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A procedural footprint enhancement of global topographic surface with multiple levels of detail

International Journal of Digital Earth 2020年第4期13卷 527-545页

作者： Lukáš Brůha Jan Kolář Faculty of Science Department of Applied Geoinformatics and CartographyCharles University in PraguePragueCzech Republic Grifinor Project CopenhagenDenmark

Virtual globes are technologies for visual navigation through a threedimensional,multi-resolution model of the entire *** representations used in virtual globes,however,lack geometric flexibility at high-resolution levels of the planet-wide terrain *** is a problem especially if boundaries between individual geospatial features and the terrain are important.A novel integration of individual polygonal boundaries with a specific multi-resolution representation of the planet-wide terrain is developed in this *** the preparation stage,the integration relies on an original simplification algorithm applied to the polygonal boundaries between geospatial features and the *** output is a multiple level-of-detail(LOD)geometry,which can be combined with a known multi-LOD representation of the terrain that uses run-time *** data representation is suitable for storage in existing database systems,avoids any data redundancy across LODs,and is even independent of the subdivision schema that partitions the planet’s surface for the sake of dealing with *** runtime,a novel reconstruction algorithm stitches geometric parts from different LODs together in a manner that augments the multi-LOD representation of the *** a certain proximity range from a given position,the method reconstructs a scene that preserves topological relations between the boundaries of geospatial features with the *** method also guarantees that certain nearest proximity to the given position consists of the best geometries that correspond to the original *** properties of the method close up the gap between a mere exploratory visualization of static,pre-generated models and the models supporting geospatial analysis,which is deemed crucial for applications in Geographic Information Systems,Building Information Modelling and other software industries.A prototype implementation and experiment results that prove this method are also prese

关键词： Feature-based topography multiple level-of-detail procedural modeling vector data organization geometry reconstruction

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Learning models for endoscopic ultrasonography in gastrointestinal endoscopy

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World Journal of Gastroenterology 2015年第17期21卷 5176-5182页

作者： Gwang ha Kim Sung Jo Bang Joo ha Hwang Department of Internal Medicine Pusan National University School of Medicine Biomedical Research Institute Pusan National University HospitalBusan 602-739South Korea Department of Internal Medicine Ulsan University Hospital University of Ulsan College of Medicine Ulsan 682-714South Korea Division of Gastroenterology Department of MedicineUniversity of WashingtonSeattleWA 98104United States

Endoscopic ultrasonography(EUS) has become a useful diagnostic and therapeutic modality in gastrointestinal ***,EUS requires additional training since it requires simultaneous endoscopic manipulation and ultrasonographic *** adequate EUS training can be challenging since EUS is highly operator-dependent and training on actual patients can be associated with an increased risk of complications including inaccurate ***,several models have been developed to help facilitate training of *** models currently available for EUS training include computer-based simulators,phantoms,ex vivo models,and live animal *** each model has its own merits and limitations,the value of these different models is rather complementary than ***,there is a lack of objective data regarding the efficacy of each model with recommendations on the use of various training models based on expert opinion ***,objective studies evaluating the efficacy of various EUS training models on technical and clinical outcomes are still needed.

关键词： Endoscopic ultrasonography Training Phantom Computer simulation Animal model

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Significance of age and comorbidity as prognostic indicators for patients with bladder cancer

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Asian Journal of Andrology 2010年第5期12卷 766-774页

作者： Moon Soo ha In Ho Chang Department of Urology College of Medicine Chung-Ang University Seou1140-75 7 Korea

The aim of this study was to determine the impact that age and comorbidity status have on both overall and bladder cancer-specific survival of bladder cancer patients. We obtained medical information pertaining to a population of 528 patients with newly diagnosed bladder cancer from Chung-Ang University Hospital cancer registry. The Adult Comorbidity Evaluation-27 （ACE-27） test, which has been previously validated in adult cancer patients, was used to assess comorbidity. We evaluated differences in the demographic and clinical characteristics of included patients, as well as differences in the treatments they received after categorizing them by age. The median age at the time of bladder cancer diagnosis of the entire cohort was 63 years, and the median follow-up time was 97 months. Of the 528 patients who were included in our study, 303 had at least one comorbid condition and 249 died during the follow-up period. When patients were stratified by age, we found that older patients had a higher proportion of severe comorbidities （P 〈 0.01） than younger patients, and that a lower proportion of them underwent radical cystec- tomy for invasive bladder cancer （IBC）（P 〈 0.01）. By multivariate analysis, we found that older age was predictive of lower overall survival （OS） and bladder cancer-specific survival （BCSS） rates among patients with superficial bladder cancer （SBC） and of lower OS rates among patients with IBC. We also found that moderate-severe comorbidity status and treatment through a bladder-conserving approach were predictive of lower OS and cancer-specific survival rates among patients with IBC. The disparity between overall deaths and bladder cancer deaths was shown in SBC and increased along with age and higher comorbidity. Age and comorbidity were found to be independent predictive factors of OS and BCSS among bladder cancer patients, and explained the disparity that we observed between overall bladder cancer-specific mortality rates.

关键词： age comorbidity neoplasm prognostic indicator urinary bladder

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Bifurcation Analysis of the Voltage Controlled Photosensitive Chaotic Oscillator

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Chinese Physics Letters 2013年第6期30卷 42-45页

作者： Van ha Nguyen han Jung Song Department of nano Systems Engineering Inje UniversityGimhae 621-749Korea Center for nano Manufacturing Inje UniversityGimhae 621-749Korea

A photosensitive chaotic oscillator which can be controlled with light illumination under various control voltage levels is *** oscillator consists of a photodiode for the light input,clock switches and capacitors for the sample and hold function,a nonlinear function that creates an adjustable chaos map,and a voltage shifter that adjusts the output voltage for *** optimizing the photodiode sub-circuit by using an available photodiode model in PC-based simulation program with integrated circuit emphasis to obtain a suitable output,the full chaotic circuit is verified with standard 0.6-μm complementary metal oxide semiconductor *** dynamics are analyzed as a function of the light intensity under different control voltage *** time series,frequency spectra,transitions in state spaces,bifurcation diagrams and the largest Lyapunov exponent are improved.

关键词： oscillator chaotic function

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Effect of Length Scale Tuning of Background Error in WRF-3DVAR System on Assimilation of High-Resolution Surface data for Heavy Rainfall Simulation

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Advances in Atmospheric Sciences 2012年第6期29卷 1142-1158页

作者： Ji-Hyun ha Dong-Kyou LEE Atmospheric Sciences Program School of Earth and Environmental SciencesSeoul National UniversitySeoul 151-747Korea

We investigated the impact of tuning the length scale of the background error covariance in the Weather Research and Forecasting （WRF） three-dimensional variational assimilation （3DVAR） system. In particular, we studied the effect of this parameter on the assimilation of high-resolution surface data for heavy rainfall forecasts associated with mesoscale convective systems over the Korean Peninsula. In the assimilation of high-resolution surface data, the national Meteorological Center method tended to exaggerate the length scale that determined the shape and extent to which observed information spreads out. In this study, we used the difference between observation and background data to tune the length scale in the assimilation of high-resolution surface data. The resulting assimilation clearly showed that the analysis with the tuned length scale was able to reproduce the small-scale features of the ideal field effectively. We also investigated the effect of a double-iteration method with two different length scales, representing large and small-length scales in the WRF-3DVAR. This method reflected the large and small-scale features of observed information in the model fields. The quantitative accuracy of the precipitation forecast using this double iteration with two different length scales for heavy rainfall was high; results were in good agreement with observations in terms of the maximum rainfall amount and equitable threat scores. The improved forecast in the experiment resulted from the development of well-identified mesoscale convective systems by intensified low-level winds and their consequent convergence near the rainfall area.

关键词： WRF 3DVAR tuning surface data heavy rainfall

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Endoscopic submucosal dissection for early gastric cancer:It is time to consider the quality of its outcomes

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World Journal of Gastroenterology 2023年第43期29卷 5800-5803页

作者： Gwang ha Kim Internal Medicine Pusan National University School of Medicine and Biomedical Research InstitutePusan National University HospitalBusan 47241South Korea

Endoscopic resection,particularly endoscopic submucosal dissection(ESD),is widely used as a standard treatment modality for early gastric cancer(EGC)when the risk of lymph node metastasis is *** with surgical gastrectomy,ESD is a minimally invasive procedure with additional advantages,such as preservation of the entire stomach and maintenance of the patient’s quality of ***,not all patients achieve curative resection after ESD of *** patients require surgical gastrectomy after ESD to achieve a curative *** surgery after ESD,owing to non-curative resection,places considerable emotional and financial burdens on ***,as the number of endoscopists performing ESD has increased,the rate of non-curative resection after ESD has increased *** order to decrease the non-curative resection rate,as well as determine the ideal rate of non-curative resection after ESD,it is time to consider quality indicators for the outcomes of ESD for EGC.

关键词： Early gastric cancer Endoscopic resection Quality indicator

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Tracking and Sensor Coverage of Spatio-temporal Quantities Using a Swarm of Artificial Foraging Agents

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Journal of Bionic Engineering 2016年第4期13卷 679-689页

作者： John Oluwagbemiga Oyekan Dongbing Gu Huosheng ha School of Aerospace Transport and Manufacturing Cranfield University College Road Cranfield MK43 OAL UK School of Computer Science and Electronic Engineering University of Essex Wivenhoe Park Colchester CO4 3SQ UK

Using a network of mobile sensors to track and map a dynamic spatio-temporal process in the environment is one of the current challenges in multi-agent systems. In this work, a distributed probabilistic multi-agent algorithm inspired by the bacte- rium foraging behavior is presented. The novelty of the algorithm lies in being capable of tracking and mapping a spa- tio-temporal quantity without the need of machine learning, estimation algorithms or future planning. This is unlike most current techniques that rely heavily on machine learning to estimate the distribution as well as the profile of spatio-temporal quantities. The experimental studies carried out in this work show that the algorithm works well by following the concentration gradient of a dynamic plume created under diffusive conditions. Furthermore, the algorithm is inherently capable of finding the source of a diffusive spatio-temporal quantity as well as performing environmental exploration. It is computationally tractable for simple agents, shown to adapt to its environment and can deal successfully with noise in sensor readings as well as in robot dynamics.

关键词： bioinspired algorithm artificial foraging swarm spatio-temporal mapping bacterium

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Performance of Forearm FMG for Estimating hand Gestures and Prosthetic hand Control

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Journal of Bionic Engineering 2019年第1期16卷 88-98页

作者： Nguon ha Gaminda Pankaja Withanachchi Yimesker Yihun Department of Mechanical Engineering Wichita State UniversityUSA Department of Electrical Engineering Wichita State UniversityUSA

This study is aimed at exploring the prediction of the various hand gestures based on Force Myography(FMG)signals generated through piezoelectric sensors banded around the *** the study,the muscles extension and contraction during specific movements were mapped,interpreted,and a control algorithm has been established to allow predefined grips and individual finger *** Tree Learning(DTL)and Support Vector Machine(SVM)have been used for classification and model *** of these estimated models generated an averaged accuracy of more than 80.0%,for predicting grasping,pinching,left flexion,and wrist *** the classification showed a distinct feature in the signal,a real-time control system based on the threshold value has been implemented in a prosthetic *** hand motion has also been recorded through Virtual Motion Glove(VMD)to establish dynamic relationship between the FMG data and the different hand *** classification of the hand gestures based on FMG signal will provide a useful foundation for future research in the interfacing and utilization of medical devices.

关键词： Force Myography(FMG) Surface Electromyography(sEMG) prosthetic hand gesture predictions and classifications bionic robot

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THE VALIDITY OF THE MODIFIED MORI-TAnaKA METHOD FOR COMPOSITES WITH SLIGHTLY WEAKENED INTERFACE

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Acta Mechanica Solida Sinica 1997年第2期10卷 108-117页

作者： Zhai, J Luo, ha ShaNGhaI JIAO TONG UNIV DEPT ENGN MECHSHANGHAI 200030PEOPLES R CHINA

This paper presents a direct Mori-Tanaka approach to calculate the effective moduli of particle-reinforced composites and fiber-reinforced composites with spring-like imperfect interfaces. By a comparison between these results and those obtained from the approximate Mori-Tanaka method developed by Qu for composites with slightly weakened interface, the validity of the Qu's method is revealed.

关键词： composite materials imperfect interface effective moduli Mori-Tanaka method

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Threat Model and Defense Scheme for Side-Channel Attacks in Client-Side Deduplication

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Tsinghua Science and Technology 2023年第1期28卷 1-12页

作者： Guanxiong ha hang Chen Chunfu Jia Mingyue Li College of Cyber Science Nankai UniversityTianjin 300350China Tianjin Key Laboratory of Network and data Security Technology Tianjin 300350China

In cloud storage,client-side deduplication is widely used to reduce storage and communication *** client-side deduplication,if the cloud server detects that the user’s outsourced data have been stored,then clients will not need to reupload the ***,the information on whether data need to be uploaded can be used as a side-channel,which can consequently be exploited by adversaries to compromise data *** this paper,we propose a new threat model against side-channel *** from existing schemes,the adversary could learn the approximate ratio of stored chunks to unstored chunks in outsourced files,and this ratio will affect the probability that the adversary compromises the data privacy through side-channel *** this threat model,we design two defense schemes to minimize privacy leakage,both of which design interaction protocols between clients and the server during deduplication checks to reduce the probability that the adversary compromises data *** analyze the security of our schemes,and evaluate their performances based on a real-world *** with existing schemes,our schemes can better mitigate data privacy leakage and have a slightly lower communication cost.

关键词： cloud storage deduplication side-channel privacy

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