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Process Simulation of Aluminium Sheet Metal Deep Drawing at Elevated Temperatures
Johannes Winklhofer,Gernot Trattnig,Christoph Lind,Christof Sommitsch,Hannes Feuerhuber 한국소성가공학회 2010 기타자료 Vol.2010 No.6
Lightweight design is essential for an economic and environmentally friendly vehicle. Aluminium sheet metal is well known for its ability to improve the strength to weight ratio of lightweight structures. One disadvantage of aluminium is that it is less formable than steel. Therefore complex part geometries can only be realized by expensive multi-step production processes. One method for overcoming this disadvantage is deep drawing at elevated temperatures. In this way the formability of aluminium sheet metal can be improved significantly, and the number of necessary production steps can thereby be reduced. This paper introduces deep drawing of aluminium sheet metal at elevated temperatures, a corresponding simulation method, a characteristic process and its optimization. The temperature and strain rate dependent material properties of a 5xxx series alloy and their modelling are discussed. A three dimensional thermomechanically coupled finite element deep drawing simulation model and its validation are presented. Based on the validated simulation model an optimised process strategy regarding formability, time and cost is introduced.
Johannes Hausmann,Andrea Tal,Artur Gomer,Michael Philipper,Gero Moog,Horst Hohn,Norbert Hesselbarth,Harald Plass,Jörg Albert,Fabian Finkelmeier 대한소화기내시경학회 2021 Clinical Endoscopy Vol.54 No.1
Background/Aims: Reliable and especially widely accepted preventive measures are crucial to further reduce the incidenceof colorectal cancer (CRC). Colon capsule endoscopy (CCE) might increase the screening numbers among patients unable orunwilling to undergo conventional colonoscopy. This registry trial aimed to document and determine the CCE indications, findings,complications, and adverse events in outpatient practices and clinics throughout Germany. Methods: Patients undergoing CCE between 2010 and 2015 were enrolled in this prospective multicenter registry trial at six Germancenters. Patient demographics, outcomes, and complications were evaluated. Results: A total of 161 patients were included. Of the CCE evaluations, 111 (68.9%) were considered successful. Pathological findingsin the colon (n=92, 60.1%) and in the remaining gastrointestinal tract (n=38, 24.8%) were recorded. The main finding was thepresence of polyps (n=52, 32.3%). Furthermore, five carcinomas (3.1%) were detected and histologically confirmed later. Adequatebowel cleanliness was more likely to be achieved in the outpatient setting (p<0.0001). Interestingly, 85 patients (55.6%) chose toundergo CCE based on personal motivation. Conclusions: CCE seems to be a reliable and safe endoscopic tool for screening for CRC and detecting other diseases. Its patientacceptance and feasibility seems to be high, especially in the outpatient setting.
Globalizing Social Welfare and Labor Markets in East and Southeast Asia
Johannes Dragsbaek Schmidt 한국사회학회 2007 한국사회학회 기타간행물 Vol.- No.-
The current neo-liberal regime of global accumulation has aimed at transforming internal industrial divisions of labor from being part of a national structure of accumulation to becoming a component element in the international division of labor and accumulation process in the world economy. The contradiction that thus arises is whether capital accumulation is embedded in the national economy to the benefit of society or serves the interests of external actors and interests as well as internal comprador elements. In recent times, due to various evolutions, the United States and the European Union have experienced social pressures for restricting the workings of globalization: The first is the fear of job losses through the mechanisms of outsourcing and imports of cheapers industrial products. The second is the anxiety of ethnic and cultural dilution due to the emergence of new patters of labor migration and the reconfiguration of labor markets where the twin-effect of flexibility and informalization affects both society and politics. This situation is to a lesser degree mirrored in East and Southeast Asia where the question is whether the challenges of globalization will lead to a new social compact where state, capital and workers negotiate for the promotion of national development and the creation of a civil society which might minimize the adverse effects of globalization! This paper explores the impact of neo-liberal globalization on labor markets and social welfare in East and Southeast Asia. It draws upon recent debates in the framework of comparative political economy over the impact of nee-liberal globalization on labor market regulation and social welfare adjustment. The focus is on the radical change of work arrangements with an accompanying loss of the social relevance of the work place and of labour-based social organisations. Another aspect is the extent of so-called "a-typical" work such as part time employment and fixed term contracts. A third impact is the overall change of social welfare from a cohesive compact to a more loose type of organization.
Johannes Kaesmacher,Nuran Abdullayev,Basel Maamari,Tomas Dobrocky,Jan Vynckier,Eike I. Piechowiak,Raoul Pop,Daniel Behme,Peter B. Sporns,Hanna Styczen,Pekka Virtanen,Lukas Meyer,Thomas R. Meinel,Danie 대한뇌졸중학회 2021 Journal of stroke Vol.23 No.1
Background and Purpose: Data on safety and efficacy of intra-arterial (IA) fibrinolytics as adjunct to mechanical thrombectomy (MT) are sparse. Methods: INtra-arterial FIbriNolytics In ThrombectomY (INFINITY) is a retrospective multi-center observational registry of consecutive patients with anterior circulation large-vessel occlusion ischemic stroke treated with MT and adjunctive administration of IA fibrinolytics (alteplase [tissue plasminogen activator, tPA] or urokinase [UK]) at 10 European centers. Primary outcome was the occurrence of symptomatic intracranial hemorrhage (sICH) according to the European Cooperative Acute Stroke Study II definition. Secondary outcomes were mortality and modified Rankin Scale(mRS) scores at 3 months. Results: Of 5,612 patients screened, 311 (median age, 74 years; 44.1% female) received additional IA after or during MT (194 MT+IA tPA, 117 MT+IA UK). IA fibrinolytics were mostly administered for rescue of thrombolysis in cerebral infarction (TICI) 0-2b after MT (80.4%, 250/311). sICH occurred in 27 of 308 patients (8.8%), with an increased risk in patients with initial TICI0/1 (adjusted odds ratio[aOR], 2.3; 95% confidence interval [CI], 1.1 to 5.0 per TICI grade decrease) or in those with intracranial internal carotid artery occlusions (aOR, 3.7; 95% CI, 1.2 to 12.5). In patients with attempted rescue of TICI0-2b and available angiographic follow-up, 116 of 228 patients (50.9%) showed any angiographic reperfusion improvement after IA fibrinolytics, which was associated with mRS ≤2 (aOR, 3.1; 95% CI, 1.4 to 6.9). Conclusions: Administration of IA fibrinolytics as adjunct to MT is performed rarely, but can improve reperfusion, which is associated with better outcomes. Despite a selection bias, an increased risk of sICH seems possible, which underlines the importance of careful patient selection.
The value of sub-national data: The dynamics of contentious politics in Nepal
Johannes Vüllers,Belén González 한국외국어대학교 국제지역연구센터 2020 International Area Studies Review Vol.23 No.3
Over the last decade, a renewed interest in the empirical analysis of contentious politics has led to significant improvements in the quality and quantity of data. The related wave of research has thus turned to analysis of the dynamics of contentious politics from a comparative perspective. Unfortunately, these studies use country level datasets for their analysis, creating a mismatch between the original actor-based theoretical framework and the empirical conceptualization of contentious collective action. We discuss the conceptual challenges this theoretical-empirical gap generates and highlight how contentious dynamics can be studied with a bottom-up subnational approach. To do so, we present a new fine-grained dataset of contentious collective action in post-conflict Nepal (2007 to 2010). We descriptively show how this type of data can help us improve our understanding of repertoires of contentious politics. This paper highlights the relevance of gathering information on active organizations to study the inherent dynamics of contentious politics.