Almost Mirror Image: Exploring the Similarities and Dissimilarities of Identical Twins in Theatrical Solo Performance Is an exploration of the psyche of identical twins within the context of devised solo performance. The author, an identical twin herself, has long been interested in twins' ability to cultivate both highly independent personalities as well as intensely co-dependent tendencies during development. What can twins tell us about the way we create close relationships and how is their upbringing radically different from the majority of the world that is born alone? Equally intrigued by society's growing technological dependence, the author would like to delve into how the science and development of twins appears counterintuitive to the intra-personal technological world they grow up in by using personal, autobiographic solo performance as her research platform. The data collected from research sources such as Jo Bonney's Extreme Exposure and Michael Kearns' The Solo Performer's Journey, will provide fodder for the thesis document and the author's devised solo piece, entitled Teach me how to be Lonely. While devising her own solo performance, the author will compare and contrast her process with that of a few select solo performers such as Anna Deavere Smith and Rachel Rosenthal. The author will delve into various styles of solo work creation, including the testimony plays of Smith and the autobiographical style of Rosenthal, in order to view her own work with a self-reflective and identity-driven lens. Overall, the author hopes to achieve a more comprehensive understanding of her own experience as an identical twin through the facilitation of her solo work as well as explore how the creation of solo performance can offer artists in the 21st century more freedom of expression and identity than the performance of a standard play.

Executive functioning (EF) facilitates a wide range of purposeful actions and plays a significant role in adaptive functioning. Despite considerable variability in EF, little is known about the factors underlying individual differences in EF in early childhood. The aims of the present research were to explore the genetic and environmental influences on individual differences in EF and the factors underlying the relations between EF and developmentally-significant outcomes. The sample comprised 209 4-year-old twin pairs (79 monozygotic, 130 dizygotic). EF was assessed with the NIH Toolbox: Early Childhood Cognitive Battery, a computerized battery of multidimensional measures. Both observers and parents provided ratings of temperament and parents evaluated behavior problems. School readiness was assessed with a standardized test of basic skills. Model-fitting procedures revealed that variability in set-shifting and inhibitory control could be attributed to both genetic (i.e., 36% and 46%, respectively) and nonshared environmental (i.e., 64% and 54%, respectively) influences. A moderate phenotypic association (r=.30) was found between set-shifting and inhibitory control. Multivariate behavioral genetic models revealed that approximately 85% of the genetic effects on inhibitory control covaried with set-shifting. Set-shifting and inhibitory control were associated with observer-rated task orientation (rs= .29 and .26, respectively) and school readiness (rs= .33 and .34, respectively). Both task orientation and school readiness were heritable (h2= 28% and 82%, respectively) and the correlations between both set-shifting and inhibitory control and these outcomes were due to common genetic influences. Parent-rated temperament was not associated with EF, but a related construct, effortful control, was inversely related to hyperactivity and externalizing behavior problems (rs= -.46 and -.41, respectively). Genetic and environmental factors underlie these associations. These findings indicate that both facets of EF share common genetic underpinnings and that these effects also underlie their associations with developmental outcomes. The present study contributes novel information about the etiology of early EF, with implications for cognitive, socio-emotional, and behavioral development, and ultimately, prevention and intervention efforts.

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Ports are actively pursuing greater operational efficiency to effectively handle the increasing global flow of goods, while striving to improve the energy efficiency of their operations to comply with new environmental regulations. As a result, innovation-leading ports have begun to recognize the potential of digital twins to overview, coordinate and optimize port processes, resulting in energy savings, and reductions of costs and of CO2 emissions. While digital twins have gained momentum in other domains such as smart manufacturing and aerospace, their adoption in ports has been comparatively slow. This can be explained, among other things, by the multi-stakeholder nature of the port and the high complexity of the often interconnected port processes. Thus, this thesis, grounded in the context of ports, discusses what constitutes a digital twin, proposes characteristics to assess the maturity of existing digital twins, and introduces and evaluates mathematical models to support a key port process, which can be used as components of a digital twin for the port. The thesis is composed of three papers:  Paper 1 is based on an extensive literature review, through which digital twins among different domains are studied in depth in order to transfer insights from these to the port domain. The resulting discussion of what constitutes a port’s digital twin and the requirements that a port’s digital twin must fulfil, together with a discussion of use cases of how port digital twins can contribute to energy savings, form the basis of Paper 1.  Paper 2 discusses how digital twins’ maturity can be assessed within six maturity levels and presents milestones for their implementation. Notably, Interoperability is identified as the highest maturity level, as the numerous stakeholders and their respective digital twins must work together to reach a coordinated system of systems performance. Using this assessment demonstrates that only a few innovation-leading ports have developed sophisticated digital twinning solutions so far.  Paper 3 is dedicated to coordinating container retrieval with stacking, combining two key port operations. Thus, it can present a key modeling component of a port digital twin, considering jointly the goals of reducing the energy demanding crane movements, as well as keeping schedules tight to avoid port congestion issues. This is directly reflecting the potentially conflicting perspectives of different stakeholders in the port context. The provided optimization model and algorithm show that jointly addressing both problems may lead to a reduced efficiency of both individual objectives, but from a systems perspective, leads to a higher overall port efficiency. / Hamnar strävar aktivt efter ökad operativ effektivitet för att hantera den ökande globala varuflödet, samtidigt som de strävar efter att förbättra energieffektiviteten. Som ett resultat har ledande hamnar börjat se potentialen hos digitala tvillingar för att skapa överblick samt koordinera och optimera processer i hamnen. Målet med användningen av digitala tvillingar är energibesparingar samt minskning av kostnader och CO2-utsläpp. Medan digitala tvillingar har använts inom andra områden såsom tillverknings-, flyg- och rymdindustrin, har införandet i hamnar varit jämförelsevist långsamt. Detta kan förklaras, bland annat, av hamnens många olika involverade aktörer och den höga komplexiteten i de ofta sammanlänkade hamnprocesserna. Därför fokuserar denna avhandling, med utgångspunkt i hamnkontexten, vad som utgör en digital tvilling, presenterar egenskaper för olika mognadsnivåer hos befintliga digitala tvillingar, och introducerar samt utvärderar matematiska modeller som kan bli delkomponenter i en digital tvilling för hamnen. Avhandlingen består av tre artiklar: Artikel 1 bygger på en omfattande litteraturöversikt, inom vilken digitala tvillingar för olika områden studeras ingående för att överföra insikter från dessa till hamndomänen. Detta resulterar i en presentation av vad som utgör en hamns digitala tvilling och de krav som en hamns digitala tvilling måste uppfylla, tillsammans med en diskussion om möjliga sett på vilka hur hamnens digitala tvillingar kan bidra till energibesparingar. Artikel 2 presenterar ett ramverk för hur mognaden hos digitala tvillingar kan bedömas baserat på sex mognadsnivåer och presenterar milstolpar för deras implementering. Noterbart är att interoperabilitet identifieras som den högsta mognadsnivån, eftersom de många intressenterna och deras respektive digitala tvillingar måste koordineras för att nå en fungerande system-av-systemnviå. Genom att använda denna bedömning visar det sig att endast några få innovationsledande hamnar hittills har utvecklat sofistikerade digitala tvillinglösningar. Artikel 3 fokuserar på koordinering av containerupphämtning koordinerat med staplings effektivitet, två viktiga hamnaktivieter. Därför representerar dessa en viktig modelleringskomponent i en hamns digitala tvilling, med beaktande av målen att minska de energikrävande kranrörelse, samt behovet av att hålla planerade tider för att undvika trängsel och väntan. Detta speglar direkt de potentiellt konfliktfyllda perspektiven hos olika intressenter i hamnkontexten. Den utvecklade optimeringsmodellen och algoritmen visar att gemensam hantering av båda dessa problemen kan leda till en minskad effektivitet för de respektive individuella målen, men en ökad effektivitet från ett systemperspektiv för hamnen som helhet.

Digital twins (DT) describe the integration of the physical and digital worlds with the aim of optimizing real world operations and functions. The digital twin concept has gained increasing attention across industries in the past decade including the building sector. However digital twins remain ambiguous with various existing definitions and characteristics. While DTs include all life cycle phases, ultimately their goal is optimization of operations during the use phase. Of the building life cycle phases, building facilities management (FM) is responsible for considerable costs and energy consumption and has potential for improvement through DT implementation. Along with increased building information modeling (BIM) implementation, recent advances in data driven technologies have encouraged the exploration of DT in the building sector. BIM has been coupled with technologies such as internet of things (IoT), data analytics, and cloud computing to optimize various FM functions often resembling DT. This study has reviewed existing literature on digital twins in facilities management using a structured literature review and characterized similar characteristics and definitions by different authors. Additionally, DT implementation in different FM application areas was quantified and analyzed. Results show that DT implementation in FM is still at nascent stages with major challenges surrounding standardization and data integration. / Master of Science / Digital twins (DT) describe the integration of the physical and digital worlds with the aim of optimizing real world operations and functions. The digital twin concept has gained increasing attention across industries in the past decade including the building sector. However digital twins remain ambiguous with various existing definitions and characteristics. DTs include all building life cycle phases from design, construction, to operation and maintenance. Ultimately their goal is optimization of operations also referred to as facilities management during the use phase. Of the building life cycle phases, building facilities management (FM) is responsible for considerable costs and energy consumption and has potential for improvement through DT implementation. Building information modeling (BIM) describes geometric and semantic information of physical assets and has been used to optimize operations in FM. Along with increased BIM implementation, recent advances in data driven technologies have encouraged the exploration of DT in the building sector. BIM has been coupled with technologies such as internet of things (IoT), data analytics, and cloud computing to optimize various FM functions often resembling DT. This study has reviewed existing literature on digital twins in facilities management using a structured literature review and characterized similar characteristics and definitions by different authors. Additionally, DT implementation in different FM application areas was quantified and analyzed. Results show that DT implementation in FM is still at nascent stages with major challenges surrounding standardization and data integration.

In this thesis, return to health is also estimated. We examine the effects of height on hourly wage, monthly earnings, working hours, and education level. Our results show that height has different causal impacts on women and men. Women benefit from height: taller women earn more, work less, and have more leisure time. However, taller men are more likely to land a job and work longer, largely because they are better endowed. Moreover, the positive effect of height on hourly wage for women is larger than that for men. In general, the findings have contributed new evidence to existing literature that estimates the return to health. / This thesis mainly investigates the intergenerational transmission of socioeconomic status. Specifically, it estimates the effects of family income and parental education on the health status and educational attainment of the next generation using unique twins data collected from urban China. By using twins strategy, we can largely control for unobservables, which may cause biases in estimations. Our results show that the positive correlations of family income and maternal education with child health are largely due to unobserved endowment and family background. However, family income and paternal education do have a positive effect on child education. Overall, our findings suggest that increasing family income and parental schooling do not help in improving child health. However, to reduce the educational gap of the next generation, redistributing income would prove beneficial. The design of government policies is dependent on the policy targets. / Xiong, Yanyan. / Advisers: Hongbin Li; Junsen Zhang. / Source: Dissertation Abstracts International, Volume: 70-06, Section: A, page: 2176. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2008. / Includes bibliographical references. / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. Ann Arbor, MI : ProQuest dissertations and theses, [201-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstracts in English and Chinese. / School code: 1307.