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The avoidance from central node of selected routes by centrality measure
Yoshihiro Kaneko 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
An ad-hoc network requires no fixed infrastructure, which is composed of terminals that communicate with each other as well as transmit data like a router. For load balancing, we have proposed to apply node centrality measure, to one of the most popular routing protocol DSDV. Our proposal idea is to avoid nodes located in the central area as far as possible. We have tested its validity on network simulator ns-3. However, its effectiveness seems yet limited at present. Thus, in order to develop our proposal, we observe properties of obtained routes. This paper discusses the relation between relay nodes on those routes and central node in viewpoint of avoidance. First we locate central nodes by three node centrality measures such as closeness, degree and betweenness. We deal with sixty network models with link density 5 to 10%. As a result, we show that betweenness centrality measure always provides single central node. Next we examine how far those obtained routes pass from central node. Finally, of the three measures, we show that closeness centrality-aware routing provides routes whose relay nodes are the most distant on average from central node.
User keystroke authentication based on stable digraph pairs
Yoshihiro KANEKO,Taku YAMAMOTO 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
Both Joyce-Gupta method and Bergadano-Guntetti-Picardi method are well-known for user keystroke dynamics authentication by comparing latency of two consecutive keystroke, termed digraph, of test sample with that of reference sample. By millisecond units, one does not always type keys with the same keystroke latency. However, it seems that some digraphs are always faster than other slow digraphs, which is stable and unique to person. In this paper, we call such fast and slow digraph pair a stable digraph pair, based on which we propose a new method for user keystroke authentication. By combining the previous methods, we have tested our approach on 7 individuals, for a total of 35 samples achieving both false alarm rate and impostor pass rate of 0%, which is better result than those methods alone.
Keystroke dynamics-based user authentication by Japanese old poems
Takuya TSUJIMOTO,Yoshihiro KANEKO 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
Needless to say, computer systems should be more secure for our safe life and society nowadays. A keystroke dynamics-based user authentication is known as one of potentially valid biometrics. In our previous research, input text requiring about two hundred keystrokes provides less than 1% EER, Equal Error Rate, for fifty-one subjects. To improve data input situation, this paper deals with one third shorter texts. Those texts are Japanese old poems composed of 5-7-5-7-7 syllabaries. We have asked thirty-five subjects to type these poems requiring about sixty keystrokes each three times. By user authentication experiments, we have achieved around EER 4 to 7%.
Hee Jae Jung,Hye Jin Kim,Kensuke Kaneko,Yoshihiro Kazama,Kazushige Kawai,Soichiro Ishihara,Gyu Seog Choi 대한종양외과학회 2018 Korean Journal of Clinical Oncology Vol.14 No.2
Purpose: Previous studies have addressed the role of the hypercoagulable state in the pathogenesis of cancer progression and metastasis. In this study, we investigated the association between coagulation factors, including tissue factor (TF) expression, platelet count, and fibrinogen level, and disease recurrence in patients with non-metastatic colorectal cancer. Methods: Patients who underwent curative resection for stage II or III colorectal cancer between 2000 and 2007 were included in this study. Data from a prospectively maintained database were retrospectively reviewed. TF expression was determined by immunohistochemistry using an anti-TF monoclonal antibody. The Kaplan-Meier method was used to estimate 5-year disease-free survival. Results: TF was highly expressed in 257 of 297 patients (86.5%). TF expression was not significantly associated with the platelet counts (P=0.180) or fibrinogen level (P=0.281). The 5-year disease-free survival rate was lower in patients with high TF expression than in patients with low TF expression (72.3% vs. 83.9%, P=0.074). In Cox hazard analysis, high TF expression was an independent risk factor for tumor re�currence (hazard ratio [HR] 2.446; 95% confidence interval [CI], 1.054–5.674; P=0.037). Undifferentiated histologic type (HR, 2.911; 95% CI, 1.308–6.481; P=0.009), venous invasion (HR, 2.784; 95% CI, 1.431–5.417; P=0.003), and lymph node metastasis (HR, 2.497; 95% CI, 1.499–4.158; P<0.001), were also significantly associated with disease recurrence. Conclusion: TF expression is associated with a recurrence in patients with non-metastatic colorectal cancer. However, further studies are re�quired to clarify the underlying mechanisms relating TF expression with oncologic outcomes and its potential role as a therapeutic target.