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Showing papers on "Sleep (system call) published in 1997"


Patent
05 Feb 1997
TL;DR: In this paper, a sleep mode was used to conserve power in a medical diagnostic apparatus by using a sleep state during a monitoring state. But, the sleep state was chosen to be consistent with the period in which an alarm condition would need to be generated if a patient's condition started to quickly change.
Abstract: A method and apparatus for conserving power in a medical diagnostic apparatus by using a sleep mode during a monitoring state. The sleep mode allows not only the processor to be put to sleep, but other detection circuitry as well. This is accomplished by not relying on detecting events to awaken the sleeping circuitry, but rather establishing the stability of a physiological parameter before going to sleep. The invention monitors a physiological parameter of the patient and enters a sleep mode only after it has been stable for a predetermined period of time. The apparatus is periodically awakened from the sleep mode to take additional measurements and to ascertain that the stability of the physiological parameter has not changed. In one embodiment, the sleep period is chosen to be consistent with the period in which an alarm condition would need to be generated if a patient's condition started to quickly change.

223 citations


Patent
James T. L. Kou1
07 Aug 1997
TL;DR: In this article, the authors propose a power saving feature in a computer system such as a desktop computer using the Windows™ operating system, which includes one or more "sleep" buttons which selectively reduce power consumption to subsystems based on the status of various consumer devices which share the subsystems with a computer function of the system.
Abstract: The invention provides a power saving feature in a computer system such as a desktop computer using the Windows™ operating system. The computer system includes one or more "sleep" buttons which selectively reduce power consumption to subsystems based on the status of various consumer devices which share the subsystems with a computer function of the system. From the user's perspective, each sleep button acts as a power switch for the computer but not for devices associated with the computer. Each sleep button transitions the computer from its normal power-on state to one or more power saving states depending on which consumer devices are active.

102 citations


Patent
28 Feb 1997
TL;DR: In this paper, the authors present a low-power sleep mode in which the radiotelephone is synchronized to the received PN roll boundaries from the system before entering into sleep mode.
Abstract: Prior to entry into a low-power sleep mode, a radiotelephone (104) in a radiotelephone system (100) calculates in advance the timing required to wake up selected portions of the radiotelephone and stores the calculated wakeup times in registers (216). Also prior to entry into sleep mode, local timing of the radiotelephone is synchronized to received PN roll boundaries from the radiotelephone system. In the sleep mode, the radiotelephone uses a sleep timer (210) to simulate system timing. When the sleep timer (210) matches the stored wakeup times, the radiotelephone re-activates the selected portions of the radiotelephone, such as an oscillator (116) and a radio frequency portion (109) of an analog front end (108), to exit the sleep mode and reacquire communication with the system. This also permits an early exit from sleep mode, for example to service an interrupt, while maintaining system timing.

64 citations


Journal Article
TL;DR: After operations, personnel need continuous sleep for only 10 to 12 hours as longer sleep increases sleep inertia and delays getting back to normal schedules, and sleep lost need not be replaced hour-for-hour.
Abstract: This review discusses the need for sleep, effects of sleep deprivation on behaviour and performance in the military, and sleep management recommendations to optimise combat effectiveness. Most people, regardless of sex or race, prefer 7 to 8 hours of sleep each night. Sleeping during the day is less recuperative. Continuous sleep is more effective than multiple short naps-even when the total hours for naps is more. Ten to 20 minute naps are useful when continuous sleep is not possible. Sleep inertia is the 5 to 30 minute period of sluggishness after awakening and important military tasks should be avoided. Previously, continuous work episodes (CWEs) duration was restricted by limited night vision, unreliable equipment and reduced endurance of military personnel. With improved technology, CWEs are now restricted primarily by endurance which is affected by sleep deprivation. This was one of the experiences noted in recent conflicts (e.g. Desert Storm) by personnel in the air force, army and navy. Since there will be changes in operational requirements, several work-rest-sleep plans must be prepared. Sleeping the preferred 7 to 8 hours per 24 hours the week before an operation may help prepare for optimal performance. Personnel should be familiarised with conditions under which they may sleep. During combat, sleep management should ideally avoid situations where all personnel are exhausted at the same time. As sleep debt accumulates, a person's mood, motivation, attention, alertness, short-term memory, ability to complete routines, task performance (errors of omission more than errors of commission) and physical performance will become more negatively affected. Counter measures must then be taken (e.g. time for sleep or naps, changing routines or rotating jobs). Drugs like caffeine and amphetamine can help personnel stay awake. However, they may also keep them awake when they need to sleep- and on awakening, they could suffer from "hang-overs" and are less efficient. Sleep lost need not be replaced hour-for-hour. Therefore, after operations, personnel need continuous sleep for only 10 to 12 hours as longer sleep increases sleep inertia and delays getting back to normal schedules.

29 citations


Patent
28 Nov 1997
TL;DR: In this paper, the authors proposed a dynamic transition between sleep states according to variation of the power supply state of a computer to ensure an optimum trade-off between the shortening of the system startup time from the sleep state and the electric power saving in the sleep states.
Abstract: PROBLEM TO BE SOLVED: To obtain dynamic transition between sleep states according to variation of the power supply state of a computer. SOLUTION: If an internal change occurs to an internal battery 17 or external power source 18, that change is detected by a built-in controller 16 and reported to an OS through a power source management event signal POWER- PME and SCI interruption. According to the change in the power supply state of the internal battery 17 or external power source 18, the current system state is switched to another system state. Consequently, dynamic transition between sleep states corresponding to the variation of the power supply state of the computer is obtained to ensure an optimum trade-off between the shortening of the system startup time from the sleep state and the electric power saving in the sleep state.

27 citations


Patent
31 Dec 1997
TL;DR: In this paper, a method and apparatus for detecting drowsiness and awakening the user is presented, where the load on a piezo-ceramic eye blinking detection unit changes upon blinking activity resulting in an electrical output.
Abstract: A method and apparatus for detecting drowsiness and awakening the user. The load on a piezo-ceramic eye blinking detection unit changes upon blinking activity resulting in an electrical output. This electrical output is then processed and compared to a predetermined time interval for blinking. An alarm is sounded if the processed electrical output is less than the predetermined time interval.

12 citations


Patent
28 Jan 1997
TL;DR: In this article, a sleep control circuit is used to set the memory into its low power mode upon detection of the sleep acknowledgement signal emitted by the processor, which is a bus transaction that is detected by the memory controller.
Abstract: An electronic device such as a computer, is provided with a processor (10) responsive to a sleep signal being asserted to emit a sleep acknowledgement signal and enter a low power mode, and a memory (13) which is also settable in a low power mode. The memory is, for example, a DRAM with a self refresh mode. Control of entry of the memory into its low power (or sleep) mode is effected by a sleep control circuit (15). This circuit sets the memory into its low power mode upon detection of the sleep acknowledgement signal emitted by the processor. Preferably, the sleep control circuit (15) forms part of a memory controller, and the sleep acknowledgement signal is a bus transaction, that is detected by the memory controller.

5 citations


Patent
03 Dec 1997
TL;DR: In this paper, a television receiver provides a prominent visual indication that it is about to automatically turn off by displaying and gradually enlarging at least one graphically generated margin of the OSD display.
Abstract: It is desirable that a television receiver provide a prominent visual indication that it is about to automatically turn "off". On-screen display (OSD) circuitry automatically reduces the viewable picture area to a small area before turning off the receiver. Reduction of the viewable area may be performed by displaying and gradually enlarging at least one graphically-generated margin of the OSD display.

5 citations


Patent
15 Aug 1997
TL;DR: In this article, a process 1 informs a monitor process 2 of the sleep time and the monitor process 1 sets the reported sleep time of the process 1 in the process sleep table 3 and the corresponding sleep, swapout, swap-in, and wake-up processes of process 1 are performed in order according to the set sleep time.
Abstract: PROBLEM TO BE SOLVED: To make it possible to speedily set an optimum sleep time and dynamically and suitably vary it by providing a process sleep table. SOLUTION: A process 1 informs a monitor process 2 of the sleep time. The monitor process 2 sets the reported sleep time of the process 1 in the process sleep table 3. Then, corresponding sleep, swap-out, swap-in, and wake-up processes of the process 1 are performed in order according to the set sleep time. At this time, the monitor process 2 dynamically varies the sleep time in the table 3 in response to the information from the process 1. Further, the log before the process 1 or monitor process 2 enters a sleep state, process by process, and the log after waking up are gathered and the monitor process 2 totalizes statistical information on the sleep time by the processes according to the logs to display the sleep and execution states.

5 citations


Patent
06 Jun 1997
TL;DR: In this paper, a disaster prevention monitoring controller is provided with a center monitoring device and the terminal equipments which are connected to the monitoring device via a transmission line and have the CPUs that return the acquired monitoring information to the center monitoring devices with reception of the call signals sent to the CPUs themselves.
Abstract: PROBLEM TO BE SOLVED: To provide a disaster prevention monitoring controller which can extremely reduce the power consumption in a service interruption state. SOLUTION: This controller is provided with a center monitoring device and the terminal equipments which are connected to the monitoring device via a transmission line and have the CPUs that return the acquired monitoring information to the center monitoring device with reception of the call signals sent to the CPUs themselves. The central monitoring device includes a control part which transmits the sleep commands to all terminal equipments to stop the operations of their CPUs and also changes the voltage of the transmission line when a prescribed time passed after transmission of the sleep commands. The CPU of every terminal equipment stops its operation with reception of a sleep command. This stop state is canceled when the voltage change of the transmission line is detected in the stop state.

3 citations


Patent
07 Nov 1997
TL;DR: In this article, a method for controlling operation of a battery powered modem to implement power conservation by adaptive modem sleep is presented, which comprises detecting the presence of a periodic network timing signal and detecting transition of the modem processor to a processing ready condition, wherein received RF signals can be processed.
Abstract: A method is disclosed for controlling operation of a battery powered modem to implement power conservation by adaptive modem sleep. The method comprises detecting the presence of a periodic network timing signal and detecting transition of the modem processor to a processing ready condition, wherein received RF signals can be processed. A processor ready signal is generated in response to detection of the processing ready condition and compared in time to occurrence of the network timing signal. A sleep error signal is generated which represents the interval between occurrence of the network timing signal and the processor ready signal. A modem is then directed into a sleep mode for periods of time sufficient to reduce the sleep error signal to be within a predetermined error budget.

Patent
10 Oct 1997
TL;DR: In this article, the authors present a system consisting of a clock, oscillation detection and reactivation means, which are internal to the system and arranged to form, as soon as the system passes into sleep mode, an autonomous time base, to reactivate this system at the end of a predetermined time interval and, when the system is not in "sleep" mode, to fulfil a different function.
Abstract: The present invention concerns a system 1 supplied by an electric power source, and able to operate in "sleep" mode, this system including a system clock 12, oscillation detection means 13 for monitoring the activity of the system clock, and means 16 for reactivating the system when the latter is in "sleep" mode. This system is characterised in that the reactivating means are internal to the system, and in that they are arranged to form, as soon as the system passes into "sleep" mode, an autonomous time base, to reactivate this system at the end of a predetermined time interval and, when the system is not in "sleep" mode, to fulfil a different function to that of time base and reactivation. An advantage of the reactivating means of such a system lies in the fact that they can operate only with a current of the order of 1 nA.

Patent
23 Apr 1997
TL;DR: In this paper, a clock supplying device whose power consumption is small during sleep is proposed. But it is not shown how to provide a clock-supplying device with low power consumption during sleep.
Abstract: PROBLEM TO BE SOLVED: To provide a clock supplying device whose power consumption is small during sleep. SOLUTION: This device consists of an original oscillation slow clock generating means 101 which outputs an original oscillation slow clock 106, a frequency multiplication dividing means 102 which performs multiplication division of the clock 106 and outputs a signal processing fast clock 107 as long as a sleep signal 108 is non-active, a sleep time measuring means 103 which measures sleep time the moment the signal 108 becomes active and outputs a sleep end signal 109 when it measures a defined time and a sleep controlling means 104 which controls sleep/non-sleep of a signal processing block 105 with the signal 108 and recognizes the end of a sleep period with the signal 109. COPYRIGHT: (C)1998,JPO




Patent
26 Mar 1997
TL;DR: In this article, the authors proposed a method to prevent involuntarily occurring sleep by causing the tired user to experience a high degree of revitalization in a short amount of time thanks to sleep induced in an autonomously controlled manner and similarly induced waking.
Abstract: When it is impossible to overcome fatigue with the appropriate amount of sleep, an individual's concentration and performance are restricted according to the extent of their fatigue. The object of the novel method and novel device is to prevent involuntarily occurring sleep by causing the tired user to experience a high degree of revitalization in a short amount of time thanks to sleep induced in an autonomously controlled manner and similarly induced waking. In order to overcome fatigue in a controlled manner, the waking time is made dependent on the muscle tone of an extremity, this muscle tone decreasing significantly at a moment which is considered favourable from the physical and mental aspects and is therefore used as a timer for a waking device. The novel method and the novel device are suitable for use in situations in which no time and no suitable place are available for conventional sleep but the extent of fatigue demands sleep.