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A Study on Cluster Lifetime in Multi-HopWireless Sensor Networks with Cooperative MISO Scheme
Huang, Zheng,Okada, Hiraku,Kobayashi, Kentaro,Katayama, Masaaki The Korea Institute of Information and Commucation 2012 Journal of communications and networks Vol.14 No.4
As for cluster-based wireless sensor networks (WSNs), cluster lifetime is one of the most important subjects in recent researches. Besides reducing the energy consumptions of the clusters, it is necessary to make the clusters achieve equal lifetimes so that the whole network can survive longer. In this paper, we focus on the cluster lifetimes in multi-hop WSNs with cooperative multi-input single-output scheme. With a simplified model of multi-hop WSNs, we change the transmission schemes, the sizes and transmission distances of clusters to investigate their effects on the cluster lifetimes. Furthermore, linear and uniform data aggregations are considered in our model. As a result, we analyze the cluster lifetimes in different situations and discuss the requirements on the sizes and transmission distances of clusters for equal lifetimes.
Matsumoto, Kazumasa,Hirayama, Takahiro,Kobayashi, Kentaro,Hirano, Syuhei,Nishi, Morihiro,Ishii, Daisuke,Tabata, Ken-ichi,Fujita, Tetsuo,Iwamura, Masatugu Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.8
Objective: We evaluated the association of body mass index (BMI) with perioperative outcomes in patients who underwent laparoscopic or open radical nephroureterectomy. Materials and Methods: This retrospective single-center study included 113 patients who had been diagnosed with upper urinary tract cancer from January 1998 to June 2013 and were treated with laparoscopic nephroureterectomy (Lap group, n=60) or open nephroureterectomy (Open group, n=53). Laparoscopic nephroureterectomy was performed via a retroperitoneal approach following an open partial cystectomy. The two surgical groups were stratified into a normal-BMI group (<25) and a high-BMI group ($BMI{\geq}25$). The high-BMI group included 27 patients: 13 in the Lap group and 14 in the Open group. Results: Estimated blood loss (EBL) in the Lap group was much lower than that in the Open group irrespective of BMI (p<0.01). Operative time was significantly prolonged in normal-BMI patients in the Lap group compared to those in the Open group (p=0.03), but there was no difference in operative time between the Open and Lap groups among the high-BMI patients. Multivariate logistic regression analysis of the data for all the cohorts revealed that the open procedure was a significant risk factor for high EBL (p<0.0001, hazard ratio 8.02). Normal BMI was an independent predictor for low EBL (p=0.01, hazard ratio 0.25). There was no significant risk factor for operative time in multivariate analysis. There were no differences in blood transfusion rates or adverse event rates between the two surgical groups. Conclusions: Laparoscopic radical nephroureterectomy via a retroperitoneal approach can be safely performed with significantly reduced EBL even in obese patients with upper urinary tract cancer.
A Study on Cluster Lifetime in Multi-HopWireless Sensor Networks with Cooperative MISO Scheme
Zheng Huang,Hiraku Okada,Kentaro Kobayashi,Masaaki Katayama 한국통신학회 2012 Journal of communications and networks Vol.14 No.4
As for cluster-based wireless sensor networks (WSNs),cluster lifetime is one of the most important subjects in recent researches. Besides reducing the energy consumptions of the clusters,it is necessary to make the clusters achieve equal lifetimes so that the whole network can survive longer. In this paper, we focus on the cluster lifetimes in multi-hop WSNs with cooperative multiinput single-output scheme. With a simplified model of multi-hop WSNs, we change the transmission schemes, the sizes and transmission distances of clusters to investigate their effects on the cluster lifetimes. Furthermore, linear and uniform data aggregations are considered in our model. As a result, we analyze the cluster lifetimes in different situations and discuss the requirements on the sizes and transmission distances of clusters for equal lifetimes.
Assisting Authors to Convert Raw Products into Polished Prose
( Takumi Ito ),( Tatsuki Kuribayashi ),( Hayato Kobayashi ),( Ana Brassard ),( Masato Hagiwara ),( Jun Suzuki ),( Kentaro Inui ) 서울대학교 인지과학연구소 2020 Journal of Cognitive Science Vol.21 No.1
Being a notoriously complex problem, writing is generally decomposed into a series of subtasks: idea generation, expression, revision, etc. Given some goal, the author generates a set of ideas (brainstorming), which he integrates into some skeleton (outline, text plan, outline). This leads to a first draft which is submitted then for revision possibly yielding changes at various levels (content, structure, form). Having made a draft, authors usually revise, edit, and proofread their documents. We confine ourselves here only to academic writing, focusing on sentence production. While there has been quite some work on this topic, most writing assistance has mainly dealt with grammatical errors, editing and proofreading, the goal being the correction of surface-level problems such as typography, spelling, or grammatical errors. We broaden the scope by also including cases where the entire sentence needs to be rewritten in order to express properly all of the information planned. Hence, Sentence-level Revision (SentRev) becomes part of our writing assistance task. Obviously, systems performing well in this task can be of considerable help for inexperienced authors by producing fluent, well-formed sentences based on the user’s drafts. In order to evaluate our SentRev model, we have built a new, freely available crowdsourced evaluation dataset which consists of a set of incomplete sentences produced by nonnative writers paired with final version sentences extracted from published academic papers. We also used this dataset to establish baseline performance on SentRev.
M¨ossbauer Spectroscopy of Fe-doped Valence-fluctuating α-YbAlB4
Yui Sakaguchi,Shugo Ikeda,Hisao Kobayashi,Kentaro Kuga,Keita Sone,Satoru Nakatsuji 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The magnetic properties of high-quality 25 at.% Fe doped α-YbAlB4 with an orthorhombicPbam structure were investigated by using magnetization measurements and 57Fe M¨ossbauer spectroscopy. The temperature dependence of the magnetization along the a-axis showed anomaliesat TN2 7.7 K and TN1 10.4 K. Broadenings of the peaks in the M¨ossbauer spectrum wereobserved at temperatures below 6 K, which were due to the magnetic hyperfine fields transferredfrom the Yb magnetic moments. The evaluated transferred magnetic hyperfine field almost disappearsaround TN2. The anomalous temperature dependence of the transferred magnetic hyperfinefield reveals that the magnetic structure and the ordered magnetic moments of the Yb ions showcomplex temperature dependences at temperatures below TN1.
Takahashi, Keitaro,Ueno, Nobuhiro,Sasaki, Takahiro,Kobayashi, Yu,Sugiyama, Yuya,Murakami, Yuki,Kunogi, Takehito,Ando, Katsuyoshi,Kashima, Shin,Moriichi, Kentaro,Tanabe, Hiroki,Kamikokura, Yuki,Yuzawa, The Korean Gastric Cancer Association 2021 Journal of gastric cancer Vol.21 No.1
Gastric adenocarcinoma of the fundic gland mucosa type (GA-FGM) was proposed as a new variant of gastric adenocarcinoma of the fundic gland type (GA-FG). However, at present, the influence of Helicobacter pylori and the speed of progression and degree of malignancy in GA-FGM remain unclear. Herein, we report the first case of intramucosal GA-FGM that was endoscopically observed before and after H. pylori eradication over 15 years. The lesion showed the same tumor size with no submucosal invasion and a low MIB-1 labeling index 15 years after its detection using endoscopy. The endoscopic morphology changed from 0-IIa before H. pylori eradication to 0-IIa+IIc and then 0-I after H. pylori eradication. These findings suggest that the unaltered tumor size reflects low-grade malignancy and slow growth, and that the endoscopic morphology is influenced by H. pylori eradication.
Yasui, Takahiro,Tozawa, Keiichi,Ando, Ryosuke,Hamakawa, Takashi,Iwatsuki, Shoichiro,Taguchi, Kazumi,Kobayashi, Daichi,Naiki, Taku,Mizuno, Kentaro,Okada, Atsushi,Umemoto, Yukihiro,Kawai, Noriyasu,Sasak Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.15
Background: To explore the safety, efficacy, and oncological outcome of 3-port laparoscopic radical cystectomy (LRC) compared to open radical cystectomy (ORC) in patients older than 75 years. Materials and Methods: From June 2010 to July 2014, we analyzed 16 radical cystectomies in patients older than 75 years (LRC group=8; ORC group=8). Demographic parameters, operative variables, and perioperative outcome in the 2 groups were retrospectively collected, analyzed, and compared. Results: Patients in both groups had comparable preoperative characteristics. A significantly longer operating time (476 vs. 303 min, P=0.0002) and less estimated blood loss (627 vs. 2,106 mL, P=0.021) were observed in the LRC group compared to the ORC group. Infection and ileus were the most common early complications after surgery. Patients who underwent ORC suffered from more postoperative infection (22.2% vs. 0.0%, P=0.054) and ileus (25.0% vs. 12.5%, P=0.521) than the LRC group, but the difference was not significant. Conclusions: Judging from this initial trial, 3-port LRC can be safely carried out in elderly patients. We suggest 3-port LRC as the primary intervention to treat muscle-invasive or high-risk nonmuscle-invasive bladder cancer in elderly patients with an otherwise relatively long life expectancy.