Cross-country Comparison of Effects of ‘Confidence in Science’ and ‘Instructional Clarity in Science Lessons’ on ‘Science Achievement’: Focusing on the Mediation Effect of ‘Interest in Learning Science’*

Baek,Sun-Geun,Cho,Sijung,Yang,Hye-Won,Kim,Seojin 서울대학교 교육종합연구원 2021 The SNU Journal of Education Research Vol.30 No.4

The effects of ‘confidence in science’ and ‘instructional clarity in science lessons’ on ‘science achievement’ mediated by ‘interest in learning science’ were investigated comparatively across South Korea, Japan, the USA, and England. From the data of TIMSS 2019, 3,861 cases from South Korea, 4,446 cases from Japan, 8,698 cases from the USA, and 3,365 cases from England were used to test a hypothesized structural equation model. As a result, the model fitted the data of each country satisfactorily, and measurement was found to be equivalent across the four countries. Moreover, the effect of confidence on achievement was statistically significant in all countries whereas the effect of instructional clarity on achievement and the effect of interest on achievement were only significant in South Korea and the USA. Furthermore, the mediation effect of interest was only significant in South Korea and the USA. Such results provide new perspectives in the role of confidence, instructional clarity, and interest on students’ science achievement and implications for customized educational programs and policies for each country.

사지마비환자에서 체중부하운동후 감소된 고칼슘뇨증

백선재,이난우,한통석,김혜순,김병학 최신의학사 1983 最新醫學 Vol.26 No.1

DAB를 통한 멀티미디어 전송 프레임 구조

나남웅,백선혜,홍성훈 전남대학교 전자통신기술연구소 2002 전자통신기술논문지 Vol.5 No.1

The Eureka-147 Digital Audio Broadcasting (DAB) system is well adapted to the requirements of mobile broadcasting services including high-quality audio, program associated data and other multimedia data. In this paper, we design the transport frame structures for the mobile multimedia services by using the configuration of the Eureka-147 DAB multiplex and MPEG system specifications, and then compare their performances in terms of functionality and overhead. Espeially, we suggest the effective transport structure, which is improved in the efficiency of media multiplexing architecture, by removing the functionally overlapped parts between DAB and MPEG systems. In addition, we evaluate the transmission environments of various DAB data channels and demonstrate the transmission error effects on the low bitrate video stream.

超音波 心音響圖에 의한 鬱血性 心不全症의 左心室機能의 硏究

이난우,백선재,한통석,김혜순,김병학 최신의학사 1983 最新醫學 Vol.26 No.1

8.3% Carbamide Peroxide 함유 펜 형 자가미백제인 BIancTis Forte의 색조개선 및 안전성에 관한 임상연구

이진경,민선홍,홍성태,오소람,정신혜,황영혜,유성엽,배광식,백승호,이우철,손원준,금기연 대한치과보존학회 2009 Restorative Dentistry & Endodontics Vol.34 No.2

This clinical study evaluated the whitening effect and safety of polymer based-pen type BlancTis Forte(NIBEC) containing 8.3% carbamide peroxide. Twenty volunteers used the BlancTis Forte whitening agent for 2 hours twice a day for 4 weeks As a control. Whitening Effect Pen (LG) containing 3% hydrogen peroxide was used by 20 volunteers using the same protocol. The change in shade (ΔE^(*) color difference) was measured using Shadepilot™ (DeguDent) before, during and after bleaching (2 weeks, 4 weeks and postbleaching 4 weeks). A clinical examination for any side effects (tooth hypersensitivity or soft tissue complications) was also performed at each check-up. The following results were obtained. 1 Both the experimental and control groups displayed a noticeable change in shade (ΔE) of over 2 No significant differences were found between the two group (p>0.05) implying that the two agents have a similar whitening effect. 2 The whitening effect was mainly due to changes in a and b values rather than in L value (brightness). The experimental group showed a significantly higher change in b value thus yellow shade than the control(p < 0.05) 3 None of the participants complained of tooth hypersensitivity or soft tissue complications confirming the safety of both whitening agents 8.3%의 carbamide peroxide를 함유한 펜형 코팅용 미백제인 BlancTis Forte (NIBEC, Seosul & JinCheon)를 실험군으로, 3% hydrogen peroxide를 함유한글 Whitening Effect Pen (LG. Seoul) 제재를 대조군으로 각각 피험자 20명에게 2시간씩 1일 2회 제조사의 지시대로 치아표면에 4주간 적용하도록 지시하고 색조개선 효능과 안전성을 평가하였다. 미백 효과는 미백 전 및 미백 2주, 4주 및 미백 종료 4주 후에 Shadopilot™을 이용하여 색 변화를 측정하였고, 매 내원시기마다 모든 환자는 치수생활력 검사와 치주 및 치태 검사를 통해 부작용 여부 (치아과민증 및 구감 내 연조직의 부작용)를 기록한 후 다음과 같은 결과를 얻었다. 1.실험군 및 대조군의 색 변화량 (ΔE)은 2이상으로 인지할 수 있는 색 변화를 보였으며, 두 제품 간에는 통계적으로 유의한 차이를 보이지 않아 (p > 0.05) 유사한 미백효능을 나타냄을 알 수 있었다. 2,미백효과는 명도의 개선보다는 주로 a. b값의 변화에 의한 것으로 특히 실험군에서 b값의 변화, 즉 황색조의 개선효과가 대조군에 비해 유의성 있게 높은 것으로 나타났다 (p <0.05). 3.치아나 치은의 과민증이나 이상증상을 호소하는 피험자는 없어 두 제품 모두 안전성을 확인할 수 있었다.

Three-dimensional finite element analysis of the deformation of the human mandible

Sun-Hye Baek,Hyun-Suk Cha,Jung-Yul Cha,Yoon-Shik Moon,Sang-Jin Sung 대한치과교정학회 2012 대한치과교정학회지 Vol.42 No.4

Objective: The aims of this study were to investigate mandibular deformation under clenching and to estimate its effect on the stability f orthodontic mini-implants (OMI). Methods: Three finite element models were constructed using computed tomography (CT) images of 3 adults with different mandibular plane angles (A, low; B, average; and C, high). An OMI was placed between #45 and #46 in each model. Mandibular deformation under premolar and molar clenching was simulated. Comparisons were made between peri-orthodontic mini-implant compressive strain (POMI-CSTN) under clenching and orthodontic traction forces (150 g and 200 g). Results: Three models with different mandibular plane angles demonstrated different functional deformation characteristics. The compressive strains around the OMI were distributed mesiodistally rather than occlusogingivally. In model A, the maximum POMI-CSTN under clenching was observed at the mesial aspect of #46 (1,401.75 microstrain [μE]), and similar maximum POMI-CSTN was observed under a traction force of 150 g (1,415 μE). Conclusions: The maximum POMI-CSTN developed by clenching failed to exceed the normally allowed compressive cortical bone strains; however, additional orthodontic traction force to the OMI may increase POMI-CSTN to compromise OMI stability.

Three-dimensional finite element analysis of the deformation of the human mandible: a preliminary study from the perspective of orthodontic mini-implant stability

Baek, Sun-Hye,Cha, Hyun-Suk,Cha, Jung-Yul,Moon, Yoon-Shik,Sung, Sang-Jin The Korean Association Of Orthodontists 2012 대한치과교정학회지 Vol.42 No.4

Objective: The aims of this study were to investigate mandibular deformation under clenching and to estimate its effect on the stability of orthodontic mini-implants (OMI). Methods: Three finite element models were constructed using computed tomography (CT) images of 3 adults with different mandibular plane angles (A, low; B, average; and C, high). An OMI was placed between #45 and #46 in each model. Mandibular deformation under premolar and molar clenching was simulated. Comparisons were made between peri-orthodontic mini-implant compressive strain (POMI-CSTN) under clenching and orthodontic traction forces (150 g and 200 g). Results: Three models with different mandibular plane angles demonstrated different functional deformation characteristics. The compressive strains around the OMI were distributed mesiodistally rather than occlusogingivally. In model A, the maximum POMI-CSTN under clenching was observed at the mesial aspect of #46 (1,401.75 microstrain [${\mu}E$]), and similar maximum POMI-CSTN was observed under a traction force of 150 g (1,415 ${\mu}E$). Conclusions: The maximum POMI-CSTN developed by clenching failed to exceed the normally allowed compressive cortical bone strains; however, additional orthodontic traction force to the OMI may increase POMI-CSTN to compromise OMI stability.

Effects of Water-soluble and Water-insoluble Fractions of Kimchi on the Alteration of Plasma Lipids and Fibrinolytic Activity in Middle-aged Healthy Subjects

Sun-Hye Choi,Myung-Ja Kwon,Mi-Jeong Kim,Sun-Jin Kwon,Yeong-Ho Baek,Yeong-Ok Song 한국식품영양과학회 2006 Preventive Nutrition and Food Science Vol.11 No.3

Freeze-dried kimchi fractions, water-soluble (WSK) versus water-insoluble (WISK), on their effects on plasma lipids and for their fibrinolytic activities were studied. Nineteen middle-aged healthy subjects were assigned to WSK, WISK, or placebo during 6 weeks of kimchi supplementation. Subjects in the WSK and WISK groups were supplemented with 3 grams of kimchi pills (equivalent to 60 grams of fresh kimchi), while the placebo group was on their normal diets. LDL/HDL and atherogenic index decreased in the subjects who received kimchi pills, but not in those in the placebo group. The levels of plasma triglyceride were significantly decreased in the WSK group compared with those in the WISK group (p<0.05). However, there was no difference in the levels of total cholesterol and HDL between the two groups. Fibrinolytic activity of WISK was significantly higher than that of WSK.

Acupuncture for Adult Obstructive Sleep Apnea or Obstructive Sleep Apnea-Hypopnea Syndrome: A Review of the China National Knowledge Infrastructure Database

Baek Hye Kyung,김영준,Lee Yeon Sun,Jo Hye Ri,Park Mi So,Shin Dong Guk,Shim Hyun A 대한침구의학회 2022 대한침구의학회지 Vol.39 No.4

The purpose of this study was to analyze acupuncture treatment methods and acupoints used to treat obstructive sleep apnea (OSA) or obstructive sleep apnea-hypoapnea syndrome (OSAHS). The data were retrieved from January 2010 to May 2022 from the China National Knowledge Infrastructure database. The search terms included “adult,” “obstructive sleep apnea,” “obstructive sleep apnea hypoapnea syndrome,” “acupuncture,” and “electro-acupuncture.” Clinical trials for acupuncture treatment of OSA or OSAHS were included in this review (4 non-randomized controlled studies, 1 was a case report, and 10 randomized controlled studies). For OSA and OSAHS treatment, the acupoints that were most frequently used included REN23, LU7, ST40, EX9, LI11, and DU20. Compared with the control or Western treatment group, the treatment outcome measures of participants in the acupuncture treatment group significantly improved. In some studies, participants in the acupuncture group did not have side effects and the treatment was cost-effective. The data analyzed in this review suggest that acupuncture is an effective treatment for OSA or OSAHS.

The Effects of English Proficiency and Text Difficulty on Collaborative Dialogue During Dictogloss

Sun-Hye Baek,Jin-Hwa Lee 한국응용언어학회 2012 응용 언어학 Vol.28 No.1

It is well known that L2 learners’ interaction during focus-on-form tasks is influenced by many factors such as proficiency, familiarity, gender, task type and so on. Of these potential factors, this study investigated how learners’ English proficiency and text difficulty affect collaborative dialogue during a dictogloss task. Twenty-four first grade middle school students were divided into six groups of four members in terms of their English proficiency: two high homogeneous groups, two intermediate homogeneous groups, and two high-intermediate mixed groups. The groups were engaged in two dictogloss tasks targeting present and past tense, once with a relatively easy text and once with a more difficult text. Their performances were recorded and analyzed in terms of the amount, type (word, sentence, or discourse level), and outcome (correct, incorrect, or unresolved) of focus-on-form episodes (FFEs). The results revealed that all groups tended to focus on forms including target forms. The mixed and intermediate groups showed the most frequent FFEs and the better resolution of them in dictogloss with an easy text. When the text became difficult, however, the number of FFEs sharply decreased for these groups, indicating that the lower level learners were more sensitive to text difficulty in dictogloss. Also collaborative orientation seemed to be more important than proficiency difference in interaction. These findings suggest that if the teacher selects a proper level of text and promotes a collaborative orientation among learners, middle school students can contribute to and benefit from a dictogloss task regardless of their English proficiency.