• 한국신재생에너지학회:학술대회논문집
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• 2011.05a
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• pp.94.2-94.2
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• 2011

In this work, multi-functional groups, i.e., nitrogen and oxygen, contained microporous carbons (MF-MCs) were prepared by the one step carbonization of the poly(vinylidene chloride-co-acrylonitrile-co-methyl methacryalte) (PVDC-AN-MMA) without activation. The electrochemical performance of MF-MCs was investigated as a function of carbonization temperature. It was found that MF-MCs had a high specific surface area over $800m^2/g$ without additional activation, resulting from the micropore's formation by the release of chlorine groups. In addition, although functional groups decreased, specific surface area was increased with increasing carbonization temperature, leading to the enhanced electrochemical performance. The pore size of the carbon distributed mainly in small micropore of 1.5 to 2 nm, which was idal for aqueous electrolyte. Indeed, the unique microstructure features, i.e. high specific surface area and optimized pore size provided high energy storage capability of MF-MCs. These results indicated that the microporous features of MF-MCs lead to feasible electron transfer during charge/discharge duration and the presence of nitrogen and oxygen groups on the MF-MCs electrode led to a pseudocapacitive reaction.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04a
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• pp.460-462
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• 2004

분산 환경에서의 효과적인 통신 방법인 멀티캐스트 프로토콜이 그동안 많이 연구되었다. 하지만 인터넷 기반 네트워크의 급속한 발달로 실시간 데이터를 요구하는 환경으로 변화함에 따라 실시간 멀티캐스트 프로토콜의 필요성이 대두되었다. 실시간 프로토콜 중 하나인 RFRM(Release-time based Fault-tolerant Real-time Multicast protocol)은 메시지의 신뢰성을 보장하고 뷰의 일관성을 유지하며 고장을 감내한다는 장점이 있지만 한 개의 그룹만을 지원한다는 단점을 가지고 있다. 따라서 본 논문에서는 실시간 멀티캐스트 프로토콜인 RFRM을 확장하여 멀티그룹을 지원하는 뷰 관리기능을 추가하였고, 그 성능을 분석하기 위하여 Erlang/OTP를 사용하여 구현된 결과를 TMO(Time-triggered Message-triggered Object) 모델을 사용한 실시간 시뮬레이션의 결과와 기존의 RFRM의 그룹 연산 성능과 비교하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2001.04b
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• pp.469-471
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• 2001

오늘날 공동작업 환경을 필요로 하는 그룹에 있어서 그룹내의 구성원들은 보다 효율적인 정보의 교환과 공유를 원한다. 따라서 그룹에서 발생한 정보의 공유와 체계적인 관리, 구성원간의 실시간 의사교환 등의 기능을 지원하는 공동작업시스템이 필요하게 되었다. 이러한 요구를 충족시키는 통합 시스템으로 정보의 공유공간과 문서의 관리 그리고 실시간 메시지 전달 기능을 제공하는 CoWare 시스템이 개발되었다. 기존 CoWare 시스템은 CGI 기반으로 개발되어 코드의 재사용이 어렵고, 서버가 과부하 되는 문제점이 있다. 본 논문에서는 이를 보완하고자 컴포넌트 기반으로 시스템을 재 설계함으로써 서비스의 질과 서버의 확장성 및 성능을 향상시켰다. 또한, 다중 사용자 요청을 효과적으로 처리하고 안정적인 서비스를 지원하기 위하여 MTS를 이용하여 개발하였다.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10a
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• pp.412-414
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• 1998

대규모의 분산 응용시스템은 일반적으로 다수의 구성요소로 이루어져 있으며, 그 구성요소간의 상호작용을 위해 필요한 이벤트의 전달 구조가 다소 복잡한 특성을 지닌다. 이러한 이벤트의 다중처리 문제는 나이도가 높은 구현기법 중 하나이므로, 보다 안정적인 분산 응용시스템을 효율적으로 개발하기 위해서는 이벤트의 다중처리를 위한 기반 시스템을 제작, 지원하는 것이 바람직하다. 본 논문에서는 Java에서 분산객체개념을 도입한 JavaRmi환경에서 이벤트의 체계적인 다중처리를 위한 서비스를 설계함으로써, Java개발자가 보다 안정적이고 효율적인 방법으로 분산응용시스템을 구축할 수 있도록 지원하기 위한 방법을 제안하고자 하였다. 본 논문에서는 제안한 JavaRmi이벤트 서비스 시스템은 JavaRmi를 기반으로 하여, JavaRmi시스템이 지닌 효율성과 대중성의 잇점을 충분히 활용할 수 있도록 설계되었다. 이러한 기본적인 잇점 이외에도 이벤트 서비스의 설계에 있어서 직관적인 인터페이스, 그룹별 이벤트 서비스의 생성과 관리 기능. 병행성과 동기화 도구 등의 기능을 추가하여, 분산 응용시스템의 개발시 자주 요구되는 이벤트 처리를 위한 Java 개발자의 노력을 최소화할 수 있도록 지원하고자 하였다.

• Therapeutic Science for Rehabilitation
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• v.12 no.3
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• pp.61-77
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• 2023

Objective : This study analyzed the correlation between cognitive function and oral health-related quality of life (OHQoL). Methods : Demographic and clinical characteristics were extracted and utilized for subjects aged 45 years or older who participated in the 8th Korean Longitudinal Study on Aging in 2020. The dependent variable was the Geriatric Oral Health Assessment Index, and the independent variable was the level of cognitive function classified by the Mini-Mental State Examination scores. The analysis method used inverse probability of treatment weighting (IPTW). Then, the association between cognitive function and OHQoL was analyzed by multiple regression analysis. Results : Among the participants, 4,367 (71.40%) had normal cognition, 1,155 (18.89%) had moderate cognitive impairment, and 594 (9.71%) had severe cognitive impairment. As a result of analysis by applying IPTW, there was a negative correlation between the cognitive function group and OHQoL (normal vs. moderate: β = -2.534, p < .0001; normal vs. severe: β = -2.452, p < .0001). Conclusion : After propensity score matching, mild cognitive impairment showed a more negative association than severe cognitive impairment. Therefore, patients with cognitive impairment require oral health management education to improve OHQoL regardless of the level of cognitive impairment.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.181-182
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• 2009

본 논문에서는 IEEE 802.15.4a 근거리 무선 네트워크를 이용하여 다중 이동 로봇을 사용자 휴대 단말을 이용하여 실시간으로 편리하게 제어하기 위한 플랫폼을 설계하고 그 기본기능을 검증한다. 제안한 원격제어 플랫폼은 IEEE 802.15.4a 기반의 최초의 원격제어 플랫폼으로서 그 의의를 가지며, 자동 스페이싱(auto-spacing)을 기반한 다중 로봇 그룹이동과 IEEE 802.15.4a의 거리측정 기능과 초음파 및 자이로센서를 이용한 상대각측정 기능을 이용한 협동위치인식(cooperative localization) 기능을 제공하는데 기존 기법들과의 차별성이 존재한다.

• Korean Journal of Clinical Laboratory Science
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• v.51 no.1
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• pp.105-113
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• 2019

This study examined the effects of geriatric depression and geriatric stress on cognitive impairment. In particular, the dementia groups were divided into Alzheimer's disease and vascular dementia. A normal group was used as the control group. For each group, the geriatric depression using the geriatric depression scale (GDS) and geriatric stress using the geriatric stress scale (GSS) was compared with the regression and correlation results of cognitive impairment. Statistical tests, such as descriptive statistics, Kruskall-Wallis, correlation analysis, and multiple regression analysis, were performed. For the Alzheimer's group, the GDS and GSS correlated with the cognitive impairment, but only the GDS showed a cause-and-effect relationship with cognitive impairment. In particular, the male group with Alzheimer's disease showed clear confirmation. In addition, geriatric stress was found to be associated with geriatric depression. In conclusion, geriatric depression affects the cognitive impairment directly and geriatric stress affects the cognitive ability indirectly through geriatric depression. In this study, the Alzheimer's disease, vascular dementia, and control groups had a small sample size. Therefore, the external validity in future studies can be increased using a larger sample size for each group.

• The Journal of the Korea Contents Association
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• v.21 no.8
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• pp.640-650
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• 2021

The purpose of this study was to identify factors affecting the Quality of Life of Ankylosing Spondylitis Patients Based on Korean Bath Ankylosing Spondylitis Disease Activity Index (KBASDAI) and Korean Bath Ankylosing Spondylitis Functional Index (KBASFI). The subjects of this study were 19 years of age or older who were diagnosed with ankylosing spondylitis(AS). Data was collected through an online survey. A univariate analysis of differences in quality of life according to variable characteristics was performed, and multiple regression analysis was performed to examine factors affecting quality of life. As a result of regression analysis, the higher the KBASFI (𝛽=0.622, p<0.001) and the KBASDAI (𝛽=0.180, p=0.032) scores, and the lower the average monthly household income(𝛽= 0.186, p=0.001), the worse the quality of life. In order to improve the quality of life of AS patients, intervention studies that can lower disease activity and improve function are needed.

• Journal of KIISE:Computing Practices and Letters
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• v.6 no.2
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• pp.120-134
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• 2000

In this paper we present a Distributed Object oriented Virtual computing Environment, called DOVE which consists of autonomous distributed objects interacting with one another via method invocations based on a distributed object model. DOVE appears to a user logically as a single virtual computer for a set of heterogeneous hosts connected by a network as if objects in remote site reside in one virtual computer. By supporting efficient parallelism, heterogeneity, group communication, single global name service and fault-tolerance, it provides a transparent and easy-to-use programming environment for parallel applications. Efficient parallelism is supported by diverse remote method invocation, multiple method invocation for object group, multi-threaded architecture and synchronization schemes. Heterogeneity is achieved by automatic data arshalling and unmarshalling, and an easy-to-use and transparent programming environment is provided by stub and skeleton objects generated by DOVE IDL compiler, object life control and naming service of object manager. Autonomy of distributed objects, multi-layered architecture and decentralized approaches in hierarchical naming service and object management make DOVE more extensible and scalable. Also,fault tolerance is provided by fault detection in object using a timeout mechanism, and fault notification using asynchronous exception handling methods

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.5
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• pp.549-556
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• 2017

This study investigated the importance of social cognitive intervention and the cognitive rehabilitation intervention by comparing the difference and examining the relationship between neurological cognitive function and social cognitive function of stroke patients in the acute phase and chronic stroke before returning to the community. LOTCA, cartoon intention inference task, and social behavior sequence task were performed on 30 acute stroke inpatients and 30 chronic stroke patients from May 2015 to June 2016. A two sample t test was conducted to examine the differences between the groups. The Pearson's correlations test was performed to examine the correlation among the variables in each group. As a result, there were statistically significant differences between the neurological cognitive function and social cognitive function of acute stroke patients and chronic stroke patients who were undergoing rehabilitation training before returning to the community (p<0.05). A linear relationship was found between the thinking operation and social behavior sequence task in the acute stroke group (r=0.539, p<0.05). In the chronic stroke group, visual perception (r=0.530, p<0.05), visual motor organization (r=0.655, p<0.05) and thinking operation (r=0.534, p<0.05) were correlated with the cartoon intention inference task. In addition, the social behavior sequence task were correlated with visual organization (r=0.534, p<0.05) and thinking operation (r=0.764, p<0.05). As a result of multiple regression analysis, the neurological cognitive functions influencing the social cognitive function in the cartoon task was found to be the thinking operation (B = 0.431) in acute stroke patients and the thinking operation (B=0.272) and visuomotor organization (B = 0.218) in the case of chronic stroke. In addition, the results of the social behavior sequence task revealed the thinking operation (B=0.417) in the acute stroke patients, and thinking operation (B=0.267), visual motor organization(B=0.274) and visual perception(B=151) in chronic stroke patients to be significant. According to this result, there is a difference in the neurological and social cognitive levels between the two groups. Therefore, the social cognition is strongly related to the high level cognitive function as thinking operation of the neurological cognitive function. Therefore, in further research, it would be necessary to determine if there is a change in higher cognitive function in neurological cognitive function after applying a social cognition intervention program for stroke.