A Snapshot on the Development of Social Work Education in China: A Delphi Study

Social work education in China has now been reinstated for almost two decades, after it was discontinued in the early 1950s. Due to various reasons, so far, there has not been a standardised social work curriculum in China. This article reports on the first empirical study finished in late 2001. Employing a Delphi technique, 47 social work scholars were invited to provide their opinions on the nature of social work in China, the requirements of social work graduates and the social work curriculum at the undergraduate level. The findings indicate that despite the influence of the Western model induced mainly by social work scholars in Hong Kong, social work education in China is moving towards an indigenised model within its unique social–political–cultural context. Respondents tended to adopt an expert model and the ‘helping people to help themselves’ principle. Social work is understood as being instrumental to enhancing the rapid economic changes by employing scientific knowledge and skills to resolve social and personal problems, stabilise society, and enhance social participation. To nurture its graduates with the competence to fulfil these social assignments, a broad‐base of social science knowledge, generic social work skills, special personal qualities and political sensitivity is included in the curriculum.     

New Approaches to Human Mobility: Using Mobile Phones for Demographic Research

This article explores new methods for gathering and analyzing spatially rich demographic data using mobile phones. It describes a pilot study (the Human Mobility Project) in which volunteers around the world were successfully recruited to share GPS and cellular tower information on their trajectories and respond to dynamic, location-based surveys using an open-source Android application. The pilot study illustrates the great potential of mobile phone methodology for moving spatial measures beyond residential census units and investigating a range of important social phenomena, including the heterogeneity of activity spaces, the dynamic nature of spatial segregation, and the contextual dependence of subjective well-being.     

Combined Pricing and Portfolio Option Procurement

In this paper, we study a single‐product periodic‐review inventory system that faces random and price‐dependent demand. The firm can purchase the product either from option contracts or from the spot market. Different option contracts are offered by a set of suppliers with a two‐part fee structure: a unit reservation cost and a unit exercising cost. The spot market price is random and its realization may affect the subsequent option contract prices. The firm decides the reservation quantity from each supplier and the product selling price at the beginning of each period and the number of options to exercise (inventory replenishment) at the end of the period to maximize the total expected profit over its planning horizon. We show that the optimal inventory replenishment policy is order‐up‐to type with a sequence of decreasing thresholds. We also investigate the optimal option‐reservation policy and the optimal pricing strategy. The optimal reservation quantities and selling price are shown to be both decreasing in the starting inventory level when demand function is additive. Building upon the analytical results, we conduct a numerical study to unveil additional managerial insights. Among other things, we quantify the values of the option contracts and dynamic pricing to the firm and show that they are more significant when the market demand becomes more volatile.     

Estimating the underlying change in unemployment in the UK

By setting up a suitable time series model in state space form, the latest estimate of the underlying current change in a series may be computed by the Kalman filter. This may be done even if the observations are only available in a time-aggregated form subject to survey sampling error. A related series, possibly observed more frequently, may be used to improve the estimate of change further. The paper applies these techniques to the important problem of estimating the underlying monthly change in unemployment in the UK measured according to the definition of the International Labour Organisation by the Labour Force Survey. The fitted models suggest a reduction in root-mean-squared error of around 10% over a simple estimate based on differences if a univariate model is used and a further reduction of 50% if information on claimant counts is taken into account. With seasonally unadjusted data, the bivariate model offers a gain of roughly 40% over the use of annual differences. For both adjusted and unadjusted data, there is a further gain of around 10% if the next month's figure on claimant counts is used. The method preferred is based on a bivariate model with unadjusted data. If the next month's claimant count is known, the root-mean-squared error for the estimate of change is just over 10000.     

Opportunistic data structures for range queries

In this paper, we study the problem of supporting range sum queries on a compressed sequence of values. For a sequence of n k-bit integers, k ≤ O(log n), our data structures require asymptotically the same amount of storage as the compressed sequence if compressed using the Lempel-Ziv algorithm. The basic structure supports range sum queries in O(log n) time. With an increase by a constant factor in the storage complexity, the query time can be improved to O(log log n + k). The work described in this paper is fully supported by a grant from the Research Grant Council of the Hong Kong Special Administrative Region, China (CityU 1071/02E). A preliminary version has appeared in 11th International Conference in Computing and Combinatorics (COCOON'05).     

Blog power: Examining the effects of practitioner blog use on power in public relations

While blogs are not yet a standard public relations tool, practitioners use blogs to enhance their power within their organizations. Using an online survey of public relations practitioners, this pilot test examined the relationship between power and blog use. Three factored categorizations of blog use among practitioners emerged: routine information and research, interactive blog communication, and issues identification. Results showed differences based on power, between blog users and non-users, owner-practitioners and non-owners, among others.     

Career Counseling With Lesbian,Gay, Bisexual,and Transgendered Persons: The Next Decade

The author, on the basis of an analysis of the strengths and weaknesses of the existing literature as well as the relevant opportunities and threats, proposes future directions for career counseling with lesbian, gay male, bisexual male and female, and transgendered persons. Suggestions include efforts for theory development, empirical research, career assessment, counseling practice, and counselor education.     

Online bottleneck matching

We consider the online bottleneck matching problem, where $k$ server-vertices lie in a metric space and $k$ request-vertices that arrive over time each must immediately be permanently assigned to a server-vertex. The goal is to minimize the maximum distance between any request and its server. Because no algorithm can have a competitive ratio better than $O(k)$ for this problem, we use resource augmentation analysis to examine the performance of three algorithms: the naive Greedy algorithm, Permutation, and Balance. We show that while the competitive ratio of Greedy improves from exponential (when each server-vertex has one server) to linear (when each server-vertex has two servers), the competitive ratio of Permutation remains linear when an extra server is introduced at each server-vertex. The competitive ratio of Balance is also linear with an extra server at each server-vertex, even though it has been shown that an extra server makes it constant-competitive for the min-weight matching problem.     

Voluntary Midlife Career Change: Integrating the Transtheoretical Model and the Life‐Span,Life‐Space Approach

Frequent career change is the predicted experience of workers in the global economy. Self‐initiating career changers are a substantial subset of the total population of career changers. There is currently a dearth of theory and research to help career counselors conceptualize the career change process for the application of appropriate interventions. The authors present an integration of a well‐researched behavior change theory, the transtheoretical model of change, with Super's (1990) life‐span, life‐space approach. The corresponding stages of the 2 models are discussed along with theoretically appropriate interventions. The integrated model provides the basis for future research on the change process for voluntary midlife career changers.     

Quantity Flexibility Contract in the Presence of Discount Incentive

We design a new contract, which we refer to as the QFi contract, that combines the quantity flexibility (QF) mechanism and the price‐only discount incentive. Under the QF contract, the buyer does not assume full responsibility for the forecast, yet the supplier guarantees the availability of the forecasted quantity and extra buffer inventory. In contrast, the price‐only discount contract places full inventory burden on the buyer. We show that the proposed QFi contract effectively balances the inventory risk for both the buyer and the supplier considering both the QF and discount mechanisms. We also show that the QFi contract is able to achieve supply chain coordination. More importantly, the QFi contract's coordinating price scheme does not require knowledge of demand distribution. We identify areas where the buyer and supplier may both benefit from implementing the QFi contract as opposed to the extant QF or price‐only (wholesale) discount contractual decisions in a decentralized supply chain. We also specify the conditions under which supply chain coordination can be achieved in a win‐win manner. We conclude with managerial implications and provide directions for future research.