영산강 하구역에 서식하는 진주담치, Mytilus edulis (이매패강:홍합과)의 성장

박경양,임현식 木浦大學校 沿岸環境硏究所 1995 沿岸環境硏究 Vol.12 No.1

영산강 하구역에 서식하는 진주담치의 성장을 파악하기 위하여 하구역에 1개소를 설정하고 1995년 2월부터 1995년 11월까지 진주담치를 채집하였다. 조사결과 진주담치는 2∼3개의 코호트의 출현이 관찰되었고, 비만도의 경우 봄철인 3월이 가장 높았으며, 4∼5월에는 감소하였다. 또한 8월까지는 약간 증가하였으나 9월부터는 감소되는 양상이었다. 따라서 치패 출현상황과 비만도지수의 변화로부터 산란 및 착저는 봄철인 4∼5월경 및 가을철인 9∼10월경으로 추정되었다. 성장부위별 상대성장은 각장(SL)에 대한 각고 (SH)의 상대성장은 SH=5.2416+0.4724SL(r²=0.835)로 나타났으며, 각장 (SL)에 대한 각폭 (SB)의 상대성장은 SB=1.7482+0.3676SL (r²=0.858)로 나타났다. 각장 (SL)에 대한 전중 (TW)의 상대성장은 ??로 나타났으며, 각장 (SL)에 대한 육중 (MW)의 상대성장은 ??로 나타났다. A study on the growth of mussel, Mytilus edulis, was carried out in Yongsan River estuary, Korea from February to November 1995. Quantitative samplings were conducted monthly at the intertidal hard substrate, using a quadrat with 1 ㎡ surface area. Based on the size frequency of the shell length of mussel, two or three cohorts were observed in each month. Fatness is relatively higher in spring and autumn than in other season. The results of fatness and size frequency distribution of shell length suggest that the spawning seasons should be spring(April to May) and autumn(September to October), and the mass settlement of young spats was chiefly occurred in spring and autumn seasons. The relationship between shell length (SL) and shell height (SH) is SH= 5.2416+0.4724SL(r²=0.835), SL and shell breadth (SB) is SB=1.7482+0.3676SL(r²=0.858), SL and total wet weight (TW)is ??, and SL and meat weight(MW) is MW=0.036 ??.

방조제 건설 전후에 목표해역의 오염물질 확산 메커니즘

강주환,임병선,이점숙,김종욱,임현식,김하송 한국환경생물학회 1998 환경생물 : 환경생물학회지 Vol.16 No.4

육상으로부터 목포해역으로 영양염류가 유입되는 곳과 간조시 갯벌을 통과한 지역의 pH, DO, COD, HN_4-N, NO_3-N 및 T-P 함량을 측정하고 RMA 모형과 FIT모형을 사용하여 방조제 건설에 따른 유기물질의 확산양태를 모의하였다. 목포 인근해역의 수질은 양호하였으며 특히, 갯벌 통과 후 질소원은 증가하였고 COD와 T-P는 감소하였다. 영암/금호 방조제 건설에 따라 방조제 인근해역에서 해수이동양상이 급격히 둔화되었고 목포해역의 북쪽과 4단계 방조제 해역간의 해수교환이 크게 증가하였으며 목포해역의 남쪽에서는 외해수와의 해수교환이 크게 감소하였다. 결과적으로 방조제 건설로 인해 방조제 인접해역에 축적되는 유기물질이 크게 증가하여 목포해역 내외부의 유기물질 확산양상에 적지 않은 영향을 미치고 있다. The pH, Do, COD, NH_4-N, NO_3-N and T-P of sea water were measured in both sites effluencing sewage and passing through salt marsh, and also the RMA and FIT model were applied to the Mokpo coastal zone to analyze the changes of pollutant dispersion mechanism by constructions of the seawalls. The nitrogen source of sea water in the sites passing through salt marsh increased but COD and T-P decreased. After constructions of the Youngam/Kumho seawalls, tidal velocity was decreased and exchange of sea water was very increased between the north of the Mokpo coastal zone and the 4th seawall region and was very decreased between the south of the Mokpo coastal zone and outer sea water. The results of simulation on diffusion of organic matter indicate that most region of the Mokpo coastal zone will suffer deepened contamination after the constructions.

The Spatial Distribution and the Biodiversity of Benthic Molluscs in Yuboodo Island Tidal Flat for World Heritage Nomination

Hyun-Sig Lim,Mun-Seong Gwak,Young-Bin Jo 한국수산해양기술학회(구 한국어업기술학회) 2015 한국수산해양기술학회 학술발표대회 Vol.2015 No.10

The Spatial Distribution and the Biodiversity of Benthic Molluscs in Yuboodo Island Tidal Flat for World Heritage Nomination

Hyun-Sig Lim,Mun-Seong Gwak,Young-Bin Jo 한국수산과학회 양식분과 2015 한국수산과학회 양식분과 학술대회 Vol.2015 No.10

임베디드 시스템을 이용한 웹기반 감시 시스템 구현

임홍식(Hong-Sig Lim),이현철(Hyun-Chel Lee),남현도(Hyun-Do Nam),강철구(Chul-Goo Kang) 대한전기학회 2003 대한전기학회 학술대회 논문집 Vol.2003 No.7

Laser-assisted machining에서 질화규소 시편의 표면온도와 절삭특성에 관한 연구

임세환,이제훈,신동식,김종도,김주현 한국레이저가공학회 2009 한국레이저가공학회지 Vol.12 No.1

In laser-assisted machining (LAM), laser beam is used to locally increase the temperature of a workpiece and thus to enhance the machinability. In order to set the temperature of the material removal area of a workpiece at an optimal value, process parameters, such as laser power, feed rate, and rotational velocity, have to be carefully controlled. In this work, the effects of laser power and feed rate on the temperature distribution of a silicon nitride rotating at a constant velocity were experimentally investigated. Using a pyrometer, temperatures at various locations of the silicon nitride were measured both in circumferential and axial directions. The measured temperatures were fitted to a quadratic equation to approximate the temperature at the cutting location. The machining results showed that cutting force and tool wear were decreased when the temperature at the cutting location was increased.

신경회로망에서 뉴런간의 연결도를 이용한 4백 배치 문제 해결 알고리즘

현해진,김덕주,강부식,이기태,임재윤 濟州大學校 工科大學 産業技術硏究所 1993 産業技術硏究報告 Vol.4 No.-

In this paper we have proposed a method for solving a four-coloring problem using adjusted information transmission between adjacent neurons in neural networks. These algorithms are based on McCclloch-Pitts binary neuron model neural networks. If a map shares n regions, a 4×n neural array is used to color a map of n regions where each neuron as a processing element performs it. By programming these algorithm by a C-language in IBM PC 486 DX and adapting it to various examples, we have showed the ability of our system. If one neuron is selected among four neurons, the strength of order three neurons is wakened. So, by transmitting the information of selected neuron, adjacent neurons cannot share the same color.

Effects of ticagrelor on neointimal hyperplasia and endothelial function, compared with clopidogrel and prasugrel, in a porcine coronary stent restenosis model

Kim, Hyun Kuk,Jeong, Myung Ho,Lim, Kyung Seob,Kim, Jung Ha,Lim, Han Chul,Kim, Min Chul,Hong, Young Joon,Kim, Sung Soo,Park, Keun-Ho,Chang, Kyoung-Sig Elsevier 2017 INTERNATIONAL JOURNAL OF CARDIOLOGY Vol.240 No.-

<P><B>Abstract</B></P> <P><B>Background</B></P> <P>Several investigations have been conducted to evaluate the off-target effects of ticagrelor. The aim of the present study was to evaluate the off-target effects of ticagrelor such as neointimal formation and endothelial function after drug-eluting stent implantation in a porcine restenosis model.</P> <P><B>Methods</B></P> <P>A total of 30 pigs were randomly allocated based on the following P2Y<SUB>12</SUB> inhibitor: (1) clopidogrel 300mg loading plus 75mg maintenance (n=10); (2) prasugrel 60mg loading plus 10mg maintenance (n=10); (3) ticagrelor 180mg loading plus 180mg maintenance (n=10). In each group, zotarolimus-eluting stents were implanted in the proximal portion of the left anterior descending artery and left circumflex artery. One month after stenting, the animals underwent follow-up angiography, endothelial function assessment, optical coherence tomography (OCT) and histopathological analysis.</P> <P><B>Results</B></P> <P>Regarding vasomotor responses to acetylcholine infusion, there were significant vasoconstrictions to maximal acetylcholine infusion in the clopidogrel and prasugrel group compared with those in the ticagrelor group. The mean neointimal area were significantly lower in the ticagrelor group (1.0±0.3 by OCT, 0.9±0.3 by histology), than in the clopidogrel (1.8±0.7, p=0.003, 1.6±0.8, p=0.030) and prasugrel (1.8±0.5, p=0.001, 1.5±0.5, p=0.019) groups. Percentages of moderate to dense peri-strut inflammatory cell infiltration were significantly lower in the ticagrelor group (9.0%) compared with the clopidogrel (17.3%, p<0.001) and prasugrel groups (15.7%, p=0.002). There were no significant differences in all findings between clopidogrel and prasugrel groups.</P> <P><B>Conclusions</B></P> <P>Compared to clopidogrel and prasugrel, ticagrelor reduced neointimal formation, endothelial dysfunction, and peri-strut inflammation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ticagrelor reduced neointimal formation and endothelial dysfunction compared to both clopidogrel and prasugrel. </LI> <LI> The degree of peri-strut chronic inflammatory cell infiltration was significantly lower in ticagrelor group. </LI> <LI> More potent platelet P2Y12 inhibition by prasugrel did not result in any differences with clopidogrel. </LI> </UL> </P>

여자만 연성저질의 여름철 대형저서동물 공간분포

임현식,Lim, Hyun-Sig 한국해양학회 2015 바다 Vol.20 No.2

여자만 저서동물 군집 구조를 파악하기 위하여 87개 정점에서 2001년 7월 grab 채집을 통한 현장 조사를 수행하였다. 여자만은 만 중앙부를 중심으로 니질 퇴적상이 폭넓게 나타나고 있으며 하천으로부터 담수가 유입되는 하구역에서는 모래 함량이 높았다. 조사기간 동안 총 274종, 평균 2,346 개체/$m^2$ 및 $78.2g/m^2$의 저서동물이 출현하였다. 출현종수에서는 다모류가 122종(45%)으로서 가장 우점하였으며, 갑각류가 70종(26%), 연체동물이 57종(21%) 출현하였다. 출현종수 공간분포는 퇴적상 및 저층염분과 유의한 상관관계가 있었다. 출현밀도에서도 다모류가 1,543 개체/$m^2$로서 66%를 점유하였는데 모래 함량과는 양의 상관관계를, 니질 및 평균 입도와는 음의 상관관계를 보였다. 극피동물의 밀도는 염분과 양의 상관관계를 보였다. 반면 생체량에서는 연체동물이 $44.4g/m^2$으로서 57%를 점유하였는데, 실트 및 분급과 음의 상관관계를 보였다. Bio-Env 분석 결과 저층염분과 모래 함량의 조합이 대형저서동물 군집에 영향을 미치는 주된 환경요소로 나타났다. 주요 우점종으로서는 기수성 다모류인 Minuspio japonica가 평균 1,167 개체/$m^2$로서 가장 우점하였으나 벌교천 하구역에만 제한적으로 분포하였으며, 옆새우류인 Eriopisella sechellensis의 밀도는 152 개체/$m^2$로서 여자만 내에 광범위하게 분포하였다. 또한 다모류인 Sternaspis scutata와 이매패류의 Corbiculina sp.도 우점적으로 출현하였다. 종 다양도(H')는 여자도를 중심으로 여자만 남측해역은 3.0 이상의 값을 나타낸 반면, 북측해역은 2.0~3.0 범위의 값을 나타내었으며 염분과 양의 상관관계를 보였다. 집괴분석 결과 5개 정점군으로 구분되었는데, SIMPER 분석결과 Minuspio japonica, Eriopisella sechellensis 그리고 Sternaspis scutata의 기여도가 높았으며 여자만 입구에서부터 내만으로 들어가면서 정점군이 순차적으로 배열되는 양상을 보였다. 본 연구 결과로부터 여자만의 여름철 대형저서동물 군집은 퇴적상과 저층염분에 의해 영향을 받고 있음을 알 수 있으며 여자만의 저서환경 변동을 파악하기 위해 주요 우점종 및 군집 공간 분포에 대한 지속적인 모니터링이 필요하다고 판단된다. Macrobenthic community was studied at 87 stations including intertidal and subtidal area in Yoja Bay, south coast of Korea in summer season of July 2001. Duplicate sediment samples were taken using a van Veen grab ($0.1m^2$) in each station. Mud facies of the sediments were widly distributed in the bay. And relatively high content of sand was shown in the Bulgyo-cheon stream estuary. A total of 274 species was occurred with a mean density of $2,346ind./m^2$ and a mean biomass of $78.2g/m^2$. The polychaetes were species- and density-dominant faunal group with a total of 122 species (44.5% of the total number of species), and mean density of $1,543ind./m^2$ (65.8% of the mean density). Meanwhile, molluscs were biomass-dominant faunal group with $44.4g/m^2$. Bio-Env. analysis showed that the combination of bottom salinity and sand content of the surface sediments was highly correlated to the major macrobenthic communities. The macrobenthic species number, decreasing toward inner bay from mouth of the bay, was significantly correlated to the sediment environmental variables and bottom water salinity. The spatial distribution of abundance showed significant correlation to the sand and mud contents and mean grain size of the surface sediments. Major dominant species were Minuspio japonica (polychaete) with a mean density of $1,167ind./m^2$ at upper part of the bay where salinity was low and Eriopisella sechellensis (amphipod) with $152ind./m^2$ in central part of the bay. Species diversity (H') was $3.0{\leq}$ in the mouth part of the bay and ranged 2.0-3.0 in the inner part of the bay, which showed a significant positive correlation to bottom salinity. Total number of species also showed significant correlations to the sediment composition and bottom salinity. Based on the cluster analysis the macrobenthic community of the bay was classified into five station groups from the bay mouth toward the inner part of the bay depending on the species composition. From the SIMPER analysis Minuspio japonica, Eriopisella sechellensis and Sternaspis scutata mainly contributed to the classification of station group. These results suggested that the macrobenthic communities of the bay were mainly influenced by bottom salinity together with sediment composition, and that the studies of spatial distributions of major dominant species and benthic communities should be conducted continuously to monitor the Yeoja Bay benthic environment.

진해만 저서동물의 군집생태 2. 우점종의 분포

임현식,홍재상,LIM Hyun-Sig,HONG Jae-Sang 한국수산과학회 1997 한국수산과학회지 Vol.30 No.2

진해만의 저서동물 군집의 생태학적 연구의 일환으로 주요 우점종의 분포 양상을 조사하였다. 출현종의 개체수 및 출현 빈도를 동시에 고려하여 우점종을 선별한 결과, 총 287종 가운데 상위 13종이 전체 출현 개체수의 $70\%$ 이상을 차지하였으며, 다모류가 11종 $(85\%)$, 연체동물의 2종 $(15\%)$을 차지하였다. 개체수 우점종은 다모류의 Lumbrineris longifolia와 Paraprionospio pinnata 및 이매패류인 Theora fragilis였으며, 각각 평균 $173.3({\pm}55.4),\;169.3({\pm}257.8),\;81.8({\pm}93.3)$ 개체/$m^2$이 밀도였다. 한편 생물량 우점종은 14종이 전체 채집된 생물량의 $75\%$ 이상을 차지하고 있으며 다모류가 6종, 연체동물이 7종, 극피동물이 1종이었다. 이매패류인 Macoma tokyoens그 및 Periglypta cf. puerpera, 그리고 다모류인 Paraprionospio pinnate의 생물량이 우점하여 이들이 전체 생물량의 약 $45\%$ 이상을 차지하였으며, 생물량은 각각 $14.69({\pm}30.17),\;8.17({\pm}29.40),\;4.17({\pm}11.93)\;g/m^2$이었다. 한편 이들 우점종 가운데 6종의 다모류와 1종의 이매패류 (Lumbrineris longifolia, Paraprionspio pinnata, Aricidea jeffreysii, Magelona japonica, Sigambra tentaculata, Raetellops pulchella, Glycinde gurjanovae)에 대하여 분포 특성을 논의하였다. 대체로 유기물 함량이 높은 내만해역에 주로 서식하는 Lumbrineris longifolia, Paraprionospio pinnata, Aricidea jeffreysii, Sigambra tentaculta, Raetellops pulchella와 만의 입구역에 서식하는 Magelona japonica, Glycinde gurjanovae, Sternaspis sutata, Theora fragilis 등의 분포가 특징적이었다. 진해만 전해역에 광범위하게 분포하는 종은 Lumbrineris longifolia, 중앙부 일부 정점에 우점하게 분포하는 종은 Paraprionospio pinnata Aricidea jeffreysii, Sigambra tentaculata로서, 이들은 퇴적물 유기물 함량이 비교적 높은 해역에서 출현하고 있어 유기물 오염의 지표종으로 사용될 수 있는 가능성을 시사하고 있다. A study on the distribution of the major domiant species of macrobenthos was carried out in Chinhae Bay from lune 1987 to May 1990. The 13 dominant species, based on the number of individuals and frequency, occupied more than $70\%$ of the total individuals. Of these species, 11 species represented polychaetes $(85\%)$ and 2 species molluscs $(15\%)$. The dominant species included Lumbrineris longifolia, Paraprionospio pinnata and Theora fragilis, with a density of $173.3({\pm}55.4),\;169.3({\pm}257.8)\;and\;81.8({\pm}93.3)\;ind./m^2$, respectively. In terms of biomass these dominant species occupied move than $75\%$ of the total biomass of the macrobenthos. These were composed of 6 species of polychaetes, 7 of molluscs and one echinoderm. The biomass of Macoma tokyoensis, Periglypta cf. puerpera and Paraprionospio pinnata were predominant (more than $45\%$ of the total biomass), and their biomass were $14.69({\pm}30.17),\;8.71({\pm}29.40),\;4.17({\pm}11.93)g/m^2$, respectively. In terms of density, distribution patterns of Lumbrineris iongifolia, Paraprionospio pinnata, Aricidea jeffreysii, Magelona japonica, Sigambra tentaculata, Raetellops pulchella, Glycinde gurjanovae were discussed. In the inner area of the bay with high organic content, Lumbrineris longifolia, Paraprionospio pinnata, Aricides jeffreysii, Sigambra tentaculata, Raetellops pulchella were pvedominant, whereas in the mouth of the bay with low organic content, Magelona japonica, Glycinde gurjanovae, Sternaspis scutata, Theora fragilis were dominant. Lumbrineris longifolia was widly distributed throughout the bay. However, Paraprionospio pinnata, Aricidea jeffreysii and Sigambra tentaculata had high density particularly in the central pan of the bay where there was high organic content in surface sediment, and these species possibly can be used as the potential pollution indicating species.