• Journal of Convergence for Information Technology
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• v.11 no.3
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• pp.87-94
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• 2021

This study was conducted to identify the mental health and quality of life of cardiovascular disease patients by their activities restriction through the second analysis of the 7th KNHANES collected from 2016 to 2018. The subjects of this study were 521 adults with angina or myocardial infarction who had no missing variables among 24,269 subjects. The difference between mental health and quality of life according to the activity restriction was analyzed by Chi-square method and the effect of mental health and quality of life by activity restriction by Logistic regression method using the SAS 9.4 version. The results of the analysis showed that the stress level, the depression for the last two weeks and suicide thought level was high when there was activity restriction, which had a significant effect on mental health. Mobility, selfcare and usual activities were disrupted, and pain/inconvenience and anxiety/depression increased when there was activity restriction, which also showed a significant effect on quality of life. Therefore, it is suggested that the development and operation of effective physical activity promotion program to minimize activity restriction is necessary to improve mental health and quality of life of cardiovascular patients.

• Journal of the Korea Institute of Building Construction
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• v.22 no.2
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• pp.125-136
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• 2022

This research is to reduce the formwork leakage of high-fluidity concrete caused by insufficient accuracy of formwork fabrication widely used for high-fluidity concrete to general strength concrete. However, in the actual construction site, because of the insufficient accuracy of formwork fabrication may cause leaking concrete of mortar through a gab of the formwork. Therefore, in this research, which builds on previous research into providing thixotropy with PVA and Borax, the use of thixotropy to reduce high-fluidity mortar leakage was evaluated. The results of the experiment proved that the use of thixotropy with PVA and Borax can contribute to reduction of the formwork leakage of high-fluidity mortar. This finding is expected to lead to further research on reducing leakage of high-fluidity concrete.

• Journal of Industrial Convergence
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• v.21 no.5
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• pp.31-41
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• 2023

We examine the relationship between abusive supervision and work-family conflict, and the moderating effects of employee's resilience and perceived organizational support. We collected the employees' sample(n=136) and conducted multiple hierarchical regression analysis. Abusive supervision has a significant positive effect on work-family conflict. Subordinate's resilience has a buffer effect on the main relationship, but perceived organizational support has no significant moderating effect. This study will be helpful for employees who are suffered from work-family conflict.

• Proceedings of the Korea Water Resources Association Conference
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• 2020.06a
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• pp.294-294
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• 2020

연안표사는 해안의 정선이 후퇴해 침식이 심각해지는 한편, 항만·어항에서는 토사가 퇴적되어 선박이나 어선의 항로나 정박지 매몰로 선박의 항행 및 어업 활동에 지장을 초래하며 하천 하구부에서는 하구 폐쇄로 치수상의 문제점 등이 발생한다. 항만과 어항 관리자는 항로나 정박지의 매몰 대책에 대한 검토와 해안 관리자는 해안 보전 대책에 초점을 맞춰 제각기 목적을 위한 대책 검토를 수행하고 있다. 이처럼 매년 적지 않은 비용이 소요됨에도 불구하고 뚜렷하고 효과적인 대책 없이 연안에 인위적인 변화를 발생시켜 어디에선 모래가 퇴적되고 그 영향에 따라 또 다른 곳에서는 침식되는 악순환이 반복되고 있다. 연안침식 방지를 위한 대책을 구축하기 위해서는 어느 한 곳에 중점적인 대책이 아닌 표사계 전체의 관점에서 상호 간의 간섭 효과를 고려한 통합적인 관점으로부터 대책을 강구해야 할 것이다. 연안지역에서의 표사수지는 산지, 댐, 하천, 해안 등 각각의 영역으로부터 유입 및 유출에 따라 안정된 해안이 조성된다. 하지만 환경적 및 인위적 변화에 따라 안정된 표사수지는 파괴되며 이 영향에 따라 표사의 이동이 발생한다. 지금까지의 토사관리는 각각의 영역에서 재해저감 및 토사관리를 위한 여러 대책의 효과가 나타나고 있으나 통합적인 토사관리에 있어 상호간의 피드백이 단절되어 연안역에서 발생하는 침식에 대한 정확한 원인 규명에 많은 어려움과 문제점이 발생하고 있다. 이처럼 통합적인 연안침식 관리를 위해서는 연안역으로 유입되는 토사의 이동 메커니즘 규명이 매우 중요하며 이를 바탕으로 정확한 유사량 산정을 통해 적절한 대책을 마련할 수 있다. 또한, 지역적 특징이 강한 우리나라에서는 통합적인 연안관리를 위한 구체적인 방안 검토가 이루어지고 있지 않지만, 일본에서는 지속적인 관측과 모니터링 조사를 통해 체계적인 관리를 수행하고 있다. 따라서 본 연구에서는 일본에서 진행 중인 통합적인 토사관리 가이드라인에 따른 토사관리의 구체적인 방법과 그에 따른 정선변화 및 표수사지 체계를 산정하였다.

• Journal of Digestive Cancer Research
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• v.3 no.2
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• pp.105-107
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• 2015

Pancreatic cancer is commonly presented with distant metastasis. However metastasis to central nervous system (CNS) of pancreatic cancer was rarely reported. 79-years-old man was hospitalized with sudden onset right arm dysesthesia and weakness. In brain magnetic resonance imaging, multifocal high signal intensity lesions in cerebral and cerebellar cortices were observed. Leptomeningeal and parenchymal enhanced lesions were also noted in contrast-enhanced T1 images suggesting a metastasis from the pancreatic cancer. Stroke like manifestation of CNS metastasis of pancreatic cancer is extremely rare. Careful history taking and evaluation should be performed to find the origin of the sudden neurologic deficit.

• Journal of Navigation and Port Research
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• v.29 no.6 s.102
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• pp.481-485
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• 2005

The port entry system of the inner harbor in Pyeongtaek${\cdot}$Dangjin was planned as lock-gate in 'Master plan project on port planning in Asan industry base(1990)‘, but was changed to tidal harbor in 'Project maintaining Master plan for comprehensive development of Pyeongtaek${\cdot}$Dangjin port(2001)'. Accordingly, southern sea bank constructed under the lower part of Seohae-bridge will be removed so that inbound/outbound vessels for the inner harbor can navigate at all times. However, in the view of the safety on passing through the lower of Seohae-bridge, navigating conditions for the inner harbor will be restricted in the single-way of 50,000 DWT vessel and the two-way of vessel less than 30,000 DWT Therefore, this study carried out the estimation of traffic congestion arising from these vessels with above restrictions q[ter supposing annual inbound/outbound vessel's numbers for loading and unloading cargo surveyed on the inner harbor.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.24 no.5
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• pp.521-530
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• 2011

Since aircraft fuel tanks have many interfaces connected to the airframe as well as the fuel system, they have been considered as one of the system-dependent critical components. Crashworthy fuel tanks have been widely implemented to rotorcraft and rendered a great contribution for improving the survivability of crews and passengers. Since the embryonic stage of military rotorcraft history began, the US army has developed and practised a detailed military specification documenting the unique crashworthiness requirements for rotorcraft fuel tanks to prevent most, hopefully all, fatality due to post-crash fire. The mandatory crash impact test required by the relevant specification, MIL-DTL-27422D, has been recognized as a non-trivial mission and caused inevitable delay of a number of noticeable rotorcraft development programs such as that of V-22. The crash impact test itself takes a long-term preparation efforts together with costly fuel tank specimens. Thus a series of numerical simulations of the crash impact test with digital mock-ups is necessary even at the early design stage to minimize the possibility of trial-and-error with full-scale fuel tanks. In the present study the crash impact simulation of a few fuel tank configurations is conducted with the commercial package, Autodyn, and the resulting equivalent stresses and internal pressures are evaluated in detail to suggest a design improvement for the fuel tank configuration.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.26 no.5
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• pp.343-349
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• 2013

Crashworthy fuel cells have a great influence on improving the survivability of crews. Since 1960's, the US army has developed a detailed military specification, MIL-DTL-27422, defining the performance requirements for rotorcraft fuel cells. In the qualification tests required by MIL-DTL-27422, the crash impact test should be conducted to verify the crashworthiness of fuel cell. Success of the crash impact test means the improvement of survivability of crews by preventing post-crash fire. But, there is a big risk of failure due to huge external load in the crash impact test. Because the crash impact test itself takes a long-term preparation efforts together with costly fuel cell specimens, the failure of crash impact test can result in serious delay of a entire rotorcraft development. Thus, the numerical simulations of the crash impact test has been required at the early design stage to minimize the possibility of trial-and-error with full-scale fuel cells. Present study performs the numerical simulation using SPH(smoothed particle hydro-dynamic) method supported by a crash simulation software, LS-DYNA. Test condition of MIL-DTL-27422 is reflected on analysis and material data is acquired by specimen test of fuel cell material. As a result, the resulting equivalent stresses of fuel cell itself are calculated and vulnerable areas are also evaluated.

• Korean Journal of Poultry Science
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• v.30 no.3
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• pp.169-175
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• 2003

This experiment was conducted to study the optimum energy feeding regimens fur broiler breeders peaked in winter season with 400 caged hens of Ross strain. Four energy supply regimens which were different in daily energy allotment during laying period were employed for 40 weeks from 24 to 64 weeks of age. All experimental diets were formulated to contain 2,750 kcal ME/kg with adjustments made in total feed allotment to provide the desired energy levels. Total consumption of the feed would provide 20 g of protein, 4 g of calcium and 0.35 g of available phosphorus. There were no difference in hen-day egg production and average egg weight among the regimens of energy supply. Feed, ME and feed cost required per egg or per kg egg were significantly increased as the level of energy allotment increased(p<0.05). It was concluded that the energy supply regimen, which supplied 280 kcal ME per day at the age of 24 weeks and then increased the energy supply up to 400 kcal ME per day at the peak period of 30∼34 weeks of age, was superior in feed, ME and feed cost required per egg or per kg egg without any adverse effect on eg production and egg weight.

• The Korean Journal of Zoology
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• v.29 no.3
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• pp.215-233
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• 1986

The effect of tryptophan on brain formation at the early stage of chick embryo has been investigated morphologically using electron microscope. The electron micrographs of cerebral cortex cells of $5\\sim10$ day old chick embryo, which received 1.0mg of tryptophan showed that the irregularity, evagination and disruption of nuclear membrane and nuclear chromatin condensation, nucleolar chromatin margination and segragation. Hypertrophy of stalks, vesicles, and vacuoles can be seen and dilation and vesiculation of rough endoplamic reticulum and polysome disaggregation occured. Protein and RNA levels and the activity of several enzymes such as lactate dehydrogenase, succinate dehydrogenase, malate dehydrogenase and glucose 6-phosphate dehydrogenase of tryptophan administered group were significantly lower than those of control group suggesting that the tryptophan administration depressed protein biosynthesis resulting in the decrease of enzyme activity. It was found that serotonin content of egg yolk which has been incubated for 10 days were as much as three times that of control egg yolk. It is not clear whether the increase of serotonin content might inhibit intracellular yolk granule degradation which might result in malformation of chick embryo, but it is likely that tryptophan administration might depress protein biosynthesis, consequently, the enzyme biosynthesis would be impaired. This might give rise to improper development of chick embryo.