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Koji Matsuo,Seiji Mabuchi,Mika Okazawa,Mahiru Kawano,Hiromasa Kuroda,Shoji Kamiura,Tadashi Kimura 대한부인종양학회 2015 Journal of Gynecologic Oncology Vol.26 No.1
Objective: Presence of high-risk factor in cervical cancer is known to be associated with decreased survival outcomes. However, the significance of multiple high-risk factors in early-stage cervical cancer related to survival outcomes, recurrence patterns, and treatment implications is not well elucidated. Methods: A retrospective study was conducted for surgically treated cervical cancer patients (stage IA2–IIB, n=540). Surgical-pathological risk factors were examined and tumors expressing ≥1 high-risk factors (nodal metastasis, parametrial involvement, or positive surgical margin) were eligible for analysis (n=177, 32.8%). Survival analysis was performed based on the number of high-risk factors and the type of adjuvant therapy. Results: There were 68 cases (38.4%) expressed multiple high-risk factors (2 high-risk factors: n=58, 32.8%; 3 high-risk factors: n=10, 5.6%). Multiple high-risk factors remained an independent prognosticator for decreased survival outcomes after controlling for age, histology, stage, and treatment type (disease-free survival: hazard ratio [HR], 2.34; p=0.002; overall survival: HR, 2.32; p=0.007). Postoperatively, 101 cases (57.1%) received concurrent chemoradiotherapy (CCRT) and 76 cases (42.9%) received radiotherapy (RT) alone. CCRT was beneficial in single high-risk factor cases: HRs for CCRT over RT alone for cumulative risk of locoregional and distant recurrence, 0.27 (p=0.022) and 0.27 (p=0.005), respectively. However, tumor expressing multiple high-risk factors completely offset the benefit of CCRT over RT alone for the risk of distant recurrence: HR for locoregional and distant recurrence, 0.31 (p=0.071) and 0.99 (p=0.980), respectively. Conclusion: Special consideration for the significance of multiple high-risk factors merits further investigation in the management of surgically treated early-stage cervical cancer.
2014-2015 MULTIPLE OUTBURSTS OF 15P/FINLAY
Ishiguro, Masateru,Kuroda, Daisuke,Hanayama, Hidekazu,Kwon, Yuna Grace,Kim, Yoonyoung,Lee, Myung Gyoon,Watanabe, Makoto,Akitaya, Hiroshi,Kawabata, Koji,Itoh, Ryosuke,Nakaoka, Tatsuya,Yoshida, Michitos American Astronomical Society 2016 The Astronomical journal Vol.152 No.6
<P>Multiple outbursts of a Jupiter-family comet (JFC), 15P/Finlay, occurred from late 2014 to early 2015. We conducted an observation of the comet after the first outburst and subsequently witnessed another outburst on 2015 January 15.6-15.7. The gas, consisting mostly of C-2 and CN, and dust particles expanded at speeds of 1110 +/- 180 m s(-1) and 570 +/- 40 m s(-1) at a heliocentric distance of 1.0 au. We estimated the maximum ratio of solar radiation pressure with respect to the solar gravity beta(max) = 1.6 +/- 0.2, which is consistent with porous dust particles composed of silicates and organics. We found that 10(8)-10(9) kg of dust particles (assumed to be 0.3 mu m - 1 mm) were ejected through each outburst. Although the total mass is three orders of magnitude smaller than that of the 17P/Holmes event observed in 2007, the kinetic energy per unit mass (10(4) J kg(-1)) is equivalent to the estimated values of 17P/Holmes and 332P/2010 V1 (Ikeya-Murakami), suggesting that the outbursts were caused by a similar physical mechanism. From a survey of cometary outbursts on the basis of voluntary reports, we conjecture that 15P/Finlay-class outbursts occur >1.5 times annually and inject dust particles from JFCs and Encke-type comets into interplanetary space at a rate of similar to 10 kg s(-1) or more.</P>
Optical and Near-infrared Polarimetry of Non-periodic Comet C/2013 US10 (Catalina)
Kwon, Yuna Grace,Ishiguro, Masateru,Kuroda, Daisuke,Hanayama, Hidekazu,Kawabata, Koji S.,Akitaya, Hiroshi,Nakaoka, Tatsuya,Itoh, Ryosuke,Toda, Hiroyuki,Yanagisawa, Kenshi,Lee, Myung Gyoon,Ohta, Kouji American Institute of Physics 2017 The Astronomical journal Vol.154 No.4
<P>We present an optical and near-infrared (hereafter NIR) polarimetric study of a comet C/2013 US10 (Catalina) observed on UT 2015 December 17-18 at phase angles of alpha - 52 degrees.1-53 degrees.1. Additionally, we obtained an optical spectrum and multi-band images to examine the influence of gas emission. We find that the observed optical signals are significantly influenced by gas emission; that is, the gas-to-total intensity ratio varies from 5 to 30% in the RC and 3%-18% in the I-C bands, depending on the position in the coma. We derive the 'gas-free dust polarization degrees' of 13.8% +/- 1.0% in the RC and 12.5% +/- 1.1% in the IC bands and a gray polarimetric color, i.e., -8.7% +/- 9.9% mu m(-1) in optical and 1.6% +/- 0.9% mu m(-1) in NIR. The increments of polarization obtained from the gas correction show that the polarimetric properties of the dust in this low-polarization comet are not different from those in high-polarization comets. In this process, the cometocentric distance dependence of polarization has disappeared. We also find that the RC-band polarization degree of the southeast dust tail, which consists of large dust particles (100 mu m(-1) mm), is similar to that in the outer coma where small and large ones are mixed. Our study confirms that the dichotomy of cometary polarization does not result from the difference of dust properties, but from depolarizing gas contamination. This conclusion can provide a strong support for similarity in origin of comets.</P>
Comprehensive Assessment of the Utilization System for Marine Biomass Resources Using Exergy Flows
구로다 카나,나가타니 나오키,오쯔카 코지,Kuroda, Kana,Nakatani, Naoki,Otsuka, Koji The Korean Society for Marine Environment and Ener 2012 한국해양환경·에너지학회지 Vol.16 No.2
최근들어 육상의 인간 활동에 의한 다량의 오염물질 부하에 기인하여 연안에서 심각한 환경 문제가 발생하고 있다. 따라서 해양 생물체 이용 시스템이 육지와 해양간의 물질 순환을 시도하기 위하여 제안되었다. 포괄적인 평가는 제안된 시스템이 적절하고 지속가능한지를 밝힐 필요가 있다. 본 연구는 에너지의 질을 표현하고, 물질 순환 시스템에서 흐르는 물질과 에너지를 묘사하는 열역학적 개념의 엑서지를 도입하였다. 본 연구는 일본 오사카 중부에 위치한 사카이시의 물질 순환 시스템 내에서 물질, 에너지, 그리고 엑서지 흐름들을 제공한다. 엑서지는 엑서지 효율적인 물질 순환 시스템 내에서 무엇이 주요 역할인지 잘 이해하는데 도움을 주는 것으로 밝혀졌다. In recent years, serious environmental problems occur in coastal area due to high pollution loads from human activity in land. Marine biomass utilization system therefore has been proposed to prompt material circulation between land and sea. Comprehensive assessment is necessary to determine that the proposed system is suitable and sustainable. This study introduces thermodynamic concept exergy, which expresses energy quality, to describe material and energy flowing in the material circulation system. This study presents material, energy and exergy flows in the material circulation system at Sakai city located in the middle of Osaka in Japan. It is found that exergy helps a better understanding of what is a key role is in exergy-efficient material circulation system.