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Cloud condensation nuclei activity at Jeju Island, Korea in spring 2005
Kuwata, M.,Kondo, Y.,Miyazaki, Y.,Komazaki, Y.,Kim, J. H.,Yum, S. S.,Tanimoto, H.,Matsueda, H. Copernicus GmbH 2008 Atmospheric Chemistry and Physics Vol.8 No.11
<P>Abstract. We measured the number concentrations of cloud condensation nuclei (CCN) and the size distributions of CCN/CN (CN: condensation nuclei) ratios at supersaturations (SSs) of 0.097, 0.27, 0.58, and 0.97% at Jeju Island, Korea during March-April 2005. We made simultaneous measurements of aerosol inorganic ions, water-soluble organic carbon (WSOC), organic carbon (OC), and elemental carbon (EC) in PM2.5. The CCN/CN ratios increased with increasing particle diameter, and the diameter at CCN/CN=0.5 was defined as D50. D50 represents the activation dry diameter of atmospheric particles. The average D50 at SS=0.097% and 0.97% was 136±17 nm and 31±3 nm, respectively. The temporal variation of D50 at SS=0.097% was correlated with the mass fraction of water-soluble components (inorganic ions + WSOC), indicating that the temporal variation of CCN activity was mainly controlled by changes in the water-soluble components fraction. The critical dry diameter (Dcrit), which is the threshold dry diameter for CCN activation, was calculated from the observed aerosol chemical compositions by Köhler theory for comparison with D50. The D50 at SS=0.097% was correlated (r2=0.48) with calculated Dcrit, although Dcrit was larger than D50 by 20-29% on average. The systematic difference between D50 and Dcrit could be caused by the size dependence of the aerosol chemical compositions or surface tension lowering caused by the mixing of water-soluble organic compounds. This difference corresponds to a 27±14% uncertainty in the CCN number concentration estimated from the observed particle number size distribution. </P>
박찬교(C . K . Park),Y . Komazaki,S . Suda 한국수소및신에너지학회 1992 한국수소 및 신에너지학회논문집 Vol.3 No.2
New type of metal hydride heat pump (MHHP) combined with hydrogen compressor was constructed for cooling purpose. A model for calculating the coefficient of performance (COP) is presented for MHHP which consisted of two different stages (enforced and natural stage), and compared with the experimental results. A concept of adiabatic compression work is introduced in the model on the basis of Carnot reversible analysis and the dependence of COP on the various operational parameters is discussed.
박찬교(C . K . Park),Y . Komazaki,S . Suda 한국수소및신에너지학회 1993 한국수소 및 신에너지학회논문집 Vol.4 No.1
The operational characteristics of a metal hydride heat pump system are strongly dependent on the amound of hydrogen gas transferred by hydriding and dehydriding reactions between the reactors under dynamic conditions. A new metal hydride heat pump combined with hydrogen compressor was constructed and the dependency of its operating conditions on such as cycle time, amount of hydrogen to be transferred between two reacting metal hydride reactors, operating temperature, and heat transmission characteristics of the reactors was investigated to find the optimum operating efficiency. These conditions were also evaluated in connection with the cooling output and hydrogen compressor connected to the system in order to enhance the total efficiency.
Clinical associations of Trousseau's syndrome associated with cerebral infarction and ovarian cancer
Hirokuni Takano,Keiko Nakajima,Yoko Nagayoshi,Hiromi Komazaki,Jiro Suzuki,Hiroshi Tanabe,Shigeki Niimi,Seiji Isonishi,Aikou Okamoto 대한부인종양학회 2018 Journal of Gynecologic Oncology Vol.29 No.5
Objective: Since there have been few large series studies to date, we investigated the relationship between Trousseau's syndrome associated with cerebral infarction and its clinical associations with ovarian cancer. Methods: In this study, we investigated the association between cerebral infarction onset and ovarian cancer. Eight-hundred twenty-seven consecutive ovarian cancer patients from 4 affiliated academic institutions were included in the study over a 12 years period. All patients were histopathologically diagnosed as epithelial ovarian cancer and were analyzed retrospectively. Results: The 27 patients (3.2%) presented with cerebral infarction during the study period, 14 patients onset prior to treatment (1.7%), and 13 patients onset after start of initial treatment (1.5%). Univariate analysis and multivariate analysis was performed for onset of Trousseau's syndrome and various clinical and pathological parameters. There was no statistical significance between the occurrence of Trousseau's syndrome with age or International Federation of Gynecology and Obstetrics (FIGO) stage; however, univariate analysis and multivariate analysis demonstrated a statistically significant association between clear cell carcinoma (CCC) and non-CCC histology. Conclusion: Thus, our results demonstrate that Trousseau's syndrome with cerebral infarction occurred with greater incidence among CCC cases compared to non-CCC cases.
Bae, Min-Suk,Hong, Chun-Sang,Kim, Young J.,Han, Jin-Seok,Moon, Kwang-Ju,Kondo, Yutaka,Komazaki, Yuichi,Miyazaki, Yuzo Elsevier 2007 Atmospheric environment Vol.41 No.13
<P><B>Abstract</B></P><P>A formal intercomparison of fine particle elemental (black) carbon is conducted involving three real-time semi-continuous measurement systems. Two-hourly interval time-resolved measurements of organic carbon (OC) and elemental carbon (EC) were performed at the Gosan site, Korea during Atmospheric Brown Clouds–East Asian Regional Experiment 2005 (ABC-EAREX2005) campaign. They were operated by the same semi-continuous field carbon instruments of Sunset Laboratory (thermal optical transmittance) in PM<SUB>2.5</SUB> particulate. However, their thermal protocols (four and two steps for OC and five and two steps for EC) were different. The co-located 1min black carbon (BC) concentrations were compared by an Aethalometer for an intercomparison study.</P><P>As a result, the poor <I>R</I><SUP>2</SUP> of OC between two different temperature protocols suggested that OC can be significantly more biased by the slight differences of maximum temperature (870 and 840°C) and a number of temperature steps (four steps and two steps) with their hold times. However, EC that is a smaller fraction of total carbon (TC) shows the good agreement between two different protocols, which are under a mixture of 2% O<SUB>2</SUB> and 98% He in six temperature steps and two temperature steps as max as 900 and 880°C with the slope of 1.05±0.15 (<I>R</I><SUP>2</SUP> of 0.98). The different slopes between EC and BC, which show the range of 1.23–1.61, demonstrate the variability of the attenuation coefficient of the BC particulate.</P>