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2021 ◽  
Vol 2083 (4) ◽  
pp. 042074
Author(s):  
Wuzhou Li ◽  
Shicong Lin ◽  
Zehui Liu

Abstract Laser guidance is a continuous process, during which a lot of operational data and corresponding changes are generated. Aiming at the live-fire drill shooting training and assessment evaluation of a certain type of laser-guided missile, this paper analyzes the principle of laser guidance, studies the weighting system of the information field based on the importance of characteristic intervals, integrates and processes the data and outputs the aiming effect picture and sheet, and constructs the aiming and tracking ability evaluation model. Stationary targets and moving targets are tested respectively, and the verification model can realize the calculation of laser information field, the integration of coordinate data, the output of aiming effect diagram, and the evaluation of the shooter’s aiming and tracking ability expressed in a percentage system. The model realizes data collection, integration and processing based on MATLAB software, and builds graph and table output ports, which can realize low delay processing of a large amount of short-term data.


2021 ◽  
Author(s):  
Yu Xiang ◽  
Liwei Hu ◽  
Jun Zhang ◽  
Wenyong Wang

Abstract The perception of geometry-features of airfoils is the basis in aerodynamic area for performance prediction, parameterization, aircraft inverse design, etc. There are three approaches to percept the geometric shape of an airfoil, namely manual design of airfoil geometry parameter, polynomial definition and deep learning. The first two methods can directly extract geometry-features of airfoils or polynomial equations of airfoil curves, but the number of features extracted is limited. While deep learning algorithms can extract a large number of potential features (called latent features), however, the features extracted by deep learning are lacking of explicit geometrical meaning. Motivated by the advantages of polynomial definition and deep learning, we propose a geometry-based deep learning feature extraction scheme (named Bézier-based feature extraction, BFE) for airfoils, which consists of two parts: manifold metric feature extraction and geometry-feature fusion encoder (GF encoder). Manifold metric feature extraction, with the help of the Bézier curve, captures features from tangent space of airfoil curves, and GF encoder combines airfoil coordinate data and manifold metrics together to form a novel feature representation. A public UIUC airfoil dataset is used to verify the proposed BFE. Compared with classic Auto-Encoder, the mean square error (MSE) of BFE is reduced by 17.97% ~29.14%.


2021 ◽  
Vol 11 (19) ◽  
pp. 8826
Author(s):  
Seong-Geun Kwon ◽  
Oh-Jun Kwon ◽  
Ki-Ryong Kwon ◽  
Suk-Hwan Lee

In this paper, we address a system that can accurately locate and monitor work tools in a complex assembly process, such as automotive production. Our positioning monitoring system is positioned by a combined sensor of the UWB module and the MEMS IMU (inertial measuring unit) sensor based on the extended Kalman filter. The MEMS IMU sensor provides the positioning calibration information. The proposed method incorporates IMU and UWB positioning to compensate for errors that can only occur in UWB positioning through the extended Kalman filter (EKT). This EKT is improved by the error dynamic equation derived from the sparse state-space matrix. Also, the proposed method computes the transmission time and distance between the tag and anchor of the UWB module by the TWR (two-way range) system. The tag of a mobile node, which is attached to a moving tool, measures the position of the work tool and transmits the position coordinate data to the anchor. Here, the proposed method uses the trilateration localization method by the confidence distance compensation to prevent the distance error by obstacles and changes in the indoor environment. Experimental results verified that the proposed method confirms whether a specific tool is accurately used according to the prescribed regulations and has more positioning accuracy than the conventional methods.


2021 ◽  
Vol 7 (2) ◽  
pp. 217
Author(s):  
Muhammad Hanifudin Al Fadli ◽  
Dadang Gunawan ◽  
Romie Oktovianus Bura ◽  
Larasmoyo Nugroho

<div><p class="Els-history-head">The Anti-Tank Guided-Missile (ATGM) system has a very important role in the modern battlefield. This system proved its effectiveness in many modern conflicts such as the Syrian Civil War and Nagorno-Karabakh War. The ATGM system has a very simple electronic and mechanism but it has a very high level of accuracy and precision. One of the control methods used in ATGM is SACLOS method. This method tracks missile position by detecting an infrared lamp that is placed on the missile tail. The tracking system sends control signals to the missile as a result of the correction of the missile position when flying. The infrared tracking system in this research was made using a modified OV5647 camera with the addition of a 940 nm narrow bandpass filter. There are 3 cameras with 1x, 8x, and 16x magnifications which are accessed using 3 Raspberry Pi boards. X and y coordinate data of the infrared lamp is sent to the airframe using wireless telemetry. Atmega328 microcontroller process x and y coordinate data into input proportional control. The result of this research is the prototype of an anti-tank missile control system with an infrared tracking instrument capable track a series of 88 infrared LEDs as far as 997.16 meters with a tracking speed of 90.11 FPS. The threshold parameters of image processing using luminance of YUV color space has a range of 240-255. The control parameter Kp=7 is used in wind tunnel testing with airspeed 20 m/s capable of directing airframe motion to the telescope's crosshairs.</p></div>


2021 ◽  
Vol 2 (Mei) ◽  
pp. 10-15
Author(s):  
Rindah Sulasmi ◽  
Desyderius Minggu ◽  
Muhamat Maariful Huda

Nowadays, the virtual world is not something new. The role of the virtual world relies heavily depend on communication to report the situation and condition as soon as the position of soldiers in the military world, to carrying out their assignments and training. To support this task, a tool for determining coordinates using HT (Handy Talky) was made by transmitting real-time GPS (Global Position System) data based on IoT (Internet of Things) using the internet protocol network as the transmission medium. With the GPS system, latitude and longitude data will be obtained from the GPS module. The results of data will be processed by the Microcontroller, which we use the Arduino Pro Micro module then sent to the Monitoring server which will be shown in the form of mapping and show coordinate data, observers can monitor the position of field personnel who are carrying out patrols according to their area.


PLoS ONE ◽  
2021 ◽  
Vol 16 (5) ◽  
pp. e0251292
Author(s):  
Tomohiro Kai ◽  
Shin Hirai ◽  
Yuhei Anbe ◽  
Yohei Takai

Background and aims Soccer players frequently perform change-of-directions (CODs) at various speeds during matches. However, tracking systems have shown limitations to measure these efforts. Therefore, the aim of the present study was to propose a new approach to measure CODs using a local positioning system (LPS), and clarify position-related difference in profile of CODs by using the approach. Methods The x- and y-coordinate data for each soccer player were measured with a local positioning system. Speed, acceleration, jerk, and direction of speed were derived from the coordinate data. Based on accelerations of above 2 m/s2, the onsets and ends of CODs derived from jerk were identified (COD duration). Changes of direction of speed (θCOD) were determined for the corresponding period. Six collegiate male soccer players performed CODs according to 13 set angles (0–180°; every 15°) so that differences between θCOD and set angle could be determined (Exp. 1). Relative frequency distributions of θCOD and number of CODs were determined in 79 collegiate and amateur male soccer players during 9 soccer matches (Exp. 2). Results In Exp. 1, θCOD was positively related to set angle (r = 0.99). Each θCOD was smaller than the corresponding set angle, and the difference became greater with increasing COD angle. In Exp. 2, The number of CODs in a match was 183 ± 39 across all positions. There were no significant position-related differences in the number of CODs. The duration of a COD was 0.89 ± 0.49 s across all positions. The relative frequency distribution of θCOD revealed that the number of CODs at 0–15° and 105–135° tended to be higher than those at other angles during soccer matches. Further, θCOD was affected by the speed at the onset of COD during soccer matches (Exp. 2). Conclusions The current findings demonstrate that θCOD derived from direction of speed and jerk may be a new indicator for evaluating COD during soccer matches.


Author(s):  
I Putu Yoga Pertama Yasa ◽  
I Ketut Gede Darma Putra ◽  
Dewa Made Sri Arsa

Tanah Lot Temple is located in Beraban Village, Kediri District, Tabanan Regency. Tanah Lot Temple is a temple that is included in the Dang Kahyangan Temple. Tanah Lot Temple has buildings scattered in the Tanah Lot Temple Tourism Object. Not all of the buildings in Tanah Lot Temple are known by tourists. Augmented Reality is a visual technology that combines objects or virtual worlds into real-world views in real-time. This study used markerless method and was developed using the Wikitude library and supported by web hosting to store information data and building coordinate data. The system in this study runs dynamically, making it easier to manage data without modifying the program code. Augmented Reality application results with real object marker of Tanah Lot Temple are that it can display information in the form of text narrative and location points along with voice explanations for each building in Tanah Lot Temple.


2021 ◽  
Vol 8 (1) ◽  
pp. 32
Author(s):  
Ahmad Hajar ◽  
Isnan Nabawi ◽  
Lili Kartikawati ◽  
Fadya Rizka Yudana ◽  
Setia Budi ◽  
...  

Perkembangan teknologi Informasi yang berkembang pesat sudah menyentuh ilmu pengetahuan lain seperti perkembangan Sistem Informasi Geografis (SIG). Teknologi SIG memungkinkan sistem dapat menentukan lokasinya dengan memanfaatkan banyak masukan seperti satelit, RFID, WIFI. Geolocation dapat memberikan informasi latitude dan longitude disebut juga dengan koordinat geografis yang merupakan informasi mendasar dari sebuah lokasi di bumi. Basis data dibutuhkan untuk mengembangkan SIG. MySQL sudah mendukung penyimpanan tipe data spasial yang salah satu kelasnya adalah point yang dapat menyimpan data koordinat latitude, longitude dan SRID. Penelitian bertujuan menerapkan teknologi dalam melakukan penyimpanan, memanipulasi data koordinat geografis dan pengolahannya sehingga mendapatkan informasi yang dibutuhkan. Penerapan penelitian dilakukan dengan menambahkan data lokasi beberapa rumah sakit yang ada di kota Yogyakarta, mengubah data lokasi, menampilkan rumah sakit yang terdekat dari titik tertentu, dan menampilkan rumah sakit pada radius tertentu dari titik tertentu. Penelitian membuktikan bahwa tipe data spasial yang menampung data lokasi berupa latitude dan longitude rumah sakit dapat diolah untuk memberikan informasi pencarian rumah sakit terdekat di Yogyakarta dari radius kurang dari sama dengan 3 kilo meter dari titik 110.361994, -7.764768 dalam database yang telah dimiliki.Kata Kunci Data Spasial, Geolocation, Koordinat Geografis, MySQL.The development of information technology that is growing rapidly has touched other sciences such as the development of Geographical Information Systems (GIS). GIS technology allows the system to determine its location by utilizing many inputs such as satellite, RFID, WIFI. Geolocation can provide latitude and longitude information - geographic coordinates which are basic information about a location on earth. Database development to support GIS. MySQL supports the storage of spatial data types, a point class that can store latitude, longitude and SRID coordinate data. This study intends to apply geolocation technology, especially in terms of storing, manipulating geographic coordinate data and processing it so that it gets the information needed. The application of research was carried out by adding the location data of several hospitals in the city of Yogyakarta, change the location data, display the closest hospital from a certain point, and display the hospital in a certain radius from a certain point. Experiments will prove that the spatial data type can be used to obtain search information for the nearest hospital in Yogyakarta from a radius less than 3 kilometers from the point 110.361994, -7.764768 in the database that has been provided.Keywords: Spatial Data, Geolocation, Geographical Coordinates, MySQL.


2021 ◽  
Author(s):  
Jennifer N Lehrman ◽  
Celene B Mulholland ◽  
Bernardo de Andrada Pereira ◽  
Anna G U Sawa ◽  
Brian P Kelly ◽  
...  

Abstract BACKGROUND The risk of interlaminar passage of a dilator into the lumbar spinal canal in minimally invasive approaches is currently unknown. Among anthropometric data reported in the medical literature, there is no cadaveric report of the interlaminar dimensions of the lumbar spine. OBJECTIVE To report the lumbar interlaminar dimensions in neutral, flexion, and extension postures. METHODS A total of 8 spines were sectioned into lumbar segments. Digitized coordinate data defining the locations and movements of chosen anatomic points on the laminar edges at a given spinal level were used to measure changes in the opening dimensions during static neutral posture and flexion-extension movements. Interlaminar dimensions were averaged and categorized for each vertebral level and spinal posture. RESULTS The mean interlaminar distance increased from neutral posture to flexion across all vertebral levels. The mean interlaminar distances in the neutral posture ranged from 12.21 mm (L5-S1) to 14.88 mm (L1-L2). In flexion, the range was from 17.15 mm (L5-S1) to 18.50 mm (L4-L5). These measurements are greater than the first several diameters of dilators in all minimally invasive dilator sets. CONCLUSION The precise measurements of the lumbar interlaminar space are valuable to minimally invasive spine surgeons for the dilatation phase of the operation. The risk of interlaminar passage of a minimally invasive dilator is greatest in flexion with dilators that have a diameter of 16 mm or less. There is considerably less risk of interlaminar passage in patients positioned on an extended Jackson table.


2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Jiu-yang Huan ◽  
Zhi-qiang Zhang ◽  
Ming-ming He ◽  
Ning Li

The mechanical properties of joints are important factors affecting the safety and stability of rock mass. The joint roughness coefficient (JRC) is a parameter for describing the roughness morphology of the joint surface, and its accurate quantification is very important to predict the shear strength. In the current statistical parameter methods for the estimation of joint roughness, the size of different protrusions on the joint surface was completely ignored, which did not correspond to the real failure mechanism of rock joint during the shear process. In this study, a new statistical parameter WPA was proposed for the estimation of JRC considering the shear direction and the contributions of different protrusions. First, the 10 standard roughness joint profiles were digitized based on image processing technology, and the obtained coordinate data were proved to be reliable by the calculation results of existing parameters. Secondly, the WPA value of 10 standard roughness joint profiles was calculated at a 0.5 mm sampling interval in two directions. The functional relationship between WPA and JRC indicated that they should be established in the same shear direction to maintain a high correlation. The JRC values of 10 standard roughness joint profiles in direction 2 were obtained based on the functional relationship established between WPA and JRC in direction 1, and the roughness of these 10 joint profiles was confirmed to be influenced by direction. Next, the effect of sampling interval on WPA was investigated. As the sampling interval increases, the WPA values gradually decreased and the correlation between them and JRC gradually declined. In practical application, a smaller sampling interval was recommended for more accurate prediction. Finally, the geometric coordinate data of 21 joint profiles given in the literature and 4 natural joint surfaces were obtained by graphics processing technology and 3D scanning technology, respectively. The JRC values of them were separately estimated by WPA in different directions. The results showed that the new statistical parameter WPA proposed in this paper can well describe the joint roughness considering the shear direction and the contribution of different protrusions.


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