31 research outputs found

    Stages, Skills, and Steps of Archetypal Pattern Analysis

    Get PDF

    Understanding systems thinking:an agenda for applied research in industry

    Get PDF
    Why systems thinking is valuable is relatively easy to explain.  However, in the authors’ work as university educators, teaching a student processes of enquiry that are themselves systemic is a difficult undertaking.  The capacity to view the world in systemic ways seems an innate characteristic that some individuals possess.  Might it be the case that being a systems thinker is dependent on holding a particular worldview?  Systems theorists have evolved tools and methodologies to help people do systems thinking.  Is being a user of systems methods the same as being a systems thinker? Are certain cognitive competencies, styles, or preferences required for people to make effective use of such tools and methodologies

    Methanol maser associated outflows: detection statistics and properties

    Get PDF
    We have selected the positions of 54 6.7 GHz methanol masers from the Methanol Multibeam Survey catalogue, covering a range of longitudes between 20° and 34° of the Galactic plane. These positions were mapped in the J = 3-2 transition of both the 13CO and C18O lines. A total of 58 13CO emission peaks are found in the vicinity of these maser positions. We search for outflows around all 13CO peaks, and find evidence for high-velocity gas in all cases, spatially resolving the red and blue outflow lobes in 55 cases. Of these sources, 44 have resolved kinematic distances, and are closely associated with the 6.7 GHz masers, a subset referred to as Methanol Maser Associated Outflows (MMAOs). We calculate the masses of the clumps associated with each peak using 870 mum continuum emission from the ATLASGAL survey. A strong correlation is seen between the clump mass and both outflow mass and mechanical force, lending support to models in which accretion is strongly linked to outflow. We find that the scaling law between outflow activity and clump masses observed for low-mass objects, is also followed by the MMAOs in this study, indicating a commonality in the formation processes of low-mass and high-mass stars

    UWISH2 -- The UKIRT Widefield Infrared Survey for H2

    Get PDF
    We present the goals and preliminary results of an unbiased, near-infrared, narrow-band imaging survey of the First Galactic Quadrant (10deg<l<65deg ; -1.3deg<b<+1.3deg). This area includes most of the Giant Molecular Clouds and massive star forming regions in the northern hemisphere. The survey is centred on the 1-0S(1) ro-vibrational line of H2, a proven tracer of hot, dense molecular gas in star-forming regions, around evolved stars, and in supernova remnants. The observations complement existing and upcoming photometric surveys (Spitzer-GLIMPSE, UKIDSS-GPS, JCMT-JPS, AKARI, Herschel Hi-GAL, etc.), though we probe a dynamically active component of star formation not covered by these broad-band surveys. Our narrow-band survey is currently more than 60% complete. The median seeing in our images is 0.73arcsec. The images have a 5sigma detection limit of point sources of K=18mag and the surface brightness limit is 10^-19Wm^-2arcsec^-2 when averaged over our typical seeing. Jets and outflows from both low and high mass Young Stellar Objects are revealed, as are new Planetary Nebulae and - via a comparison with earlier K-band observations acquired as part of the UKIDSS GPS - numerous variable stars. With their superior spatial resolution, the UWISH2 data also have the potential to reveal the true nature of many of the Extended Green Objects found in the GLIMPSE survey.Comment: 14pages, 8figures, 2tables, accepted for publication by MNRAS, a version with higher resolution figures can be found at http://astro.kent.ac.uk/~df

    Sulphur chemistry in the envelopes of massive young stars

    Full text link
    The sulphur chemistry in nine regions in the earliest stages of high-mass star formation is studied through single-dish submillimeter spectroscopy. The line profiles indicate that 10-50% of the SO and SO2 emission arises in high-velocity gas, either infalling or outflowing. For the low-velocity gas, excitation temperatures are 25 K for H2S, 50 K for SO, H2CS, NS and HCS+, and 100 K for OCS and SO2, indicating that most observed emission traces the outer parts (T<100 K) of the molecular envelopes, except high-excitation OCS and SO2 lines. Abundances in the outer envelopes, calculated with a Monte Carlo program, using the physical structures of the sources derived from previous submillimeter continuum and CS line data, are ~10^-8 for OCS, ~10^-9 for H2S, H2CS, SO and SO2, and ~10^-10 for HCS+ and NS. In the inner envelopes (T>100 K) of six sources, the SO2 abundance is enhanced by factors of ~100-1000. This region of hot, abundant SO2 has been seen before in infrared absorption, and must be small, <~ 0.2 arcsec (180 AU radius). The derived abundance profiles are consistent with models of envelope chemistry which invoke ice evaporation at T~100$ K. Shock chemistry is unlikely to contribute. A major sulphur carrier in the ices is probably OCS, not H2S as most models assume. The source-to-source abundance variations of most molecules by factors of ~10 do not correlate with previous systematic tracers of envelope heating. Without observations of H2S and SO lines probing warm (>~ 100 K) gas, sulphur-bearing molecules cannot be used as evolutionary tracers during star formation.Comment: Accepted by A&A, 14 pages, 5 figure

    Applying OR to problem situations within community organisations: a case in a Danish non-profit, member-driven food cooperative

    Get PDF
    This paper focuses on how the use of Community OR (COR), specifically Systems Thinking (ST) and the Viable System Model (VSM) can help in addressing complex and uncertain problem situations within community organisations, in particular Alternative Food Networks (AFNs). Literature has highlighted the importance and benefits of AFNs, but also the complexity and uncertainty underpinning the majority of AFN related problem situations that limit decision making and strategic planning and threaten the long-term sustainability of AFNs. To address this issue, we discuss the use of ST via a VSM intervention within a member-driven food cooperative in Copenhagen, Denmark, and the changes in decision making and the organisational structure of the cooperative. We illustrate the application of the VSM and in particular the methodology for organisational self-transformation within ‘localist green communitarianism’ and ‘nonprofit management’ to tackle issues, enhance democratic and participative decision making, and changes in the organisational structure that foster coordination and cohesion. The implications for COR and Soft OR, limitations and future research directions are also provided

    Finishing the euchromatic sequence of the human genome

    Get PDF
    The sequence of the human genome encodes the genetic instructions for human physiology, as well as rich information about human evolution. In 2001, the International Human Genome Sequencing Consortium reported a draft sequence of the euchromatic portion of the human genome. Since then, the international collaboration has worked to convert this draft into a genome sequence with high accuracy and nearly complete coverage. Here, we report the result of this finishing process. The current genome sequence (Build 35) contains 2.85 billion nucleotides interrupted by only 341 gaps. It covers ∌99% of the euchromatic genome and is accurate to an error rate of ∌1 event per 100,000 bases. Many of the remaining euchromatic gaps are associated with segmental duplications and will require focused work with new methods. The near-complete sequence, the first for a vertebrate, greatly improves the precision of biological analyses of the human genome including studies of gene number, birth and death. Notably, the human enome seems to encode only 20,000-25,000 protein-coding genes. The genome sequence reported here should serve as a firm foundation for biomedical research in the decades ahead

    Intervening in Counterproductive Self-Organized Dynamics in the Workplace

    No full text
    Self-organization can generate unintended systemic patterns of behaviour in corporate settings. Such patterns can be difficult to detect for several reasons. Among them is the tendency for self-organization to emerge spontaneously, without planning or intentional design (a tendency running contrary to the expectations of intentionality and control prevalent in workplaces). Self-organization also unfolds dynamically, involving repetitive behaviours that are, paradoxically, unpredictable. Self-organization also entrains people’s behaviour in patterns, making it difficult for those people to recognize the patterns to which they themselves are contributing. These factors and others make self-organization difficult to recognize. However, because self-organized patterns can confound the best-laid plans of business leaders, allowing self-organized patterns to unfold unimpeded may not be acceptable to organizational leaders. Drawing from an international grounded theory study of workplace pattern identification, this article examines the intervention options used by people working in organizations once they have identified a counterproductive self-organized dynamic. We also discuss obstacles to intervention and the ethical considerations raised by those wishing to intervene in self-organized workplace dynamics. The discovery of self-organized patterns could be a tremendous contribution to those charged with the responsibility of leading and working in organizations. Realizing this contribution depends on the coupling of pattern detection with appropriate and sound intervention strategies. This paper begins a series of articles that will explore intervention strategies from empirical and theoretical perspectives. This first article allows us to start an examination and development of epistemologically and psychologically appropriate interventions from a phenomenologically sound position

    Dancing in the white spaces: Exploring gendered assumptions in successful project managers' discourse about their work

    Full text link
    By design, bodies of knowledge capture and influence best working practices. Gendered assumptions based on masculine cognitive styles are predominant in the Guide to the Project Management Body of Knowledge (PMBOK) [PMI. Project Management Body of Knowledge. Project Management Institute 1996]. This study investigates the assumptions and cognitive styles embedded in successful project managers' discussions of their working practices. Both male and female project managers exhibit sophisticated skill in balancing masculine and feminine cognitive styles and attribute their success to "dancing in the white spaces" between the lines laid out by the PMBOK. This raises important questions about the role of the PMBOK in training and certifying project managers. A? 2007 Elsevier Ltd and IPMA
    corecore