 1990–1 were associated with an absolute quit rate (over the previous 6 months) 7.6% higher than in areas with no workplace laws.¹⁰ Another study conducted in Canada during the same time period found a 21% reduction in the odds of being a smoker in areas with high coverage versus those with low coverage of smoking bylaws.¹¹ These worksite studies have generally found that completely smoke‐free workplaces are associated with smoking cessation and reduction in cigarette consumption.However, of the 26 studies reviewed by Fichtenberg and Glantz, only two employed longitudinal data and none were specific to restaurants and bar regulations.⁹ The use of cross‐sectional data prevents determination of whether the regulations caused the reduced smoking or whether states and towns with lower smoking rates are more likely to adopt such regulations. These studies are also limited by their failure to control for town‐level factors that may confound the relationship between the presence of regulations and the observed levels of smoking. Furthermore, the few studies reviewed grouped together different smoking restriction sites (eg, worksites, schools, restaurants, public places), and assessed only state‐level rather than local laws.Another limitation of current research is that none has investigated how restaurant smoking regulations influence smokers'' attitudes and behaviours by existing attitudes towards smoking and smokers'' quitting behaviour. Smoking regulations in restaurants may have a stronger effect on smokers who have begun to change their perception of the social unacceptability of smoking in public places and on smokers who are already motivated to quit. Most research efforts have assumed homogeneity in attitudes and behaviours by examining the effect of bans on all adults and all smokers. Prochaska et al^12,13, for example, have characterised quitting as a process, with smokers classified according to their stage of change from precontemplation (earliest stage) to maintenance (last stage). A large variation exists in the quitting process—smokers often do not exhibit a steady progression through this change sequence¹⁴ and achievement of successful cessation often includes regression to a previous stage.¹⁵ Additionally, two obvious reasons for the limited research are the small samples used in many studies and the lack of longitudinal data to support stratified analyses. These data allowed us to investigate in detail heterogeneity in smoking regulation effects across attitudes and quitting behaviours among a smoker cohort.To help address the weaknesses of previous research, our study focused on the effect of smoking regulations over the 2‐year follow‐up period on two outcomes: (1) anti‐smoking attitudes among smokers who did or did not report anti‐smoking attitudes at baseline and (2) quitting behaviours among smokers who had or had not made a past year quit attempt at baseline. To our knowledge, this is the first longitudinal study to assess the effect of restaurant smoking restrictions on smokers'' attitudes towards smoking in restaurants and bars, quit attempts and actual quitting behaviour.     

An evaluation of process specific information resources,aimed at hazard analysis,in Small and Medium Enterprises in food manufacturing

Food borne illness continues to be a major global concern, with approximately 76 million cases in the US and 70,000 in the UK annually. The adoption of a food safety management system based upon Codex HACCP principles became a legal requirement in the UK on January 1st 2006 but some companies are inexperienced and fail to implement it correctly. Barriers to HACCP include time, money and expertise, particularly for SMEs and microbusinesses. Lack of expertise is a particular problem when constructing the hazard analysis component of HACCP. A sector specific information resource, using simple language with no technical terms or jargon, was developed to assist SMEs with hazard analysis. One hundred and twenty three SME food manufacturers were recruited and intervention and control groups were assigned, with the intervention group receiving the resource. Evaluation visits were performed after four months. Each company was assessed against a specific tool that determined knowledge, behavior and attitude to food safety. The resource was well received but there was no significant improvement in knowledge, behavior or attitude when comparing the intervention and control group scores. Significant differences in the behavior of SMEs and microbusinesses were evident with SMEs scoring higher in all sections of the resource than the microbusinesses. SMEs also had a significantly higher total knowledge score than microbusinesses but there were no significant differences in attitudes. It is apparent action must be taken to assist SMEs with hazard analysis and full HACCP implementation, but provision of a single resource without additional support is not enough.