WO2023209758A1 - センシングシステム、センシング機器、及びセンシング方法 - Google Patents

センシングシステム、センシング機器、及びセンシング方法 Download PDF

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Publication number
WO2023209758A1
WO2023209758A1 PCT/JP2022/018682 JP2022018682W WO2023209758A1 WO 2023209758 A1 WO2023209758 A1 WO 2023209758A1 JP 2022018682 W JP2022018682 W JP 2022018682W WO 2023209758 A1 WO2023209758 A1 WO 2023209758A1
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Prior art keywords
optical fiber
optical
vibration
sensing
predetermined
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PCT/JP2022/018682
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English (en)
French (fr)
Japanese (ja)
Inventor
忠行 岩野
洸遥 森
幸英 依田
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NEC Corp
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NEC Corp
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Priority to PCT/JP2022/018682 priority Critical patent/WO2023209758A1/ja
Priority to JP2024517616A priority patent/JPWO2023209758A1/ja
Publication of WO2023209758A1 publication Critical patent/WO2023209758A1/ja
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for

Definitions

  • the present disclosure relates to a sensing system, sensing equipment, and sensing method.
  • connecting devices such as patch panels are placed between devices such as servers and computers in order to connect them using optical fibers.
  • the optical fiber used to connect the device is also removed.
  • the optical fiber connected to the device is to be removed, it is possible to easily identify the optical fiber to be removed.
  • the connected device cannot correctly determine which optical fiber is to be removed. Therefore, on the connected equipment side, there is a risk that the optical fiber in operation may be accidentally removed. As a result, communication during operation may be erroneously disconnected.
  • an optical unit connects one optical fiber in the optical cable to be identified among a large number of optical cables, and detects a phase difference and a time difference with respect to that one optical fiber. Send two optical signals. Then, the optical unit detects the phase difference between two optical signals reflected by external scattering generated by a remote worker hitting an optical fiber, converts the detected optical signal into sound, and generates a sound. 1 communication device to a remote worker's second communication device. The remote worker identifies that the optical cable selected by the remote worker is correct if the sounds heard through the first communication device and the second communication device are the same.
  • an observer performs an optical pulse test on a plurality of optical fibers in advance to obtain a test waveform.
  • the operator selects one of the plurality of optical fibers, applies a bending loss as a disturbance to the selected optical fiber, and notifies the observer that the bending has been applied.
  • the observer performs the optical pulse test again with the optical fiber bent, obtaining a waveform and comparing it with the test waveform.
  • the reflection from the far end disappears or attenuates, and the reflection peak disappears from the waveform. Utilizing this fact, it is determined whether the optical fiber is currently in use or not.
  • Patent Document 1 it is necessary to transmit two optical signals with a phase difference and a time difference to an optical fiber, and the phase difference between the two optical signals reflected by external scattering, etc. It is necessary to detect the optical signal and convert the detected optical signal into sound.
  • Patent Document 2 it is necessary to perform a light pulse test on a plurality of optical fibers in advance to understand the position and number of reflection peaks. Therefore, it is desired to suppress erroneous removal of optical fibers by a simpler method.
  • an object of the present disclosure is to provide a sensing system, a sensing device, and a sensing method that can suppress erroneous removal of an optical fiber using a simpler method.
  • a sensing system includes: multiple optical fibers, Communication in which at least one optical fiber of the plurality of optical fibers is connected and transmits pulsed light to the connected at least one optical fiber and receives an optical signal from the at least one optical fiber.
  • Department and a determination unit that determines whether or not the predetermined vibration has occurred in the at least one optical fiber, based on a vibration pattern indicating the predetermined vibration included in the optical signal received from the at least one optical fiber; , Equipped with
  • a sensing device includes: A communication unit to which at least one optical fiber of the plurality of optical fibers is connected, and transmits pulsed light to the connected at least one optical fiber and receives an optical signal from the at least one optical fiber. and, a determination unit that determines whether or not the predetermined vibration has occurred in the at least one optical fiber, based on a vibration pattern indicating the predetermined vibration included in the optical signal received from the at least one optical fiber; , Equipped with
  • a sensing method includes: A sensing method using a sensing device, At least one optical fiber among the plurality of optical fibers is connected to the sensing device, The sensing method includes: a communication step of transmitting pulsed light to the at least one connected optical fiber and receiving an optical signal from the at least one optical fiber; a determination step of determining whether or not the predetermined vibration has occurred in the at least one optical fiber, based on a vibration pattern indicating the predetermined vibration included in the optical signal received from the at least one optical fiber; , including.
  • FIG. 1 is a diagram showing a configuration example of a sensing system according to Embodiment 1.
  • FIG. 3 is a diagram showing an example of a vibration pattern of vibrations artificially generated in an optical fiber.
  • FIG. 6 is a diagram illustrating an operation example in which a user sequentially applies pressure to a plurality of optical fibers one by one on the patch panel side in the sensing device according to the first embodiment.
  • FIG. 6 is a diagram illustrating an operation example in which a user sequentially applies pressure to a plurality of optical fibers two at a time on the patch panel side in the sensing device according to the first embodiment.
  • FIG. 2 is a flow diagram illustrating an example of a schematic operation flow of the sensing device according to the first embodiment.
  • FIG. 3 is a diagram illustrating a configuration example of a sensing system according to a second embodiment.
  • FIG. 7 is a diagram illustrating a configuration example of a sensing system according to a third embodiment. 7 is a diagram showing an example of a GUI screen displayed on a display device by a notification unit according to Embodiment 3.
  • FIG. 12 is a flow diagram illustrating an example of a schematic operation flow of a sensing device according to Embodiment 3; It is a figure showing the example of composition of the sensing system concerning other embodiments.
  • FIG. 2 is a block diagram showing an example of a hardware configuration of a computer that implements a sensing device according to an embodiment.
  • the sensing system includes a plurality of optical fibers 10-1 to 10-7 and a sensing device 20.
  • optical fibers 10 the number of optical fibers 10 is seven in FIG. 1, this is an example, and the number of optical fibers 10 may be plural.
  • One end of the plurality of optical fibers 10 is connected to each port of the patch panel 30.
  • Patch panel 30 is an example of a connected device.
  • the optical fiber 10 may be connected to the sensing device 20 and the patch panel 30, for example, in the form of an optical fiber cable that covers the optical fiber 10.
  • the optical fiber 10 that was connected to the device to be removed becomes the target for removal. Further, it is assumed that the distance between the device to be removed and the patch panel 30 is large, and it is not possible to determine which optical fiber 10 among the plurality of optical fibers 10 is to be removed when viewed from the patch panel 30 side.
  • the first embodiment enables the patch panel 30 to determine which optical fibers 10 are to be removed under the above-mentioned circumstances.
  • the other end of one optical fiber 10 to be removed is connected to the sensing device 20 (specifically, the communication section 21 described below).
  • the sensing device 20 specifically, the communication section 21 described below.
  • two or more optical fibers 10 to be removed may be connected to the sensing device 20, as described in Embodiment 2 below. That is, the number of optical fibers 10 to be removed connected to the sensing device 20 may be at least one.
  • the sensing device 20 includes a communication section 21 and a determination section 22.
  • the determination unit 22 may be provided in a separate device different from the sensing device 20, or may be provided on the cloud.
  • the sensing device 20 is realized by, for example, a DVS (Distributed Vibration Sensing) device, a DAS (Distributed Acoustic Sensing) device, or the like.
  • one optical fiber 10 to be removed is connected to the communication unit 21.
  • the communication unit 21 transmits pulsed light to the connected optical fiber 10. Then, as the pulsed light is transmitted through the optical fiber 10, backscattered light is generated.
  • the communication unit 21 receives the backscattered light from the connected optical fiber 10 as an optical signal.
  • a user sequentially applies pressure to a plurality of optical fibers 10 on the patch panel 30 side by hitting them with a stick or the like. This compression causes artificial vibrations to occur in the optical fiber 10.
  • the optical fiber 10 can detect artificial vibrations caused by compression, and the optical signal transmitted through the optical fiber 10 includes vibration strength, vibration position, etc., depending on the artificial vibration. This will include unique vibration patterns with different values.
  • the determination unit 22 determines whether artificial vibration (predetermined vibration) is detected in the connected optical fiber 10 based on the vibration pattern indicating artificial vibration due to compression, which is included in the optical signal received by the communication unit 21. ) has occurred.
  • the determination unit 22 can obtain vibration data as shown in FIG. 2 by analyzing the optical signal received by the communication unit 21 from the optical fiber 10 connected to the communication unit 21.
  • FIG. 2 shows vibration data of vibrations generated in the optical fiber 10, where the horizontal axis is time and the vertical axis is vibration intensity.
  • the determination unit 22 can determine that artificial vibration has occurred in the connected optical fiber 10.
  • the determination unit 22 determines that artificial vibrations due to compression have occurred in the connected optical fiber 10
  • the user on the patch panel 30 side can determine whether the optical fiber 10 that was being compressed at that time is to be removed. It can be determined that
  • the operation of the sensing device 20 will be explained in more detail.
  • FIG. 3 an example of the operation of the sensing device 20 in a case where a user applies compression to a plurality of optical fibers 10 one by one on the patch panel 30 side will be described.
  • the optical fiber 10 to be removed is the optical fiber 10-2.
  • the communication unit 21 is connected to the optical fiber 10-2 to be removed.
  • the communication unit 21 transmits pulsed light to the optical fiber 10-2. Furthermore, the communication unit 21 receives backscattered light generated as the pulsed light is transmitted through the optical fiber 10-2 as an optical signal from the optical fiber 10-2.
  • the communication unit 21 While the communication unit 21 is performing the above-described operation, the user on the patch panel 30 side sequentially applies pressure to the plurality of optical fibers 10 one by one. Then, each time compression is applied, the determination unit 22 determines whether or not artificial vibrations due to compression have occurred in the connected optical fiber 10-2. Specifically, this determination is made based on a vibration pattern included in the optical signal received by the communication unit 21 and indicating artificial vibration due to compression.
  • the determination unit 22 determines that artificial vibrations due to the pressure occur in the connected optical fiber 10-2. It is determined that the Therefore, the user on the patch panel 30 side can determine that the optical fiber 10-2 that was under pressure at that time is to be removed.
  • the optical fiber 10 to be removed is the optical fiber 10-2.
  • the communication unit 21 is connected to the optical fiber 10-2 to be removed, and transmits pulsed light to the optical fiber 10-2, as well as from the optical fiber 10-2. Receive optical signals.
  • the communication unit 21 While the communication unit 21 is performing the above-described operation, the user on the patch panel 30 side sequentially applies pressure to the plurality of optical fibers 10, two at a time. Then, each time compression is applied, the determination unit 22 determines whether or not artificial vibrations due to compression have occurred in the connected optical fiber 10-2.
  • the determination unit 22 determines that the pressure is applied to the connected optical fibers 10-2. It is determined that artificial vibration has occurred. Therefore, although the user on the patch panel 30 side can determine that one of the two optical fibers 10-1 and 10-2 that was under pressure at that time is to be removed, it is difficult to identify the optical fiber 10 to be removed. I can't do it until now.
  • the user on the patch panel 30 side performs a second compression, targeting only the two optical fibers 10-1 and 10-2.
  • the user on the patch panel 30 side sequentially applies pressure to the two optical fibers 10-1 and 10-2, one at a time.
  • the determination unit 22 determines that artificial vibrations due to the pressure occur in the connected optical fiber 10-2. It is determined that the Therefore, the user on the patch panel 30 side can determine that the optical fiber 10-2 that was under pressure at that time is to be removed.
  • the user on the patch panel 30 side is applying pressure to one or two optical fibers 10, but the number of optical fibers 10 that are simultaneously applying pressure is one or two.
  • the number is not limited to three, and three or more may be used. That is, the number of optical fibers 10 that apply compression at the same time may be a predetermined number.
  • the number of optical fibers 10 to be removed may be gradually narrowed down, as in the example of FIG.
  • FIG. 5 an example of a schematic operation flow of the sensing device 20 according to the first embodiment will be described. Note that in FIG. 5, when it is determined that artificial vibrations due to compression have occurred in the connected optical fiber 10, the determination operation is terminated at that point. Furthermore, in the determination operation, the user on the patch panel 30 side applies pressure to the plurality of optical fibers 10 one by one in order, as shown in FIG.
  • one optical fiber 10 to be removed is connected to the communication unit 21 (step S11).
  • the communication unit 21 transmits pulsed light to the connected optical fiber 10 (step S12), and receives backscattered light in response to the pulsed light as an optical signal from the connected optical fiber 10 (step S13).
  • the user on the patch panel 30 side sequentially applies pressure to the plurality of optical fibers 10 one by one.
  • the determination unit 22 detects artificial vibrations caused by compression using the connected optical fiber 10, based on a vibration pattern indicating artificial vibrations caused by compression, which is included in the optical signal received by the communication unit 21. It is determined whether or not a vibration has occurred (step S14).
  • step S14 is repeatedly performed until the determination unit 22 determines that artificial vibrations due to compression have occurred in the connected optical fiber 10, and when it is determined that the vibrations have occurred (step S14 (Yes), the operation of FIG. 5 ends.
  • the operation shown in FIG. 5 may be performed one by one in order for the plurality of optical fibers 10 to be removed.
  • the communication unit 21 transmits pulsed light to the connected optical fiber 10 to which one of the plurality of optical fibers 10 is to be removed. , receives backscattered light from the pulsed light as an optical signal from the connected optical fiber 10.
  • the determination unit 22 determines whether or not artificial vibration has occurred in the connected optical fiber 10, based on a vibration pattern indicating artificial vibration due to compression, which is included in the optical signal received by the communication unit 21. Determine.
  • the determining unit 22 determines that artificial vibrations due to compression have occurred in the connected optical fiber 10
  • the user on the patch panel 30 side can confirm that the optical fiber 10 that was being compressed at that time is It can be correctly determined that the item is subject to removal.
  • the first embodiment it is possible to suppress erroneous removal of the optical fiber 10 and erroneously disconnect communication during operation using a simpler method. Further, since the user on the patch panel 30 side can correctly determine which optical fiber 10 is to be removed, the user can quickly perform the removal work of the optical fiber 10.
  • the sensing system according to the second embodiment differs from the configuration of the first embodiment shown in FIG. 1 described above in that a coupler 40 is added.
  • Coupler 40 is placed between sensing device 20 and patch panel 30. Two or more optical fibers 10 among the plurality of optical fibers 10 can be connected to the communication unit 21 of the sensing device 20 via the coupler 40 .
  • two or more optical fibers 10 to be removed can be connected to the communication unit 21 via the coupler 40.
  • two optical fibers 10-2 and 10-7 are connected to the communication section 21.
  • the communication unit 21 transmits pulsed light to the optical fiber 10-2, receives an optical signal from the optical fiber 10-2, and transmits the pulsed light to the optical fiber 10-7. At the same time, an optical signal is received from the optical fiber 10-7.
  • the determination unit 22 determines whether the optical fibers 10-2, 10-7 are connected based on the vibration pattern indicating artificial vibration due to compression, which is included in the optical signal received from each of the optical fibers 10-2, 10-7 by the communication unit 21. 10-7, it is determined whether or not artificial vibration has occurred.
  • the determination unit 22 determines that artificial vibrations due to compression have occurred in the optical fiber 10-2
  • the user on the patch panel 30 side can It can be determined that the fiber 10-2 is to be removed.
  • the determination unit 22 determines that artificial vibrations due to compression have occurred in the optical fiber 10-7
  • the user on the patch panel 30 side can remove the optical fiber 10-7 that was being compressed at that time. It can be determined that 7 is subject to removal. Therefore, a detailed explanation of the operation of the sensing device 20 according to the second embodiment will be omitted.
  • the communication unit 21 connects two or more optical fibers 10 to be removed via the coupler 40, and connects each of the two or more connected optical fibers 10.
  • a pulsed light is transmitted to the optical fiber 10, and backscattered light corresponding to the pulsed light is received as an optical signal from each of the two or more connected optical fibers 10.
  • the determination unit 22 determines whether the two or more connected optical fibers It is determined whether or not artificial vibration has occurred in each of the fibers 10.
  • the determination of the optical fiber 10 to be removed on the side of the patch panel 30 was manually performed by the user based on the determination result of the determination unit 22.
  • the determination of the optical fiber 10 to be removed on the patch panel 30 side is performed on the sensing device 20 (determination unit 22) side.
  • the sensing system according to the third embodiment has the following points: a reporting section 23 is added to the sensing device 20, compared to the configuration of the first embodiment shown in FIG. The difference is that the function of the determination unit 22 is expanded.
  • the determining unit 22 determines that artificial vibrations due to compression have occurred in a specific optical fiber 10 of the optical fibers 10 to be removed connected to the communication unit 21, the specific optical fiber 10 and It is determined that the optical fiber 10 applying pressure on the patch panel 30 side is the same.
  • the notification unit 23 When the determination unit 22 determines that the specific optical fiber 10 and the optical fiber 10 applying pressure on the patch panel 30 side are the same, the notification unit 23 notifies a predetermined notification destination of this fact. to be notified.
  • the notification unit 23 displays a GUI (Graphical User Interface) screen indicating that the specific optical fiber 10 and the optical fiber 10 applying pressure on the patch panel 30 side are the same, to a predetermined notification destination. displayed on a display device such as a display or monitor.
  • the display device of the predetermined notification destination is, for example, a display device on the patch panel 30 side.
  • FIG. 8 shows an example of a GUI screen.
  • steps S21 to S24 similar to steps S11 to S14 in FIG. 5 of the first embodiment described above are performed.
  • step S24 if the determination unit 22 determines that artificial vibration due to compression has occurred in a specific optical fiber 10 among the optical fibers 10 to be removed connected to the communication unit 21 (Yes in step S24) ), further, it is determined that the specific optical fiber 10 and the optical fiber 10 applying pressure on the patch panel 30 side are the same (step S25).
  • the notification unit 23 notifies a predetermined notification destination that the specific optical fiber 10 and the optical fiber 10 applying pressure on the patch panel 30 side are the same (step S26).
  • This notification may be performed, for example, by displaying a GUI screen as shown in FIG. 8 on a display device of a predetermined notification destination.
  • the determination unit 22 determines that artificial vibrations due to compression have occurred in a specific optical fiber 10 among the optical fibers 10 to be removed that are connected to the communication unit 21. If it is determined that the specific optical fiber 10 and the optical fiber 10 applying pressure on the patch panel 30 side are the same, the notification unit 23 sends a predetermined notification to that effect. Notify first. Thereby, for example, the user on the patch panel 30 side can be informed that the optical fiber 10 to be removed and the optical fiber 10 applying pressure on the patch panel 30 side are the same. Other effects are similar to those of the first embodiment described above.
  • the communication section 21 and the determination section 22 are provided inside the sensing device 20, but the present invention is not limited thereto.
  • the determination unit 22 may be provided in a separate device different from the sensing device 20, or may be provided on the cloud.
  • FIG. 10 shows a configuration example of a sensing system in which a determination unit 22 is provided outside the sensing device 20. Note that in the sensing system shown in FIG. 10, the notification section 23 may be provided inside or outside the sensing device 20, as in the third embodiment described above.
  • the computer 50 includes a processor 51, a memory 52, a storage 53, an input/output interface (input/output I/F) 54, a communication interface (communication I/F) 55, and the like.
  • the processor 51, memory 52, storage 53, input/output interface 54, and communication interface 55 are connected by a data transmission path for mutually transmitting and receiving data.
  • the processor 51 is an arithmetic processing device such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit).
  • the memory 52 is, for example, a RAM (Random Access Memory) or a ROM (Read Only Memory).
  • the storage 53 is, for example, a storage device such as an HDD (Hard Disk Drive), an SSD (Solid State Drive), or a memory card. Further, the storage 53 may be a memory such as RAM or ROM.
  • Programs are stored in the storage 53.
  • This program includes a set of instructions (or software code) that, when loaded into a computer, causes the computer 50 to perform one or more functions in the sensing device 20 described above.
  • the components in the sensing device 20 described above may be realized by the processor 51 reading and executing a program stored in the storage 53. Further, the storage function in the sensing device 20 described above may be realized by the memory 52 or the storage 53.
  • the above-mentioned program may be stored in a non-transitory computer-readable medium or a tangible storage medium.
  • computer-readable or tangible storage media may include RAM, ROM, flash memory, SSD or other memory technology, Compact Disc (CD)-ROM, Digital Versatile Disc (DVD), Blu-ray ( trademark) disk or other optical disk storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage device.
  • the program may be transmitted on a transitory computer-readable medium or a communication medium.
  • transitory computer-readable or communication media includes electrical, optical, acoustic, or other forms of propagating signals.
  • the input/output interface 54 is connected to a display device 541, an input device 542, a sound output device 543, and the like.
  • the display device 541 is a device that displays a screen corresponding to the drawing data processed by the processor 51, such as an LCD (Liquid Crystal Display), a CRT (Cathode Ray Tube) display, or a monitor.
  • the input device 542 is a device that receives operation input from an operator, and is, for example, a keyboard, a mouse, a touch sensor, or the like.
  • the display device 541 and the input device 542 may be integrated and realized as a touch panel.
  • the sound output device 543 is a device, such as a speaker, that outputs sound corresponding to the audio data processed by the processor 51.
  • the communication interface 55 transmits and receives data to and from an external device.
  • the communication interface 55 communicates with an external device via a wired communication path or a wireless communication path.
  • a communication unit to which at least one optical fiber of the plurality of optical fibers is connected, and transmits pulsed light to the connected at least one optical fiber and receives an optical signal from the at least one optical fiber. and, a determination unit that determines whether or not the predetermined vibration has occurred in the at least one optical fiber, based on a vibration pattern indicating the predetermined vibration included in the optical signal received from the at least one optical fiber; , Sensing equipment equipped with.
  • the predetermined vibrations are artificial vibrations that are artificially generated in order by a predetermined number of vibrations on the plurality of optical fibers at the connecting device side.
  • Sensing equipment described in Appendix 6. Appendix 8)
  • the determination unit determines that the predetermined vibration has occurred in a specific optical fiber of the at least one optical fiber, the determination unit generates the artificial vibration in the specific optical fiber and the connected device. determine that the optical fiber is the same as the optical fiber Sensing equipment described in Appendix 7.
  • a sensing method using a sensing device At least one optical fiber among the plurality of optical fibers is connected to the sensing device, The sensing method includes: a communication step of transmitting pulsed light to the at least one connected optical fiber and receiving an optical signal from the at least one optical fiber; a determination step of determining whether or not the predetermined vibration has occurred in the at least one optical fiber, based on a vibration pattern indicating the predetermined vibration included in the optical signal received from the at least one optical fiber; , sensing methods, including; (Appendix 12) One end of the plurality of optical fibers is connected to a connecting device, The other end of the at least one optical fiber of the plurality of optical fibers is connected to the sensing device, The predetermined vibrations are artificial vibrations that are artificially generated in order by a predetermined number of vibrations on the plurality of optical fibers at the connecting device side.
  • the sensing method described in Appendix 11. (Appendix 13) In the determination step, if it is determined that the predetermined vibration has occurred in a specific optical fiber of the at least one optical fiber, the artificial vibration is generated in the specific optical fiber and the connected device. determine that the optical fiber is the same as the optical fiber The sensing method described in Appendix 12. (Appendix 14) If it is determined in the determination step that the specific optical fiber and the optical fiber that generated the artificial vibration on the connected device side are the same, a notification is made to notify a predetermined notification destination to that effect. further including steps, The sensing method described in Appendix 13.

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  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Optical Transform (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
PCT/JP2022/018682 2022-04-25 2022-04-25 センシングシステム、センシング機器、及びセンシング方法 Ceased WO2023209758A1 (ja)

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WATANABE ICHIRO, SEIJI TAKASHIMA, HIROTO SAITO, HIDEO KOBAYASHI: "Design and Characteristics of Core Wire Comparison Device Using Communication Light External Modulation Method", IEICE TRANSACTIONS ON COMMUNICATIONS), NON-OFFICIAL TRANSLATION, vol. J75-B-I, no. 1, 25 January 1992 (1992-01-25), pages 75 - 84, XP093105266 *

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