• 대한수학회지
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• 제34권3호
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• pp.731-770
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• 1997

We study Diriclet forms and related subjects for the Gibbs measures of classical unbounded sping systems interacting via potentials which are superstable and regular. For any Gibbs measure $\mu$, we construct a Dirichlet form and the associated diffusion process on $L^2(\Omega, d\mu), where \Omega = (R^d)^Z^\nu$. Under appropriate conditions on the potential we show that the Dirichlet operator associated to a Gibbs measure $\mu$ is essentially self-adjoint on the space of smooth bounded cylinder functions. Under the condition of uniform log-concavity, the Gibbs measure exists uniquely and there exists a mass gap in the lower end of the spectrum of the Dirichlet operator. We also show that under the condition of uniform log-concavity, the unique Gibbs measure satisfies the log-Sobolev inequality. We utilize the general scheme of the previous works on the theory in infinite dimensional spaces developed by e.g., Albeverio, Antonjuk, Hoegh-Krohn, Kondratiev, Rockner, and Kusuoka, etc, and also use the equilibrium condition and the regularity of Gibbs measures extensively.

• Journal of Information Technology Applications and Management
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• 제20권4호
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• pp.47-66
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• 2013

Recently, with the diffusion of a new paradigm named as the creative economy, the government's interests and efforts regarding support of SMEs' R&D have been concentrated. In particular, due to the dominant perception that the fundamental science and original technology from government-funded research institutes can further enhance the capabilities of SMEs' R&D, the importance of performance's diffusion on national R&D is further emphasized. In fact, the domestic SMEs don't have enough budget and workforce, so that all of self-contained technologies, product's competitiveness as well as the R&D capabilities, are very vulnerable, and thereby SMEs' commercialization is very likely to fail. For this end, SMEs need to adopt the concept of open innovation as the use of external R&D resources by licensing. In this study, we conducted a survey on a total of 286 domestic IT SMEs, and analyzed empirically to compare the degree of their acceptance on technological innovation between two groups divided by open/not-open innovation. As a result, we drew some of the key factors influencing the acceptance of the SMEs' open technological innovation, and found a variety of implications through them.

• Child Health Nursing Research
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• 제17권1호
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• pp.1-9
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• 2011

Purpose: The purpose of this study was to investigate the knowledge and practice level of infection managements in child guardians with respiratory infections after H1N1 diffusion of 2009. Methods: The data were collected during February and March 2010 using a self-report questionnaire. The participants were 228 child guardians. Data were analyzed using frequency, percentage, means, SD, t-test, F-test, Pearson correlation coefficients, and Cronbach's alpha with the SPSS 17.0 program. Results: Mean age of the guardians and children were 37.8 years, 4.1 years respectively. For knowledge level of respiratory infections, hand washing method had the highest score and snuffles prevention method, the lowest. For practice level for respiratory infections, environmental hygiene management had the highest score and symptom management, the lowest. Infection management knowledge and practice level had a positively significant correlation in every area. Conclusion: The results indicate the necessity of continual education on infection management, and that the most efficient timing for the education appears be for participants during their first pregnancy or after the woman has delivered her child.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2009년도 추계학술대회
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• pp.1018-1021
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• 2009

무선 센서 네트워크는 특정지역에서 데이터를 수집하여 처리는 작은 센서 노드들로 구성된다. 이러한 센서들은 최초로 설치된 이후에는 배터리로 동작되며, 동작기간이 수개월에서 수년까지 지속되어야 함으로 제한된 자원을 효율적으로 활용할 수 있어야 한다. 본 논문에서는 데이터 중심개념을 적용한 Directed Diffusion의 기본동작구조에 RHC(rounting history cache)를 적용하여, 데이터 전송경로 설정에 신뢰성과 효율성을 높인다. 제안하는 RHC 알고리즘은 각 센서노드가 자신의 RHC를 주기적으로 업데이트하여 최적화경로를 저장하고 있기 때문에, 이벤트 발생시마다 경로를 재설정하여 에너지가 낭비되는 것을 최소화 하였고, 중복메시지의 최소화로 신뢰성을 향상시켰다.

• Nuclear Engineering and Technology
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• 제54권8호
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• pp.2801-2808
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• 2022

The synergistic effect of ZrC nanoparticle pining and Re solution in W matrix on the thermal stability of tungsten was studied by investigating the evolution of the microstructure, hardness and tensile properties after annealing in a temperature range of 1000-1700 ℃. The results of metallography, electron backscatter diffraction pattern and Vickers micro-hardness indicate that the rolled W-1wt%Re-0.5 wt% ZrC alloy has a higher recrystallization temperature (1600 ℃-1700 ℃) than that of the rolled pure W (1200 ℃), W-0.5 wt%ZrC (1300 ℃), W-0.5 wt%HfC (1400-1500 ℃) and W-K-3wt%Re alloy fabricated by the same technology. The molecular dynamics simulation results indicated that solution Re atoms in W matrix can slow down the self-diffusion of W atoms and form dragging effect to delay the growth of W grain, moreover, the diffusion coefficient decrease with increasing Re content. In addition, the ZrC nanoparticles can pin the grain boundaries and dislocations effectively, preventing the recrystallization. Therefore, synergistic effect of solid solution Re element and dispersed ZrC nanoparticles significantly increase recrystallization temperature.

• 한국건설순환자원학회논문집
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• 제2권1호
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• pp.34-39
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• 2014

이 연구의 목적은 하이볼륨 플라이애시(HVFA) 콘크리트의 강도수준 및 플라이애시의 혼입률별로 콘크리트 내의 철근부식 및 염소이온 침투 저항성을 평가하는 것이다. 이를 위하여 물-결합재비 및 플라이애시 혼입률에 따라 철근 상부를 노출시킨 원주형 공시체와 통상적인 원주형 공시체를 제작하였으며, 이들 각각에 대해 압축강도 및 염소이온 침투 저항성 시험과 전기화학적 방법에 의한 철근부식 촉진시험을 수행하였다. 실험 결과, 대체적으로 플라이애시 혼입률이 많을수록 HVFA 콘크리트의 압축강도는 감소하였으나, 철근부식 및 염소이온 침투 저항성은 크게 개선되는 것으로 나타났다.

• 한국멀티미디어학회논문지
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• 제24권5호
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• pp.684-694
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• 2021

Resting-state Functional Magnetic Resonance Imaging(fMRI) data detects the temporal correlations in Blood Oxygen Level Dependent(BOLD) signal and these temporal correlations are regarded to reflect intrinsic cortical connectivity, which is deactivated during attention demanding, non-self referential tasks, called Default Mode Network(DMN). The relationship between fMRI and anatomical connectivity has not been studied in detail, however, the preceded studies have tried to clarify this relationship using Diffusion Tensor Imaging(DTI) and fMRI. These studies use method that fMRI data assists DTI data or vice versa and it is used as guider to perform DTI tractography on the brain image. In this study, we hypothesized that functional connectivity in resting state would reflect anatomical connectivity of DMN and the combined images include information of fMRI and DTI showed visible connection between brain regions related in DMN. In the previous study, functional connectivity was determined by subjective region of interest method. However, in this study, functional connectivity was determined by objective and advanced method through Independent Component Analysis. There was a stronger connection between Posterior Congulate Cortex(PCC) and PHG(Parahippocampa Gyrus) than Anterior Cingulate Cortex(ACC) and PCC. This technique might be used in several clinical field and will be the basis for future studies related to aging and the brain diseases, which are needed to be translated not only functional connectivity, but structural connectivity.

• 한국인터넷방송통신학회논문지
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• 제23권6호
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• pp.47-53
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• 2023

본 논문은 밀리미터파(W대역)의 이중편파 신호를 모노펄스 신호로 변환하는 도파관 타입의 급전 구조를 설계하고 제작 방안을 제시하였다. W대역과 같은 높은 주파수 대역에서는 도파관의 크기가 매우 작기 때문에 복잡한 구조의 제작이 매우 어렵다. 따라서 높은 주파수 대역의 도파관 타입 급전 구조는 제작성이 중요하기 때문에 전주도금(Electro Forming) 방식과 확산접합 방식을 본 연구에서 제안하고 검증하였다. 설계된 모노펄스 급전 구조는 90도 하이브리드에 90도 위상 천이기를 결합한 180도 하이브리드 8개와 이중편파 분리를 위한 직교모드변환기(OMT) 4개로 구성된다. 설계된 급전구조는 전주도금(Electro Forming)과 확산접합 제작 방식에 용이하도록 설계하였으며, 제작된 모노펄스 급전구조는 네트워크 분석기를 통해 검증하였다. 제안한 두 가지 제작 방안은 측정된 포트의 신호 크기와 위상을 통해 모노펄스 신호가 잘 생성되는 것을 확인하였다.

• 여성건강간호학회지
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• 제12권1호
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• pp.47-52
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• 2006

Purpose: This study was undertaken to test effects of action oriented BSE education on knowledge, selfefficacy, and performance competence in nursing students. Methods: A non-equivalent pre-posttest of time serial quasi-experimental design was used to prevent diffusion of the experiment. Out of 53 nursing students selected by convenient sampling in the third grade at a nursing college, 27 students were randomly assigned to the control group and were first given a traditional lecture on BSE. For the experimental group of 26 students action oriented BSE education consisted of lectures, demonstrations with breast models, and BSE skill practice by micro teaching. Results: There was no significant difference in general and BSE-related characteristics between the two groups. Scores of the experimental group in knowledge, self-efficacy, and performance after the intervention were significantly higher than those of the control group. Conclusions: Results showed that action- oriented BSE education was effective in increasing knowledge, self-efficacy and performance competence in nursing students. Education for students should incorporate strategies reinforcing confidence by practicing actual BSE skills as well as acquiring knowledge of BSE, so that students can become competent and practical cancer prevention educators.

• 한국연소학회:학술대회논문집
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• 한국연소학회 제26회 KOSCO SYMPOSIUM 논문집
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• pp.65-73
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• 2003

An experimental study on flame lift-off characteristics of propane jet flame highly diluted with nitrogen has been conducted introducing acoustic forcing with a tube resonant frequency. A flame stability curve is attained according to forcing strength and nozzle exit velocity for $N_2$ diluted flames. Flame lift-off behavior with forcing strength and nozzle exit velocity is globally categorized into three; a well premixed behavior caused by a collapsible mixing for large forcing strength, a coexistent behavior of well-premixed and edge flames interacting with well-organized inner fuel vortices for moderate forcing strengths, and edge flame behavior for small forcing strengths. Special focus is concentrated on the coexistent behavior of the flame base in lifted flame since this may give a hint to a possibility which the flame base behaves like a well-mixed premixed flame in highly turbulent lifted flames. It is also shown that the acoustic forcing to self-pulsating laminar lifted flame affects flame lift-off behavior considerably which is closely related to downstream flow velocity, mixture strength, effective fuel Lewis number, and flame stretch.