The History, Culture and Language of Koryŏ Saram

( Kim¸ German ) 서울대학교 규장각한국학연구원 1993 Seoul journal of Korean studies Vol.6 No.-

A Pilot Study of Percutaneous Interlaminar Endoscopic Lumbar Sequestrectomy: A Modern Strategy to Tackle Medically-Refractory Radiculopathies and Restore Spinal Function

Stefano Maria Priola,Mario Ganau,Giovanni Raffa,Antonino Scibilia,Faisal Farrash,Antonino Germanò 대한척추신경외과학회 2019 Neurospine Vol.16 No.1

Objective: Angled scopes allow 360° visualization, which makes percutaneous endoscopic techniques (percutaneous endoscopic lumbar discectomy, PELD) particularly attractive for sequestrectomies, which entail the removal of extruded lumbar disc fragments that have migrated caudally or cranially between the ligaments, foramina, and neural structures, while preserving the disc. Although many different PELD techniques are currently available, not all of them are suitable for sequestrectomies; furthermore, long-term follow-up data are unfortunately lacking. Methods: A pilot study was conducted on a cohort of 270 patients with lumbar radiculopathy undergoing minimally invasive spine surgery (PELD or microdiscectomy), of whom only 7 were eligible for endoscopic interlaminar sequestrectomy with disc preservation. The patients’ baseline conditions and clinical outcomes were measured with the Oswestry Disability Index and a visual analogue scale. Long-term follow-up was conducted using satisfaction questionnaires that were based on the MacNab criteria and administered by medical/nursing personnel not involved in their primary surgical management. Results: EasyGo system was eventually used in 5 PELD cases. No dural tears, infections, or nerve root injuries were recorded in patients undergoing sequestrectomy. Surgical events, including blood loss and overall length of hospital stay, did not differ significantly among the 270 patients. In the group treated with endoscopic sequestrectomy, no recurrences or complications were noted during a follow-up of 3 years, and an excellent degree of satisfaction was reported. Conclusion: We provide OCEBM (Oxford Centre for Evidence-Based Medicine) level 3 evidence that interlaminar endoscopic sequestrectomy is a tailored and well-tolerated surgical option; nonetheless, a cost-effectiveness analysis assessing the interval until return to working activities and long-term benefits is warranted.

Rapid Heating Concepts in Sintering

German, Randall M. The Korean Powder Metallurgy Institute 2013 한국분말재료학회지 (KPMI) Vol.20 No.2

Powder metallurgy applied rapid heating to sintering starting year 1900. Since 1970 the study has intensified. Now rapid sintering concepts embrace a spectrum of options ranging from dunk cycles to microwave, induction, exothermic, electric field, and spark approaches. Most of the efforts are targeting reduced microstructure coarsening during sintering, although reduced material decomposition is another common goal. The efforts are impressive for simple shapes and success metrics such a small grain size after densification. Several barriers need to be removed prior to application in powder metallurgy commercial sintering. Rapid heating research needs to focus on significant property gains, accurate product dimensions, and lower costs. So far each property gain obtained with rapid heating is matched by traditional sintering and composition changes. Several examples are cited to show the goals for the next round of innovations.

DIASPORA VS IRREDENTA IN THE POST SOVIET СENTRAL ASIA

German Kim 전남대학교 글로벌디아스포라연구소 2016 전남대학교 세계한상문화연구단 국제학술회의 Vol.2016 No.5

The collapse of the Soviet Union, the emergence of new sovereign states, the fragmentation of the single in the former time ethnic groups inhabiting a common country, the renaissance of ethnic identity, change by great part of Soviet peoples of their citizenship and loyalty to the newly established states, and so forth, became the reasons for the boom in the use of the word "Diaspora". Moreover, the Diaspora discourse went beyond the academic sphere, since it is not the term, but the word "Diaspora" that has been widely used throughout the media, culture, NGOs and in everyday life. Often some ethnic minority is called Diaspora actually not being it. In my opinion, this dissonance has occurred because Diaspora is not distinguished from other ethnic groups. Frequently ethnic Diasporas have been put in one row along with immigrant communities. In some cases an ethnic community is perceived as a Diaspora, though it is actually an Irredenta, which is on the one hand, different from the former, and on the other - has similarities with it. The fundamental difference between Irredenta and Diaspora lies in dissimilar attitude to the residing area, the first one pretends to be aborigine and the latter has a kin state from where their ancestors migrated to the host country. Many scholars understand irredentism as an attempt by a sovereign state to incorporate the territories of ethnically related populations in neighboring countries. Yet there are disagreements on how exactly to define irredentism. In the case of ethno-territorial cross-border conflicts, irredentist and secessionist movements often coincide. The purpose of my presentation is threefold: firstly, to define the basic concepts of Diaspora and Irrendenta, to show typological similarities and differences between two ethnic groups living outside their historical homeland. Secondly, to use chronotopical method which takes into account not only territorial but also the temporal dimensions of the Diaspora and Irredenta as different, but in many ways similar spatio-temporal models. Thirdly, to give examples of Irrendentism trends in the post-Soviet Central Asia showing how territorial disputes can cause bloody ethnic conflicts in the border areas.

Design rules for creating sensing and self-actuating microcapsules

German V. Kolmakov,Anna C. Balazs,Victor V. Yashin 국제구조공학회 2011 Smart Structures and Systems, An International Jou Vol.7 No.3

Using computational modeling, we design a pair of biomimetic microcapsules that exploit chemical mechanisms to communicate and alter their local environment. As a result, these synthetic objects can undergo autonomous, directed motion. In the simulations, signaling microcapsules release “agonist” particles, while target microcapsules release “antagonist” particles and the permeabilities of both capsule types depend on the local particle concentration in the surrounding solution. Additionally, the released nanoscopic particles can bind to the underlying substrate and thereby create adhesion gradients that propel the microcapsules to move. Hydrodynamic interactions and the feedback mechanism provided by the dissolved particles are both necessary to achieve the cooperative behavior exhibited by these microcapsules. Our model provides a platform for integrating both the spatial and temporal behavior of assemblies of “artificial cells”,and allows us to design a rich variety of structures capable of exhibiting complex dynamics. Due to the celllike attributes of polymeric microcapsules and polymersomes, material systems are available for realizing our predictions.

Asset correlations in turbulent markets and their implications on asset management

German Bernhart,Stephan Hocht,Michael Neugevauer,Michael Neumann 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10

In this article, the dependence structure of the asset classes stocks, government bonds and corporate bonds in different market environments and its implications on asset management are investigated. Asset returns are modelled by a Markov-switching model which allows for two market regimes with completely different risk-return structures. Using major stock indices, calm and turbulent market periods are identified for the time period between 1987 and 2009 and the correlation structures in the respective periods are compared. It turns out that the correlations between as well as within the asset classes under investigation are far from being stable and vary significantly between calm and turbulent market periods as well as time. Finally, the impact of these findings is examined in a portfolio optimization context. To accomplish this, a case study using the mean-variance and the mean-conditional-value-at-risk framework as well as two levels of risk aversion is conducted. The results show that an explicit consideration of different market conditions in the modelling framework yields better portfolio performance as well as lower portfolio risk compared to standard approaches. These findings hold true for all investigated optimization frameworks and risk-aversion levels.

Typology of Soil-Ecological Risks for Desertification

German Kust,Sergey Rozov,Olga Andreeva,Nina Kutuzova,Tatyana Trifonova 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.6

Movimientos Sociales y Reformas Electorales

German Perez Fernandez del Cas(헤르만 페레스 페르난데스 델 카스티요) 한국라틴아메리카학회 2009 라틴아메리카연구 Vol.22 No.2

Adult pancreatoblastoma: A rare malignant tumor of the pancreas

German Esteban Sanchez Morales,Hillary Lizarraga Payan,Roberto Andre Moguel Valladare,Ismael Dominguez Rosado,Carlos Chan 한국간담췌외과학회 2021 Annals of hepato-biliary-pancreatic surgery Vol.25 No.3

Pancreatoblastoma (PB) is a rare malignant tumor in adults. It has an overall incidence of 0.004 per 100,000 inhabitants. Its diagnosis with fine-needle aspiration (FNA) is difficult due to multiple differentiation lines present on PB that overlap with other tumors. A 76-year-old male patient presented with jaundice, weight loss of 10 kg in 6 months, and appetite loss. Abdominal computed tomography scan showed a tumor in the pancreas head. Transendoscopic ultrasound with FNA biopsy revealed a malignant epithelial neoplasia compatible with PB with immunohistochemistry CK19 (+), P63(+), synaptophysin (–), and Ki67 50%. The patient underwent surgical resection and adjuvant chemotherapy. Currently, the patient is in follow-up with the latest imaging showing no evidence of disease at 32 months after his initial diagnosis. PB is an uncommon malignant neoplasia with an aggressive behavior. Its diagnostic and therapeutic protocols are unclear. Its preoperative diagnosis may be difficult since its imaging features and serological markers are non-specific. However, FNA may be useful in some situations. Surgical resection is currently the recommended treatment that is associated with the best long-term survival.

Dynamic Effects of MERCOSUR: An Assessment for Argentina

( German Calfat ),( Renato G. Flores Jr. ),( Maria Florencia Granato ) 세종대학교 경제통합연구소 2003 Journal of Economic Integration Vol.18 No.3

We evaluate the potential dynamic effects of MERCOSUR on the Argentinean economy. Two approaches, already used with other regional integration agreements, are applied for measuring medium and long-term effects. Special care has been taken in separating intra from extra zone effects. All estimations are carefully checked and have their magnitudes contrasted with other figures derived from different sources. Besides, complementary empirical assessments are done. The diverse empirical evidences found support the argument that Argentina experienced growth effects due to MERCOSUR.