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2021년 하계와 동계의 광양만 해양수질 및 해저퇴적물 환경
정민기(Mingi Jeong),김건우(Geonwoo Kim),조성민(Seongmin Cho),조현서(Hyeonseo Cho) 한국해양환경·에너지학회 2021 한국해양환경·에너지학회 학술대회논문집 Vol.2021 No.10
본 연구지역인 광양만은 한반도 남해안 중앙부에 위치하는 반 폐쇄성만으로 동쪽은 노량해협을 통해 진주만과 연결되며, 북쪽으로는 서천, 동천, 수어천, 그리고 섬진강이 발달해있고, 남쪽 방향으로 여수해만과 연결되어 있다. 한편 광양만은 급속한 산업, 경제적인 발전과 늘어나는 인구로 인해 환경오염에 쉽게 노출되어 있으며, 생활하수 및 공단지역으로부터의 다양한 오폐수가 유입되기 쉬운 지리적 여건을 지니고 있다. 그래서 본 연구는 광양만 해역의 해양수질환경 및 해저퇴적물 환경을 파악하여 기초자료로 제공하고자 한다. 광양만 인근 해역의 12개 정점을 선정하여 2021년 02월 25일 동계, 2021년 7월 15일 하계에 걸쳐 조사를 실시하였다. 표층 해수는 고무 용질의 소형바스켓, 저층은 Van Dorn 채수기를 이용하여 채수하였고, 퇴적물은 Van Veen grab sampler로 채취하였다. 분석항목은 수온, 염분, 용존산소, 화학적산소요구량, 영양염류 등 13개의 항목이며, ‘해양환경공정시험기준(해양수산부, 2020)’에 준하여 분석을 실시하였다. 퇴적물 COD의 경우 일본수산 용수기준치를 적용하여 나타내었으며, 또한 주성분 분석을 실시하여 해역의 특성을 파악하였다. Gwangyang bay is a semi-closed sea area located in the center of the southern coast of the Korean Peninsula. And, the bay is easily exposed to environmental pollution due to rapid industrialization, economic development and increasing population, and has geographical conditions where various wastewater from living sewage and industrial complexes is easily introduced. Therefore, this study aims to identify the seawater quality environment and the sediment environment in Gwangyang bay. Twelve sites near Gwangyang bay were selected and investigated in winter on 02/25/2021 and summer on 15/7/2021 respectively. Surface seawater was collected using a rubber basket and a Van Dorn sampler, and sediments were collected using a van Veen grab sampler. The analysis items are 13 items including water temperature, salinty, DO, COD, and nutritious salts, and the analysis was conducted in accordance with the Marine Environment Processing Test Standard (The Ministry of Maritime Affairs and Fisheries, 2020). The results were analyzed by PCA(principal component analysis) to identify the characteristics of the sea area.
정민기(Mingi Jeong),김지수(Jisu Kim),장서형(Seohyeong Jang),이태재(Tae-Jae Lee),심형보(Hyungbo Shim),고형호(Hyoungho Ko),조규진(Kyu-Jin Cho),조동일(Dong-Il “Dan” Cho) 제어로봇시스템학회 2016 제어·로봇·시스템학회 논문지 Vol.22 No.9
Micro-electro-mechanical systems (MEMS) gyroscopes are widely used in various robot applications. However, these conventional gyroscopes need to vibrate the proof mass using a built-in actuator at a fixed resonance frequency to sense the Coriolis force. When a robot is not moving, the meaningless vibration of the gyroscope wastes power. In addition, this continuous vibration makes the sensor vulnerable to external sound waves with a frequency close to the proof-mass resonance frequency. In this paper, a feasibility study of a new type of gyroscope inspired by insect halteres is presented. In dipterous insects, halteres are a biological gyroscope that measures the Coriolis force. Wing muscles and halteres are mechanically linked, and the halteres oscillate simultaneously with wing beats. The vibrating haltere experiences the Coriolis force if the insect is going through a rotational motion. Inspired by this haltere structure, a gyroscope using a thin mast integrated with a robot actuation mechanism is proposed. The mast vibrates only when the robot is moving without requiring a separate actuator. The Coriolis force of the mast can be measured with an accelerometer installed at the tip of the mast. However, the signal from the accelerometer has multiple frequency components and also can be highly corrupted with noise, such that raw data are not meaningful. This paper also presents a suitable signal processing technique using the amplitude modulation method. The feasibility of the proposed haltere-inspired gyroscope is also experimentally evaluated.
2021년 하계 동중국해의 해양수질환경 및 해저퇴적물환경
조성민(Seongmin Cho ),김연수(Yeonsu Kim),정민기(Mingi Jeong),조현서(Hyeonseo Cho) 한국해양환경·에너지학회 2021 한국해양환경·에너지학회 학술대회논문집 Vol.2021 No.10
본 연구 대상지역인 동중국해 해역은 한국과 일본, 중국이 서로 인접하고 있으며, 대만난류, 중국에서 흘러나온 연안수와 황해 저층냉수 등의 다양한 수괴들이 서로 상접하며, 다양한 환경특성을 나타내고있다(Zhang and Weng et al., 1996). 특히, 하계에는 양자강으로부터 흘러 나오는 담수의 영향을 크게 받는 지역이며, 먹이생물이 풍부하며, 기초생물생산성이 높아서 어장의 가치가 매우 높은 곳으로 알려져 있다(Guo and Zhang et al., 1996). 이러한 특징적인 환경이 수질환경 및 퇴적환경에 미치는 영향을 해양수질환경 및 해저퇴적물 환경으로 파악하여 기초자료로 제공하고자 한다. 분석항목에는 수온, 염분, DO, COD 등 13개의 항목에 대해 ‘해양환경공정시험기준(해양수산부, 2020)’에 준하여 분석을 실시하였다. 표층에서 수온은 21.89 ~ 25.43 ℃, 염분은 24.13 ~ 32.33 psu, 수소이온농도는 8.22 ~ 8.47, 부유물질은 2.43 ~ 7.29 mg/L, COD의 경우에는 1.04 ~ 2.36 mg/L, Chl-a는 1.83 ~ 6.48 μg/L, 용존 무기질소는 평균 1.17 ~ 3.11 uM, 인산은 평균 0.02 ~ 0.11 uM, 규산 규소는 3.52 ~ 10.69 uM, 총 질소는 0.226 ~ 0.323 mg/L, 총 인은 0.006 ~ 0.024 mg/L 의 범위를 나타내었다. 퇴적물 COD의 경우 일본 수산용수기준치인 20mg/g-dry(일본수산자원보호협회편, 2000)보다 낮은 값을 나타내었다. 또한 주성분 분석을 실시하여 해역의 특성을 파악하였다. In the East China Sea, the subject area of this study, Korea, Japan, and China are adjacent to each other, and various water masses such as the Taiwan warm current, coastal water flowing from China and cold water from the Yellow Sea are in contact with each other, showing various environmental characteristics(Zhang and Weng et al., 1996). In particular, it is an area that is greatly affected by freshwater flowing from the Yangtze River in the summer, and it is known as a place of high valuable fishery because of its abundant food organisms and high productivity of basic organisms (Guo and Zhang et al., 1996). The effect of these characteristic environments on the seawater quality environment and sedimentation environment is to be provided as basic data by understanding the seawater quality environment and the marine sediment environment. Thirteen items such as water temperature, salinity, dissolved oxygen (DO), chemical oxygen demand (COD) were analyzed according to the Marine Environment Processing Test Standard (The Ministry of Maritime Affairs and Fisheries, 2020). The concentrations of the surface water temperature ranged from 21.89 to 25.43 ℃, the Salinity ranged from 24.13 to 32.33 psu, pH ranged from 8.22 to 8.47, Suspended Particulate Matter(SPM) ranged from 2.43 to 7.29 mg/L, COD ranged from 1.04 to 2.36 mg/L, Chl-a ranged from 1.83 to 6.48 μg/L, DIN ranged from 1.17 to 3.11 uM, DIP ranged from 0.02 to 0.11 uM, DSi ranged from 3.52 to 10.69 uM, TN ranged from 0.226 to 0.323 mg/L, TP ranged from 0.006 to0.024 mg/L. Sediment showed lower concentration of COD than 20 mg/g-dry each which are the fisheries environment standard in Japan(Association of marine resource preservation of Japan, 2000). Principal component analysis was performed to characterize the seawater quality.