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제주 서해 연근해 해역에서의 저서어족 생물 분포에 관한 연구
박예찬(Yeechan PARK),유진영(Jinyoung YOO),신형호(Hyeong-Ho SHIN),김영훈(Younghun KIM),김대진(Daejin KIM) 전남대학교 어업기술연구소 2021 어업기술연구소보고지 Vol.14 No.1
본 연구는 제주 서해 연근해 해역에서의 저서 어족생물의 조성, 체장, 중량을 파악하기 위하여 2018년 10월 22일부터 10월 24일까지 총 3회의 트롤 조사를 실시하였다. 조사해역에서의 어족자원에 대한 종조성은 1회 조사에서 우점종은 아귀, 꼼치, 갈치순으로 나타났고, 2회 조사에서 우점종은 딱새우, 아귀, 원숭이게, 성대 순으로 나타났으며 3회 조사에서 우점종은 아귀, 살오징어, 성대 순으로 나타났다. 총 3회 조사에서 어획된 개체 수 기준으로 총 어획량은 아귀가 제1의 우점종으로 나타났으며 다음으로 딱새우, 살오징어 순으로 나타났다. 또한 트롤 조사에서 어획된 어족생물에 대한 체장별 크기는 151∼200 mm 사이에서 최대 어획량을 나타내고, 어획된 중량은 다양한 어종이 다수 어획되어 중량 변화의 폭이 컸으며 거의 대부분 101∼200 g 사이의 저서어족이 어획되었는데 아귀의 경우, 체장이 작은 미성숙어 어류도 다수 어획되었다. 제주 근해 해역의 어장들은 적도에서 발원하여 태평양 서안을 따라 대만 동쪽으로 올라온 난류가 대마도를 거쳐 동해로 유입되는 대마 난류의 길목에 위치하여 각종 어류들의 회유와 산란 및 서식지로서 어업이 활발한 좋은 어장으로 알려져 있다. 그러나 제주 서해 연근해 해역 어장의 경우, 다른 제주도 연근해 해역의 어장들에 비해 어획량이 적은 것으로 나타났는데(Kim. 2017), 이러한 원인으로는 하층에서 상층으로 해수가 이동하는 용승작용이나 저질에 따른 플랑크톤의 차이 등 여러 요인이 있을 수 있다. 따라서 제주도 인근 해역 어장들의 어획량 차이에 대한 원인은 저서어족 생물의 자원 보호뿐만 아니라 다른 우점종의 어족자원에 대한 효율적인 보호와 관리를 위해 지속적인 연구 조사가 필요할 것으로 판단된다. The primary goal of this study is to survey a fisheries resources in west coastal sea area of Jeju island. The method of trawl survey conduct to fishing survey through cod-end of trawl and its cover net. The surveys are carried out 2 days on 22-24<SUP>th</SUP> Oct. in 2018 by the training ship “Sae Dong Baek” of Chonnam National University. The total fish species caught by trawl net during 3 times survey for 2 days were 28 species. In the first superior was Lophiomus setigerus, 378(66%) the next Metanephrops thomsoni, 74(12.9%) the third Todarodes pacificus 14(2.4%). In individual numbers the most fish body length size caught by trawl net was between 150 mm and 200 mm. In individual numbers the least fish body length size caught by trawl net was between 51 mm and 100 mm. The fish weight size caught by trawl net was for the most part, over between 101 g and 200 g. The fish weight size caught by trawl net was for the least part, over between 5,001 g and 15,000 g. Fisheries resource has been decreasing for years and years. For many years fisheries researcher have debated its management and regulation. Much yet studies are necessary about the fisheries resources and regulation. The more fisheries resources must be preserved continually.
Kim, Eunju,Kim, Seong Bum,Baek, Youl Chang,Kim, Min Seok,Choe, Changyong,Yoo, Jae Gyu,Jung, Younghun,Cho, Ara,Kim, Suhee,Do, Yoon Jung The Korean Society of Veterinary Service 2018 韓國家畜衛生學會誌 Vol.41 No.4
Rumen cannulation is used for nutritional and microbiological research, clinical diagnosis, and rumen component transfaunation. However, the cannulation procedure can affect parameters such as complete blood count findings, serum chemistry, and rumen fluid pH. The objective of this study was to evaluate the health risks related to the rumen cannulation procedure over a 1-month period. We did not identify significant differences in red blood cell numbers or morphologies between pre- and postoperative timepoints. Moreover, no inflammation or infection was detected. Despite the absence of apparent clinical signs after surgery, serum chemistry results revealed changes in blood urea nitrogen levels and the activities of liver enzymes, including aspartate transaminase, lactate dehydrogenase, and creatinine kinase, from postoperative days 1 to 14. Rumen fluid pH, as measured from samples collected via an orogastric tube, was slightly increased after a preoperative fasting period and on postoperative day 1 but decreased thereafter from postoperative day 4, indicating a minor influence of cannulation surgery on ruminal fluid pH. This is the first study to evaluate hematological parameters and rumen pH before and after rumen cannulation surgery in Hanwoo cattle. Further research is required to better elucidate the potential effects of rumen cannulation surgery on animal health.
Kim, Junghee,Kim, Jun Young,Kim, Younghun,Lee, Seong Jae,Kim, Ju Min American Chemical Society 2017 ANALYTICAL CHEMISTRY - Vol.89 No.17
<P>Shape measurement of nonspherical micro particles by conventional methods such as optical microscopy is challenging owing to particle aggregation or uncertainty regarding the out-of-plane arrangement of particles. In this work, we propose a facile microfluidic method to align particles in-plane utilizing the extensional flow field generated in a cross-slot microchannel. Viscoelastic particle focusing is also harnessed to move particles toward the stagnation point of the cross-slot microchannel. We demonstrate that the shapes of ellipsoidal particles with various aspect ratios can be successfully measured using our novel microfluidic method. This method is expected to be useful in a wide range of applications such as shape measurement of nonspherical cells.</P>
관측기 기반 온라인 자가동조 선형운동 도립진자 위치제어
김용훈(Younghun Kim),김동수(Dong Soo Kim),김석균(Seok-Kyoon Kim) 제어로봇시스템학회 2020 제어·로봇·시스템학회 논문지 Vol.26 No.7
This study presents an observer-based positioning technique with online self-tuning capability for linear motion inverted pendulum systems. The true system parameter values are not required to implement the control algorithm. The observers for estimating the linear and angular velocities do not use the system parameter information, nominal or otherwise. The online self-tuning mechanism adjusts the closed-loop cut-off frequency during the transient periods. The resulting benefits are verified numerically using MATLAB’s Simulink software.
The Effect of Broodstock Age on the Spawning Performance of Cultured Haliotis discus hannai
Byoung-Hak Kim,KyoungHo Kang,ZhiFeng Zhang,JaeMin Kim,JanDi Kim,YoungHun Kim 한국패류학회 2003 The Korean Journal of Malacology Vol.19 No.2
The effect of broodstock age on the spawning performance of cultured abalone, Haliotis discus hannai, was assessed for five age groups (3, 4, 5, 6, 7 years old). Spawning performance of the five age groups was assessed in terms of the percentage of spawning abalone, eggs per spawning female, fertilization rates, hatch rates and attachment rates per spawning. The percentage of spawning abalone increased along with broodstock age, reached maximum in female groups of 5- and 6-year age (60%), and in male group of 6-year age (100%), subsequently decreased in 7-year age group. The number of eggs produced per spawning also increased with broodstock age, and the maximum was found in 6-year age. Although the number of spawned eggs for the oldest abalone declined, it still spawned much more eggs than 3, 4, and 5 years old females. The fertilization and hatch rates were obviously larger for 4-6 years old group than the younger and older abalones. The maxima were found in 5-year age group (96.0% and 84.5%), and the minimum were appeared in 7-year age group (79.3% and 58.2%). The attachment rate increased with broodstock age, reached maximum in 6-year age group (33.6%), although the increment gradually declined. The attachment rate for 7-year age group rapidly decreased (16.6%). These results suggested that broodstock age affected the spawning performance of H. discus hannai, which peaked between 5 and 6 years old, and broodstock should be bred during this period for hatchery production.
김민영 ( Minyoung Kim ),김영훈 ( Younghun Kim ),김상훈 ( Sanghun Kim ),최용훈 ( Yonghun Choi ),전종길 ( Jonggil Jeon ),김영진 ( Youngjin Kim ),서명철 ( Myungchul Seo ) 한국농공학회 2016 한국농공학회 학술대회초록집 Vol.2016 No.-
Due to a growing and aging population in agriculture, the adaptation of labor-saving, computer-controlled automatic irrigation system becomes more essential to increase crop yield and improve its quality. In addition, water shortage is becoming one of the biggest problem in the world, so much attention has been given to search for technologies/measures to save/conserve water from irrigated areas. The aim of this study is to develop an automatic irrigation system which measures timely variant soil moistures and automatically turns on or off the water supply system based on the programmed logics for blueberry outdoor cultivation. This system also provides the crop evapotranspiration calculated based on the weather data from nearby weather station. A soil moisture sensor is periodically interrogated by a pulse signal provided by the microcontroller via a driver or buffer circuit. A microcontroller is coupled in controlling relationship to the solenoid valves in each zone at predetermined times during a day unless the moisture sensor for that given zone indicates a predetermined sufficient level of moisture present. This study showed that the combination of hardware and software provides an irrigation controller that can be implemented at relatively low cost and which is extremely user friendly. Two-year monitoring and one-year field application showed that the automatic irrigation system based on soil moisture and weather data outperformed considering the fruit marketable yield and quality (weight, diameter, sugar content, firmness, etc.), water productivity and labor-saving.