• Journal of Digital Convergence
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• v.20 no.2
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• pp.37-45
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• 2022

The purpose of this study is to determine social values of self-support enterprises, known as the origin of social economy by using a qualitative research method. Main themes representing social values of self-support enterprises were developed through four sessions of FGI and thematic analysis. First, self-support enterprises embody the value of 'social safety net' by providing workfare for disadvantaged people as well as by operating market-oriented business. Additionally, 'communal spirit', for which self-support enterprises strive, is social value that enables the entirety of self-support enterprises and participants to fulfill non-profit values, reciprocity, and sharing. Lastly, ontological, diachronic, and ecological 'sustainability' of self-support enterprises is a foundational element which creates continuous positive impact on our society. Findings of this study are significant to provide theoretical and empirical evidence for preservation and development of the social economy ecosystem. Based on this, further researches on comprehensive social economy are suggested.

• Journal of the Korean Recycled Construction Resources Institute
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• v.11 no.4
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• pp.316-323
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• 2023

The need for sustainable waste management has intensified the focus on recycling prestressed concrete sleepers used in railways. Given their high volume and environmental impact at the end of their service life, finding efficient recycling methods is crucial. This study explores current recycling approaches, particularly mechanical techniques, evaluating their advantages, limitations, and economic feasibility. Finally, an example of mechanical recycling was performed. The analysis results of the resulting recycled aggregates are suggested. Then, the non-cement concrete mixtures with recycled aggregates were designed, and their strength development was analyzed.

• Korean journal of applied entomology
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• v.63 no.1
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• pp.13-23
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• 2024

Vespa velutina nigrithorax du Buysson, 1905 is the invaded species in Korea since 2003. Since its importance as the honey bee pest, beekeepers use insecticides to kill the adult and immature hornets. However, its legality and effectiveness has not been confirmed. This study investigated the susceptibility of insecticides commonly used to control hornets by beekeepers in Korea. Eight insecticides were tested on adult worker and larvae by topical or oral treatment. Adults showed more than 70% mortalities from Clothianidin, Dinotefuran, and Carbosulfan treatment within 30 minutes. Bifenthrin and Cartap hydrochloride showed relatively low toxicity. The median lethal dose (LD₅₀) for Clothianidin, Dinotefuran, and Carbosulfan was 0.29, 0.65, and 2.21 ㎍/bee, respectively. In larval feeding test where 5^th instar larvae were fed 3 times every 24 hours, the mortality began after second treatments. After 3rd treatments (72 h), all insecticides showed mortality more than 70%. The LD₅₀ values of Clothianidin, Dinotefuran, and Carbosulfan to V. velutina were approximately 10 to 100 times higher than those to honey bee, Apis mellifera. This study provides the basic information of those chemical toxicities to Vespa hornet and honey bees.

• 한국노년학
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• v.40 no.4
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• pp.707-727
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• 2020

This study aims to empirically analyze the role that perception of the probability of lonely death among the elderly people living alone plays in the relationship between perceived social support and preference for institutional care based on Andersen's expanded Behavioral Model (2002). The subjects (n=676) of this study were the elderly people living alone, extracted from the "2018 Seoul Aging Survey." With "perceived social support" as an independent variable, "preference for institutional care" as a dependent variable, and "perception of the probability of lonely death" as a mediator variable, we conducted a Binary Logistic Regression to follow the three steps of analyzing mediation effect, as suggested by Baron and Kenny (1986). The results showed that perceived social support has a negative effect on the preference for institutional care and perception of the probability of lonely death among the elderly people living alone; at the same time, perception of the probability of lonely death was found to have a positive effect on their preference for institutional care. Lastly, perception of the probability of lonely death was found to partially mediate the effect of perceived social support among the elderly people living alone in terms of their preference for institutional care. Based on these findings, the practical implications of this study can be summarized as follows. First, various programs and support should be provided to the elderly people living alone in order to enhance the level of perceived social support, a factor that has been confirmed to increase preference for institutional care among the elderly people living alone. Second, as the perception of the probability of lonely death was confirmed to be a psychosocial factor of the preference for institutional care, we need to promote education and support for older people living alone to prepare them for lonely death. These efforts are expected to form a foundations for implementing a community-based integrated care system, "Aging in Place," which is the policy direction required for older people care.

• Membrane Journal
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• v.14 no.3
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• pp.185-191
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• 2004

It summarized about the properties of thermochemical water-splitting iodine-sulfur process that was hydrogen production using the waste heat from the High Temperature Gas-Cooled Reactor (HTGR) recycling the heat of nuclear power. It was mainly explained about the application of membrane separation technique in IS process. Thermochemical water-splitting hydrogen production method using the high temperature nuclear thermal energy could be realized and remained to be solved the investigation subject. And, it is possible for mass-production of hydrogen such as one of the clean energy in future.

• Journal of Advanced Navigation Technology
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• v.5 no.1
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• pp.19-25
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• 2001

In this study an analysis on flight characteristics and flight control methods for a wing in ground effect vehicle is made. In order to closely view its nonlinearity a few limit cycles are examined and related to the characteristics of the linearized systems. Several flight control methods are compared for the cruise mode with initial height error and command tracking mode of ascending, cruise, and descending. In comparison performance and the implementation aspects are examined. For the possible control inputs, combinations of elevator, thrust, and flap are considered and LQR-based output command tracking scheme is applied in the control system design.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.1
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• pp.402-410
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• 2014

This paper suggests a preceding study to introduce implementing problems and improving direction when commercializing a ropeless elevator. In this study, the implementation of the study of pilot systems in order to produce the ropeless elevator and also build a linear velocity sensor, this system is applied to the speed control experiment was investigated through testing. Speed control test is carried out in all track including a curved section. This study verified the feasibility of the ropeless elevator and its drive controller is good enough to be accepted. This study also extracted many more problems that still need to be improved in the future for commercializing such as the sensor, high-performance controller, precision structures, safety devices, efficiency improvements and so on.

• 한국HCI학회:학술대회논문집
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• 2006.02a
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• pp.63-68
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• 2006

본 논문은 옛 궁궐 또는 민속마을과 같이, 어떠한 사건 또는 상황과 관계 있는 문화관광지를 관광하는데 있어서 몰입적 체험관광 시스템이 갖는 효용성을 탐구한다. 현재까지 대부분의 국내 문화관광지는 정적이고 정보전달 중심인 고전적 관람 형태를 유지하고 있다. 이는 관광 형태가 새로운 경험을 추구하는 방향으로 변화하고 문화 관광산업의 규모와 중요성이 커져가는 추세에서 해결해야 할 과제로 부각되고 있다. 본 연구에서는 이를 개선하기 위한 일환으로 몰입적 체험관광 개념을 탐구하였다. 몰입적 체험관광이란, 유적지 및 사적지 유형의 관광지에서 관련된 실황을 마치 시간여행을 하듯 생생하게 체험하는 관광 방식을 의미한다. 본 개념을 실현하기 위해 증강현실 기술을 활용하였으며 문화관광지에 적용할 수 있는 시스템을 고안하였다. 이 시스템은 한 장소에 고정되는 포스트 형태로 시청각적 증강현실을 구현하여 몰입적 체험 관광을 제공한다. 실제 유적지에서 일반관람객들을 대상으로 시청각적 증강현실 체험을 실험한 결과, 흥미와 현장감이 향상됨과 동시에 컨텐츠에 대한 이해도 또한 향상되는 것을 확인할 수 있었다. 이러한 연구 과정을 통해 유적지 및 사적지 유형의 문화관광지에서 관광의 질을 높일 수 있는 몰입적 체험관광의 효과와 가능성을 확인할 수 있었다. 더 나아가, 본 연구는 기술의 새로운 적용 방법을 통해 새로운 경험을 창출하는 측면에서 의의를 갖는다.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.44 no.11
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• pp.56-64
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• 2007

We developed the first automatic design system targeting a promising hybrid CMOS-Nanoelectronics Architecture called CMOL. The CMOL architecture uses NOR gates to implement combinational logic. In this hybrid CMOS-nanoelectronics architecture, logical functions and the interconnections share the nanoelectronics hardware resource. Towards automating the CMOL physical design process, we developed a model for the CMOL architecture, formulated the placement and routing problems for the CMOL architecture subject to the unique CMOL specific constraints, and solved it by combining a placement algorithm with a gate assignment algorithm in a loop. We validated the proposed approach by implementing several industrial strength designs.

• Korean Chemical Engineering Research
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• v.49 no.5
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• pp.505-509
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• 2011

Visible light-activated photocatalysts (based on doped titania) are the subject of intensive current research due to the promise they offer in relation to solar powered systems for photocatalysis, hybrid systems for $CO_2$ conversion and hydrogen production from water. Current synthetic methodologies suffer from one or more serious shortcomings, which seriously hinder practical application. These include high cost, irreproducibility, difficulty in controlling the dopant level and unsuitability for scale up. In this review new reproducible and controllable methods (developed by Lambert group, Cambridge University) allowing the synthesis of practical quantities of efficient, visible light active anion (e.g. N, C and B) doped $TiO_2$ photocatalysts are summarized.