• 한국재난정보학회 논문집
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• 제17권4호
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• pp.684-693
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• 2021

연구목적: 아두이노를 이용하여 실시간 대지저항 데이터를 취득할 수 있는 스마트 대지저항 측정장치를 개발하여 낙뢰 등 이상전압으로부터 안전한 설비환경을 구축하는것에 목적이 있다. 연구방법: 본 논문은 아두이노와 전력선 통신(PLC) 체계를 갖춘 대지저항 취득 및 분석 시스템을 개발하여 설계모델과 적용사례를 연구하였다. 경남지역의 풍력발전 단지 내 일부 부지를 테스트 베드로 선정하여 신기술을 적용한 실시간 대지저항 데이터를 취득하였다. 전극배열은 웨너(Wenner) 4전극배열과 슐렘버거(Schlumberger) 전극배열을 혼용한 스마트 전극배열을 채택하였다. 연구결과: 본 기술의 특징은 첫 번째로 스마트 다 전극의 깊이를 각기 다르게 편성해 층간에 특이성을 가지는 지층 구조에도 취득 데이터의 오차범위를 축소하였다. 두 번째로 스마트 접지전극에서 취득한 대지저항 데이터의 정보를 사물인터넷으로 실시간 송·수신이 가능하도록 IT융합 기술을 적용하였다. 마지막으로 규칙적인 관리 체계를 구축하고 Server에 축적된 빅 데이터를 분석하여 다양한 요소들의 변화추이를 확인할 수 있으며, IT융합 환경에 최적의 접지 알고리즘과 접지시스템 설계 모델링이 가능하다. 결론: 본 기술은 4차 산업 시대에 근간이 되는 도시 기반시설에 낙뢰로 인한 서지(Surge)의 피해를 줄이고 최적화된 접지시스템 모델을 설계하여 사용자의 안전과 생명을 보호 할 것이다. 또한 순수 국산 기술력의 지적재산권을 확보하여 포스트 코로나 시대에 팬데믹으로 정체되어있는 우리산업의 일자리 창출과 활기를 불어넣는 효과도 기대된다.

• 한국식품위생안전성학회지
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• 제36권6호
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• pp.520-527
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• 2021

본 연구에서는 보육시설 실내공기에서 분리된 식중독 균주의 독소 유전자 분포와 항생제 내성을 분석하여 보육시설 실내공기에 의한 식중독 발생을 사전 예방하고 식중독 발생 시 적절한 치료를 위한 기초자료를 제공하고자 하였다. 어린이집 실내공기에서 분리된 Staphylococcus aureus 16주, Bacillus cereus 37주를 실험대상으로 하였다. S. aureus와 B. cereus 독소 유전자는 PCR 방법으로 검출하였다. 항생제 감수성 실험은 Clinical and Laboratory Standard Institute의 디스크 확산법에 따라 실험하였다. S. aureus 16 균주 중 11 균주(68.6%)에서 seg와 sei 독소 유전자가 검출되었다. B. cereus 37 균주 모두에서 nheA와 nheB 독소 유전자가 검출되었다. B. cereus 독소 유전자 패턴은 총 12개로 나타났으며 nheA-nheB-nheC 독소 유전자가 가장 중요한 패턴으로 나타났다. S. aureus 16 균주의 항생제 감수성실험 결과 ampicillin과 penicillin 항생제에 93.8%, 87.5% 내성을 나타내었으나 methicillin resistance Staphylococcus aureus와 vacomycin resistance Staphylococcus aureus는 검출되지 않았다. B. cereus 37 균주의 항생제 감수성 실험 결과 ampicillin과 penicillin 항생제에 100% 내성을 나타냈었다. 이러한 결과를 종합하여 볼 때 보육시설 실내공기에 오염된 S. aureus와 B. cereus에 의한 식중독을 발생을 예방하기 위하여 주기적인 환기와 공기 질 관리가 필요한 것으로 판단되었다.

• 패션비즈니스
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• 제16권6호
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• pp.1-20
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• 2012

This study aims to define the influences of an individual's talent types and body consciousness factors on high((intense)-level appearance management behavior in 367 adults(female 172 and male 195). The present study is the first to consider both human talent type and the body consciousness on the high level-appearance management behavior correlates to appearance management behaviour. According to the result of the analysis, plastic surgery on body forms or faces are done by few people. However, straightening teeth, ear piercing, removal of spots or imperfections, and eyebrow tattoos are conducted by many consumers without much resistance. It is rather widely accepted, despite the fact that it can cause pain, discomfort, and side-effects. Furthermore, although excessive acts such as muscle training, dieting, weight managing, and oriental treatments can lead to side-effects, the standardized efficient beta value turned out to be high for these treatments. Thus, this study suggests that both the interpersonal talent among 8 talent factors and 2 body consciousness factors contributes to the reinforcement of the self-identity through high level-appearance management behaviors, but except risky plastic surgery. Therefore, this study supports the previous researches that body consciousness composed of self-source, which is desires and efforts to achieve the ideal body, and external-source, which is the internalization of other people's feedbacks.

• 대한안전경영과학회지
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• 제23권4호
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• pp.83-92
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• 2021

The construction of smart factories for government SMEs is not easy due to the lack of professional manpower. The use of retired professionals is a way to solve the problem to some extent and to solve the job problem of seniors by effectively utilizing social assets. This study examines the effectiveness of using Meister based on a survey of 195 companies participating in the Smart Meister Support Program. As a result, the better pre-participation readiness and the better management and coordination of change during the participation, the more significant influence was on Meister's ability development and corporate performance. In particular, it was confirmed that Meister's competence plays a role in both 'pre-participation readiness and business performance' and 'between change management during participation and business performance'. In order to improve the performance of the smart meister business in the future, it is necessary to proactively promote the purpose and purpose of the business targeting companies that wish to participate in the business. In addition, it was found that it is necessary to support the development of change management in order to minimize the resistance to innovation during the project. It will be possible to enhance social competitiveness by resolving senior jobs and strengthening the competitiveness of SMEs by discovering and utilizing Meister, who is an expert among retirees.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회B
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• pp.2432-2437
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• 2007

The demand of high speed and miniaturization of electronic devices results in increased power dissipation requirement for thermal management. In this work, the effects of microchannel width, height and liquid flowrate on the cooling performances of microchannel waterblock are investigated experimentally. The microchannel waterblock considered ranged in width from 0.5 to 0.9 mm, with the channel height being nominally 1.7 to 9 times the width in each case. The experiments were conducted using water, over a liquid flow rate ranging from 0.2 to 2.0 lpm. The base temperature, thermal resistance and pressure drop increase with increasing of liquid flow rate. The measured thermal resistances ranged from 0.10 to 0.23 $^{\circ}C$/W for the channel 5.

• 한국가구학회지
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• 제26권4호
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• pp.392-397
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• 2015

This study was carried out to analyze the effects on mechanical properties of deteriorated wood member by outdoor condition. The surface color, mechanical properties and structural stability of traditional wooden structures, exposed in water and UV, could be changeable. For the purpose, accelerated weathering test based on outdoor condition was carried out. The weathering time levels were composed 0, 500, 1000, 1,500 and 2,000 hours and mechanical properties were evaluated on each specimen according to weathering time level. Bending properties were decreased on weathering but recovered after 1,000 hours. Fatigue and impact strength were decreased to 1,000 hours and did not changed since then. Abrasion resistance was minimized in 1,000 hours. This results could be utilized for effectively stability management of traditional wooden structures and members.

• Biomolecules & Therapeutics
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• 제20권1호
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• pp.62-67
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• 2012

TNF-related apoptosis-inducing ligand (TRAIL) is a promising agent for management of cancer because of its selective cytotoxicity to cancer cells. However, some cancer cells have resistance to TRAIL. Accordingly, novel treatment strategies are required to overcome TRAIL resistance. Here, we examined the synergistic apoptotic effect of apigenin in combination with TRAIL in Huh-7 cells. We found that combined treatment of TRAIL and apigenin markedly inhibited Huh-7 cell growth compared to either agent alone by inducing apoptosis. Combined treatment with apigenin and TRAIL induced chromatin condensation and the cleavage of poly (ADP-ribose) polymerase (PARP). In addition, enhanced apoptosis by TRAIL/apigenin combination was quantified by annexin V/PI flow cytometry analysis. Western blot analysis suggested that apigenin sensitizes cells to TRAIL-induced apoptosis by activating both intrinsic and extrinsic apoptotic pathway-related caspases. The augmented apoptotic effect by TRAIL/apigenin combination was accompanied by triggering mitochondria-dependent signaling pathway, as indicated by Bax/Bcl-2 ratio up-regulation. Our results demonstrate that combination of TRAIL and apigenin facilitates apoptosis in Huh-7 cells.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2016년도 춘계 학술논문 발표대회
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• pp.149-150
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• 2016

The membrane structure is being applied in structures for various uses for its many advantages as permeableness, lightweightness, constructability, resource saving, and management cost reduction, and the usage is being expanded. However, despite the development of membrane structure, the standard for architectural membrane performance that considered fire safety is still inadequate. Therefore, this study applied basalt fiber with flame resistance on architectural membrane. Also, this study confirmed the membrane applicability of basalt fiber through comparison with existing architectural membrane.

• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part2
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• pp.767-768
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• 2006

In this study, copper vapor chambers with built-in cooling fins, which eliminated the soldered or brazed joints in the conventional vapor chamber, were fabricated using the metal injection molding process. The results show that with optimized molding parameters, fins with an aspect ratio up to 18 could be produced. After sintering, the densities of the fin and chamber reached 96%. With only 32 cooling fins and a small fan installed, the thermal resistance of the heat sink was $1.156^{\circ}C/W$, and the power dissipation was 40W when the junction temperature was $70^{\circ}C$. When copper powder was sintered onto the chamber to make a vapor chamber, the thermal resistance decreased to $1.046^{\circ}C/W$.

• Computers and Concrete
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• 제23권6호
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• pp.399-408
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• 2019

Structural health monitoring is important for the safety of lives and asset management. In this study, numerical models were developed for the piezoresistive behavior of smart concrete based on finite element (FE) method. Finite element models were calibrated with experimental data collected from compression test. The compression test was performed on smart concrete cube specimens with 75 mm dimensions. Smart concrete was made of cement CEM II 42.5 R, silica fume, fine and coarse crushed limestone aggregates, brass fibers and plasticizer. During the compression test, electrical resistance change and compressive strain measurements were conducted simultaneously. Smart concrete had a strong linear relationship between strain and electrical resistance change due to its piezoresistive function. The piezoresistivity of the smart concrete was modeled by FE method. Twenty-noded solid brick elements were used to model the smart concrete specimens in the finite element platform of Ansys. The numerical results were determined for strain induced resistivity change. The electrical resistivity of simulated smart concrete decreased with applied strain, as found in experimental investigation. The numerical findings are in good agreement with the experimental results.