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Search Results: 1 - 10 of 340158 matches for " C. H. Hung "
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Effective memory of the minority game
C. H. Hung,S. S. Liaw
Physics , 2006, DOI: 10.1016/j.physa.2007.02.048
Abstract: It is known that the memory is relevant in the symmetric phase of the minority game. In our previous work we have successfully explained the quasi-periodic behavior of the game in the symmetric phase with the help of the probability theory. Based on this explanation, we are able to determine how the memory affects the variance of the system in this paper. By using some particular types of fake history such as periodic type and random type, we determine how efficient the memory has been used in the standard game. Furthermore, the analysis on the effective memory strongly supports the result we proposed previously that there are three distinct phases in the minority game.
Atmospheric transport of persistent semi-volatile organic chemicals to the Arctic and cold condensation in the mid-troposphere – Part 2: 3-D modeling of episodic atmospheric transport
L. Zhang, J. Ma, C. Tian, Y. Li,H. Hung
Atmospheric Chemistry and Physics (ACP) & Discussions (ACPD) , 2010,
Abstract: Two 3-dimensional global atmospheric transport models for persistent organic pollutants (POPs) have been employed to investigate the association between the large-scale atmospheric motions and poleward transports of persistent semi-volatile organic chemicals (SVOCs). We examine the modeled daily air concentration of α- and γ-hexachlorocyclohexane (HCH) over a period from 1997 through 1999 during which a number of episodic atmospheric transport events were detected in this modeling study. These events provide modeling evidence for improving the interpretation on the cold condensation effect and poleward atmospheric transport of SVOCs in the mid-troposphere. Two episodic transport events of γ-HCH (lindane) to the high Arctic (80–90° N), one from Asian and another from Eurasian sources, are reported in this paper. Both events suggest that the episodic atmospheric transports occurring in the mid-troposphere (e.g. from 3000 m to 5500 m height) are driven by atmospheric horizontal and vertical motions. The association of the transport events with atmospheric circulation is briefly discussed. Strong southerly winds, forced by the evolution of two semi-permanent high pressure systems over mid-high latitudes in the Northern Hemisphere, play an important role in the long-range transport (LRT) of HCHs to the high latitudes from its sources. Being consistent with the cold condensation effect and poleward atmospheric transport in a mean meridional atmospheric circulation simulated by a 2-D atmospheric transport model, as reported by the first part of this study, this modeling study indicates that cold condensation is likely occurring more intensively in the mid-troposphere where rapid declining air temperature results in condensed phase of the chemical over and near its source regions and where stronger winds convey the chemical more rapidly to the polar region during the episodic poleward atmospheric transport events.
Mechanical properties and thermo gravimetric
G.M. Wu,C.H. Hung
Journal of Achievements in Materials and Manufacturing Engineering , 2006,
Abstract: Purpose: In the continued quest for high performance, high temperature, light weight materials, the research anddevelopment of poly(1,4-phenylene-cis-benzobisoxazole) or PBO polymer was a significant step. The thermalstability, stiffness, and tensile strength surpass those of many other engineering polymers. In this report, thesuperior mechanical properties of PBO thin film materials and the thermal characteristics of the isotropic thinfilms were investigated. Thermogravimetric analysis (TGA) and the Ozawa method were employed to analyzethe thermal degradation kinetic parameters.Design/methodology/approach: The quasi-isotropic thin films were processed from 14 wt-% PBO dope withthe molecular weight about 130,000. Mini-tensile bar specimens of dog-bone-shape were prepared for MTStesting machine. The ASTM D1708 microtensile testing was carried out at room temperature. The TGA spectrawere obtained by employing Thermal Analysis (TA) TA-2050 thermogravimetric analyzer under various heatingrates in nitrogen. The Ozawa method has been used for the kinetic data analysis.Findings: The results showed that PBO thin film exhibited outstanding specific tensile properties andthermal resistance. The onset of the decomposition temperature in nitrogen atmosphere was about 670 C. Thetemperature that corresponded to the maximum decomposition rate was around 750 C. The residual weight wasstill as high as 73% when heated up to 850 C. The reaction followed a first order mechanism. In addition, theactivation energy (Ea ) for PBO thin film material has been estimated to be 445 kJ/mol and the frequency factor(logA) to be 25.2 min-1.Practical implications: The better understanding in PBO thin film processing and characteristics could help toadvance the structure design and unique applications.Originality/value: The outstanding specific mechanical properties and excellent thermal resistance shouldprovide great potential applications for this new class of high performance rigid rod polymers.
Carbonate mineral saturation states in the East China Sea: present conditions and future scenario
W.-C. Chou,G.-C. Gong,C.-C. Hung,Y.-H. Wu
Biogeosciences Discussions , 2013, DOI: 10.5194/bgd-10-5555-2013
Abstract: To assess the impact of rising atmospheric CO2 and eutrophication on the carbonate chemistry of the East China Sea shelf waters, saturation states (Ω) for two important biologically-relevant carbonate minerals, calcite (Ωc) and aragonite (Ωa) were calculated throughout the water column from dissolved inorganic carbon (DIC) and total alkalinity (TA) data collected in spring and summer of 2009. Results show that the highest Ωc (~9.0) and Ωa (~ 5.8) values were found in surface water of the Changjiang plume area in summer, whereas the lowest values (Ωc=~2.7 and Ωa=~1.7) were concurrently observed in the bottom water of the same area. This divergent behavior of saturation states in surface and bottom waters was driven by intensive biological production and strong stratification of the water column. The high rate of phytoplankton production, stimulated by the enormous nutrient discharge from the Changjiang, acts to decrease the ratio of DIC to TA, and thereby increases Ω values. In contrast, remineralization of organic matter in the bottom water acts to increase the DIC to TA ratio, and thus decreases Ω values. The projected result shows that continued increases of atmospheric CO2 under the IS92a emission scenario will decrease Ω values by 40–50% by the end of this century, but both the surface and bottom waters will remain supersaturated with respect to calcite and aragonite. Nevertheless, superimposed on such Ω decrease is increasing eutrophication, which would mitigate or enhance the Ω decline caused by anthropogenic CO2 uptake in surface and bottom waters, respectively. Our simulation reveals that under the combined impact of eutrophication and augmentation of atmospheric CO2, the bottom water of the Changjiang plume area will become undersaturated with respect to aragonite (Ωa=~0.8) by the end of this century, which would threaten the health of the benthic ecosystem.
Semi-automatic Annotation System for OWL-based Semantic Search
C.-H. Liu,S.-C. Hung,J.-L. Jain,J.-Y. Chen
International Journal on Computer Science and Engineering , 2009,
Abstract: Current keyword search by Google, Yahoo, and so on gives enormous unsuitable results. A solution to this perhaps is to annotate semantics to textual web data to enable semantic search, rather than keyword search. However, pure manual annotation is very time-consuming. Further, searching high level concept such as metaphor cannot be done if the annotation is done at a low abstraction level. We, thus, present a semi-automatic annotation system, i.e. an automatic annotator and a manual annotator. Against the web ontology language (OWL) terms defined by Protégé, the former annotates the textual web data using the Knuth-Morris-Pratt (KMP) algorithm, while the latter allows a user to use the terms to annotate metaphors with high abstraction. The resulting semantically-enhanced textual web document can be semantically processed by other web services such as the information retrieval system and the recommendation system shown in our example.
Synthesis and Bactericidal Ability of TiO2 and Ag-TiO2 Prepared by Coprecipitation Method
Robert Liu,H. S. Wu,Ruth Yeh,C. Y. Lee,Yungtse Hung
International Journal of Photoenergy , 2012, DOI: 10.1155/2012/640487
Abstract: Preparation of photocatalysts of TiO2 and Ag-TiO2 was carried out by coprecipitation method. The prepared photocatalysts were characterized by X-ray diffraction (XRD), SEM, EDX, and XRF analysis. The disinfection of E. coli, a model indicator organism for the safe water supply, was investigated by using TiO2 and Ag-TiO2 under different light sources. The treatment efficacy for the inactivation of E. coli would be UV/Ag-TiO2; visible/Ag-TiO2; dark/Ag-TiO2; UV (all 100%) > UV/TiO2 (99%) > visible/TiO2 (96%) > dark/TiO2 (87%) > visible (23%) > dark (19%). The order of disinfection efficiency by their corresponding kinetic initial apparent rate constants, , (min?1) would be UV/Ag-TiO2; visible/Ag-TiO2 (both 6.67) > UV (6.6) > dark/Ag-TiO2 (6.56) > UV/TiO2 (1.62) > visible/TiO2 (1.08) > dark/TiO2 (0.7) > visible (0.28) > dark (0.03). The application of TiO2 doped with silver strongly improved the ability of disinfection treatment. The study of mineralization of E. coli by measurement of TOC (total organic carbon) removal percentage showed that the visible light may effectively be applied for the disinfection unit of water and wastewater treatment system by using photocatalysts of Ag-TiO2. 1. Introduction Increasing demand and shortage of satisfactory clean water supplies due to the rapid development of industrialization, population growth, and serious droughts have become a global issue [1–3]. It is estimated that around 1.2 billion people lack access to safe drinking water, 2.6 billion have little or no sanitation, and millions of people died of severe waterborne diseases annually [3, 4]. Therefore, the quality of drinking water is becoming more and more of a concern worldwide. For suppressing the worsening of clean water shortage, disinfection development of advanced water treatment technologies with low cost and high efficiency to treat wastewater is also desirable. Pathogens are disease-causing organisms that grow and multiply within the host and excreted in human feces. Pathogens associated with water include bacteria, viruses, protozoa, and helminthes [5]. The microbiological standards for water and wastewater treatment system in their final disinfection treatment unit use coliform bacteria (typically Escherichia coli or E. coli) as indicator organisms whose presence suggestes that water is fecal contaminated. The final disinfection step to kill any remaining pathogenic organisms for water and wastewater treatment system includes some commonly used technologies, such as chlorination, ozonation, and UV irradiation. Chlorination has been the most
Brassica genomics: a complement to, and early beneficiary of, the Arabidopsis sequence
Andrew H Paterson, Tien-hung Lan, Richard Amasino, Thomas C Osborn, Carlos Quiros
Genome Biology , 2001, DOI: 10.1186/gb-2001-2-3-reviews1011
Abstract: Less than 20 years after DNA-level studies [1] highlighted the small DNA content and simple organization of the genome of Arabidopsis thaliana - an ephemeral weed-like member of the Cruciferae family - an essentially complete sequence of its genome has been announced [2]. This, the first complete genome sequence for a flowering plant, provides the means to investigate in unprecedented detail the common features that plants share with one another and with other life forms, as well as the unique features that adapt particular taxa to diverse life histories (such as the largely sessile nature of plants). Many botanists are especially interested in studying how the interaction of natural and human selection has enabled a small subset of plants to be 'domesticated' to provide food, feed, and fiber. Such investigations should be greatly facilitated by the availability of plant genome sequences.Crops of the genus Brassica (tribe Brassiceae), which are in the same taxonomic family as Arabidopsis thaliana, are widely used in the cuisine of many cultures, due, in part, to the many choices of edible forms in the genus. Economically, Brassica is loosely categorized into oilseed, vegetable, and condiment crops. B. napus, B. rapa (formerly campestris), B. juncea, and B. carinata provide about 12% of the worldwide edible vegetable oil supplies [3]. B. oleracea and B. rapa, the so-called 'cole crops', comprise many of the vegetables in our daily diet. Several of these vegetables have extreme morphological characteristics. Examples of such morphologies include the enlarged inflorescence of cauliflower (B. oleracea subspecies botrytis) and broccoli (B. oleracea subspecies italica); the enlarged stem of kohlrabi (B. oleracea subsp. gongylodes) and marrowstem kale (B. oleracea subspecies medullosa); the enlarged root of turnip (B. rapa subspecies rapifera); the enlarged and twisted leaves of Pak-choi (B. rapa subspecies chinesis) and Chinese cabbage (B. rapa subspecies pekinesis); and
Estimating radiation effective doses from whole body computed tomography scans based on U.S. soldier patient height and weight
Robert D Prins, Raymond H Thornton, C Ross Schmidtlein, Brian Quinn, Hung Ching, Lawrence T Dauer
BMC Medical Imaging , 2011, DOI: 10.1186/1471-2342-11-20
Abstract: One hundred mathematical phantoms of varying heights and weights were defined within an x-ray Monte Carlo based software code in order to calculate organ absorbed doses and effective doses from a chest abdomen pelvis scan. Regression analysis was used to develop an effective dose predictive model. The regression model was experimentally verified using anthropomorphic phantoms and validated against a real patient population.Estimates of the effective doses as calculated by the predictive model were within 10% of the estimates of the effective doses using experimentally measured absorbed doses within the anthropomorphic phantoms. Comparisons of the patient population effective doses show that the predictive model is within 33% of current methods of estimating effective dose using machine-based parameters.A patient's height and weight can be used to estimate the effective dose from a chest abdomen pelvis computed tomography scan. The presented predictive model can be used interchangeably with current effective dose estimating techniques that rely on computed tomography machine-based techniques.This research was driven by the need to estimate the radiation dose from computed tomography scans given to soldiers and civilians injured in austere environments. Nearly 50% of all injuries to United States Army soldiers in Operation Iraqi Freedom and Operation Enduring Freedom occurred in the head/neck, abdomen, and thorax region of the body [1,2]. Injuries in these regions are most commonly assessed using diagnostic x-ray scanning modalities such as computed tomography (CT). Current CT machines are able to scan an entire body in as little as 30 seconds making them particularly advantageous for diagnosing the extent of injuries sustained in traumatic events [3]. As a result, CT scanning is an integral part of the medical treatment schema from patient initial diagnosis through rehabilitation. In fact, because of this, CT scanning usage has steadily increased since its inception
Trapped Atoms in One-Dimensional Photonic Crystals
C. -L. Hung,S. M. Meenehan,D. E. Chang,O. Painter,H. J. Kimble
Physics , 2013, DOI: 10.1088/1367-2630/15/8/083026
Abstract: We describe one-dimensional photonic crystals that support a guided mode suitable for atom trapping within a unit cell, as well as a second probe mode with strong atom-photon interactions. A new hybrid trap is analyzed that combines optical and Casimir-Polder forces to form stable traps for neutral atoms in dielectric nanostructures. By suitable design of the band structure, the atomic spontaneous emission rate into the probe mode can exceed the rate into all other modes by more than tenfold. The unprecedented single-atom reflectivity $r_0 \gtrsim 0.9$ for the guided probe field should enable diverse investigations of photon-mediated interactions for 1D atom chains and cavity QED.
Data Processing Approach for Localizing Bio-magnetic Sources in the Brain
Hung-I Pai,Chih-Yuan Tseng,H. C. Lee
Quantitative Biology , 2009,
Abstract: Magnetoencephalography (MEG) provides dynamic spatial-temporal insight of neural activities in the cortex. Because the number of possible sources is far greater than the number of MEG detectors, the proposition to localize sources directly from MEG data is notoriously ill-posed. Here we develop an approach based on data processing procedures including clustering, forward and backward filtering, and the method of maximum entropy. We show that taking as a starting point the assumption that the sources lie in the general area of the auditory cortex (an area of about 40 mm by 15 mm), our approach is capable of achieving reasonable success in pinpointing active sources concentrated in an area of a few mm's across, while limiting the spatial distribution and number of false positives.
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