• Journal of the Korea Institute of Information and Communication Engineering
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• v.22 no.6
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• pp.874-880
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• 2018

3D modeling is extensively used in the field of architecture, machinery and contents production such as movies. Modeling is a time-consuming task. In order to compensate for these drawbacks, attempts have recently been made to reduce the production period by applying 3D scanning technology. 3D scanning for small objects can be done directly with laser or optics, but large buildings and sculptures require expensive equipment, which makes it difficult to acquire data directly. In this study, 3D modeling data for a large object is acquired using photometry with using drones to acquire the image data. The maintenance method for uniform spacing between the sculpture and the drone, the measurement method for the flight line were presented. In addition, we presented a production environment that can utilize the obtained 3D point cloud data for animation and a rendered animation result to find ways to make it in various environments.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2008.11a
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• pp.392-392
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• 2008

나노크기의 반도체 물질은 표면적/부피 비와 그 크기에 의해 광학적, 전기적 특성이 크게 영향을 받는다. 나노크기의 반도체 재료 중 ZnO는 3.37eV의 넓은 에너지 밴드갭을 가지고 있으며, 60meV의 큰 엑시톤(exciton) 결합에너지의 특성을 가지고 있어 UV 영역의 소스로서 가장 활용도가 클것으로 예상된다. 1 차원 ZnO 나노구조는 청색과 자외선 발광소자 및 광전자 소자, 화학적 센서로 활용이 가능하다. whisker, nanowires, norods, nanonail, nanoring 등과 같은 ZnO 나노구조의 형태와 크기는 합성장비와 공정조건에 크게 영향을 받고 서로 다른 광 특성 결과를 나타낸다. ZnO 나노구조의 합성을 위해 다양한 금속 촉매를 이용한 기상-액상-고상(VLS)의 성장 메카니즘이 연구되었다. 그러나 이 방법은 촉매로 사용된 금속이 불순물로 작용하는 결점을 가지고 있다. 최근에는 기판위에 아무런 촉매도 사용하지 않은 ZnO 의 합성에 대해 많은 연구가 진행되고 있다. 그러나 촉매없이 합성된 나노구조의 형태와 성장방향은 초기단계에서 불규칙한 원자배열로 인해 합성상태의 제어 (방향, 형상 등)가 매우 어렵다. MOCVD 장비 금속 촉매를 이용하지 않고도 미량의 Zn 와 $O_2$ 량을 일정하게 조절함으로써 형상 및 방향성을 제어 할 수 있다는 장점을 가지고 있다. 또한 본 연구에 사용된 MOCVD 장비의 경우 추가적인 케리어 가스 유입을 통해 나노막대의 aspect ratio 조절이 가능하다. 본 연구는 MOCVD 장비를 이용해 촉매를 사용하지 않고 1 차원 ZnO 나노막대를 합성하였고, 추가적 케리어 가스 유량을 변화시킴으로써 형태 변화 및 발광특성에 관한 영향을 연구하였다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.06a
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• pp.420-420
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• 2007

ZnO 나노막대는 산화물 반도체로서 넓은 밴드캡 (3.37eV)을 가진 반도체이며, 테라급의 전계 효과 트랜지스터(FET), 대기오염물질 모니터링 센서, 태앙전지용 전극, UV 발광소자, 전계방출 디스플레이의 팀 등 나노기술 전반에 활용해 최근 각광을 받고 있는 물질이다. 최근 디바이스 응용의 효율을 높이기 위한 방편으로 나노막대에서 박막으로의 연구가 활발하다. 본 실험은 MOCVD률 이용하여 p-si 기판위에 나노막대를 성장시킨 후 압력 및 온도 등의 공정변수를 조절하여 나노막대에서 박막으로 성장형태를 변화시켰다. SEM으로 1 차원 나노막대에서 2차원의 나노박막으로 성장이 된 ZnO 하이브리드 구조를 확인할 수 있었다. 또, PL장비를 이용해 ZnO의 UV영역의 파장을 확인할 수 있었다.

• The Journal of the Korea Contents Association
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• v.7 no.12
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• pp.66-73
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• 2007

The Jewelry-relation industry is being placed in the crises which are serious with depression of domestic market, design development and a major force absence also high labor cost charge. The consumers have the value of the price preparation maximum and product differentiation which they want. The Jewelry CAD and RP equipment shorten cost of production enterprise which depended hand-metal work provided for the various design and a rapid new product. But until now, it was necessary to the original work of best condition casting vacuum cycle as difficult with direct casting of synthetic resin from RP equipment. I intend to imply significance about through the CAD and RP equipment application result with it analyses, after jewelry CAD and RP work applicable to direct casting will be possible and able to through the casting vacuum cycle produce the product which is suitable in the original production. Through the this paper jewelry secures a quality improvement of the product and discrimination characteristic being various competitive power of design and provide a new base in product production.

• Progress in Medical Physics
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• v.27 no.1
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• pp.14-24
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• 2016

Since the head and neck region is densely located with organs at risk (OAR), OAR-sparing is an important issue in the treatment of head and neck cancers. This study-in which different treatment plans were performed varying the head tilt angle on brain tumor patients-investigates the optimal head elevation angle for sparing normal organs (e.g. the hippocampus) and further compares the dosimetric characteristics of different types of radiation equipment. we performed 3D conformal radiation therapy (3D-CRT), intensity-modulated radiation therapy (IMRT), and tomotherapy on 10 patients with brain tumors in the frontal lobe while varying the head tilt angle of patients to analyze the dosimetric characteristics of different therapy methods. In each treatment plan, 95% of the tumor volume was irradiated with a dose of 40 Gy in 10 fractions. The step and shoot technique with nine beams was used for IMRT, and the same prescription dose was delivered to the tumor volume for the 3D-CRT and tomotherapy plans. The homogeneity index, conformity index, and normal tissue complication probability (NTCP) were calculated. At a head elevation angle of $30^{\circ}$, conformity of the isodose curve to the target increased on average by 53%, 8%, and 5.4%. In 3D-CRT, the maximum dose received by the brain stem decreased at $15^{\circ}$, $30^{\circ}$, and $40^{\circ}$, compared to that observed at $0^{\circ}$. The NTCP value of the hippocampus observed in each modality was the highest at a head and neck angle of $0^{\circ}$ and the lowest at $30^{\circ}$. This study demonstrates that the elevation of the patients' head tilt angle in radiation therapy improves the target region's homogeneity of dose distribution by increasing the tumor control rate and conformity of the isodose curve to the target. Moreover, the study shows that the elevation of the head tilt angle lowers the NTCP by separating the tumor volume from the normal tissues, which helps spare OARs and reduce the delivered dose to the hippocampus.

• The KIPS Transactions:PartB
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• v.13B no.2 s.105
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• pp.187-196
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• 2006

In 3D animation most people adjust the moving motion of their characters on various terrains by using motion data acquired with the motion capture equipment. The motion data can be used to present real human motions naturally, but the data must be captured again to apply to the different terrains from those given at acquiring mode. In addition, there would be a difficulty when applying the data to other characters, in that case the motion data must be captured newly or the existing motion data must be heavily edited manually. In this paper we propose a unified method to generate human motions of walking and running for various terrains such as flat plane, inclined plane, stairway and irregular face. With these methods we are able to generate human motions controlled by the parameters : body height, moving speed, stride, etc. In the proposed methods, the positions and angles of joint can be calculated by using inverse kinematics, and we calculate the trajectory of the swing leg and pelvis according to the cubic spline. With these methods we were presented moving motions using a model of a human body.

• Journal of KIISE:Software and Applications
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• v.30 no.11
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• pp.1092-1101
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• 2003

Most of 3D character animation adjusts the gait of their characters for various terrains, using motion capture data through the motion capture equipments. This motion capture data can be naturally presented as real human motions, which are to be adjusted according to the various types of terrain. In addition, there would be a difficulty applying motion capture data for other characters in which the motion data will be captured again or edited for the existing motion data. Therefore, this paper proposes a method that is to generate walking motion for various terrains, such as flat, inclined plane, stair, and irregular face, and a method that is to calculate the trajectory of the swing leg and pelvis. These methods are able to generate various gaits controlled by the parameters of body height, walking speed, stride, etc. In addition, the positions and angles of joint can be calculated by using inverse kinematics, and the cubic spline will be used to calculate the trajectory of the joint.

• The Journal of Korean Society for Radiation Therapy
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• v.17 no.2
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• pp.155-160
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• 2005

Purpose : Many authors have been introduced field in field technique and 3-D conformal radiotherapy that increased the tumor dose as well as decreased the dose of abutting critical organ. These technique have multiple beam direction and small beam segments even below 10 MU(monitor unit)for each field. we have confirmed the influence of low MU on dose output and beam stability. Materials and Methods : To study the dose output, the dose for each field was always 90MU, but it divided into different segment size: 1, 2, 3, 5, 10, 15 segments, 90, 45, 30, 18, 9, 6 MU the measurements were carried out for X-ray energy 4 MV, 6 MV, 10 MV of three LINAC(Varian 600C, 2100C, 2100C, 2100C/D), in addition each measurement was randomly repeated three times for each energy. To study the field symmetry and flatness, X-omat V films were irradiated. After being developed, films were scanned and analyzed using densitometer. Results : Influence of low MU on dose is slightly more increase output about $1.2{\sim}2.9%$ in cGy/mu than 90MU, but may not changed beam quality(flatness or symmetry), Output stability depends on dose rate(PRF)rather than beam energy, field size. Conclusion : Presented result are under the limits(out put<3%, flatness<${\pm}3%$, symmetry<2%). The 3 accelerators are safe to use and to perform conformal radiotherapy treatments in small segments, small MU around 10MU. but Even if the result presented here under the limits, continuous adjustments and periodic QA should be done for use of small MU

• Journal of radiological science and technology
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• v.38 no.4
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• pp.421-427
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• 2015

In this study, we have observed the change of the Hounsfield (HU) in the alteration of by changing in size of physical area and setting size of region of interest (ROI) at focus on kVp and mAs. Four-channel multi-detector computed tomography was used to get transverse axial scanning images and HU. Three dimensional printer which is type of fused deposition modeling (FDM) was used to produce the Phantom. The structure of the phantom was designed to be a type of cylinder that contains 33 mm, 24 mm, 19 mm, 16 mm, 9 mm size of circle holes that are symmetrically located. It was charged with mixing iodine contrast agent and distilled water in the holes. The images were gained with changing by 90 kVp, 120 kVp, 140 kVp and 50 mAs, 100 mAs, 150 mAs, respectively. The 'image J' was used to get the HU measurement of gained images of ROI. As a result, it was confirmed that kVp affects to HU more than mAs. And it is suggested that the smaller size of physical area, the more decreasing HU even in material of a uniform density and the smaller setting size of ROI, the more increasing HU. Therefore, it is reason that to set maximum ROI within 5 HU is the best way to minimize in the alteration of by changing in size of physical area and setting size of region of interest.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2006.11a
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• pp.153-153
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• 2006

ZnO 박막은 II-VI족 화합물 반도체로서 상온에서 3.37eV 의 넓은 밴드갭을 가지고 있을 뿐만 아니라 GaN(28meV) 보다 상온에서 큰 엑시톤 결합 에너지(60meV)와 열 안정성을 가지고 있다. 특히 ZnO를 base로 한 2차원의 화합물 (MgZnO, CdZnO 그리고 MgO) 반도체 물질은 UV LED, 생 화학 센서와 투명전극 등으로 응용이 가능하다. ZnO/MgZnO 양자우울 구조의 양자제한 효과로 인한 엑시톤 결합에너지와 전기적 광학적 특성 향상으로 광전자 소 자 제작이 가능하다. 그렇지만, Zn-Mg 상평형도에서 ZnO 내에 Mg 고용도가 상온에서 열역학적으로 4at% 이하 이고, 또한 ZnO와 MgO는 각각 우르짜이트 구조와 면심입방 구조를 가지기 때문에 Mg 함량용 높이는데 어려움이 있다. 이러한 문제점을 해결하기 위해 열처리를 함으로써 MgZnO 박막 내에 Mg 함량의 증가와 결정성 향상으로 고품질의 광전자 소자 제작을 가능하게 했다. 본 실험에서는 RF 마그네트론 스퍼터링 장비로 MgZnO 박막 성장 후 Si 기판위에 성장된 박막의 결정성 향상과 MgZnO 내의 Mg 함량 변화를 관찰하기 위해 성장된 박막에 대한 열처리 효과를 연구 하였다.