10 research outputs found
The origin of Lingqi divination method and meanings of its symbols
No full text本文将灵棋占法当作“易占”的一个支派加以研究。作者以《道藏》本及《四库全书》本中的《灵棋经》为基本文献，考察“灵棋课法”的由来与归属。作者认为，从道书记载情形看，灵棋课法早先应该属于道教使用的一种卜筮技艺。在分析了灵棋课法与易学的关系之后，作者从神明崇拜的角度进一步考察灵棋课法的道教色彩，阐述了该法所蕴含的思想旨趣，发掘其象征底蕴。Lingqi divination method is considered as a branch of the divination methods of I Ching in the paper. Taking advantage of Ling Qi Jing in Dao Zang and Si Ku Quan Shu, the author studied the origin and its ideology. He holds that, according to the records in books of Daoism, Lingqi divination method at first was a divination trick in Daoism. Having analyzed the correlation between Lingqi divination method and I Ching Learning, the author further examined the method's color of Daoism from the angle of deity cult, expounded its ideological purport, and explored its symbolized implications
The analysis of reservoir operation rules in the southwestern United States using a hidden Markov-decision tree model
No full textRealistic reservoir operation is an important component in basin hydrological models. However, the operation rules can be complex under various situations and are not well understood yet. The objective of the study is to find out patterns of actual reservoir operation rules in a specific region under different conditions. The results are helpful to understand realistic reservoir operation behaviors. Moreover, the work will contribute to building a reservoir component for hydrological models and provide references for improving reservoir operation decisions in the future.
A hidden Markov-decision tree (HM-DT) model is applied in this study. Hidden Markov Model is used to describe the transition between operation states while each state corresponds to a decision tree model to determine daily reservoir releases. This study collected the historical records of 66 reservoirs in the southwestern United States and 8 reservoirs in the northern United States and identified their regional representative operation modules.
A comparison between the representative operation modules was conducted to show the spatial variability of reservoir operations. Further, by analyzing the historical operation patterns of several reservoirs, the transitions between operation rules in different time periods were explored, including periodicity and special responses to floods. The operation rules adopted by reservoirs with different operation functions are also analyzed and compared. A robustness analysis was performed to confirm the robustness of the HM-DT model outputs. Finally, several attempts have been made to link the HM-DT model with Soil and Water Assessment Tool (SWAT) and future work is proposed.Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2023-05-01The student, Lingqi Lyu, accepted the attached license on 2021-04-24 at 09:10.The student, Lingqi Lyu, submitted this Thesis for approval on 2021-04-24 at 09:21.This Thesis was approved for publication on 2021-04-27 at 16:26.DSpace SAF Submission Ingestion Package generated from Vireo submission #16543 on 2021-09-16 at 17:05:11Made available in DSpace on 2021-09-17T02:34:47Z (GMT). No. of bitstreams: 2
LYU-THESIS-2021.pdf: 5477236 bytes, checksum: 3d90a68921e47915f7998cc488648925 (MD5)
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Previous issue date: 2021-04-27Embargo set by: Seth Robbins for item 118583
Lift date: 2023-09-17T02:34:57Z
Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemAuthor requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemU of I Onl
Efficient and Expressive Microfacet Models
No full textTitle: Efficient and Expressive Microfacet Models Author: Asen Atanasov Department: Department of Software and Computer Science Education Supervisor: doc. Dr. Alexander Wilkie, Department of Software and Computer Science Education Abstract: In realistic appearance modeling, rough surfaces that have micro- scopic details are described using so-called microfacet models. These include analytical models that statistically define a physically-based microsurface. Such models are extensively used in practice because they are inexpensive to compute and offer considerable flexibility in terms of appearance control. Also, small but visible surface features can easily be added to them through the use of a normal map. However, there are still areas in which this general type of model can be improved: important features like anisotropy control sometimes lack analytic solutions, and the efficient rendering of normal maps requires accurate and general filtering algorithms. We advance the state of the art with regard to such models in these areas: we derive analytic anisotropic models, reformulate the filtering problem and propose an efficient filtering algorithm based on a novel filtering data structure. Specifically, we derive a general result in microfacet theory: given an arbitrary microsurface defined via standard..
Efektivní a expresivní mikrofasetové modely
No full textNázev: Efektivní a expresivní mikrofasetové modely Autor: Asen Atanasov Katedra: Katedra softwaru a výuky informatiky Vedoucí: doc. Dr. Alexander Wilkie, Katedra softwaru a výuky informatiky Abstrakt: V realistickém modelování vzhledu jsou drsné povrchy, které mají mikroskopické detaily, popsány pomocí tzv. mikrofazetových modelů. Mezi tyto modely patří analytické modely, které statisticky definují fyzikálně založený mikropovrch. Takové modely jsou široce používány v praxi, protože jsou nenáročné na výpočet a nabízejí značnou flexibilitu ve vzhledu, který s nimi lze docílit. Tyto modely mohou být rozšířené o viditelné povrchové prvky prostřednictvím normálové mapy. Stále však existují oblasti, ve kterých lze tento obecný typ modelu vylepšit: důležité funkce, jako je řízení anizotropie, někdy postrádají analytická řešení a účinné vykreslování normálových map vyžaduje přesné a obecné filtrovací algoritmy. Posunujeme předchozí práci v následujících oblastech: odvodíme analytické anizotropní modely, přeformulujeme problém filtrování a navrhneme efektivní filtrační algoritmus založený na nové datové struktuře filtračních dat. Konkrétně odvodíme obecný výsledek v mikrofazetové teorii: na základě libovolného mikropovrchu definovaného pomocí standardní mikrofazetové statistiky ukážeme, jak konstruovat statistiku...Title: Efficient and Expressive Microfacet Models Author: Asen Atanasov Department: Department of Software and Computer Science Education Supervisor: doc. Dr. Alexander Wilkie, Department of Software and Computer Science Education Abstract: In realistic appearance modeling, rough surfaces that have micro- scopic details are described using so-called microfacet models. These include analytical models that statistically define a physically-based microsurface. Such models are extensively used in practice because they are inexpensive to compute and offer considerable flexibility in terms of appearance control. Also, small but visible surface features can easily be added to them through the use of a normal map. However, there are still areas in which this general type of model can be improved: important features like anisotropy control sometimes lack analytic solutions, and the efficient rendering of normal maps requires accurate and general filtering algorithms. We advance the state of the art with regard to such models in these areas: we derive analytic anisotropic models, reformulate the filtering problem and propose an efficient filtering algorithm based on a novel filtering data structure. Specifically, we derive a general result in microfacet theory: given an arbitrary microsurface defined via standard...Katedra softwaru a výuky informatikyDepartment of Software and Computer Science EducationMatematicko-fyzikální fakultaFaculty of Mathematics and Physic
Mechanical and shape memory properties of NiTi triply periodic minimal surface structures fabricated by laser powder bed fusion
No full textPorous NiTi lattice structures are widely used in the manufacture of crucial components owing to their excellent shape memory effect, superelasticity, and high damping capacities. However, the specific strength and lightweight characteristics of porous NiTi lattice structures fabricated by conventional technologies are limited by unpredictability. In this work, three types of porous NiTi structures based on triply periodic minimal surface (TPMS) – Diamond, Gyroid, and Primitive – were designed and manufactured by the laser powder bed fusion (LPBF) additive manufacturing process. This work demonstrates LPBF is a feasible and efficient approach to fabricate highly accurate porous NiTi TPMS structures. Moreover, the influence of each of these structures on the mechanical and shape memory properties was investigated. Among the three structures, Gyroid had the smallest volume fraction deviation. Furthermore, the Diamond structure had the largest compressive modulus (782.82 MPa) and ultimate yield strength (163.14 MPa). The Gyroid and Primitive structures exhibit excellent elastic recovery deriving from high values of compressive modulus (662.44 MPa, and 703.29 MPa), and can maintain reliable structural robustness. The Primitive structure exhibited the lowest mechanical properties (37.80 MPa). During the cyclic compression test, Gyroid and Primitive show a smaller unrecovered strain than Diamond. Primitive shows the largest recovered strain during the heating process (6.98%). The higher mechanical flexibility of Primitive structure endows this structure with higher recovery ratio. During the direct compression test, the residual strain exhibits a positive correlation with the loading strain. All three structures exhibit good deformation recovery capability with a strain of 4%. At a strain of 12%, recovered strain during heating became the dominant factor in the recovery of the TPMS structure. Overall, porous NiTi TPMS structures are capable of reversible compressibility composed of rapid elastic recovery and controllable shape memory recovery. The unique performance of porous NiTi TPMS structure fabricated by LPBF renders it a highly efficiency energy-absorbing structure.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Biomechanical Engineerin
Theoretical analysis and performance evaluation of smart windows
No full textBuildings account for one-third of the global final energy consumption, and space heating and cooling are responsible for around 40% of the building total energy use. Meanwhile, designing buildings with large glazing area has become an architectural trend since decades. To achieve energy conservation in buildings with large glazing area, the application of novel technologies is of high importance. In this study, a novel triple glazed fluidic window is introduced. This fluidic window contains one or multiple micro-structured glass panes, which can be used for fluid circulation. With this concept, different application cases can be realized, such as heating/cooling panel for indoor air-conditioning, heat exchanger for heat pump or switchable solar shading. This work concentrates on the feasibility investigation and the energy efficiency of the application cases. For the theoretical analysis, several simplified modeling methods for the triple glazed fluidic window are presented and validated with coupled heat transfer and fluid flow numerical simulation. With the presented models, this work shows that using magnetic particle suspended fluid as the circulating fluid inside the triple glazed fluidic window reduces buildings solar heat gain and thus the cooling loads becomes lower. Furthermore, when two glass panes are replaced with the capillary glass panes, the triple glazed window becomes a decentral heat pump. Moreover, over-bridging the inner and the outer fluidic glass pane enables passive cooling. A simulation study shows that this device can reach a high energy efficiency. For the future work on this subject, the author suggests that the possibility of integrating an energy harvesting device into the fluidic window, or using the fluidic window directly as an energy harvesting device, should be further explored
Depression in patients with epilepsy during the COVID‐19 pandemic based on longitudinal self‐reporting
No full textInternal Activation of Peptidyl Prolyl Thioesters in Native Chemical Ligation
No full textProlyl thioesters have shown significantly
lower reactivities in
native chemical ligation (NCL) in comparison to that of the alanyl
thioester. This report describes a mild and efficient internal activation
protocol of peptidyl prolyl thioesters in NCL without using any thiol-based
additives, where the introduction of a 4-mercaptan substituent on
the C-terminal proline significantly improves the reactivity of prolyl
thioesters via the formation of a bicyclic thiolactone intermediate.
The kinetic data indicate that the reaction rate is comparable to
that of the reported data of alanyl thioesters, and the mechanistic
studies suggest that the ligation of two peptide segments proceeds
through an NCL-like pathway instead of a direct aminolysis, which
ensures the chemoselectivity and compatibility of various amino acid
side chains. This 4-mercaptoprolyl thioester-based protocol also allows
an efficient one-pot ligation–desulfurization procedure. The
utility of this method has been further demonstrated in the synthesis
of a proline-rich region of Wilms tumor protein 1
Design of LDPC Codes: A Survey and New Results
No full textThis survey paper provides fundamentals in the design of LDPC codes. To provide a target for the code designer, we first summarize the EXIT chart technique for determining (near-)optimal degree distributions for LDPC code ensembles. We also demonstrate the simplicity of representing codes by
protographs and how this naturally leads to quasi-cyclic LDPC codes. The EXIT chart technique is then extended to the special case of protograph-based LDPC codes. Next, we present several design approaches for LDPC codes which incorporate one or more accumulators, including quasi-cyclic accumulatorbased codes. The second half the paper then surveys several
algebraic LDPC code design techniques. First, codes based on finite geometries are discussed and then codes whose designs are based on Reed-Solomon codes are covered. The algebraic designs lead to cyclic, quasi-cyclic, and structured codes. The masking technique for converting regular quasi-cyclic LDPC codes to irregular codes is also presented. Some of these results and codes have not been presented elsewhere. The paper focuses
on the binary-input AWGN channel (BI-AWGNC). However, as discussed in the paper, good BI-AWGNC codes tend to be universally good across many channels. Alternatively, the reader may treat this paper as a starting point for extensions to more advanced channels. The paper concludes with a brief discussion of open problems
The developmental transcriptome for Lytechinus variegatus exhibits temporally punctuated gene expression changes
No full textEmbryonic development is arguably the most complex process an organism undergoes during its lifetime, and understanding this complexity is best approached with a systems-level perspective. The sea urchin has become a highly valuable model organism for understanding developmental specification, morphogenesis, and evolution. As a non-chordate deuterostome, the sea urchin occupies an important evolutionary niche between protostomes and vertebrates. Lytechinus variegatus (Lv) is an Atlantic species that has been well studied, and which has provided important insights into signal transduction, patterning, and morphogenetic changes during embryonic and larval development. The Pacific species, Strongylocentrotus purpuratus (Sp), is another well-studied sea urchin, particularly for gene regulatory networks (GRNs) and cis-regulatory analyses. A well-annotated genome and transcriptome for Sp are available, but similar resources have not been developed for Lv. Here, we provide an analysis of the Lv transcriptome at 11 timepoints during embryonic and larval development. Temporal analysis suggests that the gene regulatory networks that underlie specification are well-conserved among sea urchin species. We show that the major transitions in variation of embryonic transcription divide the developmental time series into four distinct, temporally sequential phases. Our work shows that sea urchin development occurs via sequential intervals of relatively stable gene expression states that are punctuated by abrupt transitions.National Science FoundationFirst author draf
