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( Thilo Gambichler ),( Rebecca Matip ) 대한피부과학회 2012 Annals of Dermatology Vol.24 No.2
Essential thrombocythemia (ET) is a clonal stem cell disease characterized by isolated thrombocytosis and thrombohemorrhagic complications. We describe an unusual case of ET primarly presenting with skin symptoms including erythromelalgia and livedo reticularis (racemosa-type). Persistent thrombocytosis, bone marrow findings, JAK2 gene mutation, and markedly decreased ristocetin-cofactor activity were consistent with the diagnosis of ET and acquired von Willebrand disease. Elevated antiphospholipid antibodies were also found. The present case highlights the complex nature and diagnostic challenge of myeloproliferative disorders such as ET, which can involve multiple organ systems and often shows a variety of microvascular complications, coagulation anomalies, and autoimmune phenomena. (Ann Dermatol 24(2) 214∼217, 2012)
MULTICOMPLEXES, BOUNDED COHOMOLOGY AND ADDITIVITY OF SIMPLICIAL VOLUME
Thilo Kuessner 대한수학회 2015 대한수학회보 Vol.52 No.6
We discuss some additivity properties of the simplicial volume for manifolds with boundary: we give proofs of additivity for glueing amenable boundary components and of superadditivity for glueing amenable submanifolds of the boundary, and we discuss doubling of 3- manifolds.
Thilo Lang,Robert Nadler 한국노동연구원 2015 국제노동브리프 Vol.13 No.8
초국가적 프로젝트“ 리턴(Re-Turn)”의 컨소시엄에서는 유럽 내 귀환 이주 분야에 대한 연구를 실시하였다. 기존의 귀환 대책에 관한 문헌 연구, 1,913명의 중부유럽 이주노동자를 대상으로 한 온라인 여론조사, 중부유럽 비도시 지역의 기업 및 기업연합 대표 109명과의 면담 내용을 바탕으로, 리턴 프로젝트의 파트너들은 귀환 이주 지원 대책을 수립하고 개선하기 위한 제안들을 구체화하였다. 이 글은 리턴 컨소시엄이 실시한 연구의 주요 결과들을 소개한다. 귀환 이주 지원대책이 해외에 있는 대상 집단에 전달되도록 하고 성공적인 귀환 이주노동자들의 긍정적 경험을 귀환을 희망하는 이주노동자들에게 널리 알리기 위해서는 더욱 효율적인 정보전달 전략이 필요하다는 주장이 제기되었다. 또한 사용자들도 귀환 대책에 참여하여야 이주노동자들이 귀환 후에 출신지역의 노동시장에 안정적으로 재편입될 수 있다. 끝으로, 정책 입안자들과 이해관계자들이 귀환 이주 정책을 수립하고자 할 때에는, 이주의 순환성 증가와 함께, 귀환 이주노동자들에게 긍정적 차별로 작용하는 귀환 대책의 규범적 측면을 고려해야 한다.
Cutting mechanism and surface integrity in milling of Ti-5553 processed by selective laser melting
Thilo Grove,Berend Denkena,Oliver Maiß,Alexander Krödel,Holger Schwab,Uta Kühn 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.10
Titanium alloys are of significant importance in several high performance applications such as aerospace components or medical implants. Advances in additive technologies lead to an increase of additively built workpieces, offering new possibilities regarding functional integration and lightweight structures. Several authors have shown that microstructural, mechanical and thermal material properties differ significantly from those of cast alloys. Although additively produced parts are near net-shape, most of them are machined after the building process, to achieve the requirements regarding surface finish and dimensional accuracy. Titanium is generally known as a hardto-cut material due to its thermo-mechanical properties. Although there is a profound knowledge about the machinability of conventionally cast and wrought titanium alloys, there is a lack of understanding regarding the machining of additively built titanium. In this paper, the machinability of an additively built Ti-5Al-5V-5Mo-3Cr alloy (Ti-5553) is analyzed regarding chip formation, cutting forces and tool wear. Three different generation methods, conventional wrought, selective laser melting and selective laser melting with in-process (insitu) heat treatment are investigated. It is shown that the machinability differs significantly compared to a conventional wrought alloy, which is linked to decreased contact length on the tool rake face and higher mechanical tool load (up to + 23 % force increase). Highest tool load is found for titanium alloy, which is built using selective laser melting and in-process heat treatment. Furthermore, the surface integrity after machining is analyzed regarding hardness, roughness and residual stresses. Hereby, high compressive residual stresses for additively built titanium with in-process heat treatment are obtained due to the higher mechanical tool load. Therefore, it could be shown that the generation method (e.g. selective laser melting) needs to be considered for the later process design in finish machining.
MULTICOMPLEXES, BOUNDED COHOMOLOGY AND ADDITIVITY OF SIMPLICIAL VOLUME
KUESSNER, THILO Korean Mathematical Society 2015 대한수학회보 Vol.52 No.6
We discuss some additivity properties of the simplicial volume for manifolds with boundary: we give proofs of additivity for glueing amenable boundary components and of superadditivity for glueing amenable submanifolds of the boundary, and we discuss doubling of 3-manifolds.