Telesurgery System with Original-Quality Moving Images over High-Speed Internet: Expansion Within the Asia-Pacific Region

Shimizu, Shuji,Nakashima, Naoki,Okamura, Koji,Han, Ho-Seong,Tanaka, Masao Mary Ann Liebert 2007 Journal of Laparoendoscopic & Advanced Surgical Te Vol.17 No.5

Flexible control of residual stress of (Ti,Al)N films by regulating pulse duration in high power impulse magnetron sputtering

Shuji TAKAHASHI,Tetsuhide SHIMIZU,Yoshikazu TERANISHI,Kazuo MORIKAWA,Ming YANG,Ulf HELMERSSON 한국진공학회 2016 한국진공학회 학술발표회초록집 Vol.2016 No.8

Flux Fabrication of CuInS<SUB>2</SUB> Crystals and Crystal Layers

Kosuke Shimizu,Hajime Wagata,Nobuyuki Zettsu,Shuji Oishi,Katsuya Teshima 한국표면공학회 2013 한국표면공학회 학술발표회 초록집 Vol.2013 No.11

디지털 영상을 이용한 원격 의학 교육

함준수,Shuji Shimizu,Naoki Nakashima,현일식,최호순,고용,이경근,김선일,김태은,윤지원,박용진 대한소화기내시경학회 2006 Clinical Endoscopy Vol.32 No.3

Background/Aims: Telemedicine has opened the door to a wide range of learning experience to the doctors and students working and studying at various remote locations. However, there are limitations to this technology, such as the lack of any approved international standards of ethics. The aim of our study was to establish a telemedical education system using the Digital Video Transfer System (DVTS) on the high-speed network. Methods: The Asia Pacific Information Infrastructure (APII) link was used to connect Korea with Japan, and the Korea Advanced Research Network (KOREN) was used to connect Busan with Seoul. Teleconferencing and video streaming between Hanyang University Hospital in Seoul and Kyushu University Hospital in Japan were realized using DVTS over the Ipv4 network. Results: Four endoscopic surgeries and two endoscopic procedures were successfully transmitted between Seoul and Kyushu, while concomitant teleconferences were taking place between the two cities throughout the operations. An adequate bandwidth of 60 Mbps was kept for two-line transmissions. The quality of transmitted video image showed no frame loss with a rate of 30 images per second. The sound was also clear, and the time delay was less than 0.3 sec. Conclusions: We have established an international medical network with high-quality video transmission over Internet medium and this was easy to perform, reliable and economical. (Korean J Gastrointest Endosc 2006;32:161-167) 목적: 원격진료 시스템은 서로 멀리 떨어진 곳에서도 상대방과 실시간으로 의료정보를 교환할 수 있으므로 의료 종사자에게 폭넓은 배움의 기회를 제공한다. 그러나 현재 사용되는 동영상 화질은 온라인 의학 교육의 목적으로 사용하기에는 속도, 해상도 등의 부족한 부분이 많아 국제적으로 표준화되지 못하고 있다. 따라서 본 연구의 목적은 고속 네트워크 기반에서 고화질 영상의 디지털 영상 전송 시스템을 이용하여 원격 의학 교육 시스템을 확립하는 것이다. 대상 및 방법: 한국과 일본의 연결을 위해 부산과 후쿠오카 사이의 해저 케이블인 아시아-태평양 정보통신 기반구조(asia pacific information infrastructure, APII)를 이용하였고, 서울과 부산은 초고속선도망(Korea advanced research network, KOREN)으로 연결하였다. 서울의 한양대학교병원과 일본의 규슈대학교병원 사이의 원격회의와 실시간 영상 전송은 IPv4 주소시스템을 기반으로 하여 디지털 영상 전송 시스템을 통하여 이루어졌다. 결과: 복강경 담낭 절제 수술, 미세 신경 수술, 내시경역행췌담관조영술 및 소장내시경술 영상이 서울과 규슈 사이에서 성공적으로 전송되었고, 동시에 두 지역 사이에 원격회의가 열렸다. 또한 한국, 미국, 일본의 세 나라 사이에서 실시간 영상 전송을 통한 원격회의를 성공적으로 개최하였다. 양방향 전송을 위해 60 Mbps의 충분한 대역폭이 제공되었으며 전송된 영상은 초당 30장의 속도로 프레임 손실 없이 높은 화질을 보였다. 음성도 깨끗하였으며 전송 지연 시간은 0.3초 미만이었다. 결론: 본 연구는 인터넷 기반의 고화질 영상 전송 시스템을 이용한 국제적 의학 네트워크를 확립하였으며 이러한 네트워크는 시행이 쉽고 또한 경제적이어서 향후 원격의학 교류에 확실한 방법이 될 수 있다.

디지털 영상 전송 시스템을 이용한 원격진료

함준수,Shimizu, Shuji,Nakashima, Naoki,변태준,이항락,최호순,고용,이경근,김선일,김태은,윤지원,박용진 대한소화기학회 2004 대한소화기학회지 Vol.43 No.6

목적: 인터넷에 기초한 기술의 발달이 사회 전 분야의 발전을 가능하게 하였으며 특히 의료 분야의 자동화와 정보화가 이루어졌다. 많은 임상 의사가 원격 교류를 통해서 원격진료가 가능하게 되었으나 아직은 많은 제한점이 있다. 이 연구의 목적은 디지털 영상 전송 시스템을 사용함으로써 고화질의 영상을 가능하게 해 결국 원격진료 교육에 도움을 주고자 시작하였다. 대상 및 방법: 본 프로젝트는 정보통신부 산하 한국전산원의 지원으로 구축된 KJCN,KOREN (Korea advanced research network)의 활용을 위해현해/겐카이 프로젝트의 부프로젝트로 시작되었다. 일본과의 네트워크를 위해 KJCN의 케이블을 부산과 후쿠오카 사이 300 km 거리의 해저에 설치하였으며, 부산과 서울 한양대학교 사이의 약 300 km 거리는 KOREN을 이용하여 연결하였다. 기본적인 장비를 수술실과 세미나실에 설치하여 수술 현황을 세미나실에서 토의할 수 있도록 하였으며, 일본 후쿠오카의 큐슈대학병원과 네트워크를 연결하였다.2003년 2월 12일 최초로 한양대학병원과 일본 큐수대학병원간의 화상회의로 시작하였다. 결과: 수술 영상을 전송하여 의료진들은 각 회의에서 한 시간 또는 두 시간 동안 외과적 과정에 대해 서로 토론했고 이미지의 질은 원본 디지털 영상과 비교하여 차이가 없었고 일반 영상보다 뛰어났다. 수술시 해부 구조를 명확하게 인식할 수 있었고 그 과정도 잘 이해할 수 있었으며 실시간 전송에 이용된 수술은복강경 담낭제거술과 전립선제거술이었다. 이와 같이 인터넷 프로토콜 기반의 DVTS을 이용한 동영상의 전송은 성공리에 진행되었고 환자의 병력과 수술전의 상태 또한 정지 화상으로 볼 수 있었다. 결론: 본 연구는 인터넷을 통해 해외의 고화질의 영상 전송 시스템을 개발하였으며 이 시스템은 경제적이며 시행하기 쉬우므로 향후 원격진료에 유용한 방법이 될 것으로 생각한다. Background/Aims: The growth of technology based on internet protocol has affected on the informatics and automatic controls of medical fields. The aim of this study was to establish the telemedical educational system by developing the high quality image transfer using the DVTS (digital video transmission system) on the high-speed internet network. Methods: Using telemedicine, we were able to send surgical images not only to domestic areas but also to international area. Moreover, we could discuss the condition of surgical procedures in the operation room and seminar room. The Korean-Japan cable network (KJCN) was structured in the submarine between Busan and Fukuoka. On the other hand, the Korea advanced research network (KOREN) was used to connect between Busan and Seoul. To link the image between the Hanyang University Hospital in Seoul and Kyushu University Hospital in Japan, we started teleconference system and recorded image-streaming system with DVTS on the circumstance with IPv4 network. Results: Two operative cases were transmitted successfully. We could keep enough bandwidth of 60 Mbps for two-line transmission. The quality of transmitted moving image had no frame loss with the rate 30 per second. The sound was also clear and the time delay was less than 0.3 sec. Conclusions: Our study has demonstrated the feasibility of domestic and international telemedicine. We have established an international medical network with high-quality video transmission over internet protocol. It is easy to perform, reliable, and also economical. Thus, it will be a promising tool in remote medicine for worldwide telemedical communication in the future. (Korean J Gastroenterol 2004;43:370-375)

한-일간 초고속 연구망을 활용한 복강경 수술 원격 교육 시스템의 구축

김영우,Shuji Shimizu,강철희,염성관,이영석,이재화,Koji Okamura,Naoki Nakashima,Masahiko Kawamoto,Masao Tanaka 대한외과학회 2003 대한외과학회 학술대회 초록집 Vol.2003 No.11

Rapid prediction of 1-year efficacy of tofacitinib for treating refractory ulcerative colitis

( Hiromichi Shimizu ),( Toshimitsu Fujii ),( Shuji Hibiya ),( Maiko Motobayashi ),( Kohei Suzuki ),( Kento Takenaka ),( Eiko Saito ),( Masakazu Nagahori ),( Kazuo Ohtsuka ),( Mamoru Watanabe ) 대한장연구학회 2021 Intestinal Research Vol.19 No.1

Long-term efficacy and safety of tofacitinib in patients with ulcerative colitis: 3-year results from a real-world study

Hiromichi Shimizu,Yuko Aonuma,Shuji Hibiya,Ami Kawamoto,Kento Takenaka,Toshimitsu Fujii,Eiko Saito,Masakazu Nagahori,Kazuo Ohtsuka,Ryuichi Okamoto 대한장연구학회 2024 Intestinal Research Vol.22 No.3

Background/Aims: The efficacy and safety of tofacitinib for the treatment of refractory ulcerative colitis (UC) has been demonstrated in clinical trials. Although, a series of reports with real-world evidence of its short-term efficacy and safety profiles have already been published, reports of long-term real-world data have been limited. We aimed to show our 3-year evidence on the clinical use of tofacitinib for the treatment of UC, focusing on its efficacy and safety profiles. Methods: A retrospective observational study was conducted on patients who started tofacitinib for active refractory UC at our hospital. The primary outcome was the retention rate until 156 weeks after initiating tofacitinib. The secondary outcomes were short-term efficacy at 4, 8, and 12 weeks; long-term efficacy at 52, 104, and 156 weeks; prognostic factors related to the cumulative retention rate; loss of response; and safety profile, including adverse events. Results: Forty-six patients who were able to be monitored for up to 156 weeks after tofacitinib initiation, were enrolled in this study. Continuation of tofacitinib was possible until 156 weeks in 54.3%, with > 50% response rates and > 40% remission rates. Among patients in whom response or remission was achieved and tofacitinib was deescalated after 8 weeks of induction treatment, 54.3% experienced relapse but were successfully rescued by and retained on reinduction treatment, except for 1 patient. No serious AEs were observed in the study. Conclusions: Tofacitinib is effective and safe as long-term treatment in a refractory cohort of UC patients in real-world clinical practice.

Startup Engineering Education Programs in Niigata University: How to Integrate Knowledge to Solve Engineering Problems

Kazuaki Yamagiwa,Yuji Tanabe,Shuji Harada,Tadaaki Shimizu,Tetsuo Oka 한국공학교육학회 2012 공학교육연구 Vol.15 No.5

Faculty of engineering, Niigata University has been executing start-up engineering education programs for the first-year students to educate his or her ability to solve engineering problems. They are divided into teams and tackle a task that they expect to easily accomplish. The expected results are hardly obtained. Then they try to seek the gap between the results and their knowledge. They analyze the phenomena and improve the approach. They evaluate the results of second trial and the effectiveness of the measures. That is, the project requires so-called PDCA cycles for students to solve engineering problems. The start-up engineering project is one of the compulsory subjects and seven departments have given the students several tasks based on their technicality. The students exchange their knowledge, ideas and learn how to use knowledge to solve the problems. Their reports and questionnaire survey proved that the projects are highly effective to improve his or her ability to solve engineering problems and give them strong motivation to learn engineering. We introduce the some tasks and the outcomes of the projects set by seven departments; mechanical and production engineering, electrical and electronic engineering, information engineering, biocybernetics, chemistry and chemical engineering, civil engineering and architecture, and material science and engineering.

Clinical outcomes of sigmoid colon volvulus: identification of the factors associated with successful endoscopic detorsion

( Tomoya Iida ),( Suguru Nakagaki ),( Shuji Satoh ),( Haruo Shimizu ),( Hiroyuki Kaneto ),( Hiroshi Nakase ) 대한장연구학회 2017 Intestinal Research Vol.15 No.2

Background/Aims: Although multiple treatment options exist for the management of sigmoid colon volvulus, no study has examined the factors associated with successful endoscopic detorsion. This study aimed to examine the clinical course of patients with sigmoid colon volvulus and to identify factors related to successful endoscopic detorsion. Methods: This study included 30 cases (21 patients) of sigmoid volvulus from among 545 cases of intestinal obstruction at a single center. We retrospectively examined the clinical course and the factors associated with the possibility of endoscopic detorsion of sigmoid colon volvulus. Results: The rate of laxative use among the study participants was 76.2%; the rate of comorbid neuropsychiatric disorders was 61.9%; and 57.1% of patients had a history of open abdominal surgery. All patients were initially treated with endoscopic detorsion, and this procedure had a 61.9% success rate. The recurrence rate after detorsion was as high as 46.2%, but detorsion during revision endoscopy was possible in all cases. Statistical analysis revealed that the absence of abdominal tenderness (P =0.027), the use of laxatives (P =0.027), and a history of open abdominal surgery (P =0.032) were factors predictive of successful endoscopic detorsion. Conclusions: The results of our study are consistent with previous reports with respect to the success rate of endoscopic detorsion, the subsequent recurrence rate, and the proportion of patients requiring surgical treatment. In addition, we identified the absence of abdominal tenderness, the use of laxatives, and history of open abdominal surgery as factors predicting successful endoscopic detorsion of sigmoid colon volvulus. (Intest Res 2017;15:215-220)