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김치환(Kim chihwan) 한국퍼실리티매니지먼트학회 2005 한국퍼실리티매니지먼트학회지 Vol.5 No.1
This study is focused on the strategies of facility management and the application of facility management system to position human and physical resources in university campus. The strategy of facility management In university campus accommodates university accreditation criteria of Korean Council for University Education. Mid- and Long-Term Development Plan etc. under the goals and principles of university management. The application of facility management system to position human and physical resources will be useful supporting system of decision making concerned with campus facilities under the situation of domestic university.
대학생들의 긴장성 두통 유무에 따른 스마트폰 중독, 전방 머리 자세, 삶의 질, 두통 영향 및 두통 장애 지수 비교
김치환 ( Kim Chihwan ),이동건 ( Lee Donggeon ) 대한통합의학회 2020 대한통합의학회지 Vol.8 No.4
Purpose : VDT (visual display terminal syndrome) can affect individuals who monitor or who work or play using video screens, including those of smartphones. In general, headache symptoms from overuse of these screens can appear due to eye fatigue, muscle pain in the joints of wrists or fingers, and muscle pain in the neck or shoulders. Many studies in the literature have supported standards that seek to prevent these symptoms. The incidence of musculoskeletal diseases caused by the use of smartphones is expected to increase rapidly, particularly among children and young adults, and these diseases are expected to develop into a societal problem. Therefore, in this study we investigate whether tension headaches that develop from smartphone usage can affect forward neck posture, neck pain, and quality of life. Methods : A total of 93 students from University participated in this study. We divided participants into two groups, those with tension headaches (n = 25) and those without (n = 68) and took forward neck measurements. Headaches were classified according to criteria from the International Headache Society and involved bilateral headache position, quality of pressing or tightening pain, mild or moderate pain intensity, and none due to daily physical activity. We surveyed participants using the smartphone addiction diagnosis questionnaire, the Neck Disability Index (NDI), the Headache Impact Test (HIT-6), and the Quality of Life Questionnaire. Results : Although we found no significant differences in tension headaches due to smartphone addiction diagnosis (p = 0.25), SF-36 life quality assessment (p = 0.06), and cranio-vertebral angle (p = 0.07), we found significant differences from the HIT-6 and the NDI (p <.05). Conclusion : Tension headaches are not correlated with smartphone addiction, quality of life, and forward neck angle but do have a correlation with the degree of cervical dysfunction and the effects of the headaches.
PECVD를 이용한 DLC 두께 제어에 따른 간섭색 구현
박새봄,김광배,김호준,김치환,최현우,송오성,Park, Saebom,Kim, Kwangbae,Kim, Hojun,Kim, Chihwan,Choi, Hyun Woo,Song, Ohsung 한국재료학회 2021 한국재료학회지 Vol.31 No.7
Various surface colors are predicted and implemented using the interference color generated by controlling the thickness of nano-level diamond like carbon (DLC) thin film. Samples having thicknesses of up to 385 nm and various interference colors are prepared using a single crystal silicon (100) substrate with changing processing times at low temperature by plasma-enhanced chemical vapor deposition. The thickness, surface roughness, color, phases, and anti-scratch performance under each condition are analyzed using a scanning electron microscope, colorimeter, micro-Raman device, and scratch tester. Coating with the same uniformity as the surface roughness of the substrate is possible over the entire experimental thickness range, and more than five different colors are implemented at this time. The color matched with the color predicted by the model, assuming only the reflection mode of the thin film. All the DLC thin films show constant D/G peak fraction without significant change, and have anti-scratch values of about 19 N. The results indicate the possibility that nano-level DLC thin films with various interference colors can be applied to exterior materials of actual mobile devices.