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🏛️國立陽明交通大學機構典藏

Subject: search.filters.subject.Localization

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Now showing 1 - 10 of 11
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    A Novel and Simple Algorithm Using Surface Electrocardiogram That Localizes Accessory Conduction Pathway in Wolff-Parkinson-White Syndrome in Pediatric Patients
    (2019-09-01)
    Li, Hsing-Yuan
    ;
    Chang, Shih-Lin
    ;
    Chuang, Chi-Hsi
    ;
    Lin, Ming-Chih
    ;
    Lin, Yenn-Jiang
    Background: The location of the accessory pathway (AP) can be precisely identified on surface electrocardiography (ECG) in adults with Wolff-Parkinson-White (WPW) syndrome. However, current algorithms to locate the AP in pediatric patients with WPW syndrome are limited. Objective: To propose an optimal algorithm that localizes the AP in pediatric patients with WPW syndrome. Methods: From 1992 to 2016, 180 consecutive patients aged below 18 years with symptomatic WPW syndrome were included. After the exclusion of patients with non-descriptive electrocardiography (ECG), multiple APs, congenital heart diseases, non-inducible tachycardia, and those who received a second ablation, 104 patients were analyzed retrospectively. Surface ECG was obtained before ablation and evaluated by using previously documented algorithms, from which a new pediatric algorithm was developed. Results: Previous algorithms were not highly accurate when used in pediatric patients with WPW syndrome. In the new algorithm, the R/S ratio of V1 and the polarity of the delta wave in lead I could distinguish right from the left side AP with 100% accuracy. The polarity of the delta wave of lead V1 could distinguish free wall AP from septal AP with an accuracy of 100% in left-side AP, compared to 88.6% in leads III and V1 for right-side AP. The overall accuracy was 92.3%. Conclusions: This simple, novel algorithm could differentiate left from right AP and septal from free wall AP in pediatric patients with WPW syndrome.
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    An Novel Landmark-based Localization Method in Mobile Platform using Magnetic Dipole
    (2016-01-01)
    Sun, Kuan-Chun
    ;
    Lo, Sheng-Wen
    ;
    電控工程研究所
    ;
    Institute of Electrical and Control Engineering
    This study aims to find a low-cost, robust, novel localization method related to a single magnetic landmark using 9D MARG sensors (Magnetic, Angular Rate, and Gravity). We derived an algorithm that can accumulated the space magnetic information during a time period to construct the flux distribution near the landmark. This helps to locate the coordinate of the moving object with respect to the landmark. The Extended Kalman is used for solving the problem and reducing the noise effect. The simulation analysis and experiment result show the effectiveness of the proposed algorithm in estimating the localization from the magnetic landmark.
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    Particle filter design for mobile robot localization based on received signal strength indicator
    (2016-11)
    Hsu, Cheng-Chung
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    Yeh, Syh-Shiuh
    ;
    Hsu, Pau-Lo
    ;
    電機工程學系
    ;
    Department of Electrical and Computer Engineering
    This paper presents a particle filter design to improve the accuracy of received signal strength indicator (RSSI)-based localization algorithms for localizing mobile robots that move in an environment with an 802.15.4 ZigBee wireless sensor network. In this study, the RSSI of transmission signals is adopted to estimate the location of a mobile robot by applying the trilateration algorithm. However, the interference and reflection effects of transmission signals and the orientation effects of the antenna can significantly affect the RSSI signals and result in serious localization errors. This study analyses the characteristics of RSSI signals and the orientation effects of the antenna and then develops a particle filter design with the fusion of the current states of the mobile robot to improve localization accuracy. A static localization experiment shows that the developed localization algorithm can significantly improve the localization accuracy, and a maximum rate of improvement of up to 85% is achieved in the test environment. A dynamic localization experiment demonstrates that the developed algorithm is suitable for localizing a mobile robot.
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    Photoluminescence of localized excitons in ZnCdO thin films grown by molecular beam epitaxy
    (2016-07)
    Wu, T. Y.
    ;
    Huang, Y. S.
    ;
    Hu, S. Y.
    ;
    Lee, Y. C.
    ;
    Tiong, K. K.
    We have investigated the luminescence characteristics of Zn1-xCdxO thin films with different Cd contents grown by molecular beam epitaxy system. The temperature-dependent photoluminescence (PL) and excitation power-dependent PL spectra were measured to clarify the luminescence mechanisms of the Zn1-xCdxO thin films. The peak energy of the Zn1-xCdxO thin films with increasing the Cd concentration is observed as redshift and can be fitted by the quadratic function of alloy content. The broadened full-width at half-maximum (FWHM) estimated from the 15 K PL spectra as a function of Cd content shows a larger deviation between the experimental values and theoretical curve, which indicates that experimental FWHM values are affected not only by alloy compositional disorder but also by localized excitons occupying states in the tail of the density of states. The Urbach energy determined from an analysis of the lineshape of the low-energy side of the PL spectrum and the degree of localization effect estimated from the temperature-induced S-shaped PL peak position described an increasing mean exciton-localization effects in ZnCdO films with increasing the Cd content. In addition, the PL intensity and peak position as a function of excitation power are carried out to clarify the types of radiative recombination and the effects of localized exciton in the ZnCdO films with different Cd contents. (C) 2016 Elsevier Ltd. All rights reserved.
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    Self-Contained Localization without Auxiliary Signals on Smart Devices
    (2014-01-01)
    Peng, Hsin-Hsien
    ;
    Lo, Chi-Chung
    ;
    Lin, Tsung-Ching
    ;
    Tseng, Yu-Chee
    ;
    資訊工程學系
    Wearable technologies have attracted considerable attention in mobile computing. This paper proposes a system for localization on wearable devices, such as the smart glasses. The existing approaches to localization, such as AoA, ToA, TDoA, GPS, and RF-based solutions, rely on auxiliary signals at set distances. This limitation constrains the availability of LBS when a mobile device is unable to receive the auxiliary signals. For example, GPS is not available in indoor environments. This paper proposes a system for "self-contained" localization, which refers to the capability of a device to determine its location without having to rely on auxiliary signals, and demonstrates the feasibility of using inertial measurement unit (IMU) and visual sensors in a smart phone to achieve this goal. Based on a concept called inertial sensor-assisted localization (ISAL), IMU sensors are triggered by user motions and visual cues are taken from existing objects. Using augmented reality (AR) techniques, objects captured by the smart phone camera are "tagged" manually or automatically by image processing tools. The angles of these objects relative to the user are then measured by IMU sensors. Based on these angles, we then develop an angulation algorithm to determine the location of the user.
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    音響定位之研究
    (2009)
    謝世福
    ;
    HSIEH SHIH-FU
    ;
    國立交通大學電信工程學系(所)
    一個定位系統是由多個固定端對於待測物的時間差與距離量距，來估測它的位置。主要應用包括機器人與UWB(Ultra-Wideband)無線感測網路。 [針對室內定位，我們希望利用聲音當作傳輸的信號。因為音響相對於射頻訊號，具有繞射，較低聲速與低硬體成本的優勢。 定位之前的距離估測主要的困難包括。電腦的隨機延遲所造成的同步問題，因環境而異的聲速，因阻礙物造成的估計誤差，以及如何有效追蹤運動中的機器人等議題。 首先我們提出了用參考麥克風來解決同步及聲速校準的問題，不同於傳統射頻信號同步(收發機成本高)，及飛行時間差(時間估測可靠度低) 的方法，本方法具有高準確及節省成本的好處，且由自製機器人實驗中，得到初步不錯的定位效果。其他議題包含喇叭與麥克風的替換，以及利用泰勒展開的最小方差法完成的多聲道定位。接著專注降低非直視線的誤差以及利用訊號能量來提升測距準確度的研究。最後作動態定位研究，利用過去估測的軌跡及速度，來修正時間記憶參數與泰勒展開參考值，以提升即時定位的準確度。
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    以安全、節能及遊憩為目的之車載網路系統---子計畫三：車載網路之位置感知服務---設計一個結合汽車及自行車行動導覽遊憩之系統(I)
    (2009)
    曾煜棋
    ;
    TSENG YU-CHEE
    ;
    國立交通大學資訊工程學系(所)
    本子計畫希望透過車載網路系統、並結合汽車與自行車導覽遊憩，以提供使用者位置感知服務。為了配合總計畫「以安全、節能及遊憩為目的之車載網路系統」以及應用其他子計畫所開發的技術，本子計畫將預期設計一套結合汽車與自行車行動之導覽遊憩系統；本子計畫有兩大研究方向：第一個研究方向是開發針對車載網路系統上之位置感知服務，目標是希望於車載裝置上，除了提供準確定位的服務外，甚而可獲得其他位置相關資訊；我們初期以建立樣本比對之定位系統作為無線通訊網路定位的基礎，之後將結合該樣本比對技術與現有成熟的全球定位系統(GPS)，以開發一套「混合型的全球定位系統」，該系統能夠隨時提供行動使用者正確且穩定的位置資訊，由於定位技術需要樣本位置訊號的訓練，如何有效結合車載網路、並利用汽車提供此訓練將是一大挑戰；之後，我們將基於Web 2.0的精神開發一套地理指紋社群系統，這是一套倚賴分享精神所建構的軟體定位平台，基於這個平台，我們預期將開發多個位置感知服務，例如：Geo-Ads(即時商家廣告)、Geo-Parking(附近停車資訊)、Geo-Search(搜查商家)等生活應用；最後，我們將透過車載網路系統存取這些應用，並結合到汽車與自行車導覽遊憩中。第二個研究方向是針對汽車與自行車導覽遊憩相關之案例研究，目標希望能實現以遊憩、甚而是節能的汽車及自行車的導覽遊憩系統，首先為了配合推廣自行車旅遊，我們會先針對營運面還有交通面進行調查，進而開發一套完善的自行車租借營運系統，再來是結合車載網路之位置感知服務於自行車觀光導覽上，以其使自然生態得到保護、遊憩需求得到滿足。 在為期三年的計畫期間中，我們將針對上述兩大研究方向開發相關的核心技術與實作系統；在第一年度中，我們將研發重要的定位核心技術，包括以車載網路系統為基礎的樣本比對技術、混合型的全球定位系統、以及在車載系統上提供定位與慣性導航，此外，我們將深入研究並分析目前國內外對於自行車遊憩與租借系統之案例分析，包括需求/交通/通訊面的調查，以及改變模式應用的研究。有了第一年度的定位核心技術與自行車遊憩與租借系統成功案例之分析，在第二年度中，我們將開發一系列的位置感知服務以及開發自有的自行車遊憩與租借系統，在位置感知服務方面，我們將設計地理指紋社群系統平台、並於其上開發多個生活應用，最後即可透過車載網路系統存取該平台，以便讓使用者順利取得想要的位置感知服務；在開發自有的自行車遊憩與租借系統的方面，我們將結合CHC開發的技術，研發一套低成本、人性化、高營運性的自行車遊憩與租借系統，而其中CHC的技術包含了智慧型雙辨識系統技術、防竊裝置機電控制系統技術、以及參數式安全監控管理系統技術。最後，在第三年度當中，我們將與新竹縣綠世界生態農場合作，把車載位置感知服務以及所開發的自行車遊憩與租借系統應用在汽車、自行車、與步行之導覽遊憩，這年度的工作目標除了基本的網路與相關設備之佈建與園區的導覽內容之建置外，我們預期提供汽車、自行車、與行人之位置感知與導覽遊憩之服務，並提供使用者於車載定位平台上選取綠世界園區的個人化之數位旅遊日誌服務。
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    在4G寬頻行動系統環境下，以智慧型裝置為平台之行動擴增實境技術和應用之探討-子計畫二：於4G BMS環境下，在智慧型裝置平台上利用環場視覺系統作擴增實境式室內外環境導覽
    (2012)
    蔡文祥
    ;
    TSAI WEN-HSIANG
    ;
    國立交通大學資訊工程學系（所）
    隨著智慧型手持式裝置與行動網路頻寬之進步，智慧型手持式裝置之應用也日新月異，尤其在行 動擴增實境的技術上，值得持續研究。本計畫「於4G BMS 環境下，在智慧型裝置平台上利用環場視 覺系統作擴增實境式室內外環境導覽」擬利用兩年時間，利用各種新型環場視覺感測設備及系統組 態，研發行動擴增實境的各種室內外導覽系統與應用。本計畫擬以兩年時間進行下列研究主題及項目。 (I) 第一年研究主題 應用擴增實境技術作室內空間導覽 (1) 研究項目一：利用下視環場攝影機建立室內空間導覽地圖 系統環境建置與主從式系統架構 環場攝影機之校正與真實世界座標轉換 多環場攝影機之校正及環境地圖之建立 攝影機接手與多人環境追蹤 (2) 研究項目二：整合下視環場攝影機與擴增實境技術應用於室內空間導覽 使用者位置定位及手持裝置之高精準定位與定向 導引路線規劃及整合擴增實境之導覽系統 利用擴增實境技術提供商品及地點資訊展示 結合第四代行動通訊系統LTE-A 及中央伺服器架構 (II) 第二年研究主題 應用擴增實境技術作室外園區導覽 (1) 研究項目一：利用車上同軸雙環場攝影機建立室外園區模型 室外導航系統架構之建立 雙環場攝影機之立體資料擷取 建立區域模型以及偵測特徵點 偵測地標特徵點 (2) 研究項目二：整合擴增實境與車上同軸雙環場攝影機作室外園區導覽 環場影像與車前玻璃的影像校正 建立環場透視影像以及利用PTZ 攝影機聚焦目標 擴增實境的路線指引與自動導航 結合第四代行動通訊系統LTE-A
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    SIMMOD機場模擬模式之功能探討與應用分析
    (1999)
    韓復華
    ;
    HAN ANTHONY FU-WHA
    ;
    交通大學運輸工程與管理系
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    Adaptive radio maps for pattern-matching localization via inter-beacon co-calibration
    (2012-04-01)
    Lo, Chi-Chung
    ;
    Hsu, Lan-Yin
    ;
    Tseng, Yu-Chee
    ;
    資訊工程學系
    ;
    Department of Computer Science
    A growing number of location-based applications are based on indoor positioning, and much of the research effort in this field has focused on the pattern-matching approach. This approach relies on comparing a pre-trained database (or radio map) with the received signal strength (RSS) of a mobile device. However, such methods are highly sensitive to environmental dynamics. A number of solutions based on added anchor points have been proposed to overcome this problem. This paper proposes an approach using existing beacons to measure the RSS from other beacons as a reference, which we call inter-beacon measurement, for the calibration of radio maps on the fly. This approach is feasible because most current beacons (such as Wi-Fi and ZigBee stations) have both transmitting and receiving capabilities. This approach would relieve the need for additional anchor points that deal with environmental dynamics. Simulation and experimental results are presented to verify our claims. (C) 2012 Elsevier B.V. All rights reserved.