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Management Problems (management + problem)
Kinds of Management Problems Selected AbstractsResolving Disease Management Problems in European-American and Latino Couples with Type 2 Diabetes: The Effects of Ethnicity and Patient Gender,FAMILY PROCESS, Issue 4 2000Lawrence Fisher Ph.D. The management of type 2 diabetes requires major life style changes. How patients and family members resolve disagreements about disease management affects how well the disease is managed over time. Our goal was to identify differences in how couples resolved disagreements about diabetes management based on ethnicity and patient gender. We recruited 65 Latino and 110 European-American (EA) couples in which one spouse had type 2 diabetes. Couples participated in a 10-minute videotaped, revealed differences interaction task that was evaluated with 7 reliable observer ratings: warm-engagement, hostility, avoidance, amount of conflict resolution, off-task behavior, patient dominance, and dialogue. A series of 2 × 2, Ethnicity × Sex ANOVAs indicated significant effects for Ethnicity and for the Ethnicity × Sex interaction, but not for Sex. Latino couples were rated as significantly more emotionally close, less avoidant, less hostile toward each other, and had less dominant patients than EA couples; however, Latino couples achieved significantly less problem resolution and were more frequently off-task than EA couples. These findings were qualified by patient gender. The findings highlight important differences in how couples manage diabetes based on ethnicity and patient gender, and suggest that effective family-based programs of intervention must take both characteristics into account. [source] Impact of Simulation Model Solver Performance on Ground Water Management ProblemsGROUND WATER, Issue 5 2008David P. Ahlfeld Ground water management models require the repeated solution of a simulation model to identify an optimal solution to the management problem. Limited precision in simulation model calculations can cause optimization algorithms to produce erroneous solutions. Experiments are conducted on a transient field application with a streamflow depletion control management formulation solved with a response matrix approach. The experiment consists of solving the management model with different levels of simulation model solution precision and comparing the differences in optimal solutions obtained. The precision of simulation model solutions is controlled by choice of solver and convergence parameter and is monitored by observing reported budget discrepancy. The difference in management model solutions results from errors in computation of response coefficients. Error in the largest response coefficients is found to have the most significant impact on the optimal solution. Methods for diagnosing the adequacy of precision when simulation models are used in a management model framework are proposed. [source] Robust Maintenance Policies for Markovian Systems under Model UncertaintyCOMPUTER-AIDED CIVIL AND INFRASTRUCTURE ENGINEERING, Issue 3 2006Kenneth D. Kuhn Many sources of error, some difficult to quantify, can limit the ability of asset management systems to accurately predict how built systems will deteriorate. This article introduces the use of robust optimization to deal with epistemic uncertainty. The Hurwicz criterion is employed to ensure management policies are never "too conservative." An efficient solution algorithm is developed to solve robust counterparts of the asset management problem. A case study demonstrates how the consideration of uncertainty alters optimal management policies and shows how the proposed approach may reduce maintenance and rehabilitation (M&R) expenditures. [source] Corporate social responsibility and the identification of stakeholdersCORPORATE SOCIAL RESPONSIBILITY AND ENVIRONMENTAL MANAGEMENT, Issue 3 2003Janita F. J. Vos As a management problem the identification of stakeholders is not easily solved. It comprises a modelling and a normative issue, which need to be solved in connection with each other. In stakeholder literature knowledge can be found, e.g. on various stakeholder categorizations, that could be useful for the modelling issue. However, the normative issue remains unresolved. Additionally, the modelling of the so-called stakeholder category ,the affected' further complicates this issue. Nevertheless, from a normative perspective, this group holds justified interests in aspects of organizational activity and its members are, for that reason, legitimate stakeholders. In this article it is explored to what extent critical systems heuristics can help in resolving the managerial problem of identifying stakeholders. Critical systems heuristics is a modelling methodology in which the normative aspect of modelling is crucial. Using the distinction between ,the involved' and ,the affected', a variety of boundary judgments are discussed. Special attention is given to the so-called ,witness' as a representative of the affected. Copyright © 2003 John Wiley & Sons, Ltd and ERP Environment. [source] The importance of ecological research for ecosystem management: The case of browsing by swamp wallabies (Wallabia bicolor) in commercially harvested native forestsECOLOGICAL MANAGEMENT & RESTORATION, Issue 1 2004Julian Di Stefano Summary Ecosystem management often proceeds within the context of sub-optimal relationships between ecologists and ecosystem managers, and management outcomes could be improved with greater collaboration between members of these disciplines. This paper identifies an ecosystem management problem resulting from the interaction between timber harvesting and browsing wallabies, and this case study is used to exemplify how ecological data and expertise can contribute to the process of ecosystem management. It is argued that appropriate use of existing ecological data, establishment of strategic new research and the implementation of management actions as experimental hypothesis tests can facilitate achievement of management objectives, but greater collaboration between ecologists and managers is required before this can occur. Reasons for sub-optimal relationships are outlined, and the potential for structural change within large State-run ecosystem management agencies to improve interactions between managers and ecologists is discussed. [source] Impact of Simulation Model Solver Performance on Ground Water Management ProblemsGROUND WATER, Issue 5 2008David P. Ahlfeld Ground water management models require the repeated solution of a simulation model to identify an optimal solution to the management problem. Limited precision in simulation model calculations can cause optimization algorithms to produce erroneous solutions. Experiments are conducted on a transient field application with a streamflow depletion control management formulation solved with a response matrix approach. The experiment consists of solving the management model with different levels of simulation model solution precision and comparing the differences in optimal solutions obtained. The precision of simulation model solutions is controlled by choice of solver and convergence parameter and is monitored by observing reported budget discrepancy. The difference in management model solutions results from errors in computation of response coefficients. Error in the largest response coefficients is found to have the most significant impact on the optimal solution. Methods for diagnosing the adequacy of precision when simulation models are used in a management model framework are proposed. [source] Optimal booking limits in the presence of strategic consumer behaviorINTERNATIONAL TRANSACTIONS IN OPERATIONAL RESEARCH, Issue 2 2006John G. Wilson Abstract We consider a two-period airline yield management problem where customers may act strategically. Specifically, we allow for the possibility that a customer may decide to defer purchase in the hope that a ticket cheaper than those currently on offer will become available. We also allow for the possibility that some customers will buy a more expensive ticket if the cheaper tickets are not available. We show how to find optimal booking limits in the presence of such strategic customer behavior. We also explicitly incorporate the fact that, once a booking limit has been reached, demand distributions are now censored distributions. [source] Scalp necrosis and giant cell arteritis: case report and issues in wound managementINTERNATIONAL WOUND JOURNAL, Issue 4 2005Stefan J Landis Abstract Scalp necrosis is rare in patients with giant cell arteritis. Here, we report the case of an 81-year-old woman who presented with a management problem that required a truly multidisciplinary approach to treatment. A combined approach of effective wound bed preparation with selective debridement, prolonged antimicrobial therapy, corticosteroid use and careful dressing choices resulted in a successful outcome in a potentially disastrous situation. [source] Conservation goals and fisheries management units for Atlantic salmon in the Baltic Sea areaJOURNAL OF FISH BIOLOGY, Issue 2001M-L. Koljonen The effective application of genetic information in fisheries management strategies implies political goal setting taking both conservation and fisheries management into account. The concept of sustainable use as set out by the Convention on Biological Diversity offers a valuable starting point in this respect, since the criterion for it is defined as the maintenance of genetic diversity within each species. However, strategic decisions are also needed on the practical level, where the actual genetic information can be taken into account. Genetic factors, such as glacial differentiation, the postglacial genetic structure of populations, gene flow levels and the probability of the existence of adaptive differences, have an effect on the formation of conservation and management units and on the long-term strategy for the sustainable use of aspecies. The Atlantic salmon (Salmo salar) in the Baltic Sea area is treated here as an example of a complicated management problem with a highly hierarchical genetic structure associated with marked loss of naturally reproductive stocks, extensive hatchery production and an effective international offshore fishery. The implications of genetic factors for the conservation and management strategy of the Baltic salmon is discussed in the light of the goals set by the Convention on Biological Diversity, the Straddling Fish Stocks and Highly Migratory Fish Stocks Agreement, the Habitats Directive of the European Union and the International Baltic Sea Fishery Commission. [source] MULTIPLE CRITERIA SCREENING OF A LARGE WATER POLICY SUBSET SELECTION PROBLEM,JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION, Issue 3 2001Siamak Rajabi ABSTRACT: A new screening approach is applied to a large-scale multiple criteria water management problem to remove actions that cannot possibly be in the best subset. An inherent advantage of the approach is its ability to identify inferior actions by examining them individually, rather than within subsets. In a case study involving the selection of actions to address high water levels in the Great Lakes-St. Lawrence Basin, two statistical indicators, the mode and the mean, are used to aggregate the opinions of experts and representatives of interest groups on the impacts of actions according to various criteria. Application of the screening approach shows that some of the proposed actions can be removed as they can never be in the optimal subset, thereby reducing the size of the problem. [source] A refined deterministic linear program for the network revenue management problem with customer choice behaviorNAVAL RESEARCH LOGISTICS: AN INTERNATIONAL JOURNAL, Issue 6 2008Sumit Kunnumkal Abstract We present a new deterministic linear program for the network revenue management problem with customer choice behavior. The novel aspect of our linear program is that it naturally generates bid prices that depend on how much time is left until the time of departure. Similar to the earlier linear program used by van Ryzin and Liu (2004), the optimal objective value of our linear program provides an upper bound on the optimal total expected revenue over the planning horizon. In addition, the percent gap between the optimal objective value of our linear program and the optimal total expected revenue diminishes in an asymptotic regime where the leg capacities and the number of time periods in the planning horizon increase linearly with the same rate. Computational experiments indicate that when compared with the linear program that appears in the existing literature, our linear program can provide tighter upper bounds, and the control policies that are based on our linear program can obtain higher total expected revenues. © 2008 Wiley Periodicals, Inc. Naval Research Logistics, 2008 [source] Optimal control of a water reservoir with expected value,variance criteriaOPTIMAL CONTROL APPLICATIONS AND METHODS, Issue 1 2007Andrzej Karbowski Abstract The article presents how to solve a reservoir management problem, which has been formulated as a two-criteria stochastic optimal control problem. Apart from the expected value of a performance index, its variance is also considered. Three approaches are described: a method based on the Lagrange function; a method based on the ordinary moment of the second order (finite time horizon); and a method based on linear programming (infinite time horizon). In the second part of the article, they are assessed in a case study concerning a reservoir in the southern part of Poland. Copyright © 2006 John Wiley & Sons, Ltd. [source] Solutions and recommendations to address issues with Company XYZ's performance management systemPERFORMANCE IMPROVEMENT, Issue 1 2009Mike Kolich According to a recent attitude survey, work objectives, advancement, growth, job assignment, information, pay for performance, and compensation are issues in which Company XYZ's engineering department fell below the industry average. The issues are all symptoms of a larger performance management problem. This article offers solutions and recommendations focused on the introduction of an individual development planning document with an emphasis on goals tied to the corporate mission and an increase in feedback and communication. [source] Enterocutaneous fistula: a single-centre experienceANZ JOURNAL OF SURGERY, Issue 3 2010D. E. Gyorki Abstract Background:, Enterocutaneous fistulae (ECFs) present a difficult management problem and can cause significant morbidity. The aim of the study was to assess the outcome of these patients. Methods:, A retrospective chart review of all patients with ECF managed at a tertiary centre between 1996 and 2006 was performed. Demographic, management and outcome data including ECF closure, morbidity and mortality were recorded. Results:, A total of 33 patients (17 male) were identified with ECF (median age: 63 years, range: 27,84). The primary aetiology was Crohn's (30%), anastomotic leak (24%), iatrogenic (18%), mesh (6%), neoplasia (6%) and other (16%). Definitive surgery was undertaken in 21 (64%) at a median of 6.4 months (0.4,72 range) following presentation. Twenty percent of patients required emergency surgical intervention and 5 patients required preoperative total parenteral nutrition (TPN). Surgical management was formal resection and reanastomosis in all patients, with a mean operative time of 4.75 h (standard deviation = 1.8). The median hospital stay for the operative group was 19 days (7,85). Four patients required post-operative TPN with one patient requiring home TPN. Fistula closure rate was 97% (operative group: 21 out of 21; non-operative group: 11 out of 12). Mean follow-up was 37.3 months (0.5,217). Six (19%) operative patients developed fistula recurrence. There were two deaths at 2 and 5 months (fistula aetiology malignant colonic fistula and radiation enteritis, respectively). Conclusion:, Patients with ECF can be treated with low morbidity and low recurrence rate in a multidisciplinary setting. We believe that patients with ECF should be referred to specialist units for management. [source] CR12 ENTEROCUTANEOUS FISTULAE , ARE WE GETTING IT RIGHT?ANZ JOURNAL OF SURGERY, Issue 2007D. E. Gyorki Purpose Enterocutaneous fistulae (ECF) present a difficult management problem and can cause significant morbidity. The aim of the study was to assess the outcome of these patients. Methodology A retrospective chart review of all patients with ECF managed at a tertiary centre between 1996 and 2006. Demographic, management and outcome data was recorded. Factors influencing ECF closure and outcome were assessed with Cox regression analysis. Results Thirty-three patients (17 male) were identified with ECF (median age 63, range 27,84). The primary aetiology was Crohn's (30%), anastomotic leak (24%), iatrogenic (18%), mesh (6%), neoplasia (6%) and other (16%). Definitive surgery was undertaken in 21 (64%) at a median of 6.4 months (0.4,72 range) following presentation. Twenty percent of patients required emergency surgical intervention and 5 patients required preoperative total parenteral nutrition (TPN). Surgical management was formal resection and reanastomosis in all patients, with a mean operative time of 4.75 hours (SD = 1.8). The median hospital stay for the operative group was 19 days (7,85). Four patients required post-operative TPN. Fistula closure rate was 97% (operative group 21/21, non-operative group 11/12). Mean follow up was 37.3 months (0.5,217). Six operative patients (19%) developed fistula recurrence. There were 2 deaths at 2 and 5 months (fistula aetiology malignant colonic fistula and radiation enteritis respectively). No factor was predictive of fistula recurrence. Conclusion Patients with enterocutaneous fistula can be treated with low morbidity and low recurrence rate in a multidisciplinary setting. Patients with ECF should be referred to specialist units for management. [source] CyberCarrier service and network managementBELL LABS TECHNICAL JOURNAL, Issue 4 2000Michael R. Brenner This paper presents an overview of the service and network management architecture of Lucent Technologies' CyberCarrier Solution. Businesses of all sizes and from all sectors are choosing to outsource large portions of their information technology (IT) operations to Internet-based data centers that host application service providers (ASPs). Many network service providers (NSPs) have decided to become CyberCarrier service providers (CCSPs),that is, they have decided to expand their businesses to include ASP data center hosting services. Managing these new ASP data center hosting services is one of the most urgent challenges encountered by a CCSP, and its solution is arguably critical to a CCSP's long-term success. Although introducing ASP data center hosting services increases and diversifies a CCSP's revenue, it also significantly complicates the CCSP's management processes. This paper defines an abstract management functional architecture that divides the CCSP management problem into tractable pieces and addresses each of them. Then it explains how the CyberCarrier Solution maps onto that functional architecture. Finally, it explores how Lucent will evolve its CyberCarrier Solution through future management system innovations. [source] Hospital in-patients with diabetes: increasing prevalence and management problemsDIABETIC MEDICINE, Issue 1 2005M. E. Wallymahmed Abstract Aims To re-assess the prevalence, management problems, clinical outcomes and discharge summaries of hospital in-patients with diabetes. Methods Case records of all patients occupying in-patient beds were audited on a single weekday in 2003 in a large urban hospital and repeated after 3 months. Data was compared with an identical audit 12 years previously. Results Over 12 years the number of beds available for admission (1191) had reduced by 25% with a bed occupancy of 97%. Diabetes prevalence had increased from 7.0% to 11.1% (P < 0.01) (97% Type 2). Diabetes management was considered inappropriate in 29%, more than in 1991 (20%). After 3 months, discharge summaries had been completed on 75% of patients but diabetes was mentioned in only 53%. Conclusion The prevalence of in-patient diabetes (11.1%) was over 50% greater and diabetes management was suboptimal in more patients than in 1991. In many length of stay was prolonged and almost half of the discharge summaries did not mention diabetes. These findings have major implications for service delivery and resource planning. [source] A retrospective study of dental behavior management problems in children with attention and learning problemsEUROPEAN JOURNAL OF ORAL SCIENCES, Issue 5 2004My Blomqvist Attention and learning problems in children are common. The aim of this study was to investigate whether children with attention and learning problems had more dental behavior management problems (BMP), more cancelled and missed appointments, and more traumatic dental injuries compared with a control group. All children born in 1991 attending mainstream schools (n = 555) in one Swedish municipality were screened for behavioral and learning problems. Conners' 10-item questionnaire and a questionnaire focused on executive and learning problems were used. A total of 128 screen-positive patients were index cases and 131 screen-negative patients control cases. The dental records of these children were studied from 1 yr of age until the child reached 10 yr. Behavior management problems on at least one occasion were more common in the index group (54% vs. 37%). The percentage of appointments at which the children exhibited BMP was higher in the index group (13% vs. 7%). No differences were found for cancelled or missed appointments or dental traumatic injuries between the two groups. In conclusion, the results of this study show that children with attention and learning problems had significantly more dental behavior management problems compared with a control group. [source] Real options for precautionary fisheries managementFISH AND FISHERIES, Issue 2 2008Eli P Fenichel Abstract The 1996 Food and Agriculture Organization's (FAO) ,Guidelines on the Precautionary Approach to Fisheries and Species Introduction' raise important issues for fisheries managers, but fail to prescribe an approach for risk management. The distinguishing characteristics of the ,precautionary approach' are the inclusion of uncertainty and ,an elaboration on the burden of proof'. The FAO precautionary approach emphasizes that managers should be risk-averse, but does not provide tools for determining the appropriate degree of risk aversion. Consequently, application of the precautionary approach often leads to decision-making based on ad hoc safety margins. These safety margins are seldom chosen with explicit consideration of trade-offs. If the emphasis was shifted to choosing between competing uncertainties, then managers could manage risk. By attempting to avoid risk, managers may gain exposure to other risks and perhaps miss valuable opportunities. We place fishery management problems within the rubric of ,real investment' problems, and compare and contrast the consideration of risk by alternative investment frameworks. We show that traditional investment frameworks are inappropriate for fishery management, and furthermore, that traditional precautionary approaches are arbitrary and without basis in decision theory. Quantitative decision-making techniques, such as formal decision analysis (FDA), enable integration of competing hypotheses that help alleviate burden-of-proof issues. These techniques help analysts consider sources of uncertainty. FDA, however, can still be subject to arbitrary safety margins because such analyses often focus on determining which strategies best achieve, or avoid, targets that have been established without complete consideration of trade-offs. A managerial finance approach, real options analysis (ROA), is an alternative and complementary decision-making technique that enables managers to compute precautionary adjustments that couple the size of the ,safety margin' with the amount of uncertainty, thereby optimizing risk exposure and avoiding the need for arbitrary safety margins. We illustrate the advantages of an approach that combines FDA and ROA, using a heuristic example about a decision to re-introduce Atlantic salmon (Salmo salar L.) into Lake Ontario. Finally, we provide guidance on applying ROA to other fishery problems. The precautionary approach requires that managers consider risk, but considering risk is not the same as managing it. Here ROA is useful. [source] Developing co-management in an artisanal gill net fishery of a deep hydro-electric reservoir in Sri LankaFISHERIES MANAGEMENT & ECOLOGY, Issue 5 2002S. NATHANAEL Abstract Victoria, is a recently (1984) impounded, deep, hydro-electric reservoir in Sri Lanka with an established commercial fishery. Participatory appraisal of the fishing community revealed decreasing reliance on fishing income with many fishermen moving away to supplementary occupations because of declining fish catches. Illegal fishing and theft of fishing gear resulting from open access, difficulties encountered in enforcing fisheries regulations and the need for fishermen to find alternative sources of income during low water levels are the major management problems. The top,down centralized management approach previously practised was ineffective in addressing any of these issues. Therefore, the possibilities and limitations for introducing co-management as an alternative management strategy were discussed. Financial hardship coupled with perceived benefits through state sponsored welfare schemes caused a positive attitude change among fishermen, making them respond favourably to fishery management. Establishing a licensing system for controlled access, ensuring greater user-group participation through equitable distribution of state sponsored benefits among members, attempting to enforce penalties for illegal fishing linked with surprise checks to enforce management regulations, and obtaining stakeholder perceptions regarding management issues are some of the recent steps taken by the Fishermen's Co-operative Society which would positively contribute towards developing effective co-management in this reservoir. [source] Usefulness of fluorine-18 fluorodeoxyglucose positron emission tomography in patients with a residual structural abnormality after definitive treatment for squamous cell carcinoma of the head and neckHEAD & NECK: JOURNAL FOR THE SCIENCES & SPECIALTIES OF THE HEAD AND NECK, Issue 12 2004Robert E. Ware MB Abstract Background. Residual structural abnormalities after definitive treatment of head and neck squamous cell carcinoma (HNSCC) are common and pose difficult management problems. The usefulness of fluorine-18 fluorodeoxyglucose positron emission tomography (FDG PET) to supplement conventional evaluation with clinical and standard radiologic examination (CE) in such patients was assessed. Methods. Fifty-three eligible patients were identified with residual structural abnormalities on CE. True disease extent could be validated in 46 patients. Patients had a median potential follow-up of 55 months (range, 41,75 months) from the date of PET scan to the analysis closeout date. Results. PET had better diagnostic accuracy than CE (p = .0002) and induced management change in 21 patients (40%; 95% confidence interval [CI], 26%,54%), including avoidance of unnecessary planned surgery in 14 patients with negative PET. Appropriate management change was confirmed in 19 (95%) of 20 evaluable cases. Disease presence and extent assessment by PET were significant predictors of survival (p < .0001), whereas the extent of disease determined by CE was not. Conclusion. PET added significantly to the value of CE in restaging disease in patients with structural abnormalities after definitive treatment of HNSCC. Management decisions based on PET were appropriate in most patients. © 2004 Wiley Periodicals, Inc. Head Neck26: 1008,1017, 2004 [source] Human resource management problems over the life cycle of small to medium-sized firmsHUMAN RESOURCE MANAGEMENT, Issue 4 2003Matthew W. Rutherford This study uses a sample of 2,903 small to medium-sized firms to examine the manner in which HR problems vary over the organizational life cycle. We found that a four-stage model was appropriate. Interestingly, firm age did not emerge as a significant indicator of stage,the firms' HR problems varied across stages defined by growth. Training problems were highest in high-growth firms and lowest in low-growth firms; compensation problems were highest in moderate-growth firms and lowest in high-growth firms; and recruiting problems were highest in no-growth firms and lowest in low-growth firms. © 2004 Wiley Periodicals, Inc. [source] An institutional perspective on developing and implementing intranet- and internet-based information systemsINFORMATION SYSTEMS JOURNAL, Issue 3 2003Tom Butler Abstract. ,This paper adopts a constructivist, case-based research strategy to examine the development and implementation of intranet- and internet-based information systems (IS) in a single organization. Institutional theory is used to describe, explain and understand the commitments of social actors in the development of web-based IS. The findings illustrate that: (1) social and organizational problems similar to those that beset ,traditional' IS development arise in the development and implementation of web-based IS; (2) ,top-down' development and implementation strategies give rise to more conflict and change management problems than ,bottom-up' approaches; and (3) fostering high levels of commitment to organizational imperatives is key to the successful development and implementation of web-based IS. [source] Hybrid approach with an expert system and a genetic algorithm to production management in the supply netINTELLIGENT SYSTEMS IN ACCOUNTING, FINANCE & MANAGEMENT, Issue 1-2 2006awrynowicz A new approach to solving production management problems in the supply net is proposed. An expert system designed to help companies in medium-term and short-term production planning is discussed. The proposed expert system considers alternative process plans for a job and outsourcing, when a bottleneck exists in the machine. The proposed hybrid system uses the output of the expert system as the input of the genetic algorithm. The output of the genetic algorithm is a near optimal schedule. The proposed method does not require any unrealistic assumptions. It can be used to solve highly complicated and non-linear functions of a realistic problem. Copyright © 2007 John Wiley & Sons, Ltd. [source] Dental behaviour management problems: the role of child personal characteristicsINTERNATIONAL JOURNAL OF PAEDIATRIC DENTISTRY, Issue 4 2010ANNIKA GUSTAFSSON International Journal of Paediatric Dentistry 2010; 20: 242,253 Aim., This study aimed to investigate the role of dental fear (DF) and other personal characteristics in relation to dental behaviour management problems (DBMP). Design., A study group of 230 patients (7.5,19 years old; 118 girls), referred because of DBMP, was compared to a reference group of 248 same-aged patients (142 girls) in ordinary dental care. Patients and their parents independently filled in questionnaires including measures of fear and anxiety, behavioural symptoms, temperamental reactivity, and emotion regulation. Results., Study group patients referred because of DBMP differed from the reference group in all investigated aspects of personal characteristics. In the multivariate analyses, DF was the only variable with consistent discriminatory capacity through all age and gender subgroups. Aspects of anxiety, temperament, and behavioural symptoms contributed, but differently for different subgroups and at different levels of dental fear. Conclusions., Among older children and adolescents, DF deserves to be re-established as the single most important discriminating variable for DBMP at clearly lower scores than commonly used. Further research should focus on the different patterns of DBMP development, considering various personal characteristics that may trigger, maintain, or exacerbate young patients' vulnerability to DF and DBMP. [source] Parental perspectives on preterm children's oral health behaviour and experience of dental care during preschool and early school yearsINTERNATIONAL JOURNAL OF PAEDIATRIC DENTISTRY, Issue 4 2009SUSANNE BROGÅRDH-ROTH Background., Children born preterm (PT) have medical conditions and impairments that may affect their oral health. Hypothesis., Our hypothesis for the study was that PT children display more dental behaviour management problems (BMPs) and less favourable oral health behaviour than controls (C). Methods., Parents of 153 PT children and 153 C children were interviewed regarding the children's oral health behaviour and experience of dental care on two occasions, 2 years apart. The interviews concerned the preschool period and the early school years, respectively. Results., BMPs were more common in PT children of preschool age, but not during the early school years. Regarding oral health behaviour, there were no differences between the groups, except that PT children had more problems with toothbrushing than C children in the preschool period, in spite of the fact that the PT group reported more medical health problems and more anxious behaviour and indications of cognitive problems than the C group. Conclusions., Children born PT exhibit several risk factors for both BMP and impaired oral health. It is essential that this group of patients is identified early and receives special attention from the dental services. [source] Dental fear/anxiety and dental behaviour management problems in children and adolescents: a review of prevalence and concomitant psychological factorsINTERNATIONAL JOURNAL OF PAEDIATRIC DENTISTRY, Issue 6 2007GUNILLA KLINGBERG Objectives., The objectives of this article were to examine the literature published from 1982 to 2006 and to evaluate prevalence of dental fear and anxiety (DFA) and dental behaviour management problems (DBMP) in children and adolescents, and their relationships to age, sex, general anxiety, temperament, and general behavioural problems. Methods., A broad search of the PubMed database was performed using three combinations of search terms. Results., A large proportion of the identified articles could not be used for the review owing to inadequate endpoints, measures or poor study design. Thirty-two papers of acceptable quality were identified and reviewed. The prevalence of both DFA and DBMP were estimated to 9%, with a decrease in prevalence with age. DFA/DBMP were more frequent in girls. DFA/DBMP were related to general fear and both internalizing and externalizing behavioural problems, although these relationships were not clear-cut. Temperament was related to both DFA and DBMP but with different temperamental characteristics, while general behavioural problems mainly correlated with DBMP. Conclusions., DFA/DBMP are common, and several psychological factors are associated with the development of these problems. In order to better understand these relationships, a number of issues concerning design of research and measurement of DFA/DBMP have to be dealt with. [source] A survey of specialist paediatric dental services in Sweden: results from 2003, and trends since 1983INTERNATIONAL JOURNAL OF PAEDIATRIC DENTISTRY, Issue 2 2006G. KLINGBERG Summary. The child population in Sweden has changed dramatically during the last 20 years. Changes have also occurred within the Public Dental Service (PDS), regarding the provision of dental care to children and adolescents. All these changes may affect the referral pattern and provision of specialist dental care for children and adolescents. Objectives., The primary aim of this study was to survey the services provided by specialists in paediatric dentistry in Sweden during 2003. A secondary aim was to compare the results with previous surveys. Methods., A Web-based survey was sent to all 34 specialist paediatric dentistry clinics and was answered by all clinics. Data were compared with results from the surveys performed in 1983, 1989, and 1996. Results., The number of paediatric dentists had been relatively constant over the last 20 years, whereas the number of children referred to paediatric dentists had increased by 28% since 1983. It was estimated that 1·3% of all children in Sweden are treated at a specialist paediatric dental clinic in 2003. Dental treatment need in combination with behaviour management problems (BMP) was the main reason for referral and occurred in 37% of all referrals. The proportion of medically compromised children/children with disabilities had increased from 6% in 1983 to 22% in 2003. The number of patients treated using sedation and general anaesthesia had increased since 1983, and particularly since 1996. Conclusions., Despite improvements in dental health among children and adolescents in Sweden during the last 20 years, an increasing number of children are referred for specialist paediatric dental treatment. There is an urgent need to increase the number of specialist paediatric dentists in Sweden in order to ensure the continuation of high quality of dental care for children and adolescents. [source] Resource management model and performance evaluation for satellite communicationsINTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS AND NETWORKING, Issue 2 2001Axel Jahn Abstract Efficient resource management is mandatory to achieve maximum system capacity for next generation communications systems. Resource management deals with the available spectral band, time, power, and space for a transmission signal. It includes (i) the frequency planning, (ii) the selection of transmit power, and (iii) the assignment of the channels and access nodes to the users. The paper presents a generalized notation as well as graph algorithms for resource management problems. Impairment graphs can be used for frequency planning, whereas flow graphs are suitable for channel access problems. To evaluate the performance of the resource management, service criteria (such as blocking or the carrier to interference ratio C/I) or efficiency criteria (bandwidth requirements) can be derived from the graphs. The resource management techniques are applied to satellite networks with non-geostationary orbits yielding time-variant network topologies. As a simple example, the channel assignment and capacity optimization of the EuroSky Way system are shown. Furthermore, a comparison of fixed, dynamic and hybrid channel allocation schemes (FCA, DCA, HCA) for a typical MEO satellite scenario is given. Satellite diversity and its impact on bandwidth requirement and transmission quality is also examined. Finally, it is shown how spread spectrum systems can be investigated with the presented tools. Copyright © 2001 John Wiley & Sons, Ltd. [source] Parallel Algorithms for Dynamic Shortest Path ProblemsINTERNATIONAL TRANSACTIONS IN OPERATIONAL RESEARCH, Issue 3 2002Ismail Chabini The development of intelligent transportation systems (ITS) and the resulting need for the solution of a variety of dynamic traffic network models and management problems require faster-than-real-time computation of shortest path problems in dynamic networks. Recently, a sequential algorithm was developed to compute shortest paths in discrete time dynamic networks from all nodes and all departure times to one destination node. The algorithm is known as algorithm DOT and has an optimal worst-case running-time complexity. This implies that no algorithm with a better worst-case computational complexity can be discovered. Consequently, in order to derive algorithms to solve all-to-one shortest path problems in dynamic networks, one would need to explore avenues other than the design of sequential solution algorithms only. The use of commercially-available high-performance computing platforms to develop parallel implementations of sequential algorithms is an example of such avenue. This paper reports on the design, implementation, and computational testing of parallel dynamic shortest path algorithms. We develop two shared-memory and two message-passing dynamic shortest path algorithm implementations, which are derived from algorithm DOT using the following parallelization strategies: decomposition by destination and decomposition by transportation network topology. The algorithms are coded using two types of parallel computing environments: a message-passing environment based on the parallel virtual machine (PVM) library and a multi-threading environment based on the SUN Microsystems Multi-Threads (MT) library. We also develop a time-based parallel version of algorithm DOT for the case of minimum time paths in FIFO networks, and a theoretical parallelization of algorithm DOT on an ,ideal' theoretical parallel machine. Performances of the implementations are analyzed and evaluated using large transportation networks, and two types of parallel computing platforms: a distributed network of Unix workstations and a SUN shared-memory machine containing eight processors. Satisfactory speed-ups in the running time of sequential algorithms are achieved, in particular for shared-memory machines. Numerical results indicate that shared-memory computers constitute the most appropriate type of parallel computing platforms for the computation of dynamic shortest paths for real-time ITS applications. [source] | ||||||||||||||||||||||||||||