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Can Diffusion-Weighted Magnetic Resonance Imaging Predict a High Gleason Score of Prostate Cancer?
Katsumi Shigemura,Nozomu Yamanaka,Masuo Yamashita 대한비뇨의학회 2013 Investigative and Clinical Urology Vol.54 No.4
Purpose: To determine the relationship between cancer-positive findings on diffusion-weighted imaging (DWI) magnetic resonance imaging (MRI) and the Gleason score (GS) of radical prostatectomy specimens in prostate cancer (PC). Materials and Methods: We performed a retrospective study of 105 consecutive patients with PC who underwent radical prostatectomy between January 2009 and October 2011 with DWI MRI and full data available for analyses. Prostatectomy specimen pathology included GS, margin status, and capsule invasion, and the clinical factors investigated included age and serum prostate-specific antigen. We investigated the relationship between positive DWI MRI results and these pathological and clinical factors. Results: PC was diagnosed in 62 of 105 patients on DWI MRI. The prostatectomy specimens revealed that the number of cases with GS >4+3 was significantly greater in patients with PC-positive DWI MRI results (34/62, 54.80%) than in those with PC-negative results (2/43, 2.33%; p<0.0001). Positive surgical margins occurred significantly more often in cases with PC-positive DWI MRI results (31/62, 50.0%, compared with 9/43, 21.4%; p=0.0253), and patients with a single tumor lesion in DWI MRI had significantly higher GSs than did those with multiple tumor lesions (p=0.0301). Our statistical results with multiple regression analysis showed that PC-positive DWI MRI results are significantly associated with high GSs. Conclusions: DWI MRI may help to predict high GSs in prostatectomy specimens. Further studies assessing a greater number of patients will be necessary for a definitive evaluation of DWI MRI as a diagnostic tool for determining PC malignancy.
Katsumi Imaizumi 한국식품영양과학회 2001 한국식품영양과학회 학술대회발표집 Vol.50 No.-
Soybean, rice and nuts are the staple foods in South East Asia. In order to clarify the function of these foods in relation to coronary heart diseases, we have done a series of experiments using animals and humans. Soybean protein preparations (SPI) in comparison with an animal protein, casein (CAS), resulted in reducing atherosclerotic lesion development in apolipoprotein (apo) E deficient mice that develop an advanced lesion similar to that in humans. This action was attributed to the protein, since the ethanol-extracted SPI (EE-SPI), from which isoflavones and saponins removed, lowered the lesion development in apo E-deficient mice. However, The EE-SPI, compared to the SPI, resulted in a decrease of mRNA for key proteins of cholesterol metabolism (low density lipoprotein receptor and cholesterol 7α-hydroxylase) in hypercholesterolemic rats, followed by an elevation of the serum cholesterol level, indicating a contribution of isoflavones to the serum cholesterol level. Rice protein (RPI) was also effective to lower the lesion development in apo E deficient mice. Both the SPI and RPI led to an increased level of the serum NO ₂/NO₃, metabolites of NO. This effect appeared to be attributed to their high content of arginine. Besides, C57BL/6J mice fed a diet containing whole grain rice had an elevation of the serum high-density lipoprotein cholesterol. Furthermore, rice bran oil and the unsaponifiable fraction that is rich in plant sterols were effective to lower serum cholesterol levels in hypercholeserolemic rats. Finally, we tested if walnuts consumption would be hypocholesterolemic for Japanese. A diet containing walnuts effectively lowered the serum total and low density lipoprotein cholesterol in Japanese men and women. These animal and human experiments would be relevant to advocate publics to keep consuming diets including soybean, rice and nuts for their healthful life.
A Flexible Branch and Bound Method for the Job Shop Scheduling Problem
Katsumi Morikawa,Katsuhiko Takahashi 대한산업공학회 2009 Industrial Engineeering & Management Systems Vol.8 No.4
This paper deals with the makespan minimization problem of job shops. The problem is known as one of hard problems to optimize, and therefore, many heuristic methods have been proposed by many researchers. The aim of this study is also to propose a heuristic scheduling method for the problem. However, the difference between the proposed method and many other heuristics is that the proposed method is based on depth-first branch and bound, and thus it is possible to find an optimal solution at least in principle. To accelerate the search, when a node is judged hopeless in the search tree, the proposed flexible branch and bound method can indicate a higher backtracking node. The unexplored nodes are stored and may be explored later to realize the strict optimization. Two methods are proposed to generate the backtracking point based on the critical path of the current best feasible schedule, and the minimum lower bound for the makespan in the unexplored sub-problems. Schedules are generated based on Giffler and Thompson"s active schedule generation algorithm. Acceleration of the search by the flexible branch and bound is confirmed by numerical experiment.
Evaluation of Flight Size Auto Tuning On 3.5G Commercial Wireless Packet Access Network
Katsumi Sekiguchi,Satoru Imai,Yukie Yamamoto,Noriyoshi Meuchi,Osamu Takahashi 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In this paper, we evaluate a performance of Flight Size Auto Tuning (FS-AT), a TCP congestion control method for high speed wireless access networks, on the commercial network of 3G and 3.5G mobile communication systems. HSDPA expands a bandwidth of IMT-2000 to maximum at 14Mbps. The expanded bandwidth increases bandwidth delay product (BDP) on an end-to-end channel. TCP is necessary to set congestion window (cwnd) larger than BDP to achieve maximum throughput of the channel capability. However, if cwnd becomes too large for BDP, TCP sender transmits packets excessively and packets are accumulated on a radio interwoking node. To solve this problem, FS-AT is proposed as a congestion control method for high speed wireless access networks. In this paper, we implementedFS-AT on Linux Server and evaluated its performance on the commercial packet access network of 3G and 3.5G mobile communication systems.
Component Commonality and Order Matching Rules in Make-to-Forecast Production
Katsumi Morikawa,Yusuke Deguchi,Katsuhiko Takahashi,Daisuke Hirotani 대한산업공학회 2010 Industrial Engineeering & Management Systems Vol.9 No.3
Make-to-forecast production is a way to realize high customization and fast responsiveness. This study firstly investigates the effect of introducing a common component in a make-to-forecast production environment. The common component can eliminate a modification step, which is a major cost component in make-to-forecast production. It is illustrated, however, that introducing a versatile component that merely covers several variants is unattractive, and thus adding values to the common component is inevitable in this environment. Secondly, an order-matching rule under the condition that two partially overlapped delivery lead time intervals exist is proposed. The rule considers the effect of matching orders to units that can cover both intervals. An alternative re-matching rule is also developed and examined. Numerical experiments clarify that the proposed rule generally realizes higher contribution ratio and lower percentages of orphans and rejected orders. The proposed re-matching rule increases the average contribution ratio at the expense of increased orphans and order rejections.
Current Status and Important Issues on Seismic Hazard Evaluation Methodology in Japan
KATSUMI EBISAWA 한국원자력학회 2009 Nuclear Engineering and Technology Vol.41 No.10
The outlines of seismic PSA implementation standards and seismic hazard evaluation procedure were shown. An overview of the cause investigation of seismic motion amplification on the Niigata-ken Chuetsu-oki (NCO) earthquake was also shown. Then, the contents for improving the seismic hazard evaluation methodology based on the lessons learned from the NCO earthquake were described. (1) It is very important to recognize the effectiveness of a fault model on the detail seismic hazard evaluation for the near seismic source through the cause investigation of the NCO earthquake. (2) In order to perform and proceed with a seismic hazard evaluation, the Japan Nuclear Energy Safety Organization has proposed the framework of the open deliberation rule regarding the treatment of uncertainty which was made so as to be able to utilize a logic tree. (3) The b-value evaluation on the “Stress concentrating zone,” which is a high seismic activity around the NCO hypocenter area, should be modified based on the Gutenberg-Richter equation.