Line of sight

here are various positioning algorithms proposed for Visible Light Communication (VLC) which require at least three “alive” transmitters to locate the object’s position. In terms of indoor scenarios, the shadowing of Line-of-sight (LOS) signal leads to insufficient information for positioning in a VLC system.

4p vigojek 02-02-2024 1 0   Download

Atomic layer deposition (ALD) has been widely used in the field of gas sensors thanks to the advantages of a non-line-of-sight technique that allows for conformal and uniform coating on virtually any type of substrates, and the capability of depositing various materials in a highly controlled manner.

14p vigojek 02-02-2024 5 2   Download

Part 1 of ebook "The end of accounting and the path forward for investors and managers" provides readers with contents including: corporate reporting then and now - a century of “progress”; and you thought earnings are the bottom line; matter of fact; the widening chasm between financial information and stock prices; worse than at first sight; investors’ fault or accounting’s; why is the relevance lost; the rise of intangibles and fall of accounting;...

141p tuongnhuoclan 27-11-2023 7 4   Download

Bài viết "Đánh giá hiệu năng hệ thống UAV hỗ trợ tán xạ ngược gói tin ngắn" đưa ra biểu thức thông lượng và tỉ lệ lỗi gói tin trung bình (BLER: block error rate) của thiết bị bay không người lái (UAV) hỗ trợ tán xạ ngược gói dữ liệu có kích thước hữu hạn. Giải bài toán tối ưu thông lượng trong điều kiện số bít truyền thay đổi và cố định số lần sử dụng kênh. Đánh giá phẩm chất hệ thống theo kênh truyền Nakagami-m, có ảnh hưởng của tia truyền thẳng (LoS: Line-of-Sight) và không có LoS (NLoS).

5p lieuyeuyeu18 23-12-2022 20 5   Download

In this paper, an efficient direct position determination approach, which is based on the combination model using the Kalman filter, has been proposed. The proposed approach enables accurately estimating the emitter position in various scenarios.

9p vispyker 14-11-2022 8 4   Download

This paper investigates the spatial cross-correlation properties of 5G channel modeling in non-line of sight (NLOS) of Urban Micro Cell (UMi), Rural Macro Cell (RMa) and Indoor Cell (InH) at 6 GHz frequency band as Third Generation Partnership Project (3GPP) specification.

8p vimelindagates 18-07-2022 12 5   Download

VieScope is a new type of laryngoscope, with a straight, transparent and illuminated blade, allowing for a direct line of sight towards the larynx. In addition, VieScope is disposed of after single patient use, which can avoid cross-contaminations of contagious material.

7p vidietmarhopp 28-12-2021 10 0   Download

Nội dung của bài viết này trình bày giải pháp hiệu quả cải thiện độ chính xác của định vị trong nhà, dựa trên góc tới AOA( Angle Of Arrival) kết hợp với bộ lọc Kalman đã được đề xuất. Giải pháp này có thể cải thiện độ chính xác cho bài toán định vị nguồn phát trong môi trường trong nhà so với phương pháp AOA truyền thống. Hai kịch bản được tạo ra để kiểm tra hiệu suất của giải pháp đề xuất. Kịch bản thứ nhất môi trường truyền dẫn tồn tại đường LOS ( Line Of Sight) và NLOS, kịch bản thứ hai môi trường truyền dẫn chỉ tồn tại các đường NLOS(Non - Line Of Sight) do các đường LOS bị suy giảm.

6p gaocaolon10 03-03-2021 37 2   Download

A manipulation system for unmanned surface vessels (USVs) as well as other unmanned vehicles and autonomous vehicles are commonly built up by three vital components which are guidance system, navigation system and control system, regardless of the mechanical aspects. In which, the navigation system will first use sensors to measure and estimate parameters, then feedback to the guidance system and the control system as input data. Based on those data and assignments from user, the guidance system calculates and outputs reference data for the control system.

11p trinhthamhodang9 04-12-2020 16 2   Download

This paper focuses on the various applications of RFID technology and the impact it creates on the organization’s improved information sharing in manufacturing organizations.

7p orianahuynh 08-06-2020 9 2   Download

We study the morpho-kinematics in the nascent wind of AGB star R Doradus in the light of high Doppler velocity wings observed in the spectral lines of several species. We probe distances from the star between ∼10 and ∼100 au using ALMA observations of the emission of five different molecular lines. High Doppler velocity enhancements of the line emission are observed in the vicinity of the line of sight crossing the star, reminiscent of those recently interpreted as gas streams in the nascent wind of a similar AGB star, EP Aqr.

14p 12120609 23-03-2020 15 2   Download

The localization technology is critical for the application of the WSN. The obstacles induce the larger non-line of sight (NLOS) error and it may decrease the localization accuracy. In this paper, we mainly investigate the non-line of sight localization problem for WSN.

8p vivalletta2711 11-01-2020 8 0   Download

Bài viết đề xuất một phương pháp định vị nguồn bức xạ vô tuyến trong điều kiện địa hình không có tín hiệu LOS (Line Of Sight) khi xét đến hiện tượng phản xạ tín hiệu. Sự phản xạ xảy ra tại bề mặt phẳng, được tính toán theo công thức Fresnel với góc phản xạ và góc tới có giá trị bằng nhau.

4p vicapital2711 02-08-2019 45 1   Download

The vehicular nodes under NLOS situation should be figured effectively, so that the emergency vehicle can communicate to the NLOS node at accurate time period with decreased overhead were the time period depend upon the high degree of channel utilization. In this paper we are going to discuss many such methods proposed by researches by considering the advantages and drawbacks.

9p hongnhan878 12-04-2019 21 0   Download

In this method, cells show a complex behavior by interacting with each other. Image features involving edges, lines, borders and etc can be extracted in machine sight and image processing by using some mathematics operations sight and image processing by using mathematics operations such as edge detection by gradient or by through applying suitable filters. By extracting these features, processing area can be segmented with higher precision. Cellular learning automata can be applied in terms of edge and border detection.

5p byphasse043256 22-03-2019 34 3   Download

Bài báo này trình bày kết quả tìm hiểu phương pháp điều khiển phương tiện thủy trên mặt nước sử dụng thiết bị đẩy khớp nối từ để bám theo các quỹ đạo hình xung vuông hay zig-zag bằng cách sử dụng giải thuật đường ngắm (Line of sight, LOS) kết hợp với bộ điều khiển cuốn chiếu (Backstepping). Hệ thống được xét ở đây sẽ bao gồm 3 khối chính là Dẫn đường – Điều khiển – Vận hành (Guidance – Control – Ship).

9p everydaywish 24-12-2018 90 4   Download

In this paper, the target-tracking problem of a 3-axis camera gimbal mounted on a flying vehicle is considered. In order to keep the camera’s line of sight continuously pointing to a moving target, an optimal controller using LQR control techniques is applied. The motion equations of the gimbal system are derived by the Lagrangian approach considering the vehicle motion.

5p trangcham1896 10-12-2018 44 3   Download

Projection methods are developed along two lines: perspective and parallel. Projection theory comprises the principles used to represent graphically 3-D objects and structures on 2-D media Drawing more than one face of an object by moving your line of sight relative to the object helps in understanding the 3-D form. A line of sight is an imaginary ray of light between an observer's eye and the object.

6p nomoney8 04-04-2017 70 4   Download

In parallel projection, all lines of sight are parallel, the object is positioned at infinity and viewed from multiple points on an imaginary line parallel to the object. The 3-D object is transformed into a 2-D representation or a plane of projection that is an imaginary flat plane upon which the image created by the lines of sight is projected.

4p nomoney8 04-04-2017 53 3   Download

Projection is defined as an image or drawing of an object made on a plane. All drawings used in the field of engineering are based on the principles of projection. That is why engineering drawings are capable to precisely convey the external as well as internal features of objects in terms of their shape and size. Projections can be classified on the basis of line of sight and the position of plane on which the drawing is made.

12p nomoney8 04-04-2017 43 4   Download