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Yuya Omine,Nobuyuki Hinata,Masahito Yamamoto,Masaaki Kasahara,Satoru Matsunaga,Gen Murakami,Shin-ichi Abe 대한해부학회 2015 Anatomy & Cell Biology Vol.48 No.3
To provide a better understanding of the local immune system in the face and external genitalia, i.e., the oral floor, lower lip, palpebral conjunctiva, anus and penis, we examined the distribution and density of CD1a-positve Langerhans cells, CD8-positive suppressor T lymphocytes and CD68-positive macrophages using specimens from 8 male elderly cadavers. The density of Langerhans cells showed an individual difference of more than (or almost) 10-fold in the lip (oral floor). In the oral floor, Langerhans cells were often spherical. Submucosal or subcutaneous suppressor lymphocytes, especially rich in the oral floor and penile skin, migrated into the epithelium at 4 sites, except for the anus. In the conjunctiva, macrophage migration into the epithelium was seen in all 8 specimens. The density of suppressor lymphocytes showed a significant correlation between the oral floor and the lip (r=0.78). In contrast, the anal and penile skins showed no positive correlation in the density of all three types of immunoreactive cells examined. Overall, irrespective of the wide individual differences, the oral floor and conjunctiva seemed to be characterized by a rich content of all three cell types, whereas the penile skin was characterized by an abundance of suppressor lymphocytes. Based on the tables, as mean value, the relative abundance of three different cell types were as follows; CD1a-positive Langerhans cells (anus), CD8-positive lymphocytes (penis), and CD68-positive macrophages (lip). The present observations suggest that the local immune response is highly site-dependent, with a tendency for tolerance rather than rejection.
Robust Observer Design for an Isolated Power System with Model Uncertainty using H∞-Norm
Tomonori Goya,Eitaro Omine,Atsushi Yona,Naomitsu Urasaki,Toshihisa Funabashi,Tomonobu Senjyu 전력전자학회 2010 JOURNAL OF POWER ELECTRONICS Vol.10 No.5
The output power fluctuations of renewable energy power plants such as wind turbine generators and photovoltaic systems result in frequency deviations and terminal voltage fluctuations. Furthermore, these power fluctuations also affect the turbine shaftings of diesel generators and gas-turbine generators which are the main power generation systems on isolated islands. Therefore, it is important to achieve torsional torque suppression. Since the measurement of torsional torque is technically difficult, and there is an uncertainty in the mechanical constants of the shaft torsional system. This paper presents an estimation system that estimates torsional torque by using a developed H∞ observer. In addition to the above functions, the proposed shaft torque observer incorporates a parameter identification system that aims to improve the estimation accuracy. The simulation results validate the effectiveness of the proposed H∞ observer and the parameter identification.
Robust Observer Design for an Isolated Power System with Model Uncertainty using H<sub>∞</sub>-Norm
Goya, Tomonori,Senjyu, Tomonobu,Omine, Eitaro,Yona, Atsushi,Urasaki, Naomitsu,Funabashi, Toshihisa The Korean Institute of Power Electronics 2010 JOURNAL OF POWER ELECTRONICS Vol.10 No.5
The output power fluctuations of renewable energy power plants such as wind turbine generators and photovoltaic systems result in frequency deviations and terminal voltage fluctuations. Furthermore, these power fluctuations also affect the turbine shaftings of diesel generators and gas-turbine generators which are the main power generation systems on isolated islands. Therefore, it is important to achieve torsional torque suppression. Since the measurement of torsional torque is technically difficult, and there is an uncertainty in the mechanical constants of the shaft torsional system. This paper presents an estimation system that estimates torsional torque by using a developed $H_{\infty}$ observer. In addition to the above functions, the proposed shaft torque observer incorporates a parameter identification system that aims to improve the estimation accuracy. The simulation results validate the effectiveness of the proposed $H_{\infty}$ observer and the parameter identification.
Robust Observer Design for an Isolated Power System with Model Uncertainty using H<SUB>∞</SUB>-Norm
Tomonori Goya,Tomonobu Senjyu,Eitaro Omine,Atsushi Yona,Naomitsu Urasaki,Toshihisa Funabashi 전력전자학회 2010 JOURNAL OF POWER ELECTRONICS Vol.10 No.5
The output power fluctuations of renewable energy power plants such as wind turbine generators and photovoltaic systems result in frequency deviations and terminal voltage fluctuations. Furthermore, these power fluctuations also affect the turbine shaftings of diesel generators and gas-turbine generators which are the main power generation systems on isolated islands. Therefore, it is important to achieve torsional torque suppression. Since the measurement of torsional torque is technically difficult, and there is an uncertainty in the mechanical constants of the shaft torsional system. This paper presents an estimation system that estimates torsional torque by using a developed H∞ observer. In addition to the above functions, the proposed shaft torque observer incorporates a parameter identification system that aims to improve the estimation accuracy. The simulation results validate the effectiveness of the proposed H∞ observer and the parameter identification.
Hideaki Kinoshita,Takashi Umezawa,Yuya Omine,Masaaki Kasahara,José,Francisco Rodrí,guez-Vá,zquez,Gen Murakami,Shinichi Abe 대한해부학회 2013 Anatomy & Cell Biology Vol.46 No.1
There is little or no information about the distribution of elastic fibers in the human fetal head. We examined this issue in 15 late-stage fetuses (crown-rump length, 220–320 mm) using aldehyde-fuchsin and elastica-Masson staining, and we used the arterial wall elastic laminae and external ear cartilages as positive staining controls. The posterior pharyngeal wall, as well as the ligaments connecting the laryngeal cartilages, contained abundant elastic fibers. In contrast with the sphenomandibular ligament and the temporomandibular joint disk, in which elastic fibers were partly present, the discomalleolar ligament and the fascial structures around the pterygoid muscles did not have any elastic fibers. In addition, the posterior marginal fascia of the prestyloid space did contain such fibers. Notably, in the middle ear, elastic fibers accumulated along the tendons of the tensor tympani and stapedius muscles and in the joint capsules of the ear ossicle articulations. Elastic fibers were not seen in any other muscle tendons or vertebral facet capsules in the head and neck. Despite being composed of smooth muscle, the orbitalis muscle did not contain any elastic fibers. The elastic fibers in the sphenomandibular ligament seemed to correspond to an intermediate step of development between Meckel’s cartilage and the final ligament. Overall, there seemed to be a mini-version of elastic fiber distribution compared to that in adults and a different specific developmental pattern of connective tissues. The latter morphology might be a result of an adaptation to hypoxic conditions during development.
Proposed Analytical Solution for Estimating of Ultimate Lateral Capacity of Piles in Sandy Soils
Fawzyawad Allah,Noriyuki Yasufuku,Kiyoshi Omine 한국지반공학회 2011 international journal of geo-engineering Vol.3 No.4
This paper presents an approximate analytic solution for the problem of laterally loaded piles in a homogeneous cohesionless soil. A simple method has been introduced for estimating ultimate horizontal resistance (including net frontal earth pressure and side shear resistance) to piles in sandy soil. The differential equation of the problem of a single laterally loaded pile has been formulated based on beam on elastic foundation technique (Winker`s model), and a perfectly plastic soil response was assumed to represent the behavior of soil medium during horizontal loading of a pile. Moreover, a comparison study was carried out between a new proposed approach for predicting the ultimate lateral resistanceand those widely used methods, including: Prasad and Chari (1999), Verruijt (1995), and Broms (1964). Twenty case studies of experimental tests on model of single pile conducted by the authors and collected from the literature were used in this comparison. The calculated values of ultimate horizontal loads by using the new approach agree well with those obtained from the experimental tests with average error of -13.10% while other methods gave significantly higher average errors. Furthermore, to evaluate the accuracy and predictability of the proposed method, a statistical analysis study has been performed using four statistical criteria. The outcomes indicate that this new proposed method yields remarkably satisfactory results.
Application of Cavity Expansion Theory for Evaluating Skin Friction of Tapered Piles in Sands
Suman Manandhar,Noriyuki Yasufuku,Kiyoshi Omine 한국지반공학회 2012 international journal of geo-engineering Vol.4 No.3
This paper discusses the effects of tapered pile penetration in sandy soils after having obtained evidence of its merits over straight-sided cylindrical piles in evaluating skin friction. Experimental model tests confirmed that a slight increase in the angle of tapering also led to a major increase in skin friction. Based on this evidence, the authors adopted an analytical solution to evaluate the skin friction of tapered piles, The cylindrical cavity expansion theory is an appropriate analytical closed-form solution in determining the skin friction of tapered piles at different phases of soils at different relative densities, A new arrangement was inserted by introducing a stress-dilatancy relationship in the ideal elastic-plastic model of cavity expansion application, n general. for easy computation, he angle of internal friction or dilatancy angle is assumed to he constant to compute the skin friction. This drawback was improved upon and both properties considered in evaluating skin friction at each depth iteratively. This paper assesses the results of paranietric studies on different types of model tests, prototype tests and real type pile tests in order to predict the proposed model. The proposed extended model validates the determination of skin friction using a stress-dilatancy relationship.
강민석 ( Omin-seok Kang ),박지원 ( Ji-won Park ),김명규 ( Myung-kyu Kim ),강민섭 ( Min-sup Kang ) 한국정보처리학회 2011 한국정보처리학회 학술대회논문집 Vol.18 No.2
본 논문에서는 대기전력 절감을 위한 서버/클라이언트의 설계 및 구현에 대하여 기술한다. 구현된 시스템은 Server를 통해서 Client의 전력에 대한 통제를 하고, 전력 사용량에 대한 내용을 사용자가 인식할 수 있으며, 사용자가 없을 경우 자동으로 Client의 전원을 차단시키고 스마트폰 등의 외부 네트워크에서 전체시스템 제어가 가능하게 함으로써 기존의 전자기기 대기전력의 소비를 줄일 수 있다. 실험결과를 통해 시스템을 이용함으로써 대기전력 소비가 종전의 29.3%로 낮아짐을 확인할 수 있었다. Server는 ARM과 C#, Client는 ATmega와 C, 외부 접속은 PC와 안드로이드, Java를 이용하여 구현하였다.
Zigbee를 이용하여 대기전력 절감을 위한 스마트 오피스 시스템의 설계 및 구현
강민석 ( Omin-seok Kang ),박지원 ( Ji-won Park ),김명규 ( Myung-kyu Kim ),김신우 ( Shin-woo Kim ),장태민 ( Tae-min Jang ),박상조 ( Sang-jo Park ),강민섭 ( Min-sup Kang ) 한국정보처리학회 2011 한국정보처리학회 학술대회논문집 Vol.18 No.1
본 논문에서는 Zigbee 통신을 이용하여 대기전력을 차단함 함으로써 전력 소비를 줄이기 위한 스마트 오피스 시스템의 설계 및 구현에 관하여 기술한다. 구현된 시스템은 Server를 통하여 각 Client의 전류에 대한 통제를 가능하게 하며, 전력 사용 상황과 전력량 정보를 통해 사용자에게 고지함으로써 기존의 전자기기의 대기전력의 소비를 줄일 수 있다. 또한 외부 장치에서 Server로의 접근을 통해 제어할 수 있도록 하여 공간적인 문제도 고려하였다. 실험 결과를 통해 시스템을 이용함으로써 대기전력 소비가 종전보다 작아짐을 확인 할 수 있었다. Server는 ARM과 C#, Client는 ATmega와 C를 이용하여 구현하였다.