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Link-Level Performance of Cooperative Multi-Hop Relaying Networks with MDS Codes
Sakakibara, Katsumi,Ito, Daichi,Taketsugu, Jumpei The Korea Institute of Information and Commucation 2011 Journal of communications and networks Vol.13 No.4
We evaluate the link-level performance of cooperative multi-hop relaying networks with an maximum distance separable (MDS) code. The effect of the code on the link-level performance at the destination is investigated in terms of the outage probability and the spectral efficiency. Assuming a simple topology, we construct an absorbing Markov chain. Numerical results indicate that significant improvement can be achieved by incorporating an MDS code. MDS codes successfully facilitate recovery of the message block at a relaying node due to powerful error-correcting capability, so that it can reduce the outage probability. Furthermore, we evaluate the average number of hops where the message block can be delivered.
Sakakibara, Katsumi,Taketsugu, Jumpei The Korea Institute of Information and Commucation 2010 Journal of communications and networks Vol.12 No.1
IEEE 802.11 defines distributed coordination function (DCF), which is characterized by CSMA/CA and binary exponential backoff (BEB) algorithm. Most modifications on DCF so far have focused on updating of the contention window (CW) size depending on the outcome of own frame transmission without considering freezing periods experienced in the backoff interval. We propose two simple but novel schemes which effectively utilize the number of freezing periods sensed during the current backoff interval. The proposed schemes can be applied to DCF and its family, such as double increment double decrement (DIDD). Saturation throughput of the proposed schemes is analyzed by means of Bianchi's Markovian model. Computer simulation validates the accuracy of the analysis. Numerical results based on IEEE 802.11b show that up to about 20% improvement of saturation throughput can be achieved by combining the proposed scheme with conventional schemes when applied to the basic access procedure.
Sakakibara Fumihiro,Uchida Kazutaka,Yoshimura Shinichi,Sakai Nobuyuki,Yamagami Hiroshi,Toyoda Kazunori,Matsumaru Yuji,Matsumoto Yasushi,Kimura Kazumi,Ishikura Reiichi,Inoue Manabu,Ando Kumiko,Yoshida 대한뇌졸중학회 2023 Journal of stroke Vol.25 No.3
Background and Purpose Differences in measurement of the extent of acute ischemic stroke using the Alberta Stroke Program Early Computed Tomographic Score (ASPECTS) by non-contrast computed tomography (CT-ASPECTS stratum) and diffusion-weighted imaging (DWI-ASPECTS stratum) may impact the efficacy of endovascular therapy (EVT) in patients with a large ischemic core. Methods The RESCUE-Japan LIMIT (Recovery by Endovascular Salvage for Cerebral Ultra-acute Embolism Japan–Large IscheMIc core Trial) was a multicenter, open-label, randomized clinical trial that evaluated the efficacy and safety of EVT in patients with ASPECTS of 3–5. CT-ASPECTS was prioritized when both CT-ASPECTS and DWI-ASPECTS were measured. The effects of EVT on the modified Rankin Scale (mRS) score at 90 days were assessed separately for each stratum. Results Among 183 patients, 112 (EVT group, 53; No-EVT group, 59) were in the CT-ASPECTS stratum and 71 (EVT group, 40; No-EVT group, 31) in the DWI-ASPECTS stratum. The common odds ratio (OR) (95% confidence interval) of the EVT group for one scale shift of the mRS score toward 0 was 1.29 (0.65–2.54) compared to the No-EVT group in CT-ASPECTS stratum, and 6.15 (2.46–16.3) in DWI-ASPECTS stratum with significant interaction between treatment assignment and mode of imaging study (<i>P</i>=0.002). There were significant interactions in the improvement of the National Institutes of Health Stroke Scale score at 48 hours (CT-ASPECTS stratum: OR, 1.95; DWIASPECTS stratum: OR, 14.5; interaction <i>P</i>=0.035) and mortality at 90 days (CT-ASPECTS stratum: OR, 2.07; DWI-ASPECTS stratum: OR, 0.23; interaction <i>P</i>=0.008). Conclusion Patients with ASPECTS of 3–5 on MRI benefitted more from EVT than those with ASPECTS of 3–5 on CT.
Genetic Screening for Spinocerebellar Ataxia Genes in a Japanese Single-Hospital Cohort
Ryuji Sakakibara,Fuyuki Tateno,Masahiko Kishi,Yohei Tsuyusaki,Yosuke Aiba,Hitoshi Terada,Tsutomu Inaoka,Setsu Sawai,Satoshi Kuwabara,Fumio Nomura 대한파킨슨병및이상운동질환학회 2017 Journal Of Movement Disorders Vol.10 No.3
Objective: Diagnosis of sporadic cerebellar ataxia is a challenge for neurologists. A wide range of potential causes exist, including chronic alcohol use, multiple system atrophy of cerebellar type (MSA-C), and sporadic late cortical cerebellar atrophy. Recently, an autosomal-dominant spinocerebellar ataxia (SCA) mutation was identified in a cohort of patients with non-MSA-C sporadic cerebellar ataxia. The aim of this study is to genetically screen genes involved in SCA in a Japanese single-hospital cohort. Methods: Over an 8-year period, 140 patients with cerebellar ataxia were observed. There were 109 patients with sporadic cerebellar ataxia (no family history for at least four generations, 73 patients with MSA-C, and 36 patients with non-MSA-C sporadic cerebellar ataxia) and 31 patients with familial cerebellar ataxia. We performed gene analysis comprising SCA1, 2, 3, 6, 7, 8, 12, 17, 31, and dentatorubro-pallidoluysian atrophy (DRPLA) in 28 of 31 non-MSA-C sporadic patients who requested the test. Familial patients served as a control. Results: Gene abnormalities were found in 57% of non-MSA-C sporadic cerebellar ataxia cases. Among patients with sporadic cerebellar ataxia, abnormalities in SCA6 were the most common (36%), followed by abnormalities in SCA1 (7.1%), SCA2 (3.6%), SCA3 (3.6%), SCA8 (3.6%), and DRPLA (3.6%). In contrast, gene abnormalities were found in 75% of familial cerebellar ataxia cases, with abnormalities in SCA6 being the most common (29%). For sporadic versus familial cases for those with SCA6 abnormalities, the age of onset was older (69 years vs. 59 years, respectively), and CAG repeat length was shorter (23 vs. 25, respectively) in the former than in the latter (not statistically significant). Conclusion: Autosomal-dominant mutations in SCA genes, particularly in SCA6, are not rare in sporadic cerebellar ataxia. The reason for the frequency of mutations in SCA6 remains unclear; however, the reason may reflect a higher age at onset and variable penetrance of SCA6 mutations.
?原秀訓(Sakakibara, Hidenori) 서강대학교 법학연구소 2016 서강법률논총 Vol.5 No.1
연금제도에 대한 「국민의 신뢰」 회복을 위해서 사회보험청을 개혁하여, 특수법인으로 일본연금기구가 발족하였다. 그 때에 국가는 사회보험청 직원의 승계 규정을 따로 두지 않고, 「기본계획」에서 승계조직인 일본연금기구가 사회보험청 직원 중에서 징계처분력이 있는 자를 일률적으로 불채용 하도록 하여, 정부 전체적인 측면에서 분한면직처분 회피의 노력 의무를 하지 않았다. 결과적으로 다수의 직원에 대해서 정리해고로서의 분한면직처분이 이루어졌다. 그러나 분한면직처분 회피의 노력 의무가 있으며, 재량남용론에서 위법성을 판단할 경우 본인에게 책임이 없고, 다른 한 편으로 면직이라는 중대한 불이익 발생하는점에서 판단과정심사 또는 비례원칙심사에 의해 엄격하게 심사가 이루어져야 한다. 또한, 분한면직처분 회피 노력 의무를 지는 주체는 「각의결정」의 존재 등을 고려하면 임명권자인 사회보험청 장관이나 후생노동대신 등에게 한정되어 있지 않고, 정부라 할 수 있다. 그리고 국가와 특수법인인 일본연금기구의 일체성, 「국민의 신뢰」의 회복이라는 법목적에 비추어, 「업무 외 열람」 등에 의한 징계처분력이 있는 직원도 일률적으로 불채용하는 것은 가혹하며, 더욱이 「기본계획」이 「각의결정」에 그친다는 법적 성격과 직원의 권리이익 보호의 필요성을 충분히 고려하지 않고, 그러한 고려 없이 분한면직처분을 한다면 결과적으로 사회관념상(통념상) 현저하게 타당성을 결하여 분한면직처분은 위법이다.