• Educational Technology International
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• 제22권2호
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• pp.255-283
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• 2021

In the early 2020, COVID-19 changed the traditional way of teaching and learning. This paper aimed to explore the impact of college students' perception of course quality on their online learning satisfaction. A total of 4,812 valid samples were extracted, and the difference analysis and hierarchical regression analysis were used to make an empirical analysis of college students' online learning satisfaction. The research results were as follows. Firstly, there was no difference in online learning satisfaction among students by gender and grade. Secondly, learning assessment, course materials, course activities and learner interaction, and course production had a significant positive impact on online learning satisfaction. Course overview and course objectives had an insignificant correlation with online learning satisfaction. Thirdly, the total effect of online learning satisfaction was as follows. Course production had the greatest effect, followed by course activities and student-student interactions, followed by course materials. It was the learning evaluation that showed the least effect. This study can provide empirical reference for college teachers on how to continuously improve online teaching and increase students' satisfaction with online learning.

• Annals of Clinical Neurophysiology
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• 제6권1호
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• pp.26-30
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• 2004

Background: Electrophysiologic study accurately predicts the degree of degenerated motor axons but cannot give precise information on the type of injury that occurred in Bell's palsy. Because of these limitation for prognostic prediction in Bell's palsy, we evaluated divergence of electrophysiological time course for the purpose of presuming the type of injury in Bell's palsy. Methods: We did bilateral facial nerve conduction studies in 103 Bell's palsy patients, who visited to Han-Gang sacred heart hospital from 1998 to 2001. We compared the CMAP amplitude of disease site with that of normal site and suggested that decremental CMAP amplitude ratio (percentage) as a degree of denervation of affected facial nerve. Then we demonstrated the time course of denervation percentage. After defining normal range of CMAP amplitude difference from normal control group, we also evaluated if distinct time course of early minimal denervation is present. Results: Our results show that time course of the denervation in early stage of Bell's palsy reflect various injury type such as axonotmesis, neurotmesis or other unidentified type. We cannot identify the distinct time course of early minimal denervation. Conclusions: The time course as well as the maximal value of denervation are the best prognostic guidelines in Bell' s palsy. So repeated serial electrophysiologic test are inevitable to assess prognosis. As an another topic, early minimal denervation for prognostic prediction deserve to be evaluated as a future work up for prognostic prediction.

• 한국항해항만학회지
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• 제34권6호
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• pp.453-458
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• 2010

이 연구에서는 장기간의 기상 자료를 이용하여 지구 온난화와 태풍의 변화 경향과의 관계를 분석하였다. 연구 결과에 의하면, 태풍의 연 평균 발생 수는 감소하고, 태풍 역내의 최대풍속은 서서히 강해지는 추세를 보인다. 이는 대부분의 수치 시뮬레이션 결과와 일치한다. 그리고 태풍의 정상진로는 증가하는 추세를 보이는 반면 서진형진로는 감소하는 경향을 나타낸다. 최근 10년간의 태풍의 이동경로는 정상진로 6 : 서진형진로 3 : 이상진로 1의 비율을 보인다. 우리나라에 영향을 미치는 태풍은 남해안을 통과하는 것이 가장 많다. 최근에는 서해안을 통과하는 태풍의 수가 감소하고 동해안을 통과하는 태풍의 수는 증가하는 추세를 보인다. 지구 온난화와 관련하여 특히 주목할 점은 태풍의 세기가 점점 강해지고 있다는 사실이다. 기상재해의 예방 관점에서 이에 대한 주의와 대책이 요구된다.

• 대한의생명과학회지
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• 제11권2호
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• pp.221-225
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• 2005

To investigate the spectroscopic findings of embolized lesions induced with a fat-emulsion technique with magnetic resonance images (MRI). A fat emulsion was made with 0.1 ml of triolein and 20 ml of normal saline. In 12 cats, the internal carotid artery was infused with the fat emulsion. Contrast-enhanced T1-weighted MRI and multivoxel spectroscopy were obtained at 1 hour, 1 and 4 days, and 1 week after embolization. NAA (N-acetylaspartate), Cr (creatine) and Cho (choline) were evaluated on the spectroscopy. Statitistical analysis wsperformed at the embolized and contralateral normal hemisphere in the integral and amplitude of NAA, Cr and Nho in time course. Also NAA/Cr and Cho/Cr were compared in both hemisphere and in time course. The emboli zed lesions showed contrast enhance ments on Gd-enhanced Tl-weighted i~ages at 1 hour. This contrast enhancement was decreased at day 1, and id not appear agter day 4. In spectroscopy, the embolized hemisphere showed no statistical difference to the normal contralateral side at 1 hour and in time course. NAA/Cr and Cho/Cr were not significantly different in both hemispheres at 1 hour and in time course. Cerebral-fat embolism induced by a triolein emulsion in cats revealed no statistical difference on MR spectroscopy. Triolein-emulsion can be used in the study of blood-brain barrier.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제10권1호
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• pp.79-87
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• 2006

In this paper we investigated the influence on school students when they use graphing calculator for exploration, including their experience of exploration, their ability and attitudes. After using graphing calculator based mathematics exploration course, two students were interviewed and 162 students who finished the course in these years were investigated. The results show that graphing calculator is a useful tool to develop students' explorative ability. Most of students had positive attitudes to and were interested in making use of graphing calculator.

• 한국해양공학회지
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• 제27권2호
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• pp.87-92
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• 2013

The variation in the course keeping ability in relation to rudder type is investigated using simulations with 3 different types of rudders (a normal rudder, normal rudder with a plate, and Schilling rudder) under wave conditions. The simulation is developed based on an MMG model with Kijima's regression model, along with the data from Son's experiments and Kose's experiments. A 3-D source distribution method is applied to calculate the source of the external wave forces for the simulation. The coefficients of an autopilot controller that may affect the course keeping ability are also estimated from the simulations with the different rudders. The course keeping ability is evaluated by comparing the forward distances while the ships are simulated with the rudders and autopilot controller.

• 대한본초학회지
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• 제24권4호
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• pp.25-30
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• 2009

Objectives : In order to evaluate the effect of Samguiyong-tang (SGYT) on diabetes, we prepared two types of Samguiyong-tang (Type-I and -II) which was composed of three kinds of oriental drug such as Ginseng, Angelica gigantis radix and Deer antler. Type I was traditional hot-water extract prepared from three kinds of drug, and Type II was the mixture of ethanol-extract of ginseng and hot-water extract prepared from the other two drugs. Methods : We tested the effects of SGYT on the blood glucose levels in normal rats by the method of glucose tolerance test. And also examined the effects of SGYT on the levels in normal rats or diabetic rats induced by Streptozotocin during 20 days. Results : 1. In the course of oral glucose tolerance test, the blood glucose level decreased by administration of SGYT I or II in normal rats. 2. In the course administration of SGYT during 20 days in normal rats, the blood glucose levels decreased until day 4 by Type I or Type II, but thereafter the level was recovered to the normal. 3. In the course administration of SGYT during 20 days in the diabetic rats induced by streptozotocin, Type I (SGYT) had some effect on the blood glucose levels only at 12 day, and Type II (SGYT) decreased the levels from 6th day and so on, significantly. Conclusions : The results suggested that SGYT II had some decreasing effects on the blood glucose levels in diabetic rats induced by Streptozotocin.

• 한국의류학회지
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• 제47권2호
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• pp.353-370
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• 2023

In this study, the performance of ultrasonic cleaners for ultrasonic washing, which is one of the wet cleaning methods, was evaluated. The washing performances of ultrasonic cleaners were compared with commercial washing machines under normal and wool courses based on different parameters such as detergency, wrinkle formation, fabric damage, dimensional stability, and germ removal ability. Cotton, silk and wool were used in this experiment. Results revealed that the ultrasonic washing detergency of cotton fabrics was lower than that of commercial washing machines under the normal course and similar to that of commercial washing machines under the wool course. Detergency of silk fabrics was similar under both normal and wool courses. In terms of wrinkle formation and dimensional stability, ultrasonic cleaners showed lesser wrinkles and lower shrinkage than commercial washing machines. Considering damage evaluation, ultrasonic cleaners more effectively removed soil without damaging fabrics compared with commercial washing machines. The bacteria removal rate of both cotton and silk was more effective than the wool course of a commercial washing machine. Thus, this study compares the performance of ultrasonic cleaners and commercial washing machines and provides meaningful results related to ultrasonic washing performance.

• 대한치과의사협회지
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• 제54권9호
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• pp.712-728
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• 2016

These days, the clinical course of dental imaging sector has done a lot of implant-related imaging courses, including cone beam CT. In contrast, the general image reading course is not given a lot of opportunities to learn. Therefore, it is imperative that we talk about the general image interpretation that can be read easily applied in a dental clinic. When we see a strange radiographic finding of our patient in the dental clinic, we should first check whether the radiographic finding is a normal finding or a morbidity. If the finding is diagnosed as a morbidity, you should make plans for the appropriate therapy. The most important step is classification between normal state and morbidity. Some lesions may occur without any clinical symptoms. Therefore, we should read all the parts of radiographs, even the patient does not have clinical symptoms.

• 한국IT서비스학회지
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• 제21권3호
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• pp.73-87
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• 2022

As the COVID-19 pandemic continues to prolong, non face-to-face, online classes has become the new normal in education. To examine the effect of course types and course delivery modes on student course satisfaction, the study analyzed survey data collected from 2,743 students enrolled in a 4-year university located in a metropolitan area. Basic Frequency analysis as well as keyword network analysis were used to analyze student survey data. The main results and implications of the study are as follows. First, the survey results indicated that students preferred asynchronous classes over synchronous online classes. This tendency was consistent regardless of student grades and majors as well as the course type. However, students majoring in more practice-oriented disciplines tend to prefer synchronous online classes and blended classes, and this tendency gets stronger with courses in major. Second, the keyword network analysis results further indicated that interactivity may play an important role in both synchronous and asynchronous online course satisfaction.