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세리아 안정화 지르코니아의 제조 및 특성(I) : CeO<sub>2</sub>첨가량 변화에 따른 Ce-TZP의 기계적 특성
정승화,강종봉,Jung, Seung-Hwa,Kang, Jong-Bong 한국재료학회 2010 한국재료학회지 Vol.20 No.7
The usual ceramic process of mixing and milling in state of oxides $ZrO_2$ and $CeO_2$ was adopted in this study in a wet process to manufacture Ce-TZP. $CeO_2$-$ZrO_2$ ceramics containing 8~20 mol% $CeO_2$ were made by heat treatment at $1250\sim1500^{\circ}C$ for 5hr. The maximum dispersion point of every slurry manufactured with a mixture of $ZrO_2$ and $CeO_2$ was neat at pH10. A stable slurry with average particle size of 90 nm can be manufactured when it is dispersed with the use of ammonia water and polycarboxylic acid ammonium. The sintered Ce-TZP ceramics manufactured with the addition of $CeO_2$ in a concentration of less than 10 mol% progressed to the fracture of the specimen due to the existence of a monoclinic phase of more than 30% at room temperature. More than 99% of the tetragonal phase was created for the sintered body with the addition of $CeO_2$ beyond 18 mol%, but the degradation of the mechanical properties on the entire specimen was brought about due to the $CeO_2$ existing in a percentage above 3%. Consequently, the optimal Ce-TZP level combined in the oxide state was identified to be 16 mol% of $CeO_2$ contents.
요통환자에 대한 새로운 표면 근전도 방법의 신뢰도와 타당도
정승화(Jung, Seung-Hwa),박대성(Park, Dae-Sung) 한국HCI학회 2020 한국HCI학회 학술대회 Vol.2020 No.2
요통환자의 공포-회피 반응검사(Fear Avoidance Belief Questionnaire; FABQ)와 요통 기능 장애 수준 검사(Oswestry Disability Index; ODI)를 통한 평가는 신체 기능장애 정도와 예후를 판단하는데 중요한 요인이다. 표면 근전도는 근 긴장도를 평가할 수 있는 도구로 카이로프랙터나 물리치료사가 환자의 진단 도구로 사용하고 있다. 이에 본 연구에서는 새로운 조이스틱형 표면 근전도 방법을 통한 심리사회적 수준 평가의 유용성을 검정하기 위해 장비의 검사-재검사 신뢰도와 타당도를 확인하고자 하였다. 본 연구를 통해 새로운 표면 근전도 방법은 요통환자의 요부 근활성도를 측정하는데 높은 신뢰수준을 확인할 수 있었으며 평가 변수들과의 유의한 상관관계를 보여 요통 환자가 겪는 심리사회적 문제를 평가하는데 타당도 높은 평가도구라 할 수 있겠다.
온라인 패션 쇼핑몰의 모기업 특성이 e-브랜드 개성에 미치는 영향
정승화(Seung Hwa Jung),이유리(Yu Ri Lee) 한국복식학회 2011 服飾 Vol.61 No.5
Consumers attribute human personality to products or stores as well as brands. As brand personality is imprinted to a consumer`s mind, in e-commerce, the concept of store personality needs to be examined by comprehending the e-brand personality. Unlike the recent studies that focus primarily on the portal site, we attempt to identify e-brand personality of online shopping malls that sell fashion products. This study also examined the impact of the parent company`s attributes on e-brand personality. A survey was conducted to 240 females and 240 males in their 20s or 30s. E-brand personality of three different types of the Internet shopping mall was evaluated by 160 respondents, respectively. As a result, we found that Internet shoppers perceive that e-brands have four distinct personality dimensions: young, reliable, sophisticated, and creative. Among the four dimensions, young and reliable showed the most significant influence on intention to visit the shopping mall site. Besides, e-brand personality varied with parent companies` attributes such as reputation, credibility, and fashion industry-relatedness. Especially, credibility of the parent company showed a strong positive relationship with e-brand personality.
뒤넙다리근 능동과 수동신장 운동이 요통 환자의 골반 가동성에 미치는 영향
정승화 ( Seung-hwa Jung ),박대성 ( Dae-sung Park ) 대한물리의학회 2021 대한물리의학회지 Vol.16 No.1
PURPOSE: Hamstring muscle shortening is related to low back pain, and it is important to check the hamstring muscle flexibility and pelvic mobility to analyze the effects of the intervention. This study examined the effects of hamstring muscle shortening on flexibility and pelvic mobility according to the method of stretching the hamstring muscle in patients with low back pain. METHODS: Forty Low Back Pain Patients participated. The subjects performed the Visual Analogue Scale (VAS), Fear Avoidance Belief Questionnaire (FABQ), Korean version of Oswestry Disability Index (KODI), Myovision, and sensbalance therapy cushion (pelvic mobility, proprioception). The subjects were divided into two groups to perform the passive and active stretching protocol. The intervention was conducted three times a week for four weeks. RESULTS: Hamstring muscle flexibility was increased significantly in both groups (p < .05), and there was no difference between the groups. VAS, FABQ was decreased significantly in both groups (p < .01), and there was no difference between the groups. The left lower back muscle impedance was decreased significantly in both groups (p < .05). The passive stretching group showed a significant increase in the pelvic anterior, posterior, and left tilt ROM (p < .05). The active stretching group showed a significant increase in the pelvic anterior, posterior tilt ROM (p < .05). CONCLUSION: Both stretching methods may be useful intervention methods for pelvic mobility and pain recovery and can assess back pain recovery.