Yoshihiro Hirao | PubMed Health

PubMed2005

Development of a connection-method calculation utility for the DORT-TORT code.

A code package has been developed to utilise connection-method calculation for both 2-D and 3-D SN codes, DORT-TORT, extending further the capabilities of DORSET/TORSET. It also includes support utilities to make input preparation easier. Potential uses of the method are, for example, to allow the coupling of one problem to the end of another by transforming output fluxes of the former into an external source term for the latter. For evaluating the code's applicability in a more specific way, the coupling calculation has been performed using a two-leg duct-streaming problem with a 14 MeV neutron source. The RZ-RZ (DORT) result shows good overall agreement with the reference MCNP4B result. However, it is also found that the result is influenced by the dimension of the calculation region and that some transformation error has occurred. For evaluating the 3-D transformation, full preparation of first collision source is required for TORT.

Algorithms↗

PubMed2004

A case-control study of diet and prostate cancer in Japan: possible protective effect of traditional Japanese diet.

The age-adjusted incidence of prostate cancer is low in Japan, and it has been suggested that the traditional Japanese diet, which includes many soy products, plays a preventive role against prostate cancer. We performed a case-control study on dietary factors and prostate cancer in order to assess the hypothesis that the traditional Japanese diet reduces the risk of prostate cancer. Four geographical areas (Ibaraki, Fukuoka, Nara, and Hokkaido) of Japan were selected for the survey. Average daily intake of food from 5 years before the diagnosis was measured by means of a semi-quantitative food frequency questionnaire. We studied 140 cases and 140 individually age ( +/- 5 years)-matched hospital controls for analysis. Estimates of age-adjusted odds ratios (ORs) and linear trends were calculated by conditional logistic regression models with adjustment for cigarette smoking and total energy intake as confounding factors. Consumption of fish, all soybean products, tofu (bean curds), and natto (fermented soybeans) was associated with decreased risk. ORs of the fourth vs. first quartile and 95% confidence intervals (95%CIs) were 0.45 (0.20-1.02) for fish, 0.53 (0.24-1.14) for all soybean products, 0.47 (0.20-1.08) for tofu, and 0.25 (0.05-1.24) for natto. Consumption of fish and natto showed significantly decreasing linear trends for risk (P < 0.05). Consumption of meat was significantly associated with increased risk (the OR of the second vs. first quartile was 2.19, 95%CI 1.00-4.81). Consumption of milk, fruits, all vegetables, green-yellow vegetables, and tomatoes showed no association. Our results provide support to the hypothesis that the traditional Japanese diet, which is rich in soybean products and fish, might be protective against prostate cancer.

Adenocarcinoma↗