• Journal of Semiconductor Engineering
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• 제1권1호
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• pp.13-30
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• 2020

Radio frequency (RF) energy harvesting technology have become a reliable and promising alternative to extend the lifetime of power-constrained wireless networks by eliminating the need for batteries. This emerging technology enables the low-power wireless devices to be self-sustaining and eco-friendly by scavenging RF energy from ambient environment or dedicated energy sources. These attributes make RF energy harvesting technology feasible and attractive to an extended range of applications. However, despite being the most reliable energy harvesting technology, there are several challenges (especially power conversion efficiency, output DC voltage and sensitivity) poised for the implementation of RF energy harvesting systems. In this article, a detailed literature on RF energy harvesting technology has been surveyed to provide guidance for RF energy harvesters design. Since signal strength of the received RF power is limited and weak, high efficiency state-of-the-art RF energy harvesters are required to design for providing sufficient DC supply voltage to wireless networks. Therefore, various designs and their trade-offs with comprehensive analysis for RF energy harvesters have been discussed. This paper can serve as a good reference for the researchers to catch new research topics in the field of RF energy harvesting.

• 한국실내디자인학회논문집
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• 제26권1호
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• pp.53-62
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• 2017

It is very important for the elderly to maintain their independence and to live safe and comfortable daily lives in order to lead an independent life. The bathroom in the house has the greatest number of fall accidents and has a great influence on the independence of the elderly. Therefore, the purpose of this study is to develop a bathroom design method that improves the independence of the elderly whose physical function is deteriorated through preventing falls. In this study, first of all, we investigated the causes of falling in bathrooms based on the previous studies, and identified the intelligent services that can prevent falls and selected them according to individual needs. Secondly, we investigated the bathroom size of the apartment among the various housing type, analyzed the type of the bathroom, and developed a standard type of the bathroom. Thirdly, we analyzed the design guidelines for the elderly residents in Korea and proposed improvement directions. We also divided the intelligent sanitary appliances and fall-prevention products and proposed the installation method and directions. Therefore, the comprehensive bathroom design standards and proposals proposed in this study will be the basis of bathroom design to prevent falls and improve independence of the elderly, and it will be easy to understand and help the designer in designing. Finally, this study is meaningful in that it provides independence of the elderly through fall prevention and increases the easiness of hygiene action and suggests direction to maintain self-sustaining life of the elderly.

• 열처리공학회지
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• 제31권4호
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• pp.171-179
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• 2018

Copper powder dispersed with 4 vol.% of $Cr_2O_3$ was successfully produced by a simple milling at 210 K with a mixture of $Cu_2O$, Cu and Cr elemental powders, followed by Hot Pressing (HP) at 1123 K and 50 MPa for 2h to consolidate the milled powder. The microstructure of the HPed material was characterized by standard metallographic techniques such as XRD (X-ray Diffraction), TEM and STEM-EDS. The results of STEMEDS analysis showed that the HPed materials comprised a mixture of nanocrystalline Cu matrix and $Cr_2O_3$ dispersoid with a homogeneous bimodal size distribution. The mechanical properties of the HPed materials were characterized by micro Vickers hardness test at room temperature. The thermodynamic considerations on the heat of formation, the incubation time to ignite MSR (Mechanically induced Self-sustaining Reaction), and the adiabatic temperature for the heat of displacement reaction between the oxide-metal are made for the delayed formation of $Cr_2O_3$ dispersoid in terms of MSR suppression. The results of TEM observation and hardness test indicated that the relatively large dispersoids in the HPed materials are attributed to the significant coarsening for the high temperature consolidation; this leads to the low Vickers hardness value. Based on the thermodynamic calculation for the operating processes with a limited number of parameters, the formation kinetics and coarsening of the $Cr_2O_3$ dispersoid are discussed.

• 한국중재학회지:중재연구
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• 제31권2호
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• pp.99-118
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• 2021

The participants in this study were university students, who are millennials and familiar with various devices and SNS enabling hyper connection, such as smartphones, the Internet, and the Internet of Things. People are sustaining their relationships with others by using the latest technology and cutting-edge devices at will. Some purchases are made at offline stores through online information, but products are checked through offline stores and purchased online. The MZ generation, which does not always have a fixed and constant behavioral response pattern, was considered a participant in this study because the response pattern may vary depending on one's tendency to avoid uncertainty. As a result of experimenting with the MZ generation, similar results were found in all dependent variables. Advertorial and general ads treated as independent variables affected the participants' tendency to avoid uncertainty. In other words, uncertainty avoidance tendency and interaction effect were found as a result of verifying the effects on the dependent variable of ads type. In an advertorial, the group with low uncertainty avoidance tendencies showed higher dependent variable effects than the group with high uncertainty avoidance tendencies; in general ads, uncertainty avoidance tendencies were higher. The higher group showed higher dependent variable effects than the lower group. Therefore, the group with a low tendency to avoid uncertainty has a high level of dependent variable effects in the advertorial, and the group with high uncertainty avoidance tendency performs self-interpretation in general ads.

• 한국융합학회논문지
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• 제11권12호
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• pp.439-449
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• 2020

본 연구는 간호대학생들의 임종치료선호도에 영향을 미치는 요인을 확인하기 위해 수행되었다. 이 조사 연구는 2017년 12월부터 2018년 2월까지 수행되었으며, 최종 217명의 간호대학생의 자료가 수집되었다. '자율적 의사결정' 선호도에 영향을 미치는 요인은 교육수준(학년), 생명의료윤리 교육 수강, 죽음에 대한 태도, 연명치료에 대한 태도였다. '의료인의 의사결정'에 대한 선호도는 종교를 가지는 것과 관련이 있었다. '영성'에 대한 선호도에 영향을 미치는 요인은 교육수준(학년), 종교를 가짐, 전공만족도였다. '통증 조절'에 대한 선호도는 교육수준(학년), 사망한 환자 관찰경험, 나쁜 주관적 건강상태, 죽음에 대한 태도, 연명치료에 대한 태도와 관련이 있었다. 본 연구 결과는 간호학 전공 커리큘럼에서 연명치료, 생애말기간호 및 생애말기 의사결정에 관한 교육이 필수적임을 시사한다.

• Journal of Sport and Applied Science
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• 제5권2호
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• pp.39-46
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• 2021

Purpose: This study aims to analyze the management environment provincial and municipal professional soccer teams based on financial statements at a time when strengthening the financial soundness of domestic professional soccer teams is emphasized. Research design, data, and methodology: This study analyzed the financial statements (2018-2020) of the six teams of the provincial and municipal professional soccer teams whose financial statements were disclosed. The statements includes indicators of growth, profit and stability, which represents the main business performance of the entity. Results: As a result of the study, First, in terms of sales growth, sales in 2020 fell sharply year-on-year due to the impact of Covid-19. Second, the increase in sales through the import of player transfer fees had a positive impact on the growth of the business performance of the provincial and municipal professional soccer teams. Third, the profitability of the provincial and municipal professional soccer team is still low. Fourth, the debt ratio of the provincial and municipal professional soccer team was high, indicating that stability was serious. Conclusions: In order to increase sales, various strategies and measures are needed to overcome external factors such as media content products and non-face-to-face content strategies. The provincial and municipal professional soccer team, which has weak self-sustaining operations, needs to generate more profits through transferring players as a new management (profit) model, and first of all, a long-term strategy is needed to secure financial stability by improving the club's profitability.

• 한국경제지리학회지
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• 제24권4호
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• pp.446-462
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• 2021

본 논문은 브렉시트의 동인 중 하나로 여겨지는 영국의 오랜 지역 격차와 사회분열에 대해 살펴보고, 브렉시트 이후 변화된 영국의 지역발전정책 현황 등을 검토하는 데 그 목적을 둔다. 1970년대 후반 신자유주의적 세계화 속에 영국 정부의 공기업 민영화와 금융개혁 등과 같은 전략적 정책 선택이 지역 격차에 미치는 과정을 고찰함으로써, 현재 영국과 비슷한 수도권 과밀화, 지역 격차, 분권화 등의 문제를 안고 있는 우리에게 주는 정책적 시사점을 알아본다. 또한, 유럽연합 탈퇴 이후 영국의 자구적 지역발전기금, 지역발전정책, 그리고 거버넌스 변화 등을 살피고 주요 논쟁들에 대해 정리하였다. 마지막으로 본 연구는 지역 간 격차가 심화하는 한국 사회에 영국 사례가 주는 교훈을 바탕으로 사회적 합의를 통한 지역 격차 완화 정책의 당위성 제시와 수도권과 비교하여 비수도권 지역의 공정한 공간환경을 위한 정책 수립 필요성을 제시하였다.

• 한국융합학회논문지
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• 제13권5호
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• pp.531-539
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• 2022

정부는 COVID-19 확산을 방지하기 위해 사회적 거리두기 및 영업시간 제한 등의 정책을 시행하였고, COVID-19 장기 유행에 따라 소상공인들의 피해는 커지고 있다. 정부는 긴급재난지원금을 편성해 소상공인들의 경영압박을 해소하고자 하였다. 긴급재난지원금은 소상공인들에게 일시적인 도움이 되었지만, COVID-19 장기유행에 따라 경영 어려움은 커져갔다. 따라서 본 논문은 시스템 사고의 원형 중(Systme Archetype) 처방의 실패와 짐떠넘기기 원형을 활용하여 소상공인들의 회복력을 효과적으로 높일 수 있는 정책 지렛대로서의 정책 대안들을 탐색적으로 도출하고자 하였다. 소상공인들의 회복력을 높이기 위해 소상공인들의 긴급재정지원과 함께 소상공인들의 자생력을 높일 수 있는 지원이 필요하다.

• Asian Journal of Innovation and Policy
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• 제12권1호
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• pp.27-53
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• 2023

The purpose of this study is to examine the unique characteristics of the Korean academic system with regard to brain circulation, with a specific emphasis on the influence of overseas-trained academics on research activities within the Korean academic system. We have analyzed the statistical data on individual characteristics and performances of 48,499 Korean academics in science and engineering. We have examined the results at both the system and individual levels within the broader context of the macro characteristics of the Korean academic system. Our analysis reveals that the total number of domestically-trained academics exceeds the number of overseas-trained academics. However, in terms of research funding, overseas-trained academics tend to receive more funding than domestically-trained academics. Furthermore, after controlling other factors such as funding, personal attributes, and environmental factors, our analysis demonstrates that overseas training has a significant and favorable impact on the publication of internationally renowned journals. As such, the presence of overseas returnees has been essential for the effective functioning of the Korean academic system in the global research network and for conducting high-quality academic research. Therefore, the advantages of dependence on scientific core countries such as the US for overseas training have persisted. Nevertheless, upon scrutinizing the group of recently appointed 5,806 academics exclusively, we have discovered that junior academics who received their education domestically exhibit sufficient academic proficiency compared to their colleagues educated overseas. This observation highlights the potential for the Korean academic system to evolve into a self-sustaining system.

• 한국지진공학회논문집
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• 제27권5호
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• pp.203-211
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• 2023

For fast-built and safe precast concrete (PC) construction, the dry mechanical splicing method is a critical technique that enables a self-sustaining system (SSS) during construction with no temporary support and minimizes onsite jobs. However, due to limited experimental evidence, traditional wet splicing methods are still dominantly adopted in the domestic precast industry. For PC beam-column connections, the current design code requires achieving emulative connection performances and corresponding structural integrity to be comparable with typical reinforced concrete (RC) systems with monolithic connections. To this end, this study conducted the standard material tests on mechanical splices to check their satisfactory performance as the Type 2 mechanical splice specified in the ACI 318 code. Two PC beam-column connection specimens with dry mechanical splices and an RC control specimen as the special moment frame were subsequently fabricated and tested under lateral reversed cyclic loadings. Test results showed that the seismic performances of all the PC specimens were fully comparable to the RC specimen in terms of strength, stiffness, energy dissipation, drift capacity, and failure mode, and their hysteresis responses showed a mitigated pinching effect compared to the control RC specimen. The seismic performances of the PC and RC specimens were evaluated quantitatively based on the ACI 374 report, and it appeared that all the test specimens fully satisfied the seismic performance criteria as a code-compliant special moment frame system.