• 대한안전경영과학회지
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• 제15권4호
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• pp.171-178
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• 2013

Workers are avoiding production/manufacturing sites due to the poor working environment and concern over safety. Small and medium-sized businesses introduce new equipment to secure safety in the production site or ensure effective process management by introducing the real-time monitoring technique for existing equipment. The importance of real-time monitoring of equipment and process in the production site can also be found in the ANSI/ISA-195 model. Note, however, that most production sites still use paper-based work slip as a process management technique. Data reliability may deteriorate because information on the present condition of the production site cannot be collected/analyzed properly due to manual data writing by the worker. This paper introduces the monitoring and process management technique based on a direct facility interface to secure safety in the field by improving the poor working environment and enhance there liability and real-time characteristics of the production data. Since the data is collected from equipment in real-time directly through the SIB-based interface and PLC-based interface, problems associated with workers' manual data input are expected to be solved; safety can also be improved by enhancing workers' attention to work by minimizing workers' injuries and disruption.

• 디지털융복합연구
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• 제13권8호
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• pp.369-374
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• 2015

본 연구에서는 초음파매개물의 1차적인 목적이외에 부가적인 특징을 조합하여 새로운 초음파매개물의 개발 가능성을 모색하였다. 임의 제조된 각 제형에 따른 유동학적 특징과 제조비용을 기성품 제제와 비교 분석하였다. 초음파전파매개물은 제형에 따라 각기 다른 기능적 특성을 지니게 되며, 저점도에멀전과 오일젤에서 유동성이 가장 우수하였다. 제조비용에서는 수화젤 제형이 물성분이 많을수록 제조비용이 가장 낮았으며, 에멀전과 오일젤 제형에서는 오일의 함유량이 높을수록 제조비용에 많은 차이가 있었다. 본 연구는 초음파의 다양한 영역의 전문성을 겸비한 새로운 초음파매개물의 연구에 대한 초석을 이룰 수 있을 것으로 사료된다.

• 한국재료학회지
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• 제19권11호
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• pp.613-618
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• 2009

We designed new compositions for lead free and low temperature sealing glass frit of $ZnO-V_2O_5-P_2O_5$ system, which can be used for PDP (Plasma Display Panel) or other electronic devices. The $ZnO-V_2O_5-P_2O_5$ system can be used as a sealing material at temperatures even lower than 430$^{\circ}C$. This system, however, showed lower bonding strength with glass substrate compared to commercialized Pb based sealing materials. So, we added $TiO_2$ as a promoter for bonding strength. We examined the effect of $TiO_2$ addition on sealing behaviors of $ZnO-V_2O_5-P_2O_5$ glasses with the data for flow button, wetting angle, temporary & permanent residual stress of glass substrate, EPMA analysis of interface between sealing materials and glass substrate, and bonding strength. As a result, sealing characteristics of $ZnO-V_2O_5-P_2O_5$ system glasses were improved with $TiO_2$ addition, but showed a maximum value at 5 mol% $TiO_2$ addition. The reason for improved bonding characteristics was considered to be the chemical interaction between glass substrate and sealing glass, and structural densification of sealing glass itself.

• Journal of Nutrition and Health
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• 제36권6호
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• pp.613-621
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• 2003

The purpose of this study was to investigate the association between dietary quality and the risk of coronary heart disease (CBD) among Korean men by a case-control study. Methods: The cases were 108 male patients with a first acute myocardial infarction or a new diagnosis of angina pectoris who were admitted to a university teaching hospital in Seoul. Controls were 142 age-matched patients admitted to the departments of ophthalmology and orthopedic surgery at the same hospital. Dietary information was assessed by a nutritionist using a semiquantitative food frequency questionnaire (FFQ), and dietary quality index (DQI) scores were calculated. Results: The intakes of total fat and cholesterol and body mass index (BMI) in cases were significantly higher than those in controls. The mean DQI scores were 8.6 for the cases and 9.4 for the controls. A higher DQI, which was indicative of a better quality diet, was inversely associated with the risk of CHD when comparing the highest to lowest quatiles, but borderline significant (odd ratios 0.60, 95% confidence interval 0.25-1.39, P for trend ＝ 0.05). Conclusions: Our findings suggest that better dietary quality may reduce the risk of CHD among Korean men.

• 전력전자학회논문지
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• 제11권1호
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• pp.29-37
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• 2006

본 논문에서는 LM-FNN(learning Mechanism-Fuzzy Neural Network) 제어기를 이용하여 IPMSM 드라이브의 고성능 속도를 제어한다. 고성능제어를 위하여 신경회로망과 퍼지제어를 혼합 적용한 FNN을 설계한고 더욱 성능을 개선하기 위하여 학습 메카니즘을 이용하여 FNN 제어기의 파라미터를 갱신시킨다. 그리고 ANN(Artificial Neural Network)을 이용하여 IPMSM 드라이브의 속도 추정기법을 제시한다. 추정속도의 타당성을 입증하기 위하여 시스템을 구성하여 제어특성을 분석한다. 그리고 추정된 속도를 지령속도와 비교하여 전류제어와 공간벡터 PWM을 통하여 IPMSM의 속도를 제어한다. 본 연구에서 제시한 LM-FNN과 ANN 제어기의 제어특성과 추정성능을 분석하고 그 결과를 제시한다.

• Toxicological Research
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• 제28권2호
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• pp.129-137
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• 2012

Probabilistic ecological risk assessment (PERA) for deriving ecological protective concentration (EPC) was previously suggested in USA, Australia, New Zealand, Canada, and Netherland. This study suggested the EPC of cadmium (Cd) based on the PERA to be suitable to Korean aquatic ecosystem. First, we collected reliable ecotoxicity data from reliable data without restriction and reliable data with restrictions. Next, we sorted the ecotoxicity data based on the site-specific locations, exposure duration, and water hardness. To correct toxicity by the water hardness, EU's hardness corrected algorithm was used with slope factor 0.89 and a benchmark of water hardness 100. EPC was calculated according to statistical extrapolation method (SEM), statistical extrapolation $method_{Acute\;to\;chronic\;ratio}$ ($SEM_{ACR}$), and assessment factor method (AFM). As a result, aquatic toxicity data of Cd were collected from 43 acute toxicity data (4 Actinopterygill, 29 Branchiopoda, 1 Polychaeta, 2 Bryozoa, 6 Chlorophyceae, 1 Chanophyceae) and 40 chronic toxicity data (2 Actinopterygill, 23 Branchiopoda, 9 Chlorophyceae, 6 Macrophytes). Because toxicity data of Cd belongs to 4 classes in taxonomical classification, acute and chronic EPC (11.07 ${\mu}g/l$ and 0.034 ${\mu}g/l$, respectively) was calculated according to SEM technique. These values were included in the range of international EPCs. This study would be useful to establish the ecological standard for the protection of aquatic ecosystem in Korea.

• 셀메드
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• 제4권2호
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• pp.12.1-12.12
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• 2014

Epinephrine is a critical drug for patients at risk for anaphylaxis. Here, we suggest moxibustion as an alternative method to reduce anaphylaxis. Moxibustion was applied to the Shimen (CV5) acupoint and found to attenuate compound 48/80-induced mortality. Capsazepine, a transient receptor potential vanilloid (TRPV) 1 antagonist, significantly improved overall survival rates compared to groups treated with moxibustion or 2-aminoethoxydiphenyl borate (an activator of TRPV1, 2, and 3). Probenecid (a TRPV2 agonist) also increased survival rate and reduced histamine levels. Survival rates increased by moxibustion and probenecid were completely inhibited by ruthenium red (a TRPV2 and 3 antagonist) and gadolinium chloride (general TRPV antagonist), respectively. Passive cutaneous anaphylaxis and ear swelling were significantly reduced by moxibustion and probenecid (p < 0.05). In cardiomyocytes, TRPV2 was over-expressed by compound 48/80 and histamine but this increased TRPV2 expression decreased to baseline with moxibustion and probenecid treatment. In addition, intracellular calcium levels increased by compound 48/80 were reduced by probenecid. Overall, these findings suggest that the reduction of anaphylaxis caused by moxibustion could represent a new mechanism of moxibustion related to the regulation of TRPV2 activation and promotion of epinephrine secretion.

• 대한가정학회지
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• 제44권5호
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• pp.35-48
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• 2006

The purpose of the study is to examine how housing consciousness has been changed through various discourse on ideal housing from opening ports to the present. Reviews of literature including newspapers, magazines, novels, advertising materials, research papers, books, and so on are mainly utilized in accomplishing the purpose. This study covers four periods such as the enlightenment era, the Japanese colonial nile, before and after the Korean war, and after the economic development to present. During the enlightenment period in which foreign culture and housing were introduced, with reconsideration on traditional housing basic physiological housing value including health and hygiene was appeared. The desires of Munhwa housing with western styles and housing improvement were emphasized due to the new cultural improvement during the Japanese colonial rule. Before and after the Korean war which was chaotic times with rehabilitation, the provision of a large amount of public housing with minimum conditions for the basic human needs was the most important. After 1960s, due to the housing policy focusing on the mass-provision of apartments and the discourse on apartment as an ideal housing for the ordinary households in Korea, apartment dwellings become structure type norms in Korea.

• 한국컴퓨터정보학회논문지
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• 제16권12호
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• pp.157-165
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• 2011

정보 과목에서 컴퓨터 과학의 원리와 이해를 증진시킬 수 있는 내용과 문제해결 방법과 절차에 대한 내용, 정보 윤리에 대한 내용이 강화되었으나 2007 개정 교육과정의 컴퓨터 과학의 원리와 이해, 문제 해결 방법과 절차에 대한 내용들은 7차 교육과정의 활용, 소양 위주 내용에 비해 쉽지 않은 내용이며 학습자에게 어려운 과목으로 인식됨에 따라, 학습자가 쉽게 접근가능하고 적극적인 참여를 유도할 수 있으며 학습자의 흥미를 유발하여 학업성취도를 높일 수 있는 교육 자료가 요구된다. 본 연구에서는 중학교 정보 표현에 관한 내용을 컴퓨터를 사용하지 않는 놀이활동 교육 자료로 개발하고 중학교 2학년들을 대상으로 4차시 수업을 진행한 후 학업성취도에 미치는 영향을 검증하였다. 그 결과, 놀이 활동 교육 자료를 활용한 수업이 강의식 수업에 비해 학업 성취도 면에서 유의미한 차이를 보였다. 이는 놀이 활동 교육 자료를 활용한 수업이 학업 성취도에 긍정적인 영향을 준 것으로 볼 수 있다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 춘계학술대회논문집B
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• pp.644-649
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• 2000

A new cyclone system for the vacuum cleaner to collect dusts has been studied experimentally and numerically to meet the constant suction power, hygienic exhaust and a reduction of maintenance cost. The cyclone system of the vacuum cleaner consists of twin cyclones for improving dust collection efficiency. The first. cyclone catches large dust particles and the second one having two separated flows to decrease pressure drop collects small dust particles. The optimal design factors such as dust collection efficiency, pressure drop, and cut-size are investigated from the experimental results by the Taguchi method. Cyclone cleaner systems designed in this study has a good Performance taking into account the dust collection efficiency of 93% and the cut-size of $1.6{\mu}m$ in mass median diameter at the flow rate of 1 CMM. The cyclone vacuum cleaner showed the potential to be an effective method to collect dusts generated in the household.