• 융합정보논문지
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• 제9권10호
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• pp.87-93
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• 2019

치유 물질인 아마인유에 형광 물질을 소량 혼합한 혼합물을 코어 성분으로 하여 마이크로캡슐을 제조하였다. 이 마이크로캡슐을 코팅재 조성물에 균일하게 분산시켜 모르타르 표면에 도포함으로써 지기치유 보호코팅재를 제작하였다. 이 코팅재에 약 $100{\mu}m$ 폭의 스크래치 또는 균열 손상을 발생시킨 후 자외선을 조사하면서 관찰한 결과, 캡슐 함량이 증가할수록 형광 발광의 범위가 증가하였고, 20wt% 이상의 캡슐을 함유한 코팅재에서는 손상 부위가 치유물질로 거의 채워진 모습을 나타내었다. 물흡수도 시험 결과 20wt% 이상의 캡슐을 함유한 코팅재는 약 85%의 치유효율을 보였다. 손상 부위에서 나타나는 형광은 3m의 거리에서도 용이하게 식별되었다. 본 연구결과는 콘크리트 보호를 위한 마이크로캡슐형 자기치유 코팅재의 치유기능을 육안으로 용이하게 확인하는데 도움을 줄 것으로 기대된다.

• 대한토목학회논문집
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• 제42권5호
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• pp.671-679
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• 2022

국내 탄약 시험장과 군의 포탄 사격 훈련장은 잦은 사격과 폭발 실험으로 인해 충격파와 파편 등의 유해인자가 발생한다. 이에 따라 지역 주민의 민원이 급증하고 있으며 근접한 시설물과 인명피해의 위험이 크다. 최근 건설된 탄약 시험장은 부지확보 제한에 따라 반경 300 m 이내의 좁은 지역에서 화포 사격 및 로켓 추진기관 연소시험 시설을 구축하였으나 적절한 방호구조물이 없어 시설물 피해가 누적되고 있다. 따라서 본 연구에서는 화포 사격 및 로켓추진기관 실험 간 발생하는 소음, 진동, 충격파, 열 효과 등 유해인자에 대한 정량적 데이터를 측정하고 폭발 압력 특성을 분석하여 탄약 시험장의 강재 방호구조물 적용 연구를 수행하였다.

• 한국항공우주학회지
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• 제45권1호
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• pp.46-53
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• 2017

본 논문에서는 회전익 항공기의 조종입력과 지상 활주 속도를 바탕으로 해석을 통하여 전선절단기 길이를 제시하였다. 항공기의 안전을 위해서 적용되는 전선절단기가 적절한 길이로 선정되지 않을 경우 블레이드와 충돌가능성 생기거나 전선에 의해서 사고가 발생할 수 있다. 본 연구를 위해서 개발에서 사용된 조종입력을 분석하여 지상 활주에 필요한 조종입력 조건을 설정하였다. 이를 바탕으로 20, 40, 60 kts 지상 활주 속도별로 해석을 통하여 블레이드와 전선절단기 충돌 가능성을 검토하였다. 이 후, 이 결과를 항공기 모사시험 결과와 비교하여 해석결과의 적절성을 확인하였다. 최종적으로 지상 활주 간 모든 조종입력 범위에 대해 충돌을 피하기 위한 전선절단기 축소 길이와 이 경우 공중비행 시 생기는 비보호구역의 증가량을 동시에 제시하였다.

• 한국의류산업학회지
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• 제16권6호
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• pp.945-953
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• 2014

This study aims to develop protective pants to relieve impact from falls and to present basic data for the development. The survey results are as follows; First, 45% of the respondents were in their 60s and 55% of them were in their over 70s and older. Also, 64% of them have fallen once for the past year and 36% of them have fallen twice or more. The older they were, the more there were those who have fallen twice or more. This indicated the older people has experienced more fall accidents again after a initial fall accident. Second, as per accident situations, the survey showed that fall accidents happened the most in the winter and in the afternoon (12-18 pm). Also, it happened on a street mostly and they were wearing sneakers or hiking boots when they got a hurt slipped in a front or side by missing their step in a walk. The injury areas are mostly knee and ankle. They had the bruises or a sprain in their knee and ankle mostly. The rate of bone fracture was 19.5%. Therefore, the protection area to falls in lower body is the knee. But hip and hip joint should be protected with knee as well because those are usually be broken when it is damaged. Third, approximately 80% of those who were hospitalized for treatment had surgery. Patients who had surgery were rather in their over 70s than in their 60s. The older they were, the more serious their fracture was. The period of hospital or outpatient treatment is more than three weeks in many cases. They responded their health got worse after falls. Aftereffects of accidents were physical discomfort, anxiety and medical costs. Falls to the old makes physical damage, psychological damage, which cause reduced physical activity and the increased cost of health care with economic losses. So it results on a negative impact on the life of the old. Fourth, elderly females were rarely aware of impact protective clothing and they have never purchased such clothing. For impact protective pants, the major consideration was suitable design for their body types. They liked casual style with front or side pockets and simple designs without any patterns or decorations. As per pants materials, they responded that they need functionality, activity and elasticity. Among the functional points, insulation of cloths are considered importantly, so the heat reservance of material in the impact protective pants should be considered carefully.

• 대한본초학회지
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• 제23권3호
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• pp.1-9
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• 2008

Objectives : This research was performed to investigate protective effect of Sophora Subprostrata against transient global ischemic damage after 5-min two vessel occlusion. Methods : Gerbils were divided into three groups: Normal group, 5-min two vessel occlusion (2VO) group, Sophora Subprostrata administrated group after 2VO. The CCAs were occluded by microclip for 5min. Sophora Subprostrata was administrated orally(12mg/ml) for 7 days after 2VO. The histological and immunohistochemistrical analysis was performed at 72 hours and 7 days after the surgery each. For histological analysis, the brain tissue was stained with 1% cresyl violet solution and Immunohistochemistry for BAX and Bcl-2 was carried out to examine effect of Sophora Subprostrata on ischemic brain tissue. Results : The results showed that (1) Sophora Subprostrata has the protective effect against ischemia in CA1 area of the gerbil hippocampus 7 days after 5-minute occlusion, (2) the treatment of Sophora Subprostrata inhibits the expression of Bax relatively after 2VO-induced ischemia. That protective effect of the Sophora Subprostrata seems to be performed by regulating the proportion of Bax and Bcl-2 protein, (3) in hypoxia/reperfusion model using PC12 cell, the Sophora Subprostrata extract has the protective effect against ischemia in the dose of $2{\mu}/m{\ell}$ and $20{\mu}/m{\ell}$.This study suggests that Sophora Subprostrata has neuroprotective effect against neuronal damage following cerebral ischemia in vivo with a widely used experimental model of cerebral ischemia in Mongolian gerbils and that Sophora Subprostrata regulates the proportion of Bax and Bcl-2 protein following ischemia. And, Sophora Subprostrata extract has protective effects also on a hypoxia/reperfusion cell culture model using PC12 cell. Conclusions : Sophora Subprostrata has protective effects against ischemic brain damage at the early stage of ischemia.

• 기술사
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• 제34권2호
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• pp.46-51
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• 2001

It Is not uncommon to see some reports that livestock wastes are discharged into land, streams or seas without any treatment in the protective area of water resource. This study reports the development of the technique of protecting water resources through making use of treated livestock in organic farming after the procedures of collecting livestock wastes in 100% water tight PDF tanks, mixing Pedac, etc and fermenting. This techinque makes organic farming products possible without experiencing soil acidification caused by chemical fertilizer.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
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• pp.1491-1494
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• 2006

We report a method for reducing the address discharge delay. The address discharge delay was reduced when the MgO protective layer was made on the dielectric area which was made rough intentionally. The delay reduction was more pronounced in the formative delay.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2017년도 춘계 종합학술대회 논문집
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• pp.111-112
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• 2017

MRI는 부분 영역을 자세히 영상화하는 검사임에도 인체에 위해한 RF를 전신에 주고 있다. 이러한 문제점을 개선하기 위해 저자들은 RF차단 방호복을 자제제작하여 적용한 결과 적용 전보다 적용 후가 95% 이상 RF를 차단하였다. 따라서 MRI 검사 시 본 연구의 방호복이 인체의 위해를 줄일 수 있는 최적의 대안임을 알 수 있다.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1996년도 International Conference on Agricultural Machinery Engineering Proceedings
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• pp.413-422
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• 1996

" Row -Zone Tillage" systems apply tillage procedures only to narrow strips of land where the next crop rows will be planted. The tilled zones are no more than 25% of the field area. Row-zone tillage procedures of crop production are conservative, where in the soil remains partially covered with protective residues while crops are planted , fertilized , grown , and harvested in the row-zones. Specially adapted implements are being developed for these operations. There is potential for minimizing farm machinery inventories. Limited crop response data are available from Canada and the USA.d the USA.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.7-8
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• 2007

This paper presents an vulnerability index for hidden failure of protective relays in transmission system. The bad influence can be quantized by an vulnerability index. When there is mis-operation, no-operation or mis-setting, power flow can be quantized by an index. According to the index, relays can be resetting. So the wide area blackout can be prevented.