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Search Results: 1 - 10 of 723 matches for " Tatsuya Yuba "
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A Human T Lymphotropic Virus Type 1 Carrier Coinfected with Mycobacterium intracellulare and Pneumocystis jirovecii with a Characteristic Compositional Change of Bone Marrow Cells  [PDF]
Sayaka Uda, Shinsuke Shiotsu, Ayaka Omura, Ryosuke Hamashima, Akihiro Yoshimura, Naoko Kurisu, Tomoya Sagawa, Koichi Hasegawa, Tatsuya Yuba, Chieko Takumi, Seiko Ono, Noriya Hiraoka, Noriya Hiraoka
Open Journal of Respiratory Diseases (OJRD) , 2017, DOI: 10.4236/ojrd.2017.73011
Abstract: Human T lymphotropic virus type 1 (HTLV-1) is endemic in the southern part of Japan. Infection of the virus can cause adult T cell leukemia/lymphoma (ATL), while most infected individuals remain in a carrier state for a long period of time. Although rare cases of carriers, like ATL patients, who developed opportunistic infections, have been reported, hematological changes of carriers who are prone to opportunistic infections have not been well defined. Here, we present a case of an HTLV-1 carrier who developed Mycobacterium intracellulare infection and Pneumocystis jirovecii pneumonia (PcP) simultaneously. Flow cytometric analysis of bone marrow cells revealed an aberrant compositional change similar to that in ATL patients. This suggests the presence of a pre-ATL state prior to the development of ATL, which is notable in terms of underlying cellular immunodeficiency.
Development of an Indonesian Micro Satellite
Yuba, Rakhim
Online Journal of Space Communication , 2005,
Abstract: This article describes the development of a micro satellite conducted by LAPAN (The National Institute of Aeronautics and Space of Indonesia in collaboration with Berlin Technical University (TU-Berlin) which is started in January 2004. LAPAN has been involved in many space projects since its establishment. Among others are the operation of ground stations for satellite remote sensing and GPS for the benefit of national users. While applications of space technologies have been in place for more than 20 years in this country, mastery of these technologies is significantly lagging behind, notably compared with some other Asian nations. Facing that strategic challenge, LAPAN has started to develop an Indonesian Micro Satellite, defined as a satellite with a mass between 50 – 80 kg. The purpose of this satellite will be for remote sensing and e-mail application. In this effort, cooperation with other institutions is a must. The program touches not only on the research efforts, but could and should be linked to other national development issues such as education and manufacturing.
An Integrating Algorithm and Theoretical Analysis for Fully Rheonomous Affine Constraints: Completely Integrable Case  [PDF]
Tatsuya Kai
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.412235

This paper develops an integrating algorithm for fully rheonomous affine constraints and gives theoretical analysis of the algorithm for the completely integrable case. First, some preliminaries on the fully rheonomous affine constraints are shown. Next, an integrating algorithm that calculates independent first integrals is derived. In addition, the existence of an inverse function utilized in the algorithm is investigated. Then, an example is shown in order to evaluate the effectiveness of the proposed method. By using the proposed integrating algorithm, we can easily calculate independent first integrals for given constraints, and hence it can be utilized for various research fields.

On Integrability of Fully Rheonomous Affine Constraints  [PDF]
Tatsuya Kai
International Journal of Modern Nonlinear Theory and Application (IJMNTA) , 2013, DOI: 10.4236/ijmnta.2013.22016

This paper presents a complete integrability condition for fully rheonomous affine constraints in terms of the rheonomous bracket. We first define fully rheonomous affine constraints and develop geometric representation for them. Next, the rheonomous bracket is explained and some properties of it are derived. We then investigate a necessary and sufficient condition on complete integrability for the fully rheonomous affine constraints based on the rheonomous bracket as an extension of Frobenius’ theorem. The effectiveness and the availability of the new results are also evaluated via an example.

Partial Integrability Conditions and an Integrating Algorithm for Fully Rheonomous Affine Constraints  [PDF]
Tatsuya Kai
Circuits and Systems (CS) , 2014, DOI: 10.4236/cs.2014.56015

In this paper, integrability conditions and an integrating algorithm of fully rheonomous affine constraints (FRACs) for the partially integrable case are studied. First, some preliminaries on the FRACs are illustrated. Next, necessary and sufficient conditions on the partially integrable case for the FRACs are derived. Then, an integrating algorithm to calculate independent first integrals of the FRACs for the partially integrable case is derived. Moreover, the existence of an inverse function utilized in the algorithm is proven. After that, an example is presented for evaluation of the effectiveness of the proposed method. As a result, it turns out that the proposed integrating algorithm can easily calculate independent first integrals for given partially integrable FRACs, and thus this new algorithm is expected to be applied to various research fields.

Circular Obstacle Avoidance Control of the Compass-Type Biped Robot Based on a Blending Method of Discrete Mechanics and Nonlinear Optimization  [PDF]
Tatsuya Kai
International Journal of Modern Nonlinear Theory and Application (IJMNTA) , 2015, DOI: 10.4236/ijmnta.2015.43013
Abstract: This paper considers an obstacle avoidance control problem for the compass-type biped robot, especially circular obstacles are dealt with. First, a sufficient condition such that the swing leg does not collide the circular obstacle is derived. Next, an optimal control problem for the discrete compass-type robot is formulated and a solving method of the problem by the sequential quadratic programming is presented in order to calculate a discrete control input. Then, a transformation method that converts a discrete control input into a continuous zero-order hold input via discrete Lagrange-d’ Alembert principle is explained. From the results of numerical simulations, it turns out that obstacle avoidance control for the continuous compass-type robot can be achieved by the proposed method.
A New Efficient Obstacle Avoidance Control Method for Cars Based on Big Data and Just-in-Time Modeling  [PDF]
Tatsuya Kai
Journal of Computer and Communications (JCC) , 2018, DOI: 10.4236/jcc.2018.611002
Abstract: This paper provides a new obstacle avoidance control method for cars based on big data and just-in-time modeling. Just-in-time modeling is a new kind of data-driven control technique in the age of big data and is used in various real systems. The main property of the proposed method is that a gain and a control time which are parameters in the control input to avoid an encountered obstacle are computed from a database which includes a lot of driving data in various situations. Especially, the important advantage of the method is small computation time, and hence it realizes real-time obstacle avoidance control for cars. From some numerical simulations, it is showed that the new control method can make the car avoid various obstacles efficiently in comparison with the previous method.
Gracilis Muscular Flap for Large Urethral Defect  [PDF]
Yuichiro Yoshioka, Shigeaki Moriura, Hiroshi Yuba, Atsushi Hirano, Ryohei Hattori
Surgical Science (SS) , 2011, DOI: 10.4236/ss.2011.29100
Abstract: We report the use of Gracilis muscle to repair a large urethral defect. A 57-year-old-man with rectal cancer underwent abdominoperineal resection including part of the prostate and seminal vesicle. Soon after surgery, he presented with massive urinary leakage from the prostatic urethra. Conservative treatment for one month failed. The defect of the prostatic urethra, measuring 2.5 cm in diameter, was closed with the right gracilis muscular flap. About five years and 6 months after surgery, the patient can void spontaneously without incontinence. Cystoscopy demonstrated good epithelization of the reconstructed urethra without stenosis. The gracilis muscular flap was easily available and useful for closure of a large urethral defect.
Efficacy of the structured life review and the short-term life review on the spiritual well-beingof terminally ill cancer patients  [PDF]
Michiyo Ando, Tatsuya Morita
Health (Health) , 2010, DOI: 10.4236/health.2010.24051
Abstract: GOALS: The aims of this study were to evaluate the treatment efficacy of the structured life review interviews and the Short-Term Life Review on the spiritual well-being of terminally ill cancer patients, in order to improve patients’ quality of life. SUBJECTS and METHODS: Participants were patients in palliative care units in Japan. In the study 1, the structured life review interviews were conducted with 12 patients. They completed the QOL scale of the SELT-M (Skalen zur Erfassung von Lebens qualitat bei Tumor- kranken–Modified Version) questionnaire before and after the interviews. In the study 2, the Short-Term Life Review was conducted with 30 patients. They reviewed their lives in the first session and they confirmed the contents in the album based on the life review in the second session. Duration of the treatment was one week. Measurement instruments included Func- tional Assessment Chronic Illness Therapy- Spiritual (FACIT-Sp). RESULTS: After the structured life review, the mean overall QOL score and Spirituality subscale score of the SELT-M significantly increased, from 2.57 ± 0.61 to 3.58 ± 1.0 (p=0.013) and 2.57 ± 0.61 to 3.14 ± 2.25 (P=0.023), respectively. After the Short-Term Life Review, the mean FACIT-Sp scores significantly increased from 16 ± 8.2 to 24 ± 7.1. CONCLUSION: Both the structured life review and the Short-Term Life Review may be effective in improving the spiritual well-being of terminally ill cancer patients, being higher feasibility for the Short-Term Life Review. We need to use these therapies understanding characteristics of each therapy.
Multidrug Delivery Systems with Single Formulation——Current status and Future Perspective  [PDF]
Tatsuya Okuda, Satoru Kidoaki
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2012, DOI: 10.4236/jbnb.2012.31007
Abstract: Development of new way and system for multidrug delivery has recently attracted much attention and became one of major issue in drug delivery research. Although this research field is still immature compared to the single drug delivery system, intensive efforts have recently been devoted by researchers in order to realize more efficient, functional, and safe combination therapy using multiple drugs or agents. In this review article, we outline several targets in terms of application for biochemical modulation together with various concrete attempts of simultaneous and sequential delivery of multiple drugs or agents with single formulation. Finally, we will also summarize the possible contribution of biomaterial sciences and nanobiotechnology for improvement of future multidrug delivery system.
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