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- 저자 : Tony Ma (검색결과 6 건)
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Exploratory Investigation of Scope Management for a BIM-enabled Construction Project
Ki Pyung Kim(Ki Pyung Kim),Tony Ma(Tony Ma ),John Biddiss(John Biddiss ) KINFORMS 2023 Management Review Vol.18 No.1
Despite the recommendation of the international BIM standard ISO 19650, the current scope management process and practice for a BIM-enabled project need to be improved for the full benefits of the BIM adoption. Due to a lack of clarity in BIM-enabled project scope definition and roles and responsibilities for project key participants, unnecessary reworks and various change orders are occurred in the project execution phase. To minimise reworks and improve productivity, it is essential to understand the status of BIM-enabled project scope management practice. However, the current practice of scope management in a BIM-enabled project environment has been rarely studied. Thus, the research aims to identify the current scope management practice for BIM-enabled construction projects via interviews. It is revealed that the current scope definition process fails to provide clear roles and responsibilities for a BIM manager and a project manager separately. Additionally, the disconnection between the PIM and AIM causes ineffectiveness of utilising lessons learned for scope definition. The research findings will contribute to providing insights to improve the current scope management practice more suitable for a BIM-enabled project.
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Ma, Rui,Zhang, Huairuo,Yoo, Youngdong,Degregorio, Zachary Patrick,Jin, Lun,Golani, Prafful,Ghasemi Azadani, Javad,Low, Tony,Johns, James E.,Bendersky, Leonid A.,Davydov, Albert V.,Koester, Steven J. American Chemical Society 2019 ACS NANO Vol.13 No.7
<P>The coexistence of metallic and semiconducting polymorphs in transition-metal dichalcogenides (TMDCs) can be utilized to solve the large contact resistance issue in TMDC-based field effect transistors (FETs). A semiconducting hexagonal (2H) molybdenum ditelluride (MoTe<SUB>2</SUB>) phase, metallic monoclinic (1T′) MoTe<SUB>2</SUB> phase, and their lateral homojunctions can be selectively synthesized <I><I>in situ</I></I> by chemical vapor deposition due to the small free energy difference between the two phases. Here, we have investigated, in detail, the structural and electrical properties of <I>in situ</I>-grown lateral 2H/1T′ MoTe<SUB>2</SUB> homojunctions grown using flux-controlled phase engineering. Using atomic-resolution plan-view and cross-sectional transmission electron microscopy analyses, we show that the round regions of near-single-crystalline 2H-MoTe<SUB>2</SUB> grow out of a polycrystalline 1T′-MoTe<SUB>2</SUB> matrix. We further demonstrate the operation of MoTe<SUB>2</SUB> FETs made on these <I>in situ</I>-grown lateral homojunctions with 1T′ contacts. The use of a 1T′ phase as electrodes in MoTe<SUB>2</SUB> FETs effectively improves the device performance by substantially decreasing the contact resistance. The contact resistance of 1T′ electrodes extracted from transfer length method measurements is 470 ± 30 Ω·μm. Temperature- and gate-voltage-dependent transport characteristics reveal a flat-band barrier height of ∼30 ± 10 meV at the lateral 2H/1T′ interface that is several times smaller and shows a stronger gate modulation, compared to the metal/2H Schottky barrier height. The information learned from this analysis will be critical to understanding the properties of MoTe<SUB>2</SUB> homojunction FETs for use in memory and logic circuity applications.</P> [FIG OMISSION]</BR>
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Investigation of Readiness for 4D and 5D BIM Adoption in the Australian Construction Industry
Ki Pyung Kim,Tony Ma,Amanjot Sigh Baryah,Chujun Zhang,Ka Ming Hui KINFORMS 2016 Management Review Vol.11 No.2
As Building Information Modelling (BIM) is an enabler that can improve productivity of a construction project by facilitating collaboration among stakeholders, there has been an effort to promote BIM adoption in Australia, and yet the Australian construction industry is remained behind in adopting the BIM capabilities related to time (4D BIM) and cost management (5D BIM). In order to identify current barriers and potential recommendations for promoting BIM uptake, this research conducted a questionnaire survey and interviews focusing on 4D and 5D BIM adoption in the Australian construction industry. Consequently, it is identified that the Australian construction industry is not fully ready to embrace 4D and 5D BIM capabilities since basic 3D BIM capability related to 3D visualization is the main usage of BIM for construction projects. As major barriers, a lack of demand from clients for BIM use and high initial costs for BIM system setup are identified. More importantly, a lack of guidance to construct an information-enriched BIM model is recognized to move forward to the next level of BIM utilization such as 4D and 5D BIM capabilities. This research serves as a stepping-stone to study further to promoting BIM uptake in the Australian construction industry.
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Emerging Challenges and Roles for Quantity Surveyors in the Construction Industry
Shadi Shayan,Ki Pyung Kim,Tony Ma,Rob Freda,Zhuoran Liu KINFORMS 2019 Management Review Vol.14 No.1
The current ever-changing environment of the construction industry demands Quantity Surveyors to update their knowledge and skills to cope with the changes. In order to provide insights for Quantity Surveyors to be able to manage a construction project productively and increase their ability in accordance with the current demand of the construction industry, this research conduct a questionnaire survey and interviews. As a result, the most critical challenges for Quantity Surveyors are a) Adopting new technologies such as BIM for their current practice, and b) Increasing their knowledge regarding sustainable attributes for a construction project. This research also disclosed that the expected emerging roles for Quantity Surveyors are a) Sustainable Advisory ability, and b) BIM ability for cost management. The research findings are expected to advise the current Quantity Surveyor and Quantity Surveying companies to prepare future competencies in accordance with the global trend.
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Yoon, Young-Sil,Lee, Min-Woo,Ryu, Dongryeol,Kim, Jeong Ho,Ma, Hui,Seo, Woo-Young,Kim, Yo-Na,Kim, Su Sung,Lee, Chul Ho,Hunter, Tony,Choi, Cheol Soo,Montminy, Marc R,Koo, Seung-Hoi National Academy of Sciences 2010 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.107 No.41
<P>Fasting promotes hepatic gluconeogenesis to maintain glucose homeostasis. The cAMP-response element binding protein (CREB)-regulated transcriptional coactivator 2 (CRTC2) is responsible for transcriptional activation of gluconeogenic genes and is critical for conveying the opposing hormonal signals of glucagon and insulin in the liver. Here, we show that suppressor of MEK null 1 (SMEK1) and SMEK2 [protein phosphatase 4 (PP4) regulatory subunits 3a and 3b, respectively] are directly involved in the regulation of hepatic glucose metabolism in mice. Expression of hepatic SMEK1/2 is up-regulated during fasting or in mouse models of insulin-resistant conditions in a Peroxisome Proliferator-Activated Receptor-gamma Coactivator 1관 (PGC-1관)-dependent manner. Overexpression of SMEK promotes elevations in plasma glucose with increased hepatic gluconeogenic gene expression, whereas depletion of the SMEK proteins reduces hyperglycemia and enhances CRTC2 phosphorylation; the effect is blunted by S171A CRTC2, which is refractory to salt-inducible kinase (SIK)-dependent inhibition. Taken together, we would propose that mammalian SMEK/PP4C proteins are involved in the regulation of hepatic glucose metabolism through dephosphorylation of CRTC2.</P>
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