• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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• pp.516-516
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• 2002

With the wide usage of LiDAR data and high-resolution satellite image, 3D modeling of buildings in urban areas has become an important research topic in the photogrammetry and computer vision field for many years. However the previous modeling has its limitations of merely texturing the image to the DSM surface of the study area and does not represent the relief of building surfaces. This study is focused on presenting a system of realistic 3D building modeling from consecutive stereo image sequences using digital camera. Generally when acquiring images through camera, various parameters such as zooming, focus, and attitude are necessary to extract accurate results, which in certain cases, some parameters have to be rectified. It is, however, not always possible or practical to precisely estimate or rectify the information of camera positions or attitudes. In this research, we constructed the collinearity condition of stereo images through extracting the distinctive points from stereo image sequence. In addition, we executed image matching with Graph Cut method, which has a very high accuracy. This system successfully performed the realistic modeling of building with a good visual quality. From the study, we concluded that 3D building modeling of city area could be acquired more realistically.

• 한국재료학회지
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• 제28권10호
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• pp.583-589
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• 2018

This study investigates the effect of fatigue stress on the damping capacity in a damaged Fe-22Mn-12Cr-3Ni-2Si-4Co damping alloy under fatigue stress. ${\alpha}^{\prime}$ and ${\varepsilon}-martensite$ forms by fatigue stress in the damaged Fe-22Mn-12Cr-3Ni-2Si4-Co damping alloy under fatigue stress. The ${\alpha}^{\prime}$ and ${\varepsilon}-martensite$ forms with the specific direction and surface relief, or they cross each other. With an increasing fatigue stress, the volume fraction of ${\alpha}^{\prime}-martensite$ and ${\varepsilon}-martensite$ increases. With an increasing fatigue stress, the damping capacity increases with an increase in the volume fraction of ${\varepsilon}-martensite$. The increase in the damping capacity in the damaged Fe-22Mn-12Cr-3Ni-2Si-4Co alloy under fatigue stress strongly affects the increase of ${\varepsilon}-martensite$ formed by fatigue stress, but the damping capacity of the damaged Fe-22Mn-12Cr-3Ni-2Si-4Co damping alloy under fatigue stress is strongly controlled by a large amount of ${\alpha}^{\prime}-martensite$.

• 대한기계학회논문집
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• 제9권1호
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• pp.40-46
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• 1985

본 연구에서는 제 1보에 밝힌 바 있는 용접 HAZ조직의 파괴인성에 영향을 주 는 PWHT 유지시간과 가열속도에 이어, 용접 HAZ의 불안정포성파괴에 미치는 용접잔유 응력의 영향을 상세히 밝히기 위하여 일층 용접을 실시하고, 이 용접재의 용접HAZ에 단축상태의 일정한 응력을 작용시켜 주면서 소정의 열처리를 실시함으로써 용접후 열 처리시 용접HAZ에 작용된 응력의 크기가 파괴인성에 어떠한 영향을 미치는지를 COD파 괴인성시험, 미소경도시험, 파면관찰을 통하여 고찰하고자 한다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
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• pp.326-326
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• 2014

It has been known since the mid 1960s that Ag can be photodissolved in chalcogenide glasses to form materials with interesting technological properties. In the 40 years since, this effect has been used in diverse applications such as the fabrication of relief images in optical elements, micro photolithographic schemes, and for direct imaging by photoinduced Ag surface deposition. ReRAM, also known as conductive bridging RAM (CBRAM), is a resistive switching memory based on non-volatile formation and dissolution of a conductive filament in a solid electrolyte. Especially, Ag-doped chalcogenide glasses and thin films have become attractive materials for fundamental research of their structure, properties, and preparation. Ag-doped chalcogenide glasses have been used in the formation of solid electrolyte which is the active medium in ReRAM devices. In this paper, we investigated the nature of thin films formed by the photo-dissolution of Ag into Ge-Se glasses for use in ReRAM devices. These devices rely on ion transport in the film so produced to create electrically programmable resistance states [1-3]. We have demonstrated functionalities of Ag doped chalcogenide glasses based on their capabilities as solid electrolytes. Formation of such amorphous systems by the introduction of Ag+ ions photo-induced diffusion in thin chalcogenide films is considered. The influence of Ag+ ions is regarded in terms of diffusion kinetics and Ag saturation is related to the composition of the hosting material. Saturated Ag+ ions have been used in the formation of conductive filaments at the solid electrolyte which is the active medium in ReRAM devices. Following fabrication, the cell displays a metal-insulator-metal structure. We measured the I-V characteristics of a cell, similar results were obtained with different via sizes, due to the filamentary nature of resistance switching in ReRAM cell. As the voltage is swept from 0 V to a positive top electrode voltage, the device switches from a high resistive to a low resistive, or set. The low conducting, or reset, state can be restored by means of a negative voltage sweep where the switch-off of the device usually occurs.

• 대한공간정보학회지
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• 제4권2호
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• pp.195-203
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• 1996

노선계획 및 선정시 지형의 입체적 분석은 정책입안의 효율적인 판단을 내리는데 중요한 기초자료로 사용된다. 본 연구는 수치지형자료를 이용하여 지형을 모형화, 분석 및 재현함으로써 대상지역내의 진입노선 및 설계교량에 대한 선형을 효율적으로 결정하고자 하였다. 연구대상지역에 대한 등고선도, 불규칙삼각망도, 격자망도와 같은 수치지형모형을 바탕으로 사면경사도, 경사방향도, 음영기복도, 시정선도 및 유하선도를 분석하였다. 또한 절. 성토량을 산정하고 유토목선을 도시함으로써 도로공사를 위한 토공량을 예측할 수 있었으며 도로와 지형의 모의관측으로 시공후의 경관을 파악할 수 있었다. 이와 같이 입체적 지형자료의 시각적 효과는 계획가와 의사결정자가 대상지역의 지형적 특성을 고려하여 대안노선을 선정 및 검토하는데 효과적임을 제시할 수 있었다.

• The Korean Journal of Pain
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• 제12권1호
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• pp.114-118
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• 1999

Backgrouds: Cervical epidural blocks were used as part of a comprehensive multimodal treatment program for patients with chronic pain in the head, neck and upper extremities. The depth of the epidural space beneth the skin surface varies at different levels of the spinal column in the same patient. It also varies from patient to patient at the same vertebral level. We studied the distance the skin to the cervical epidural space in adults patients at different intervertebral spaces. Methods: Date were gathered from 628 patients having cervical epidural block for relief of cervical and upper extrimity pain. All blocks were performed using hanging drop method after loss of resistance with saline at C5-6, C6-7, C7-T1 intervertebral space. Results: Mean distances for skin to cervical epidural space (DSES) were 5.42 cm, 5.06 cm, 4.68 cm in male, 5.00 cm, 4.61 cm, 4.10 cm in female at C7-T1, C6-7, C5-6 intervertebral space. DSES correlated with body weight, neck circumference and body mass index significantly. Conclusion: In the cervical spine, DSES varies from space to space. The longest DSES were noted at C7-T1 level in male, and the shortest DSES were at C5-6 in female. DSES has significant relationships with weight, neck circumference and body mass index.

• 한국재료학회지
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• 제23권1호
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• pp.18-23
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• 2013

In this study, the effects of cryogenic treatment cycles on the residual stress and mechanical properties of 7075 aluminum alloy (Al7075) samples, in the form of a tube-shaped product with a diameter of 500 nm, were investigated. Samples were first subjected to solution treatment at $470^{\circ}C$, followed by cryogenic treatment and aging treatment. The residual stress and mechanical properties of the samples were systematically characterized. Residual stress was measured with a cutting method using strain gauges attached on the surface of the samples; in addition, tensile strength and Vickers hardness tests were performed. The detailed microstructure of the samples was investigated by transmission electron microscopy. Results showed that samples with 85 % relief in residual stress and 8% increase in tensile strength were achieved after undergoing three cycles of cryogenic treatments; this is in contrast to the samples processed by conventional solution treatment and natural aging (T4). The major reasons for the smaller residual stress and relatively high tensile strength for the samples fabricated by cryogenic treatment are the formation of very small-sized precipitates and the relaxation of residual stress during the low temperature process in uphill quenching. In addition, samples subjected to three cycles of cryogenic treatment demonstrated much lower residual stress than, and similar tensile strength compared to, those samples subjected to one cycle of cryogenic treatment or artificial aging treatment.

• 디자인학연구
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• 제15권2호
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• pp.71-80
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• 2002

현대의 포스터에에서는 눈의 착각과 트릭을 이용한 표현을 볼 수 있다. 본 연구에서는 포스터에서 볼 수 있는 이러한 개성적 표현을 $\ulcorner$착시적(錯視的)$\lrcorner$이라고 하는 개념으로 파악하였다. 이러한 개념은 현대 그래픽 디자인의 하나의 경향적 표현으로써 부조화(浮彫化)될 것이라고 생각된다 그러나 그것에는 심리학의 $\ulcorner$착시$\lrcorner$ 보다도 넓은 정의와 개념이 필요하다. 현대 포스터에서 볼 수 있는 착시적 표현을 통일화하기 위해서 새로운 $\ulcorner$착시$\lrcorner$의 정의를 시도해 봄으로써 현대 포스터에 영향을 준 과거의 시각예술을 살펴보았다 그 결과 착시적 표현에 대한 관심도는 서구의 여러 나라에서 더욱 많이 있었음을 알수 있었다. 착시를 역사적으로 거슬러 올라가면 르네상스의 원근법을 시작하여 15세기 이후의 유럽에서 유행한 속임수 그림, 알친볼드(Arzhibauld)의 회화, 아나몰포즈(anamolphoses) 등에 귀착되며, 근대와 현대에서는 슈르리얼리즘(surrealism)과 에셔(Escher)의 작품 등이 있다. 이 작품들은 현대 포스터에 많은 영향을 주고 있다는 것을 알았다.

• 항공우주정책ㆍ법학회지
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• 제24권1호
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• pp.3-35
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• 2009

항공범죄의 개념에는 민간 항공의 안전을 위해하는 행위, 항공기 불법납치 그리고 불법 파괴행위 등이 포함된다. 이러한 항공범죄는 주로 ICAO에서 국제 조약 및 협약으로 규정하고 있다. 아래의 조약과 협약은 모든 국가에 적용되는 무조건적이고 절대적인 규범이다. 항공기내에서 행한 범죄 및 기타 행위에 관한 협약(Convention on Offences and Certain other Acts Committed on Board Aircraft), 항공기의 불법납치 억제를 위한 협약(Convention for the Suppression of Unlawful Seizure of Aircraft, Convention for the suppression of unlawful acts against the safety of civil aviation), 공항에서의 불법적 폭력행위의 억제를 위한 의정서(Protocol for the Suppression of Unlawful Acts of Violence at Airports Serving International Civil Aviation), 가소성 폭약의 탐지용 표지에 관한 협약(Convention on the Marking of Plastic Explosives for the Purpose of Detection) 본 논문에서는 상기 조약에서 언급하고 있는 항공범죄의 의미와 재판관할에 대한 내용을 살펴본다. 또한 항공범죄가 비행중이거나 지상에서 발생하였을 경우의 사후구제수단에 대하여 설명한다. 마지막으로 항공범죄와 관련된 사례들을 통해 피해자를 보호할 수 있는 방안을 고찰한다.

• The Korean Journal of Pain
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• 제7권1호
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• pp.74-77
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• 1994

통증치료 목적으로 구입한 본 HI-TECH 50으로 급만성 피부창상에 조사한 결과 통증완화 뿐만 아니라 창상치유에 좋은 성과를 얻었다. 특히 고질적 만성 당뇨병성 피부궤양같이 보존적 치료법으로 극히 치유가 어려운 경우에 레이저 광선을 조사함으로 해서 육아조직의 활성화는 물론이고 진통효과와 피부이식의 성공율도 현저히 향상되었음을 관찰하였다.