• Proceedings of the Mineralogical Society of Korea Conference
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• 2001.06a
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• pp.58-59
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• 2001

부산에서 북동쪽으로 대략 25km 떨어진 지점에 위치하고 있는 일광광산 부근의 지질은 백악기 화산암ㆍ퇴적암 그리고 이를 관입한 화강암류와 이 암주 내에 발달하는 구리-중석을 함유하고 있는 각력파이프광상으로 이루어져 있다. 일광광산의 화강암류는 거의 타원형으로 felsic한 중앙부와 mafic한 양상의 주변부로 나뉘어지며, 암주 내에 수직적인 원통형의 각력파이프가 광화대를 이루고 있고, 그 주변에는 모암변질대가 발달되어 있다. 각력파이프를 충진하고 있는 vein과 화강암의 중앙부에는 전기석이 풍부하게 산출되고 있다. 일광광산에서 산출되는 전기석은 야외 관찰시 각력파이프 중심에서부터 외곽부쪽으로 전기석의 풍부함이 감소하며 산출형태도 달라진다. 파이프에서 대략반경 150m내에서 전기석은 침상형 의 방사상 모양 내지 rosettes형으로 풍부하게 산출되며, 화강암내의 mafic한 암편을 치환한 형태로 산출되기도 한다. 암주의 중앙부 주변부에서는 거의 미세한 구상형으로 산재되어 나타나고 있다. 전기석은 복잡한 화학식 {(Na, Ca)(Fe, Mg)$_3$(Al, Li)$_{6}$(BO$_3$)$_3$Si$_{6}$O$_{18}$ (OH, F)$_4$}을 갖는 붕산 규산염광물이다. 이러 한 다양한 성분은 마그마의 진화과정, 모암의 특성, 온도, 압력, 성분과 같은 물리ㆍ화학적 성질에 따라 전기석의 성분이 체계적으로 변하기 때문에 모암과 전기석 기원과의 상관관계를 파악할 수 있다. 파이프 부근의 화강암류는 현미 경상에서 전기석이 석류석과 같이 풍부하게 나타나며 장석들은 변질받은 상태로 세리사이트, 녹렴석으로 나타나고, 흑운모와 각섬석은 녹니석화되어 변질된 상태를 보이고 있다. 파이프 중심에서 외곽부로 갈수록 전기석의 함량은 줄어들고 있고 장석들이 알바이트ㆍ칼스베드 쌍정을 보이며, 흑운모가 각섬석보다는 우세하게 나타나고 있다. 전기석은 주상 결정, 자형 내지 반자형의 입자로 다색성을 보이며, 결정 중심에서 가장자리로 갈수록 파란색과 황갈색의 광학적 누대구조를 관찰할 수 있다. 일광광산에서 산출되는 전기석에 대한 현미경 관찰은 열수기원임을 지시하고 있다. 야외조사와 현미경 관찰의 예비조사에 의하면 일광광산의 전기석이 형성된 환경은 다른2가지 화학적인 저장소의 혼합 효과의 결과로 생성되어진 것으로 예상된다. 일광의 화강암류를 만든 마그마는 전기석을 형성할 만큼의 Fe-Mg성분이 충분하지 않았을 것이다. 화강암 내에 흑운모와 각섬석의 결정작용에 의해 마그마의 Fe-Mg성분이 고갈되어지고 이로 인해 그 함량이 감소하며 상대적으로 마그마 내에 남은 붕소(B$_2$O$_3$)는 열수로 용리되고 흑운모, 각섬석과 평형을 유지하며 열수에 남아있게 된다. 잔류용융체에 남은 붕소의 함량은 전기석을 만들기에 충분함에도 불구하고, Fe-Mg 함량이 부족하여 마그마 기원의 전기석 결정을 만들 수가 없다가 광맥이 형성된 시기에 또 다른 열수가 공급되면서 이전의 평형이 깨지고 기존의 흑운모와 같은 염기성 광물이 붕소(B)를 함유한 새로운 열수와 반응하여 전기석을 형성한 것으로 예상한다. 앞으로 전암과 광물에 대해 지화학적 연구를 통해 화강암류와 전기석과의 지화학적 연관성, 주성분 원소와 열수의 특성과의 상관관계, 전기석의 기원(마그마 기원인지 열수기원인지)이 보다 정확하게 파악될 것이다. 마그마 진화에 따른 전기석의 성분변화와 기원을 이용하여 일광광산의 동광화대를 형성한 마그마 계에서 열수계로 이어지는 지질학적 과정을 이해할 수 있을 것이며, 암석 성인론적 지시자로서 어떠한 중요성을 갖는지 논의되어질 수 있다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2011.11a
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• pp.926-928
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• 2011

Material used in aerospace field is exposed in high temperature environments, and the required important factors of material is high strength and low weight. These conditions are satisfying material, as in the titanium alloy has been used mainly. In this paper, Cone shaped brackets that attach to the case, in order to avoid the difficulty of welding position, sheet attached to the brackets welded on, then the way Cone is proposed. Existing methods and proposed method of analysis under the same conditions through thermal stress and structural analysis adequacy of the proposed bracket types were analyzed. The program was used to analysis the ABAQUS/CAE.

• Journal of Advanced Marine Engineering and Technology
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• v.36 no.1
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• pp.72-77
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• 2012

An alternative fuel is introduced as an environmentally friendly fuel in order to reduce the toxic emissions from conventional fossil fuels. In this study a bio-diesel fuel is produced and applied into the industrial diesel engine to understand the effect on the performance. The test conditions are loads of idle to maximum torque and engine speeds of 700 to 1900 rpm in bio-diesel blending percents of 0, 10, 20%. The results show that smoke and CO emissions are reduced while NOx in slightly increased, and the effects are rather clear in higher loads.

• Solar Energy
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• v.18 no.3
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• pp.41-50
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• 1998

The purpose of this study is to analyze the energy consumption status for various building types in Taejon. 35 sample buildings were classified into 8 building types, i.e., sports center & swimming pools, hotels, telecommunication exchange service facility, hospitals, research laboratories, department stores, exhibition galleries, universities. According to analyses, energy consumption patterns varies significantly for each building type. Sports centers consumes highest rate(689 $Mcal/sqm{\cdot}yr$) and universities lowest rate(86 $Mcal/sqm{\cdot}yr$) among selected building types.

• Proceedings of the Korea Information Processing Society Conference
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• 2020.11a
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• pp.251-254
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• 2020

매년 1인 가구를 대상으로 한 범죄가 증가하고 있다. 이에 따라 지문인식, 스마트키와 같은 도어록 제품들이 출시되었지만 오히려 범죄에 악용되는 사례들이 발생하였다. 본 논문에서는 얼굴인식장치(face identifier, FI)를 통해 객체를 인식하고, 원격 도어록 관리자(remote door lock manager, RDM)를 통해 잠금제어부(locking control unit, LCU)를 관리하는 긴급 상황 인식 스마트 도어록을 제안한다. 사용자의 얼굴을 얼마나 빠르고 정확하게 인식하는지 속도와 신뢰도에 대한 테스트를 진행하였고, 긴급 상황 시 사용자가 안전하게 집으로 들어갈 수 있음을 확인하였다. 본 제품을 통해 주거 침입, 스토킹 등 1인 가구 대상 범죄율과 도어록 악용 범죄율이 낮아질 것으로 사료된다.

• Korean Journal of Agricultural Science
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• v.13 no.1
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• pp.44-51
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• 1986

A total number of 916 fruiting bodies of Ganoderma lucidum (Fr.) Karsten grown naturally in Korea were collected to investigate the morphological characters and some other useful characters related to the quality of the fungus and the results obtained are summarized as follows; The host tree showing the highest parasitic rate by the Genoderma lucidum(Fr.) Karsten was oak tree and the parasitic rate of the tree was 86.2%. The order of parasitic rate of the host trees by the fungus next to the oak was peach, chestnut, persimmon and acasia. The size, shape and color of fruiting bodies were varied according to the host trees. The average size of fruiting bodies collected was 40 to 100 mm by 30 to 80mm. The fruiting bodies with pileus size of 60 by 45 mm, pileus thickness of over 10mm, pileus minor axis/stipe length ratio of over 0.65 and pileus thickness/pileus minor axis ratio of over 0.22 were considered having higher commerical values. The external shape of the fruiting body was very important criterion to evaluate the quality of the Ganoderma lucidum (Fr.) Karsten. A great variation in characters such as pileus shape, color, marginal shape, zonation of pileus, pileus thickness, poroid layer of fruiting bodies and shape of stipe were observed from the fruiting bodies of G. lucidum collected in Korea. Further studies will be necessary for the genetic nature of these characters.

• Korean Journal of Environment and Ecology
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• v.22 no.6
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• pp.616-624
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• 2008

The ichthyofauna and ecological community analysis in the Dong River, Korea, were investigated from May, 2006 to May, 2007. During the surveyed period, 31 species belonging 9 families were collected. Total of 31 species(primary freshwater: 26 species, peripheral freshwater: 5 species) were found with the primary freshwater fishes being highest. Dominant species was Zacco koreanus(55.73%), and subdominant species was Coreoleuciscus splendidus(7.15%). Also, Microphysogobio longidorsalis (6.12%), Hemibarbus mylodon(4.87%), Iksookimia koreensis(4.49%) were numerous. There were 19 Korean endemic species(61.29%), including Acheilognathus signifer, A. yamatsutae, Pseudopungtungia tenuicorpus, C. splendidus, Squalidus gracilis majimae, H. mylodon. Among them, 1 species was identified as qualifying for possible designation as a natural monument catergory, and 5 species were identified for designation required to protect under a wildlife category. As result of expected number of species according to rarefaction curve, the expected species of the Dong-river ranged from 19(51. 4, 5) to 22(51. 3) and result of similarity analysis ranged from 62.28%(51. 1 and 2) to 84.13%(51. 1 and 5). In conclusions, we could define that the Dong-river has a very good water conditions as habitat of fish, and habitat conditions also are very similar in every survey sites.

• Journal of the Korean Institute of Landscape Architecture
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• v.42 no.1
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• pp.123-132
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• 2014

This study aims to develop the diagnostic evaluation method of the riverine ecobelt for construction, conservation, and maintenance of the riverine ecobelt. The value indices in the proposed evaluation method are composed of total 5 fields and 19 elements. The 5 fields are flood control, environmental function, growth of plants, ecobelt function, and restoration potential. Flood control field is composed of total 3 elements such as length, width, and density of green area. Environmental function field is composed of 4 elements such as park use, landscape boundary and edge, microclimate control, non-point pollution control. Growth of plants field is composed of 6 elements such as species composition, forest height, stratum structure, vine plants, plant vitality, and succession of plants. Ecobelt function field is composed of 4 elements such as longitudinal connectivity, lateral connectivity, in-stream forest or habitat, roads on bank top. Restoration potential field is composed of 2 elements such as landform and land use of the immediate vicinity. The score system ranging 1~4 was adopted. The weighting parameters of elements were unified with each other. The final grade system ranging 1~5(1: very good~5: very bad) was adopted, and the final grade was evaluated by the mean values of each field. According to the test application of the diagnostic evaluation method of the riverine ecobelt, the final grades showed effectively the real condition of each site.

• The Korean Journal of Ecology
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• v.24 no.5
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• pp.309-313
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• 2001

This research was conducted to test cadmium tolerance by five speices of native herbs for screening cadmium tolerance plant. We examined germination rate, root and shoot growth rate of seedling, fresh biomass of native herbs exposed to cadmium solution for 14 days. Especially, germination rate of Abutilon avicennae and Amaranthus retroflexus was over 90% in all concentration, but germination rate of Aeschynomene indica, Echinochloa crus-galli var. oryzicola and Echinochla crus-galli var. frumentacea began to decrease when they exposed to 15 mgCdSO₄ /L. The higher the Cd concentration, the length of root, shoot grew lower. The fresh biomass of Echinochloa crus-galli var. oryzicola, Echinochla crus-galli var. frumentacea and Amaranthus retro-flexus were not so different from each control, but those of Abutilon avicennae and Aeschynomene indica began to decrese greatly when exposed to 60 mgCdSO₄ /L. EC/sub 50/(Effective Concentration 50%) of Abutilon avicennae, Aeschynomene indica and Amaranthus retroflexus was 44.6∼77.5 mgCdSO₄ /L for root growth, 38.6∼114 mgCdSO₄ /L for shoot growth, 60∼107.5 mgCdSO₄ /L for fresh biomass. Among the native herbs, sensitivity of cadmium ordered as root length > fresh biomass > shoot length. These results indicate that Abutilon avicennae is a tolerant species for cadmium.

• Korean Journal of Environment and Ecology
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• v.1 no.1
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• pp.35-45
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• 1987

To survey trail damage and vegetational change around trail at Bukhan Mountain National Park in Korea, field survey was executed over Bukhan mountain district during August, 1987. Trail damage was surveyed for he section of 7.18km from Ui valley to Jeongnung valley in which user's density was high. Ground vegetation was surveyed with a belt-transect method from trail edge to forest and edge species were surveyed with a belt method along trail edge. Interrelation between trail damage and user's density was not dear. Damage class II of trail showed 23.9% of the surveyed section and class III showed 8.0% and class II and III of natural trail showed 19.7% and those of facilitated trail showed 12.3%. The length of damage class II and III requiring readjustment were estimated as 3.65 km and 1.22km from the main trail course of 15.3km at Bukhan mountain district. In case of no intervention to forest by users, vegetational change around trails was appeared up to 6-8 m from trailside. But in case of intervention to forest by users, vegetational change was not coincident with the change of soil hardness and was diverse locally. Quercus mongolica, Lespedeza cyrtobotrya and Rbo-dodendron mucronulatum were appeared as Raunkiaer frequency class E, and Weigela subsessilis. Lespedeza maximowiczii, Rhododendron schlippenbachii and Sorbus alnifolid were appeared as class D at trail edge of ridge-Quercus mongolica was appeared as class E and Rhododenderon mucrounulatium. Stephanandra incisa were appeared as class D at trail edge of midslope. Rhododenron mucronulatum. Lespedeza maximowiczii and Stepanandra incisa were appeared as class D at trail edge of valley. Lespedeza cyrtobotrya. Lespedeza maximowiczii and Stephanandra incisa were appeared as class D at trail edge of valley beside motorway.