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Search Results: 1 - 10 of 245143 matches for " H. T. Kung "
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Stability of Classical Finite-Difference Time-Domain (FDTD) Formulation with Nonlinear Elements --- a New Perspective
F. Kung H. T. Chuah
PIER , 2003, DOI: 10.2528/PIER03010901
Abstract: In this paper new stability theorems for Yee's Finite- Difference Time-Domain (FDTD) formulation are derived based on the energy method. A numerical energy expression is proposed. This numerical energy is dependent on the FDTD model's and field components. It is shown that if the numerical energy is bounded, then all the field components will also be bounded as the simulation proceeds. The theorems in this paper are inspired by similar results in nonlinear dynamical system. The new theorems are used to prove the stability of a FDTD model containing non-homogeneous dielectrics, perfect electric conductor (PEC) boundary, nonlinear dielectric and also linear/nonlinear lumped elements. The theorems are intended to complement the well-known Courant-Friedrich-Lewy (CFL) Criterion. Finally it is shown how the theorems can be used as a test, to determine if the formulation of new lumped element in FDTD is proper or not. A proper formulation will preserve the dynamical stability of the FDTD model. The finding reported in this paper will have implications in the manner stability analysis of FDTD algorithm is carried out in the future.
A Hub Matrix Theory and Applications to Wireless Communications
H. T. Kung,B. W. Suter
EURASIP Journal on Advances in Signal Processing , 2007, DOI: 10.1155/2007/13659
Abstract: This paper considers communications and network systems whose properties are characterized by the gaps of the leading eigenvalues of AHA for a matrix A. It is shown that a sufficient and necessary condition for a large eigen-gap is that A is a “hub” matrix in the sense that it has dominant columns. Some applications of this hub theory in multiple-input and multiple-output (MIMO) wireless systems are presented.
TCP Trunking
H. T. Kung,S. Y. Wang
Computer Science , 1998,
Abstract: A TCP trunk is an IP tunnel under TCP control, capable of carrying packets from any number of user flows. By exploiting properties of TCP, a TCP trunk provides elastic and reliable transmission over a network, and automatically shares the network fairly with other competing trunks. Moreover, by aggregating user flows into a single trunk flow, TCP trunking can significantly reduce the number of flows that the network needs to manage, thereby allowing use of simplified management to achieve improved perfor mance. For example, when dealing with only a small number of TCP trunk flows, a router with a simple FIFO buffer can experience low packet loss rates. A TCP trunk is a "soft" circuit in the sense that it requires no flow states to be maintained inside the network. Setting up a TCP trunk involves only configuring the two end nodes. This is in contrast with traditional methods of configuring circuits via signaling of network nodes. A simple packet-dropping mechanism based on packet accounting at the transmitter of a TCP trunk assures that, when the trunk reduces its bandwidth in response to network congestion, user TCP flows carried by the trunk will reduce their bandwidths by the same proportion. Simu lation results have demonstrated that TCP trunks can provide improved network performance to users, while achieving high network utilization.
Reducing Reconciliation Communication Cost with Compressed Sensing
H. T. Kung,Chia-Mu Yu
Computer Science , 2012,
Abstract: We consider a reconciliation problem, where two hosts wish to synchronize their respective sets. Efficient solutions for minimizing the communication cost between the two hosts have been previously proposed in the literature. However, they rely on prior knowledge about the size of the set differences between the two sets to be reconciled. In this paper, we propose a method which can achieve comparable efficiency without assuming this prior knowledge. Our method uses compressive sensing techniques which can leverage the expected sparsity in set differences. We study the performance of the method via theoretical analysis and numerical simulations.
Multimodal sparse representation learning and applications
Miriam Cha,Youngjune Gwon,H. T. Kung
Computer Science , 2015,
Abstract: Unsupervised methods have proven effective for discriminative tasks in a single-modality scenario. In this paper, we present a multimodal framework for learning sparse representations that can capture semantic correlation between modalities. The framework can model relationships at a higher level by forcing the shared sparse representation. In particular, we propose the use of joint dictionary learning technique for sparse coding and formulate the joint representation for concision, cross-modal representations (in case of a missing modality), and union of the cross-modal representations. Given the accelerated growth of multimodal data posted on the Web such as YouTube, Wikipedia, and Twitter, learning good multimodal features is becoming increasingly important. We show that the shared representations enabled by our framework substantially improve the classification performance under both unimodal and multimodal settings. We further show how deep architectures built on the proposed framework are effective for the case of highly nonlinear correlations between modalities. The effectiveness of our approach is demonstrated experimentally in image denoising, multimedia event detection and retrieval on the TRECVID dataset (audio-video), category classification on the Wikipedia dataset (image-text), and sentiment classification on PhotoTweet (image-text).
Some linear-time algorithms for systolic arrays
Richard P. Brent,Franklin T. Luk,H. T. Kung
Mathematics , 2010,
Abstract: We survey some results on linear-time algorithms for systolic arrays. In particular, we show how the greatest common divisor (GCD) of two polynomials of degree n over a finite field can be computed in time O(n) on a linear systolic array of O(n) cells; similarly for the GCD of two n-bit binary numbers. We show how n * n Toeplitz systems of linear equations can be solved in time O(n) on a linear array of O(n) cells, each of which has constant memory size (independent of n). Finally, we outline how a two-dimensional square array of O(n)* O(n) cells can be used to solve (to working accuracy) the eigenvalue problem for a symmetric real n* n matrix in time O(nS(n)). Here S(n) is a slowly growing function of n; for practical purposes S(n) can be regarded as a constant. In addition to their theoretical interest, these results have potential applications in the areas of error-correcting codes, symbolic and algebraic computations, signal processing and image processing.
Relationship between the 1997/98 El Ni o and 1999/2001 La Ni a events and oil palm tree production in Tumaco, Southwestern Colombia
Y.-J. Wu, W. A. Gough, T. Jiang,H.-T. Kung
Advances in Geosciences (ADGEO) , 2006,
Abstract: Middle reaches of the Yangtze River are the worst flooded segments along the Yangtze River. It is important to understand and study the variations of frequency and magnitude of historical floods in this area and how were they related to or affected by EI Ni o in a long historical period. We applied the statistics and time series to study and analyze historical floods (1470-2000) and EI Ni o events (1525-1995). The results show that the more floods occurred in the latest 200 years. The power-spectral analysis suggests the main cycle of flood variation is longer than that of EI Ni o events. El Nino shows the fluctuations of about 2-year and 3~4 year period while the flood variation is not so significant but can also be identified in the period of 2, 8 and 40 years (it exceeds the level of confidence 0.03). Time series analyses of the fluctuation of flood and El Nino indicate that there is a significant correlation between the two at both high and moderate frequency sections. The result shows that the response of the floods along the middle reaches of the Yangtze River to the effects of El Nino events is not only delayed one or more than one year as suggested by many Chinese scientists, but it also can be somewhat longer delayed up to about 8 years. The result also indicates that the shorter the interval of EI Ni o events, the sooner the flood events follows. In other words, flood could be delayed with longer time if the interval time of EI Ni o events is longer.
Investigated the hospital utilization and medical resource usage of haemophilia A and B in Taiwan: 2001-2010  [PDF]
Yu H. Yan, Chih M. Kung
Health (Health) , 2013, DOI: 10.4236/health.2013.510A1001
Abstract:

Aim: The purpose of this study was to explore the impact of attributes of medical care organizations and patients on medical resource utilization by hemophilia (hemophilia A and hemophilia B; Hemophilia with musculoskeletal system and without). Methods: Hospitalization due to hemophilia (ICD9: 286.0 and 286.1) and hemophilia with musculoskeletal system (ICD9: 710.xx-739.xx) between 2001 and 2010 were identified from a national health insurance database. Calculated by patients and hospital characteristics, length of hospital stay, medical cost of hospitalization was analyzed. Results: Of the total of 2150 patients, a systemic analysis of the results showed a mean patient age of 30.2 and average medical costs per patient of NT $672,335 (US $21,010). We found the mean cost of cases being significantly higher during the hemophilia A that in the hemophilia B (NT $708,620 vs. NT $422,322, P < 0.001), and medical costs such as those for hemophilia with musculoskeletal system (NT $1,419,158) were significantly higher than comparison patients (NT $463,889) (P < 0.001). Conclusions: Taiwan operates a national insurance global budget payment system. Healthcare system budgetary pressures are exacerbated by increases in the costs of hemophilia treatment. Suggesting that Bureau of National Health Insurance (BNHI) should consider establishing official primary and secondary prophylaxis treatment and dose regimen (such as dose or tailored-dose) should consider establishing a more aggressive and comprehensive standard of care for hemophiliacs. It is believed that that will have a significant impact on future treatment for hemophiliacs in Taiwan.

The Impact of Hospital Accreditation System: Perspective of Organizational Learning  [PDF]
Yu H. Yan, Chih M. Kung
Health (Health) , 2015, DOI: 10.4236/health.2015.79123
Abstract: Objectives: Organizational learning is used to being a very important topic about hospital management and even is identified as the source of a hospital’s competitive strength. The study tries to explore the correlation between organizational learning and hospital accreditation awareness from the medical institution operation management’s point of view. Methods: We designed the questionnaire based on the cross-section survey, which included a total of 498 hospitals through-out Taiwan as the subjects (1922 copies of questionnaire were distributed, 4 copies per hospital). As a result, 306 returned the questionnaire (995 copies of valid questionnaire), a valid response rate was 49.94%. Then, we conducted the multiple regression analysis. Results: The factors critical to the operations management accreditation awareness include age, hospital ownership, hospital lever and team learning (p < 0.001). The factors critical to the medical care accreditation awareness include age, education level and team learning (p < 0.001). The team learning will produce positive effect to the hospital accreditation awareness. Conclusions: The organizational continuous learning may enhance the team learning through hospital accreditation operations to ensure that the medical treatment system may provide safe, valid and reliable healthcare and found the hospitals’ competitive strength.
硅基催化结构合成的策略
Harold H. KUNG,Mayfair C. KUNG
催化学报 , 2008,
Abstract: ?Twoapproachestosynthesizesilicon-basedcatalyticstructuresthataimatcapturingthepropertiesandfunctionalitiesofnaturalenzymesaredescribedinthisbriefreview:unit-by-unitsynthesisofmacromolecularunitsandtemplating/imprintingsynthesisofnanocages.Theunit-by-unitapproachmimicsthepeptidesynthesismethod,offersatomiccontrolofthestructure,butisinefficientinsynthesizinglargestructuressuchasnanocages.Thetemplating/imprintingmethodismoresuitablefornanocagesatthesacrificeofatomiccontrol,andthenanocagesobtainedareshowntopossesspropertiesexhibitedbyenzymecavities.
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