• 수산해양기술연구
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• 제46권2호
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• pp.115-125
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• 2010

In order to design the optimal escape vent for the coon strip shrimp pot, the tank experiments were conducted with the model pot of five different slit height and slit width, respectively. The optimal height and width of escape vent were determined to 20mm and 40mm by tank experiments, respectively. These were determined by the 50% selection carapace length which was denoted to 25mm in selectivity curve. The escape experiments were conducted to determine a number of escape vent with the original shrimp pot to be set the designed escape vent from 2 vents to 10 vents increasing at intervals of 2 vents in tank. The optimal number of escape vents denoted 8 vents. Therefore, to apply the escape vent in commercial shrimp pot will be efficient to reduce small size shrimps to catch.

• 수산해양기술연구
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• 제58권3호
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• pp.193-198
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• 2022

In this study, for the purpose of reducing the catch of small giant octopus in a net pot, an escape experiment of octopus was performed on five types of escape rings of different sizes. As a result of the experiment, the smallest giant octopus with a weight of 406 g was found to escape from an escape ring with a diameter of 30 mm or larger, and 592 g octopus, a weight similar to the octopus of the current minimum landing weight (600 g), escaped from an escape ring with a diameter of larger than 40 mm. An individual weight with 406 g becomes 39 mm when converted from a diameter of 25 mm circular escape vent; that is, the circumference to the inner diameter of the mesh. It can be inferred that the converted mesh size of 39 mm cannot escape. Logistic regression analysis was performed using a generalized linear model (GLM) to investigate the correlation between the ratio of escape ring size/Mantle diameter (R/MD) and the escape rate. As a result, it was found that there was a significant correlation between the R/MD ratio and the escape rate and that the higher the R/MD ratio, the greater the escape rate. As a result of logistic regression analysis, the R/MD value was denoted 0.520 with the 50% escape rate. In addition, it can be estimated to be about 50 mm when converted to the mesh size. Therefore, in this study, the diameter of the escape ring and the size of the escape possible of the octopus were experimentally considered. It was found that there was a significant correlation.

• Journal of Multimedia Information System
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• 제7권2호
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• pp.147-156
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• 2020

The author Nakajima was involved in the field of disaster communications and emergency medical care as guest research scientist at the Fukushima Nuclear Accident Independent Investigation Commission established by the National Diet of Japan and reviewer of the Commission's report, and Kurokawa was the chairman of this Commission. Looking back over a decade, we are on the liability issue of bureaucrats and telecom operators, so it's becoming clear what was hidden at the time. The battery of NTT DoCoMo's mobile phone repeaters had a capacity of only about 24 hours, and communication failures increased after one day. The Government also failed to issue an announcement of "Vent from reactor" under the Telecommunications Act Article No. 129. This mistake lost the opportunity to use the third-party telecommunications (e.g. taxi radios). Furthermore, as a result of LASCOM (telecommunications satellite network for local governments via GEO) and a variety of unexpected communication failures, the evacuation order "Escape!" could not be notified to the general public well. As a result, the general public was exposed to unnecessary radiation exposure. Such bureaucratic slow action in emergencies is common in the response to the 2020 coronavirus.

• 한국재난정보학회 논문집
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• 제13권2호
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• pp.233-248
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• 2017

초고층 건축물의 발생 가능한 화재를 방지하기 위해서는 통일된 법 규정과 합리적인 설계가 필요하다. 이를 위해 본 연구는 초고층 및 대형 건축물관련 건축심의 성능위주설계(PBD)평가 재해영향평가(DIA)를 중심으로 이 제도의 대상이 되는 건축물과 그 내용상의 문제를 분석하여 성능위주 설계를 기반으로 하는 화재 공학적 화재예방 개선방안을 도출하였다. 먼저 법 기준개선측면에서는 첫째 성능위주설계(PBD)평가와 재해영향평가 등에 있어서 상당부분이 동일한 내용임에도 불구하고 두 개의 법령으로 이원화된 부분은 일치 시키고 통폐합해서 운영하는 것이 필요하다. 둘째, 성능위주설계(PBD)평가와 재해영향평가(DIA)의 통폐합이 불가능하다면, 성능위주설계(PBD)평가와 재해영향평가(DIA)의 내용의 영역이 명확히 구분되어 정립되어야 한다. 다음 초고층 건축물의 공학적 화재위험성에 대한 개선방안으로는 NFPA 규정대로 첫째 특별 피난 계단에서 직통계단의 규정을 개정할 필요가 있으며, 배연창 대신 기계식 배연설비를 설치하는 경우, 미국에서 사용하는 샌드위치 가압방식(Sandwich Pressurization) 허용하고, 둘째 특별 피난계단용 제연설비는 화재시 구간별로 급기 할 수 있도록 기준의 개정 및 설계초기 단계부터 준공까지 성능위주설계 진행 등이 필요한 것으로 나타났다. 향후 이상의 연구에서 도출한 개선책 반영과 함께 초고층 건축물의 대한 또 다른 고려사항들에 대해 추가적인 연구가 진행되고, 또한 유지관리에 대한 연구가 진행되어 그 결과를 반영할 수 있는 초고층 건축물이라면 화재로 인한 인명피해 및 재산손실을 줄이는데 획기적인 기여를 할 것으로 예상된다.