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등부표 식별용 LED 발광 번호판을 활용한 해상교통 안전에 관한 연구
심무준(Moo-Jun Shim),이태환(Tae-Hwan Lee) 한국항해항만학회 2010 한국항해항만학회 학술대회논문집 Vol.2010 No.춘계
전통적인 항로표지는 등광(동명기)에 의존하여 항로 및 위험물을 표시함으로써 통항선박의 안전을 확보하여 왔으나, 울산항을 비롯한 전국 무역항에서 입지조건이 유리한 항만배후단지가 개발됨에 따라 항만배후광이 증가하였고 항로표지의 야간시인성이 현격하게 떨어지는 현상이 발생하였다. 또한, 전국 무역항에서는 체선율 저감을 통한 항만 운영율 향상을 위하여 야간 입출항 제한규모를 단계적으로 향상하고 있어 이에 대비한 통항선박의 안전확보방안 마련이 시급히 요구되고 있는 실정이다. 이에 항행원조시설인 등대 및 등표등에 등탑직접조명방식(LED논네온 등)을 비롯한 고광력 등명기 등이 적용되었고, 상대적으로 시인성이 떨어지는 등부표에서는 시인성 향상과 선위결정이 용이하도록 LED발광번호판을 개발하여 적용한 결과, 항만 이용자들로부터 호평을 받고 있으며 앞으로도 항만배후광 극복을 위한 항로표지의 발전은 계속되어야 할 것이다. The traditional Aids to Navigations(AtoN) have been ensuring the Safety of ships by indicating the passage and dangers by depending on the flashing lights. But the more the industrial complex behind port which is all over the country involving the Ulsan port developed, the more the lights behind port is stronger, and then the distingshment of the signal of AtoN from the lights behind port is more difficult. And It is urgently needed to prepare the counterplan about the ensurement of safety because the authorities levels up the limit tonnage of the ships which are sail in and out during night to improve the operation of port through reducing of the traffic jam. So, the method of direct lighting like LED non-neon is applied to unmanned lighthouses or light beacon, and the LED flashing number plate is applied to light buoys whose light power is weaker than to improve distinguishment and to be easy positioning of ships. As a result, the users af UIsan port comment favorably on this item and the deverlopment of AtoN must be continuos to overcome the lights behind port.
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한강 최종방류수의 수질 및 물질 방류량의 장기변동 연구
정태윤 ( Tae-yoon Jung ),윤동혁 ( Dong-hyck Yun ),심무준 ( Moo-jun Shim ),이승목 ( Seung-mok Lee ),윤이용 ( Yi-yongyoon ) 한국수처리학회(구 한국수처리기술연구회) 2018 한국수처리학회지 Vol.26 No.5
The Han River discharges 18×109 tones of freshwater per year into the Yellow Sea, and its variation of water quality influences its estuary. In order to analyze the direct effect of the long-term variations of the water quality and material flux on the ecosystem of the Han River’s estuary, we collected water quality data(e.g., water temperature, dissolved oxygen, COD, nitrogen, phosphorus, suspended solids(SS), and chlorophyll-α) for 23 years(1994~2017). Discharge from the Han River into the Yellow Sea was influenced by rainfall of the watershed of the river based on positive relation between the discharge and amount of rainfall, but the discharge has been seasonally regulated by dams constructed in up- and mid-stream. Phosphate and ammonia concentrations showed a decline while nitrate concentrations consistently increased. COD and SS displayed a decline before the dam construction in 2013 but increased afterwards. On the contrary, DO consistently increased before dam construction in 2013 but decreased afterwards. Change in water quality by river discharge was distinct when river discharge was minimal.This resulted in distinct seasonal change. The flux of COD, chlorophyll-α, ammonia and phosphate decreased, but SS flux increased after 2013 which means that the flux of organic matter and nutrients decreased when the SS flux increased.
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