• 대한치과교정학회지
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• 제21권1호
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• pp.197-221
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• 1991

The purpose of the present study was to investigate the differences of EMG activity of the masticatory muscles between normal occlusion and Class III malocclusion during various jaw functions. 46 subjects of 18.4-25.7 years were employed in this study: 26 subjects were normal occlusions, and 20 subjects were Class III malocclusions. The EMG data from the anterior and posterior temporal, anterior and posterior masseter muscles in both sides as mandibular elevators and supra-hyoid muscle group (close to the anterior belly of digastric muscle in right side) as mandibular depressor were recorded with the Medelec MS 25 electromyographic machine. The EMG recordings were analyzed during mandibular rest position, maximal biting, mastication with chewing gum, and swallowing of peanuts. All data were recorded and statistically processed. 1. The maximal mean amplitude of the anterior temporal muscle was stronger significantly in Class III malocclusion than in normal occlusion, and then the posterior temporal was weaker during mandibular rest position. 2. The maximal mean amplitudes in the anterior and posterior temporal muscles and the anterior masseter muscle of Class III malocclusion was weaker significantly than that of normal occlusion during maximal biting. 3. During mastication of the chewing gum, the maximal mean amplitudes of Class III malocclusion was weaker significantly than normal occlusion in the anterior and posterior temporal muscles of the working side, and the duration of Class III malocclusion was longer in the anterior temporal muscles of both aides, and the posterior temporal and the anterior masseter muscle of the balancing side. There were significant increasings of the latency in balancing anterior temporal, working posterior temporal muscles and supra-hyoid muscle group of Class III malocclusion. The silent period durations was 16.36 ms in Class III malocclusion while 10.76 ms in normal occlusion, which was statistically different (P < 0.05). 4. At swallowing of peanuts, the maximal mean amplitude of Class malocclusion was weaker significantly in the posterior temporal muscle than that of normal occlusion. There was no significant difference of duration between normal occlusion and Class III malocclusion. 5 The muscle activities of Class III malocclusion had a tendency of decrease less than normal occlusion. And then the muscle activities of the anterior temporal and anterior masseter muscles in Class III malocclusion showed the tendency of the increase more than other muscles of Class III malocclusion.

• Journal of Preventive Medicine and Public Health
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• 제40권1호
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• pp.36-44
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• 2007

Objectives : There have been few studies examining the differences in health care utilization across social classes during the last year of life. Therefore, in this study we analyzed the quantitative and qualitative differences in health care utilization among cancer patients across educational classes in their last year of life, and derived from it implications for policy. Methods : To evaluate health care utilization by cancer patients in the last year of life, Death certificate data from 2004 were merged with National Health Insurance data (n=60,088). In order to use educational level as a social class index, we selected the individuals aged 40 and over as study subjects (n=57,484). We analyzed the differences in the medical expenditures, admission days, and rates of admission experience across educational classes descriptively. Multiple regression analysis was conducted to evaluate the association between medical expenditures and independent variables such as sex, age, education class, site of death and type of cancer. Results : The upper educational class spent much more on medical expenditures in the last one year of life, particularly during the last month of life, than the lower educational class did. The ratio of monthly medical expenditures per capita between the college class and no education class was 2.5 in the last 6-12 months of life, but the ratio was 1.6 in the last 1 month. Also, the lower the educational class, the higher the proportion of medical expenditures during the last one month of life, compared to total medical expenditures in the last one year of life. The college educational class had a much higher rate of admission experiences in tertiary hospitals within Seoul than the other education classes did. Conclusions : This study shows that the lower educational classes had qualitative and quantitative disadvantages in utilizing health care services for cancer in the last year of life.

• Journal of Forest and Environmental Science
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• 제33권3호
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• pp.233-238
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• 2017

This study was carried out to figure out the number of logs for sawtimber by DBH and height class and to compare merchantable volume ratio by categorizing into sawtimber, lagging board and pulpwood, and others for Pinus densiflora, Pinus koraiensis, and Larix kaempferi. Logs for sawtimber were hardly produced in small DBH class of three species, but produced evidently from medium DBH class. In large DBH class, the number of logs for sawtimber were noticeably different among species: 4.3 logs for L. kaempferi, 2.6 logs for P. densiflora, and 1.0 logs for P. koraiensis on average. Similarly, merchantable volume ratio for sawtimber were largely different among species in large DBH class with higher than 15 m: 82% logs for L. kaempferi, 60% logs for P. densiflora, and 44% logs for P. koraiensis. When compared to the upper diameter and upper height by species with regard to the last log of a tree produced for sawtimber, upper diameter was smallest with 14.1 cm and upper height was highest with 12.2 m in L. kaempferi. Overall, L. kaempferi was considered as the more commercial species for sawtimber production than P. densiflora and P. koraiensis.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권1호
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• pp.368-391
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• 2018

Face recognition (FR) with a single sample per person (SSPP) is common in real-world face recognition applications. In this scenario, it is hard to predict intra-class variations of query samples by gallery samples due to the lack of sufficient training samples. Inspired by the fact that similar faces have similar intra-class variations, we propose a virtual sample generating algorithm called k nearest neighbors based virtual sample generating (kNNVSG) to enrich intra-class variation information for training samples. Furthermore, in order to use the intra-class variation information of the virtual samples generated by kNNVSG algorithm, we propose image set based multimanifold discriminant learning (ISMMDL) algorithm. For ISMMDL algorithm, it learns a projection matrix for each manifold modeled by the local patches of the images of each class, which aims to minimize the margins of intra-manifold and maximize the margins of inter-manifold simultaneously in low-dimensional feature space. Finally, by comprehensively using kNNVSG and ISMMDL algorithms, we propose k nearest neighbor virtual image set based multimanifold discriminant learning (kNNMMDL) approach for single sample face recognition (SSFR) tasks. Experimental results on AR, Multi-PIE and LFW face datasets demonstrate that our approach has promising abilities for SSFR with expression, illumination and disguise variations.

• 공학교육연구
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• 제24권2호
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• pp.41-50
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• 2021

This study was conducted with the aim of exploring ways to more effectively manage related courses by checking the educational effects of the operation of engineering liberal arts courses operated for the development of communication skills of engineering students by detailed factors of communication skills. To achieve the purpose of the study, literature review and survey methodologies were used. A survey was conducted before and after class targeting four class students of the engineering college of D University in Gyeonggi-do. As a result of comparing the results of the pre-test before class through this class and the results of the post-test conducted at the end of the class, it was confirmed that speaking ability, reading ability, and communication ability were improved at a statistically significant level. In addition, as a result of analyzing differences in communication competencies for each individual variable, it was found that there were statistically significant differences according to gender, students' major field, and grade. Based on such research results, several educational proposals were presented to increase the effectiveness of the management of courses operated to develop communication skills.

• International Journal of Internet, Broadcasting and Communication
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• 제15권1호
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• pp.195-202
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• 2023

This study is a comparative survey study conducted to explore the differences in learners' learning flow and learning satisfaction according to the non-face-to-face class operation methods implemented at universities. After implementing different class management methods for the same subject taught by the same instructor non-face-to-face for 15 weeks, each learning flow and learning satisfaction were compared and analyzed, and the collected data were analyzed with IBM SPSS 21.0. As a result of the study, learning flow was high in the order of lectures using real-time ZOOM and recorded lectures using self-studio(3.41±0.91, 3.28±1.01), and learning satisfaction was high in the order of lectures using real-time ZOOM and lectures using the automatic recording system of classes(3.40±0.80, 3.30±0.74). The item with the lowest score was the PPT audio recording lecture in both areas of learning flow and learning satisfaction(2.72±1.04, 1.73±1.04). Considering that system errors such as sound in the smart lecture environment operated for the first time in this study affected the research results, it is suggested that future research should be conducted by supplementing the corresponding part.

• 대한치과교정학회지
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• 제50권5호
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• pp.304-313
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• 2020

Objective: The aim of this study was to evaluate the stability of bimaxillary surgery involving bilateral intraoral vertical ramus osteotomy performed with or without presurgical miniscrew-assisted rapid palatal expansion (MARPE) in adult patients with skeletal Class III malocclusion. Methods: A total of 40 adult patients with skeletal Class III malocclusion were retrospectively divided into two groups (n = 20 each) according to the use of MARPE for the correction of transverse maxillomandibular discrepancy during presurgical orthodontic treatment. Serial lateral cephalograms and dental casts were analyzed until 6 months after surgery. Results: Before presurgical orthodontic treatment, there was no significant differences in terms of sex and age between groups. However, the difference of approximately 3.1 mm in the maxillomandibular intermolar width was statistically significant (p < 0.001). Two days after surgery, the mandible had moved backward and upward without any significant intergroup difference. Six months after surgery, the maxillary intercanine (2.7 ± 2.1 mm), interpremolar (3.6 ± 2.4 mm), and intermolar (2.0 ± 1.3 mm) arch widths were significantly increased (p < 0.001) relative to the values before presurgical orthodontic treatment in the MARPE group; these widths were maintained or decreased in the control group. However, there was no significant difference in surgical changes and the postsurgical stability between the two groups. No significant correlations existed between the amount of maxillary expansion and postsurgical mandibular movement. Conclusions: MARPE is useful for stable and nonsurgical expansion of the maxilla in adult patients with skeletal Class III malocclusion who are scheduled for bimaxillary surgery.

• 한국콘텐츠학회논문지
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• 제16권1호
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• pp.167-178
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• 2016

이 연구의 목적은 연기전공대학생들의 수업을 통해 참여동기, 연기표현성, 심리적 행복감간의 어떠한 인과관계가 있는가를 연구하는 데에 목적이 있다. 연구목적을 위해 단순무선표집 방법을 사용하였으며 서울, 경기도에 소재한 대학에 재학 중인 연극, 연기전공 대학생들을 모집단으로 설정하고, 총 499부의 설문지가 분석에 사용되었다. 설문 문항은 사전검사를 통해 신뢰도와 타당도가 검증된 73개의 문항을 사용하였다. 자료처리방법은 IBM STATISTICS SPSS 22와 AMOS 22 통계패키지를 이용하였으며, 기술통계분석, 확인적요인분석, 신뢰도분석, 구조방정식 모형을 적용하여 분석하였다. 본 연구의 결론은 다음과 같다. 연기전공대학생의 수업 참여동기 중 내적동기와 외적동기는 연기표현성과 심리적 행복감의 모든 하위요인에 정적으로 유의한 영향을 미치며 무동기는 영향을 미치지 않았다. 연기표현성 중 개성과 표현충동은 심리적 행복감에 모두 영향을 미쳤으며 동작성은 영향을 미치지 않았다.

• 대한물리치료과학회지
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• 제30권4호
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• pp.63-70
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• 2023

Background: The purpose of this study was to comparison of learning attitude, class satisfaction, and self-regulated learning ability of face-to-face and non-face-to-face classes in college physical therapy students to improve the educational effect and quality of non-face-to-face classes when face-to-face classes such as COVID-19 become inevitable in the future. Design: Cross-section study. Methods: This study was conducted with 91 college students, 3rd year students of physical therapy department at a community college in 'A' region, Gyeongsangbuk-do, who took face-to-face classes in the first semester of 2022 and non-face-to-face classes in 2021 of the previous semester. Results: Class attitude was higher in face-to-face classes than in non-face-to-face classes. There was a significant difference in class satisfaction between face-to-face and non-face-to-face classes, In self-regulated learning ability, face-to-face classes had a more positive effect on self-regulated learning ability than non-face-to-face classes. Conclusion: This study serves as empirical basic data on the actual condition of non-face-to-face classes compared to face-to-face classes for college physical therapy students, suggests the direction of future research, and improves the quality of non-face-to-face classes in the field of physical therapy, which requires a lot of practice. and hope it will be used for development.

• 대한소아치과학회지
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• 제31권1호
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• pp.108-113
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• 2004

정상교합자와 골격성 III급 부정교합자간의 성장 정도에 차이가 있는지를 평가하기 위해 8-12세 여자를 대상으로 하여 진단 석고 모형과 측모두부방사선사진을 기준으로 정상교합자 172명, 골격성 III급 부정교합자 191명 총 363명을 분류하여 연구를 시행하였다. 경추의 하연의 만곡도와 수직 수평 길이의 비를 측정해서 연령이 증가함에 따른 변화를 분석하여 다음과 같은 결론을 얻었다. 1. 연령이 증가함에 따라 제$2{\sim}6$경추의 하연의 만곡도는 정상교합자와 골격성 III급 부정교합자 모두에서 일정하게 증가하였다. 2. 연령이 증가함에 따라 제$3{\sim}6$ 경추의 수직 수평 길이의 비도 정상교합자와 골격성 III급 부정교합자 모두에서 일정하게 증가하였다. 3. 제$2{\sim}6$경추의 하연의 만곡도와 제$3{\sim}6$경추의 수직 수평 길이의 비에서 정상교합자와 골격성 III급 부정교합자간의 경추골성숙도 차이를 조사한 결과 통계적으로 유의한 차이를 보이지 않았다. 이상의 결과에서 정상교합자와 골격성 IIII급 부정교합자간의 경추골성숙도를 비교했을 때 유의한 차이를 보이지 않았으므로 성장에 차이가 없음을 시사하였다.