Improved adaptive group testing algorithms with applications to multiple access channels and dead sensor diagnosis

We study group-testing algorithms for resolving broadcast conflicts on a multiple access channel (MAC) and for identifying the dead sensors in a mobile ad hoc wireless network. In group-testing algorithms, we are asked to identify all the defective items in a set of items when we can test arbitrary subsets of items. In the standard group-testing problem, the result of a test is binary—the tested subset either contains defective items or not. In the more generalized versions we study in this paper, the result of each test is non-binary. For example, it may indicate whether the number of defective items contained in the tested subset is zero, one, or at least two. We give adaptive algorithms that are provably more efficient than previous group testing algorithms. We also show how our algorithms can be applied to solve conflict resolution on a MAC and dead sensor diagnosis. Dead sensor diagnosis poses an interesting challenge compared to MAC resolution, because dead sensors are not locally detectable, nor are they themselves active participants. A preliminary version of this paper was presented at SPAA 2006.     

Why Ugandan rural households are opting to pay community health insurance rather than use the free healthcare services

Twikirize JM, O'Brien C. Why Ugandan rural households are opting to pay community health insurance rather than use the free healthcare services Uganda reintroduced free healthcare in 2001, but today, nine years later, less than 30 per cent of the population are using these services. This study investigated why rural households were under‐utilising the government's free health services and turning to community health insurance instead. A survey carried out on 260 randomly selected households was triangulated with qualitative data gained from 3 focus groups and 12 in‐depth interviews. The findings showed that 21 per cent of the households always accessed the government's free health services, while 79 per cent used private health services. The reasons given were poor quality services, including frequent drug stock‐outs, unmotivated and insufficiently trained health personnel, and overcrowding. Factors influencing enrolment in community health insurance included easier access to healthcare, financial protection against the cost of care, better quality care and benefits related to mutual assistance. This has both practical and policy implications, which are discussed in this article.     

Ask and you shall receive: Social network contacts’ provision of help during the job search

Social network contacts—the people who are asked to help with others’ job searches—are key players in the job networking process. Before job seekers can become employed with the help social networks, contacts must first be able and willing to share the social resources job seekers need for their search. Little is known about the factors that affect contacts’ ability and willingness to do this. Analyses of a unique dataset of contacts show that they typically have access to resources and help job seekers by sharing them. Still, contacts are better able to help when they are male, employed, and better educated than job seekers. They are more willing to help when they perceive job seekers to be “good” workers. In identifying the conditions in which contacts provide social resources, this study illustrates how social networks are a productive job search strategy for some, but not all, job seekers.     

Access Barriers to Mental Health Services for Older Adults from Diverse Populations: Perspectives of Leaders in Mental Health and Aging

This project is based on the results of telephone surveys with 52 local, state, and national informed respondents including policymakers, county leaders, planners, and advocates in mental health and aging with a particular focus on the states of California and Florida. This article addresses challenges to access to mental health services for diverse older adults including barriers related to race and ethnicity, socioeconomic status, location, age, gender, immigrant status, language, sexual orientation, and diagnosis. The article also highlights broad themes that emerged including (1) the importance of outreach and transportation tailored to diverse elders, and (2) recruitment of diverse staff and training related to diversity. The article concludes with policy and practice recommendations to reduce these disparities in access to mental health services for diverse populations of older adults.     

Assessing political participation on the Internet in contemporary China

Drawing on the resource model of political participation, this study examines the ways in which various resources, including money, computer and Internet access, Internet skills, and civic skills predict Chinese citizens’ political participation online. The results showed that income was a significant predictor of online political participation regardless of whether it was by using the Internet to contact governmental officials, monitoring public policies online, or participating in online protests. Civic skills also consistently predicted the three forms of online political participation. Computer and Internet access, as well as Internet skills, were significant predictors of some forms of online political participation, but not all of them. Political interest positively moderated the association between income and each of the three dependent variables. The theoretical and empirical implications of these results are discussed.     

A Model for Change: Legislative Advocacy to Improving Access for the Uninsured and Underinsured in New York State 1

Advocates can successfully improve access to health care for people without health insurance. This article demonstrates the success of what began as a local advocacy effort to improve access to health care on Long Island, which later grew to become a major statewide advocacy movement. It explores the process taken by local coalition members to successfully fight for monumental public health legislation—first locally then statewide—to improve access to hospital care for the medically indigent. Using New York State as a model, it includes several approaches that could facilitate the enactment of legislation in other states. The experiences of New York advocates suggest that with focused collaborative efforts it is feasible to promote significant changes to public health laws to benefit the uninsured and underinsured.     

开放获取环境下图书馆信息资源建设探析

开放获取运动的兴起与发展,是信息世界的一场革命,对信息传播重要媒介之一的图书馆提出了新课题。开放获取运动,弱化了图书馆的传统职能,对图书馆资源建设理念、服务模式等产生重大影响。图书馆在开放获取环境下要想生存与发展,必须提高认识、积极实践、利用优势、加强资源整合。     

The health care system of the People's Republic of China: Between privatization and public health care

Chinese health care policy has undergone numerous reforms in recent years that have often led to new challenges, inciting the need for further reform. The most recent reforms attempt to find a middle path between public health care provision and commercial private insurance. In this way, China is following in the footsteps of countries that initially increased the role of privatization in the 1990s and at the beginning of the 21st century, but are now gearing towards public health care. However, this process of constant reform has led to a lack of transparency in the functioning of the health care system, provoking a loss in public trust. There remains an important degree of uncertainty about the future direction of developments in China. Nonetheless, a dual financing approach to health care using tax finance and social insurance might yet crystallize, offering a potential model to inform developments in other countries.     

Post Acute Care of the Elderly in Singapore What Factors Influence Use of Services?

This research focused on understanding the factors associated with utilization of post-acute care services in Singapore and how these are woven into family care as well as the lived experience of elderly persons and their families. The multi-method study applied Andersen's model and the quantitative results of the 299 elderly Singaporeans surveyed showed medical and physical conditions, perceived health and utility, knowledge and previous use of service, ethnicity, family size, paid help, housing type, and living arrangement as significant factors. Qualitative results from interviews of a subsample of 13 elderly and their family members and focus group discussions of providers consistently pointed affordability of services as an important factor. Findings surfaced the question of service accessibility and its implications on practice, policy, and research.