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Takayuki Takahashi,Hikaru Matsuoka,Rieko Sakurai,Jun Akatsuka,Yusuke Kobayashi,Masaru Nakamura,Takashi Iwata,Kouji Banno,Motomichi Matsuzaki,Jun Takayama,Daisuke Aoki,Yoichiro Yamamoto,Gen Tamiya 대한부인종양학회 2022 Journal of Gynecologic Oncology Vol.33 No.5
Objective: Human papillomavirus subtypes are predictive indicators of cervical intraepithelial neoplasia (CIN) progression. While colposcopy is also an essential part of cervical cancer prevention, its accuracy and reproducibility are limited because of subjective evaluation. This study aimed to develop an artificial intelligence (AI) algorithm that can accurately detect the optimal lesion associated with prognosis using colposcopic images of CIN2 patients by utilizing objective AI diagnosis. Methods: We identified colposcopic findings associated with the prognosis of patients with CIN2. We developed a convolutional neural network that can automatically detect the rate of high-grade lesions in the uterovaginal area in 12 segments. We finally evaluated the detection accuracy of our AI algorithm compared with the scores by multiple gynecologic oncologists. Results: High-grade lesion occupancy in the uterovaginal area detected by senior colposcopists was significantly correlated with the prognosis of patients with CIN2. The detection rate for high-grade lesions in 12 segments of the uterovaginal area by the AI system was 62.1% for recall, and the overall correct response rate was 89.7%. Moreover, the percentage of high-grade lesions detected by the AI system was significantly correlated with the rate detected by multiple gynecologic senior oncologists (r=0.61). Conclusion: Our novel AI algorithm can accurately determine high-grade lesions associated with prognosis on colposcopic images, and these results provide an insight into the additional utility of colposcopy for the management of patients with CIN2.
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.