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Yu Sakai,Makito Inoue,Takashi Yoshimi 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
It’s necessary to recover quickly after disasters occur. However, the workers can’t work in seriously damaged area because there is a possibility of secondary disaster. Therefore, the remote controlled construction machines are used to restore the damaged area. But now, the operator of these machines needs to be helped by a person who operates camera. The camera is manually operated by the operator. So, there is a problem that some persons are assigned to the camera operators and a difference in work efficiency is caused depending on their skill level. In order to solve this problem, we are developing an automatic tracking camera control system for construction machine operators by using image processing. It works well like manual camera operation. However, the reproduction of the skilled camera operation is still not enough. Therefore, we aimed to improve the system. In this paper, to improve the system, we recognized the moving direction of the construction machine from the image by image processing. In addition, using this recognition results, we improved the system to display more suitable image to machine operator according to the recognized moving direction.
Fabrication of Functional Cell Sheets with Human Thyrocytes from Non-Tumorous Thyroid Tissue
Yu Huang,Kosho Yamanouchi,Yusuke Sakai,Sayaka Kuba,Chika Sakimura,Michi Morita,Kengo Kanetaka,Mitsuhisa Takatsuki,Susumu Eguchi 한국조직공학과 재생의학회 2019 조직공학과 재생의학 Vol.16 No.6
BACKGROUND: Engineered cell sheet transplantation has been considered an alternative physiological therapy for endocrine disorders. In this study, we attempted to fabricate functional human thyroid cell sheets using the engineering technology by culturing primary thyrocytes in free-feeder monolayers and assessed their proliferation and function in two different media. METHODS: The non-tumorous tissues (approximately 2 g) were dissected during surgery. Primary human thyroid cells were isolated by mechanical dispersion and treatment with isolation solution. The cells were cultured on tissue culture dishes or temperature-responsive culture dishes to induce the formation of detached cell sheets. RESULTS: Primary thyroid cells isolated from nine patients were positive for thyroid transcription factor 1, thyroglobulin (TG) and cytokeratin 7. Cell sheets with follicles were fabricated by cells incubated in both Dulbecco’s Modified Eagle Medium (DMEM) and hepatocyte-defined medium (HDM) culture medium. The diameter and thickness of sheets fabricated in HDM were larger and thicker than those fabricated from DMEM. Furthermore, the cells incubated in HDM secreted higher levels of fT3 and fT4 than those incubated in DMEM. The thyroid peroxidase and TG mRNA of cells maintained in HDM were higher than those in cells maintained in DMEM. CONCLUSION: HDM appears suitable as a culture medium for maintaining primary thyrocytes and fabricating functional cell sheets. These in vitro findings may contribute to the development of appropriate culture conditions for human thyrocytes as well as engineered functional cell sheets.
Magnetism of SrM3P4O14 (M2+ = 3d Ions) Investigated Using Neutron-scattering Measurements
Masashi Hase,Andreas D¨onni,Osamu Sakai,Kiyoshi Ozawa,Hideaki Kitazawa,Vladimir Yu. Pomjakushin,Lukas Keller,Tao Yang,Rihong Cong,Jianhua Lin 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The substances SrM3P4O14 (M = Mn, Fe, Co or Ni) have the same crystal structure. However,the magnetism of SrMn3P4O14 differs qualitatively from that of the other substances. We determinedthe magnetic structures of SrM3P4O14 (M = Mn or Co) by using neutron powder diffractionmeasurements. The spin system in SrMn3P4O14 can be regarded as a trimerized spin chain, whichis consistent with the spin system inferred from the crystal structure and the appearance of the 1/3quantum magnetization plateau. The spin system in SrCo3P4O14 is not a trimerized spin chain.
인공 태양열 집광장치를 이용한 Fe-CeO₂ 전이금속 화합물이 코팅된 세라믹 금속 산화물 반응체의 열화학 이단계 물분해 싸이클 및 수소 생산의 실험적 연구
조현석(Hyun-Seok Cho),사카이 유(Yu Sakai),고다마 타츠야(Tatsuya Kodama) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.4
A newly developed Fe-CeO₂-coated ceramic-foam device has been designed, fabricated, and tested for higher oxygen/hydrogen productivity in the thermochemical two-step water-splitting cycle. For the fabrication of the Fe-CeO₂-coated ceramic-foam device, the direct depositing method was adopted. This method, in which elemental Fe is doped into CeO₂ and this is coated onto the ceramic foam matrix surface, has advantages for the fabrication of reactive foam devices. In the synthesis of Fe-CeO₂, the degree of Fe doping was set at 10, 15, or 30 ㏖%, and the amount of Fe-CeO₂ loaded onto the foam matrix surface was fixed at 30 wt%. A 3㎾th sun-simulator was used as the heat source in the thermochemical two-step water-splitting cycle for hydrogen production. The thermal reduction step for releasing oxygen was conducted at an operating temperature of 1400℃ for 45 minutes, and the subsequent water-decomposition step for producing hydrogen was carried out at 1200℃ for 60 minutes. The performance of the newly developed Fe-CeO₂ foam device was compared with that of previously tested foam devices fabricated by the co-precipitation method and the spin-coating method.
Yong Hwan Lee,Hee Kyung Chung,Kiyoshi Sakai,Naomi Hisanaga,Young Hyun Chung,Jeong Hee Han,Li Je Yu 한국독성학회 2001 Toxicological Research Vol.17 No.3
A patient, 58 years of age, with suspected 0/1 pneumoconiosis since 1993, complained of a dry cough and exertioning dyspnea for 6 months. He had worked in an asbestos company for more than 20 years from 1974. He was subsequently diagnosed with an interstitial lung disease during an annual special health check-up for asbestos workers. A chest X-ray showed an interstitial lung disease and high-resolution computed tomography (HRCT) showed a round opaque asbestosis with chronic hypersensitivity pneumonitis. A pulmonary function test indicated that the patient had a mild restrictive lung disease with FEVI 1.67 liters and 82% FEVI/FVC. The bronchoalveloar larvage fluid included many asbestos bodies, indicating previous exposure to asbestos. Transmission electron microscopy (TEM) using an energy dispersive X-ray analyzer (EDX) revealed many asbestos bodies consisting of mainly crocidolite fibers (6,071×10^6 fibers/g of dry lung). The patient had an unusually high asbestos content of 6,112×10^6 asbestos fibers/g of dry lung.
Han, Jeong Hee,Park, Jung Duck,Sakai, Kiyoshi,Hisanaga, Naomi,Chang, Hee Kyung,Lee, Yong Hwan,Kwon, Il Hoon,Choi, Byung Sun,Chung, Yong Hyun,Kim, Hyeon Yeong,Yang, Jung Sun,Cho, Myung Haing,Yu, Il Je Informa UK (TaylorFrancis) 2009 Journal of toxicology and environmental health. Pa Vol.72 No.21
<P>To evaluate the effects of environmental asbestos exposure on the inducement of lung cancer, pulmonary asbestos and non-asbestos fiber content was determined in 36 normal Korean subjects and 38 lung cancer subjects with no known occupational history of asbestos exposure. Pulmonary asbestos fiber content was measured by transmission electron microscopy (TEM) with energy-dispersive x-ray analysis after applying a low-temperature ashing procedure. Chrysotile fibers were the major fiber type found in the lungs of the Korean subjects. The asbestos fiber concentrations found in the lungs of normal males (25) and females (11) were 0.26 x 10(6) fibers/g of dry lung tissue and 0.16 x 10(6) fibers/g of dry lung tissue, respectively. The asbestos concentrations found in the lungs of cancer subjects were 0.16 x 10(6) fibers/g of dry lung tissue for 32 males and 0.44 x 10(6) fibers/g of dry lung tissue for 6 females. No statistical difference was found in pulmonary asbestos content between the normal and lung cancer subjects, whereas a statistical difference was noted between normal and lung cancer subjects with respect to lung non-asbestos content, indicating a potential role for non-asbestos fibers being associated with lung cancer.</P>
Case Report of Asbestos Exposure-Related Lung Carcinoma
Hee Kyung Chang,Yong Hwan Lee,Kiyoshi Sakai,Naomi Hisanaga,Yong Hyun Chung,Jeong Hee Han,Il Je Yu 한국독성학회 2002 Toxicological Research Vol.18 No.1
A 61 year-old female patient was hospitalized for lung cancer. Her occupational history indicated that she had worked for an asbestos company for 9 years from 1976. The histopathology of the lung revealed malignant bronchioalveolar adenocarcima (stage Ⅲ) in the lower-left lobe, and a lung sample was found to contain an unusually high level of asbestos, 218.9×10^6 asbestos fibers/g of dry lung tissue. The majority of asbestos fibers found was chrysotile, yet no asbestos body was detected. When compared with Korean male (0.3×10^6 fibers/g of dry lung tissue) and female subjects (0.15×10^6 fibers/g of dry lung tissue) with no known history of occupational asbestos exposure, the apparent cause of the lung cancer in the current patient was occupational exposure to asbestos.