• 한국기계가공학회지
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• 제16권6호
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• pp.69-74
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• 2017

In the current machining industry, machining precision is necessary and machining is being carried out. In this ultra-precision machining industry, the fixation of the workpiece is very important and the degree of machining depends on the degree of fixation of the workpiece. In ultra-precision machining, various methods, such as using a vise chuck or the like and using bolt nut coupling, are used for fixing a workpiece to an existing machine tool. In particular, when the precision gripping force of the jig is insufficient during machining of the ultra-precision mold parts, the machining material shakes due to the vibration or friction, and the machining precision is lowered. In the ultra-precision machining of power transmission parts, such as gears, the accuracy of the product is then determined. In addition, the amount of heat generated during machining has a significant effect on the machining accuracy. This is because the vibration value changes according to the grasp force of the jig that fixes the workpiece, and the change in the calorific value due to the change in the main shaft rotation speed of the ultra-precision machining. The increase in the spindle rotation speed during machining decreased the heat generation during machining, and the machining accuracy was also good, and it was confirmed that the machining heat changed according to the fixed state of the workpiece and the machining accuracy also changed. In this study, we try to optimize the driving part of the power vise by using structural analysis, rather than the power vise, using the basic mechanical-type power unit.

• 수산해양교육연구
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• 제28권6호
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• pp.1549-1560
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• 2016

Today, all the countries of the world newly recognize importance of sea, which are focused on efforts for security of marine territory and fishes resources. Many of the coastal state, to strengthen the rights of their own country EEZ, marine survey and continental shelf development, travels through such maritime jurisdiction in the territorial sovereignty and the EEZ overlaps, deepening complex interests between neighboring countries cooperation activities of the fierce competition, the domestic and foreign been has been carried out. Under such circumstances, is devastated coastal of China, our territorial waters and EEZ has been violated more and more, in spite of the powerful crackdown maritime public power, illegal fishing more resistance intensified. They tend to be gradually organization, collectivization and atrocities. Currently, illegal fishing of Chinese fishing boats in the West Sea of Korea, including the waters near Yeonpyeong Island is prevalent as operating in the coast of the country. Furthermore regrettable one is illegal on a scale and the situation where South Korea of scale of damage caused by it have not been accurately grasp of the operation, but that there is damage of Korea official duty enforcement to crack down the increase to illegal operations year after year have occurred. Violent, illegal fishing of Chinese fishing boats, in order to eradicate the operations of insane at our sea, we investigated to the infringement situations of fisheries resources by multiple fields. each of problems presenting a specific preservation plan in accordance with the function and role of the maritime enforcement organization and other government organization the point. at the same time we will try to seek measures such as a scheme that it is possible to increase the capacity.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2008년도 동계학술발표대회 논문집
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• pp.286-291
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• 2008

Insulation of refrigerator with gasket material near door becomes the technical point at the aspect of heat loss and energy efficiency. Heat loss of refrigerator through the gasket is nearly 30%. In this paper, quantitative evaluation method of heat loss through gasket in established suggest the method for the improvement of heat loss. To analyze the heat transfer, we have used the common software Fluent that is used to CFD. Because of using the convection coefficient of heat transfer, we have solved only the equation of energy for heat transfer. As a result, we have known that heat loss flows through the heat flux vector and that the heat gathered out of the outside iron plate is transferred inner part through the gasket and ABS, etc. Through the result of the numerical simulation that use sub-gasket, we have known that we are able to reduce the heat loss about $20{\sim}40%$. when we applied that sub-gasket on a real refrigerator, the power consumption had reduced about 4.76%. In addition, when we applied a more improved sub-gasket on a real refrigerator and measured the power of the refrigerator the power consumption does reduce about 3% and we will try to apply the improved sub-gasket on a new models of refrigerator.

• 한국컴퓨터정보학회논문지
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• 제18권1호
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• pp.185-192
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• 2013

3D 그래픽 소프트웨어의 대중화, 하드웨어의 발전 등으로 학교교육에서 3D 그래픽 도구를 보다 용이하게 사용할 수 있게 되었다. 그리고 초등학교의 도형영역의 교과 내용이 보다 강화되어 도형영역의 학습 난이도는 증가하였다. 이에 관련 소프트웨어인 스케치업 프로그램을 이용하여 도형 영역에 학습 효과를 증진시켜 보고자 한다. 그러기 위해 기존 연구를 분석하였으며 3D 그래픽 소프트웨어를 분류하고 벡터 그래픽 소프트웨어에 대한 선택의 기준을 제시하여 스케치업을 선택한 이유를 설명하였다. 스케치업을 활용하기 위해 도형영역의 단원을 재구성하였는데 주로 입체도형을 만들고 회전하고 단면을 파악하는 내용을 선정하여 재구성하였다. 그리고 입체도형 쌓기에 대한 내용을 교육과정의 초기에 삽입하였다. 10개 차시를 구성하고 교수학습에서 스케치업을 활용하며 재구성 교육과정을 실천하였다. 그리고 t 검증을 통해 전후 검사를 한 결과 공간 시각화 능력과 공간 방향 능력 분야에서 유의미한 통계 결과가 나타났다. 따라서 스케치업을 이용한 도형학습에의 적용은 효과적인 것으로 해석할 수 있다.

• 한국컴퓨터정보학회논문지
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• 제10권4호
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• pp.47-56
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• 2005

웨어러블 컴퓨터의 개발로 인해 인간과 컴퓨터간의 전통적인 인터페이스는 점차 사용하기 불편하게 되었고 이는 새로운 형태의 인터페이스에 대한 요구로 이어지게 되었다. 본 논문에서는 이러한 추세에 맞추어 디지털 카메라를 통해 인간의 제스처를 인식하는 새로운 인터페이스를 연구하였다. 카메라를 통해 손 제스처를 인식하는 방법은 빛과 같은 주변 환경에 영향을 받기 때문에 탐지기는 덜 민감해야 한다. 최근에 Viola 탐지기는 얼굴 탐지에 좋은 결과를 보여 주었으며, 이는 적분 이미지로부터 추출한 하얼 특징을 이용한 Adaboost 학습 알고리즘을 사용하였다. 본 논문에서는 이 방법을 손 영역 탐지에 적용하였으며 피부색을 이용한 고전적인 방법들과 비교 실험을 수행하였다. 실험 결과는 빛과 같은 방해 요소가 있는 환경에서 Viola 탐지기가 피부색을 이용한 탐지 방법보다 더 견고함을 보여 주었다.

• 인문언어
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• 제1권2호
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• pp.91-104
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• 2001

Ford Madox Ford, the early twentieth-century writer most famous for his novel The Good Soldier, perceived his "business in life [as an] ... attempt to discover and to try to let you see where you stand." With this grand purpose in mind, Ford disregarded distinctions of genre in his prolific output of what we would consider novels, memoirs, literary criticism, travel writing, and history. Claiming that "the Novelist ... [is a] historian of his own time," Ford sought his own version of the "truth," a truth that was more faithful to his own subjective impressions than to verifiable "fact." Among these works that depict his age are a series of "memoirs" or "reminiscences," works published from the 1910s to the 1930s which carry out his Impressionistic purpose. What lies behind these memoirs is Ford′s view that his own individual history can be understood as his contemporary society′s collective history. This article explores Ford′s experimentation with boundaries of fact and fiction, and history and narrative, as he employs and expands the memoir form. In particular, 1 focus on two works, Memories and Impressions (1911) and It Was the Nightingale (1933), and Ford′s techniques in these memoirs, such as 1) the adoption of fictional personae from which to comment on his society at large and 2) the use of emblematic "parables" to encapsulate larger lessons of life within the minutiae of existence. Current theorists on the memoir form share interests in these questions of genre and of the social role of the memoir Nancy Miller, for instance, terms the memoir "the record of an experience in search of a community." This article engages these current discussions of the memoir genre by examining Ford′s early twentieth-century examples as innovative experiments that play with the boundaries between fiction and history, and personal impressions and collective truth.

• Journal of International Society for Simulation Surgery
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• 제3권1호
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• pp.36-38
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• 2016

Fibrous dysplasia is a relatively rare disease but the management would be quite challenging. Because this is not a malignant tumor, the preservation of the facial contour and the various functions seems to be important in treatment planning. Until now the facial bone reconstruction with autogenous bone would be the standard. Although the autogenous bone would be the ideal one for facial bone reconstruction, donor site morbidity would be the inevitable problem in many cases. Meanwhile, various types of allogenic and alloplastic materials have been also used. However, facial bone reconstruction with many alloplastic material have produced no less complications including infection, exposure, and delayed wound healing. Because the 3D printing technique evolved so fast that 3D printed titanium implant were possible recently. The aim of this trial is to try to restore the original maxillary anatomy as possible using the 3D printing model, based on the mirrored three dimensional CT images based on the computer simulation. Preoperative computed tomography (CT) data were processed for the patient and a rapid prototyping (RP) model was produced. At the same time, the uninjured side was mirrored and superimposed onto the traumatized side, to create a mirror-image of the RP model. And we molded Titanium mesh to reconstruct three-dimensional maxillary structure during the operation. This prefabricated Titanium-mesh implant was then inserted onto the defected maxilla and fixed. Three dimensional printing technique of titanium material based on the computer simulation turned out to be successful in this patient. Individualized approach for each patient could be an ideal way to restore the facial bone.

• Journal of International Society for Simulation Surgery
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• 제1권2호
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• pp.99-102
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• 2014

The skull defect can be made after the trauma, oncologic problems or neurosurgery. The skull reconstruction has been the challenging issue in craniofacial fields for a long time. So far the skull reconstruction with autogenous bone would be the standard. Although the autogenous bone would be the ideal one for skull reconstruction, donor site morbidity would be the inevitable problem in many cases. Meanwhile various types of allogenic and alloplastic materials have been also used. However, skull reconstruction with many alloplastic material have produced no less complications including infection, exposure, and delayed wound healing. Because the 3D printing technique evolved so fast that 3D printed titanium implant were possible recently. The aim of this trial is to try to restore the original skull anatomy as possible using the 3D printed titanium implant, based on the mirrored three dimensional CT images based on the computer simulation. Preoperative computed tomography (CT) data were processed for the patient and a rapid prototyping (RP) model was produced. At the same time, the uninjured side was mirrored and superimposed onto the traumatized side, to create a mirror-image of the RP model. And we fabricated Titanium implant to reconstruct three-dimensional orbital structure in advance, using the 3D printer. This prefabricated Titanium-implant was then inserted onto the defected skull and fixed. Three dimensional printing technique of titanium material based on the computer simulation turned out to be very successful in this patient. Individualized approach for each patient could be an ideal way to manage the traumatic patients in near future.

• Journal of Radiation Protection and Research
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• 제18권2호
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• pp.17-25
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• 1993

액체섬광 계수기에 대한 $^3H,\;^{14}C,\;^{36}Cl$의 베타선 스펙트럼의 시뮬레이션을 Monte Carlo 법으로 수행하였다. 베타선의 손실에너지는 'continuous slowing down approximation(CSDA)' 모형으로부터 구하였다. 순 베타방출 핵종이 균일하게 용해되어 있는 섬광용액은 $1.25cm{\times}3.5cm$의 원통형 geome try로 가정하였다. $^{14}C,\;^{36}Cl$에 대한 계산결과는 계수효율의 경우 실험 값과 2%의 범위 내에서 잘 일치하였으나 $^3H$에 대해서는 상당한 편차를 나타내었다. 이는 저 에너지 베타선에 대한 섬광용액 자체의 quenching 효과에 기인하는 것으로 판단된다.

• 한국음향학회지
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• 제20권2호
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• pp.10-15
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• 2001

본 논문에서 우리는 음향신호에서 음성과 음악을 분류하는 음성/음악 분류실험에 사용되는 특징들간의 상호조합을 비교하였다. 음향신호는 3가지 (음성, 음악, 음성+음악)와 2가지 (음성, 음악)로 분류하였다. 실험은 멜캡스트럼, 에너지, 영교차를 특징으로 사용하였고, 음성/음악 분류성능이 가장 좋은 특징간 상호조합을 모색하였다. 분류 알고리즘으로는 Gaussian Mixture Model (GMM)을 이용하였으며, GMM에 의한 데이터 모델링 전에 각기 다른 특징들을 하나의 특징공간에서 결합하였다. 실험결과 3가지 분류기준 적용시에는 멜캡스트럼, 영교차 조합이 가장 좋은 결과 (음성: 95.1％, 음악: 61.9％, 음성+음악: 55.5％)를 보였고, 2가지 분류기준 적용시에는 멜캡스트럼, 에너지 조합과 멜캡스트럼, 에너지, 영교차 조합이 가장 좋은 결과 (음성: 98.9％, 음악: 100％)를 보였다.