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We consider two topological interpretations of the modal diamond—as the closure operator (C-semantics) and as the derived set operator (d-semantics). We call the logics arising from these interpretations C-logics and d-logics, respectively. We axiomatize a number of subclasses of the class of nodec spaces with respect to both semantics, and
characterize exactly which of these classes are modally definable. It is demonstrated that the d-semantics is more expressive than the C-semantics. In particular, we show that the d-logics of the six classes of spaces considered in the paper are pairwise distinct, while the C-logics of some of them coincide.
Mathematics Subject Classifications (2000): 03B45, 54G99.
Presented by Michael Zakharyaschev 相似文献
254.
Hjelmeland H Hawton K Nordvik H Bille-Brahe U De Leo D Fekete S Grad O Haring C Kerkhof JF Lönnqvist J Michel K Renberg ES Schmidtke A Van Heeringen K Wasserman D 《Suicide & life-threatening behavior》2002,32(4):380-393
Information obtained at interview from 1,646 parasuicide patients in 14 regions in 13 European countries participating in the WHO/EURO Multicentre Study on Suicidal Behaviour was used to study self-reported intentions involved in parasuicide. Comparisons were made across cultures, genders, and age groups. Although some statistically significant differences were found, the effect sizes were very small. The main finding from this study is thus that parasuicide patients in different countries tend to indicate that similar types of intentions are involved in their acts of parasuicide, and that the intentions do not vary greatly with gender or age. The hypothesis that rates of suicide and parasuicide vary between regions with the frequency with which suicidal intention is indicated by the patients was also tested, but was supported only for women and in relation to national suicide rates. The findings from this study are likely to be generalizable to other settings and have implications for clinical practice. 相似文献
255.
Hjelmeland H Nordvik H Bille-Brahe U De Leo D Kerkhof JF Lönnqvist J Michel K Renberg ES Schmidtke A Wasserman D 《Suicide & life-threatening behavior》2000,30(4):295-303
As part of the WHO/EURO Multicentre Study on Parasuicide, the level of suicide intent among female and male parasuicide patients from various European regions was compared. From nine regions, a total of 1,212 parasuicide patients, 752 females and 460 males, were included in the study. Although some statistical significant differences in level of suicide intent between the regions and genders were found, the effect sizes of these relationships were so small that the differences have neither theoretical nor practical significance. As far as level of suicide intent is concerned, the WHO study has succeeded in recruiting a relatively homogeneous group of self-harming patients across borders of region, culture, and country. 相似文献
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Personal computers allow multitasking among a greater variety of content than has ever been possible on a single device. We logged all switches made for 4 days for 30 people on personal computers used in natural environments. The median time before a switch occurred was 11 sec, shorter than previously observed. We also measured individual differences in appetitive versus defensive motivations to switch. Those people high on both motivations (Coactives) had the most switches per session. Risk takers had the shortest content segment lengths; risk avoiders and inactives were lower on the number of switches and anticipated arousal. Different patterns of content selection, in addition to switching behavior, were also observed for the different motivation activation groups. Results highlight how threads of experience that mix radically different short media segments may better define how people now search, process, and evaluate information. Implications in light of technological trends and individual differences are discussed. 相似文献
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Frances L. Lynch Patricia Himes Marian J. Gilmore Elissa M. Morris Jennifer L. Schneider Tia L. Kauffman Elizabeth Shuster Jacob A. Reiss John F. Dickerson Michael C. Leo James V. Davis Carmit K. McMullen Benjamin S. Wilfond Katrina A.B. Goddard 《Journal of genetic counseling》2018,27(4):823-833
Advances in technology and the promise of personalized health care are driving greater use of genome sequencing (GS) for a variety of clinical scenarios. As health systems consider adopting GS, they need to understand the impact of GS on the organization and cost of care. While research has documented a dramatic decrease in the cost of sequencing and interpreting GS, few studies have examined how GS impacts genetic counseling workloads. This study examined the time needed to provide genetic counseling for GS in the context of preconception carrier screening. Genetic counselors prospectively reported on the time spent in the results disclosure process with 107 study participants who were part of the NextGen study. We found that the median time for results disclosure was 64 min (ranged from 5 to 229 min). Preparation work was the most time-consuming activity. Qualitative data from journal entries, debrief interviews with genetic counselors, and detailed case conference notes provided information on factors influencing time for results disclosure and implications for practice. Results suggest that expanded carrier screening could require significant increases in genetic counseling time, unless we are able to generate new resources to reduce preparation work or develop other strategies such as the creation of new models to deliver this type of service. 相似文献
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Speer Stephanie R. Atteberry-Ash Brittanie Kattari Shanna K. Kattari Leo. Gupta Rohini Walls N. Eugene 《Journal of child and family studies》2022,31(4):1158-1171
Journal of Child and Family Studies - Non-suicidal self-injury (NSSI) is described as the intentional destruction of one’s own bodily tissue without lethal intent and is a common behavior... 相似文献