• 제목/요약/키워드: And Recovery

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하이퍼레저 패브릭 블록체인을 활용한 시스템 복구 기법 (A System Recovery using Hyper-Ledger Fabric BlockChain)

  • 배수환;조선옥;신용태
    • 한국정보전자통신기술학회논문지
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    • 제12권2호
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    • pp.155-161
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    • 2019
  • 오늘날 수많은 기업과 기관들은 인터넷을 사용한 서비스를 제공하고 있으며, 이를 효율적이고 안정적으로 관리할 수 있도록 정보시스템을 구축하고 운영한다. 정보시스템은 재해 또는 장애로 인해 정상적인 서비스를 제공 할 수 있는 기능을 손실할 가능성을 내포하고 있다. 이에 재해복구시스템을 활용하여 이를 대비하고 있다. 그러나 기존의 재해 복구시스템은 시스템 복구를 위한 파일이 손상되는 경우 정상적으로 복구를 수행할 수 없다. 이에 본 논문에서는 하이퍼레저 패브릭 블록체인을 활용하여 시스템 복구 파일의 무결성을 검증하고 복구를 진행할 수 있는 시스템을 제안한다. 블록생성을 위하여 PBFT 합의 알고리즘을 사용하며, 블록체인 네트워크의 리더 노드에 의해 수행된다. 장애 상황 발생 시 복구 대상의 복구 파일의 해시 값을 블록체인 내의 해시 값과 비교하는 검증 작업을 거쳐 복구 파일의 무결성을 확인하고 복구를 진행한다. 제안 기법의 평가를 위하여 기존의 시스템 복구기법과 데이터 정합성, 데이터 보존 여부, 복구 파일 무결성 검증, 제안 기법 사용 시 트래픽 발생량을 분석하여 실제 적용 가능 여부를 확인하였다.

척수 손상 쥐에 실시한 특정 과제 운동이 운동 행동에 미치는 영향 (Effects of Specific Exercises on Motor Function Recovery In Rats With Experimental Spinal Cord Injury)

  • 전경희
    • 한국전문물리치료학회지
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    • 제18권1호
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    • pp.93-103
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    • 2011
  • This study was implemented to verify the feasibility of motor function recovery and the appropriate period for therapy. The research began with spinal laminectomy of 40 white rats of Sprague-Dawley breed and induced them spinal crush injury. Following results were obtained by using the modified Tarlov test (MTT), Basso, Beattle, Bresnahan locomotor rating scale (EBB scale) and modified inclined plate test (MIPT). First, the measurement using the MTT confirm that the most severe aggravation and degeneration of functions are observed two days after induced injury, and no sign of neuromotor function recovery. Second, better scores were achieved by open-ground movement group on BBB locomotor rating scale test, and weight-bearing on inclined plate group show better performance on MIPT. Third, both BBB and MIPT scale manifested the peak of motor function recovery during 16th day after the injury and turn into gradual recovery gradient during 16th to 24th. Fourth, the control group showed functional recovery, however, the level of recovery was less significant when compared with group open-ground movement group and weight-bearing on inclined plate group. Hence, it was clearly manifested that the lumbar region of the spinal cord had shown the best performance when its functions were measured after the execution of specific physical training; therefore it indicated the possibility of learning specific task even in damaged lumbar regions. Thus it is expected to come out with better and more effective functional recovery if concentrated physical therapy was applied starting 4 days after the injury till 16 days, which is the period of the most active recovery.

Pre-sleep casein protein ingestion: new paradigm in post-exercise recovery nutrition

  • Kim, Jooyoung
    • 운동영양학회지
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    • 제24권2호
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    • pp.6-10
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    • 2020
  • [Purpose] Milk is a commonly ingested post-exercise recovery protein source. Casein protein, found in milk, is characterized by its slow digestion and absorption. Recently, several studies have been conducted with a focus on how pre-sleep casein protein intake could affect post-exercise recovery but our knowledge of the subject remains limited. This review aimed at presenting and discussing how pre-sleep casein protein ingestion affects post-exercise recovery and the details of its potential effector mechanisms. [Methods] We systematically reviewed the topics of 1) casein nutritional characteristics, 2) pre-sleep casein protein effects on post-exercise recovery, and 3) potential effector mechanisms of pre-sleep casein protein on post-exercise recovery, based on the currently available published studies on pre-sleep casein protein ingestion. [Results] Studies have shown that pre-sleep casein protein ingestion (timing: 30 minutes before sleep, amount of casein protein ingested: 40-48 g) could help post-exercise recovery and positively affect acute protein metabolism and exercise performance. In addition, studies have suggested that repeated pre-sleep casein protein ingestion for post-exercise recovery over a long period might also result in chronic effects that optimize intramuscular physiological adaptation (muscle strength and muscle hypertrophy). The potential mechanisms of pre-sleep casein protein ingestion that contribute to these effects include the following: 1) significantly increasing plasma amino acid availability during sleep, thereby increasing protein synthesis, inhibiting protein breakdown, and achieving a positive protein balance; and 2) weakening exercise-induced muscle damage or inflammatory responses, causing reduced muscle soreness. Future studies should focus on completely elucidating these potential mechanisms. [Conclusion] In conclusion, post-exercise ingestion of at least 40 g of casein protein, approximately 30 minutes before sleep and after a bout of resistance exercise in the evening, might be an effective nutritional intervention to facilitate muscle recovery.

뇌졸중의 운동신경기능 회복 (Motor Recovery in Stroke Patients)

  • 장성호;권용현
    • Journal of Yeungnam Medical Science
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    • 제22권2호
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    • pp.119-130
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    • 2005
  • Stroke is a leading cause of chronic physical disability. The recent randomized controlled trials have that motor function of chronic stroke survivors could be improved through physical or pharmacologic intervention in the stroke rehabilitation setting. In addition, several functional neuroimaging techniques have recently developed, it is available to study the functional topography of sensorimotor area of the brain. However, the mechanisms involved in motor recovery after stroke, are still poorly understood. Four motor recovery mechanisms have been suggested, such as reorganization into areas adjacent to the injured primary motor cortex (M1), unmasking of the motor pathway from the unaffected motor cortex to the affected hand, attribution of secondary motor areas, and recovery of the damaged contralateral corticospinal tract. Understanding the motor recovery mechanisms would provide neurorehabilitation specialists with more information to allow for precise prognosis and therapeutic strategies based on the scientific evidence; this may help promote recovery of motor function. This review introduces several methodologies for neuroimaging techniques and discusses theoretical issues that impact interpretation of functional imaging studies of motor recovery after stroke. Perspectives, for future research are presented.

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Single-Scan Plasma Display Panel(PDP)를 위한 고속 어드레스 에너지 회수 기법 (A High Speed Address Recovery Technique for Single-Scan Plasma Display Panel(PDP))

  • 이준영
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 심포지엄 논문집 정보 및 제어부문
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    • pp.239-242
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    • 2005
  • A high speed address recovery technique for AC plasma display Panel(PDP) is proposed. By removing the GND switching operation, the recovery speed can be increased and switching loss due to GND switch also becomes to be reduced. The proposed method is able to perform load-adaptive operation by controlling the voltage level of energy recovery capacitor, which prevents increasing inefficient power consumption caused by circuit loss during recovery operation. Thus, the technique shows the minimum address power consumption according to various displayed images, different from Prior methods operating in fixed mode regardless of images. Test results with 50" HD single-scan PDP(resolution = 1366$\times$768) show that less than 350ns of recovery time is successfully accomplished and about 54% of the maximum power consumption can be reduced, tracing minimum power consumption curves.

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Single-Scan Plasma Display Panel(PDP)를 위한 고속 어드레스 에너지 회수 기법 (A High Speed Address Recovery Technique for Single-Scan Plasma Display Panel(PDP))

  • 이준용
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제54권9호
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    • pp.450-453
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    • 2005
  • A high speed address recovery technique for AC plasma display panel(PDP) is proposed. Replacing GND switch by clamping diode. the recovery speed can be increased by saving GND hold-time and switching loss due to GND switch also becomes also be reduced. The proposed method is able to perform load-adaptive operation by controlling the voltage level of energy recovery capacitor, which prevents increasing inefficient power consumption caused by circuit loss during recovery operation. Test results with 50' HD single-scan PDP(resolution = 1366$\times$768) show that less than 3sons of recovery time is successfully accomplished and about$54\%$ of the maximum power consumption can be reduced, tracing minimum power consumption curves.

저압 배선용차단기 절연회복특성 파악을 위한 절연회복전압 측정기법 연구 (Study on Measurement Method of Dielectric Recovery Voltage to analysis Dielectric Recovery Characteristic of Molded Case Circuit Breaker)

  • 송태헌;조영만;고광철
    • 조명전기설비학회논문지
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    • 제29권8호
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    • pp.49-54
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    • 2015
  • Molded Circucit Breaker(MCCB) is a most widely used device to protect loads from the over-current in low power level distribution system. When the MCCB interrupts the over-current, the arc discharge occurred between fixed contact and moving contact to create hot gas. By the Lorentz force due to arc current, the occurred arc is bent to the grids. The grids extend and cool and divide it for arc extinguish. In the majority cases, the MCCB protects loads by interrupting the over-current successfully but in some cases the re-ignition is occurred by hot-gas created during process of interruption. The re-ignition arises when the recovery voltage(RV) is more higher than the recovery strength between contacts and it leads to interruption fault. Therefore to find out the dielectric recovery characteristics of protecting device has a great importance for preventing interruption fault. In this paper, we studies measurement method of the dielectric recovery characteristics considering inherent attribute of the MCCB. To measure the dielectric recovery characteristic of MCCB, we makes an experiment circuit for applying the over-current and the randomly recovery voltage. The measurement methode to find out the dielectric recovery voltage of the MCCB was established and the result was based on experiment results.

BTCA에 의한 실크/면 교직물의 DP 가공 (I) - 물리적 특성에 미치는 처리 조건의 영향 - (Durable Press Finishing of Silk/Cotton Fabrics with BTCA ( I ) - Effect of Treating Conditions on Physical Properties -)

  • 이문철;조석현
    • 한국염색가공학회지
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    • 제14권1호
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    • pp.43-50
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    • 2002
  • Silk/Cotton fabrics were treated with butanetetracarboxylic acid(BTCA) to improve crease recovery and anti-shrinking properties at various curing temperatures and pH values. We investigated the effects of finishing conditions on add-on of BTCA, bending property(E, 2HB), wrinkle recovery angle, shrinkage, and dyeing properties. The Add-on of BTCA increased with increasing curing temperature and concentration. Crease recovery was improved with decreasing shrinkage. Maximum add-on of BTCA was showed at pH 2.5. In case of dyeing and mercerization, silk side treated with BTCA was more flexible than untreated, whereas cotton side was more stiff. In dyeing after mercerization, B and 2HB values were higher and K/S values were doubled nearly. The hand of fabric improved with decreasing B and 2HB by the BTCA treatment. BTCA treatment after reactive dyeing improved crease recovery, and caused no change of color difference. However, BTCA treatment after reactive dyeing didn't improve crease recovery, whereas B and 2HB were decreased considerably by the treatment.

Light Source Target Detection Algorithm for Vision-based UAV Recovery

  • Won, Dae-Yeon;Tahk, Min-Jea;Roh, Eun-Jung;Shin, Sung-Sik
    • International Journal of Aeronautical and Space Sciences
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    • 제9권2호
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    • pp.114-120
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    • 2008
  • In the vision-based recovery phase, a terminal guidance for the blended-wing UAV requires visual information of high accuracy. This paper presents the light source target design and detection algorithm for vision-based UAV recovery. We propose a recovery target design with red and green LEDs. This frame provides the relative position between the target and the UAV. The target detection algorithm includes HSV-based segmentation, morphology, and blob processing. These techniques are employed to give efficient detection results in day and night net recovery operations. The performance of the proposed target design and detection algorithm are evaluated through ground-based experiments.

A Study on the Difference in Expectation-Performance of Service Recovery Measurement Scale's 4 Dimensions both Korean Native Cattle Beef and Imported Beef Restaurant

  • Cho, Yoon-Shik;Lee, Mi-Ock
    • Journal of the Korean Data and Information Science Society
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    • 제19권4호
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    • pp.1123-1131
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    • 2008
  • A considerable amount of research has focused on the dimensionality of service failure and recovery construct. This paper is focused on service failure and recovery in the Korean native cattle and imported beef restaurant industry in the Korea. So, this paper has adapted Kau and Loh's Service recovery measurement scale so that restaurant managers can use it to determine how customers perceive the service quality in Korean native cattle beef restaurant and imported beef restaurant. The purpose of this research is to test the difference in pre-purchase expectation and post-purchase actual performance of 4 dimensions between the restaurants that sell the beef of Korean native cattle and imported cattle. The paired t -test is used to test difference of pre-purchase expectation and post-purchase actual performance for service recovery measurement scale's 4 dimensions of the 2 restaurant types. But, there is significant difference between pre-purchase expectation and post-purchase actual performance in the 2 restaurant types.

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