An introduction to Komaki wind tunnel and test results of aerodynamic noise of high-speed train models

Koji Watanabe 한국소음진동공학회 2003 한국소음진동공학회 국제학술대회논문집 Vol.2003 No.8

Effects of Ultrasonic Peening on Fatigue Strength of Out-of-plane Gusset Joints

Koji Kinoshita,Akito Imamura,Yoshihiro Watanabe,Mitsuru Handa 한국강구조학회 2014 International Journal of Steel Structures Vol.14 No.4

Effect of high frequency peening treatment with a small radius tip pin, which is less than 3mm radius tip pin, still remainsunclear, although the effect of ultrasonic impact treatment on fatigue strength has been investigated. The objective of this studyis to investigate the effect of ultrasonic peening with a 1.5mm radius tip pin on fatigue strength of out-of-plane gusset weldedjoints. Plate bending fatigue tests of those joints carried out. The results show that the peening can improve fatigue strength,when mean stress does not change or already changes before the peening is carried out. It also shows that the effect of theultrasonic impact peening become less with increasing mean stress after the ultrasonic peening was carried out, and when theultrasonic peening is not sufficient for the weld toe.

Risk stratification models for para-aortic lymph node metastasis and recurrence in stage IB–IIB cervical cancer

Koji Matsuo,Muneaki Shimada,Tsuyoshi Saito,Kazuhiro Takehara,Hideki Tokunaga,Yoh Watanabe,Yukiharu Todo,Kenichirou Morishige,Mikio Mikami,Toru Sugiyama 대한부인종양학회 2018 Journal of Gynecologic Oncology Vol.29 No.1

Objective: To examine the surgical-pathological predictors of para-aortic lymph node (PAN) metastasis at radical hysterectomy, and for PAN recurrence among women who did not undergo PAN dissection at radical hysterectomy. Methods: This is a retrospective analysis of a nation-wide cohort study of surgically-treated stage IB–IIB cervical cancer (n=5,620). Multivariate models were used to identify independent surgical-pathological predictors for PAN metastasis/recurrence. Results: There were 120 (2.1%) cases of PAN metastasis at surgery with parametrial involvement (adjusted odds ratio [aOR]=1.65), deep stromal invasion (aOR=2.61), ovarian metastasis (aOR=3.10), and pelvic nodal metastasis (single-node aOR=5.39 and multiple-node aOR=33.5, respectively) being independent risk factors (all, p<0.05). Without any risk factors, the incidence of PAN metastasis was 0.9%, while women exhibiting certain risk factor patterns (>20% of the study population) had PAN metastasis incidences of ≥4%. Among 4,663 clinically PAN-negative cases at surgery, PAN recurrence was seen in 195 (4.2%) cases that was significantly higher than histologically PAN-negative cases (2.5%, p=0.046). In clinically PAN-negative cases, parametrial involvement (adjusted hazard ratio [aHR]=1.67), lympho-vascular space invasion (aHR=1.95), ovarian metastasis (aHR=2.60), and pelvic lymph node metastasis (single-node aHR=2.49 and multiple-node aHR=8.11, respectively) were independently associated with increased risk of PAN recurrence (all, p<0.05). Without any risk factors, 5-year PAN recurrence risk was 0.8%; however, women demonstrating certain risk factor patterns (>15% of the clinically PAN-negative population) had 5-year PAN recurrence risks being ≥8%. Conclusion: Surgical-pathological risk factors proposed in this study will be useful to identify women with increased risk of PAN metastasis/recurrence.

Three-Dimensional Analysis of the Ideal Entry Point for Sacral Alar Iliac Screws

Watanabe Noriyuki,Takigawa Tomoyuki,Uotani Koji,Oda Yoshiaki,Misawa Haruo,Tanaka Masato,Ozaki Toshifumi 대한척추외과학회 2022 Asian Spine Journal Vol.16 No.6

Study Design: This is a virtual three-dimensional (3D) imaging study examining computed tomography (CT) data to investigate instrumentation placement.Purpose: In this study, we aim to clarify the ideal entry point and trajectory of the sacral alar iliac (SAI) screw in relationship to the dorsal foramen at S1 and the respective nerve root.Overview of Literature: To the best of our knowledge, there is yet no detailed 3D imaging study on the ideal entry point of the SAI screw. Despite the evidence suggesting that the dorsal foramen at S1 is a landmark on the sacrum, the S1 nerve root disruption is a general concern during the insertion of SAI screws. No other study has been published examining the nerve root location at the S1and SAI screw insertions.Methods: Preoperative CT data from 26 patients pertaining to adult spinal deformities were investigated in this study. We applied a 3D image processing method for a detailed investigation. Virtual cylinders were used to mimic SAI screws. These were placed to penetrate the sacral iliac joint without violating the other cortex. We then assessed the trajectory of the longest SAI screw and the ideal entry point of SAI using a color mapping method on the surface of the sacrum. We measured the location of the nerve root at S1 in relation to the foramen at S1 and the sacral surface.Results: As per the results of our color mapping, it was determined that areas that received high scores are located medially and caudally to the dorsal foramen of S1. The mean angle between a horizontal line and a line connecting the medial edge of the foramen and nerve root at S1 was 93.5°. The mean distances from the dorsal medial edge of the foramen and sacral surface to S1 nerve root were 21.8 mm and 13.9 mm, respectively.Conclusions: The ideal entry point of the SAI screw is located medially and caudally to the S1 dorsal foramen based on 3D digital mapping. It is also shown that this entry point spares the S1 nerve root from possible iatrogenic injuries.

Experimental Investigation of the Effect of Generator Temperature on the Performance of Solution Transportation Absorption Chiller

Koji Enoki,Fumi Watanabe,Atsushi Akisawa,Toshitaka Takei 대한설비공학회 2017 International Journal Of Air-Conditioning and Refr Vol.25 No.3

It is effective to recover waste heat to reduce primary energy consumption. From this point of view, we proposed and examined a new idea of heat transportation using ammonia–water as the working fluid in the system named the Solution Transportation Absorption chiller (STA). As waste heat sources are not necessarily located close to areas of heat demand, conventionally, absorption chillers are located on heat source side and produce chilled water that is transported to heat demand side through pipelines with an insulation. In contrast, the proposed system STA divides an absorption chiller into two parts. The generator and the condenser are located on heat source side while the evaporator and the absorber are on heat demand side. Both the conventional system and STA system satisfy the same boundary condition of heat recovery and heat supply to the demand side, STA can work for transferring thermal energy as the conventional system does even though the temperature of the media is ambient without an insulation. Our previous studies of the STA were based on the experimental investigation with the STA facility where the cooling power was 90kW (25.6 refrigeration ton) at the generator temperature 120 ∘C from 0 m (normal absorption chiller) to 1000 m. Thus, the Coefficient of Performance (COP) of STA was found to have almost the same value of 0.65 with conventional absorption chillers without depending on the transportation distances. The objective of this study is to examine the effect of generator temperature from 100 ∘C to 120 ∘C on the performance of solution transportation of ammonia–water solution, because the generator temperature is directly linked to the waste heat temperature, so its effect needs to be investigated. The experimental facility tested the performance with 0 m (normal absorption chiller), 200 m and 500 m distance. The results indicate that the effect of the generator temperature and solution transportation distances showed no significant on the COP.

Surgical Outcomes of Cervical Myelopathy in Patients with Athetoid Cerebral Palsy: A 5-Year Follow-Up

Kazuyuki Watanabe,Koji Otani,Takuya Nikaido,Kinshi Kato,Hiroshi Kobayashi,Shoji Yabuki,Shin-ichi Kikuchi,Shinichi Konno 대한척추외과학회 2017 Asian Spine Journal Vol.11 No.6

Study Design: Observational cohort study. Purpose: To assess the surgical outcomes of posterior decompression and fusion for cervical myelopathy in patients with athetoid cerebral palsy. Overview of Literature: Patients with athetoid cerebral palsy demonstrate involuntary movements and develop severe cervical spondylosis with kyphosis. In these patients, surgery is often performed at an early age because of myelopathy. A few studies have reported about the long-term outcomes of surgical treatment; however, they contain insufficient information. Methods: From 2003 to 2008, 13 patients with cervical myelopathy due to athetoid cerebral palsy underwent posterior fusion surgery and were included in this study. The Japanese Orthopaedic Association (JOA) score, neck disability index (NDI), C2–7 angle on radiography, and need for additional surgical treatment were examined at 1 and 5 years postoperatively. Results: The mean C2–7 angle was −10.5°±21.1° preoperatively and was corrected to −2.9°±13.5° immediately postoperatively. This improvement was maintained for 5 years. The JOA score was 9.5±2.5 preoperatively and 12.2±1.7 at the 5-year follow-up. NDI was 17±6.9 preoperatively and 16±7.5 at the 5-year follow-up. Patient satisfaction with surgery on a 100-point scale was 62.2±22.5 at the 5-year follow-up. Three patients needed additional surgery for loosening of screws. These results demonstrate good surgical outcomes for posterior fusion at 5 years. Conclusions: Posterior decompression and fusion should be considered a viable option for cervical myelopathy in patients with athetoid cerebral palsy.

Retrospective surveillance of metabolic parameters affecting reproductive performance of Japanese Black breeding cows

Urara Watanabe,Mitsuhiro Takagi,Osamu Yamato,Takeshige Otoi,Koji Okamoto 대한수의학회 2014 JOURNAL OF VETERINARY SCIENCE Vol.15 No.2

This retrospective study was conducted to confirm therelationship between pre- and postpartum metabolicparameters and postpartum reproductive performance and toclarify seasonal characteristics of the metabolic parameters byusing our metabolic profile test (MPT) database of JapaneseBlack breeding herds. In evaluation 1, MPT databases of bloodsamples from multiparous cows collected prepartum andpostpartum were divided into two groups according to calvinginterval, and each MPT parameter was compared. Inevaluation 2, the same MPT databases used in evaluation 1 weredivided into two groups according to the sampling period. Significant differences were found in the prepartal total proteinand postpartal γ-glutamyltransferase in evaluation 1. Inevaluation 2, significant differences were found in the prepartaland postpartal total protein, albumin/globulin ratio, andglucose. Clear seasonal differences in MPT results emphasizedthe usefulness of the MPT in breeding cattle herds fedhome-pasture roughage and suggest that unsatisfactoryreproductive performance during hot periods reflectsinadequate nutritional content of the diet and possible reducedfeed intake due to heat stress.

An Object-Oriented Design for Origami Activities in UML

Hiroshi Ishikawa,Koji Watanabe 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7

In this paper, we show a process to describe an object-oriented design for Origami (act of paper folding) activities based on UML (Unified Modeling Language). We attempt to specify some of those activities in terms of Use Case Diagram, Activity Diagram, and Class Diagram. This work is on-going work and the first step to implement Origami Simulation system.

New Measurement Base De-embedded CPU Load Model for Power Delivery Network Design

Motochika Okano,Koji Watanabe,Masamichi Naitoh,Ichiro Omura 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6

CPU load model including on-chip wiring and package interconnection has been required for printed circuit board (PCB) design of digital products according to the improvement in the speed of CPU operation in recent years. Especially, accurate power delivery network (PDN) information inside CPU is indispensable for PCB design according to requirement of low-impedance and the broadband (from DC to GHz) from the inside of CPU to DC-DC converter. While the detailed impedance information inside CPUs is not disclosed to PCB board designers with the complicated back-end and front-end production design for CPU chip and package. This paper aims to establish new methodology to extract CPU load model with combination of measurement and simulation. The method is simple yet powerful for high-end CPU board design.

Pinhole Detection Method for Gold Films Plated Over a Ni-P Film

Tomohito Katou,Koji Nakajma,Koutoku Inoue,Hideto Watanabe,Hideo Honma 한국표면공학회 2008 한국표면공학회 학술발표회 초록집 Vol.2008 No.-