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CLAPP-PUPPE TYPE LUSTERNIK-SCHNIRELMANN (CO)CATEGORY IN A MODEL CATEGORY
Yau, Donald Korean Mathematical Society 2002 대한수학회지 Vol.39 No.2
We introduce Clapp-Puppe type generalized Lusternik-Schnirelmann (co)category in a Quillen model category. We establish some of their basic properties and give various characterizations of them. As the first application of these characterizations, we show that our generalized (co)category is invariant under Quillen modelization equivalences. In particular, generalized (co)category is invariant under Quillen modelization equivalences. In particular, generalized (co)category of spaces and simplicial sets coincide. Another application of these characterizations is to define and study rational cocategory. Various other applications are also given.
In Situ Scanning Tunneling Microscope of Cyanide and Thiocyanate Adsorption on Pt(111)
Yau, Shueh-Lin,Kim, Youn-Geun,Itaya, Kingo 한국분석과학회 1995 분석과학 Vol.8 No.4
Cyclic voltammetry and in situ STM were employed to examine the interfacial structures of a Pt(111) electrode in 0.1 mM KCN (pH9.5) and 0.1 mM KSCN (pH7) solutions. In situ STM atomic resolution revealed well ordered (2${\surd}$3${\times}$2${\surd}$3)$R30^{\circ}$-6CN and ($2{\times}2$)-2SCN structures within the double layer charging region. Six CN adsorbates formed a hollow hexagon, which embraced a coadsorbed $K^+$ cation. In contrast, the coadsorbed $K^+$ cations on the SCN covered Pt(111) were poorly ordered, despite adsorbed SCN formed a long range ordered ($2{\times}2$)-2SCN adlattice. In situ STM revealed the pronounced influence of potential in controlling the structures of compact layers at the proximity of a Pt electrode. Cathodic polarization facilitated the replacement of the coadsorbed cations by protons.
Yau, S.Y.,Kim, T.H.,Yoo, S.S.,Kim, D.E. Elsevier Sequoia [etc.] 2016 Wear: An international journal on the science and Vol.348 No.-
<P>Micro-scale wear characteristics of ultra-fine gold wires with a diameter of 28 pm was investigated under a low contact force over a long sliding distance up to 200 km. The tip of the wire was slid against a silicon wafer under a low normal force of 5 mu N. Wear of the gold wire was quantified from the images of the tip obtained by a 3D laser microscope and a scanning electron microscope before and after the wear test. The dimensionless Archard relationship wear coefficient was in the order of 10(-7) which was extremely low considering that sliding was carried out in dry condition. Such a low wear characteristics was attributed to low contact pressure that could be achieved by formation of a conformal contact due to flattening of the wire tip as sliding wear progressed. Wear behavior of the gold wire could be characterized by formation of thin flakes of wear debris that were generated as a result of adhesive shear stress imparted at the sliding interface. As an effort to reduce the wear coefficient even further, octadecyltrichlorosilane self-assembled monolayer was deposited on the silicon to serve as a nano-lubricant. It was effective in improving the wear resistance by about two-fold. (C) 2015 Elsevier B.V. All rights reserved.</P>
Interaction Effect of Working Memory Capacity and Load in an Error Detection Task
( Yau Sze Yuen ),( Simon Y. W. Li ) 한국감성과학회 2014 춘계학술대회 Vol.2014 No.-
A controlled experiment was carried out to examine the effects of working memory (WM) capacity and load on error detection performance. Twelve participants took part in a simple paper-based error checking task and their WM capacity was assessed. WM load was manipulated to yield three conditions: no-load, mid-load and high-load. A reliable interaction effect between WM capacity and load is found in terms of error detection performance: low-capacity and high-capacity participants perform equally well in no-load condition, however, low-capacity participants perform significantly worse in mid- and high-load conditions. High-capacity participants`performance is unaffected by higher WM loads. The significant interaction effect is consistent with the initial prediction. The results are explained in terms of Salvucci and Taatgen`s (2008) threaded cognition.
Interaction effect of working memory capacity and load in an error detection task
Yau Sze Yuen,Simon Y. W. Li 대한인간공학회 2014 대한인간공학회 학술대회논문집 Vol.2014 No.5
A controlled experiment was carried out to examine the effects of working memory (WM) capacity and load on error detection performance. Twelve participants took part in a simple paper-based error checking task and their WM capacity was assessed. WM load was manipulated to yield three conditions: no-load, mid-load and high-load. A reliable interaction effect between WM capacity and load is found in terms of error detection performance: lowcapacity and high-capacity participants perform equally well in no-load condition, however, low-capacity participants perform significantly worse in mid- and high-load conditions. High-capacity participants’ performance is unaffected by higher WM loads. The significant interaction effect is consistent with the initial prediction. The results are explained in terms of Salvucci and Taatgen’s (2008) threaded cognition.
Lateral vibration control of a low-speed maglev vehicle in cross winds
Yau, J.D. Techno-Press 2012 Wind and Structures, An International Journal (WAS Vol.15 No.3
This paper presents a framework of nonlinear dynamic analysis of a low-speed moving maglev (magnetically levitated) vehicle subjected to cross winds and controlled using a clipped-LQR actuator with time delay compensation. A four degrees-of-freedom (4-DOFs) maglev-vehicle equipped with an onboard PID (Proportional-Integral-Derivative) controller traveling over guideway girders was developed to regulate the electric current and control voltage. With this maglev-vehicle/guideway model, dynamic interaction analysis of a low-speed maglev vehicle with guideway girders was conducted using an iterative approach. Considering the time-delay issue of unsynchronized tuning forces in control process, a clipped-LQR actuator with time-delay compensation is developed to improve control effectiveness of lateral vibration of the running maglev vehicle in cross winds. Numerical simulations demonstrate that although the lateral response of the maglev vehicle moving in cross winds would be amplified significantly, the present clipped-LQR controller exhibits its control performance in suppressing the lateral vibration of the vehicle.