• 한국인터넷방송통신학회논문지
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• 제18권5호
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• pp.197-202
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• 2018

수십 년 전과 비교해볼 때, 세계의 고령화 인구는 계속해서 빠르게 증가하고 있는 반면 많은 선진국과 개발도상국의 출산율은 낮은 비율로 감소하고 있으며 기대 수명은 늘어날 것으로 보인다. 인구 통계학적 변화로 인해 새로운 기술 개념이 도입되어야 한다. 전천후 생활보조는 고령자들에게 삶의 질을 제공하고, 더 오래 독립적으로 살 수 있고, 노인들을 모니터링하고 돕는데 사용될 수 있는 혁신적인 형태의 기술이다. 하지만, AAL 시스템이 동작하는 동안 데이터의 크기는 계속 증가하게 된다. AAL 데이터의 크기가 증가함에 따라 효율적인 관리가 더욱 어렵게 된다. 따라서, 본 논문에서는 수집된 AAL 데이터 특성을 고려하여 AAL 시스템을 위한 데이터 관리 기법을 제안한다. 시뮬레이션 결과는 제안된 데이터관리 기법이 공간적 효율성을 보다 높게 달성 할 수 있음을 보여준다.

• 한국주거학회논문집
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• 제20권5호
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• pp.113-122
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• 2009

The purpose of this study is to offer and analysis the stage of elderly in order to improve the quality of living environment of elderly in Korea. Taking into account the retirement age in Korea, those households with people over 60 years old were chosen for the investigation. For the study methods, an examination of documents centering on previous related studies and the analysis of references from the National Statistical Office, from which a general social situation can be clearly obtained, are used. The results are as follows; From viewpoint of the stage of elderly, Parents and children of families mostly live together stage 1 and 2, mostly live separately at stage 3, the rate of living together increases stage 4 and 5. In over stage 4, there are some cases in which the Korean tradition of three generations living under one roof appears as well. The residing period at one place becomes longer as people grow older, which shows clearly the characteristic of 'ageing in place', therefore in order to continue to provide housing support to the elderly, the characteristics of each elderly stage will have to be considered. In the life of the elderly, more and more hobby groups and meetings among the older population have been created, which means that elderly centered social activities will become more various, and facilities and community activated methods will have to be provided accordingly. Elderly people become less adaptable in new housing environments as they get older, therefore the housing has to accommodate their capability to adapt and the degree of aging. The stage of elderly can be used as a basic reference for a more effective solution when planning elderly housing in the future.

• Journal of Mechanical Science and Technology
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• 제20권7호
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• pp.1002-1011
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• 2006

In this study, we describe the conventional hot pressing (CHP) of layered $Al-B_4C$ composites and their characterization. The matrix alloy Al-5 wt.%Cu was prepared from elemental powder mixtures. The metal and B4C powders were mixed to produce either $Al-Cu-10vol.%B_4C$ or $Al-Cu-30vol.%B_4C$ combinations. Then, these powder mixtures were stacked as layers in the hot pressing die to form a two-layered composite. Hot pressing was carried out under nitrogen atmosphere to produce $30\times40\times5mm$ specimens. Microstructural features and age hardening characteristics of composites were determined by specimens cut longitudinally. The flexural strength of both layered composites and their monolithic counterparts were investigated via three point bending tests. In the case of layered specimens of both $10vol.%B_4C$ and $30vol.%B_4C$ containing layers were loaded for three-point test. The results show that a homogeneous distribution of $B_4C$ particles in the matrix alloy which is free of pores, can be obtained by CHP method. The ageing behavior of the composites was found to be influenced by the reinforced materials, i.e. higher hardness values were reached in 8 hrs for the composites than that for the matrix alloy. Flexural strength test showed that two-layered composites exhibited improved damage tolerance depending on layer arrangement. Microstructural investigation of the fracture surfaces of the bending specimens was performed by means of scanning electron microscope (SEM). While layer with lower reinforcement content exhibited large plastic deformation under loading, the other with higher reinforcement content exhibited less plastic deformation.

• 가정과삶의질연구
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• 제34권2호
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• pp.15-27
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• 2016

This study examined intergenerational contact and financial support exchange between parents and each of their non-coresident married children. Prior qualitative work has suggested that increased contact between parents and their married daughters may indicate a decline in patrilineal norms in contemporary Korean families. Using a nationally representative sample, this study investigated if married daughters engage in similar levels of intergenerational contact and financial support exchange with their parents in contrast to their married brothers (first-born sons in particular). The data were drawn from the first wave of the Korean Longitudinal Study of Ageing (KLoSA, 2006). For analyses, individuals who had at least one non-coresident married child were selected, resulting in the analytic sample of 3,950 parents with 10,947 non-coresident married children. Both regression with robust standard errors and sibling fixed effects regression models were estimated using the reg and xtreg procedures in STATA. Residential proximity and sociodemographic characteristics of both parents and children were controlled in analyses. Findings suggest that, overall, parents report more frequent face-to-face contact with and financial support from their first-born sons in comparison to other sons and daughters. Daughters, on the other hand, were found to engage in more frequent contact via phone call, mail, or email with their parents. In conclusion, we did not find a strong evidence to support the contention that patrilineal norms have softened in contemporary Korean families to the extent that has been suggested in qualitative studies.

• 한국의류산업학회지
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• 제17권1호
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• pp.11-21
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• 2015

This study analyzed the expressive phenomenon of a blurred boundary in fashion jewelry focused on the relationship between fashion jewelry and costume or fashion jewelry and body. The method of this study was to analyze recent documentaries about jewelry theories in regards to 607 cases of fashion jewelry design in fashion books, fashion magazines, fashion internet sites from 2000 to 2014. The results were: First, phenomenon of blurred boundary between fashion jewelry and costume was expressed in a see-through wear form made of luxury material (gold and diamond) or paste material, a similar form (like fashion accessories made of crystal, bids, and gold chain), an integration of fashion accessories and jewelry, and an attached jewelry on fashion accessories. It reflected a rearrangement of conventional relationships, a blurred relation of function and meaning, dissolution of jewelry form stereotypes, jewelry styling, a harmony of function and decoration, and an alteration to the central role of a fashion image. Second, the phenomenon of a blurred boundary between fashion jewelry and body was expressed in a body organ wrapping, body surface adhesion and sculptural jewelry based on body pose. It reflected a separation from conventional space of jewelry expression, a realization of mystery and fantastic, an expression of new body surface and a blurred boundaries of fashion jewelry and body art. Aesthetic characteristics were analyzed into metaphor and integration by separation from the conventional relationship of fashion jewelry and costume or fashion jewelry and body.

• 한국주조공학회지
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• 제21권1호
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• pp.7-14
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• 2001

The research on new DRA(discontinuous reinforced alloy) and CRA(continous reinforced alloy) composites has been carried out to improve the properties of ceramic fiber and particle reinforced metal matrix composites(MMCs). Effects of alloying elements and aging conditions on the microstructures and aging behavior of Al-Si-Cu-Mg-(Ni)-SiCp composite have been examined. The specimens used in this study were manufactured by duplex process. The first squeeze casting is the process to make precomposite and the second squeeze casting is the process to make final composite. The hardening behavior was accelerated with decreasing the size of SiCp particle in the composites. It is considered that the dislocation density increased with increasing SiCp size, due to the different thermal deformation between Al matrix and SiCp during quenching after the solution treatment. Peak aging time to obtain the maximum hardness in 3 ${\mu}m$ SiCp reinforced Al composite was reduced than that in large size(5, 10 ${\mu}m$) of SiCp because of difference in dislocation density. Aging hardening responce(${\Delta}H$ = $H_{Max}.-H_{S.T}$) of composites was greater than that of unreinforced Al alloy because of higher density of second phases in matrix.

• 한국미생물학회:학술대회논문집
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• 한국미생물학회 2009년도 International Meeting of the Microbiological Society of Korea
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• pp.78-78
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• 2009

$^1H$ NMR spectroscopy coupled with multivariate statistical analysis was used for the first time to investigate metabolic changes in musts during alcoholic fermentation and wines during ageing. Three Saccharomyces cerevisiae yeast strains (RC-212, KIV-1116 and KUBY-501) were also evaluated for their impacts on the metabolic changes in must and wine. Pattern recognition (PR) methods, including PCA, PLS-DA and OPLS-DA scores plots, showed clear differences for metabolites among musts or wines for each fermentation stage up to 6 months. Metabolites responsible for the differentiation were identified to valine, 2,3-butanediol (2,3-BD), pyruvate, succinate, proline, citrate, glycerol, malate, tartarate, glucose, N-methylnicotinic acid (NMNA), and polyphenol compounds. PCA scores plots showed continuous movements away from days 1 to 8 in all musts for all yeast strains, indicating continuous and active fermentation. During alcoholic fermentation, highest levels of 2,3-BD, succinate and glycerol were found in musts with the KIV-1116 strain, which showed the fastest fermentation or highest fermentative activity of the 3 strains, whereas the KUBY-501 strain showed the slowest fermentative activity. This study highlights the applicability of NMR-based metabolomics for monitoring wine fermentation and evaluating the fermentative characteristics of yeast strains.

• 공업화학
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• 제27권6호
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• pp.555-564
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• 2016

대기 중 이산화탄소의 재활용 기술과 재생에너지에 의한 물 분해 기술의 접목이 최근 가능해지면서 메탄올은 많은 관심을 받고 있다. 경제성이 유리하도록 메탄올 경제를 실현하기 위해서는 고활성 메탄올 합성 촉매를 제조하여야 하며, 이를 위해서는 논리적인 접근법이 필요하다. 공침법을 통해 제조하는 Cu/ZnO 기반의 촉매는 침전, 숙성, 여과, 세척, 건조, 소성, 환원 등의 복잡한 단계로 제조되며, 100년의 역사를 가지고 있음에도 불구하고 최근에야 침전 화학과 촉매 나노구조에 대한 기초적인 이해가 이루어지고 있다. 이에 본 고에서는 단계별로 합성 변수가 침전, 소성, 환원상태 물질의 물성에 미치는 영향에 대한 최근 결과들을 리뷰하고, 화학적 기억 효과라고 부르는 이들 물성들과 최종 촉매의 활성 사이의 관련성을 논의하였다. 제조 변수별 설명은 메탄올 합성을 위한 Cu/ZnO 기반 고활성 촉매를 제조하는 방법에 초점이 맞추어져 있다. 논의된 합성 전략은 공침법을 기반으로 하는 타 금속 또는 금속 산화물 담지 촉매의 제조에 활용 가능할 것으로 판단된다.

• 보건행정학회지
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• 제26권4호
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• pp.333-342
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• 2016

Background: The use of therapeutic materials based on new health technology has increased in recent years in the field of medicine, raising concerns for medical practitioners regarding increased spending on the new therapeutic materials amid the rapid population ageing and increase of chronic diseases in Korea. While therapeutic materials have significant importance in the health care system, they have not been given appropriate attention in the academic world of Korea. The purpose of this study is to identify factors that affect the growth of expenditure on therapeutic materials and to derive implications for an effective management considering the diversity of therapeutic materials. Methods: Using the claims data of the National Health Insurance Services, specific utilization patterns of groups of therapeutic materials in the middle classification level of Health Insurance Review and Assessment Service from 2007 to 2014 were analyzed. Four categories (J5083: drug eluting coronary stent, D0302: nonmetallic anchor, K6014: gauze, K6023: gauze) that exhibit unique patterns with respect to price and volume were selected. Then, decomposition analysis was performed to identify the largest contributor to the spending growth by dividing the products into existing, new, and abandoned products for the period between 2010 and 2013. Results: The effect of new products had larger impact on spending growth than the effect of core items in drug eluting coronary stent (J5083) and nonmetallic anchor (D0302). In addition, existing products in general included items priced relatively lower when compared with another item manufactured by the same company. In the gauze category, however, existing products had the largest impact on expenditure and the effect of volume was greater than that in other categories. Conclusion: This study provides evidence that appropriate management measures classified by the characteristics of therapeutic materials are required for therapeutic materials pricing and reassessment in Korea.

• 보건의료산업학회지
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• 제8권2호
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• pp.197-208
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• 2014

This study examined the relationship between social support and depressive symptom among the middle and old-aged people, using dataset of the Korean Longitudinal Study of Ageing(KLoSA 3rd). The subjects were 7,874 persons aged 45 and over. Using this data, social support variables and its relation to depressions was observed based on social network model. A multiple regression model was used to study an association between social support and depressive symptom, controlling for socio-economic characteristics, health status and behavior. Also, this paper run two subgroup regression models based on gender of subjects (male, female), controlling for confounding variables. Authors found that there was lower the number of meetings with friends (1~3 times in a week: b=0.597, p<0.0001; 1~2 times in a month: b=0.609, p<0.0001; 1~6 times in a year or under: b=1.598, p<0.0001) and negative relationship between spouse satisfaction (b=-0.007, p=0.0237), children satisfaction (b=-0.019, p<0.0001) and depressive symptom. Also quantitative effect differences were compared according to gender and its effect on depression. Compared to the male group, female group showed significant difference in quantitative effect with number of meetings with friends and spouse satisfaction, but children satisfaction didn't show clear differences according to gender. This study suggested the importance of social support for promoting mental health among the middle and old-aged people.