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51.
Employing a variance stabilization transformation, a random-effects model with a normal prior is proposed for incorporating historical controls in the estimation of dose-response relationships. The advantages and disadvantages of maximum likelihood and empirical Bayes estimators are discussed. A two-stage method is introduced for the prudent use of historical controls. 相似文献
52.
Ichiyo Habuchi Shingo Dobashi Izumi Tsuji Koh Iwata 《International Journal of Japanese Sociology》2005,14(1):94-108
Abstract: This paper, by analyzing Internet usage via mobile phones in Japan, aims to clarify an aspect of information behavior in present-day Japanese society.
Many discourses on the mobile Internet in Japan, either positive or negative, emphasize its novelty and describe this new media as an exotic phenomenon. These discourses can be divided into two categories. The nationalistic discourses and the moral panic discourses. Both types of discourse have built certain images of social influences of the mobile Internet in the future. However, it would be unwise to conclude that those images of the mobile Internet express the reality of this new medium, simply because they lack empirical ground.
With these points in mind, based on the result of our national survey conducted in 2001, we would like to show the actual status of use of the mobile Internet and discuss that the ordinary usage is a critically important realm to understand the process of social reception of the mobile Internet. As our data shows, although the actual usage of the mobile Internet is not very conspicuous, it gives us a chance to understand how the mobile Internet has been integrated into our everyday lives. 相似文献
Many discourses on the mobile Internet in Japan, either positive or negative, emphasize its novelty and describe this new media as an exotic phenomenon. These discourses can be divided into two categories. The nationalistic discourses and the moral panic discourses. Both types of discourse have built certain images of social influences of the mobile Internet in the future. However, it would be unwise to conclude that those images of the mobile Internet express the reality of this new medium, simply because they lack empirical ground.
With these points in mind, based on the result of our national survey conducted in 2001, we would like to show the actual status of use of the mobile Internet and discuss that the ordinary usage is a critically important realm to understand the process of social reception of the mobile Internet. As our data shows, although the actual usage of the mobile Internet is not very conspicuous, it gives us a chance to understand how the mobile Internet has been integrated into our everyday lives. 相似文献
53.
Takashi Saitoh Nils Chr Stenseth Ottar N. Bj?rnstad 《Researches on Population Ecology》1998,40(1):61-76
Population dynamics of the gray sided-vole,Clethrionomys rufocanus, in Hokkaido, Japan were described on the basis of 225 time series (being from 12 to 31 years long); 194 of the time series
have a length of 23 years or longer. The time series were classified into 11 groups according to geographic proximity and
topographic characteristics of the island of Hokkaido. Mean abundance varied among populations from 1.07 to 21.07 individuals
per 150 trap-nights. The index of variability for population fluctuation (s-index) ranged from 0.204 to 0.629. Another index for population variability (amplitude on log-10 scale) ranged from 0.811
to 2.743. Mean abundance and variability of populations were higher in the more northern and eastern regions of the island.
Most populations, except for the southernmost populations, exhibited significant direct density-dependence in population growth.
Detection rate for delayed density-dependence varied among groups from 0% to 22.6%. Both direct and delayed density-dependence
tended to be stronger in the more northern and eastern populations. The proportion of cyclic populations was higher in the
northern-eastern areas than that in the southern-western areas. There was a clear gradient from the asynchronous populations
in southwest, to the highly synchronized populations in the northeast. 相似文献
54.
Yasuyuki Ishibashi Takashi Saitoh Syuiti Abe Michihiro C. Yoshida 《Researches on Population Ecology》1998,40(1):51-59
Kinship amongClethrionomys rufocanus was investigated during the winter of 1992/93 in a 3-ha enclosure using both molecular and catch-mark-release techniques.
Forty-six adult voles (22 males and 24 females) having high heterozygosities, which were collected from several natural populations,
were released into the enclosure on 29 September 1992. Most fall-born individuals of both sexes stayed in their natal site
during the non-breeding period (December–March), although reproductively active females dispersed during the fall breeding
season (October–November). These philopatric individuals aggregated and formed an maternal family in the winter. Several females
which failed to reproduce were solitary during this season. Some individuals which were derived from several families also
aggregated into a mixed lineage group. Survival rate of fall-born voles from earlier litters was higher than that from later
ones. Maternal families broke up soon after the onset of spring reproduction. Most females established a territory near the
wintering site and made a kincluster, in which close relatives neighbored each other. Maternal families in winter bring about
female kin-clusters in spring, which may influence reproductive output in the breeding season. 相似文献
55.
Takashi Saitoh 《Researches on Population Ecology》1991,33(2):367-386
Summary The effects of breeding territoriality on the stability of grey red-backed vole (Clethrionomys rufocanus bedfordiae) populations were investigated on a control grid and a grid on which the voles were fed, in an outdoor enclosure in Hokkaido,
Japan. Vole populations were monitored by live trapping from 1984 to 1986: (1) Population density was 2–7 times greater on
the experimental grid to which food was added than on the control grid. Reproductive output was more closely associated with
the difference in density between grids than survival or dispersal (immigration and emigration) rates. (2) The number of adult
females and pregnancy rate of the experimental population were significantly greater than those of the control one. The difference
in the number of adult females between the populations was greater than that in pregnancy rate. (3) The proportion of successful
litters and the number of weanlings per litter were not significantly different between the control and experimental population.
(4) Adult females held territories on both the control and experimental grid; they were spaced out more than would be expected
from random occupation. The territories overlapped more on the experimental grid than on the control grid. (5) Mean territory
size of adult females on the experimental grid was about half of that on the control grid. The territory size was correlated
negatively with population density. (6) The proportion of trap sites that were used by adult females was significantly greater
on the experimental grid than on the control grid. This suggests that adult females on the experimental grid used the area
more extensively. This factor, in association with territory size and overlapping of territory, was also important in causing
the difference in the number of adult females between the grids. (7) These results call into question the hypothesis that
territoriality stabilizes the density in populations ofClethrionomys. 相似文献
56.
Previous studies have shown that income inequality in society is negatively associated with individuals subjective well-being (SWB), such as their perceived happiness and self-rated health (SRH). However, it is not realistic to assume that individuals have precise information about actual income distribution measured by the Gini coefficient or other statistical measures. In the current study, we examined how perceived income inequality, rather than actual inequality, was associated with SWB, using cross-sectional data collected from a nationwide, Internet survey conducted in Japan (N = 10,432). We also examined how this association was confounded by individuals’ objective and subjective income status, considering the possibility that individuals with lower income status are more inclined to both perceive income inequality and feel unhappy/unhealthy. In our analysis, we focused on the perception of widening income inequality (as perceived income inequality), perceived happiness and SRH (as SWB), and household income and living standards compared with 1 year ago and compared with others (as income status). We also controlled for personality traits. We obtained three key findings: (1) perceived income inequality was negatively associated with SWB; (2) both perceived income inequality and SWB were associated with income status; and (3) the association between perceived income inequality and SWB was attenuated after controlling for income status, but not fully for perceived happiness. These findings suggest that perceived income inequality, which links actual income inequality to SWB, should be further studied. 相似文献
57.
Takashi Hayashi 《Theory and Decision》2012,73(4):591-604
This article provides a simple decision theoretic model in which elements of the world successively enter the decision maker??s scope and the state space expands over time, which is intended to be the closest correspondence to the standard subjective expected utility theory. We propose a dynamic consistency condition that after any expansion of the scope, the preference ranking should remain unchanged over acts to which the expansion is irrelevant. Together with other natural axioms, it characterizes a model in which the decision maker??s belief extends over time in order that the marginal distribution of the new belief induced over the old state space coincides with the old belief. It is extended to encompass both expansion of scope and learning events, and we characterize the model with an additional property that the decision maker??s belief updating follows Bayes?? rule when she learns events. 相似文献
58.
The purpose of assessing adverse events (AEs) in clinical studies is to evaluate what AE patterns are likely to occur during treatment. In contrast, it is difficult to specify which of these patterns occurs in each patient. To tackle this challenging issue, we constructed a new statistical model including nonnegative matrix factorization by incorporating background knowledge of AE-specific structures such as severity and drug mechanism of action. The model uses a meta-analysis framework for integrating data from multiple clinical studies because insufficient information is derived from a single trial. We demonstrated the proposed method by applying it to real data consisting of three Phase III studies, two mechanisms of action, five anticancer treatments, 3317 patients, 848 AE types, and 99,546 AEs. The extracted typical treatment-specific AE patterns coincided with medical knowledge. We also demonstrated patient-level safety profiles using the data of AEs that were observed by the end of the second cycle. 相似文献
59.
Takashi Kazama 《International Journal of Japanese Sociology》2020,29(1):39-51
This article discusses how the approach towards sexual minorities has shifted from exclusion to inclusion between the mid-1980s and the present, and explores how the view that Japan is more tolerant of sexual minorities than the USA and Europe actually limits discussions on citizenship. An examination of the AIDS crisis and the Fuchu Youth Center court case in the 1980s and 1990s shows that gay men were regarded as a threat to national identity, seen to endanger Japan and whose sexuality was deemed to be unintelligible. In a word, their citizenship was denied. In the 2010s the ruling Liberal Democratic party issued a report on sexual orientation and gender identity (SOGI) issues, which examined measures aimed at achieving equality for those who suffer from SOGI discrimination. While sexual minorities became an object of inclusion, only partial and circumscribed citizenship was granted. Although the report ostensibly aims to promote SOGI diversity, it relegates the existence of minorities to the private sphere, and limits diversity by demanding the acceptance of a “tolerant culture” predicated on heterosexism and gender norms. By positioning their diversity effort in Japan's “tolerant traditional culture,” the party inadvertently incorporates nationalism and renders it central to their approach towards SOGI diversity. This article concludes that the discourse that the Japanese state is tolerant of sexual minorities undermines the recognition of sexual minorities’ citizenship. 相似文献
60.
Takashi Hayashi 《Theory and Decision》2011,70(4):399-430
We examine if and to what extent choice dispositions can allow dependence on contexts and maintain consistency over time, in a dynamic environment under uncertainty. We focus on one of the context dependence properties,
opportunity dependence because of being affected by anticipated regret, where the consequentialist choice framework is maintained.
There are two sources of potential inconsistency: one is arrival of information, and the other is changing opportunities.
First, we go over the general method of resolution of potential inconsistency, by taking any kinds of inconsistency as given
constraints. Second, we characterize a class of choice dispositions that are consistent to information arrival, but may be
inconsistent to changing opportunities. Finally, we consider the overall requirement of dynamic consistency and show that
it necessarily implies each of consistency to information arrival and independence of choice opportunities. The last result
states that the two kinds of potential inconsistency cannot “compensate” each other to recover dynamic consistency overall. 相似文献