• 한국재료학회지
• /
• 제15권4호
• /
• pp.281-284
• /
• 2005

Room and high temperature deformation behaviors of Cu-Zr-Ti-Pd bulk metallic glasses produced by copper mold casting were investigated. The addition of Pd was shown to enhance the glass forming ability and thermal stability of Cu-Zr-Ti base bulk metallic glass. The compressive strength of $Cu_{55}Zr_{30}Ti_{10}Pd_5$ bulk metallic glass was 2230 MPa with 1.8 plastic strain. The stress overshoot and yield drop phenomenon were observed below $487^{\circ}C$ and a drastic decrease in the flow stress was observed at $487^{\circ}C$. The stress overshoot is thought to be associated with stress-induced structural relaxation.

• The Korean Journal of Physiology and Pharmacology
• /
• 제21권5호
• /
• pp.487-493
• /
• 2017

The anterior cingulate cortex (ACC) is known for its role in perception of nociceptive signals and the associated emotional responses. Recent optogenetic studies, involving modulation of neuronal activity in the ACC, show that the ACC can modulate mechanical hyperalgesia. In the present study, we used optogenetic techniques to selectively modulate excitatory pyramidal neurons and inhibitory interneurons in the ACC in a model of chronic inflammatory pain to assess their motivational effect in the conditioned place preference (CPP) test. Selective inhibition of pyramidal neurons induced preference during the CPP test, while activation of parvalbumin (PV)-specific neurons did not. Moreover, chemogenetic inhibition of the excitatory pyramidal neurons alleviated mechanical hyperalgesia, consistent with our previous result. Our results provide evidence for the analgesic effect of inhibition of ACC excitatory pyramidal neurons and a prospective treatment for chronic pain.

• 응용통계연구
• /
• 제29권3호
• /
• pp.487-503
• /
• 2016

귀농인구의 증가는 빠르게 고령화되고 있는 한국농촌에서 경제 활성화의 단초로 주목받고 있다. 본 논문에서는 2013년 귀농귀촌인 통계를 바탕으로 네트워크 방법을 사용해 귀농인구의 이동에 대한 분석을 진행한다. 구체적으로 다양한 네트워크 중심도지표를 사용해 주요 귀농 거점지역을 파악하고 통계적 네트워크 모형을 사용해 귀농인구의 이동에 존재하는 경향을 살펴본다. 또한 latant distance model을 이용하여 거리가 귀농인구 이동에 미치는 영향에 대해 알아본다.

• 정보처리학회논문지A
• /
• 제10A권5호
• /
• pp.487-492
• /
• 2003

멀티미디어 콘텐츠 스트림 서비스를 이용하는 사용자들의 서비스 품질에 대한 요구를 만족시키기 위해 사용자 실적 또는 등급에 따라 자원을 배분하고 서비스 요청과 서비스 품질을 제어하기 위한 방안이 필요하다. 본 논문에서는 스트림 서버 자원을 효율적으로 분배하명서 사용자들에게 제공되는 서비스 품질을 제어하는 방안으로서 사용자 등급별 QoS 보장을 위한 서비스 요청 필터링 알고리즘(URFA : User Request Filtering Algorithm)을 제안한다. URFA는 사용자들의 요금 실적과 서비스 이용 실적 등을 고려하여 사용자 등급(우수 등급, 기본등급)을 나누고 등급별 스트림 서버의 승인비율을 제어함으로써 서버자원의 이용효율을 높이고 사용자 등급에 따라 품질 수준을 제어할 수 있도록 하였다.

• Asian-Australasian Journal of Animal Sciences
• /
• 제13권4호
• /
• pp.487-489
• /
• 2000

An experiment was conducted for 56 days using nine castrated male Black Bengal goats (initial live weight 9.0 kg) aged about 5 months to study the effects of feeding Sesbania leaves as a sole feed on growth performance and nutrient utilization. The animals were fed ad libitum on either road-side grass, Sesbania aculeata leaves or Sesbania rostrata leaves. Average dry matter (DM) intake was 179, 229 and 259 g/d for goats fed road-side grass, Sesbania aculeata and Sesbania rostrata, respectively. Corresponding mean values for average daily live weight change were -6.6, 9.5 and 38.1 g, respectively. These values were higher (p<0.05) for goats fed Sesbania leaves than those given road-side grass. The apparent digestibility of all the proximate components except CF and the concentrations of DCP, TDN, DOM and ME of Sesbania leaves were higher (p<0.05) than those of road-side grass. Sesbania rostrata was superior (p<0.05) to Sesbania aculeata for nutrient digestibilities (except for NFE) and also for DOM, DCP and ME concentrations. Therefore, it may be concluded that the production of Sesbania rostrata, a legume fodder, should be encouraged for feeding goats.

• 한국의류학회지
• /
• 제41권3호
• /
• pp.487-500
• /
• 2017

This study examines the attributes of cosmetic stores that Chinese tourists considered when purchasing cosmetics in Korea and the effect of the evaluation of attributes in regards to satisfaction and brand loyalty based upon brand experience. The survey was performed from January 1-14 in 2014 through a Chinese professional online survey channel-www.sojump.com. A total of 338 data from female and male respondents who visited Korea and purchased Korea brand's cosmetics were analyzed by SPSS and AMOS. The results were as follows. Frist, cosmetic store attributes were composed of three factors such as physical environment and salespersons, price and promotion, service. Second, all the factors had a positive influence on brand experience. Among them, the influence of physical environment and salespersons were the highest. Third, brand experience influenced satisfaction and satisfaction also had positive influence on brand loyalty. The results above indicate that providing various experiences that appeal to customers is as important as improving product quality when maintaining long-term customer relationships and loyalty.

• 한국수자원학회논문집
• /
• 제37권6호
• /
• pp.487-497
• /
• 2004

하천을 구성하는 수공시스템의 구성요소 중에서 댐과 같이 하천유량 조절에 중요한 역할을 하는 시설이 신규건설을 통해 시스템에 추가되면, 기존 시스템의 운영방식은 이를 고려하여 변화되어야 된다. 기존댐에서 사용되던 운영률은 기왕의 시스템의 입력과 출력에 적합하도록 설계되었으므로, 신규댐이 하천에 추가되면 운영률 또한 이를 고려하여 변화되어야 한다. 본 연구에서는 하천에 신규댐 건설로 인하여 기존댐 운영률의 변화가 필요할 때, 기존댐과 신규댐의 운영목적을 동시에 고려하여 새로운 운영률을 작성하기 위한 기법을 제시하였다. 이를 위하여 추계학적 기법을 통해 발생된 유입량과 최적기법을 사용한 댐 연계운영을 실시하여 저수지 운영률을 개발하였다 본 연구에서 제안된 기법의 검증을 위해 금강유역을 선정해 적용한 결과 새로운 운영률의 적합성을 확인하였다.

• Journal of the Optical Society of Korea
• /
• 제19권5호
• /
• pp.487-493
• /
• 2015

A wavefront coding (WFC) technique provides an extension of the depth of field for a microscopy imaging system with slight loss of image spatial resolution. Through the analysis of the relationship between the incidence angle of light at the phase mask and the system pupil function, a mixing symmetrical cubic phase mask (CPM) applied to 5X-40X micro-objectives is optimized simultaneously based on point-spread function (PSF) invariance and nonzero mean values of the modulation transfer function (MTF) near the spatial cut-off frequency. Optimization results of the CPM show that the depth of field of these micro-objectives is extended 3-10 times respectively while keeping their resolution. Further imaging simulations also prove its ability in enhancing the defocus imaging.

• 콘크리트학회논문집
• /
• 제20권4호
• /
• pp.487-493
• /
• 2008

산간지형이 많은 국내여건상 물류수송 및 교통 등을 위한 터널구조물의 활용성이 매우 높다. 그러나 터널굴착 및 라이닝 콘크리트구조물의 병행 시공시 굴착에 의한 진동 등의 영향으로 콘크리트구조물 초기 재령에 균열 및 내구성 저하의 문제가 발생할 수 있다. 본 연구에서는 터널 라이닝용 콘크리트 배합 선정에 있어서 3성분계 시멘트 및 최근 국내에서 개발된 나일론 보강섬유의 내구성 및 역학적 물성 증진 효과를 실험적으로 검토하였다. 실험 결과, 나일론 섬유 및 3성분계 시멘트를 혼입시 콘크리트의 전반적인 물성 및 내구성능이 증진됨을 확인할 수 있었다.

• 한국측량학회지
• /
• 제38권5호
• /
• pp.487-496
• /
• 2020

This study introduces how GISs (Geographic Information Systems) are used to assess spatial disparities in urban green spaces in the Chicago. Green spaces provide us with a variety of benefits, namely environmental, economic, and physical benefits. This study seeks to explore socioeconomic relationships between green spaces and their surrounding communities and to evaluate spatial disparities from a variety of perspectives, such as health-related, socioeconomic, and physical environment factors. To achieve this goal, this study used spatial statistics, such as optimized hotspot analysis, network analysis, and space-time cluster analysis, which enable conclusions to be drawn from the geographic data. In particular, 12 variables within the three factors are used to assess spatial disparities in the benefits of the use of green spaces. Finally, the variables are standardized to rank the community areas and identify where the most vulnerable community areas or parks are. To evaluate the benefits given to the community areas, this study used the z- and composite scores, which are compared in the three different combinations. After identifying the most vulnerable community area, crime data is used to spatially understand when and where crimes occur near the parks selected. This work contributes to the work of urban planners who need to spatially evaluate community areas in considering the benefits of the uses of green spaces.