• 자원환경지질
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• 제2권3호
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• pp.58-67
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• 1969

Songgwang lead zinc mine is located in about 12km to the north-east of Jeonju City. Geology of the mine and its visinity is consisted of Jeonju series belonged to so-called Okcheon system, Seodaesan tuff formation, Silla series, and the quartz porphyry intruded into these formations. Jeonju series comprising 3 formations; that is, of Sadaeri, Sindong, and Girinbong. Jeonju series is generally distributed in southern part of the area, striking NNW, and diping NE $30^{\circ}$, or NW $30^{\circ}$. It is deformed to form synclinorium and anticlinorium plunging to the north with low angle. In the northern part of the area, Jeonju series was cut by Sinpeongri-fault of NEE direction near Sinpeongri. In the north side of the fault, it is overturned and shows NEE or NWW strikes and NW $60^{\circ}$ dips. At the west of Songgwangri, it is cut by 3 thrusts; the two are almost parallel each other, and the third oneis manifested by the fact that the lower black shale zone thrusted over the upper limestone. Songgwangri thrust, so named, is a post-mineral fault and its plane represents a premineral slip plane. Enrichment of are took place along the bedding plane or fissure parallel to it, as seen in adit No. 1 or No. 2 along the floor of the thrust, and along the sheared zone or the brecciated zone oblique to the plane near the thrust in crystalline limestone of Sindong formation as observed in the underground levels of inclined slope. Ore minerals are chiefly zincblende, galena, pyrrhotite, arsenopyrite, acompanied pyrite and chalcopyrite, and contain Au and Ag. In earlier stage of mineralization, the limestone was recrystalized, and sulphide minerals were enriched in the· permiable zone said above by pyrometasomatism, and in later stage the limestone was affected chloritization and sericitization. However hydrothermal replacement was weak, so that enrichment did not took place. It seems that minerallizing materials came up through the premineral slip plane and injected, and replaced the limestone in permiable zone said above with sulphide are minerals. Then Songgwangri thrust took place and, the lower black shale zone thrusted upon crystalline limestone.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2000년도 Proceeding of International Symposium NAVAIDS 2001
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• pp.31-311
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• 2000

No Abstract.See Full-text

• 플랜트 저널
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• 제6권3호
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• pp.12-23
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• 2010

• Journal of Oral Medicine and Pain
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• 제21권1호
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• pp.55-65
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• 1996

This study was performed to investigate the effects of head posture and occlusal splint on the vertical dimension in mandibular rest position and swallowing. Thirty health dental students ware selected lot this study and BioEGNⓡ(Bioresearch Inc., USA) was used for measuring interocclusal distance during rest - swallowing - rest - tapping movement. This swallowing movements were observed in both normal head posture(NHP) and forward head posture (FHP). Thickness of occlusal splint was about 2mm at posterior molar area and even tooth contact were achieved on light biting. The four mandibular positions at which interocclusal distance measured were swallowing position, after swallowing position in which interocclusal distance was maximum, rest position follows swallowing, and tapping position after rest. Changes of distance in each position were measured for three mandibular planes, that is, sagittal, frontal, and horizontal plane, respectively. The results obtained were as follows : 1. In normal head posture, the mandible was raised 1.03mm without splint, and 0.77mm with splint on swallowing, and there was no significant difference between the two. In horizontal plane, however, mandible was displaced more anteriorly in both swallowing position and tapping position with splint. 2. In forward head posture, the mandible was less raised with splint on swallowing, but features in horizontal plane were almost same as those in normal head posture. 3. In natural dentition, significant difference between NHP and FHP were observed in horizontal plane trajectory for swallowing and tapping position. But the difference for same positions were observed in frontal trajectory with splint. 4. Total amount of mandibular movement of two groups classified with sagittal interocclusal distance of swallowing position generally showed significant difference between the higher and the lower height group in head posture without splint. 5. Correlationship among total amount of mandibular movement for three mandibular planes were observed between sagittal plane and horizontal plane, and between sagittal plane and frontal plane in head posture without splint.

• 디지털융복합연구
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• 제14권11호
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• pp.319-324
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• 2016

실내에서 카메라를 이용한 로봇 응용이나 가상현실(Virtual Reality) 응용의 경우 평면을 찾고 추정하는 기술은 매우 중요한 기술이다. RGB-D 카메라의 경우 실내의 평면에서 질감 정보가 없는 평면에서도 3차원 관측 데이터를 얻을 수 있지만, 이미지 영역에서 점군 데이터(Point-cloud Data)를 처리하기 위해서는 많은 연산량이 필요하다. 더군다나 현재 관측되고 있는 평면의 개수가 몇 개인지 미리 알 수 없으며, 평면으로 검출(Plane Detection) 하더라도 강인하게 3차원에서 평면을 추정(Plane Estimation)하려면 추가적인 연산이 필요하다. 본 논문에서는 연속 데이터를 이용해 실시간으로 평면의 개수를 선택하며 평면을 추정하는 방법을 제시하고자 한다. 실험 결과를 통해 제안하는 방법이 전체 데이터를 처리하는 것에 비해 약 22배의 속도 개선을 가져 올 수 있음을 보였다.

• 한국환경생태학회지
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• 제21권6호
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• pp.559-564
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• 2007

원주 성남리 성황림(척연기념물 제 93호)에서 보호철책의 설치 이후 노거수의 치수들이 어느 정도 생육하는가에 대한 조사를 통하여 성황림의 생태적 변화를 밝히고자 조사한 결과 다음과 같은 결과를 얻었다. 1989년 보호철책의 설치로 사람들의 출입을 통제한 결과 평지림의 토양강도(토양견밀도)는 도로로 이용되었던 부분을 제외하고는 크게 완화되었다. 피해도 2, 3, 4로 지피식생이 없었던 평지림에서 1,202개체의 치수가 자라고 있어 가장 많았고, 피해도 1인 지역에서 565개체, 피해가 없었던 사면림에서는 403개체가 조사되었다. 수고 2m 이상의 유목단계인 치수들은 피해도 1인 지역에서 48개체로 가장 많았고, 피해도 2, 3, 4인 지역에서는 31개체, 피해가 없었던 사면림에서는 $400m^2$의 면적에 14개체로 조사되었다 교목의 치수들은 피해도 2, 3, 4로 지피식생이 거의 없었던 평지림에서 느릅나무, 복자기가 상대적으로 많았으며, 피해도 1인 평지림에서 귀룽나무, 쪽동백, 피해가 없었던 사면림에서 고로쇠와 당단풍나무가 상대적으로 많았다. 지피식생이 거의 없었던 평지림에서 줄딸기, 복분자딸기, 산딸기, 으름덩굴 등이 먼저 왕성하게 자라고 있으나 교목성 치수들의 생장에 따라 점차 개체수가 줄어들 것으로 기대된다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 추계학술대회 논문집 전기물성,응용부문
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• pp.208-212
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• 2001

In this paper, characteristics of the ac and do flashover voltages in the vertical air gap of a needle-plane, sphere-plane and rod-plane electrode system were investigated when the combustion flames were present near the high-voltage electrode. As the results of an experimental we found that the reduction of flashover voltages characteristics with the vertical distance caused, in comparison with the no-flame case were about 1/3 times when a short sap d=1[cm] and 2[cm] of the ac voltages were applied. Also, flashover voltages characteristics of the do negative polarity under sphere-plane and rod-plane electrode system with the combustion flame were increased about two times than those of the do positive polarity.

• Steel and Composite Structures
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• 제27권1호
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• pp.13-25
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• 2018

The main objective of this study is to develop a dual approach for geometrically nonlinear finite element analysis of plane truss structures. The geometric nonlinearity is considered using the Total Lagrangian formulation. The nonlinear solution is obtained by introducing and minimizing an objective function subjected to displacement-type constraints. The proposed method can fully trace the whole equilibrium path of geometrically nonlinear plane truss structures not only before the limit point but also after it. No stiffness matrix is used in the main approach and the solution is acquired only based on the direct classical stress-strain formulations. As a result, produced errors caused by linearization and approximation of the main equilibrium equation will be eliminated. The suggested algorithm can predict both pre- and post-buckling behavior of the steel plane truss structures as well as any arbitrary point of equilibrium path. In addition, an equilibrium path with multiple limit points and snap-back phenomenon can be followed in this approach. To demonstrate the accuracy, efficiency and robustness of the proposed procedure, numerical results of the suggested approach are compared with theoretical solution, modified arc-length method, and those of reported in the literature.

• 한국정보통신학회논문지
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• 제4권2호
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• pp.365-370
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• 2000

본 논문에서는 접지면의 크기가 안테나의 성능에 미치는 영향을 분석하기 위하여 기존의 프린트형 안테나의 특성 개선 요구에 부응한 안테나를 설계ㆍ제작하여 프린트형 안테나의 접지면의 크기에 따른 특성을 측정, 분석하여 최적의 접지면 크기를 산출하였다. 폴디드 안테나의 특성에 미치는 접지면 효과를 알아보기 위해 동박판을 잘라 기존의 폴디드 슬롯 안테나의 접지면을 확장시켰을 때 임피던스 및 방사 특성의 변화를 조사한 결과 임피던스 특성에는 별로 영향을 주지 않았으나, 방사 특성에는 많은 영향을 미치고 있음을 확인 할 수 있었다. 접지면의 크기를 고려한 엄격한 설계를 위해서는 복잡한 과정을 거쳐야 하지만, 접지면의 효과를 무시할 수 있는 적당한 크기를 산정하여 제작한다면 좀더 간단하게 안테나를 제작할 수 있을 것이다.

• 대한기계학회논문집B
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• 제29권2호
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• pp.214-223
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• 2005

The characteristics of flow on two parallel plane jets was experimentally investigated. The two nozzles each with an aspect ratio of 20 were separated by 6 nozzle widths. Reynolds number based on nozzle width was set to 5,000 by nozzle exit velocity. The particle image velocimetry and pressure transducer were employed to measure turbulent velocity components and mean static pressure, respectively. In case of unventilated parallel plane jets, it was shown that a recirculation zone with sub-atmospheric static pressure was bounded by the inner shear layers of the individual jets and the nozzles plated. There was no recirculation zone in the ventilated parallel plane jets. It was found that the spanwise turbulent intensities of unventilated jets were higher than those of ventilated jets because of the interaction of jets, and the streamwise turbulent intensities of ventilated jets were higher than those of unventilated jets because of the effect of entrainment.