Abstract: The present invention generally relates to a compact and wearable screen-less computer system comprises a wearable body worn on a user neck having at least two ends secured through a locking means; an input unit for receiving data input by a user through one of a wired or wireless means; a central processing unit for rendering the data input to generate an output signal to be displayed and transferring to a screen controller; and a virtual projection unit configured for displaying the generated output signal through a virtual projection upon clicking a virtual screen button, wherein the generated output is optionally displayed on a sharing screen while travelling or during outside conference.
Description:FIELD OF THE INVENTION
The present disclosure relates to a compact and wearable screen-less computer system to display input data remotely without the use of screens or any surface.
BACKGROUND OF THE INVENTION
Screenless displays and Wearable devices are going to be the future of today’s fast-moving technological innovation. Screenless Display is a new class of projection-based display devices that combines the latest innovations. Screen-less Display allows users to display any content on a virtual retinal display i.e.., Hologram view. It also allows users to display any content on any surface from a small to a portable wireless device. For example, the display surface can be a wall or table in an office or a home, the ceiling, the side of a camping tent, or even a door.
As the personal computer evolves, one of the major changes that will be seen is how the computer delivers its output to the user. Most future personal computers use screen-less technology. Instead of presenting its visual data on a display screen, the SLD-PC will use a virtual retinal display i.e.., a Hologram view that is laser diodes (red, green, and blue) to protect the data directly without any necessity of a screen. Retinal projectors are being developed by the Human Interface Technology Laboratory at the University of Washington in Seattle and are being further developed and marketed by Micro vision, Inc. Retinal projectors offer more advantages compared to the flat panel and CRT displays now used with personal computers.
Holography's future resides at the nexus of artificial intelligence, digital human technology, and voice cloning. Global computing capacity will continue to rise, enabling the development of digital human models that will render at an ever-increasing rate and become increasingly impossible to distinguish from actual humans. Holographic technology will thereafter advance in terms of availability and portability. Imagine holographic movies, holographic plays, and music performances being one day as widely available as streaming media.
Screen-less display is a part of future technology in the field of displays that are likely to be a game-changer and would change the way displays are used. The screen-less display technology is used to transfer or display information without screen. The improvement in the field of screen-less display would lead to the replacement of touch screen displays by screen-less ones in the near future. In due course of time, hardware component is expected to become inexpensive. This systems technology is not yet developed fully till now and is available in a limited range of products.
In one prior art solution (US10642135B2), a projector is disclosed. The projector allows a user to easily perform work for adjusting a projection position where an image is to be projected onto a screen. However, the disclosed projector is fixed bigger in size and does not promote wireless connection with the user device and any other computing device.
In another prior art solution (US10942437B2), a rotatable projection lens and projector is disclosed. The system provides a projection lens and a projector which can freely set a projection direction without changing a position and a direction of a projector main body. However, it can be seen that the disclosed projector is fixed projector, which cannot be moved easily and cannot be user at desired place at desired time.
However, the prior art solutions are bigger in size and needs professional to operate. In the view of the forgoing discussion, it is clearly portrayed that there is a need to have a compact and wearable screen-less computer system to display input data via a projection. The disclosed system is portable, compact and light weight that can be operated in any place and any time without any connectivity problem.
SUMMARY OF THE INVENTION
The present disclosure seeks to provide a compact and lightweight wearable screen-less computer system for transferring information/data through an electronic video source using a virtual display.
In an embodiment, a compact and wearable screen-less computer system is disclosed. The system includes a wearable body worn on a user neck having at least two ends secured through a locking means. The system further includes an input unit for receiving data input by a user through one of a wired or wireless means. The system further includes a central processing unit for rendering the data input to generate an output signal to be displayed and transferring to a screen controller. The system further includes a virtual projection unit configured for displaying the generated output signal through a virtual projection upon clicking a virtual screen button, wherein the generated output is optionally displayed on a sharing screen while travelling or during outside conference.
In another embodiment, the wired means include USB cable connected to a USB port attached to the wearable body and a card slot to insert a memory card for data input, wherein the wireless means include Bluetooth and Wi-Fi device embedded into the wearable body for receiving data input and from a nearby computing device.
In another embodiment, a battery is embedded into the wearable body to provide electrical energy to the virtual projection unit and the central processing unit through a charging port, wherein the charging port is same port used for USB port.
In another embodiment, a GPS device is coupled to the wearable body to provide real time geo-location, wherein a headphone jack port is coupled to the wearable body to connect a headphone/earphone.
In another embodiment, the system comprises a left speaker disposed to one end and a right speaker disposed to another end of the wearable body to promote surround sound to the user.
In another embodiment, the system comprises a Wi-Fi Indicator to indicate real time wireless connectivity status, and a charge indicator to indicate real time charging status of a battery and charging percentage of a battery, and a power indicator to indicate switch on and switch off state of the system to avoid battery drainage.
In another embodiment, a Bluetooth switch is deployed to switch on/off the Bluetooth device, wherein a virtual screen button is deployed to switch on/off the virtual screen manually, wherein a volume button is deployed to control the volume.
In another embodiment, a microphone is coupled to the wearable body to input audio signal by a user, wherein the audio signal includes an audio command or audio required to be recorded by the user.
In another embodiment, the system comprises an electronic pen wirelessly coupled to the central processing unit to digitally inscribe a handwritten note or drawing on the virtual display or to use a pointer during conference.
In another embodiment, a camera is mounted on the wearable body to capture real time events and use as a web-cam for conference calls and virtual meetings.
An object of the present disclosure is to allow user to interact by simple gestures upon moving their hand or pointing with the finger (gesture).
Another object of the present disclosure is to allow interaction using voice reorganization, e-pen to operate the system.
Another object of the present disclosure is to allow each DMD micromirror can flip thousands of times per second, enabling fast color refresh rates.
Another object of the present disclosure is to provide built-in video streaming applications and Wi-Fi, enabling the Screen-less Display products to provide all functionalities of a smart display.
Another object of the present disclosure is to low display latency makes SLD-PC a great fit for entertainment and business users.
Another object of the present disclosure is to dynamically adjust each RGB Light Emitting Diode to optimize power based on frame-by-frame content.
Yet another object of the present invention is to deliver an expeditious and cost-effective SLD-PC (Screen-Less Display- PC) system that can be worn around the user’s neck.
To further clarify advantages and features of the present disclosure, a more particular description of the invention will be rendered by reference to specific embodiments thereof, which is illustrated in the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. The invention will be described and explained with additional specificity and detail with the accompanying drawings.
BRIEF DESCRIPTION OF FIGURES
These and other features, aspects, and advantages of the present disclosure will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings, wherein:
Figure 1 illustrates a block diagram of a compact and wearable screen-less computer system in accordance with an embodiment of the present disclosure;
Figure 2 illustrates a SLD-PC Device Components in accordance with an embodiment of the present disclosure;
Figure 3 illustrates an exemplary profile of a SLD-PC system in accordance with an embodiment of the present disclosure; and
Figure 4 illustrates Table 1 depicts screen-less display advantages over current display systems.
Further, skilled artisans will appreciate that elements in the drawings are illustrated for simplicity and may not have necessarily been drawn to scale. For example, the flow charts illustrate the method in terms of the most prominent steps involved to help to improve understanding of aspects of the present disclosure. Furthermore, in terms of the construction of the device, one or more components of the device may have been represented in the drawings by conventional symbols, and the drawings may show only those specific details that are pertinent to understanding the embodiments of the present disclosure so as not to obscure the drawings with details that will be readily apparent to those of ordinary skill in the art having benefit of the description herein.
DETAILED DESCRIPTION:
For the purpose of promoting an understanding of the principles of the invention, reference will now be made to the embodiment illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications in the illustrated system, and such further applications of the principles of the invention as illustrated therein being contemplated as would normally occur to one skilled in the art to which the invention relates.
It will be understood by those skilled in the art that the foregoing general description and the following detailed description are exemplary and explanatory of the invention and are not intended to be restrictive thereof.
Reference throughout this specification to “an aspect”, “another aspect” or similar language means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present disclosure. Thus, appearances of the phrase “in an embodiment”, “in another embodiment” and similar language throughout this specification may, but do not necessarily, all refer to the same embodiment.
The terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process or method that comprises a list of steps does not include only those steps but may include other steps not expressly listed or inherent to such process or method. Similarly, one or more devices or sub-systems or elements or structures or components proceeded by "comprises...a" does not, without more constraints, preclude the existence of other devices or other sub-systems or other elements or other structures or other components or additional devices or additional sub-systems or additional elements or additional structures or additional components.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The system, methods, and examples provided herein are illustrative only and not intended to be limiting.
Embodiments of the present disclosure will be described below in detail with reference to the accompanying drawings.
Referring to Figure 1, a block diagram of a compact and wearable screen-less computer system is illustrated in accordance with an embodiment of the present disclosure. The system 100 includes a wearable body 102 worn on a user neck having at least two ends secured through a locking means.
In an embodiment, an input unit 104 is connected to the wearable body 102 for receiving data input by a user through one of a wired or wireless means.
In an embodiment, a central processing unit 106 is connected to the input unit 104 for rendering the data input to generate an output signal to be displayed and transferring to a screen controller 16.
In an embodiment, a virtual projection unit 108 is configured for displaying the generated output signal through a virtual projection upon clicking a virtual screen button 12, wherein the generated output is optionally displayed on a sharing screen while travelling or during outside conference.
In another embodiment, the wired means include USB cable connected to a USB port 2 attached to the wearable body 102 and a card slot 4 to insert a memory card for data input, wherein the wireless means include Bluetooth and Wi-Fi device embedded into the wearable body 102 for receiving data input and from a nearby computing device.
In another embodiment, a battery is embedded into the wearable body 102 to provide electrical energy to the virtual projection unit 108 and the central processing unit 106 through a charging port 2, wherein the charging port 2 is same port used for USB port 2.
In another embodiment, a GPS device is coupled to the wearable body 102 to provide real time geo-location, wherein a headphone jack port 5 is coupled to the wearable body 102 to connect a headphone/earphone.
In another embodiment, the system comprises a left speaker 5 disposed to one end and a right speaker 6 disposed to another end of the wearable body 102 to promote surround sound to the user.
In another embodiment, the system comprises a Wi-Fi indicator 7 to indicate real time wireless connectivity status, and a charge indicator 8 to indicate real time charging status of a battery and charging percentage of a battery, and a power indicator 9 to indicate switch on and switch off state of the system to avoid battery drainage.
In another embodiment, a Bluetooth switch 11 is deployed to switch on/off the Bluetooth device, wherein a virtual screen button 12 is deployed to switch on/off the virtual screen manually, wherein a volume button 15 is deployed to control the volume.
In another embodiment, a microphone is coupled to the wearable body 102 to input audio signal by a user, wherein the audio signal includes an audio command or audio required to be recorded by the user.
In another embodiment, the system comprises an electronic pen 13 wirelessly coupled to the central processing unit 106 to digitally inscribe a handwritten note or drawing on the virtual display or to use a pointer during conference.
In another embodiment, a camera 14 is mounted on the wearable body 102 to capture real time events and use as a web-cam for conference calls and virtual meetings.
Figure 2 illustrates a SLD-PC Device 106 Components in accordance with an embodiment of the present disclosure. Screenless computing systems can be divided mainly into 3 groups: a) Visual image, b) Retinal Display or Virtual Retinal Display, c) Holographic technology.
a) Visual Image: in this type of screen less display our eye perceives the images that are formed in the air without using any kind of screens. One of the well-known examples of visual image is Hologram. Visual image uses light and thus reflected light from the intermediate object is captured.
b) Retinal Display or Virtual Retinal Display: this category of screenless displays the images directly on the retina of the human’s eye. In this, the light is not reflected from any intermediate object, as it is directly projected on the eye. Thus this makes retinal display different from the visual image. The visibility of images is limited to the person only and the user feels that the images are floating in the air. Hence it can also be called a personal display computer. This property of retinal display makes it highly secure, safe, and private. One of the best examples of the retinal display is Google Glass.
Google Glass is just like traditional glass. It consists of a block of glass on one eye that allows the user to see amplified reality. Images as well as text and information about objects are shown right in front of the user's eye. Retinal eye display is in its early stage of progress.
c) Holographic technology: This form of photography provides a 3D (3-Dimensional) image, and few technologies are now creating images using lenses, helium-neon, and holograph film. Scientists do not have a fully working holograph table prepared for the market in the future. Holographs can work by using a laser beam that can interfere with an object beam. When these 2 beams get in the way of one another, they can create what looks like a 3D image. This image will be then recorded for processing by recording the diffraction of the light and the way in which the beams interfere with one another.
High optical efficiency: SLD-PC 106 can work with any light source including LEDs, lasers, laser-phosphor, or lamps and offers very high visual efficiency. The result of this is a high brightness display with low power consumption, which is mainly a good fit for high brightness display applications such as Screen-less Display. Low power consumption also allows battery operation for a cable-less experience. Varied choice of display resolution chipsets: SLD-PC 106offers a varied range of display ranges from small-resolution – nHD ( 641 × 360 ), WVGA ( 856 × 480 ) to HD-resolution – WXGA ( 1250 × 806 ), HD ( 1250 × 720 ) and Full-HD ( 1928 × 1080 ) resolutions. This provides the system designer with flexibility in planning and differentiating products across size, resolution, brightness, battery requirements, and cost levels. High contrast: Depending on the visual design, SLD-PC can enable a high contrast ratio, which creates deep blacks and it improves perceived image brightness and quality. High speed: Each DMD micromirror can flip thousands of times per second, enabling fast color refresh rates. In addition, low display latency makes SLD-PC a great fit for entertainment and business users. Advanced image processing algorithms: The ability to dynamically adjust each RGB Light Emitting Diode to optimize power based on frame-by-frame content. This device is easy to carry and compatible, flexible, and portable.
SLD-PC is a wearable device that is worn around the user’s neck and can overcome all the disadvantages of existing systems. This wearable technology is a PC (Personal Computer) where a user can interact with it by simple gestures that is moving their hand or pointing with finger (gesture). This wearable technology can also be interacted using voice-recognition, gesture and e-Pen 13.
Working procedure of SLD-PC:
Power button 1 is given; on Click of this button starts up the device. As the button is clicked, the device projects a virtual screen in 3D form. In now a day’s connectivity is very important for a normal human to share files or make use of existing device to get connected Bluetooth and Wi-Fi feature 7 is included. Screen-Less display mainly speaks about Projection, if else a user just want to use the device without the screen user can make use of button to OFF the projection screen 108. The user can retrieve the projection screen by just click of the projection button. Along with the proposed system there is e-pen 13; Operation of SLD-PC can be done using the e-pen 13 too, user can make use e-pen 13 to scroll which is similar to the normal PC mouse we use. Screen Control Button: usually default size will be set; with this e-pen 13 a user can adjust the size of the screen depending on the user’s comfortable with the view. Webcam 14 is an in-built feature in the e-pen 13; with this many users can use to make video calling or video conference or can simply click photos. Volume control buttons is provided to users so that when the user uses the head jack 4 this volume control button is used to adjust the volume according to the user as they want.
Intel announces Edison, a processor with SD Card sized Intel for wearable devices.
Figure 3 illustrates an exemplary profile of a SLD-PC system in accordance with an embodiment of the present disclosure. A tiny processor is built by Intel at CES 2014, Intel CEO Brian Krzanich announced Edison, a full Pentium-class PC that's the size and shape of the SD card. It's powered by a dual-core Quark SOC, runs Linux, and has built-in Bluetooth connectivity and Wi-Fi 7. Intel has a precise app store designed for Edison, and a distinctive version of Wolfram that will come to the tiny computer.
Power consuming wearable devices could become smaller with a new re-chargeable battery from Panasonic. Panasonic announced a "pin-shaped" lithium-ion battery that's 20 mm (.03 inches) long with a diameter of 3.5 mm. The CG-320 battery has a minimal capacity of 13mAh and voltage of 3.75V. It is compact and less weight which makes it ideal for wearable devices such as fitness bands, smart glasses and hearing aids as well as electronic pens.
Mini portable wearable wireless Bluetooth speaker 5 and 6 with built-in Mic 13 and Camera 14 is pocket sized and light weight to take anywhere. It got best quality sound.
Proposed SLD-PC Architecture
SLD-PC is light weighted; it is a semicircle shaped device which has a small projector 10 on right of the device for projection, which helps the user to view the screen. One can operate this device using hand gestures or e-pen 13 or by voice recognition.
1)Power Button 2)Charging and USB Port 3)SD Card slot 4)Head Phone Jack Port 5)Left Speaker 6)Right Speaker 7)Wi-Fi Indicator 8)Charge Indicator 9)Power Indicator 10)Projection 11)Bluetooth Switch 12)Virtual screen Button 13)Mic. E-PEN:14) Web-Cam 15)Volume Button 16)Screen Controller 17) front side view of E-PEN and 18) rear side view of E-PEN.
Screen-less Display Advantages over Current Display systems
Screen-less – No fixed screen or display panel is required, allowing content to be displayed on virtually any surface. SLD-PC is portable, there is no fixed installation required. It enables screen-less display products to be easily moved or worn around the neck. Quick Set Up, no fixed installation or mounting on the wall or placement on a pedestal required – allowing Screen-less Display product to just power on and create a stunning display. Improved Performance – No fixed screen required, allowing the display to be only visible when required and invisible when turned off. Once the display is off, the display aesthetics are kept in their natural state; without compromise therefore there is no display panel to view the screen all of the time. This system is very smart: Built-in video streaming applications and Wi-Fi, enabling Screen-less Display products to provide all functionalities of a smart display. Its main advantage is to reduce the size of Laptops by not compromising on its features and also to implement the virtual/ screen-less Display system. Hence it is very useful for business purposes, personal use, entertainment, video conference, and college/School purpose as depicted in Table 1.
The screen-less display system 100 is one of the emerging technology and has an increasing vision for the near future in the field of computer-enhanced technologies. This system deals with the display of several things without the use of screens or any surface. It is a system of transferring information/data through an electronic video source using a Retinal Display. An innovative and new system i.e., SLD-PC (Screen-Less Display-Personal Computer) which is a lightweight wearable device and this system has features similar to Laptops and tablets. This proposed system would bring a new era in the field of displays and monitors that are costly, huge, and they are proven difficult to manage needs and constraints. It is also an advanced technological innovation and is going to be one of the best technological development in the upcoming years.
The developed system 100 provides a novel and innovative Wearable SLD-PC (Screen-Less Display-Personal Computer). This is a smart device that has built-in video streaming applications and Wi-Fi, enabling the Screen-less Display products to provide all functionalities of a smart display. Its main advantage is to reduce the size of Laptops by not compromising on its features and also to implement the virtual/ screen-less Display system. The limitations of this device are i) It has an on-screen keyboard system that is projection based which will disrupt privacy. ii) It has limited battery backup. The innovative and new system i.e.., SLD-PC (Screen-Less Display- PC) is a wearable device that can be worn around the user’s neck. This is a kind of PC (Personal Computer) where a user can interact with it by simple gestures that are by moving their hand or pointing with the finger (gesture) and can also be interacted with using voice reorganization, e-pen to operate the system. The main advantage of this device is Low power requirement, low cost, wider view, high portability and enhanced speed are some of the factors which drive this technology better than existing systems.
Figure 4 illustrates Table 1 depicts screen-less display advantages over current display systems.
The future enhancement of the proposed system is i) To implement a Solar battery for a power system. ii) For cooling of the system processors can be replaced with SOC (System on chip).
In turn, the evolution of holographic technologies will lead to their increasing availability and portability. Imagine if holographic content could one day be as accessible as streaming content: holographic cinema, holographic theater, music shows.
The drawings and the forgoing description give examples of embodiments. Those skilled in the art will appreciate that one or more of the described elements may well be combined into a single functional element. Alternatively, certain elements may be split into multiple functional elements. Elements from one embodiment may be added to another embodiment. For example, orders of processes described herein may be changed and are not limited to the manner described herein. Moreover, the actions of any flow diagram need not be implemented in the order shown; nor do all of the acts necessarily need to be performed. Also, those acts that are not dependent on other acts may be performed in parallel with the other acts. The scope of embodiments is by no means limited by these specific examples. Numerous variations, whether explicitly given in the specification or not, such as differences in structure, dimension, and use of material, are possible. The scope of embodiments is at least as broad as given by the following claims.
Benefits, other advantages, and solutions to problems have been described above with regard to specific embodiments. However, the benefits, advantages, solutions to problems, and any component(s) that may cause any benefit, advantage, or solution to occur or become more pronounced are not to be construed as a critical, required, or essential feature or component of any or all the claims.
, Claims:WE CLAIM:
1. A compact and wearable screen-less computer system, the system comprises:
a wearable body worn on a user neck having at least two ends secured through a locking means;
an input unit for receiving data input by a user through one of a wired or wireless means;
a central processing unit for rendering the data input to generate an output signal to be displayed and transferring to a screen controller; and
a virtual projection unit configured for displaying the generated output signal through a virtual projection upon clicking a virtual screen button, wherein the generated output is optionally displayed on a sharing screen while travelling or during outside conference.
2. The system as claimed in claim 1, wherein the wired means include USB cable connected to a USB port attached to the wearable body and a card slot to insert a memory card for data input, wherein the wireless means include Bluetooth and Wi-Fi device embedded into the wearable body for receiving data input and from a nearby computing device.
3. The system as claimed in claim 1, wherein a battery is embedded into the wearable body to provide electrical energy to the virtual projection unit and the central processing unit through a charging port, wherein the charging port is same port used for USB port.
4. The system as claimed in claim 1, wherein a GPS device is coupled to the wearable body to provide real time geo-location, wherein a headphone jack port is coupled to the wearable body to connect a headphone/earphone.
5. The system as claimed in claim 1, wherein said system comprises a left speaker disposed to one end and a right speaker disposed to another end of the wearable body to promote surround sound to the user.
6. The system as claimed in claim 1, wherein said system comprises a Wi-Fi Indicator to indicate real time wireless connectivity status, and a charge indicator to indicate real time charging status of a battery and charging percentage of a battery, and a power indicator to indicate switch on and switch off state of the system to avoid battery drainage.
7. The system as claimed in claim 1, wherein a Bluetooth switch is deployed to switch on/off the Bluetooth device, wherein a virtual screen button is deployed to switch on/off the virtual screen manually, wherein a volume button is deployed to control the volume.
8. The system as claimed in claim 1, wherein a microphone is coupled to the wearable body to input audio signal by a user, wherein the audio signal includes an audio command or audio required to be recorded by the user.
9. The system as claimed in claim 1, wherein said system comprises an electronic pen wirelessly coupled to the central processing unit to digitally inscribe a handwritten note or drawing on the virtual display or to use a pointer during conference.
10. The system as claimed in claim 1, wherein a camera is mounted on the wearable body to capture real time events and use as a web-cam for conference calls and virtual meetings.
| # | Name | Date |
|---|---|---|
| 1 | 202241069592-FORM FOR SMALL ENTITY(FORM-28) [02-12-2022(online)].pdf | 2022-12-02 |
| 2 | 202241069592-FORM FOR SMALL ENTITY [02-12-2022(online)].pdf | 2022-12-02 |
| 3 | 202241069592-FORM 3 [02-12-2022(online)].pdf | 2022-12-02 |
| 4 | 202241069592-FORM 1 [02-12-2022(online)].pdf | 2022-12-02 |
| 5 | 202241069592-EVIDENCE FOR REGISTRATION UNDER SSI(FORM-28) [02-12-2022(online)].pdf | 2022-12-02 |
| 6 | 202241069592-ENDORSEMENT BY INVENTORS [02-12-2022(online)].pdf | 2022-12-02 |
| 7 | 202241069592-EDUCATIONAL INSTITUTION(S) [02-12-2022(online)].pdf | 2022-12-02 |
| 8 | 202241069592-DRAWINGS [02-12-2022(online)].pdf | 2022-12-02 |
| 9 | 202241069592-COMPLETE SPECIFICATION [02-12-2022(online)].pdf | 2022-12-02 |
| 10 | 202241069592-FORM 18 [08-12-2022(online)].pdf | 2022-12-08 |
| 11 | 202241069592-Proof of Right [15-02-2023(online)].pdf | 2023-02-15 |
| 12 | 202241069592-FORM-26 [15-02-2023(online)].pdf | 2023-02-15 |