• Korean Journal of Ichthyology
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• v.25 no.2
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• pp.82-89
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• 2013

The spawning behavior, development of eggs and larvae of the Five striped damselfish, Abudefduf vaigiensis were studied. The Five striped damselfish were caught at Dolsan Island, Yeosusi, Jeollanamdo from May in 2011. As a result of observation, male fish attracted female after cleaning the rock. Female left after spawning and male protected their eggs until they had hatched out. The fertilized eggs were elliptical in shape (mean long diameter: 1.06 mm; mean short diameter: 0.55 mm) and transparent. Larvae hatched at 53 hrs after fertilization in $24.5{\sim}26.5^{\circ}C$(mean $25.0^{\circ}C$). The newly hatched larvae were 2.55~2.86 mm (mean 2.71 mm, n=10) in total length and their mouth and anus were already opened. They began to eat rotifer and transformed to postlarva stage. 3 days after hatching postlarva was measured 2.74~2.97mm(mean 2.84 mm, n=10) in total length. 10 days after hatching postlarva was measured 3.85~4.20mm(mean 4.00 mm, n=10) in total length with dosal fin rays IV-5; ventral fin rays I-3; caudal fin rays 1~2.

• 한국지구과학회:학술대회논문집
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• 2010.04a
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• pp.90-91
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• 2010

우리나라는 산업화와 도시화의 급속한 발전으로 인한 대기오염물질배출시설, 자동차 통행량, 에너지 사용량의 증가 등으로 대기오염물질배출원의 수와 규모가 증대되어 광역도시를 중심으로 대기질이 악화되고 있다. 특히 우리나라의 수도권대기질은 선진국의 주요 도시에 비해 대기오염 상태가 좋지 않은 것으로 평가됨에 따라 정부는 대기질을 OECD선진국 수준으로 개선한다는 목표를 세우고 있으나, 지역의 대기상태 및 그 동안의 대기질 개선을 위해 이행된 정책의 효율성 측면에서 볼 때 사후적인 규제위주의 농도규제 방식으로는 급증하는 대기오염배출시설의 배출량총량 관리가 어렵고, 지자체별로 개별적인 분산관리로는 광역적으로 이동되는 대기오염물질의 관리가 불가능하다. 또한 대기오염과 상관성이 큰 에너지정책, 산업정책, 도시계획 등 관련 정책과의 통합적 접근이 어렵기 때문에 사전에 이를 예방하는 총량관리가 요구되어 진다. 총량규제란 특정지역의 기상, 지형조건 등을 이용하여 대기환경용량을 산출하고 이를 기초로 지역별 배출허용총량을 할당하여 궁극적으로는 오염원별로 대상오염물질의 삭감량을 정하는 제도로 선진국에서는 대기환경용량을 바탕으로 1970년대부터 사업장을 중심으로 배출농도 규제와 함께 총량규제를 병행 실시하고 있으며, 최근에는 자동차에도 실시하고 있다. 우리나라에서도 대기환경보전법 제9조에서 환경기준을 초과하여 사람의 건강이나 재산, 동식물의 생육에 중대한 위해를 가져올 우려가 있다고 인정되는 경우에는 동 지역 또는 특별대책지역 중 사업장이 밀집되어 있는 구역에 대하여 배출되는 오염물질을 총량으로 규제할 수 있도록 규정하고 있다. 또한, 환경부는 2003년도에 서울, 인천, 경기도내 19개시 지역을 대상으로 대기오염물질의 배출총량을 관리하는 대기오염총량제 실시를 포함한 '수도권대기질개선에관한특별법'을 제정하였고, 현재는 사업장에게 연도별 배출허용총량을 할당하고, 할당량 이내로 오염물질을 배출하도록 관리하는 사업장 대기오염물질총량관리 제도로 시행 중에 있다. 그러나 수도권대기질개선특별대책을 수립하면서 총량관리의 본격 이행 및 배출권 거래제도 도입에 대한 특별법안이 제정되고 부분적으로 시행되고 있으나, 우리나라에 총량관리를 본격 이행하는데 있어서의 필요한 준비여건은 아직 초기 단계이고, 관련 연구의 수행실적 또한 수도권에 제한되어 적은 편이다. 따라서 현재는 총량관리가 수도권에 국한하여 실시되고 있으나, 점차 타 도시까지 광역적으로 확대될 것으로 예상되는 바 이에 필요한 제반 사항들에 대한 조사 분석을 통하여 정책방향을 설정하는 더 많은 연구가 필요할 것이다. 이러한 배경에서 본 연구에서는 대구지역을 대상으로 대기오염농도 및 대기오염물질 배출량에 대한 현황조사를 실시하고, 이를 토대로 고농도가 자주 발생되거나 그러할 가능성이 높은 $NO_X$을 대상으로 대기오염기여도를 평가하고 대기확산모델을 통한 대기환경용량을 산정하였다. 대기오염농도 현황을 살펴본 결과, 대구지역의 대기오염은 $NO_2$, $SO_2$, CO는 전형적인 1차오염물질의 변화경향을 보였으며, $PM_{10}$는 봄철에 황사의 영향을 크게 받는 것으로 나타나 실제 대구지역에서 배출되는 양을 추정하기 힘든 것으로 판단된다. 또한 $NO_2$는 공업, 상업지역에서 $SO_2$와 $PM_{10}$는 공업지역, CO는 상업지역, $O_3$은 교외지역에서 높은 농도를 나타내는 것으로 파악되었다. 대구지역의 대기오염물질 배출량 현황은 CO가 47%, NOX가 43%로 전체 배출량의 90%를 차지하였고, 2005년 이후 $NO_X$는 감소하고 $SO_X$가 증가하는 추세이다. 또한 배출원대분류 중도로 및 비도로이동오염원에서 발생되는 선 오염원이 75%로 대구지역에서 가장 크게 기여하는 것으로 나타났다. ISCST3 대기확산모델을 이용하여 대기환경용량을 산정하기위하여, 먼저 대구지역의 대기환경용량평가는 가시적인 위해성이 높고 개선정책이 용이한 $NO_X$을 대상물질로 선정하였고, 배출량과 오염농도간의 상관도가 0.659로 높은 것으로 판단되어, 배출량을 삭감하였을 때 대기오염농도의 개선이 명확히 나타나는 것을 알 수 있었다. 다음으로, 단위격자 당 한계배출율을 알아내는 작업을 실시하여, 대구지역을 동일하게 장기환경기준 80%수준인 22.4ppb를 만족시키기 위한 한계배출율은 2.23g/s가 필요한 것으로 파악되었고, 산출한 한계배출율을 이용하여 장기환경기준치 80%수준 달성을 목표로 하는 경우의 대기환경용량을 산정하고 실제 배출량과 비교 분석하였다. 그 결과, 대구지역 전체의 환경용량은 약 3만 톤으로 실제 배출량 2만2천 톤에 약 8천 톤 이상의 여유가 있는 것으로 파악되었다. 그러나 구역별로 상이한 차이를 보였으며, 이에 따른 구역별 개선정책이 필요할 것으로 사료된다. 대기환경용량을 파악한 후 단위격자 당 한계배출율을 초과하는 대상 지역을 추출하여 삭감한 결과 초과배출량의 80%를 삭감해야 대구지역 전체에서 50ppb이하 농도가 되는 것을 알 수 있었는데, 실제로 초과배출량의 80%를 삭감하는 것은 어려움이 있다고 판단되어, 대구지역을 동일한 %율로 삭감한 결과 30% 삭감했을 때 50ppb수준을 달성하였고, 50%삭감했을때 2007년 환경기준인 30ppb수준을 달성하였다. 또한 배출원대분류 중 기여율이 높은 도로와 비도로오염원을 50%삭감한 결과 도로이동오염원의 삭감만으로도 상당한 고 배출지역의 농도저감에 효과가 있는 것으로 파악되고, 비도로오염원을 포함하여 삭감하였을 때는 대구지역 전체에서 50ppb이하로 내려가는 것을 볼 수 있었다. 따라서 향후 총량규제의 실시에 맞추어 대구지역의 실제적인 환경용량의 정확한 파악과 고배출지역에 대한 삭감방법에 관한 더 많은 연구가 필요하다고 사료된다. 이 연구 결과는 앞으로 시행될 지역총량규제에 대한 기초적인 방법론으로 활용될 수 있을 것이다.

• Journal of Korean Society of Forest Science
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• v.108 no.4
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• pp.493-512
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• 2019

The purpose of this study was to provide the basic data necessary for establishing a vegetation management plan for the Yeongcheon River area by presenting a better understanding of the distribution and characteristics of naturalized plants through an investigation of the flora present in the Yeongcheon riverside, in Jinju, South Korea. Vascular plants were investigated for a total of 470 taxa, including 90 families, 282 genera, 425 species, one sub-species, 38 varieties, and six forms. Together, these accounted for 9.62% of the vascular plants (4,881 species) in Korea. Gramineae was the most abundant at 77 taxa (16.38%), followed by Cyperaceae at 56 taxa (11.91%), Leguminosae at 33 taxa (7.02%), Cyperaceae at 25 taxa (5.32%), and Rosaceae at 22 taxa (4.86%). Thirty species of indicator plants were surveyed and, among them, annual plants and hemicryptophytes accounted for a significantpercentage. Among ground plants, trees, shrubs, and sub-shrubs were surveyed to include 23 (4.89%), 17 (3.61%), and 14 taxa (2.97%), respectively. Furthermore, 36 aquatic plant taxa were found. Six rare plant taxa were surveyed including Penthorum chinense, Melothria japonica, Aristolochia contorta, Acorus calamus, Millettia japonica, and Magnolia kobus. Floristic special plants comprised 35 taxa,including 26 families, 34 genera, 34 species, and one variety. Plants endemic to Korea included six species. Naturalized plant species comprised 71 taxa, including 18 families, 53 genera, 68 species, and three varieties. The naturalization rate and urbanization index were 15.1% and 22.1%, respectively. Ecological disturbance species in Korea comprised nine taxa, including four families, eight genera, eight species, and one variety. These groups accounted for 64% of the ecological disturbance species in Korea. Ecological disturbance species in Korea tended to increase toward the downstream of Yeongcheon River. In particular, Ambrosia artemisiifolia and Sicyos angulatus, which cause human allergies and disrupt the habitats of plants and animals, must be removed artificially.

• Journal of the korean academy of Pediatric Dentistry
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• v.28 no.2
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• pp.219-227
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• 2001

Little is known about processing mechanism of pain sensation of the oral cavity at the 1st synapse of trigeminal sensory nuclei. Serial ultrathin sections of tooth pulp afferent terminals, identified by the transganglionic transport of 1% wheatgerm agglutinin conjugated horseradish peroxidase, were investigated with electron microscope. Quantitative ultrastructural analysis was performed on digitizing tablet connected to Macintoshi personal computer (software; NIH Image 1.60, NIH, Bethesda, MD). Labeled boutons could be classified into two types by the shapes of containing vesicles : S bouton, which contained mainly spherical vesicles (Dia. 45-55 nm) and few large dense cored vesicles (Dia, 80-120nm), and LDCV bouton, which contained spherical vesicles as well as large number of large dense cored vesicles. Most of the parameters on the ultrastructural characteristic and synaptic organization of labeled boutons were similar between S and LDCV boutons, except shapes of containing vesicles. Majority of the labeled boutons showed simple synaptic arrangement. The labeled boutons were frequency presynaptic to dendritic spine, and to a lesser extent, dendritic shaft. They rarely synapsed with soma and adjacent proximal dendrite. A small proportion of labeled boutons made synaptic contacts with presynaptic, pleomorphic vesicles containing endings and synaptic triad. Morphometric parameters of labeled boutons including volume and surface area, total apposed area, mitochondrial volume, active zone area, vesicle number and density showed wide variation and these were not significantly different between S and LDCV boutons. The present study revealed characteristic features on ultrastructure and synaptic connection of pulpal afferents which may involved in transmission of oral pain sensation.

• Journal of Radiation Protection and Research
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• v.40 no.1
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• pp.1-9
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• 2015

Compton cameras overcome several limitations of conventional mechanical collimation based gamma imaging devices, such as pin-hole imaging devices, due to its electronic collimation based on coincidence logic. Especially large-scale Compton camera has wide field of view and high imaging sensitivity. Those merits suggest that a large-scale Compton camera might be applicable to monitoring nuclear materials in large facilities without necessity of portability. To that end, our research group have made an effort to design a large-scale Compton camera for safeguard application. Energy resolution or position resolution of large-area detectors vary with configuration style of the detectors. Those performances directly affect the image quality of the large-scale Compton camera. In the present study, a series of Geant4 Monte Carlo simulations were performed in order to examine the effect of those detector parameters. Performance of the designed large-scale Compton camera was also estimated for various monitoring condition with realistic modeling. The conclusion of the present study indicates that the energy resolution of the component detector is the limiting factor of imaging resolution rather than the position resolution. Also, the designed large-scale Compton camera provides the 16.3 cm image resolution in full width at half maximum (angular resolution: $9.26^{\circ}$) for the depleted uranium source considered in this study located at the 1 m from the system when the component detectors have 10% energy resolution and 7 mm position resolution.

• Resources Recycling
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• v.5 no.4
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• pp.32-41
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• 1996

The objective of this study was to investigate the facton affecting the property of CaCO, farmed from CaClz-Na,CO,-HiOsystem. The effcct of the concentmtlon of reaclants, impurity, the pH of reaction, the addition of sccd crystal, and injectingvelocity af reaclant solution an thc yield oI CaCO; polymorphs. parlide size and whiteness of CaCO, were investigated. Thcmqor resulls are ;o fallows; I The optimum concentratinn of reildilnts for forming vaterlte and aragonite is the range of 0.1-1.0 mol/l, when the yicld of vittcrite and araga~nles howed 7542% and XU-90%. respedively. 2. Among thc composition of impunticscontained h limestone, Fe' decrease the wh~tcness nf CaCO;. md Mg" increase the yield of aragonite. 3. The pHrange of vaterite and aragonite are formed with high yield is 8-11, and Calcite is famed in pH 6-8 with big particle size of 1over and in pH 11-13 with small particle size of I under. 4. The yicld of calcite and aragonite was increased by addingthc seed cryst.al nf itself.d cryst.al nf itself.

• The Journal of Dong Guk Oriental Medicine
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• v.8 no.1
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• pp.77-91
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• 1999

After allergic contact dermatitis elicitated by Dinitrochlorobenzene(DNCB) treatment, ICR female mice administered Yunkyopaedocksangamibang(YPGM) extract were observed to investigate the effect of YPGM on allergic contact dermatitis. This study investigated that contact hypersensitivity assay, abdominal skin morphologic changes including mast cells. At contact hypersensitivity assay, the right ear swelling in YPGM group were probability decreased than DNCB group. At observation of abdominal skin morphologic change, the infiltration of lymphocyte, lymphocyte insertion to epithelium, enlarged capillary, angiogenesis, and damages of epithelium as cytoplasmic vacuolation and enlarge of inter cellular space in YPGM were diminished than DNCB group. The number of mast cell was increased both DNCB and YPGM group. The shape of mast cell in DNCB group was mainly appeared degranulated type, but granulated type in YPGM group. The number of serotonin positive cell was increased both DNCB and YPGM group. The shape of serotonin positive cell in DNCB group was mainly appeared degranulated type, but granulated type in YPGM group. As results indicated that the YPGM extract administration work on the mitigation of skin damages in mouse with allergic contact dermatitis.

• Journal of Oral Medicine and Pain
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• v.30 no.1
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• pp.87-106
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• 2005

In order to evaluate the mechanism of transmission as well as processing of sensory information originating from low-threshold mechanoreceptor in oral and maxillofacial region at primary synaptic region of trigeminal nervous system, vibrissa afferent fibers of adult cat were labeled with intra-axonal HRP injection. Serial sections containing labeled boutons were obtained from the piece of trigeminal interpolar nucleus. Under electron microscope, total 30 labeled boutons were observed, and ultrastructural characteristics, frequency of occurence, synaptic organizations of vibrissa afferent terminals were analysed. The results were as follows: 1. Labeled boutons contained clear, spherical synaptic vesicles with diameter of 45$\sim$55nm. They formed asymmetrical synapse with dendrites showing definite postsynaptic density, larger synaptic cleft, multiple synaptic structures at various regions. With unlabeled axon terminals(p-ending) containing polymorphic synaptic vesicles, they formed symmetrical synapse showing indefinite postsynaptic density and narrower synaptic area. 2. Each labeled bouton formed 1 to 15 synapses, the average of 4.77$\pm$3.37 contacts per labeled bouton, with adjacent neuronal profiles. Relatively complex synaptic organization, which formed synapses with more than 5 neuronal profiles, was observed in a large number(46.7%, n=14) of labeled boutons. 3. Axo-somatic synapse was not observed. The number of axo-dendritic synapse was 1.83$\pm$1.37 per labeled bouton. Majority(85.0%) of axo-dendritic synapses were formed with dendritic shafts, nonprimary dendrites(n=47, 1.57$\pm$1.38/1 bouton), however, synapses formed with primary dendrites(n=6, 0.20$\pm$0.41/1 bouton) or dendritic spines(n=2, 0.07$\pm$0.25/1 bouton) were rare. 4. 76.7%(n=23) of labeled boutons formed axo-axonic synapse (2.93$\pm$2.36/1 bouton) with p-endings containing pleomorphic vesicles. Synaptic triad, in which p-endings formed synapses with labeled boutons and dendrites adjacent to the labeled boutons simultaneoulsy, were also observed in 60.0%(n=18) of labeled boutons. From the above results, vibrissa afferent terminals of adult cat showed distinctive synaptic organization in the trigeminal interpolar nucleus, thus, suggests their correlation with the function of the trigeminal interpolaris nucleus, which participates in processing of complex sensory information such as two-point discrimination and motivational-affective action. Further studies on physiologic functions such as quantitative analysis on ultrastructures of afferent terminals and nerve transmitters participating in presynaptic inhibition are required.

• Journal of Oral Medicine and Pain
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• v.31 no.3
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• pp.265-274
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• 2006

Temporomandibular joint (TMJ) internal derangement, especially disc displacement with reduction (DDwR) is the most common TMJ arthropathy and has been thought to do some effects on masticatory performance. Measuring of maximal bite force has been widely used as objective and quantitative method of evaluating masticatory performance, but previous studies showed various results due to various characteristics of subjects and different measuring devices and techniques. In a few studies about the correlation of bite force and temporomandibular disorders (TMD), some authors reported that bite force and masticatory performance would be reduced in patients with TMD because of pain. But the correlation of changes in structure of articular disc and masticatory performance has not been well investigated yet. In this study, to investigate the influences of non-painful disc change on the masticatory performance, we measured the value of maximal bite force, occlusal contact area and occlusal pressure of 39 patients with non-painful DDwR of the TMJ using pressure sensitive film, and compared it with that of 59 controls. The results are summarized as follows: 1. The maximal bite force (P<0.01) and the occlusal contact area (P < 0.05) of the DDwR patients were greater than the controls. 2. There was no significant difference in occlusal pressure between the DDwR patients and the controls (P > 0.05). 3. The maximal bite force of the male group was greater than that of the female group (P < 0.05). However, the occlusal contact area and the occlusal pressure between the male and the female group didn't show significant difference (P > 0.05). From the results above, we can suggest that DDwR could be a factor of changing bite force, but more controlled, large scaled and EMG related further study is needed.

• Korean Journal of Ichthyology
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• v.18 no.3
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• pp.223-233
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• 2006

The annual and spatial changes in the species composition of catch off Yeosu were analyzed using the daily sales slip catch data by a set net in the inshore waters off Dolsan Islands in Yeosu from April to October 2001, off Yeon Islands of Yeosu from April to October 2002 and in the offshore waters off Dolsan Islands of Yeosu from April to December 2003, respectively. Scomberomorus niphonius, Seriola spp., Trichiurus lepturus, Engraulis japonicus, Sarda orientalis, Todarodes pacificus, Pampus echinogaster, Sardinella zunasi, Scomber japonicus, Lophius litulon and Loligo beka were dominant species in abundance, indicating that pelagic fish were mainly caught by a set net off Yeosu. S. zunasi, P. echinogaster, Platycephalus indicus and L. beka inhabited mainly in the inshore waters, and S. niphonius, Seriola spp., T. lepturus, P. echinogaster, T. pacificus, Takifugu porphyreus and Pagrus major resided mainly in the offshore waters as the pelagic resident species. E. japonicus was a representative dominant species moving between the inshore and the offshore waters seasonally. S. zunasi and E. japonicus occurred in the inshore waters, and E. japonicus, L. litulon and Seriola spp. begain to be caught in the deep offshore waters in spring. Total catch was high during the summer season by migration of the open sea species such as T. lepturus, S. niphonius, S. japonicus, Seriola spp., S. orientalis, P. echinogaster and T. pacificus. In fall, S. niphonius, E. japonicus, Sphyraena pinguis, Siganus fuscescens and Leiognathus nuchalis were dominant in the inshore waters, and S. niphonius, P. echinogaster, Hyporhamphus sajori, S. japonicus and T. lepturus continued to occur from summer in the offshore waters but total catch decreased, indicating the typical seasonal variation pattern of the temperate region. Most of catchable fishes by a set net were the pelagic species showing a significant temporal variation. Collection and analysis of daily catch data by large set nets can be used to determine seasonal variation in species composition of pelagic fish in a study area.