"Shared sense of purposefulness": a new concept to understand the practice of coordinating design in construction

Construction management literature sees the collective task of coordinating design as being about the “‘integration’” of “fragmented” discipline-specific design tasks/outputs, thus overlooking the important role of social interactions. This is not only conceptually problematic but also presents a practical management problem. As a response, a practice-based approach, which relies on a “becoming” ontology, is adopted for a practical explanation of design coordination for more effective design management. The adopted methodology suggests that design develops as a result of unfolding (path-dependent) individual actions and interdisciplinary interactions. Based on this, the concept of a “shared sense of purposefulness” is proposed to refer to the temporary and precarious organizational state of a design team in which each of the interacting team members has achieved a state of purposefulness to resume individual action. Hence, design coordination in construction is redefined as continuously re-establishing and maintaining “a shared sense of purposefulness”. The concept’s usefulness for understanding the practice of design coordination is demonstrated using data collected from a project in the UK. The discussion enables fresh insights into the everyday operation of design coordination. It is concluded that the proposed conception paves a way forward both for the research and practice in construction design management

Value implication of digital transformation: the impact of the commodification of information

The transforming construction agenda argues that digitalization enables better value by addressing coordination challenges. However, this claim poorly articulates how value is constituted, and ignores the problems with digitalization in real-life practices. The paper presents a finer-grained analysis of the value implications of digitalization in a critical discourse, organized in two parts, using the two value creation logics in construction as proposed by Bygballe and Jahre and the concept of “commodification” as proposed by Prudham. Through a critical literature review, the first part argues that digitalization mainly supports “production value creation logic” focussing on the integration of business processes at an organizational level, while creating challenges for “project value creation logic” by hampering mutual adjustment in situated practices. The second part conceives of digitalization as “commodification of information” to expose the complex set of processes causing digitalization to impact differently on the two value creation logics. It reveals that digitalization elevates the digital exchange value of information above its situated use value, and so, it systematically shifts the social and business contexts of coordination. Thus, digitalization shifts what, how, by whom and to whose advantage, value is created and captured, making it a politicized change with implications for management and policy

Understanding the polarized perspectives in BIM enabled projects

Successful implementation and use of Building Information Modelling (BIM) require consideration of people issues. Two polarised views of BIM are shown from the literature based on technology-centred or human-centred perspectives each of which acknowledges the other but subsumes this into their view. Indeed it is the way that each adopts the other that is problematic. This paper demonstrates that acknowledging these differences and working with them better addresses the management of the implementation of BIM. Empirical findings, from in-depth interviews in a multi-disciplinary engineering company, show that individuals use BIM but are confused by its role depending on their job and perspective. Given this, collaboration and development are held back by the un-expressed differences. It is argued that recognising these differences and using them in a balanced way is essential for the successful adoption of BIM

Collaboration in BIM Enabled Design Projects: Effects of Interoperable Information Technologies

There is a growing awareness that the problematic nature of collaboration in construction design projects is further complicated by the use of interoperable information technologies (IT) in Building Information Modelling (BIM) enabled projects. Consequently, there is a need to better understand the ways interoperable IT get involved in inter-disciplinary relations and affect mutual engagement of different design members. Findings from the study of a BIM enabled design project are analysed using the concept of interdependencies in the interactions between practitioners and their organisations. The paper draws a distinction between “model interdependencies” and “design interdependencies” concerned with the IT and the design task respectively. This distinction helps to deal with the complex nature of practice by expressing the different needs people have in their task interactions using technology in organisations. It is concluded that the conflicts between model and design interdependencies cause segregation into separate model development and design development at the organisational level. Project organisations should be aware of this and take necessary social and technological precautions to achieve better design collaboration

BIM and conceptual design sustainability analysis: An information categorization framework

Sustainability in construction has attracted considerable attention from scholars as well as from regulatory bodies. However, early design stage sustainability analysis remains problematic because of the conflicting factors affecting sustainability, the limited and fragmented project data in hand and deficiencies of existing sustainability analysis software for quick evaluation of conceptual design alternatives. Building Information Modelling's (BIM) information management and integration capabilities present opportunities to support early design sustainability analysis. In this paper, early findings of an on-going BIM based early design sustainability analysis application development project are presented. Through literature review and in-depth interviews with a sustainability professional, an information categorization framework for quick evaluation of different conceptual design alternatives from a sustainability point of view is developed. The framework guides further stages of the application development project and also supports BIM Execution Planning for projects where holistic early design sustainability analysis is intended

Clinical and echocardiographic features of aorto-atrial fistulas

Aorto-atrial fistulas (AAF) are rare but important pathophysiologic conditions of the aorta and have varied presentations such as acute pulmonary edema, chronic heart failure and incidental detection of the fistula. A variety of mechanisms such as aortic dissection, endocarditis with pseudoaneurysm formation, post surgical scenarios or trauma may precipitate the fistula formation. With increasing survival of patients, particularly following complex aortic reconstructive surgeries and redo valve surgeries, recognition of this complication, its clinical features and echocardiographic diagnosis is important. Since physical exam in this condition may be misleading, echocardiography serves as the cornerstone for diagnosis. The case below illustrates aorto-left atrial fistula formation following redo aortic valve surgery with slowly progressive symptoms of heart failure. A brief review of the existing literature of this entity is presented including emphasis on echocardiographic diagnosis and treatment

Observation of Spontaneous Brillouin Cooling

While radiation-pressure cooling is well known, the Brillouin scattering of light from sound is considered an acousto-optical amplification-only process. It was suggested that cooling could be possible in multi-resonance Brillouin systems when phonons experience lower damping than light. However, this regime was not accessible in traditional Brillouin systems since backscattering enforces high acoustical frequencies associated with high mechanical damping. Recently, forward Brillouin scattering in microcavities has allowed access to low-frequency acoustical modes where mechanical dissipation is lower than optical dissipation, in accordance with the requirements for cooling. Here we experimentally demonstrate cooling via such a forward Brillouin process in a microresonator. We show two regimes of operation for the Brillouin process: acoustical amplification as is traditional, but also for the first time, a Brillouin cooling regime. Cooling is mediated by an optical pump, and scattered light, that beat and electrostrictively attenuate the Brownian motion of the mechanical mode.Comment: Supplementary material include

Electromagnetically Induced Transparency and Slow Light with Optomechanics

Controlling the interaction between localized optical and mechanical excitations has recently become possible following advances in micro- and nano-fabrication techniques. To date, most experimental studies of optomechanics have focused on measurement and control of the mechanical subsystem through its interaction with optics, and have led to the experimental demonstration of dynamical back-action cooling and optical rigidity of the mechanical system. Conversely, the optical response of these systems is also modified in the presence of mechanical interactions, leading to strong nonlinear effects such as Electromagnetically Induced Transparency (EIT) and parametric normal-mode splitting. In atomic systems, seminal experiments and proposals to slow and stop the propagation of light, and their applicability to modern optical networks, and future quantum networks, have thrust EIT to the forefront of experimental study during the last two decades. In a similar fashion, here we use the optomechanical nonlinearity to control the velocity of light via engineered photon-phonon interactions. Our results demonstrate EIT and tunable optical delays in a nanoscale optomechanical crystal device, fabricated by simply etching holes into a thin film of silicon (Si). At low temperature (8.7 K), we show an optically-tunable delay of 50 ns with near-unity optical transparency, and superluminal light with a 1.4 microseconds signal advance. These results, while indicating significant progress towards an integrated quantum optomechanical memory, are also relevant to classical signal processing applications. Measurements at room temperature and in the analogous regime of Electromagnetically Induced Absorption (EIA) show the utility of these chip-scale optomechanical systems for optical buffering, amplification, and filtering of microwave-over-optical signals.Comment: 15 pages, 9 figure

A genome-wide linkage study of mammographic density, a risk factor for breast cancer

Abstract Introduction Mammographic breast density is a highly heritable (h2 > 0.6) and strong risk factor for breast cancer. We conducted a genome-wide linkage study to identify loci influencing mammographic breast density (MD). Methods Epidemiological data were assembled on 1,415 families from the Australia, Northern California and Ontario sites of the Breast Cancer Family Registry, and additional families recruited in Australia and Ontario. Families consisted of sister pairs with age-matched mammograms and data on factors known to influence MD. Single nucleotide polymorphism (SNP) genotyping was performed on 3,952 individuals using the Illumina Infinium 6K linkage panel. Results Using a variance components method, genome-wide linkage analysis was performed using quantitative traits obtained by adjusting MD measurements for known covariates. Our primary trait was formed by fitting a linear model to the square root of the percentage of the breast area that was dense (PMD), adjusting for age at mammogram, number of live births, menopausal status, weight, height, weight squared, and menopausal hormone therapy. The maximum logarithm of odds (LOD) score from the genome-wide scan was on chromosome 7p14.1-p13 (LOD = 2.69; 63.5 cM) for covariate-adjusted PMD, with a 1-LOD interval spanning 8.6 cM. A similar signal was seen for the covariate adjusted area of the breast that was dense (DA) phenotype. Simulations showed that the complete sample had adequate power to detect LOD scores of 3 or 3.5 for a locus accounting for 20% of phenotypic variance. A modest peak initially seen on chromosome 7q32.3-q34 increased in strength when only the 513 families with at least two sisters below 50 years of age were included in the analysis (LOD 3.2; 140.7 cM, 1-LOD interval spanning 9.6 cM). In a subgroup analysis, we also found a LOD score of 3.3 for DA phenotype on chromosome 12.11.22-q13.11 (60.8 cM, 1-LOD interval spanning 9.3 cM), overlapping a region identified in a previous study. Conclusions The suggestive peaks and the larger linkage signal seen in the subset of pedigrees with younger participants highlight regions of interest for further study to identify genes that determine MD, with the goal of understanding mammographic density and its involvement in susceptibility to breast cancer