Reflection on the Use of Blended Learning at a Korean University

( Katie Mae Klemsen ),( Myeong Hee Seong ) 범태평양응용언어학회 2012 범태평양응용언어학회지 Vol.16 No.2

The purpose of this study was to examine students`` satisfaction and investigate the potential of improved learning outcomes in smart and blended learning environments. This paper reflects on the experience of the delivery of a program at H University in Seoul, Korea using smart and blended learning. The goal was to apply the findings to current blended learning models in order to explore possible modifications that may enhance learning environments for Korean university students. The participants were 19 students enrolled in an English Language major course, Speaking 2: Presentation, which aimed to teach students to deliver oral presentations in English. Data was collected from student questionnaires, the smart/blended learning platform English 360, and an instructor reflection journal in order to address the following research questions: 1) What are the students`` perceptions of smart/blended learning environments?; 2) What are the benefits of smart/blended learning environments?; and 3) What are the drawbacks of smart/blended learning environments? The analysis of the data indicated that the overall student perception of smart and blended learning environments is positive. In addition, students`` perception of the course content influenced their interest in smart and blended learning environments. One of the primary findings was the importance of clear and transparent communication and organization of a smart and blended learning environment. Students indicated that they would be interested in additional courses that utilized smart/blended environments.

Anomalous, Dual Left Coronary System: an Exceedingly Rare Variant

Katy M. Reichlin,Hampton A. Crimm 한국심초음파학회 2020 Journal of Cardiovascular Imaging (J Cardiovasc Im Vol.28 No.1

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Effect of sintering temperature on the properties of GDC-LSCF composites

Kati Raju,Seyoung Kim,ChoiJaeHyung,JiHaengYu,Young-Hoon Seong,Soo-Hyun Kim,In-Sub Han 한국에너지학회 2018 한국에너지공학회 학술발표회 Vol.2018 No.11

Homogeneous distribution and quantitative evaluation of sintering additives in spray-dried silicon nitride granules

Kati Raju,Tae-Gyeong Kim,Hyun-Kwuon Lee 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.2

Quantitative phase evaluation of sintering additives and their homogeneous distribution in ceramics are critical issues inceramic processing. In the present work, we report the characteristics of silicon nitride granules containing sintering additives(Y2O3Al2O3Yb2O3) prepared by spray drying. For homogeneous mixing of sintering additives, using fine and similar particlesizes for all sintering additives is essential. In this study, the particle size was reduced by ball milling based on the particle sizeof the as-received sintering additive. Systematic studies using scanning electron microscopy and particle size analysis wereconducted on starting materials and spray-dried granules. Highly stable aqueous slurries consisting of 25 vol.% of siliconnitride particles, 5 wt.% sintering additives, and 0.5 wt.% each of dispersant, binder, and plasticizer, were used in preparingthe granules. Quantitative phase analysis and homogenous distribution of sintering additives in the granules were assessed byexamining the mixing index values through Rietveld analysis of X-ray diffraction data and energy dispersive X-rayspectroscopy studies.

Effects of Reactive Air Brazing Parameters on the Interfacial Microstructure and Shear Strength of GDC–LSM/Crofer 22 APU Joints

Kati Raju,Seyoung Kim,Young-Hoon Seong,Dang-Hyok Yoon 한국세라믹학회 2019 한국세라믹학회지 Vol.56 No.4

In this paper, the joining characteristics of GDC–LSM ceramics with Crofer 22 APU metal alloys was investigated at different brazing temperatures and holding times by reactive air brazing. Brazing was performed using Ag–10 wt% CuO filler, at three different temperatures (1000, 1050, and 1100°C for 30 minutes) as well as for three different holding times (10, 30, and 60 minutes at 1050°C). The interfacial microstructures were examined by scanning electron microscopy and the joining strengths were assessed by measuring shear strengths at room temperature. The results show that with increasing brazing temperature and holding time, joint microstructure changed obviously and shear strength was decreased. Shear strength varied from a maximum of 100±6 MPa to a minimum of 18±5 MPa, depending on the brazing conditions. These changes were attributed to an increase in the thickness of the oxide layer at the filler/metal alloy interface.

Vibration analysis of a Timoshenko beam carrying 3D tip mass by using differential transform method

Kati, Hilal Doganay,Gokdag, Hakan Techno-Press 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.65 No.4

Dynamic behaviour of beam carrying masses has attracted attention of many researchers and engineers. Many studies on the analytical solution of beam with concentric tip mass have been published. However, there are limited works on vibration analysis of beam with an eccentric three dimensional object. In this case, bending and torsional deformations of beam are coupled due to the boundary conditions. Analytical solution of equations of motion of the system is complicated and lengthy. Therefore, in this study, Differential Transform Method (DTM) is applied to solve the relevant equations. First, the Timoshenko beam with 3D tip attachment whose centre of gravity is not coincident with beam end point is considered. The beam is assumed to undergo bending in two orthogonal planes and torsional deformation about beam axis. Using Hamilton's principle the equations of motion of the system along with the possible boundary conditions are derived. Later DTM is applied to obtain natural frequencies and mode shapes of the system. According to the relevant literature DTM has not been applied to such a system so far. Moreover, the problem is modelled by Ansys, the well-known finite element method, and impact test is applied to extract experimental modal data. Comparing DTM results with finite element and experimental results it is concluded that the proposed approach produces accurate results.

A Highly Pathogenic Strain of Bacillus thuringiensis serovar kurstaki in Lepidopteran Pests

Kati, Hatice,Sezen, Kazim,Nalcacioglu, Remziye,Demirbag, Zihni The Microbiological Society of Korea 2007 The journal of microbiology Vol.45 No.6

In order to detect and identify the most toxic Bacillus thuringiensis strains against pests, we isolated a B. thuringiensis strain (Bn1) from Balaninus nucum (Coleoptera: Curculionidae), the most damaging hazelnut pest. Bn1 was characterized via morphological, biochemical, and molecular techniques. The isolate was serotyped, and the results showed that Bn1 was the B. thuringiensis serovar, kurstaki (H3abc). The scanning electron microscopy indicated that Bn1 has crystals with cubic and bipyramidal shapes. The Polymerase Chain Reactions (PCRs) revealed the presence of the cry1 and cry2 genes. The presence of Cry1 and Cry2 proteins in the Bn1 isolate was confirmed via SDS-PAGE, at approximately 130 kDa and 65 kDa, respectively. The bioassays conducted to determine the insecticidal activity of the Bn1 isolate were conducted with four distinct insects, using spore-crystal mixtures. We noted that Bn1 has higher toxicity as compared with the standard B. thuringiensis subsp. kurstaki (HD-1). The highest observed mortality was 90% against Malacosoma neustria and Lymantria dispar larvae. Our results show that the B. thuringiensis isolate (Bn1) may prove valuable as a significant microbial control agent against lepidopteran pests.

The Changing Anatomy of Regional Trade Agreements in East Asia

Kati Suominen 동아시아연구원 2009 Journal of East Asian Studies Vol.9 No.1

The recent proliferation of regional trade agreements in the East Asian region can be seen as the most notable development in the region's trading panorama in recent years. Yet, very little is as yet understood about the anatomy of these agreements and, consequently, their full implications to the regional economy. This article strives to fill this gap by analyzing the structure of four dozen RTAs by their various key component parts, including tariff liberalization schedules, rules of origin, and competition policy, customs, investment, and services provisions. The results reveal that intra-Asian RTAs are generally quite rapidly liberalizing, with the exception of agriculture, but they are also quite thin in trade-related disciplines when compared with the more legalistic US trans-Pacific RTAs and those of Mexico and Chile. The proposed Free Trade Area of the Asia-Pacific would inherently be a construct of the political economy interests of these various constituent RTAs.

Pregnancy After Breast Cancer – Prognostic Safety and Pregnancy Outcomes According to Oestrogen Receptor Status: A Systematic Review

Katie Nolan,Michael R. Boland,Arnold D.K. Hill 한국유방암학회 2022 Journal of breast cancer Vol.25 No.6

Purpose: Breast cancer is the primary cause of cancer-related death in women. Women diagnosed with estrogen receptor (ER)-positive breast cancer have prolonged treatment durations. Owing to the paucity of research and lack of consensus regarding conception planning and pregnancy for patients with ER-positive breast cancer, we aimed to assess pregnancy and survival outcomes in women with ER-positive breast cancer during and after treatment. Methods: We conducted a systematic review of the available studies on pregnancy after ERpositive breast cancer. The assessed outcomes included overall survival (OS), disease-free survival (DFS), hormonal therapy duration, and pregnancy outcomes. Results: Ultimately, 2,669 patients from five studies were included in this study. When all breast cancer receptor subtypes were included in the analysis, pregnancy after breast cancer was associated with a time-dependent protective effect on both DFS and OS. This protective effect was not evident when examining ER-positive patients with subsequent pregnancies, and no significant differences in DFS were observed. ER-positive patients who became pregnant received significantly lower rates of hormonal therapy. Hormonal treatment at the time of pregnancy was correlated with increased rates of termination owing to concerns about teratogenic effects. Conclusions: Pregnancy after breast cancer did not significantly affect DFS in ER-positive patients over a follow-up period of 5–10 years from diagnosis, although did significantly affect hormonal treatment duration in the reviewed studies. Further analysis and in-depth studies are required to assess the effects of altered hormonal treatment times, as well as patient management related to pregnancy planning after breast cancer.

Psychometric Properties of the Scoliosis Research Society Questionnaire (Version 22r) Domains Among Adults With Spinal Deformity: A Rasch Measurement Theory Analysis

Kati Kyrölä,Susanna Hiltunen,Mikko M. Uimonen,Jari Ylinen,Arja Häkkinen,Jussi P. Repo 대한척추신경외과학회 2022 Neurospine Vol.19 No.2

Objective: Adult spinal deformity (ASD) have lower health-related quality of life (HRQoL) compared to the general population. Applying Rasch measurement theory (RMT), this study tested the revised Scoliosis Research Society-22 (SRS-22r) HRQoL instrument among symptomatic adult patients with degenerative spinal disorders and varying degrees of ASD. Methods: SRS-22r data from 637 outpatient spine clinic patients with degenerative spine conditions were investigated for unidimensionality, item/scale fit, differential item functioning (DIF), scale coverage/targeting, and person separation index (PSI) using RMT. Results: Unidimensionality of the SRS-22r was not supported for either the total score or for 3 of its 5 domains. Item fit was acceptable for 11/22 items. The individual domains showed good coverage despite the degree of structural disorders. Ordered thresholds were achieved by merging response categories in some of the items. DIF towards age or sex was found in 11/22 items and in some domain items. The PSI exceeded 0.7 for the SRS-22r total score. Conclusion: The individual domain scores of the SRS-22r perform better than the total score providing good coverage and targeting among patients with ASD. Refinements of items and domains may improve the structural validity of the instrument to meet the criteria for measuring ASD patients, even when multidimensionality persists.