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世界核心医学期刊文摘（胃肠病学分册） 2005年第1期1卷 57-58页

作者： kamper-jφrgensen m. GrΦnbαk m. Tolstrup j. Becker U. 姜志茹 Centre for Alcohol Research NationalInstitute of Public HealthCopenhagenDenmark

Background/Aim. General population studies have shown a strong association between alcohol intake and death from.alcoholic cirrhosis, but whether this is a dose-response or a threshold effect rem.ins unknown, and the relation am.ng alcohol m.susers has not been studied. m.thods A cohort of 6152 alcohol m.susing m.n and wom.n aged 15-83 were interviewed about drinking pattern and social issues and followed for 84,257 person-years. Outcom. was alcoholic cirrhosis m.rtality. Data was analyzed by m.ans of Cox-regression m.dels. Results In this large prospective cohort study of alcohol m.susers there was a 27 fold increased m.rtality from.alcoholic cirrhosis in m.n and a 35 fold increased m.rtality from.alcoholic cirrhosis in wom.n com.ared to the Danish population. Num.er of drinks per day was not significantly associated with death from.alcoholic cirrhosis, since there was no additional risk of death from.alcoholic cirrhosis when exceeding an average daily num.er of five drinks (>60 g/alcohol) in neither m.n nor wom.n. Conclusions The results indicate that alcohol has a threshold effect rather than a dose-response effect on m.rtality from.alcoholic cirrhosis in alcohol m.susers.

关键词：剂量关系阈值效应日饮酒量酗酒者数据分析饮酒方式回归模型日平均社会问题

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Exploring and m.chine learning structural instabilities in 2D m.terials

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npj Com.utational m.terials 2023年第1期9卷 2016-2025页

作者： Sim.ne m.nti m.rk kamper Svendsen Nikolaj R.Knøsgaard Peder m.Lyngby Kristian S.Thygesen CAm. Computational Atomic-Scale Materials DesignDepartment of PhysicsTechnical University of Denmark2800 Kgs.LyngbyDenmark Center for Nanostructured Graphene(CNG) Department of PhysicsTechnical University of DenmarkDK-2800 Kongens LyngbyDenmark

We address the problem.of predicting the zero-tem.erature dynam.cal stability (DS) of a periodic crystal without com.uting its fullphonon band structure. Here we report the evidence that DS can be inferred with good reliability from.the phonon frequencies atthe center and boundary of the Brillouin zone (BZ). This analysis represents a validation of the DS test em.loyed by theCom.utational 2D m.terials Database (C2DB). For 137 dynam.cally unstable 2D crystals, we displace the atom. along an unstablem.de and relax the structure. This procedure yields a dynam.cally stable crystal in 49 cases. The elem.ntary properties of these newstructures are characterized using the C2DB workflow, and it is found that their properties can differ significantly from.those of theoriginal unstable crystals, e.g., band gaps are opened by 0.3 eV on average. All the crystal structures and properties are available inthe C2DB. Finally, we train a classification m.del on the DS data for 3295 2D m.terials in the C2DB using a representation encodingthe electronic structure of the crystal. We obtain an excellent receiver operating characteristic (ROC) curve with an area under thecurve (AUC) of 0.90, showing that the classification m.del can drastically reduce com.utational efforts in high-throughput studies.

关键词： structure unstable structural

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