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Radio frequency identification (RFID) has come under the spotlight as technology supporting ubiquitous society. But now, we face several security problems and challenges in RFID systems. Recent papers have reported that RFID systems have to achieve the following requirements: (1) indistinguishability; (2) forward security; (3) replay attack; (4) tag(More)
BACKGROUND The mu event-related desynchronization (ERD) is supposed to reflect motor preparation and appear during motor imagery. The aim of this study is to examine the modulation of ERD with transcranial direct current stimulation (tDCS). METHODS Six healthy subjects were asked to imagine their right hand grasping something after receiving a visual cue.(More)
Attention deficit-hyperactivity disorder (ADHD) has been noted for its high rate of comorbidity. The present study is the first report in Japan evaluating the proportion of comorbidity in ADHD cases presenting in the clinical setting, aiming at clarifying the picture of ADHD in Japan. The subjects consisted of 68 child and adolescent cases meeting criteria(More)
PURPOSE We examined post-activation depression in 35 stroke patients and 10 healthy subjects, and investigated whether their clinical symptoms were correlated to post-activation depression. METHODS Post-activation depression of the soleus H-reflex evoked by electrical stimulation of the common peroneal nerve with supramaximal intensity of motor response(More)
Various portable electronic devices now have wireless interfaces as standard equipment. Such interfaces will be common in ad hoc networks, relaying packets mutually among users' nodes in a network without base stations. However, a fear is emerging of selfish nodes in ad hoc networks. These nodes take advantage of other ones and do not cooperate with others,(More)
The new diagnostic threshold of hemoglobin A(1c) was made based on evidence from cross-sectional studies, and no longitudinal study supports its validity. To examine whether hemoglobin A(1c) of 6.5% or higher defines a threshold for elevated risk of incident retinopathy, we analyzed longitudinal data of 19,897 Japanese adults who underwent a health checkup(More)
BACKGROUND Previous studies have shown a relationship between diffuse axonal injury (DAI) and unfavorable clinical outcome in patients with traumatic brain injury (TBI), but it remains unclear whether the type of DAI lesion influences outcome after TBI. The aim of the present study was to investigate whether 1-year outcome after TBI differed between(More)