코로나19 유행에 대한 염려가 방역수칙 실천 및 일상생활 변화에 미치는 영향

방지예,이혜원,강윤정,김경찬 한국생활환경학회 2023 한국생활환경학회지 Vol.30 No.2

The infection of COVID-19 gradually has increased in recent years and high degree of social distancing in response to the COVID-19 pandemic has been implementing. This study sought to identify demographic characteristics associated with concerns about COVID-19 and changes related to concerns. We selected data from the Community Health Survey Data on 2020. We conducted a frequency analysis to analyze demographic characteristics associated with concerns about COVID-19. In addition, we performed a survey logistic regression analysis to identify precautionary behaviors and daily life changes related to concerns about COVID-19. The concerns about COVID-19 are higher among women, the elderly, the Married, those who low education level, poor subjective health status(p<.001). It was found that concerns about infection, death, criticism and economic damage have a significant influence on quarantine rules(precautionary behavior, social distancing, refrain from going out, washing hands and use of hand sanitizer) and daily life changes(physical activity, instant food intake, delivery food intake, drinking and smoking). This study suggests that concerns about COVID-19 are associated with precautionary behaviors and daily life changes. It is necessary to efficiently manage concerns about infectious disease in the future by considering the social environment factors identified in our study.

IN792 초내열 합금의 고온 산화 거동에 미치는 결정립 크기의 영향

방지예,이동현,이수열 대한금속·재료학회 2024 대한금속·재료학회지 Vol.62 No.4

It is known that Ni-based superalloys possess superior mechanical properties in high-temperatureand high-pressure environments. One of the drawbacks of these alloys is their tendency to oxidize at hightemperatures. Improving their oxidation properties and obtaining a fundamental understanding of theunderlying mechanism of their oxidation behavior are critical for high temperature applications. In this work,we manufactured IN792 Ni-based alloys with two different grain sizes to examine the effect of grain size onoxidation behavior at 850oC and 980oC. The oxidation rate became faster as the grain size became finer, andat 850oC, the oxide layer was composed of external oxides (TiO2/NiO, Ni-Co-Cr-O, Cr2O3), internal oxides(TiTaO4, non-oxidized layer, Al2O3) and a precipitate-free zone (PFZ). At 980oC, this structure became unstabledue to the diffusion of Ni, and in particular, a lot of exfoliation of external oxides occurred in the coarse grain. Regardless of the structure of the oxide layers, the thickness of the PFZ increased significantly in the finegrains with a low  fraction. Compared to the hardness of external Cr-rich oxides of ~500 HV, the hardnessesof the internal oxides consisting of Al-rich and Ni-Al-O were approximately 1000 HV and 1500 HV,respectively. Therefore, the most vulnerable position is expected to be the interfacial boundary between theexternal oxide and internal oxide, and this resulted in the ease of exfoliation of the external oxide in thislocation, by exposing the Ni-Al-O oxide to the surface in the coarse grain at 980oC. The current work can bea useful method in the design of Ni-based superalloys by controlling the grain size of the components.

고령자의 에어로빅스 참여가 신체조성 및 체력과 주관적 건강상태에 미치는 영향

방지예(JiYeBang),김선응(SeonEungKim) 한국체육학회 2012 한국체육학회지 Vol.51 No.5

이 연구는 65세 이상 여성 고령자 110명(참여집단 65명, 비 참여집단 45명)을 대상으로 8주 동안 주3회, HRmax 30~50% 강도의 에어로빅스 프로그램을 실시하여, 참여집단과 비 참여집단의 주관적 건강도와 신체조성 및 체력 검사에 대한 사전 및 사후검사를 실시한 후 고령자의 체력과 주관적 건강상태의 변화에 미치는 효과를 분석한 결과를 요약하면 다음과 같다. 참여유무에 따른 신체조성은 참여집단이 체중, 체지방률과 체지방량에서 유의하게 감소하였고, 체력은 참여집단이 근력, 민첩성에서 증가하였다. 시기의 주 효과는 참여집단이 근력, 협응성, 평형성, 유연성에서 사후가 사전보다 증가했다. 참여유무에 따른 주관적 건강상태는 참여집단이 건강 및, 체력 인식도에서 높고, 시기의 주 효과는 참여집단이 일상생활과 체력 인식도에서 사후가 유의하게 높게 나타났다. 상호작용 효과는 참여집단이 일상생활과 체력 인식도에서 사후에서 높게 나타났다. 건강과 삶의 질 인식도는 참여집단의 사후가 사전보다 낮게, 비 참여집단에서는 높게 나타났다. The object of this study is that regularly participating senior aerobic for the senior women who are more than 65 years old is how to affect them for developing body composition and physical fitness, and the change of subjective health condition. In case of the body composition and physical fitness development according to the participation whether or not in aerobic, the group which participated in it and took post-test increased significantly in comparison with pre-test. And for the groups, a participating group in the program increased another group which does not participate in it. In case of the change of subjective health condition, there are the same results as they are mentioned above for a period and the groups. A group participating in it, they increased significantly perception level of health and physical fitness. In case of the interaction effects between period(pre and post) and group, all the items are different statistically.

금속 자기기억법 활용 보일러 튜브의 미소 결함 검출력 연구

서정석,명주홍,방지예,정계조,Jungseok, Seo,Joohong, Myong,Jiye, Bang,Gyejo, Jung 한국전력공사 2022 KEPCO Journal on electric power and energy Vol.8 No.2

The boiler tubes of thermal power plants are exposed to harsh environment of high temperature and high pressure, and the deterioration state of materials rapidly increases. In particular, parent material and welds of the materials used are subjected to a temperature change and various constraints, resulting in deformation and its growth, resulting in frequent leakage accidents caused by tube failure. The power plant checks the integrity of boiler tubes through non-destructive testing as it may act as huge costs loss and limitation of power supply during power station shutdown period due to boiler tube leakage. However, the current non-destructive testing is extremely limited in the field to detect micro cracks. In this study, the ability of metal magnetic memory technique to detect flaws of size that are difficult to inspect by the visual or general non-destructive methods was verified in the early stage of their occurrence.

안드로이드 스마트폰 간의 자료 공유 시스템 설계 및 구현

김유리(Yuri Kim),방지예(Jiye Bang),이종우(Jongwoo Lee) 한국멀티미디어학회 2010 한국멀티미디어학회 학술발표논문집 Vol.2010 No.2

최근 국내에 스마트폰 사용이 보편화됨에 따라 스마트폰을 더 효율적으로 사용하기 위해 다양한 응용들이 출시되고 있다. 본 논문에서는 안드로이드를 기반으로 하여 각 개인이 모바일 상에서 자료를 공유할 수 있도록 해주는 응용을 구현하였다. SIP Client를 기반, 안드로이드 폰 간에 이미지 및 동영상 송수신이 가능하도록 구현하였다. 아울러 전화 기능 및 일대일 채팅도 가능하도록 구현하였다.

고정 방식 차이에 따른 배전 가공전선의 고주기피로 수명 특성 비교 평가

이두영,정진성,김영대,방지예,Lee, Dooyoung,Jung, Jinseung,Kim, Youngdae,Bang, Jiye 한국전력공사 2021 KEPCO Journal on electric power and energy Vol.7 No.2

High cycle fatigue life for the cables with two different types of clamps is estimated comparatively through acceleration testing. The high cycle fatigue fracture of overhead lines is caused mainly by the aeolian vibration which is induced by vortex shedding. It is necessary to manage the integrity of cables continuedly considering that the aeolian vibration is unavoidable since it occurs in steady and relatively low wind velocity. Two types of clamps which are largely used for overhead lines of the distribution grids are selected and failure data are obtained by step stress testing with a electrodynamic shaker with them. The inverse power law is assumed to describe the stress-life relationship and the fatigue limit at any specified life is supposed to follow Weibull distribution. The life of the cable is defined as the number of cycles to the time that one of strands is completely broken. Finally, the fatigue limits of the cables with two clamp types are estimated at the reference life of 500 Mcycles and compared each other based on a bending vibration amplitude.