High Speed AD Converter Board System

Masaaki Hatta,Toshiyuki Yamada 대한전자공학회 1987 JTC-CSCC : Joint Technical Conference on Circuits Vol.- No.-

Posterior Ligamentous Complex Injuries Are Related to Fracture Severity and Neurological Damage in Patients with Acute Thoracic and Lumbar Burst Fractures

Masaaki Machino,Yasutsugu Yukawa,Keigo Ito,Shunsuke Kanbara,Daigo Morita,Fumihiko Kato 연세대학교의과대학 2013 Yonsei medical journal Vol.54 No.4

Purpose: The proposed the thoracolumbar injury classification system (TLICS) for thoracolumbar injury cites the integrity of the posterior ligamentous complex (PLC). However, no report has elucidated the severity of damage in thoracic and lumbar injury with classification schemes by presence of the PLC injury. The purpose of this study was to accurately assess the severity of damage in thoracic and lumbar burst fractures with the PLC injuries. Materials and Methods: One hundred consecutive patients treated surgically for thoracic and lumbar burst fractures were enrolled in this study. There were 71 men and 29 women whose mean age was 36 years. Clinical and radiologic data were investigated, and the thoracolumbar injury classification schemes were also evaluated. All patients were divided into two groups (the P group with PLC injuries and the C group without PLC injuries)for comparative examination. Results: Fourth-one of 100 cases showed PLC injuries in MRI study. The load sharing classification score was significantly higher in the P group [7.8±0.2 points for the P group and 6.9±1.1 points for the C group (p<0.001)]. The TLICS (excluded PLC score) score was also significantly higher in the P group [6.2±1.1 points for the P group and 4.0±1.4 points for the C group (p<0.001)]. Conclusion: The presence of PLC injury significantly influenced the severity of damage. In management of thoracic lumbar burst fractures, evaluation of PLC injury is important to accurately assess the severity of damage.

Clinical features of very early-onset inflammatory bowel disease in Japan: a retrospective single-center study

Masaaki Usami,Ichiro Takeuchi,Reiko Kyodo,Yuri Hirano,Kosuke Kashiwagi,Hiroki Fujikawa,Hirotaka Shimizu,Toshinao Kawai,Katsuhiro Arai 대한장연구학회 2022 Intestinal Research Vol.20 No.4

Background/Aims: Very early-onset inflammatory bowel disease (VEO-IBD), defined as IBD diagnosed in patients younger than 6 years, is a challenge for pediatric gastroenterologists. Although there have been reports regarding VEO-IBD in Western countries, those in Asia are still lacking. This study aimed to investigate the clinical features of Japanese VEO-IBD patients.Methods: Patients with VEO-IBD diagnosed between 2006 and 2019 were evaluated retrospectively. The disease phenotypes were classified into ulcerative colitis type (UC-type) and Crohn’s disease type (CD-type), and the clinical features and courses were compared between the phenotypes.Results: Overall, 54 VEO-IBD patients (19 patients with UC-type and 35 patients with CD-type) were evaluated. The median age at onset was 18 months. One patient had severe combined immunodeficiency (SCID), and 9 patients had monogenic IBD. Monogenic IBD was more prevalent in the CD-type patients with perianal disease (CD-type (PD)). The age at onset was significantly lower in the CD-type group (P<0.05). The most common initial symptom was bloody stools (70%), followed by diarrhea (63%), weight loss (24%), fever (20%), and perianal disease (20%). Excluding patients with SCID and monogenic IBD, 23 out of 44 patients (52%) required biologics. The biologics were switched in 11 out of 44 patients (25%), and the majority of these patients (82%) were in the CD-type group. Overall, 9 patients (20%) required intestinal resection or ostomy placement.Conclusions: CD-type tends to occur at an earlier age, and monogenic IBD occurs significantly more frequently in CD-type (PD). Disease severity and treatment should be individualized, owing to the disease heterogeneity.

How to Nurture Students' Study Habits Using a Handy E-learning System with Cell Phones

Masaaki Oki,Shimpei Matsumoto 영상영어교육학회 2011 영상영어교육 (STEM journal) Vol.12 No.1

The interactive e-learning system that this paper outlines is an essential tool for supporting self-study continuity among individual learners. Benkyo-Kun, used in conjunction with an interactive e-mail service through cell-phones, allows users to automatically receive up to ten exercise e-mails a day. Learners are not required to continually access the learning contents for themselves, as in other systems. What's more, after replying to an e-mail, a student's results are instantaneously available, so each user can grasp their own level of achievement, collective ranking, and weak points after checking the Benkyo-Kun website. All users' history and answers are stored in a database. This communal information then contributes to the understanding of class trends and individual learning levels. Benkyo-Kun supports each individual learner by offering a means to study through a convenient and easily accessible system, which targets users whose effective study habits are not yet established.

Implementing Lessons Based on Movie Reviews

Masaaki Oki 영상영어교육학회 2011 영상영어교육 (STEM journal) Vol.12 No.2

There have been numerous recent developments in methods of teaching how to write in English by using movies. However, there are not many papers that deal with showing teachers the actual process of how to get students to write a movie report, and then gauge its effect through feedback from the students. A number of journals have published papers which rank movies based on their degree of English difficulty. However, most of those papers focus on the methodology of how to use a movie, how to get an effective result in the limited time, or how to develop and plan a lesson. The purpose of this paper, rather, is to show teachers how to instruct students to create movie review assignments, not only for those who are good at English, but also for the relatively less motivated students who do not yet have the habit of studying English. This paper will also introduce a method which is fully manageable for both teachers and students by showing first, how to make a report; second, how to evaluate it; and finally, the effectiveness of this method. Furthermore, this paper explains one practical technique in detail, which teachers using movies and multimedia can utilize to develop much more satisfactory lessons that include a questionnaire and cover a variety of graphic content.

Large Amplitude Oscillation of Air Column in a Closed Duct with Varying Cross-Sectional Area

Masaaki Kawahashi,Takashi Kondo,Hiroyuki Hirahara 대한기계학회 1998 KSME/JSME THERMAL and FLUID Engineering Conference Vol.1 No.1

Teacher-made Visual Aids and ARCS Theory

Masaaki Oki 영상영어교육학회 2013 영상영어교육 (STEM journal) Vol.14 No.2

It is becoming difficult for English teachers to teach using only printed matter such as a textbook; therefore, they often use visual aids such as DVDs, which are sometimes included with an English textbook. Moreover, students are accustomed to such visual aids in an English class. However, the DVDs packaged with a textbook may not enhance the presentation of lessons. This study, based on the pedagogical perspective of John Keller's ARCS theory, focuses on the development of an original visual aid that helps students understand the material and explains the essence of a movie that teachers wish to show their students. Using an original DVD as an aid allows teachers to tailor the content of these materials on the basis of their instructional needs. These aids are accessible, allowing learners to experience content traditionally presented in textbooks and movies. In addition, depending on how the teacher creates or uses the aid, it can save time by concisely presenting only the relevant points in a lesson. Visual aids created by teachers are rare in English lessons. This study of these teaching materials leads us to more progressive and informative multimedia teaching methods.

Direct-multicasting Satellite Communications System

Masaaki, Tabata,Toshihiro, Tsuchida,Hiroshi, Kazama 통신위성우주산업연구회 2004 Joint Conference on Satellite Communications Vol.2004 No.-

Satellite communications is a promising medium for multicasting services such as streaming media delivery. However, most of the current satellite multicasting systems use a star-type network with one transmitting earth station called a bub, which is generally located in an urban area. Therefore, it is difficult for small businesses located in rural areas to send their contents by using satellite multicasting network. To meet these demands, we developed the direct-multicasting satellite communications system (DMSCS), which can provides a full-mesh type satellite network easily and cost-effectively. DMSCS uses our newly developed multi-carrier/multi-rate modem called the group modem and a highly effective channel assignment control program. The group modem is an FDMA (Frequency Division Multiple Access) modem. It is composed of a control module, user interface modules, a multi-carrier/multi-rate modem (MCMRM) module, and IF up/down-converter module. Its features include simultaneous connections with 32 different points, communication at an arbitrary rate, and the use of a dispersed and discontinuous spectrum. The highly effective channel assignment control program is the operation program for DMSCS. It has scale flexibility and high functionality. This paper described the features of DMSCS, the architecture and performance evaluation of the group modem, and example of new services making the best use of the advantages of DMSCS.

Visualization and Measurement of Thermal Convection Flow in a Closed Duct Combined with Acoustic Standing Wave

Masaaki Kawahashi,Kenji Nishino,Hiroyuki Hirahara 대한기계학회 1998 KSME/JSME THERMAL and FLUID Engineering Conference Vol.1 No.1

Navigation Strategy for a Quadruped Robot on Soft Flat Ground

Masaaki Ikeda,Kiyotaka Izumi,Keigo Watanabe 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10

Tasks important for a mobile robot are the environmental recognition and the obstacle avoidance in the real world. The legged robot can be adapted for rough terrains. It is because the legged robot has a high degree of freedom in order to avoid an obstacle to three dimensions. In this paper, we propose a locomotion strategy on the terrain with stiffness which is different in each. The propriety of a continuation walk is determined by the force sensor mounted to the bottom of each leg of a quadruped robot. The effectiveness of the proposal approach is verified from the result of the experiment which uses the prevalent quadruped robot called TITAN-VIII.