Integrated optics for nulling interferometry in the thermal infrared: progress and recent achievements

The search for Earth-like exoplanets, orbiting in the habitable zone of stars other than our Sun and showing biological activity, is one of the most exciting and challenging quests of the present time. Nulling interferometry from space, in the thermal infrared, appears as a promising candidate technique for the task of directly observing extra-solar planets. It has been studied for about 10 years by ESA and NASA in the framework of the Darwin and TPF-I missions respectively. Nevertheless, nulling interferometry in the thermal infrared remains a technological challenge at several levels. Among them, the development of the "modal filter" function is mandatory for the filtering of the wavefronts in adequacy with the objective of rejecting the central star flux to an efficiency of about 105. Modal filtering takes benefit of the capability of single-mode waveguides to transmit a single amplitude function, to eliminate virtually any perturbation of the interfering wavefronts, thus making very high rejection ratios possible. The modal filter may either be based on single-mode Integrated Optics (IO) and/or Fiber Optics. In this paper, we focus on IO, and more specifically on the progress of the on-going "Integrated Optics" activity of the European Space Agency.

A survey of multi-fingered robot hands: issues and grasping achievements

Recently a substantial amount of research has been done in the field of dextrous manipulation and hand manoeuvres. The main concern has been how to control robot hands so that they can execute manipulation tasks with the same dexterity and intuition as human hands. This paper surveys multi-fingered robot hand research and development topics which include robot hand design, object force distribution and control, grip transform, grasp stability and its synthesis, grasp stiffness and compliance motion and robot arm-hand coordination. Three main topics are presented in this article. The first is an introduction to the subject. The second concentrates on examples of mechanical manipulators used in research and the methods employed to control them. The third presents work which has been done on the field of object manipulation.

Sustained monitoring of the Southern Ocean at Drake Passage: past achievements and future priorities

Drake Passage is the narrowest constriction of the Antarctic Circumpolar Current (ACC) in the Southern Ocean, with implications for global ocean circulation and climate. We review the long-term sustained monitoring programmes that have been conducted at Drake Passage, dating back to the early part of the twentieth century. Attention is drawn to numerous breakthroughs that have been made from these programmes, including (a) the first determinations of the complex ACC structure and early quantifications of its transport; (b) realization that the ACC transport is remarkably steady over interannual and longer periods, and a growing understanding of the processes responsible for this; (c) recognition of the role of coupled climate modes in dictating the horizontal transport, and the role of anthropogenic processes in this; (d) understanding of mechanisms driving changes in both the upper and lower limbs of the Southern Ocean overturning circulation, and their impacts. It is argued that monitoring of this passage remains a high priority for oceanographic and climate research, but that strategic improvements could be made concerning how this is conducted. In particular, long-term programmes should concentrate on delivering quantifications of key variables of direct relevance to large-scale environmental issues: in this context, the time-varying overturning circulation is, if anything, even more compelling a target than the ACC flow. Further, there is a need for better international resource-sharing, and improved spatio-temporal coordination of the measurements. If achieved, the improvements in understanding of important climatic issues deriving from Drake Passage monitoring can be sustained into the future.

Can we predict when “dying” will be difficult?: Progressive achievements in L2 English

A large body of research has focused on the observation that second language (L2) learners are limited in their production of temporal and aspectual forms. For example, in L2 English, it has been shown learners use progressive marking with activity verbs and only rarely extend the form to telic verb phrases such as accomplishments or achievements (Bardovi-Harlig and Reynolds, 1995; Bardovi-Harlig, 2000; Robison, 1995). Shirai and Andersen (1995) proposed that activities represent the prototype for the category of progressive aspect and learners generally acquire the prototype first. However, very little research has focused explicitly on advanced learners to see if they eventually extend beyond the prototype. In addition, properties of the native language have not systematically been taken into account. Achievements such as "die" are especially interesting in that they interact differently with markers of progressive aspect across languages. The present study investigated the acquisition of progressive achievements in English by native speakers of Chinese and Korean in order to examine whether there is evidence of universal difficulty, as would be predicted by the prototype account, or whether similarity between the L1 and L2 (as in the case of English and Korean) can facilitate acquisition, as would be predicted by transfer. Our results suggest that the properties of the native language play an important role, supporting the transfer account. However, neither L1 group performs at the level of native speakers. We argue that the acquisition of aspect is influenced by both the properties of the native language and the semantic and pragmatic complexity of the target computation.

The TIGGE project and its achievements

TIGGE was a major component of the THORPEX (The Observing System Research and Predictability Experiment) research program, whose aim is to accelerate improvements in forecasting high-impact weather. By providing ensemble prediction data from leading operational forecast centers, TIGGE has enhanced collaboration between the research and operational meteorological communities and enabled research studies on a wide range of topics. The paper covers the objective evaluation of the TIGGE data. For a range of forecast parameters, it is shown to be beneficial to combine ensembles from several data providers in a Multi-model Grand Ensemble. Alternative methods to correct systematic errors, including the use of reforecast data, are also discussed. TIGGE data have been used for a range of research studies on predictability and dynamical processes. Tropical cyclones are the most destructive weather systems in the world, and are a focus of multi-model ensemble research. Their extra-tropical transition also has a major impact on skill of mid-latitude forecasts. We also review how TIGGE has added to our understanding of the dynamics of extra-tropical cyclones and storm tracks. Although TIGGE is a research project, it has proved invaluable for the development of products for future operational forecasting. Examples include the forecasting of tropical cyclone tracks, heavy rainfall, strong winds, and flood prediction through coupling hydrological models to ensembles. Finally the paper considers the legacy of TIGGE. We discuss the priorities and key issues in predictability and ensemble forecasting, including the new opportunities of convective-scale ensembles, links with ensemble data assimilation methods, and extension of the range of useful forecast skill.

Race, identity and education achievements among Arab-Australian students

This paper discusses the challenge of managing cultural diversity in secondary schools, focusing on key structural, ideological, cultural, attitudinal and identity factors affecting the educational experiences and outcomes of Australian students from Arabic-speaking background (ASB). Recent research indicates that there are complex processes at play that hinder the ability of non English-speaking background (NESB) students to access constructive and meaningful education, and that such processes need further systematic investigation. It has also been argued that Australian schools are failing the test of social equity and that the dominant approach to curriculum and pedagogy does not meet the needs of the growing numbers of students from divergent cultural and socio-economic backgrounds. This paper focuses on identifying the social, cultural and attitudinal factors that affect the educational achievements of ASB students within a broad multidimensional approach to multicultural education. By linking thorough empirical research and innovative theory with practical, tested plans of action, this study proposes an in-principled approach to multicultural education that is extendable to a variety of schooling contexts while retaining its core focus on effecting positive learning outcomes. The key objectives of the larger study upon which this paper is based are to (a) address the disadvantages and barriers faced by NESB young people, particularly ASB young people, in achieving positive educational outcomes; (2) increase their chances for better life opportunities and self fulfilment; and (3) develop a good practice model for diversity management in Victorian schools. This latter objective will complement Victorian Government policies on cultural diversity and multicultural education.

Economic evaluation of a skin cancer prevention program in Australia : past achievements and future prospects

Objectives
Australia has the highest incidence of skin cancer in the world. Skin cancer prevention campaigns have been implemented in Australia for over two decades. The most notable is under the brand name, SunSmart. The aim of the current study is to assess the cost-effectiveness of SunSmart in the past and the potential cost-effectiveness of an ongoing national SunSmart program with optimal investment in the future.

Methods
An economic evaluation from a health sector perspective was conducted using the reduction in skin cancer incidence attributable to the SunSmart program modelled as the primary end-point. Historical SunSmart program expenditures were obtained from three representative states in three latitude zones, covering different levels of UVR exposure. Melanoma incidence rates from the three representative state cancer registers were used to model the health outcomes. Program effectiveness was assessed by the comparison between the well-resourced SunSmart state (Victoria) and the under-invested states (New South Wales and Queensland). Non-Melanoma Skin Cancer (NMSC) was modelled based on national survey results. 2003 was chosen as the reference year and future costs/outcomes over a 20 year time horizon were discounted at 3%.
The future level of investment in a national SunSmart was chosen to strengthen current practice by increasing current investment to a realistic and achievable level. This conservative increase in investment (expressed as ‘$ per capita’) reflected the investment level that has been achieved in Victoria over sustained periods. To model the potential cost-effectiveness of an upgraded national SunSmart program, a conservative approach was taken, whereby the same magnitude of effectiveness from 1988 to 2003 was applied to future skin cancer incidence.

Results
SunSmart in Victoria has saved 22,300 life-years, averted 27,900 disability-adjusted life-years(DALYs)(discounted) since its introduction in 1988 and achieved an incremental cost-effectiveness ratio (ICER) of $AUD 680 per life-year saved (LYS) and $AUD 540 per DALY averted. When the cost-offset from the estimated reduction in skin cancer treatment costs were taken into account, SunSmart achieved ‘dominance’. The net cost of SunSmart in the past was an estimated saving of $AUD 93 million. An upgraded national SunSmart for the next 20 years would save 91,000 life-years and avert 122,000 DALYs (discounted), involving an increased investment level from the current $AUD 0.07 per capita to the historical average of $AUD 0.28 per capita. The ICER for the upgraded SunSmart program was estimated at $AUD 940 per LYS and $AUD 700 per DALY averted. When the cost-offset is included, the program achieves dominance with a cost saving of $AUD 115 million – an estimated $AUD 2.32 return for every dollar invested between 2003 and 2022.

Conclusions
This study demonstrates that a sustained modest investment in skin cancer control is likely to be excellent value-for-money. While the available data base is certainly not prefect, key parameters would have to change dramatically for this conclusion to be challenged.

China's 'two Koreas' policy : achievements and contradictions

China has long maintained a keen interest in events on the Korean peninsula, which Beijing considers to fall within the Sinic sphere of interest. The PRC has maintained a decades-long alliance with North Korea, and also achieved a rapprochement with South Korea, with whom China enjoys a burgeoning economic relationship. The PRC’s pursuit of a ‘two Koreas’ policy has tested Beijing’s diplomatic mettle during the past decade. In and of itself, the maintenance of strong ties to both Koreas represents a significant achievement. By reviewing recent developments in Chinese diplomacy towards the peninsula, this article highlights both the achievements and contradictions inherent in Beijing’s two-Korea policy. North Korea has risked China’s wrath by pursuing a nuclear deterrent, and by refusing to enact market reforms. In the case of the South, the government of Lee Myung-bak has strengthened its alliance with the U.S. and also sought to compensate for its growing economic interdependence with China by seeking FTAs with other states, including the U.S. The sinking of the Cheonan in March 2010 presents an opportunity to reflect on China’s efforts to balance its ties with both Koreas.

Hats of affect : a study of affect, achievements and hats in Team Fortress 2

An iconic staple of the First-Person Shooter genre, Team Fortress 2 , is popular for its chaotic action, distinguished by its painterly aesthetics, and made unique by the introduction of hats as rewards for its players. This study investigates the intersection of virtual millinery items, player achievements, user generated content and the implications for online gamer personas as they are connected to the digital distribution platform, Steam. The article examines the iterations of affect involved in the design and play of a game no longer imagined by its publisher, the Valve Corporation, as a distinct commodity but rather a commercial community service.

Democratic consolidation in Timor-Leste: achievements, problems and prospects

Timor-Leste has had three rounds of major elections, all of which have been widely regarded as meeting international criteria for being free and fair. There has also been one change of government on the basis of these elections. On these grounds, some observers have suggested that Timor-Leste has met the benchmark for having consolidated its democracy. Timor-Leste can be said to meet the criteria for an expanded minimalist definition of democracy, holding regular, free and fair elections within an open competitive political environment, with relatively little violence and intimidation and general freedom of expression. This political process has, as defined by the literature, also consolidated. However, Timor-Leste continues to face future economic challenges. The literature indicates that states with high levels of poverty, unemployment and with food shortages are more prone to political instability. Given that Timor-Leste's political party system relies heavily on charismatic individuals and, apart from Fretilin, has poor party structures, loss of current political leaders will add a further destabilising effect. Expected economic problems are likely to manifest around the same time that the current generation of political leaders are no longer active. The question will be, in this increasingly challenging environment, whether Timor-Leste can sustain its democracy.