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Pyeon, Jae-Ho,Park, Moonseo,Jung, Sangsun,Park, Taeho Land and Housing Institute 2020 LHI journal of land, housing, and urban affairs Vol.11 No.4
Incentive/Disincentive (I/D) contract is designed for minimizing any disruption of traffic flow in road construction projects. I/D contracting projects have been evaluated with regard to time and cost performance in various states, more than 35 states. However, construction project managers and planners have little understanding of the project factors that affect the project time and cost performance of highway construction projects using I/D regulations. Therefore, the purpose of this research is to find factors that affect I/D project success or failure to improve the decision-making process for the implementation of I/D projects. In order to achieve the objectives of this research, the researchers collected I/D road construction project data from FDOT and performed evaluation for each collected project. Then, project data analysis to identify key factors that affect I/D project performance was performed. In conclusion, five significant factors for project time performance and six significant factors for project cost perfornace were identified and summarized.
Low-temperature wafer-scale synthesis of two-dimensional SnS<sub>2</sub>
Pyeon, Jung Joon,Baek, In-Hwan,Lim, Weon Cheol,Chae, Keun Hwa,Han, Seong Ho,Lee, Ga Yeon,Baek, Seung-Hyub,Kim, Jin-Sang,Choi, Ji-Won,Chung, Taek-Mo,Han, Jeong Hwan,Kang, Chong-Yun,Kim, Seong Keun The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.37
<P>Research on two-dimensional (2D) metal dichalcogenides is rapidly expanding owing to their unique characteristics that do not exist in bulk materials. The industrially compatible development of these emerging materials is indispensable to facilitate the transition of 2D metal dichalcogenides from the research stage to the practical industrial application stage. However, an industrially relevant method, <I>i.e.</I>, the low-temperature synthesis of wafer-scale, continuous, and orientation-controlled 2D metal dichalcogenides, still remains a significant challenge. Here, we report the low-temperature (≤350 °C) synthesis of uniform and continuous n-type SnS2 thin films <I>via</I> the combination of atomic layer deposition (ALD) of tin oxides and subsequent sulfurization. Well-crystallized and aligned SnS2 layers parallel to the substrate are demonstrated through the phase engineering of the ALD-grown tin oxide and the substrate surface. The additional H2S plasma treatment at 300 °C leads to the formation of stoichiometric SnS2. The formation of conformal SnS2 layers over a three-dimensional undulating hole structure is confirmed, which reveals the potential for applications beyond the planar structured architecture. The present results could be a step toward the realization of 2D metal dichalcogenides in industry.</P>
A Bridge Monitoring System on Web-GIS Linking with UFID and BMS
Pyeon, Mu-Wook,Koo, Jee-Hee,Nam, Sang-Gwan,Park, Jae-Sun Korea Spatial Information Society 2006 한국공간정보학회지 Vol.14 No.4
시설물의 노후화에 따라 시설물의 안전한 사용을 위한 모니터링의 중요성이 증가하고 있다. 기존의 인력에 의한 수동 계측에 의존한 방법을 대체할 모니터링 방법으로 유비쿼터스 관련 기술의 도입이 요청되고 있다. 본 연구에서는 유비쿼터스 기술을 이용한 교량관리 시스템의 실용화를 위해 필요한 교량의 모니터링 정보를 실시간으로 제공하는 웹기반의 교량관리 GIS 시스템을 구성하였다. 특히, 교량 모니터링 정보와 교량관리 시스템과의 효율적인 연동을 위해 국가공간프레임인 UFID와 현재 건설교통부에서 운용예정인 GIS 기반 교량관리시스템(BMS)과의 연계방안을 연구하였다. 또한 GIS를 활용하여 교량관리를 수행함에 있어서 필수적인 구조물의 세부위치와 속성을 표현하는 데이터 표현 방식에 대하여 함께 제안하였다. Nowadays, the importance of safety monitoring for facilities is increasing. Therefore, the introduction of ubiquitous technology to replace the existing manually-operated methods is required. In this study, a web-based GIS system that provides monitoring information of bridges in real-time for the application of a bridge management system through the use of ubiquitous technology is constructed. Particular attention is given to the effective interconnection of bridge monitoring information and bridge management system and, through a ubiquitous environment, how to connect this with the UFID and the GIS-based bridge management system (BMS) operated by the Ministry of Construction and Transportation. In addition, data expression methods are also suggested that state the detailed locations and attributes of structures in bridge management by using GIS.
A Ru–Pt alloy electrode to suppress leakage currents of dynamic random-access memory capacitors
Pyeon, Jung Joon,Cho, Cheol Jin,Jeong, Doo Seok,Kim, Jin-Sang,Kang, Chong-Yun,Kim, Seong Keun IOP 2018 Nanotechnology Vol.29 No.45
<P>Rutile TiO<SUB>2</SUB>, a high temperature phase, has attracted interest as a capacitor dielectric in dynamic random-access memories (DRAMs). Despite its high dielectric constant of >80, large leakage currents caused by a low Schottky barrier height at the TiO<SUB>2</SUB>/electrode interface have hindered the use of rutile TiO<SUB>2</SUB> as a commercial DRAM capacitor. Here, we propose a new Ru–Pt alloy electrode to increase the height of the Schottky barrier. The Ru–Pt mixed layer was grown by atomic layer deposition. The atomic ratio of Ru/Pt varied in the entire range from 100 at.% Ru to 100 at.% Pt. Rutile TiO<SUB>2</SUB> films were inductively formed only on the Ru–Pt layer containing ≤43 at.% Pt, while anatase TiO<SUB>2</SUB> films with a relatively low dielectric constant (∼40) were formed at Pt compositions?>?63 at.%. The Ru–Pt (40–50 at.%) layer also attained an increase in work function of ∼0.3–0.4 eV, leading to an improvement in the leakage currents of the TiO<SUB>2</SUB>/Ru–Pt capacitor. These findings suggested that a Ru–Pt layer could serve as a promising electrode for next-generation DRAM capacitors.</P>
Pyeon, Cheol Ho,Azuma, Tetsushi,Takemoto, Yuki,Yagi, Takahiro,Misawa, Tsuyoshi Korean Nuclear Society 2013 Nuclear Engineering and Technology Vol.45 No.1
Neutron spectrum analyses of spallation neutrons are conducted in the accelerator-driven system (ADS) facility at the Kyoto University Critical Assembly (KUCA). High-energy protons (100 MeV) obtained from the fixed field alternating gradient accelerator are injected onto a tungsten target, whereby the spallation neutrons are generated. For neutronic characteristics of spallation neutrons, the reaction rates and the continuous energy distribution of spallation neutrons are measured by the foil activation method and by an organic liquid scintillator, respectively. Numerical calculations are executed by MCNPX with JENDL/HE-2007 and ENDF/B-VI libraries to evaluate the reaction rates of activation foils (bismuth and indium) set at the target and the continuous energy distribution of spallation neutrons set in front of the target. For the reaction rates by the foil activation method, the C/E values between the experiments and the calculations are found around a relative difference of 10%, except for some reactions. For continuous energy distribution by the organic liquid scintillator, the spallation neutrons are observed up to 45 MeV. From these results, the neutron spectrum information on the spallation neutrons generated at the target are attained successfully in injecting 100 MeV protons onto the tungsten target.