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Architecture for mobile group communication in campus environment

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Frontiers of Computer science 2013年第4期7卷 505-513页

作者： Yujin LIM sanghyun ahn Department of Information Media University of Suwon Hwaseong 445-743 Korea s.h.ol of Computer science University of Seoul Seoul 130-743 Korea

The demand for group communication using smart devices in campus environment is increasing rapidly. In this paper, we design an architecture for a mobile group communication system （MGCs） on campus by using Wi-Fi networks and smart devices. The architecture is composed of a web-based system and a smart device based mobile system. Through the systems, users on campus create community/mobile group, maintain dynamic group membership, and reliably deliver the message to other users. We use the common features of many smart devices to develop a prototype that works on off-the-shelf hardware. In the experimental section, we demonstrate our system using various real scenarios which can occur in university campuses.

关键词： smart campus smartphone location tracking,mobile community

Design and Analysis of Osmosis-based Artificial Muscle

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Journal of Bionic Engineering 2019年第1期16卷 56-65页

作者： Juhui Gim Changsun ahn s.h.ol of Mechanical Engineering Pusan National UniversityBusan 46241Korea

This paper presents the design and analysis of an osmosis-based artificial muscle inspired by the leaf movements of Mimosa ***'s leaves quickly contract using osmosis pressure in the pulvinus when they are *** analyzed and simulated an osmosis system to identify the factors for fast osmosis reactions and designed a prototype artificial muscle based on the *** osmosis phenomenon was mathematically modeled,analyzed,and verified through several *** analysis shows that fast osmosis responses require a large diffusion coefficient with a high-flux membrane or small ratio of the cross-sectional area to the volume of the osmosis *** designed a micro-scale system to achieve the required *** contraction and relaxation of the artificial muscle are realized by changes of the local concentration of potassium ions,which can be aggregated by a controllable electric *** a result,the artificial muscle shows controllable behavior with fast reactions.

关键词： Mimosa pudica osmosis artificial muscle cross-sectional area to volume ratio micro-scale

Editorial comment on:“systemic treatment of hepatocellular carcinoma:an EAsL position paper”

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hepatobiliary surgery and Nutrition 2022年第1期11卷 112-114页

作者： Daniel h.ahn Tanios Bekaii-saab Division of hematology/Medical Oncology Mayo Clinic ArizonaPhoenixAZUSA

hepatocellular carcinoma is the most common cancer of the liver and worldwide,the sixth most common cancer and the third most common cause of cancer related deaths(1).The management and treatment of this disease requires a multi-disciplinary approach,which is observed in the staging and *** 1999,the development of the Barcelona Clinic Liver Cancer(BCLC)classification system helped to guide the appropriate treatments based on *** patients with stage A disease would be candidates for locoregional treatment including surgical resection,liver transplantation or liver directed therapy,treatment in patients with intermediate(B)or advanced(C)stage disease would be palliative,where the recommendation would for systemic therapy.

关键词： classification. treatment cancer

Indoor INs/UWB-based human Localization With Missing Data Utilizing Predictive UFIR Filtering

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IEEE/CAA Journal of Automatica sinica 2019年第4期6卷 952-960页

作者： Yuan Xu Choon Ki ahn Yuriy s. shmaliy Xiyuan Chen Lili Bu IEEE the s.h.ol of Electrical Engineering University of JinanJinan 250022China the s.h.ol of Electrical Engineering Korea UniversitySeoul 08241Republic of Korea the Department of Electronics Engineering Universidad de GuanajuatoSalamanca 36885Mexico the s.h.ol of Instrument science and Engineering Southeast University

A combined algorithm for the loosely fused ultra wide band(UWB)and inertial navigation system(INs)-based measurements is designed under the indoor human navigation conditions with missing *** s.h.me proposed fuses the INs-and UWB-derived positions via a data fusion *** the UWB signal is prone to drift in indoor environments and its outage highly affects the integrated s.h.me reliability,we also consider the missing data problem in UWB *** overcome this problem,the loosely-coupled INs/UWB-integrated s.h.me is augmented with a prediction option based on the predictive unbiased finite impulse response(UFIR)fusion *** show experimentally that,the standard UFIR fusion filter has.h.gher robustness than the Kalman *** is also shown that the predictive UFIR fusion filter is able to produce an acceptable navigation accuracy under temporary missing UWB-data.

关键词： Indoor human navigation INs/UWB model prediction unbiased FIR filter

Regression tree ensemble learning-based prediction of the heating and cooling loads of residential buildings

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Building simulation 2022年第11期15卷 2003-2017页

作者： Nikhil Pachauri Chang Wook ahn Al Graduate s.h.ol Gwangju Institute of Science and Technology123 Cheomdangwagi-roBuk-guGwangju 61005R.O.Korea

Building energy consumption is.h.avily dependent on its.h.ating load(hL)and cooling load(CL).Therefore,an efficient building demand forecast is critical for ensuring energy savings and improving the operating efficacy of the heating,ventilation,and air conditioning(hVAC)*** and specialized energy-efficient building modeling technologies may offer a fair estimate of the influence of different construction ***,deploying these tools could be time-consuming and complex for the ***,in this article,an ensemble model based on decision trees and the least square-boosting(Ls-boosting)algorithm known as the regression tree ensemble(RTE)is proposed for the accurate prediction of hL and *** hyper parameters of the RTE are optimized by shuffled frog leaping optimization(sFLA),which leads to *** regression(sTR)and Gaussian process regression(GPR)based on different kernel functions are also designed for comparison *** demonstrate that the value of root mean squared error is reduced by 37%–68%and 30%–41%for hL and CL of residential buildings,respectively,by the proposed sRTE in comparison to other ***,the findings from the real dataset support the proposed model’s effectiveness in predicting hVAC energy *** can be concluded that the proposed sRTE is more effective and accurate than other methods for predicting the energy consumption of hVAC systems.

关键词： energy heating load cooling load decision tree Ls-boosting shuffled frog leaping optimization

An efficient Biginelli one-pot synthesis of new benzoxazole-substituted dihydropyrimidinones and thiones catalysed by trifluoro acetic acid under solvent-free conditions

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Chinese Chemical Letters 2009年第9期20卷 1059-1061页

作者： D.shobha M.Adharvana Chari K.h.ahn Department of Applied Chemistry Kyung Hee UniversitySuwonYongin-siSouth Korea

An efficient synthesis of benzoxazole-substituted 3,4-dihydropyrimidinones （DhPMs） using trifluoro acetic acid as the catalyst for the first time from an aldehyde, 13-keto ester and benzoxazole-substituted urea/thiourea under solvent-free conditions is described. Compared to the classical Biginelli reaction conditions, this new method consistently has the advantage of excellent yields （80-91%） and short reaction time （40-130 min） at reflux temperature. 2009 M. Adharvana Chad. Published by Elsevier B.V. on behalf of Chinese Chemical society. All rights reserved.

关键词： Dihydropyrimidinones Trifluoro acetic acid Benzoxazole-substituted urea and thiourea

后现代性、后结构主义与现代哲学的历史编纂学

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世界社会科学 1998年第6期 75-80页

作者：Ｓ．Ｈ．丹尼尔,郭大为

尽管在过去的２５年中，关于现代性和后现代性的研究急剧增加，但是，对于什么是现代性，后现代性是否只是启蒙运动所开启的自我批判的延伸，依然还存在着相当大的困惑。正如历史学家、文学理论家和哲学家所指明的那样，由于后现代性宣... 详细信息

尽管在过去的２５年中，关于现代性和后现代性的研究急剧增加，但是，对于什么是现代性，后现代性是否只是启蒙运动所开启的自我批判的延伸，依然还存在着相当大的困惑。正如历史学家、文学理论家和哲学家所指明的那样，由于后现代性宣布的不是历史和哲学的终结，因而大量...

关键词：后现代性哲学史文学理论家启蒙运动后结构主义历史编纂学

Dynamic Characteristics of the Crankshaft system with Coupling Effect

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Journal of Energy and Power Engineering 2010年第5期4卷 18-26页

作者： s.h. Zhang K. Jia s.h.ol of Mechanical and Automation Engineering Shanghai hTstitute of Technology Shanghai 200235 China

The nonlinear dynamic model of the marine diesel crankshaft system with a propeller and 6 cranks is established, in which the variable moment of inertia of the linkage and the piston, coupling effect between torsional and axial vibration, the actuating force applied on the piston, the actuating torque and force applied on the propeller is included. The governing equations of the model denote a strong nonlinear and non autonomous system. By numeric simulation, the dynamic response of the system to initial displacement and initial speed, variable moment of inertia, the pressure applied on the piston by combustion gas, the torque and the axial force applied on the propeller by fluid is researched respectively. According to the research results, the variable moment of inertia and coupling effect between torsional and axial vibration are the fundamental reason for nonlinear vibration. Different actuating factors can not only result in different frequency components of the response, but make the same frequency component have different vibration amplitude. The dynamic behavior of the system is not influenced obviously by the actuating torque and force applied on the propeller. There is obvious difference in sensitivity of the dynamic response in the different direction to the same actuating factor.

关键词： Coupling effect between torsional and axial vibration nonlinear dynamic model crankshaft system dynamic response.

Item Response Theory Based Ensemble in Machine Learning

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International Journal of Automation and computing 2020年第5期17卷 621-636页

作者： Ziheng Chen hongshik ahn Department of Applied Mathematics and statistics Stony Brook UniversityNew York 11794−3600USA

In this article,we propose a novel probabilistic framework to improve the accuracy of a weighted majority voting *** order to assign higher weights to the classifiers which can correctly classify hard-to-classify instances,we introduce the item response theory(IRT)framework to evaluate the samples′difficulty and classifiers′ability *** assigned the weights to classifiers based on their *** models are created with different assumptions suitable for different *** making an inference,we keep a balance between the accuracy and *** our experiment,all the base models are constructed by single trees via *** explain the models,we illustrate how the IRT ensemble model constructs the classifying *** also compare their performance with other widely used methods and show that our model performs well on 19 datasets.

关键词： Classification ensemble learning item response theory machine learning expectation maximization(EM)algorithm