Showing papers on "Sleep (system call) published in 1999"

Timing the end of nocturnal sleep.

Abstract: Some people can quite accurately time the end of their night's sleep at will, without using an alarm clock1, demonstrating that it is possible to voluntarily control a state of consciousness that is characterized by a loss of volition and attentional guidance2. Here we show that the expectation that sleep will come to an end at a certain time induces a marked increase in the concentration of the hormone adrenocorticotropin in the blood one hour before waking. The regulation of adrenocorticotropin release during nocturnal sleep is therefore not confined to daily rhythms; it also reflects a preparatory process in anticipation of the end of sleep.

Method and apparatus for compensating for frequency drift in a low frequency sleep clock within a mobile station operating in a slotted paging mode

Abstract: A method and apparatus is described for tracking the length of a sleep period within a mobile station using a sleep clock to precisely calibrate portions of the sleep period. The sleep period subdivided into a sequence of sub-periods each of known duration wherein the durations of the sub-periods are not necessarily integer multiples of cycles of the sleep clock. Elapsed time is tracked within each individual sub-period of the sleep period using an integer sleep counter which tracks whole cycles of the sleep clock. Then any remaining fractional portions of the cycles of the sleep mode clock not accounted for by the integer sleep counter are tracked using a fractional sleep counter. The fractional sleep counter accumulates remaining fractional portions of sleep mode cycles from one sub-period to the next. A method and apparatus is also described for estimating frequency drift with a sleep clock signal used during a slotted paging mode of operation of a wireless mobile station. An initial frequency of the sleep clock signal is determined following power-up of the mobile station. A fixed frequency drift compensation factor representative of a difference between the initial frequency of the sleep clock signal and a predetermined nominal frequency is then determined. A dynamic frequency error compensation factor representative of a difference between the initial frequency and a current frequency of the slow clock signal is estimated. Then, throughout the slotted mode of operation, new values for the dynamic frequency compensation factor are iteratively determined by using a loop filter.

Watchdog timer that is disabled upon receiving sleep status signal from monitored device wherein monitored device is not responsive to time-out of watchdog timer

Abstract: A system comprises a first device and a second device. The first device operates in a power management environment and has a sleep status signal for indicating a sleep status to the second device. The sleep status indicates if the first device is in a sleep state or normal operation state. The second device is coupled to the first device and checks for malfunctions of the first device. The second device only checks for malfunctions of the first device if the first device is in the normal operation state.

Controlling power for a sleeping state of a computer to prevent overloading of the stand-by power rails by selectively asserting a control signal

Abstract: A computer receives a sleep signal that instructs the computer to enter a sleeping state in which stand-by power from a power source is needed. The computer generates a control signal that initiates delivery of stand-by power from the power source in connection with the computer's entering the sleeping state. The control signal is asserted in at least one situation in which the sleep signal is asserted, and the control signal is not asserted in at least one other situation.

Method and apparatus for an ACPI compliant keyboard sleep key

Abstract: A computer system includes a status register for receiving events which cause the computer system to change to a low power mode or back to a normal power mode. The status register is selectively coupled to a keyboard controller to receive an interrupt from the keyboard controller when a sleep/wake key is actuated on a keyboard. When the computer system is normally powered, the keyboard interrupt is not routed to the status register. If the computer system is powered down, the keyboard interrupt is routed so that actuation of the sleep/wake key will awake the computer system.

Sequential logic circuit with active and sleep modes

Abstract: A sequential logic circuit having active and sleep modes prevents stored information from being lost immediately after the transition from a sleep mode to an active mode. This sequential logic circuit includes a latch circuit having an input terminal to which an input signal is applied, an output terminal from which and output signal is derived, and a set and/or reset terminal to which a set and/or reset signal is applied. The latch circuit has an active mode where a latch function is operable and a sleep mode where the latch function is inoperable, one of which is alternatively selected. The output signal is set or reset to have a specific logic state by the set or reset signal having a specific logic level applied to the set or reset terminal in the active mode. The sequential logic circuit further includes circuitry for preventing the set or reset signal from being applied to the set or reset terminal in the sleep mode, thereby avoiding loss of information or data latched in the latch circuit prior to transition to the sleep mode from the active mode. Thus, the information-latch operation in both of the modes is ensured.

Low power supervisor controller

Abstract: A low power supervisor controller for an electric vehicle substantially reduces ignition-off draw current in the main control module. The supervisor controller has a sleep controller for powering down the main control module when an interrupt event has not occurred. The sleep controller powers up the main control module when the interrupt event has occurred. The supervisor controller also has an interrupt monitor for determining when the interrupt event occurs, as well as a supervisor wait module. The supervisor wait module establishes and controls an interrupt cycle, wherein the interrupt cycle is defined by an amount of time between determinations of the interrupt monitor.

Placing a computer system into a sleeping state

Abstract: A computer system enters or exits a sleeping state, such as the ACPI “S 1 ” state, in response to a sleep or wake event. Upon detecting the sleep or wake event, a system component generates a sleep or wake signal that instructs the computer to enter or exit the sleeping state. This sleep or wake signal is of a type to which the computer's processor does not respond. Therefore, a PMI signal is asserted in response to the sleep or wake signal. The PMI signal, when asserted, causes the processor to halt program execution.

Sleep mode indicator for a battery-operated device

Abstract: A new and useful sleep mode indicator system for laptop computers provides efficient use of battery power. In sleep mode, this indicator system turns OFF the typical blinking LED during the user-specified periods of unavailability. For example, a computer in sleep does not need to use electricity to identify its sleep mode status while its user is also asleep or is otherwise unavailable. This indicator system collects periods of unavailability and turns OFF the blinking LED during those periods. Also, sometimes the user may intend to operate the computer during a previously specified period of unavailability. This is reflected by the computer not in sleep mode at the start of the period and later enters temporarily into the sleep mode inside that specified period. Assuming that being the case, the present invention skips the period of unavailability just for that day. Further, the indicator system is not turned OFF any more for the rest of the specified period for that particular day.

Sleep stage determinig method and sleep stage determining device

Abstract: PROBLEM TO BE SOLVED: To measure the sleep stage of a subject in on-invasive state by extraction a palmus signal and a breath signal from output signals of a living body signal detecting means disposed under the body of the subject, and discriminating a non-REM sleep and as REM sleep from at least one variation pattern between a palmus signal waveform and a breath signal waveform. SOLUTION: In a bed 7 where a subject lies, an air mat is disposed in a position to which the body of a tested person is applied, and a micro-differential pressure sensor 13 and an absolute pressure sensor 2 are installed through an air tube 12 connected to one end of the air mat 11 to constitute a living body signal detecting means 1 for detecting a living body signal of the subject. A signal extract means 4 of a sleep stage determination control device 3 is adapted to extract a signal by application of a suitable filter and a data processing means, and a sleep stage determining means 5 determines the sleep stage from a palmus signal and a breath signal extracted by the signal extract means 4. The determination result of the sleep stage is continuously recorded.

Graphic Sleep Monitoring: A Clinical Program To Improve Sleep in Residents with Mental Retardation

Abstract: Sleep problems in persons who are mentally retarded may reflect environmental disruptions, institutional practices, psychiatric disorders, and/or organic pathology. A graphic sleep monitoring system was implemented for 471 residents of a state institution over 1 year. The initiation of the campus-wide data collection system was preceded by a 1-hr training of nonprofessional staff in recording and charting methods. After a 90-day start-up phase, psychology staff in each living unit provided the nonprofessional staff additional support with data collection and environmental adaptations as needed. Also, the psychiatrists began to include review of the sleep data in monthly follow-ups of established cases and as part of diagnostic formulation in new cases. This intervention resulted in a statistically significant improvement in the overall sleep efficiency index (SEI) of about 30 min. The higher the SEI, the more efficient the sleep cycle (i.e., the less fragmentation due to interruptions and the shorter the sleep latency). The number of residents with fragmented sleep was reduced at 1 year and residents spent less time in bed awake. Variables, such as retardation level, age, gender, behavioral risk status, and inter-cottage moves, were not significantly related to sleep. Significant effects were found as a function of type of maladaptive behavior. Self-abusive residents had lower SEI scores than residents who were aggressive or destroyed property. Results suggest that a relatively simple graphic sleep data collection and monitoring system that allowed quick visual analysis was helpful in making environmental and treatment modifications that resulted in improved sleep for persons who are mentally retarded and unable to express their needs directly.

Computer system and power saving method for computer system

Abstract: PROBLEM TO BE SOLVED: To provide a system for selectively turning OFF the power of various sub-systems inside a computer system based on the state of a user controlled house appliance function. SOLUTION: This system is provided with; a power switch for removing the power from all the plural sub-systems; a sleep button accessible by a user for generating sleep signals for displaying that a sleep mode is turned to an active state; and a power management function for judging whether or not the house appliance function is in the active state in response to the sleep signals, for turning all the plural sub-systems, excluding the one required for operating the house appliance function, to a power saving mode when the house appliance function is in the active state, and for turning an additional sub-system normally required for operating the house appliance function to the power saving mode further when the house appliance function is not in the active state.

Suspending and resuming method providing system processing function

Abstract: PROBLEM TO BE SOLVED: To obtain a method which provides the system processing function making it possible to suspend and resume program states and displays a list of the program states so that a user can easily select a task to be resumed. SOLUTION: This method is performed in a configuration where a sleep button 1, an input/output device 2 such as a keyboard and a display device, a data processor 3 which is equipped with a power management signal detecting means 31, a depressed key decision and storage area selecting means 32, a saving and loading means 33, and a counter means 34 and operates under program control, and a storage device 5 which has a look-up table 52 storing hardware state data 4 showing the operation state of the computer, a key code, a date and time, a task name, a storage area, a resuming frequency, etc., and N storage areas 521 to 52N storing the hardware states, are provided.

Sleep inducer and method for controlling of it

Abstract: The present invention is to generate, regularly natural sound and / or the EEG for the surface of the water leads to the correct time preset using a digital timer related to a sleep guidance system and a control method that can induce and promote the human sleep intended. The apparatus and method are induced sleep can be provided with a plurality of means for generating the sounds of various nature, and by the user and periodically generated by randomly selecting a desired signal, to more effectively relax the human brain promote sleep device; A plurality of means for generating the sounds of various nature by using a digital timer, by controlling to generate the sound of a suitable nature to advance periodically sleep induction at a given time, to more effectively relax the human brain to promote sleep and a control method that can be characterized. Thus, as the user listens to the sound of any desired nature, to effectively relax the brain it is able to promote human sleep.

Evaluation of Sleep Discipline in Sustaining Unit Performance

Abstract: : This study was undertaken to develop a computer simulation algorithm for sleep, to integrate that algorithm into a mission effectiveness model of unit operations, and to test the relationship between different profiles of sleep discipline in terms of unit effectiveness. A sleep reservoir model was adopted and tailored from the methodology used within the Army Unit Resiliency Analysis (AURA) model developed by the U.S. Army Ballistic Research Laboratory (BRL). Seven and 8 hours of sleep provide sustained performance levels for long term operations. Six hours of sleep provides high performance for long periods, but is subject to degradation in the level of performance that increases over time. Five hours of sleep provides the sleep required for operation during a few days and minimal performance for a short burst of activity.

Refresh circuit and control circuit of optical disk reproducing device using the same

Abstract: PROBLEM TO BE SOLVED: To reduce power consumption while maintaining contents of buffer RAM by halting oscillation while generating a halt signal, generating a sleep time clock of a period required for dynamic RAM in a sleep mode, and generating a refresh signal for the dynamic RAM. SOLUTION: When an external sleep command is inputted to a NAND gate 31 via a halt signal creating circuit 27, the oscillation of a crystal oscillator 21 is halted. A frequency conversion circuit 33 operates only while a halt signal is being inputted, and outputs a frequency-conversion output of the lowest frequency of a PLL circuit 32. Moreover, the frequency conversion circuit 33 converts the lowest frequency of the PLL circuit 32 into a sleep time clock of a frequency required for buffer RAM. Thus, when the sleep command is inputted, the crystal oscillator 21 is made to stop oscillating, and a sleep time clock is generated by using self-oscillation of the PLL circuit 32, to refresh DRAM 26.

Mapping interrupt handler routine between memories when switching between operational modes

Abstract: A computer system (1, fig. 1) is operable in two modes of operation, for example "normal" and "sleep" modes and includes a CPU (5, fig. 1) operably coupled to first, e.g. FLASH, and second, e.g. DRAM, memory devices (6, 7, fig. 1). During initialisation, the interrupt handler routine is stored in both memories, 102, 104. During the "normal" mode of operation, and when an interrupt for switching into "sleep" mode occurs, 106, the interrupt handler routine is run from the second memory but causes the address for pointing to the interrupt handler routine to be mapped to the first memory, 108. The system is then switched to "sleep" mode, 110. When an interrupt for "wake up" arrives, 112, the interrupt handler is operated from the first memory but is re-mapped to the second memory, 114 prior to switching back to the "normal" mode, 116. Mapping the interrupt routine between the two memories obviates the need for accessing, and possibly damaging, the routine in DRAM when it is in the self-refresh (low power) mode.

Device for determining depth of sleep

Abstract: The invention relates to a device for determining the depth of sleep of a human being, comprising a transformation device for transforming an EEG signal into the frequency range and a processing device which uses at least two of three frequency ranges for determining a depth of sleep index SF.