• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회A
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• pp.332-336
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• 2007

Temperature is an essential process variable in nanoimprint lithography(NIL) where the temperature varies between room temperature and above the glass transition temperature. To simulate NIL process, we employ both the Nose-Poincare method for temperature controlled molecular dynamics(MD) and force field for polymer material i.e. polymethyl methacrylate(PMMA), which is most widely selected as NIL resist. Nose-Poincare method, which convinces the conservation of Hamiltonian structure and time-reversal symmetry, overcomes the drawbacks inherent in the conventional methods such as Nose thermostat and Nose-Hoover thermostat. Thus, this method exhibits enhanced numerical stability even when the temperature fluctuation is large. To describe PMMA, we adopt the force field which account for bond stretch, bending, torsion, inversion, partial charge, and van der Waals energy.

• Journal of Biosystems Engineering
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• 제33권5호
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• pp.333-339
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• 2008

The purpose of this study was to develop a portable electronic nose system to measure volatile components of agricultural and food products. Also, a graphical operating software to control the electronic nose system and to acquire signals through the Internet was developed. An array of five commercial metal oxide gas sensors was used to detect various volatile gas components of target samples. Transient and steady state signals were analyzed to extract variables related to sample states, To find optimal operating conditions of the system, several experiments were performed with different gas chambers, vacuum pumps, gas sampling temperatures, and sample container sizes. The patterns of gas sensor signals were analysed to find effects of the various conditions.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제19권4호
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• pp.333-342
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• 1997

The purpose of this study was to establish a set of standard values for the form of the nose and its relationship to other craniofacial structures in young korean adults in angle's class I occlusion. The subjects were 40 (20 male, 20 female) Korean dental students in angle's class I occlusion. Lateral cephalometric radiographs were used to determine the form of the nose and its positon relative to other craniofacial structures. The results were obtained as followed. 1. There was a significance between the registered male and female measurements in nasal height(P<0.05). (Male: 58.23mm Female : 54.62mm) 2. There was a significance between the registered male and female measurements in nasal length(P<0.05). (Male : 54.18mm Female : 49.38mm) 3. The vertical distances from the tip of the nose in Korean adults were significantly greater in the male(P<0.05) and were smaller in both sex in comparison with caucasian.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2004년도 가을 학술발표회 논문집
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• pp.187-194
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• 2004

The structural behavior of superstructure by ILM is strongly dependent on the process of launching nose according to the construction process. The ratios of length, weight, and flexural stiffness of launching nose to those of superstructure are taken as the analysis parameters in this study. The interaction behaviors are analyzed according to the variation of parameters. Design formulas to pursue the optimum values for length, weight, and stiffness of launching nose are suggested through the parametric study. As a result, the minimum stiffness ratio is analyzed as I₂/I=0.045 and I₁/I=0.02 for the optimum track of the sectional force while the elastics modulus ratio is 6.8359. Additionally, the design results of real projects are analyzed by the developed formulas to verify that they are designed well in structurally optimal point of view.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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• pp.123-126
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• 2005

The IEEE 1451.4 standards defines an architectural model for interfacing smart transducers for sensors & actuators. This standard allows analogue transducers to communicate their identification and calibration data in a digital format. A digital format is called TEDS(transducer electronic data sheet). However, the standard template of IEEE 1451.4 TEDS do not supports gas sensors to use in electronic nose system, such as array sensors. In this paper, a solution to standardize sensors for electronic nose systems is presented.

• 전기전자학회논문지
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• 제23권4호
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• pp.1477-1480
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• 2019

동물이 미리 등록된 특정 개체인지 아닌지를 확인하는 동물 인증은 동물 병원, 동물 입양 센터, 동물 보호소, 동물 보험사 등 다양한 곳에서 사용된다. 사람을 확인하기 위해 지문 인식을 수행하듯 동물을 확인하기 위해서는 비문 인식이 널리 사용된다. 본 논문에서는 비문 인식을 통해 동물 등록 및 인증을 수행하고 이를 블록체인 네트워크를 통해 다양한 클라이언트와 연결해주는 동물 관리 시스템을 소개한다.

• Archives of Plastic Surgery
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• 제47권6호
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• pp.516-521
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• 2020

In rhinoplasty, osteotomy is becoming more and more frequent as a way to achieve aesthetically pleasing and functional results, as well as patient satisfaction. In procedures to correct a deviated nose, osteotomy to correct the bone plays an essential role in addition to correction of the septum and cartilage, and osteotomy can reduce the wide nose bridge and give a slightly higher appearance in Asian rhinoplasty. However, osteotomy is relatively invasive, and the nasal bones of Asians are often low and thick, so bleeding or swelling during surgery can be somewhat more severe, and a stuffy nose can occur after surgery if osteotomy is performed incorrectly. Since side effects are possible, it is necessary to have a precise understanding of the relevant anatomy and technique. Several articles have described nasal bone osteotomy in rhinoplasty, and this review article introduces the methods presented in various articles, describes indications and limitations, and reviews the relevant anatomical structures and techniques in an accurate manner. We introduce a method that can increase patients' satisfaction and the completeness of surgery through accurate osteotomy, as well as reducing the risk of side effects.

• 한국생산제조학회지
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• 제5권3호
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• pp.58-65
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• 1996

This thesis is concerned with the study on the characteristics of the cutting resistance occurring in finish machining of hardened steels such as carbon tool steel and alloy tool steel by a ceramic tool with nose radius. For the purpose, the shape of cutting cross-section made at nose part of the tool was analyzed geometrically and the wear mechanism on the flank face of the ceramic tool is investigated. In order to investigate the characteristics of cutting resistance two categories of cutting conditions are suggested, along with geometrical analysis. One category includes the conventional cutting parameters such as feed and depth of cut, another containing new cutting parameters of thickness of cut and width of cut etc. Thickness of cut width of cut and area of undeformed chip section formed by the condition of engagement between workpiece and cutting tool are determined as the function of feed, depth of cut and nose radius of cutting too, And an effective approach angle is determined by depth of cut and nose radius.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2000년도 추계학술대회 논문집
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• pp.506-513
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• 2000

The tunnel booming noise generated by a train moving into a tunnel has been one of the most serious constraints in the development of the high-speed trains. It is well known that the nose shape of the train has the significant influence on the intensity of the booming noise. In this study, the nose shape has been optimized by using the response surface methodology and the axi-symmetric compressible Euler equations. The parametric studies are also performed with respect to the slenderness ratio, the blockage ratio and the train speed to investigate their sensitivities to the optimization results. The results show that it is possible to define more general design space by introducing the Hicks-Henne shape functions, resulting in the more effective nose shape than that of Maeda. The mechanism and the aspects of the train-tunnel interaction were also investigated from the results of the parametric study.

• 한국전산유체공학회지
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• 제20권4호
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• pp.36-43
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• 2015

Accurate prediction of supersonic transition is required for the heat transfer estimation over supersonic double compression ramp flows. Correlation-based transition models were assessed for a supersonic double ramp problem. Numerical results were compared with experimental data from RWTH Aachen University. A parametric study on the nose bluntness was performed using a selected transition model. As the nose bluntness increases, the boundary layer thickness is increased and the triple point of shock interactions moves downstream. The peak magnitude of the heat transfer is consequently decreased with the nose bluntness.