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SOME CURRENT ISSUES IN GALAXY FORMATION
Silk, Joseph The Korean Astronomical Society 2010 天文學論叢 Vol.25 No.3
The origin of the galaxies represents an important focus of current cosmological research, both observational and theoretical. Its resolution involves a comprehensive understanding of star formation and evolution, galaxy dynamics, supermassive black holes, and the cosmology of the very early universe. In this paper, I will review our current understanding of galaxy formation and review some of the challenges that lie ahead. Specific issues that I address include the galaxy luminosity function, feedback by supernovae and by AGN, and downsizing. I argue that current evidence favours two distinct modes of star formation in the early universe, in order to account for the origin of disk and massive spheroidal galaxies. However perhaps the most urgent need is for a robust theory of star formation.
Partial Credibility, Information Selection and the Signalling Channel of Sterilized Interventions
( Silke Fabian Reeves ) 세종대학교 경제통합연구소 (구 세종대학교 국제경제연구소) 1998 Journal of Economic Integration Vol.13 No.1
The signalling channel suggests that central banks use sterilized interventions in the foreign exchange market to convey information about future monetary policy to the market. To date, this theory is not sufficiently supported by theoretical work that establishes the link between intervention signals and exchange rates. This paper develops a two country model of sterilized interventions. I argue that reputational effects cannot eliminate the credibility problem between central banks and the private sector and that agents will only partially use available information to form exchange rate expectations. Both partial credibility and non-rational expectations reduce the effectiveness of interventions. (JEL Classifications: E52, F31, F41)
PSEN1 p.Met233Val in a Complex Neurodegenerative Movement and Neuropsychiatric Disorder
Silke Appel-Cresswell,Ilaria Guella,Anna Lehman,Dean Foti,Matthew J. Farrer 대한파킨슨병및이상운동질환학회 2018 Journal Of Movement Disorders Vol.11 No.1
Mutations in presenilin 1 (PSEN1) are the most common cause of autosomal dominant Alzheimer’s disease. Here, we report a Canadian-Vietnamese family carrying a PSEN1 p.Met233Val mutation with an exceptionally early and severe presentation that includes a wide range of atypical symptoms, including prominent ataxia, Parkinsonism, spasticity, dystonia, action tremor, myoclonus, bulbar symptoms, seizures, hallucinations and behavioral changes. Whole-exome sequencing (WES) was performed on the affected proband after many assessments over several years proved diagnostically inconclusive. The results were analyzed using the AnnEx “Annotated Exomes” browser (http://annex.can.ubc.ca), a web-based platform that facilitates WES variant annotation and interpretation. High-throughput sequencing can be especially informative for complex neurological disorders, and WES warrants consideration as a first-line clinical test. Data analyses facilitated by web-based bioinformatics tools have great potential for novel insight, although confirmatory, diagnostically accredited Sanger sequencing is recommended prior to reporting.
Project Life INSUSHELL: Reducing the Carbon Footprint in Concrete Construction
Tomoscheit, Silke,Gries, Thomas,Horstmann, Michael,Hegger, Josef Sustainable Building Research Center 2011 International journal of sustainable building tech Vol.2 No.2
Within the Life INSU-SHELL project (Environmentally Friendly fa$\c{c}$ade Elements made of thermal insulated Textile Reinforced Concrete) RWTH Aachen University together with industrial partners developed and implemented an innovative and eco friendly modular system for sandwich fa$\c{c}$ades. The thin-walled, light-weight sandwich structure combines Textile Reinforced Concrete (TRC) and a PUR-rigid-foam-insulation. With the use of TRC a large quantity of concrete material and therefore $CO_2$-output can be avoided. The lower amount of concrete used in the new elements results in a reduction of $CO_2$-output of about 70% in comparison to a similar element of ferroconcrete. The lower weight saves energy and fuel. Moreover it reduces the pollutant emission in transport and application. The employment of the innovative elements at the new INNOTEX building (ITA: Institut fuer Textiltechnik of RWTH Aachen University) with a fa$\c{c}$ade size of about $590\;m^2$ saved large quantities of $CO_2$-output in comparison to conventional building techniques.
Partial Credibility, Information Selection and the Signalling Channel of Sterilized Interventions
Reeves, Silke Fabian 세종대학교 국제경제연구소 1998 Journal of Economic Integration Vol.13 No.1
The signalling channel suggests that central banks use sterilized interventions in the foreign exchange market to convey information about future monetary policy to the market. To date, this theory is not sufficiently supported by theoretical work that establishes the link between intervention signals and exchange rates. This paper develops a two country model of sterilized interventions. I argue that raputational effects cannot eliminate the credibility problem between central banks and the private sector and that agents will only partially use available information to form exchange rate expectations. Both partial credibility and non-rational expectations reduce the effectiveness of intervention.(JEL Classification: E52, F31, F41)
이정식(Jeong-Silk Lee),최현철(Hyun-Chul Choi) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.8
영어 폰트는 대소문자를 포함해 52 자만 만들면 되는 반면에, 한글 폰트는 자모음의 조합으로 11,172 자를 디자인해야 하기 때문에 새로운 한글 폰트를 만드는 작업에는 많은 시간과 노동력이 필요하다. 이를 해결하기 위해 자동 폰트 생성 방법들이 제안되었으나, 대부분 GAN 기반의 접근방법으로 네트워크 학습이 불안정한 문제가 있으며, 또한 새로운 스타일 폰트 생성을 위해 네트워크를 매번 다시 학습해야 하는 번거로움이 있다. 본 논문에서는 이런 어려움을 해결하고자 영상 스타일 변형 네트워크에 기반한 한글 폰트 생성 방법을 제안한다. 제안 방법은 인코더—트랜스포머—디코더 구성의 네트워크를 사용하여 기존의 GAN 기반 방법이 가진 학습 불안정성을 극복하고 임의 폰트를 생성한다. 또한 콘텐츠와 스타일의 인코더를 분리한 뒤 스타일 인코더를 미세 조정하는 과정을 통해 생성된 폰트의 품질을 향상시킨다. 己口 결과로부터 제안 방법의 임의 폰트 생성 결과가 우수함을 보인다.
Song, Young-Silk,Song, Jerng-Sik,Park, Yoon The Korean Ceramic Society 1998 The Korean journal of ceramics Vol.4 No.1
Diamond-like carbon(DLC) films were deposited on buffer-layered ZnS substrates by radio frequency plasma enhanced chemical vapor deposition(RF-PECVD) method. Ge and GeC buffer layera were used between DLC and ZnS substrates to promote the adhesion of DLC on ZnS substrates. Ge buffer layers were sputter deposited by RF magnetron sputtering and $GeC^1$ buffer layers were deposited by same method except using acetylene reactive gas. The relatinship between film properties and deposition conditions was investigated using gas pressure, RF power and dc bias voltage as PECVD parameters. The hardness of DLC films were measured by micro Vickers hardness test and the adhesion of DLC films on buffer-layered ZnS substrates were studied by Sebastian V stud pull tester. The optical properties of DLC films on butter-layered ZnS substrates were characterized by ellipsometer and FTIR spectroscopy.