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Toshihiko Takahashi, Takashi Hasegawa, Tanji Hoshi 서울시립대학교 도시과학연구원 2005 International journal of urban sciences (IJUS) Vol. No.
Self-rated health is one of the most common measures of health status in the health sciences. However, little is known about its social and psychological background. In the present study, we evaluated a total of 13,034 subjects identified from a 2001 survey in Tama City, Japan. The study design was cross-sectional and targeted individuals aged 65 years or older. Data, including medication use, socio-economic factors, lifestyle and instrumental ADL were collected via self-administered questionnaires. A decrease in self-rated health with age was noted both in men and women. Factor analyses showed these factors clustered into 4 unrelated groups in men and 5 groups in women. A theoretical model with four latent and 14 manifest variables was formulated by AMOS 5.0 (SPSS, Japan). There were four latent variables. In the present study, relationships between these four latent variables were examined. The findings showed that decreases in yearly income, daily activity, and poor social support could disrupt the balance of health in elderly populations. The structural equation models (SEMs) could comprise schematically a new ordered nature of self-rated health and social circumstances.
Photodynamically induced endothelial cell injury and neutrophil-like HL-60 adhesion
Takahashi, Miho,Nagao, Tomokazu,Matsuzaki, Kazuki,Nishimura, Toshihiko,Minamitani, Haruyuki Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
Photodynamic therapy (PDT) is a treatment modality based on photochemical reaction and the resultant cytotoxic reactive oxygen species. The platelet thrombus formation leading to stasis observed in vivo during PDT is called vascular shut down (VSD) effect. To investigate the mechanism of the VSD effect, we observed Human Umblical Vein Endothelial Cell (HUVEC) injury induced by photochemical reaction. We observed cell retraction and blebbing after PDT. It seems that the injury was not fetal and only morphological change. Then, the cytoplasm was stained by Calcein-AM and subendothelial area was evaluated from fluorescence microscopy. The rate of subendothelial area after PDT increased significantly. Second, we investigated interaction between neutrophils and HUVEC. Human promyelocytic leukemia cells (HL-60) were differentiated into neutrophil by incubation with all-trans retinoic acid. Calcein-AM labeled neutrophil adhesion to HUVEC was evaluated from fluorescence microscopy. PDT-induced neutrophil adhesion to HUVEC depended more on the exposure of subendothlial area than on neutrophil activation. This result suggests that there is a certain interaction between neutrophil and HUVEC during PDT.
Material balance of precious metals in household bulky waste
( Hisashi Takahashi ),( Toshihiko Matsuto ),( Takayuki Matsuo ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 한국폐기물자원순환학회 심포지움 Vol.2019 No.1
Ash melting process and gasification melting system became popular in late 1970s. Because of high transfer rate of to molten metal, melting process can be an efficient recycling system for precious metal. The authors collected samples of metal, and showed high potential as precious metals and difference of contents by the type of melting system. However, the source of precious metals were remained questionable. In this study, shredded residue of bulky and incombustible waste were analyzed based on the assumption that electric and electrical products contained precious metals in circuit board, for example. Sampling of residues was requested to municipal solid waste incinerator or gasification melting system which has shredding facility nearby. Table 1 summarized the type of samples. S is stoker-type incinerator, G-K is kiln type and G-C is coke bed type gasification- melting facility. From shredding plant, both of over and under sieve residues were collected. G-C1 and C2 has no separation after shredding treatment. Bottom ash was sampled from S incinerator. Sample for analysis were taken by cone-quartering method, and it was crushed with a hammer. After digested in HF and aqua regia. Au, Pt, Pd were analyzed by ICP mass spectrometry. Table 2 shows the results of compositional analysis of shredded residue. By assuming that metals, plastics, and woods do not contain precious metals, circuit board and small particles were analyzed. Circuit board of G-C2 was not measured due to very small amount. Fig. 1 shows the concentration of Au in each sample. Values below detection limit were plotted on an axis. Broken line shows the range of metals (28 facilities) analyzed in the past study. The concentration of G-C1 in this study is apparently low, probably due to sampling error. Fig. 2 compared the amount of Au contained in shredded residue and that in incineration residue. The amount of Au in shredded residues is much smaller than that in incineration residues. As described above, contribution of shredded residue is not significant, so precious metals are contained in other category of waste, such as combustible waste.
( Shigetoshi Takahashi ),( In-hee Hwang ),( Takayuki Matsuo ),( Toshihiko Matsuto ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
Fabric filter is widely used as typical dust collection equipment in the waste incineration facilities. On the other hand, the pressure drop in the fabric filter occupies a large amount of energy loss of the flue gas treatment system. Meanwhile, the repetitive reduction of the pressure drop in bag house was reported by spraying phosphoric acid wastewater (PAW) into incinerator. The decrease of pressure drop on fabric filter is important because it is deeply related to saving of energy consumption in waste incineration plants. In this study, the operating data of incineration plant was analyzed to investigate the short-term and long-term effect on pressure drop by spraying PAW. As the short-term effect of PAW spray, the total reduction of pressure drop of fabric filter was always decreased but it was not proportional to the amount of phosphorus into the incinerator. There was no clear correlation between the total reduction of the pressure drop and the utilization period of fabric filters. The total reduction of pressure drop was range from 0.3 to 1.2 kPa regardless the utilization period of fabric filters. On the other hand, as the long- term effect of PAW spray, nevertheless the pressure drop rarely increased without spraying PAW, the pressure drop showed a gradual increase trend at the normal operating period after finishing spraying PAW. Especially it was remarkable that the pressure drop increased at the spraying PAW just after the replacement of all fabric filters. These results suggest that the spraying PAW produces the reduction of pressure drop in the short-term but leads to the increase of pressure drop increase and makes the operating condition worse from the long-term viewpoint.
Toyoshima, Morio,Takahashi, Nobuhiro,Jono, Takashi,Yamawaki, Toshihiko,Nakagawa, Keizo,Arai, Katsuyoshi 통신위성우주산업연구회 2002 Joint Conference on Satellite Communications Vol.2002 No.-
Optical communications in the presence of atmospheric turbulence are affected by the tubulence-induced optical scintillation. The optical scintillation makes the communication quality, i.e. bit error rate (BER), degrade. Because of the intrinsically narrow optical beam, the random pointing-jitter also generates additional signal fading on the communication signal. A broader optical beam could mitigate the signal fading, but would require greater transmitted power than that for the original beam to achieve the same required BER. In this paper, the average BER is derived from the probability density function (PDF) of the optical signal in the presence of atmospheric turbulence and random pointing-jitter. The joint PDF, of the lognormal PDF caused by atmospheric turbulence and the beta PDF of the random pointing-jitter, is derived by using the characteristic function of each PDF. It is shown that an optimum beam divergence of the transmitting laser beam exists, and the optimum value changes slightly with the atmospheric conditions. The beam divergence angle should be about 7 times larger than the random pointing-jitter of the optical tracking system. An example of the optimum link estimates for the tracking and communication channels are shown for a ground-to-satellite optical communication link.