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Light(Science & Applications) 2022年第1期11卷 79-86页

作者： Shuki Enomoto Tomoya Tagami Yusuke Ueda Yuta Moriyama Kentaro Fujiwara Shun Takahashi kenichi yamashita Faculty of Electrical Engineering and Electronics Kyoto Institute of TechnologyMatsugasakiSakyo-kuKyoto 606-8585Japan

Lead-halide perovskites are highly promising for various optoelectronic applications,including laser ***,fundamental photophysics explaining the coherent-light emission from this material system is so intricate and often the subject of ***,we systematically investigate photoluminescence properties of all-inorganic perovskite microcavity at room temperature and discuss the excited state and the light–matter coupling regime depending on excitation ***-resolved photoluminescence clearly exhibits that the microcavity system shows a transition from weak coupling regime to strong coupling regime,revealing the increase in correlated electron–hole *** pumping fluence above the threshold,the photoluminescence signal shows a lasing behavior with bosonic condensation characteristics,accompanied by long-range phase *** excitation density required for the lasing behavior,however,is found to exceed the Mott density,excluding the exciton as the excited *** results demonstrate that the polaritonic Bardeen–Cooper–Schrieffer state originates the strong coupling formation and the lasing behavior.

关键词： pumping coupling regime

A Proposal of Hyperbolic Fitting Method by Applying the Properties of Functions for Plateau Surface Analysis in ISO 13565-3

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Nanomanufacturing and Metrology 2021年第2期4卷 86-96页

作者： Ryo Sakakibara Ichiro Yoshida Yuki Kondo Munetoshi Numada kenichi yamashita HOSEI University Graduate School 3-7-2 KajinochoKoganei-shiTokyo184-8584Japan Faculty of Science and Engineering HOSEI University3-7-2 KajinochoKoganei-shiTokyo184-8584Japan Faculty of Engineering Chukyo University101-2 YagotohonmachiNagoyaShowa-kuAichi466-8666Japan ISUZU Advanced Engineering Center LTD8 TsuchidanaFujisawa-shiFujisawa-shiKanagawa252-0881Japan

ISO 13565-3 provides an evaluation method for plateau structure surfaces used as sliding surfaces in machine tools and automobile *** evaluation method for plateau structure surfaces of ISO 13565-3 has problems,such as the processing procedure has an ambiguous basis,and the calculation method is not *** existing evaluation method that solves these problems requires the implementation of a difficult *** subsequent evaluation methods,these problems were resolved,and the implementation of complicated calculation algorithms became ***,these methods use algorithms that do not conform to the evaluation method of ISO *** lack of adherence to the ISO standard may hinder their application in the industrial ***,in this study,a new method that conforms to the evaluation method of ISO 13565-3 with a more concise algorithm was *** concluded that this proposed method can contribute to the formation of plateau surfaces and production control in the industrial world.

关键词： Stratified functional properties Plateau surface Surface texture Surface roughness Material probability curve

Bovine sperm selection procedure prior to cryopreservation for improvement of post-thawed semen quality and fertility

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Journal of Animal Science and Biotechnology 2020年第1期11卷 44-57页

作者： MariaPortia B.Nagata Junki Egashira Naoto Katafuchi Kenji Endo Kazuko Ogata kenichi Yamanaka Tadayuki Yamanouchi Hideo Matsuda Yutaka Hashiyada kenichi yamashita Advanced Manufacturing Research Institute National Institute of Advanced Industrial Science and Technology(AIST)807-1 Shuku-machiTosuSaga 841-0052Japan Saga Prefectural Livestock Experiment Station 23242-2 Yamauchi-machiMiyanoTakeoSaga 849-2305Japan Morinaga Dairy Service Co.Ltd. 1-159 ToyoharaotsuNasu-gun Nasu-machiTochigi 329-3224Japan National Livestock Breeding Center(NLBC) 1 OdakuraharaOdakuraNishigo-muraNishishirakawa-gunFukushima 961-8511Japan Institute of Livestock and Grassland Science National Agriculture and Food Research Organization(NARO)Ikenodai 2TsukubaIbaraki 305-0901Japan Faculty of Agriculture Saga University1 Honjo-machiSaga 840-8502Japan.7Ishikawa Prefectural University1-308 SuematsuNonoichi-shiIshikawa 921-8836Japan.

Background:The application of cryopreservation and artificial insemination technology have contributed to the advancement of animal ***,a substantial proportion of spermatozoa undergoes alterations and loses their fertility during cryopreservation,rendering the frozen-thawed semen impractical for routine *** is known to reduce sperm lifespan and *** in cryosurvival of spermatozoa from different sires and even with the individual sire is common in artificial insemination(AI)*** goal is to improve post-thawed semen quality by optimization of cryopreservation technique through sperm selection prior to cryopreservation ***:Our strategy of sperm selection based on rheotaxis and thermotaxis(SSRT)on macrosale in a rotating fluid flow demonstrated the ability to maintain the original pre-freezing structural integrity,viability and biological function related to fertilization *** strategy has a positive effect on the cryosurvival and fertilizing abilities of spermatozoa as supported by the improvement on pregnancy rate of Japanese Black heifers and Holstein repeat *** technique protected further sublethal damage to bovine spermatozoa(higher%cryosurvival than the control)and resulted in the improvement of DNA *** selected spermatozoa demonstrated slower and controlled capacitation than unprocessed control which is thought to be related to sperm longevity and consequently to appropriate timing during in vivo ***:These results provide solid evidence that improvement of post-thawed semen quality by SSRT method is beneficial in terms of cryosurvival,longevity of post-thawed sperm,and optimization of in vivo fertilization,embryo development and calving as supported by the favorable results of field fertility study.

关键词： Cryopreservation Fertility Livestock Rheotaxis Spermatozoa Thermotaxis

Link Stress Reduction against Bursty Arrivals of Content Requests

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International Journal of Communications, Network and System Sciences 2012年第5期5卷 272-279页

作者： kenichi yamashita Kazumasa Oida Department of Computer Science and Engineering Fukuoka Institute of Technology Wajiro-Higashi Fukuoka Japan

Content delivery networks are designed to extend the end-to-end transport capability of the Internet to cope with increases in video traffic. For further improvement, bursty request arrivals should be efficiently addressed. As opposed to previous approaches, in which the best client-server pair is individually selected (individual optimization), this paper proposes an algorithm for dealing with simultaneous arrival requests, in which client-server pairs are selected such that all requests receive good service (social optimization). The performance of the proposed algorithm is compared with that of the closest algorithm, an individual optimization algorithm, under the condition that a large number of requests arrive simultaneously. The evaluation criterion is the worst link stress, which is the largest number of streams per link. The numerical results show that the proposed algorithm is effective for large-scale networks and that the closest algorithm does not provide near-optimal solutions, especially when all requests arrive in a small part of the network or when there are many servers.

关键词： Social Optimization Content Delivery Hypercube Overlay Server Assignment Link Stress

Synchronous pancreatic solid pseudopapillary neoplasm and intraductal papillary mucinous neoplasm

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World Journal of Gastroenterology 2013年第21期19卷 3358-3363页

作者： kenichi Hirabayashi Giuseppe Zamboni Hiroyuki Ito Masami Ogawa Yoshiaki Kawaguchi Tomohiro yamashita Toshio Nakagohri Naoya Nakamura Department of Pathology Tokai University School of MedicineIsehara 259-1193Japan Department of Pathology Ospedale Sacro Cuore Don Calabria37024 Negrar VeronaItaly Department of Pathology University of Verona37134 Negrar VeronaItaly Department of Gastroenterology Tokai University School of MedicineIsehara 259-1193Japan Department of Radiology Tokai University School of MedicineIsehara 259-1193Japan Department of Gastroenterological Surgery Tokai University School of MedicineIsehara 259-1193Japan

Solid pseudopapillary neoplasm (SPN) is a rare and low-grade malignant pancreatic neoplasm composed of poorly cohesive monomorphic neoplastic cells forming solid and pseudopapillary structures with frequent hemorrhagic-cystic degeneration. Intraductal papillary mucinous neoplasm (IPMN) is a pancreatic exocrine tumor composed of intraductal papillary growth of mucin containing neoplastic cells in the main pancreatic duct or its major branches. In the case presented here, a 53-year-old, Japanese man was found to have multiple cystic lesions and dilatation of the main pancreatic duct in the neck of the pancreas. Histological examination revealed a main-duct and branch-duct type IPMN, of the gastric-type, involving the neck of the pancreas, associated with a 0.5 cm SPN in the caudal side of the IPMN. We diagnosed this case as synchronous SPN and IPMN. As far as we know, only one other case of synchronous SPN and IPMN has been reported. Both the present case and the previously reported case showed abnormal nuclear expression of β-catenin in SPN, whereas IPMN showed no abnormal nuclear expression. These results suggest that β-catenin abnormality is not a common pathogenetic factor of synchronous SPN and IPMN.

关键词： Intraductal papillary mucinous neoplasms Solid pseudopapillary neoplasms Pancreatic neoplasms Synchronous neoplasms Pancreas Beta-catenin

Small serotonin-positive pancreatic endocrine tumors caused obstruction of the main pancreatic duct

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World Journal of Gastroenterology 2012年第45期18卷 6669-6673页

作者： Masami Ogawa Yoshiaki Kawaguchi Atsuko Maruno Hiroyuki Ito Toshio Nakagohri kenichi Hirabayashi Hiroshi Yamamuro Tomohiro yamashita Tetsuya Mine Department of Gastroenterology Tokai University School of Medicine143 ShimokasuyaIsehara 259-1193Japan Department of Gastroenterological Surgery Tokai University School of Medicine143 ShimokasuyaIsehara 259-1193Japan Department of Pathology Tokai University School of Medicine143 ShimokasuyaIsehara 259-1193Japan Department of Radiology Tokai University School of Medicine143 ShimokasuyaIsehara 259-1193Japan

We report 2 cases of pancreatic endocrine tumors that caused obstruction of the main pancreatic duct(MPD).A 49-year-old asymptomatic man was referred to our institution because dilation of the MPD was revealed by abdominal ultrasonography(US).No tumor was detected by endoscopic ultrasonography,computed tomography(CT),and magnetic resonance imaging(MRI).The diameter of the MPD was > 20 mm at the body,and no dilation was noted at the *** malignancy was not confirmed through cytology or imaging,pancreatic cancer was strongly ***-denectomy was *** and immunohistochemical examination revealed a 5 mm × 3 mm serotonin-positive endocrine *** was present around the MPD and seemed to cause stricture.A 32-year-old asymptomatic man had elevated serum amylase,and US demonstrated dilation of the *** tumor was detected by CT and *** cancer was suspected due to stricture and dilation of the *** of middle part of pancreas was *** and immunohistochemical examination revealed a serotonin-positive endocrine tumor sized 5 mm × 4 *** report 2 cases of serotonin-positive pancreatic endocrine tumors that caused stricture of the MPD in spite of the small size of the tumor.

关键词： Serotonin Pancreatic endocrine tumor Main pancreatic duct Obstruction Dilatation

Recurrent chromosomal rearrangements at bands 8q24 and 11q13 in gastric cancer as detected by multicolor spectral karyotyping

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World Journal of Gastroenterology 2005年第33期11卷 5129-5135页

作者： Yasuhide yamashita Kazuhiro Nishida Takashi Okuda kenichi Nomura Yosuke Matsumoto Shoji Mitsufuji Shigeo Horiike Hiroyuki Hata Chohei Sakakura Akio Hagiwara Hisakazu Yamagishi Masafumi Taniwaki Department of Gastroenterology and Hepatology Kyoto Prefectural University of Medicine Kyoto 602-8566 Japan Department of Hematology and Oncology Kyoto Prefectural University of Medicine Kyoto 602-8566 Japan Second Department of Internal Medicine Kumamoto University School of Medicine Kumamoto 860-8555 Japan Department of Digestive Surgery Kyoto Prefectural University of Medicine Kyoto 602-8566 Japan Department of Clinical Molecular Genetics and Laboratory Medicine Kyoto Prefectural University of Medicine Kyoto 602-8566 Japan

AIM: To identify chromosomal translocations specific to gastric cancer (GC), spectral karyotyping (SKY) analysis was performed on established cell lines and cancerous ascitic ***: SKY analysis of 10 established cell lines and seven cancerous ascitic fluid samples identified recurrent chromosomal breakpoints and translocations in GC,several of which involved chromosomal loci of oncogenes or tumor suppressor ***: A total of 630 chromosomal breaks were identified. Chromosome no.8 was the most frequently involved in rearrangements (65 breaks), followed by chromosomes no. 11 (53), no. 1 (49), no. 7 (46), no. 13 (37), no. 3 (36), no. 17 (33), and no. 20 (29). Frequent breakpoints were detected in 8q24.1 (30 breaks), 11q13 (29), 13q14 (16), 20q11.2 (14), 7q32 (13), 17q11.2 (13),18q21 (12), 17q23 (9), 18q11.2 (9). SKY analysis identified a total of 242 chromosomal rearrangements including 190 reciprocal and non-reciprocal translocations. The recurrent combinations of chromosomal bands involved in translocations were 8q24.1 and 13q14 (3 cases), 8q24.1 and 11q13 (3), 11q13 and 17q11.2 (2), and 18q11.2 and 20q11.2 (2). Our study validated the ability of SKY to characterize in detail the chromosomal rearrangements in solid tumors and derived cell lines. Moreover,fluorescence in situ hybridization helped to identify the insertions, translocations, and homogeneously staining regions of MYCand CCND1 gene ***: The non-random co-localization of certain cytogenetic bands suggests the importance of chromosomal translocations in gastric carcinogenesis, by serving as landmarks for the cloning of GC causing genes.

关键词： Gastric cancer SKY FISH Chromosomaltranslocation

Appendicitis with psoas abscess successfully treated by laparoscopic surgery

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World Journal of Gastroenterology 2014年第25期20卷 8317-8319页

作者： Yasunori Otowa Yasuo Sumi Shingo Kanaji Kiyonori Kanemitsu Kimihiro yamashita Tatsuya Imanishi Tetsu Nakamura Satoshi Suzuki kenichi Tanaka Yoshihiro Kakeji Division of Gastrointestinal Surgery Department of SurgeryKobe University Graduate School of Medicine 7-5-2 Kusunokichou Chuo-ku Kobe Hyogo Prefecture 650-0017 Japan Division of Gastrointestinal Surgery Department of SurgeryKobe University Graduate School of Medicine7-5-2 KusunokichouChuo-ku KobeHyogo Prefecture 650-0017Japan

Although acute appendicitis is a common disease, retroperitoneal abscesses are rarely observed. Here, we report a case consisting of a psoas abscess and cutaneous fistula caused by appendicitis. The patient was a 56-year-old male who was introduced to our institution due to an intractable right psoas abscess. Imaging tests had been performed over the previous 3 years; however, clinicians could not find the origin of the abscess and failed to resolve the problem. A successful operation was performed via a laparoscopic approach, and 17 mo have passed without recurrence. The advantage of laparoscopic surgery is well understood in cases of appendicitis with abscesses. However, the indication for laparoscopic approach is not clear for retroperitoneal abscesses. From our experience, we can conclude that appendicitis with retroperitonealabscesses can be managed and treated using a laparoscopic approach.

关键词： Appendicitis Laparoscopic surgery Psoas abscess Retroperitoneal abscess Right leg pain

Effects of Subcutaneous Closed Suction Drain for the Prevention of Incisional SSI in Patients with Colorectal Perforation

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Surgical Science 2014年第3期5卷 122-127页

作者： Yasuo Sumi Kimihiro yamashita Kiyonori Kanemitsu Shingo Kanaji Masashi Yamamoto Tatsuya Imanishi Tetsu Nakamura Satoshi Suzuki kenichi Tanaka Yoshihiro Kakeji Division of Gastrointestinal Surgery department of SURGERY Kobe University Graduate School of Medicine Kobe Japan

Objective: To determine if a subcutaneous closed suction drain decreases the incidence of wound complications in patients undergoing emergency surgery for colorectal perforation. Materials and Methods: Data on 47 patients who underwent emergency operations for colorectal perforation were examined retrospectively. The clinical features of these cases with or without the use of the J-VACTM Drainage System were examined, and statistical analysis was performed. Results: In these high-risk cases, the overall incidence of incisional surgical site infection (SSI) was 36.2%. The incidence of incisional SSI in these cases with and without the J-VACTM Drainage System was 16.7% and 56.5%, respectively. Conclusion: Our results suggest that a subcutaneous closed suction drain is effective for preventing incisional SSI in patients who have undergone emergency operations for colorectal perforation.

关键词： Surgical Wound Infection Intestinal Perforation Closed Suction Drainage Emergency Operation