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Photometric Defocus Observations of Transiting Extrasolar Planets
Tobias C. Hinse,Wonyong Han,Joh-Na Yoon,Chung-Uk Lee,Yong-Gi Kim,Chun-Hwey Kim 한국우주과학회 2015 Journal of Astronomy and Space Sciences Vol.32 No.1
We have carried out photometric follow-up observations of bright transiting extrasolar planets using the CbNUOJ 0.6 m telescope. We have tested the possibility of obtaining high photometric precision by applying the telescope defocus technique, allowing the use of several hundred seconds in exposure time for a single measurement. We demonstrate that this technique is capable of obtaining a root-mean-square scatter of sub-millimagnitude order over several hours for a V ~10 host star, typical for transiting planets detected from ground-based survey facilities. We compared our results with transit observations from a telescope operated in in-focus mode. High photometric precision was obtained due to the collection of a larger amount of photons, resulting in a higher signal compared to other random and systematic noise sources. Accurate telescope tracking is likely to further contribute to lowering systematic noise by exposing the same pixels on the CCD. Furthermore, a longer exposure time helps reduce the effect of scintillation noise which otherwise has a significant effect for small-aperture telescopes operated in in-focus mode. Finally we present the results of modelling four light-curves in which a root-mean-square scatter of 0.70 to 2.3 milli-magnitudes was achieved.
Control Allocation for Double-ended Ferries with Full-scale Experimental Results
Tobias R. Torben,Astrid H. Brodtkorb,Asgeir J. Sørensen 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.3
A novel control allocation algorithm for double-ended ferries with symmetrical thruster configuration is proposed. The allocation problem is formulated using the extended thrust representation, resulting in a four dimensional constrained optimization problem. Using the thrust configuration constraint, the optimization problem is reduced to a scalar bounded optimization problem, for which there exists fast solvers. We propose a cost function and bounds such that the allocation algorithm supports the standard way of performing manual thruster control on ferries. The real-time performance of the proposed algorithm is demonstrated in a simulation study, and in full-scale experiments.
HOW ONLINE CUSTOMER REVIEWS AFFECT SALES AND RETURNS IN FASHION
Tobias Maximilian Lohse,Jan Kemper,Malte Brettel 글로벌지식마케팅경영학회 2017 Global Fashion Management Conference Vol.2017 No.07
The goal of this study is to get a better understanding of the relationship between online customer reviews (OCRs), product returns and sales after returns in online fashion. Furthermore, we generate deeper insights about the moderating role of mobile shopping usage, product involvement and brand equity in this context. We answer our research questions by empirically analyzing a unique data set from a European fashion e-commerce company. This study links a wide range of transaction data (2.5 billion page clicks, 46 thousand different products, 700 brands, 40 product categories, 72 million sold and 33 million returned items) with a large set of OCRs (0.9 million). Our results show that positive OCRs can lead to higher sales, lower returns, and better conversion rates. Considering higher search costs on mobile devices, we reveal a weaker impact of OCRs in the mobile than in the desktop sales channel. Furthermore, in line with involvement theory, we see a significant impact of product involvement in this context such as the influence of positive OCRs is stronger for high-involvement products than vice versa. Moreover, we find strong support for statements from brand signaling literature, that OCRs matter more for weak than for strong brands.
Tobias Graf,Jan-Frederik Güth,Christian Diegritz,Anja Liebermann,Josef Schweiger,Oliver Schubert 대한치과보철학회 2021 The Journal of Advanced Prosthodontics Vol.13 No.6
PURPOSE. The aim of this study was to evaluate the efficiency of occlusal and interproximal adjustments of single implant crowns (SIC), comparing a digital cast-free approach (CF) and a protocol using 3D printed casts (PC). MATERIALS AND METHODS. A titanium implant was inserted at position of lower right first molar in a typodont. The implant position was scanned using an intraoral scanner and SICs were fabricated accordingly. Ten crowns (CF; n = 10) were subject to a digital cast-free workflow without any labside occlusal and interproximal modifications. Ten other identical crowns (PC) were adjusted to 3D printed casts before delivery. All crowns were then adapted to the testing model, simulating chair-side adjustments during clinical placement. Adjustment time, quantity of adjustments, and contact relationship were assessed. Data were analyzed using SPSS software (P < .05). RESULTS. Median and interquartile range (IQR) of clinical adjustment time was 02:44 (IQR 00:45) minutes in group CF and 01:46 (IQR 00:21) minutes in group PC. Laboratory and clinical adjustment time in group PC was 04:25 (IQR 00:59) minutes in total. Mean and standard deviation (±SD) of root mean squared error (RMSE) of quantity of clinical adjustments was 45 ± 7 μm in group CF and 34 ± 6 μm in group PC. RMSE of total adjustments was 61 ± 11 μm in group PC. Quality of occlusal contacts was better in group CF. CONCLUSION. Time effort for clinical adjustments was higher in the cast-free protocol, whereas quantity of modifications was lower, and the occlusal contact relationship was found more favourable.
Data on Early Child Education and Care Learning Environments in Germany
Tobias Linberg,Thomas Baeumer,Hans-Guenther Rossbach 육아정책연구소 2013 International Journal of Child Care and Education Vol.7 No.1
Early child education and care (ECEC) learning environments play an important role in children’s developmental status and educational outcomes as international research has shown. However, the data basis for analyzing the effects of learning environments on children’s competencies and educational trajectories has been rather sparse in Germany. The National Educational Panel Study (NEPS) has been set up in order to contribute to filling this gap. The main task of the NEPS is to prepare Scientific Use Files that are disseminated to the scientific community. Because all NEPS data and documentation are translated and available to the international scientific community, the aim of this paper is threefold: After giving an introduction to the field of research and discussing the objectives and legislative characteristics of the German ECEC system, we present an overview on the sections of the NEPS that survey children 2 years before regular school enrollment and the ECEC characteristics they experience. On the basis of first-wave data, we deliver some first results on how children in Germany are cared for within the German ECEC system. The paper ends with a discussion on further possible contributions, especially when longitudinal data are being made available by the NEPS for quantitative educational research and evidence-based political decision making.
Tobias C. Hinse,김우균,안상현,이재근,박준형,이영우,정우정,우상민 한국천문학회 2017 天文學論叢 Vol.32 No.3
We give a detailed description of the installation and operation of a double-station meteor detectionsystem which formed part of a research & education project between Korea Astronomy Space ScienceInstitute (KASI) and Daejeon Science Highschool. A similar system is currently not existing in SouthKorea. A total of six light-sensitive CCD cameras were installed with three cameras at SOAO and threecameras at BOAO observatory. A double-station observation of a meteor event enables the determinationof the three-dimensional heliocentric orbit in space. This project was initiated in response to the Jinjureball event in March 2014. The cameras were installed in October/November 2014. The two stationsare identical in hardware as well as software. Each station employes sensitive \Watec-902H2" cameras incombination with relatively fast f/1.2 lenses. Various elds of views were used for measuring di erencesin detection rates of meteor events. We employed the SonotaCo UFO software suite for meteor detectionand their subsequent analysis. The system setup as well as installation/operation experience is describedand rst results are presented. We also give a brief overview of historic as well as recent meteor (fall)detections in South Korea. For more information please consult http://meteor.kasi.re.kr.