• Proceedings of the Korean Operations and Management Science Society Conference
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• 2007.11a
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• pp.195-203
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• 2007

In this paper, an analytic model of sleep model operation in the IEEE 802.16e is investigated. A mobile subscribe. station (MSS) goes to sleep mode after negotiations with the base station (BS) and wakes up periodically for a short interval to check whether there is downlink traffic to it. If the arrival of traffic is notified, an MSS returns to wake mode. Otherwise, it again enters increased sleep interval which is double as the previous one. In order to consider the situation more practically, we propose the sleep mode starting threshold, during which MSS should await packets before it enters the sleep mode. By modifying the M/G/1 with multiple vacations model, energy consumption ratio(ECR) and average packet response time are calculated. Our analytic model provides potential guidance in determining the optimal parameters values such as sleep mode starting threshold, minimal sleep and maximal sleep window.

• Sleep Medicine and Psychophysiology
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• v.1 no.1
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• pp.9-19
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• 1994

Disorders of intitating and maintaining sleep(DIMS : insomnia) may be a symptom of some other disease or the basic, root problem in some patients. DIMS is usually treated by private physicians or psychiatrists, initially. Many physicians can do to improve the quality of life of the sleep disordered patients by appropriate evaluation and management For the effective management of DIMS patients, the accurate differential diagnosis is essential. In polysomnographic evaluation for insomnia, the physician should consider the aspects of cost-effectiveness to provide the maximal benefits for the patients. For the purpose of this, evaluation of DIMS complaints outside the sleep disorder clinic, indication for referral to a sleep disorder clinic, the role of polysomnopraphy in evaluating DIMS, and polysomnographic findings of different types of DIMS are discussed, together with possible way to diagnose them.

• Sleep Medicine and Psychophysiology
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• v.7 no.2
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• pp.79-83
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• 2000

Sleep disturbances are frequently associated with neurological disorders. Sleep disorders interfere with rehabilitation of patients with neurological disorders such as stroke and may increase the severity of their symptoms and recurrence rate of stroke. The treatment of sleep apnea syndrome is particularly important in managing patients with cerebral infarction of whom 50-80% have moderate to severe sleep apnea. Sleep apnea produces not only poor quality sleep but also excessive daytime sleepiness, fatigue and lack of energy. Sleep problems frequently found in patients with dementia are sleep-wake cycle abnormality, fragmentation of sleep, nocturnal insomnia, decreased slow wave sleep and REM sleep, and sleep disordered breathing. The management of sleep disturbances is very important for controlling symptoms such as nocturnal wandering and sundowning syndrome in patients with dementia. Parkinson's disease and epilepsy are other neurological disorders that may have sleep disturbances.

• Sleep Medicine and Psychophysiology
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• v.3 no.2
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• pp.90-96
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• 1996

• The Korean Journal of Health Service Management
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• v.12 no.4
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• pp.219-228
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• 2018

Objectives : This study was conducted to examine the relationships between Korean adult's daily hours of sleep, depression, and suicidal thoughts using data from the 7th National Health and Nutrition Survey. Methods : This study utilized a depression screening tool, the 9-item Patient Health Questionnaire (PHQ-9), for the 6,355 participants of the health and mental health survey. T-tests, cross analysis, correlation analysis, and logistic regression analysis were used. Results : The results showed that sufficient hours of sleep decreased depression. The depression score for females (3.19) was significantly higher than for males (2.10; p<.001). The participants in the depression group slept less than 7 hours per day (p<.01). Conclusions : The study results showed a significant correlation between sleep duration and depression when health-related factors and social factors influencing sleep were controlled. The results also indicated that this correlation may vary based on gender. This study implies that further studies are necessary to identify the causal relationship between sleep duration and depression.

• The Journal of the Convergence on Culture Technology
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• v.9 no.1
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• pp.443-448
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• 2023

Over the past five years, the number of patients with sleep disorders has increased by about 250,000 from 840,000 in 2017 to 1.09 million in 2021. In addition, sleep disorder is a factor that causes dementia risk factors, and furthermore, the population with sleep disorder is a very important policy issue in terms of stable health insurance financial management in the future in terms of national health management in the super-aging trend. Therefore, this study aims to establish an efficient treatment environment in medical institutions responsible for the current status of polysomnography and effective reimbursement policies for the recently increasing population with sleep disorders, and appropriate sleep management policies for future sleep disorders through correct implementation. We are trying to find out the actual condition and improvement plan through interviews with related organizations and experts.

• Journal of the Korean Operations Research and Management Science Society
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• v.32 no.4
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• pp.89-99
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• 2007

In this paper, an analytic model of a sleep mode operation in the IEEE 802.16e is investigated. A mobile subscriber station(MSS) goes to sleep mode after negotiations with the base station(BS) and wakes up periodically for a short interval to check whether there is downlink traffic to it. If the arrival of traffic is notified, an MSS returns to wake mode. Otherwise, it again enters increased sleep interval which is double as the previous one. In order to consider the situation more practically, we propose the sleep mode starting threshold, during which MSS should await packets before it enters the sleep mode. By modifying the M/G/l with multiple vacations model, energy consumption ratio(ECR) and average packet response time are calculated. Our analytic model provides potential guidance in determining the optimal parameters values such as sleep mode starting threshold, minimal sleep and maximal sleep window.

• Journal of Dental Anesthesia and Pain Medicine
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• v.23 no.4
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• pp.179-192
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• 2023

Obstructive sleep apnea (OSA) is a common sleep-breathing disorder associated with significant comorbidities and perioperative complications. This narrative review is aimed at comprehensively overviewing preoperative risk evaluation and perioperative management strategies for patients with OSA. OSA is characterized by recurrent episodes of upper airway obstruction during sleep leading to hypoxemia and arousal. Anatomical features, such as upper airway narrowing and obesity, contribute to the development of OSA. OSA can be diagnosed based on polysomnography findings, and positive airway pressure therapy is the mainstay of treatment. However, alternative therapies, such as oral appliances or upper airway surgery, can be considered for patients with intolerance. Patients with OSA face perioperative challenges due to difficult airway management, comorbidities, and effects of sedatives and analgesics. Anatomical changes, reduced upper airway muscle tone, and obesity increase the risks of airway obstruction, and difficulties in intubation and mask ventilation. OSA-related comorbidities, such as cardiovascular and respiratory disorders, further increase perioperative risks. Sedatives and opioids can exacerbate respiratory depression and compromise airway patency. Therefore, careful consideration of alternative pain management options is necessary. Although the association between OSA and postoperative mortality remains controversial, concerns exist regarding adverse outcomes in patients with OSA. Understanding the pathophysiology of OSA, implementing appropriate preoperative evaluations, and tailoring perioperative management strategies are vital to ensure patient safety and optimize surgical outcomes.

• Journal of the Institute of Convergence Signal Processing
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• v.20 no.4
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• pp.212-217
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• 2019

In this paper, a sleep management pillow system for snoring detection and respiration measurement is investigated. The sleep management pillow system consists of four force sensing resistor(FSR) sensors, two microphones(MIC), a pillow, a measurement system. Four FSR sensors attached at the bottom part of the pillow are used for respiration measurement and snoring detection. Two microphones located at the middle left and right of the pillow are utilized for only snoring detection. The respiration and the snoring of ten young people were measured using the sleep management pillow system composed of a data acquisition board, interface circuit, and personal computer. The measurement accuracy of the respiration was about 98% and the measurement accuracy of the snoring was about 97%. The experiment results show that the sleep management pillow system can be used for snoring detection and respiration rate measurement during sleeping.

• Sleep Medicine and Psychophysiology
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• v.5 no.1
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• pp.18-33
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• 1998

Sleep and Epilepsy either represent the opposite and independent spectrum of episodic manifestations from brain or closely interact with each other. Sleep or sleep deprivation may provoke epileptic seizures or activate epileptiform discharges in epilepsy patients whereas epilepsy may alter the sleep structure. Sleep stages are also known to influence pathophysiology of seizures in terms of ictogenesis. In this review, the impact of sleep on epilepsy as well as that of epilepsy on sleep are presented. Additionally the interaction between sleep and epilepsy will be discussed. This review will also comment on the differential diagnosis between nocturnal or sleep-related epilepsy and various sleep disorders. Finally, clinical application of the above perspectives of sleep and epilepsy will be suggested for the purpose of a better management of epilepsies.