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Search Results: 1 - 10 of 139477 matches for " K. Lung "
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A Hidden Threat: Subungual Melanoma in Hand  [PDF]
Chris Y. K. Tang, Boris Kwok-Keung Fung, C. P. Lung
Surgical Science (SS) , 2012, DOI: 10.4236/ss.2012.32014
Abstract: Subungual melanoma, a relatively uncommon disease, has a worse prognosis than cutaneous melanoma in other sites. Both this life-threatening disease and its treatment cause cosmetic and functional impairment to the patient. The diagnosis is often delayed and resulting an advanced disease at presentation. The important clinical manifestation, diagnosis and latest treatments for subungual melanoma are reviewed. Electronic databases of Medline, PubMed, and the Cochrane library were searched with the key word “subungual melanoma”. A clinical scoring system is proposed by the authors to stratify patients to undergo biopsy, making earlier diagnosis of this disease possible. The latest trend of treatment involves wide local excision at a more distal level of the affected digit, in contrast to radical amputation of the digit in the past. Studies have shown that this does not decrease the survival nor increase local recurrence, but reduces the functional impairment for the patient. This review aims to summarise the approach to subungual melanoma for clinicians, so that they can recognise and diagnose this disease early and generate the best functional and cosmetic outcome for the patients.
Semiblind frequency-domain timing synchronization and channel estimation for OFDM systems
Te-Lung Kung and Keshab K Parhi
EURASIP Journal on Advances in Signal Processing , 2013, DOI: 10.1186/1687-6180-2013-1
Abstract: In this article, we propose unit vectors in the high dimensional Cartesian coordinate system as the preamble, and then propose a semiblind timing synchronization and channel estimation scheme for orthogonal frequency division multiplexing (OFDM) systems. Due to the lack of useful information in the time-domain, a frequency-domain timing synchronization algorithm is proposed. The proposed semiblind approach consists of three stages. In the first stage, a coarse timing offset related to the delayed timing of the path with the maximum gain in multipath fading channels is obtained. Then, a fine time adjustment algorithm is performed to find the actual delayed timing in channels. Finally, the channel response in the frequency-domain is obtained based on the final timing estimate. Although the required number of additions in the proposed algorithm is higher than those in conventional methods, the simulation results show that the proposed approach has excellent performance of timing synchronization in several channel models at signal-to-noise ratio (SNR) smaller than 6 dB. In addition, for a low-density parity-check coded single-input single-output OFDM system, our proposed approach has better bit-error-rate performance than conventional approaches for SNR varying from 3 to 8 dB.
Performance evaluation of variable transmission rate OFDM systems via network source coding
Te-Lung Kung and Keshab K Parhi
EURASIP Journal on Advances in Signal Processing , 2013, DOI: 10.1186/1687-6180-2013-12
Abstract: Studies related to the network source coding have addressed rate-distortion analysis in both noiseless and noisy channels. However, to the best of authors' knowledge, no prior work has studied network source coding in the context of orthogonal frequency division multiplexing (OFDM) systems. In addition, the system performance using network source coding schemes also remains unknown. In this article, we first propose two variable transmission rate (VTR) OFDM systems by utilizing network source coding schemes, and then evaluate the system performance of these two proposed VTR-OFDM systems. For the proposed VTR single-input single-output OFDM system, we employ the concept of a network with intermediate nodes to develop a 3-stage encoder/decoder, and the proposed encoder provides three different coding rates from 0.5 to 0.8. As for the proposed VTR multi-band OFDM system, two correlated sources are simultaneously transmitted using the multiterminal source coding schemes, and two sources are encoded by different coding rates from 0.25 to 0.5. Finally, compared with the traditional uncoded OFDM system, the proposed VTR-OFDM systems have at least 1 to 4 dB gain in signal-to-noise ratio to achieve the same symbol error rate in the additive white Gaussian noise channel.
Statistical method for the determination of equivalence of automated test procedures
K. Rick Lung,Mary A. Gorko,Jennifer Llewelyn,Norman Wiggins
Journal of Analytical Methods in Chemistry , 2003, DOI: 10.1155/s146392460300021x
Abstract: In the development of test methods for solid dosage forms, manual test procedures for assay and content uniformity often precede the development of automated test procedures. Since the mode of extraction for automated test methods is often slightly different from that of the manual test method, additional validation of an automated test method is usually required. In addition to compliance with validation guidelines, developers of automated test methods are often asked to demonstrate equivalence between the manual and automated test methods. There are problems associated with using the traditional zero-difference hypothesis tests (such as the Student's t-test) for demonstrating equivalence. The use of the Westlake Interval and Schuirmann's Two One-sided test as more rigorous methods of demonstrating equivalence is discussed.
Quench Dynamics in Bose condensates in the Presence of a Bath: Theory and Experiment
A. Rancon,Chen-Lung Hung,Cheng Chin,K. Levin
Physics , 2013, DOI: 10.1103/PhysRevA.88.031601
Abstract: In this paper we study the transient dynamics of a Bose superfluid subsequent to an interaction quench. Essential for equilibration is a source of dissipation which we include following the approach of Caldeira and Leggett. Here we solve the equations of motion exactly by integrating out an environmental bath. We thereby derive precisely the time dependent density correlation functions with the appropriate analytic and asymptotic properties. The resulting structure factor exhibits the expected damping and thereby differs from that of strict Bogoliubov theory. These damped sound modes, which reflect the physics beyond mean field approaches, are characterized and the structure factors are found to compare favorably with experiment.
ANT Analysis on the River Management of Urban Taiwan: A Case Study of Keelung River in Taipei Basin  [PDF]
Tsu-Lung Chou
Advances in Applied Sociology (AASoci) , 2012, DOI: 10.4236/aasoci.2012.23027
Abstract: This article provides a historical investigation on river management in urban Taiwan. It demonstrates the application of actor network theory (ANT) on the long-term development and evolution of river management network through a case study of the Keelung River in Taipei Basin. The study considers the formation of the actors’ world of the Keelung River and the way the actors have affected flood drainage and the supply of land in the region. River management and induced disasters in the Basin are explored. Strengths and weaknesses of the ANT are also discussed.
Case Study of Solar Power Producing Efficiency from a Photovoltaic System  [PDF]
Ching-Lung Lin
Open Journal of Energy Efficiency (OJEE) , 2015, DOI: 10.4236/ojee.2015.43005
Abstract: To study the efficiency increasing of electric energy generation in the Photovoltaic System is concentrated on this paper. There are four cases to improve the efficiency of power producing from the Photovoltaic System. This article not only describes the differences of facilities before and after the proposal, but also evaluates the electric energy generation efficiency and improved results for each proposal. Finally, the better efficiency of all improving ways is analyzed to get into conclusions in order to provide further improvement and reference for the industry in the future. Overall, these proposed methods can improve the efficiency of solar photovoltaic electric energy generation in about 30.18%.
A Lower Bound Study on Software Development Effort
Lung-Lung Liu
International Journal of Computer Science and Security , 2010,
Abstract: This paper depicts a study on the lower bound of software development effort. The work begins with the transformation model which is with the popular software development lifecycle. In general, properly handled transformations can ultimately produce the software, and the processes form the path of software development. Each transformation is associated with an effort, or the weight of an element in a path. There can be a number of these paths since many different methods and tools can be used or reused for a single transformation. Then, the Shortest Path algorithm is applied to find a shortest path which is with a minimal total effort among all the paths. However, from time to time, when advanced methods and tools are introduced, the new paths and efforts will change the previously identified shortest path. Hence, the continued work is to discuss the minimal total effort of a potential shortest path, although it may be currently unavailable. Convergence analysis is firstly provided for the discussion of whether this shortest path exists, and lower bound analysis is then provided for the discussion of the completeness and soundness. This lower bound study is significant, since an optimal software development effort is determinable.
Embedding Software Engineering Disciplines in Entry-Level Programming
Lung-Lung Liu
International Journal of Computer Science and Security , 2009,
Abstract: Software engineering disciplines can be embedded in entry-level programming assignments as a very basic requirement for teachers to the students in the classrooms and mentors to their apprentices in the offices. We are to use three examples to demonstrate how easily some of these software engineering disciplines can be embedded, and we will then prove that they are helpful for quality and productive software development from the point of being with “no source code modification” when some requirements are changed. In fact, convergence can be confirmed even there have been these changes. If the entry-level programming works are with software engineering disciplines, then the total software development effort should be decreased. With this concept in mind for project managers, actually, there are simple refactoring skills that can be further applied to those programs already coded.
A New Analysis Method for WIMP searches with Dual-Phase Liquid Xe TPCs
K. Arisaka,P. Beltrame,C. Ghag,K. Lung,P. R. Scovell
Physics , 2012, DOI: 10.1016/j.astropartphys.2012.07.003
Abstract: A new data analysis method based on physical observables for WIMP dark matter searches with noble liquid Xe dual-phase TPCs is presented. Traditionally, the nuclear recoil energy from a scatter in the liquid target has been estimated by means of the initial prompt scintillation light (S1) produced at the interaction vertex. The ionization charge (C2), or its secondary scintillation (S2), is combined with the primary scintillation in Log(S2/S1) vs. S1 only as a discrimination parameter against electron recoil background. Arguments in favor of C2 as the more reliable nuclear recoil energy estimator than S1 are presented. The new phase space of Log(S1/C2) vs. C2 is introduced as more efficient for nuclear recoil acceptance and exhibiting superior energy resolution. This is achieved without compromising the discrimination power of the LXe TPC, nor its 3D event reconstruction and fiducialization capability, as is the case for analyses that exploit only the ionization channel. Finally, the concept of two independent energy estimators for background rejection is presented: E2 as the primary (based on C2) and E1 as the secondary (based on S1). Log(E1/E2) vs. E2 is shown to be the most appropriate phase space in which to evaluate WIMP signal candidates.
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