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Three-dimensional computed tomography in laparoscopic surgery for coiorectal carcinoma

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World Journal of Gastroenterology 2005年第44期11卷 6932-6935页

作者： Hiroshi ohtani Kohei ohta Yuichi Arimoto Eui-Chul Kim Hiroko Oba Kenji Adachi Shoichi Terakawa Mitsuo Tsubakimoto Department of Surgery Department of Gastroenterology Department of Radiology

AIM： To evaluate the usefulness of three-dimensional computed tomography （3DCT） in laparoscopic surgery for colorectal carcinoma. METHODS： Seventy-two patients with colorectal cancer who underwent curative operation at our hospital were enrolled in this study. They were classified into two groups by operative procedures. Sixteen patients underwent laparoscopic surgery, laparoscopic group （LG）, while 56 patients underwent conventional open surgery, open group （OG）. At our institution, contrast-enhanced CT is routinely performed as part of intra-abdominal screening and the 3D images of the major regional vessels are described. We have previously described about the preoperative visualization of the inferior mesenteric artery （IMA） by 3DCT. This time we newly acquired 3D images of the superior mesenteric artery （SMA）/superior mesenteric vein （SMV）, ileocecal artery （ICA）, middle colic artery （MCA）, and inferior mesenteric vein （IMV）. We have compared our two study groups with regard to five items, including clinical anastomotic leakage. We have discussed here the role of 3DCT in laparoscopic surgery for colorectal carcinoma. RESULTS： The mean length of the incision in LG was 4.6254-0.89 cm, which was significantly shorter than that in OG （P〈0.001）. The association between ICA and SMV and SMA was described in the right-sided colectomy. The preoperative imaging of IMA and IMV was created in the rectosigmoidectomy. There was no significant difference in anastomotic leakage between the two groups, but no patients in LG experienced anastomotic leakage.CONCLUSION： Most of the patients are satisfied with the shorter incisional length following laparoscopic surgery. Preoperative visualization of the major regional vessels may be helpful for the secure treatment of the anastomosis in laparoscopic surgery for colorectal carcinoma.

关键词： Three-dimensional computed tomography Laparoscopic colorectal surgery, Colorectal cancer

Review: Prediction of Unexpected Fluid-Induced Vibration in Pipeline Network

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World Journal of Mechanics 2022年第2期12卷 17-40页

作者： Ryuhei Yamaguchi Makoto ohta Institute of Fluid Science Tohoku University Sendai Japan

This review considers unexpected destructive disasters involving fluid power plants, such as nuclear electric power plants and fluid power plants. It specifically addresses the possibility of fluid vibration induced in a pipeline network of such a plant. The authors investigate the flow oscillation induced within a T-junction for laminar steady flow at a Reynolds number less than 103 and clarify that there is a periodic fluid oscillation with a constant Strouhal number independent of several flow conditions. Generally, a nuclear electric power plant is constructed using straight pipes, elbows, and T-junctions. Indeed, a T-Junction is a basic fluid element of a pipeline network. The flow in a fluid power plant is turbulent. There are peculiar flow phenomena that occur at high Reynolds numbers, which are also seen in other flow situations;e.g., Kaman vortices are observed around a circular cylinder in low Reynolds numbers, around structures like bridges and downstream of islands in oceans. Although the flow situation of a T-junction and elbow in a fluid power plant, such as the fluid suddenly changing its flow direction is turbulent flow, the authors mention the possibility of the fluid-induced vibration of a pipeline network.

关键词： Fluid-Induced Vibration Flow Oscillation Tube Flow Laminar Steady Flow Fluid Power Plant

Background-Free Optical Sampling System Using Si Avalanche Photodiode as Two-Photon Absorber

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光学学报 2003年第S1期23卷 587-588页

作者： Kenji Taira Ryo ohta Yasuyuki Ozeki Yutaka Fukuchi Kazuhiro Katoh Kazuro Kikuchi Optical Device Laboratory Research Center for Advanced Science and Technology University of Tokyo 4-6-1 Komaba Meguro-Ku Tokyo 153-8904 JapanOptical Device Laboratory Research Center for Advanced Science and Technology University of Tokyo 4-6-1 Komaba Meguro-Ku Tokyo 153-8904 JapanOptical Device Laboratory Research Center for Advanced Science and Technology University of Tokyo 4-6-1 Komaba Meguro-Ku Tokyo 153-8904 JapanOptical Device Laboratory Research Center for Advanced Science and Technology University of Tokyo 4-6-1 Komaba Meguro-Ku Tokyo 153-8904 JapanOptical Device Laboratory Research Center for Advanced Science and Technology University of Tokyo 4-6-1 Komaba Meguro-Ku Tokyo 153-8904 JapanOptical Device Laboratory Research Center for Advanced Science and Technology University of Tokyo 4-6-1 Komaba Meguro-Ku Tokyo 153-8904 Japan

The introduction of a double-chopping scheme eliminates the background level in the optical sampling system, where a Si avalanche photodiode acts as a two-photon absorber. We successfully demonstrate background-free o... 详细信息

关键词： APD of for in as TPA Background-Free Optical Sampling System Using Si Avalanche Photodiode as Two-Photon Absorber EAM GHz test were dBm rate MLL

Metacognition in Solving Process of Basic Electric Circuit ProblemmComparison of Metacognitive Characteristics between Non-major and Major Students in Electric Engineering

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Computer Technology and Application 2013年第8期4卷 415-423页

作者： Atsuo Murata Yukio ohta Graduate School of Natural Science and Technology Okayama University Okayama 700-8530 Japan

There are learners who cannot solve practical problems in spite of mastering basic scientific knowledge and formula necessary for the solution. One of the reasons might be attributed to the lack in metacognitive abilities. The aim of this study was to compare the metacognitive characteristics between non-major and major students in electric engineering and clarify the difference of metacognitive process between these two groups when solving basic problems of electronic circuit. In the experiment, the solving process was compared between non-major and major students in electric engineering using five basic problems. We found that the scores on prediction of result and confidence of own answer differed significantly between non-major and major students, and inferred that the difference of performance was due to the lack in metacognitive ability, especially the plan and the execution abilities. Both prediction of results and confidence of own answer were also found to play a significant role in effective problem solving as important components （subsystems） of metacognition.

关键词： Metacognition plan execution prediction of result confidence of answer major and non-major in electric engineering.

Role of Metacognition in Mathematical Problem Solving Process of Permutations and Combinations--Basic Study for CAI Software Development

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Computer Technology and Application 2013年第6期4卷 296-306页

作者： Atsuo Murata Yukio ohta Department of lntelligent Mechanical Systems Division of Industrial Innovation Sciences Graduate School of Natural Science andTechnology Okayama University Okayama 700-8530 Japan

When solving a mathematical problem, we sometimes encounter a situation where we can not reach a correct answer in spite of acquiring knowledge and formula necessary for the solution. The reason can be attributed to the lack in metacognitive abilities. Metacognitive abilities consist of comparing the difficulty of problem with own ability, proper plan of solution process, and conscious monitoring and control of solution process. The role and importance of metacognitive ability in mathematical problem solving of permutations and combinations was explored. Participants were required to solve five practical problems related to permutations and combinations. For each problem, the solution process was divided into：（1） understanding （recognition） of mathematical problem; （2） plan of solution; （3） execution of solution. Participants were also required to rate the anticipation whether they could solve it or not, and to rate the confidence of their own answer. According to the total score of five problems, the participants were categorized into the group of the high test score and the group of the low test score. As a result, at the plan and the execution processes, statistically significant differences were detected between the high and the low score groups. As for the rating on the anticipation of result and the confidence of own answer, no significant differences were found between both groups. Moreover, the relationship between the score of plan process and the score of execution process was statistically correlated. In other words, the more proper the plan process was conducted, the more proper solution the participants reached. In such a way, the importance of metacognitive ability in the solving process, especially the plan ability, was suggested.

关键词： Permutation and combination problem metacognition understanding plan execution CAI (computer assistedinstruction).

精确测量的地幔体波走时及地幔非均匀性的强度(英文)

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地学前缘 2006年第2期13卷 37-47页

作者： Akira YAMADA Yuhei ohta Geodynamics Research Center Ehi me University Matsuyama790-8577 Japan

用波形相关法精确地测定了在世界各地发生的87个6级以上地震的P波, PP波和Pdiff波的503个走时数据。记录这些地震波形的是新建于西太平洋地区的海洋半球地震观测网。我们利用这些高精度的走时数据研究了地幔体波的走时残差的范围及地幔... 详细信息

用波形相关法精确地测定了在世界各地发生的87个6级以上地震的P波, PP波和Pdiff波的503个走时数据。记录这些地震波形的是新建于西太平洋地区的海洋半球地震观测网。我们利用这些高精度的走时数据研究了地幔体波的走时残差的范围及地幔非均匀性的强度。结果表明,P波、PP波和Pdiff波的走时残差最大分别为9 s ,11 s和15 s ,这为地幔层析成像反演中应该使用的体波走时残差数据的范围提供了重要信息。超出这一范围的走时残差数据不应该用于反演中,以免歪曲成像结果。我们发现,当震中距小于40°时,P波走时残差的范围为-6到+9 s。而对于40°到99°之间的震中距,P波走时残差的范围为-3到+5s。由于震中距越大,P波穿透地幔越深,我们这一结果提供了直接和确凿的证据,表明上地幔和地幔转换带中的横向非均匀性的强度要远胜于下地幔。我们精确测量的Pdiff波的走时数据表明,在地幔底部存在显著的低速异常,可能与地幔热柱或者超级地幔柱有关。我们使用了一个最新的三维全球层析成像模型来解释这些体波走时数据的空间变化。

关键词：地幔体波地震层析成像地幔非均匀性地幔热柱俯冲板片

Benefit of laparoscopic liver resection in high body mass index patients

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World Journal of Gastroenterology 2016年第10期22卷 3015-3022页

作者： Hiroki Uchida Yukio Iwashita Kunihiro Saga Hiroomi Takayama Kiminori Watanabe Yuichi Endo Kazuhiro Yada Masayuki ohta Masafumi Inomata Department of Gastroenterological and Pediatric Surgery Oita University Faculty of Medicine

AIM: To explore the impact of body mass index(BMI) on surgical outcomes in patients undergoing laparoscopic liver resection(LLR).METHODS: From January 2010 to February 2015, sixty-eight patients who underwent primary partial liver resection in our institute were retrospectively reviewed. Surgical outcomes of LLR were compared with those of open liver resection(OLR). In addition, we analyzed associations with BMI and surgical ***: Among 68 patients, thirty-nine patients underwent LLR and 29 were performed OLR. Significant difference in operation time, blood loss, and postoperative hospital stay was observed. There were no signi ficant di fferences in mortali ty and morbidity in two groups. Twenty-two patients(32.4%) were classified as obese(BMI ≥ 25). A statistically significant correlation was observed between BMI and operation time, between BMI and blood loss in OLR, but not in LLR. The operation time and blood loss of OLR were significantly higher than that of LLR in obese patients. Open liver resection and BMI were independent predictors for prolonged operation time and increased blood loss in multivariate ***: The present study demonstrated that BMI had influenced to surgical outcomes of OLR. LLR was less influenced by BMI and had great benefit in obese patients.

关键词： Laparoscopic liver resection Obesity Body mass index Prolonged operation time Increased blood loss

喹诺酮类抗菌剂N_1取代基的三维结构活性关系和受体图形

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国外医药（抗生素分册） 1992年第6期13卷 441-449页

作者： ohta M 苗华

氟哌酸(NFLX.1)的发现不仅对于喹诺酮类抗菌剂本身,而且对口服抗感染药物,都开创了一个新的时代。它的出现极大地推动了喹诺酮类抗菌药物在临床上的应用。随着它的发现,又相继出现了许多包括其生物等配体(bioisostor)如氟啶酸(2)等的有... 详细信息

氟哌酸(NFLX.1)的发现不仅对于喹诺酮类抗菌剂本身,而且对口服抗感染药物,都开创了一个新的时代。它的出现极大地推动了喹诺酮类抗菌药物在临床上的应用。随着它的发现,又相继出现了许多包括其生物等配体(bioisostor)如氟啶酸(2)等的有关化合物,有不少已经上市(表一)。Koga等以前对结构如通式3的71个化合物进行了QSAR研究。

关键词：喹诺酮类受体图形抗感染药

Improved survival for hepatocellular carcinoma with portal vein tumor thrombosis treated by intra-arterial chemotherapy combining etoposide,carboplatin,epirubicin and pharmacokinetic modulating chemotherapy by 5-FU and enteric-coated tegafur/uracil:A pilo

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World Journal of Gastroenterology 2007年第41期13卷 5465-5470页

作者： Toru Ishikawa Michitaka Imai Hiroteru Kamimura Atsunori Tsuchiya Tadayuki Togashi Kouji Watanabe Kei-ichi Seki Hironobu ohta Toshiaki Yoshida Tomoteru Kamimura Department of Gastroenterology and Hepatology Saiseikai Niigata Second HospitalNiigata 950-1104Japan

AIM： To investigate the poor prognosis of HCC with PVTT, we evaluated the efficacy by a new combination chemotherapy for advanced hepatocellular carcinoma （HCC） with portal vein tumor thrombus （PVTT）. METHODS： From 2002 to 2007, a total of 10 consecutive patients with Stage IVA HCC accompanied by PVTT were studied prospectively to examine the efficacy of treatment by intra-arterial infusion of a chemotherapeutic agents consisting of etoposide, carboplatin, epirubicin and pharmacokinetic modulating chemotherapy by 5-FU and enteric-coated tegafur/uracil. RESULTS： The mean course of chemotherapy was 14.4 （range, 9-21） too. One patient showed complete response （CR） with disappearance of HCC and PVI-F after treatment, and the two patients showed partial response （PR）, response rate （CR ＋ PR/All cases 30%）. The median survival time after the therapy was 457.2 d. The one-year survival rate was 70%. Adverse reactions were tolerable.CONCLUSION： Although the prognosis of most patients with Stage IVA HCC by PVTT is poor, our combination chemotherapy may induces long-term survival and is an effective treatment and produced anti-tumor activity with tolerable adverse effects in patients for advanced Stage IVA HCC accompanied by PVTT.

关键词： Hepatocellular carcinoma Portal vein tumor thrombus Intra-arterial regional chemotherapy