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인공어초 단지 주변 해양쓰레기 피해 시민모니터링과 수중 레저활동 접목 방안
우민수(Minsu Woo),곽태진(Taejin Kwak),박요섭(Yoseop Park),홍선욱(Sunwook Hong),임세한(Sehan Lim) 한국해양환경·에너지학회 2022 한국해양환경·에너지학회 학술대회논문집 Vol.2022 No.11
인공어초는 대상 해양생물을 정착시키거나 끌어모으고, 그에 대한 배양과 보호의 목적으로 해저나 해중에 시설하는 인공구조물로 해양생물의 서식환경과 특성을 활용한 대표적인 수산자원 조성 방법이다. 2019년 해양수산부에서 발표한 ‘해양레저관광 활성화 대책’ 중 하나로 인공어초를 포함한 해중 경관이 우수한 해역을 스쿠버다이빙 포인트로 지정하여 운영하고 있다. 그러나 일부 인공어초의 경우 폐어구와 같은 해양쓰레기로 인해 원래의 기능을 상실하고, 어초에 걸린 폐어구는 유령어업을 계속하게 되는 악순환이 이어진다. 현재 해양폐기물 수거 사업은 지자체 중심으로 진행되고 있고, 인공어초 관리에 관한 통합적 자료는 미흡하다. 또한 수거에만 집중되어 발생 시기 및 원인 등과 같은 과학적 자료 역시 부족하다. 해양의 시공간적 특성상 소수의 인력으로 모든 지역을 조사하는 것은 사실상 불가능하며, 이를 보완하기 위한 방법의 하나로 시민과학과의 접목을 제안한다. 최근 스쿠버다이빙과 같은 해양레저스포츠 인구의 증가와 함께 환경보호에 대한 시민의식이 높아지고 있고, 해양의 환경문제에 직접적으로 활동하기를 원하는 사람들이 많아지고 있다. 하지만 현재 국내 해양레저스포츠 인구는 1회성 단순 체험 빈도가 높고 국외 유출 수요가 많다. 이런 스쿠버다이버들에게 수중 쓰레기 밀도 조사 방법인 UDS(Underwater Debris Survey)를 소개하고 인공어초 주변 및 다양한 해양생태계에 오염도를 조사함으로써 시민과학자로서의 역할을 부여하고 지자체에서는 지속적인 해양레저스포츠 인구를 확보하고 인공어초의 관리를 유용하게 할 뿐 아니라 전문연구인력과의 연결을 통해 인공어초 효과 및 관리에 대한 비용효율적인 대안이 될 수 있을 것이라 기대한다. As one of the Marine Leisure Tourism Revitalization Measures announced by the Ministry of Oceans and Fisheries in 2019, underwater areas with excellent scenery, including artificial reefs, have been designated and operated as scuba diving points. However, the original function of reefs is occasionally lost due to marine debris such as abandoned fishing gears, and derelict gears continue a vicious cycle of ghost fishing. Currently, the marine debris collection project is being carried out mainly by local governments, and the integrated data on the management of artificial reefs are insufficient. In addition, scientific data such as the types and cause of marine debris are also lacking. Due to the spatial and temporal characteristics of the ocean, it is virtually impossible to investigate all areas with a small number of people. Recently, along with the increase in the population of marine leisure sports such as scuba diving, public awareness about environmental protection is increasing, and people tend to be directly involved in marine environmental protection activities. However, the current population of domestic marine leisure sports has a high frequency of one-time simple experiences and a high demand for diving tour abroad. The UDS (Underwater Debris Survey), a method of surveying the density of debris deposited or sunken on the sea bottom can give scuba divers a role as citizen scientists by investigating pollution levels around artificial reefs and various marine ecosystems. It is expected that it will be a cost-effective alternative to the effectiveness and management of artificial reefs through the connection of professional researchers and scuba divers as citizen scientists.
Yi, Hoon,Kang, Minsu,Kwak, Moon Kyu,Jeong, Hoon Eui American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.34
<P>We present a simple yet scalable method with detailed process protocols for fabricating dry adhesives with mushroom-shaped micropillars of controlled tip geometries. The method involves using photo-lithography with. a bilayer stack combining SU-8 and lift-off resist, and subsequent replica molding process. This approach utilizes widely used and commercially available materials and can thus be used to generate mushroom-shaped micropillars with precisely controlled tip diameters and, thicknesses in a simple, reproducible, and cost-effective manner. The fabricated mushroom-shaped micropillar arrays exhibited highly different tendencies in adhesion strength and repeatability depending on tip geometries, such as tip diameter and thickness, thereby demonstrating the importance of precise tunability of tip geometry of micropillars. The fabricated dry adhesives with optimized tip geometries not only exhibited strong pull-off strength of up to, similar to 34.8 N cm(-2) on the Si surface but also showed high durability. By contrast, dry adhesives with nonoptimized tips displayed low pull-off strength of similar to 3.6 N cm(-2) and poor durability.</P>
Kim, Najin,Park, Minsu,Yum, Seong Soo,Park, Jong Sung,Song, In Ho,Shin, Hye Jung,Ahn, Joon Young,Kwak, Kyung-Hwan,Kim, Hwajin,Bae, Gwi-Nam,Lee, Gangwoong Elsevier 2017 Atmospheric environment Vol.153 No.-
<P>Aerosol physical properties, chemical compositions, hygroscopicity and cloud condensation nuclei (CCN) activities were measured in Seoul, the highly populated capital city of Korea, during the Megacity Air Pollution Studies (MAPS-Seoul) campaign, in May-June 2015. The average aerosol concentration for particle diameters >10 nm was 11787 +/- 7421 cm(-3) with dominant peaks at morning rush hours and in the afternoon due to frequent new particle formation (NPF) events. The average CCN concentration was 4075 +/- 1812 cm(-3) at 0.6% supersaturation, with little diurnal variation. The average hygroscopicity parameter (K) value determined using a humidified tandem differential mobility analyzer (HTDMA) ranged 0.17-0.27 for a range of particle diameters (30-150 nm). The K values derived using the aerosol mass spectrometer (AMS) data with three different methods were 0.32-0.34, significantly higher than those from HTDMA due to the uncertainties in the hygroscopicity values of different chemical compositions, especially organics and black carbon. Factors affecting the aerosol hygroscopicity seemed to be traffic and chemical processes during the NPF events. The CCN concentration predicted based on HTDMA K data showed very-good agreement with the measured one. Because of the overestimation of K, CCN closure with the predicted CCN concentration based on AMS K data over-predicted CCN concentration although the linear correlation between measured and predicted CCN concentration was still very good. (C) 2017 Elsevier Ltd. All rights reserved.</P>
( Yea-in Park ),( Yeo-eun Cha ),( Minsu Jang ),( Rackhyun Park ),( Sim Namkoong ),( Jongbock Kwak ),( Ik-soon Jang ),( Junsoo Park ) 한국미생물 · 생명공학회 2020 Journal of microbiology and biotechnology Vol.30 No.7
Abelmoschus manihot (Linn.) is a medicinal herbal plant that is commonly used to treat chronic kidney disease and hepatitis. However, its effect on cell proliferation has not been clearly revealed. In this report, we sought to determine the effect of the flower extract of A. manihot (FA) on cell proliferation. Based on our findings, FA increased the proliferation of human diploid fibroblast (HDF) and HEK293 cells. Through cell cycle analysis, FA was found to increase the number of HDF cells in the S phase and G2/M phase. FA also increased the expression of cyclin D1 and enhanced the migration of HDF cells. By administering FA to HDF cells with ≥30 passages, a decrease in the number of senescence-associated β galactosidase-positive cells was observed, thereby indicating that FA can ameliorate cellular senescence. Collectively, our findings indicate that FA increases cyclin D1 expression and regulates cell proliferation.
Lee, Sang-Hyeon,Seong, Minho,Kwak, Moon Kyu,Ko, Hyunwook,Kang, Minsu,Park, Hyung Wook,Kang, Seong Min,Jeong, Hoon Eui American Chemical Society 2018 ACS NANO Vol.12 No.11
<P>Anti-icing materials that can efficiently limit ice formation have a strong potential to replace existing anti-icing techniques, such as Joule heating, chemical release, or mechanical removal, which are usually inefficient, expensive, and environmentally harmful. In this study, an anti-icing material based on a magnetically responsive hierarchical hair array that can actively modulate drop bouncing dynamics is presented. The magnetically responsive hair array exhibits an immediate and reversible structural bending motion in response to an external magnetic field. The array also exhibits superhydrophobicity, regardless of its tilt angle, due to the tapered geometry of the hairs and the multiscale surface roughness of the array. Due to its dynamic structure and water-repellent characteristics, the array can induce distinct multiple modes of drop bouncing behavior by adjusting its structural bending state in a reversible fashion. Three different types of bouncing behavior, namely, quasi-pancake bouncing, directional bouncing, and macrotexture-induced droplet fragmentation, can be obtained with the vertical, tilted, and fully bent hair arrays, respectively. We demonstrate that the dynamically controllable drop bouncing behavior of the magnetically responsive hierarchical array enables the efficient and robust prevention of ice formation and accumulation.</P> [FIG OMISSION]</BR>