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- 저자 : 정진화(Jung, Jin-Hwa) (검색결과 95 건)
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스컬용융법에 의한 패각을 이용한 큐빅지르코니아 단결정 성장
정진화,연석주,석정원,Jung, Jin-Hwa,Yon, Seog-Joo,Seok, Jeong-Won 한국결정성장학회 2013 韓國結晶成長學會誌 Vol.23 No.3
In this research, cubic zirconia is synthesized with a refined CaO from shells as a stabilizer through Skull melting method. The proper process time and concentration are defined by Hydration reaction to produce the refined CaO after two different treatments using 0.1 mol% of HCl respectively with Cockle shell. The highest purity of CaO is reached when the shell is immersed in 1 mol% HCl. In Hydration reaction step, the pure $Ca(OH)_2$ is produced at $45^{\circ}C$ for 24 hours. The highest purity of CaO is measured when the $Ca(OH)_2$ is treated by heat at $1200^{\circ}C$ for 5 hours. The single crystals are grown through Skull melting method by adding the different contents of the refined CaO from 10 mol% to 30 mol% into $ZrO_2$. The frequency of High-frequency oscillator used for Skull melting method is 3.4 MHz. The descending speed of the single crystal is 3 mm/hour. The grown length of the single crystal is 4 cm. As a result of this study, 15 mol% of CaO has the best crystallinity. 본 연구에서는 안정화제로, 패각으로부터 정제한 CaO를 사용하여 Skull melting법으로 큐빅 지르코니아를 성장시켰다. 꼬막 패각을 HCl을 0.1~1 mol%로 1차 처리한 후 수화반응을 거쳐 최적의 처리시간과 농도를 검토하였다. HCl을 1 mol%의 농도로 처리했을 때 가장 순도가 높았으며 수화반응시 $45^{\circ}C$의 온도로 24시간 동안 반응시킬 때 완전한 $Ca(OH)_2$ 를 얻을 수 있었다. $Ca(OH)_2$를 $1200^{\circ}C$에서 5시간 처리하였을 때 CaO의 순도가 가장 높게 측정되었다. 패각으로부터 얻어진 CaO를 $ZrO_2$에 첨가하여 함량을 10~30 mol% 로 변화시켜 Skull melting법으로 단결정을 성장시켰다. Skull melting법에 사용된 고주파 발진기의 주파수는 약 3.4 MHz이며 단결정의 하강속도는 시간당 3 mm로 4 cm 길이로 성장시켰다. 실험결과 CaO의 함량이 15 mol% 일 때 결정성이 가장 우수했다.
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치료적 승마가 뇌성마비의 체간 고유수용성, 안정성 및 자세에 미치는 영향
정진화,유재호,Jung, Jin-Hwa,Yu, Jae-Ho 대한물리치료학회 2010 대한물리치료학회지 Vol.22 No.5
Purpose: In this study, children with cerebral palsy were treated for 8 weeks using horse riding trunk proprioception, stability and posture to investigate the effect of hippotherapy in the field of physical therapy. Methods: A total of 18 subjects were divided into an experimental group treated by horseback riding and a control group. Both groups were evaluated pre- and post-treatment. Trunk proprioception was measured three times in the sitting position with their eyes and ears closed to reach the target position the angle error of the mean was calculated. Trunk stability was measured using a forceplate and the data were used to calculate the postural sway path & postural sway velocity. Posture was evaluated using the Posture Assessment Scale (PAS). Results: After hippotherapy, the experimental group showed a significant improvement in trunk proprioception, stability and posture (p<0.05), but the control group improved in posture only (p<0.05). Trunk proprioception, stability and posture was significantly different between the two groups (p<0.05). Conclusion: Eight weeks of hippotherapy is effective in improving trunk proprioception, stability, and posture. Research using this therapy should be studied further as a possible new therapeutic approach in the field of physical therapy.
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소족지 중족골통을 동반한 무지 외반증에서의 변형 스카프 절골술
정진화,정현우,주인탁,Chung, Jin-Wha,Jung, Hyun-Woo,Chu, In-Tak 대한족부족관절학회 2008 대한족부족관절학회지 Vol.12 No.2
Purpose: The purpose of this study was to evaluate the radiological and clinical results of modified scarf osteotomy for hallux valgus with lesser metatarsalgia. Materials and Methods: Total 19 patients (24 feet) were reviewed by medical records and radiographs. All patients were female and the mean age at the time of operation was 46.4 years. The mean follow-up time was 14.8 months. We modified original scarf osteotomy by adding the procedure of closing wedge osteotomy at the medial side of distal fragment for achieving of the supination of the first metatarsal head. Additionally, Akin osteotomy of the first proximal phalanx was done in 16 patients (20 feet) and no lesser metatarsal operation was done. First-second intermetatarsal, hallux valgus and distal metatarsal articular angles were analyzed radiologically before and after the operation. And 3-dimensional CT was used to evaluate the supination of the first metatarsal head. Clinical results were assessed by American Orthopaedic Foot and Ankle Society (AOFAS) score and persistence of lesser metatarsalgia. Results: First-second intermetatarsal and hallux valgus angles were reduced from the mean pre-operative values of $14.2^{\circ}$ and $32.5^{\circ}$ to $8^{\circ}$ and $12.5^{\circ}$, respectively, 12 months after the operation. And the supination of the first metatarsal head was confirmed by 3-dimensional CT. The mean AOFAS score improved from 41.4 points pre-operatively to 87.2 points at follow-up. Lesser metatarsalgia still remained in 2 patients (2 feet). Conclusion: Modified scarf osteotomy would be an effective surgical procedure, especially, for achieving downward displacement and supination of the first metatarsal head in hallux valgus with lesser metatarsalgia.
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정진화 ( Jung Jin-hwa ),지성애 ( Chi Sung-ae ) 한국유아교육학회 2017 유아교육연구 Vol.37 No.6
본 연구는 노래를 활용한 유아 극놀이프로그램을 개발하고, 개발한 프로그램이 유아의 공감능력, 언어능력, 작업기억능력 그리고 음악능력에 미치는 영향을 분석하여 유아교육현장 적용 타당성을 검증하는데 목적이 있다. 노래를 활용한 유아 극놀이프로그램의 체계는 목적 및 목표, 교육내용, 교수-학습 방법 및 평가로 구성하였다. 노래를 활용한 유아 극놀이프로그램의 효과 비교를 위해 실험집단과 비교집단 유아를 각 18명씩 선정하였으며, 연구대상의 월령은 73.81개월이었다. 실험집단 유아들은 노래를 활용한 유아 극놀이프로그램에 참여하였고, 비교집단 유아들은 그림책 이야기 내용 토의를 통한 유아 극놀이프로그램에 참여하였으며, 실험처치는 5주간 총 20차시 실시되었다. 유아의 공감능력, 언어능력, 작업기억능력, 음악능력 검사를 통해 수집된 연구자료는 t-test로 실험처치의 효과를 분석하였다. 프로그램의 효과 분석 결과 실험집단의 유아들이 비교집단 유아들보다 공감능력, 언어능력, 음악능력이 효과적으로 증진된 것으로 나타났다. 작업기억능력은 실험집단과 비교집단 간에 유의미한 차이가 나타나지는 않았으나, 두 집단 모두 사후 검사의 평균점수가 높아진 것으로 나타났다. The purpose of this study was to develop a dramatic play program using songs and to evaluate the effectiveness of the program on young children's empathy, language skills, working memory, and musical ability. The program consisted of purposes and goals, contents, teaching - learning methods, and evaluation. Thirty-six young children(18 children in experimental group & 18 children in comparison group; mean age 73.81 months) participated in the study. The dramatic play program using songs was implemented with children in the experimental group while children in comparison group participated in 'the dramatic play program through discussion of picture books'. This experiment was conducted through 20 activities over five weeks. We used t-test to compare scores on ‘Test of Ability of Empathy’, ‘K-WISC IV: Language comprehension', 'K-WISC IV: Working memory', 'Kid's Mat(Kid's Music Aptitude Test)’ between two groups. The findings showed that the scores of the experimental group's empathy, language skills, and musical ability in an experimental group were significantly higher than the scores of the comparison group. After participating in the program, both groups showed an increase in working memory. However, the scores on working memory were not significantly different between the two groups. The research revealed that the dramatic play program using songs for young children is positive effects to promote children's empathy, language skills, and music ability.
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정진화(Jin Hwa Jung),조갑희(Kab Hee Cho) 한국사회체육학회 2000 한국사회체육학회지 Vol.13 No.-
The purpose of this study is the difference of expertness can have on the prediction of tennis-playing action, and analyzed the effect that the difference of short-term memory will have upon the prediction of tennis-playing action. All subjects who participated in this study were collected at the middle-high school tennis player in Korea. Total number of 80, subjects took each own tennis skill form in slide films, Tachistoscope model 41010-A(made in Lafayette Instrument Corn), was used in order to measured the prediction ability. Watching the slide screen of tennis-playing motions, provided in experimental topics, I have scored the prediction of frequency and the prediction ability were measured. By analysing the data measured in this study, I have the following conclusions. First, the difference of expertness influence the prediction ability of tennis-playing action. Second, the difference of expertness was shown differently in the visual cues of tennis-playing action.
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학교스포츠클럽 참여자의 성취목표성향이 스포츠 자신감 및 운동 정서에 미치는 영향
정진화(Jung, Jin-Hwa),이윤수(Lee, Yun-Soo) 한국체육과학회 2019 한국체육과학회지 Vol.28 No.4
This study is primarily aimed at analyzing the effect of the achievement goal orientation of students in middle and high school participating in sports club on sports confidence and exercise emotion. To achieve this goal, students from middle and high schools in Seoul were selected as a population in 2018. The convenience sampling method was used to select 314 participants. The questionnaires were used to collect data. A multi-regression analysis was conducted using the 23.0 version for the statistics program SPSS/PC Window. Based on the above research methods and procedures, results are the followings. First, it was found that the achievement goal orientation of middle and high school sports club participants has a partial impact on sports confidence. Second, it was found that the achievement goal orientation of middle and high school sports club participants has a partial impact on exercise emotion. Third, it was found that sports confidence of middle and high school sports clubs participants has a partial impact on exercise emotion. Through this study, we can confirm that the achievement goal orientation of middle and high school sports club participants affects sports confidence and exercise emotion. Therefore, physical education teachers and educators should constantly explore the new tasks and teaching strategies that can enhance the achievement goal of middle and high school students, and use this research as a basis for planning and operation of school sports clubs in the future.
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