• The Safety technology
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• no.106
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• pp.64-67
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• 2006

• Journal of the Korean Society for information Management
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• v.9 no.1
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• pp.1-23
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• 1992

The purpose of this study is to answer a question as to "How much does CD-ROM improve thefunction of library\ulcorner" and, then, to build up an analytical framework to analyze the above question.The hypothesis is statistically tested with the responses of 282(70.5%) librarians in the libraries whichare currently using CD-ROM. The hypothesis is positively or vigorously supported by four steps.Therefore, the researcher suggests strongly at a plan to utilize CD-ROM be forwarded to improvelibrary functions. library functions.

• Applied Chemistry for Engineering
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• v.9 no.7
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• pp.1090-1097
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• 1998

Lidocaine compounds have widely been used as local anesthetics. Regarding the molecular mechanism for anesthesia by lidocaine, it is proposed that lidocaine molecules penetrate to the hydrophobic region of cell membrane and expand the membrane volume, producing a change in protein conformation that blocks sodium permeability or lidocaine molecules directly adsorb into lidocaine receptor in the protein channel without expanding the cell membrane. But these proposals have never been proven experimentally. In this study, the expansion of cell membrane by lidocaine compounds was investigated by employing lipid monolayer at the air/water interface as the mimetic system of cell membrane. It was found that oil-soluble lidocaine contracted the area/molecule of lipid in the monolayer of phosphatidyl choline, sphingomyelin, DS-PL95E and lipoid, but expanded the monolayer of phosphatidyl ethanolamine only in a certain range of mixing ratios. On the contrary, water-soluble lidocaine-HCl salt expanded the monolayers of all lipids used in this study.

• Journal of the Korea Institute of Construction Safety
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• v.2 no.1
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• pp.28-35
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• 2019

The average number of deaths in the construction industry reaches 500 per year, and in particular, it is confirmed that the type of accidents and deaths caused by disasters such as work platforms has occupied more than 60% of the total. In this study, we presented a structured and combined solution for technology, management, education, and cost that can solve systematically, politically, and external environmental factors as well as direct influence factors. In addition, we examined the safety and safety standards of domestic and international safety, and discussed implications. First, direct impact factors, organizational impact factors, policy influence factors, and external environmental impact factors were examined and classified into technical, education, and institutional dimensions. Second, in relation to the installation of the work scaffold, the standards (OSHA 1926.452), UK (The Work at Height Regulations 2005 No.735, BS5975), Japan (Labor Safety and Sanitation Regulations) and Germany (DIN 4420_4, DIN EN12810). In the case of domestic safety standards, similar to the foreign safety standards, safety measures such as materials and specifications are applied. However, details related to the installation, assembly and structure of the work platform are somewhat different from those in the United States and the United Kingdom excluding Japan. Using the results of this study, it is possible to understand the cause of the accident of foot pedestrian accident more systematically and comprehensively, and safety managers and researchers are expected to help in the accident investigation.

• Progress in Medical Physics
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• v.17 no.2
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• pp.96-104
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• 2006

Experiments from several groups Including ours have demonstrated that $Ca^{2+}$ can enhance the inactivation of N-type calcium channels. However, it is not clear if this effect can be ascribed to a 'classic' $Ca^{2+}$-dependent inactivation (CDI) mechanism. One method that has been used to demonstrate CDI of L-type calcium channels is to alter the intracellular and extracellular concentration of $Ca^{2+}$. In this paper we replaced the external divalent cation to monovalent ion ($MA^+$) to test CDI. In the previous paper, we could separate fast (${\tau}{\sim}150ms$) and slow (${\tau}{\sim}2,500ms$) components of inactivation in both $Ba^{2+}$ and $Ca^{2+}$ using 5-sec voltage step. Lowering the external divalent cation concentration to zero abolished fast inactivation with relatively little effect on slow inactivation. Slow inactivation ${\tau}$ correspond very well with provided the $MA^+$ data is shifted 10 mV hyperpolarized and slow inactivation ${\tau}$ decreases with depolarization voltage in both $MA^+\;and\;Ba^{2+}$, which consistent with a classical voltage dependent inactivation (VDI) mechanism. These results combined with those of our previous paper lead us to hypothesize that external divalent cations are required to produce fast N-channel inactivation and this divalent cation-dependent inactivation is a different mechanism from classic CDI or VDI.

• Proceeding of EDISON Challenge
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• 2017.03a
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• pp.358-364
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• 2017

많은 공사 현장에는 개구부, 작업발판, 가설계단의 통로 등에서의 추락사고를 방지하기 위해 설치하는 가시설물 중 안전난간이 있다. 안전난간은 작업장에서 현장인부들의 생명과 직결되므로 반드시 적절한 기준에 맞춰 설계를 하는 것이 필요하다. 이러한 안전난간은 표준안전난간으로서 추락재해방지 표준안전작업지침[1]에 의해 설계 기준이 명확하게 명시되어 있으며 난간대와 기둥각 부분 접합부는 쉽게 변형, 변위를 일으키지 않는 구조를 가져야 한다. 본 연구에서는 지침에 지시된 표준안전난간을 실제 설계기준에 맞게 직접 구조물을 모델링하고 EDISON용 구조해석 프로그램인 CASADsovler를 통해 유한 요소 해석을 수행하여 안전난간에 가해지는 응력 및 변위 결과들을 통해 구조의 안정성을 시험해 보았다. 더하여 다구찌 기법과 최적설계에 기반하여 안전난간 무게의 경량 최적화를 위한 연구를 진행하였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2007.05a
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• pp.1033-1037
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• 2007

하천의 수위를 유지하거나 농업용수를 취수할 목적으로 현재 국내에 약 18,000개 정도의 크고 작은 보가설치되어 있다. 이러한 보 중에는 극히 일부에 어도와 같은 생태통로가 인위적으로 설치되어 있지만 전체적으로는 매우 미미한 수준이다. 더욱이 도시 인구 집중황 따른 도심부의 확대로 인한 농경지의 도시화, 경작 방식의 변화에 의한 논농사 위주에서 비닐하우스 단지로의 변화와 같은 토지이용의 변화, 대형 저수지의 축조／양수장 설치 등에 따른 취수 시설물의 통합, 시설의 노후화 등으로 매년 50-150개 정도의보가 폐기되고 있다. 그러나 이렇게 폐기되는 보는 하천에 그대로 방치되어 하천생태통로의 단절, 수질악화, 수변 서식처악화 등의 문제를 지속적으로 야기시키고 있다. 연구지역은 경기도 고양시 곡릉천 곡릉2보로 선정하여 보 철거전 과 보 철거 후의 모니터링을 통한 수질분석을 시행하였다. 곡릉2보는 과거 취수용 보로 이용되었으나 주변지역 토지이용 변화로 용도를 상실한 보이다. 보 철거 전에는 보로 인한 보 상류 지역에 퇴적물이 쌓이면서 정체구역이 생기고 부유물질이 많아지면서 수질 악화를 초래하는 것으로 나타났다. 그러나 보 철거 후에는 화학적으로 상류 하류지점에서 SS 및 BOD의 농도가 감소하여 전체적으로 수질향상에 기여한 것으로 나타났다. 보 철거에 따른 수질분석에 대한 연구는 아직 진행 단계에 머물러 있으며, 그 주변에 대한 상세한 이론은 아직 미미하다. 따라서 현재 국내외 보의 현황 및 보 철거 기술을 조사하고, 우리나라의 조건이 다른 보를 선정하여 하천의 보가 수질에 미치는 영향을 정량적으로 분석함으로써, 향후 우리나라의 보 관리방안의 방향을 제시하는데 도움이 되고자 한다.를 제시하고 있다. 미국의 경우는 이러한 가이드라인을 실제로 현장에 적용하고 있으며 조성효과가 정성적으로 검증되었고 정량적인 관계 도출을 위한 연구가 지속적으로 진행되고 있다. 국내의 경우 수질개선 및 생태서식처 조성, 하천환경을 개선하기 위한 관련 정책이 꾸준히 제시되고 있다. 한 예로 정부에서는 수변구역을 지정 고시하여 상수원으로 유입되는 비점오염물질을 저감하고 생태서식처를 조성함으로써 양질의 상수원과 건전한 생태계를 확보하기 위한 제도를 시행 중이다. 수변 구역의 범위는 한강수변구역의 경우 약 $500{\sim}1,000m$로 설정되어 있으나 아직까지는 관리적 성격이 강하며, 향후에는 구체적인 조성방안이 요구된다. 본 연구에서는 한강 수변구역 내에 미국의 가이드라인에서 제시하는 수변완충지대의 물리적 조건과 국내 지역 토착식생을 적용하여 시험완충지대를 조성하였고, 실험조건 하에서 그 효과를 정량적으로 분석 검증한 결과와 외국사례를 분석하여 국내여건에 맞는 수변완충지대 조성 가이드라인(안)을 제시하였다.EX>$\ulcorner$세종실록$\lrcorner$(世宗實錄) $\ulcorner$지리지$\lrcorner$(地理志)와의 비교를 해보면 상 중 하품의 통합 9개소가 삭제되어 있고, $\ulcorner$동국여지승람$\lrcorner$(東國與地勝覽) 에서는 자기소와 도기소의 위치가 완전히 삭제되어 있다. 이러한 현상은 첫째, 15세기 중엽 경제적 태평과 함께 백자의 수요 생산이 증가하자 군신의 변별(辨別)과 사치를 이유로 강력하게 규제하여 백자의 확대와 발전에 걸

• Journal of Korean Society of Steel Construction
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• v.27 no.2
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• pp.155-167
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• 2015

If of application of the deep deckting floor in long span more than 6m, the deflection caused by the construction load occurred high. Because the constructing-works and safety by this deflection, take actually supports to laborers working on the deck. However, installed supports are having difficultly such as the restricted passage, deficiency of working space, and lowering of efficiency. And toward-opening deck is seen as local buckling of web plate, flexural-torsional buckling, and gradually opening of corrugated decking. In this study, we will suggest a deep decking floor system that reinforced with both ends cap plates for toward-opneing decking change from opening to closing. The constructing deflection of a deep decking more than 6m must be satified 30mm and L/180 as proposed. Full-scale field tests loading by sand conducted a deep decking reinforced with and without cap plate. In conclusion, the specimen reinforced with cap plates have shown that to ensure the negative moment $wl^2/18$. And constructing-deflection of deep decking shown that to satisfy the evaluation value (L/180 or 30mm).

• Journal of the Korea Convergence Society
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• v.9 no.12
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• pp.441-447
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• 2018

This study aimed to investigate the effect of firefighters' social capital on subjective happiness. This research was conducted from Jun 12 to Aug 25, 2017, and a descriptive analysis, t-test, hierarchical regression analysis was carried out based on the results of a survey with 351 firefighters in Gyeonggi-do to verify the research hypothesis. As a result, it was revealed that network(${\beta}=.315$, p<.001), trust(${\beta}=.293$, p<.01), cooperation(${\beta}=.225$, p<.01) and trust among other sub-variables of firefighters' social capital had significant effects on subjective happiness. Based on the results, this research suggested that various measures to strengthen social capital would be required in order to improve fire-fighters' happiness: efforts to increase trust within the organization, political support for vitalizing formal network as a communication channel among firefighters organizations, encouraging interest in the community and promoting informal network such as volunteer work, developing transparency in operating the organizational policy and system, etc.

• Advanced Industrial SCIence
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• v.3 no.3
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• pp.1-7
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• 2024

The purpose of this study is to investigate how supply chain digital transformation affects corporate performance by building supply chain agility and innovation capabilities based on the resource-based view (RBV) theory. The model was verified using structural equation modeling based on a data set of 271 domestic companies, and mediation and moderation analyzes were performed to test the research hypotheses. The study found a positive correlation between supply chain digital transformation and corporate performance that is fully mediated by both supply chain agility and innovation capability, with the potential for the interaction between supply chain agility and innovation capability to have adverse consequences for corporate performance. This study is expected to advance our understanding on the antecedents of corporate performance by integrating supply chain digital transformation and the mediating mechanisms of supply chain agility and innovation capabilities that serve as a conduit between supply chain digital transformation and RBV-based corporate performance.