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排序方式: 共有70条查询结果,搜索用时 78 毫秒
1.
H. Haario M. Laine M. Lehtinen E. Saksman J. Tamminen 《Journal of the Royal Statistical Society. Series B, Statistical methodology》2004,66(3):591-607
Summary. We discuss the inversion of the gas profiles (ozone, NO3 , NO2 , aerosols and neutral density) in the upper atmosphere from the spectral occultation measurements. The data are produced by the 'Global ozone monitoring of occultation of stars' instrument on board the Envisat satellite that was launched in March 2002. The instrument measures the attenuation of light spectra at various horizontal paths from about 100 km down to 10–20 km. The new feature is that these data allow the inversion of the gas concentration height profiles. A short introduction is given to the present operational data management procedure with examples of the first real data inversion. Several solution options for a more comprehensive statistical inversion are presented. A direct inversion leads to a non-linear model with hundreds of parameters to be estimated. The problem is solved with an adaptive single-step Markov chain Monte Carlo algorithm. Another approach is to divide the problem into several non-linear smaller dimensional problems, to run parallel adaptive Markov chain Monte Carlo chains for them and to solve the gas profiles in repetitive linear steps. The effect of grid size is discussed, and we present how the prior regularization takes the grid size into account in a way that effectively leads to a grid-independent inversion. 相似文献
2.
Stormi Kati Lindholm Anni Laine Teemu Korhonen Tuomas 《Journal of Management and Governance》2020,24(3):623-653
Journal of Management and Governance - This study examines how original equipment manufacturers (OEMs) can segment their product-oriented services customers with the help of a recency, frequency,... 相似文献
3.
Dejan Trifunović Bojan Ristić Marko Ivković Svetozar Tanasković Leo Italiano Stefania Tattoni 《Transition Studies Review》2009,16(2):269-286
The privatization process and foreign direct investments (FDI) are among the most important economic issues in transitional
countries. FDI has enormous influence on transitional countries that need serious structural changes. In this paper we will
study FIAT’s decision to invest in the Serbian automotive industry. We will try to rationalize FIAT’s decision because Serbian
car manufacturer ZASTAVA was not the only alternative for FIAT to invest in the Balkans. In order to justify FIAT’s decision
we will apply the Mullins model of horizontal and vertical FDI, examine the importance of the cooperating history between
two car manufacturers and compare macroeconomic conditions and Global Competitiveness of Serbia and Romania, which was the
main alternative for FIAT. Finally, we will also try to explain why FIAT decided to announce the investment at the end of
political campaign in Serbia when pools gave anti-European parties higher chances for victory, instead of waiting to see the
outcome of the elections.
相似文献
Stefania TattoniEmail: |
4.
Jelena Žarković Rakić Ana Aleksić Mirić Lara Lebedinski Marko Vladisavljević 《Voluntas: International Journal of Voluntary and Nonprofit Organizations》2017,28(6):2423-2448
This paper analyses welfare regime changes in Serbia and their impact on social enterprise development in the last two decades. We cover the period of significant transition-related reforms within the welfare state, with important implications on the position of these enterprises. Using data gathered from the qualitative field research, our study shows that there are two broad groups of factors that are important for development of the new generation of social enterprises, those that emerged in the last decade with an idea to foster entrepreneurial spirit and expanded into new domains other than those providing assistance to the marginalized groups. First, their decision to enter the social economy sector still depends on the environment created by the state. Secondly, their sustainability is affected by the factors typically found in any other enterprise of comparable scale like business skills, capacity to form networks and partner with relevant stakeholders. 相似文献
5.
Brief Report: The Role of Ego Development in Psychosocial Adjustment Among Boys With Delayed Puberty
Kaj Lindfors Marko Elovainio Sanna Wickman Risto Vuorinen Jari Sinkkonen Leo Dunkel Aleksi Raappana 《Journal of research on adolescence》2007,17(4):601-612
This study examined the role of ego development, as measured with the Washington University sentence completion test, in the relationship between pubertal maturation and psychosocial adjustment (self-image and depression) in adolescent boys. The data consisted of 73 boys between 14 and 16 years of age. The results indicated that late maturing boys were also psychologically more immature, and that they experienced negative feelings about sexuality. Additionally, higher ego development was associated with elevated levels of anxiety and depression among late maturing boys. In boys with average pubertal maturation, higher ego development was associated with lower levels of anxiety and depression. 相似文献
6.
Pia K. Eriksson Marko Elovainio Sanna Mäkipää Hanna Raaska Jari Sinkkonen Helena Lapinleimu 《European Journal of Social Work》2015,18(3):412-429
We examined how satisfied Finnish adoptive parents were with statutory pre-adoption counselling in inter-country adoptions. The data were collected through the Finnish Adoption Study using a retrospective survey measuring satisfaction with received pre-adoption counselling. All adoptive parents with a child under the age of 18, adopted from abroad between the years 1990 and 2007, were included. The sample of the study comprised parents of 1451 children and a total response rate of 55.7% was achieved. The data consisted of self-scored reports of satisfaction as well as open answer questions. Parent satisfaction and associated variables were analysed using chi-square and multiple logistic regression. Of the respondents, 81.7% reported satisfaction with the pre-adoption counselling they had received. The level of satisfaction was stable over time and did not differ according to service provider, whereas family type and sending country were associated with satisfaction. However the explanations for satisfaction were different for those services provided in units specialized in adoption and for those provided by municipal child protection services. The components found to explain satisfaction and dissatisfaction were experience, adoption knowledge, and attitude of the social worker, service accessibility and availability issues, as well as the content of the pre-adoption counselling offered. 相似文献
7.
In this paper we present a new characterization of the Pareto distribution and consider goodness-of-fit tests based on it. We provide an integral and Kolmogorov–Smirnov-type statistics based on U-statistics and we calculate Bahadur efficiency for various alternatives. We find locally optimal alternatives for those tests. For small sample sizes, we compare the power of those tests with some common goodness-of-fit tests. 相似文献
8.
Abstract There is a need to understand the associations between attitudes towards retirement in specific occupations and various psychosocial and work-related factors. This study identified correlates of retirement thoughts and retirement preference in hospital physicians. The sample comprised 447 (251 male and 196 female) physicians from three hospital districts in Finland. After adjustment for gender, age and salary, minor psychiatric morbidity increased likelihood of retirement thoughts and retirement preference. Retirement thoughts and retirement preference were more common in doctors reporting low job control, poor teamwork and unjust supervision than in doctors perceiving their working conditions more favorably. Work preference was associated with high overwork. The associations of work characteristics with retirement thoughts and retirement preference largely persisted after control for indicators of health and social circumstances. In conclusion, in addition to demographic and financial factors and health, retirement attitudes in hospital physicians seem to be related to organizational and managerial factors that are potentially amendable to intervention. This has implications for retaining hospital physicians who might otherwise retire. 相似文献
9.
10.
We investigate divisions within the citation network in economics using citation data between 1990 and 2010. We consider all partitions of top institutions into two equal‐sized clusters and pick the one that minimizes cross‐cluster citations. The strongest division is much stronger than could be expected to be found under idiosyncratic citation patterns and is consistent with the reputed freshwater/saltwater division in macroeconomics. The division is stable over time but varies across the fields of economics. (JEL A11, D85, I23) 相似文献