• Journal of Digital Convergence
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• v.16 no.7
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• pp.429-439
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• 2018

The objective of the study was to analyze difference in cognitive function according to social isolation level in elderly Korean. The author classified the social isolation into the structural isolation and contact isolation. Structural isolation corresponded to the no spouse or no children and the contact isolation corresponded to the absence of contact with children, friends or social association. Author conducted multivariate regression analysis with the elderly people aged 65 years or older from the 5th wave of the Korean Longitudinal Study of Ageing data. Number of sample was 3,971. It was confirmed that the level of cognitive function was lower according to level of social isolation. It was also confirmed that friends/neighborhood isolation, and social activity isolation showed significant relationships with cognitive functions. Based on the results, author suggested that to protect the elderly from negative effects of social isolation, we needed the policy to promote elderly's the participation in social activity. The study to analyze the factors related to social isolation was also needed.

• 한국노년학
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• v.36 no.3
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• pp.765-783
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• 2016

This study examines 2014 National Survey on Older Koreans (10,279 persons aged 65 or above) to understand social networks among older Koreans. In order to classify the types of social relationships, the latent profile analysis is conducted based on such structural aspects of social networks as network size, frequencies of contact, and closeness. The results show that older Koreans can be categorized into 5 distinct social network types: disengaged (11.6%), ritual-family-focused (17.7%), close-family-focused (23.6%), close-restricted (28,4%), and diverse (18.8%). Characteristics by each social network type are compared and multinominal logistic regression analyses are applied to figure out the influencing factors of social network type. Older persons with disengaged social network ties tend to be overwhelmingly female, living alone, old-old, and of low socioeconomic status. On the other hand, older persons with diverse social network ties tend to be young-old and had highly-ranked jobs in their mid-life. Spouse/children are the focal point of social relationships in both ritual-family-focused and close-restricted social network. However, the proportion of men is higher in the close-family-focused type than in the ritual-family-focused. Older Koreans with close-restricted social network ties tend to be female, uneducated, and have engaged in agricultural and allied activities. This study discusses the implications of its findings and how research in this area should develop in the future.

• Journal of the Korea Society of Computer and Information
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• v.28 no.12
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• pp.33-40
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• 2023

As South Korea enters the realm of an super-aging society, the demand for elderly welfare services has been steadily rising. However, the current shortage of welfare personnel has emerged as a social issue. To address this challenge, there is active research underway on elderly care robots designed to mitigate the social isolation of the elderly and provide emergency contact capabilities in critical situations. Nonetheless, these functionalities require direct user contact, which represents a limitation of conventional elderly care robots. In this paper, we propose a solution to overcome these challenges by introducing a care robot system capable of interacting with users without the need for direct physical contact. This system leverages commercialized elderly care robots and cameras. We have equipped the care robot with an edge device that incorporates facial expression recognition and action recognition models. The models were trained and validated using public available data. Experimental results demonstrate high accuracy rates, with facial expression recognition achieving 96.5% accuracy and action recognition reaching 90.9%. Furthermore, the inference times for these processes are 50ms and 350ms, respectively. These findings affirm that our proposed system offers efficient and accurate facial and action recognition, enabling seamless interaction even in non-contact situations.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2018.06a
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• pp.27-27
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• 2018

알루미늄은 취약한 내식성을 보완하기 위하여 나노다공성의 산화물 피막을 형성하는 양극산화 처리를 주로 활용한다. 이러한 나노다공성 산화물 피막에 소수성 처리와 불용성의 윤활유를 침지하면 표면에 접촉하는 물을 비롯한 다른 유체들의 젖음성을 크게 감소시킬 수 있으며, 이로 인하여 부식성 물질이 다공성 구조물로 침입하는 것을 억제할 수 있다. 따라서 양극산화 피막에 윤활유 침지를 이용하여 알루미늄의 부식에 대한 저항성을 크게 향상시킬 수 있으며, 추가적으로 외부의 물리적인 손상에 대한 치유 능력을 얻을 수 있다. 이러한 성능뿐만 아니라 침지된 윤활유의 내구성은 나노다공성 산화피막의 물리적 형상에 따라 차이가 날 수 있다. 본 연구에서는 나노다공성의 양극산화 피막의 기공 구조를 다양하게 변화시켜 그 형상에 따라서 윤활유를 침지 후 알루미늄 소재의 내식성 및 자기 치유 특성의 차이에 대하여 알아보았다. 기공의 형상은 한쪽 끝이 막혀있는 기둥형, 후처리를 통한 확장된 기둥형 및 침상형의 기공 구조를 제조하였고, 전압제어를 통한 병목 형상의 기공 구조를 구현하여 그 특성 차이를 비교하였다. 기공들이 서로 고립된 형태를 가질수록 윤활유가 안정적으로 산화물에 침지될 수 있으며, 기공의 공간이 클수록 더 많이 윤활유를 포함하여 우수한 자기 치유 특성을 보여주었다. 병목 형상의 가공 구조는 내부의 충분한 크기의 기공 공간과 표면에 작은 기공을 가지고 있기 때문에 우수한 내구성과 자기 치유 특성을 보여준다.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2018.06a
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• pp.78-78
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• 2018

전기 아연도금은 철강의 내식성을 향상시키기 위한 희생양극으로 사용되어 왔다. 이러한 아연 도금층의 내식성은 그 아연에 의하여 부식으로부터 보호받는 철강 소재의 수명과 직결됨에 따라 아연 도금층의 성능 특히 부식저항성을 높이는 연구는 소재 수명 뿐만이라 성능의 유지하는데 있어서 매우 중요하다. 본 연구에서는 전기 아연 도금층에 표면에너지가 낮은 물질인 테플론을 얇게 코팅함으로써 발수성 표면을 구현하였다. 발수성 표면은 물에 대한 젖음성이 매우 낮기 때문에 부식 저항성이 높은 것으로 알려져 있는데, 이는 표면의 거칠기를 제어함으로써 그 효과를 극대화 할 수 있다. 본 연구에서는 특히 전기 아연 도금의 후처리로 알려진 인산염 처리를 이용하여 전기 아연 도금층의 표면형상 구조를 제어하였다. 그리고 그 표면에 테플론을 코팅함으로써 초발수 성질을 구현하였고, 이를 통해 아연 도금층의 내식성 향상에 대하여 분석하였다. 그 결과, 인산염처리에 의하여 표면형상의 구조가 거칠어질수록 테플론 코팅 후 접촉각과 물방울의 이동성은 증가하였다. 이는 표면형상에 의해서 공기층이 물방울 아래에 고립되어 있다는 것을 의미하고, 이러한 공기층으로 인하여 아연 도금층의 내식성은 크게 증가하였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2021.06a
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• pp.15-15
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• 2021

최근 기후변화에 따른 서울의 강수 특성이 변화하고 있으며, 장마철 국지성 집중호우에 의한 하천 내 고립사고 발생 등 그 피해가 가속화될 전망이다. 하천의 안전사고 예방을 위해서는 상류에서 빠르게 유입되는 유량의 계측을 통한 홍수 예·경보가 무엇보다 중요하며, 실시간 계측된 유속과 유량 정보는 하류 지역의 홍수 도달시간 확보로 한 발 빠른 대응을 가능하게 한다. 본 연구에서는 우이천 시범유역을 대상으로 총 6개 지점에 대하여 CCTV기반 자동유량계측 기술을 시범적용하였으며, 사용된 자동유량계측 지점은 기존 환경부의 월계2교, 중랑교 지점과 더불어 추가로 중랑천 월계1교지점, 우이천 본류(창번2교)와 소하천구간(인수천: 지성교, 백운천: 청담교) 지점이다. 우이천과 중랑천 합류 후에는 하도구간에 대하여 중랑교 지점에 설치된 환경부의 계측 정보를 활용하여 홍수파의 도달시간을 검증하였다. 분석결과, 유량계측 오차는 0.9~8.9%로 분석되었으며, 유속계측 오차 또한 현장 계측 결과와 10%이내의 오차범위를 보임으로서 안정된 수리량 계측이 가능함을 검증하였다. 또한, SWMM 모델링 결과와 결합하여 Flow Nomograpgh 작성을 실시하였으며, 상하류 연계 홍수 예·경보 가능성을 진단하였다. 이는 실시간 계측된 자료와 모형을 통한 시뮬레이션 정보를 활용한 유역 단위의 신뢰성 있는 유출응답(강우-유량-수위 관계) 규명을 가능하게 하였다. 향후 지방하천과 소하천의 경우, 국가하천 수준에 부합하는 표준화된 수리량 계측 체계를 마련할 필요성이 있으며, 소유역 규모의 수량-수질 수자원 기초조사자료 생산은 지방하천설계 및 관련 이·치수계획 수립에도 도움이 될 것으로 사료된다.

• Journal of Convergence for Information Technology
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• v.11 no.7
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• pp.47-56
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• 2021

This study a secondary data analysis study attempted to identify the factors influencing the successful aging of the elderly in Korea. Using the data of the 7th Aging Research Panel in 2018, 4,106 people over 65 years of age who had at least one non-living child and no missing values in the study variables were enrolled. Data were analyzed by frequency analysis, crossover analysis, independent sample t-test, and binary logistic regression analysis. The results of this study revealed that the factors affecting successful aging among elderly included age, the presence or absence of a spouse, education level, housing type, subjective health, exercise, alcohol drinking, and non-face-to-face contact frequency with non-cohabiting children, and the explanatory power of the variables was 24.1%. In order for the elderly to achieve successful aging, centering on child ties, the frequency of non-face-to-face contact, which can comfort the elderly's life and increase the satisfaction of life in a continuous relationship, is more important than having children live close and meet frequently. Based on this study, various strategies are needed for the successful aging of elderly people who are socially isolated due to concerns about COVID-19 infection.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.8
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• pp.283-294
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• 2018

The purpose of this study is to understand and describe in depth the meaning of parenting experiences of mothers with children with developmental disabilities through phenomenological methods. Participants of this study were selected by convenience sampling 11 mothers who were taking care of children with developmental disabilities who were being treated at the Welfare Center for the Disabled in C city. Data were collected from February to April, 2018 by using in-depth interview and tape-recording. The interview data were analyzed by the phenomenological analysis method of Giorgi. As the result of analysis, the following seven constituents were emerged; Regreting to delay the uncertain diagnosis, Difficulty in accommodating children with disabilities, Unbearable gaze around, Family disagreements due to children with disabilities, Adopting and dedicated to child care for disabled childre, Tiring of raising children with disabilities, Accepting children with disabilities. In conclusion, the parenting attitude of mother with developmental disability is influenced not only by the children with developmental disabilities but also by the social contact opportunities of daily life and interpersonal relationship including mothers' emotional stability and social isolation, It is considered that medical and welfare should be systematically introduced for physical, psychological and emotional support for mothers.

• Journal of the Korean Institute of Landscape Architecture
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• v.36 no.2
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• pp.69-79
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• 2008

Landscape indices are effective tools to explain the spatial structure and patterns of ecological landscape including area/density, shape, core area, isolation/proximity, contagion/interspersion, and connectivity. More than 100 indices have been developed and an increasing amount of research explains changes in urban spaces using the indices. However, landscape indices have a high level of sensitivity to the scale of analysis - grain size and extent. If the scale sensitivity of indices is not considered, the research may produce inaccurate results. This study examines the scale sensitivity of landscape indices to find relatively stable indices in the complex geographical features of Korea. The scale sensitivity was analyzed using 20 categories of grain size and 41 categories of extent change. Landsat TM and ETM+ images of five years - 1985, 1991, 1996, 2000 and 2003 - were used, and 54 class level indices mounted on the FRAGSTATS program were examined. The results are as follows: First, according to the analysis of the scale sensitivity, 19 out of 54 class level indices were found to be stable to scale change. Second, the scale sensitivity was closely related to the green area ratio, and the typical threshold of change was $40{\sim}50%$. Third, among the 16 indices which were frequently used in the research in Korea, only 6 indices were relatively stable to the scale change. These results can be an effective basis for the selection of indices in the landscape ecology research in Korea.

• The Journal of the Acoustical Society of Korea
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• v.35 no.1
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• pp.74-82
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• 2016

In this paper, a new automatic speech recognition (ASR) was proposed where ultrasonic doppler signals were used, instead of conventional speech signals. The proposed method has the advantages over the conventional speech/non-speech-based ASR including robustness against acoustic noises and user comfortability associated with usage of the non-contact sensor. In the method proposed herein, 40 kHz ultrasonic signal was radiated toward to the mouth and the reflected ultrasonic signals were then received. Frequency shift caused by the doppler effects was used to implement ASR. The proposed method employed multi-channel ultrasonic signals acquired from the various locations, which is different from the previous method where single channel ultrasonic signal was employed. The PCA(Principal Component Analysis) coefficients were used as the features of ASR in which hidden markov model (HMM) with left-right model was adopted. To verify the feasibility of the proposed ASR, the speech recognition experiment was carried out the 60 Korean isolated words obtained from the six speakers. Moreover, the experiment results showed that the overall word recognition rates were comparable with the conventional speech-based ASR methods and the performance of the proposed method was superior to the conventional signal channel ASR method. Especially, the average recognition rate of 90 % was maintained under the noise environments.