• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2013년도 추계학술대회
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• pp.560-562
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• 2013

스마트폰의 대중화로 인한 개인별 취향에 따른 생활의 변화와 개인의 맞춤형 서비스에 대한 관심이 증가하고 있다. 이러한 시대적인 변화의 요구에 공공기관과 박물관 그리고 과학관에 이르기까지 개인별 맞춤형 서비스에 대한 시스템의 변화를 추구하고 있다. 특히 박물관, 미술관, 과학관은 관람이라는 공통되어진 요소를 가지고 있으며, 단체 관람과 개인별 관람형태가 이루어지고 있다. 박물관과 과학관은 미술관과는 달리 역사와 과학교육이라는 대 국민적인 목적이 담겨져 있으며, 테마파크와는 달리 엔터테인먼트와 교육을 병행해야하는 공공기관으로서의 기대치가 큰 것이다. 이러한 목적을 달성하기 위해서는 전시물에 대한 충분한 몰입도를 높여야 하며, 그와 병행으로 전시물에 대한 연령대별 설명이 부가되어야 한다. 따라서 본 연구에서는 증강현실을 이용한 효율적인 엔터테인먼트 기능과 교육을 함께 병행할 수 있는 방안에 대하여 연구하고자 한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 C
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• pp.2101-2103
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• 2000

In this paper, it is purpose to develop a pulsed $CO_2$ laser with stable output at pulse repetition rate range of 2 kHz. We used a IGBT as a switching device. The laser cavity was fabricated as an axial and water cooled type. It was used a ring blower to increase a cooling effect. The laser performance characteristics as parameters, such as pulse repetition rate, gas pressure have been investigated. The experiment was done under 3 electrode-type instead of 2 electrode-type. To achieve 3 electrode-type, we used two pulse-transformers which is operated parallel. As a result. the maximum output was about 28 W at the total pressure, of 20 Torr(the gas mixture $CO_2$:$N_2$:He=1:9:15 and the pulse repetition rate of 1300 Hz).

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제5권3호
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• pp.206-215
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• 2005

In this paper, we propose a new design method of Genetic Algorithm Processor(GAP) and Evolvable Hardware(EHW). All sorts of creature evolve its structure or shape in order to adapt itself to environments. Evolutionary Computation based on the process of natural selection not only searches the quasi-optimal solution through the evolution process, but also changes the structure to get best results. On the other hand, Genetic Algorithm(GA) is good fur finding solutions of complex optimization problems. However, it has a major drawback, which is its slow execution speed when is implemented in software of a conventional computer. Parallel processing has been one approach to overcome the speed problem of GA. In a point of view of GA, long bit string length caused the system of GA to spend much time that clear up the problem. Evolvable Hardware refers to the automation of electronic circuit design through artificial evolution, and is currently increased with the interested topic in a research domain and an engineering methodology. The studies of EHW generally use the XC6200 of Xilinx. The structure of XC6200 can configure with gate unit. Each unit has connected up, down, right and left cell. But the products can't use because had sterilized. So this paper uses Vertex-E (XCV2000E). The cell of FPGA is made up of Configuration Logic Block (CLB) and can't reconfigure with gate unit. This paper uses Vertex-E is composed of the component as cell of XC6200 cell in VertexE

• 한국의류산업학회지
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• 제10권3호
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• pp.329-334
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• 2008

The purpose of this research is to develop the design, pattern and size system of brief as a measurement garment in order to obtain more precise silhouettes and sizes of the body in 3D measurements. The results of this research are as follows: First, nylon/lycra materials which elasticity is equivalent to 18%(wale) and 27%(course), were selected as a material for briefs to minimize possible error in measurement and deformation of body shape caused by looseness or tightness in its measured parts. And T-back style design was selected, of which briefs neither deform human body nor cause overlapping or excessive tightness when was put on the measurement garment over it. Second, different darts for men and women were adopted into the pattern in consideration for the shape of hip. Third, the waist band of briefs was located between the waistline and abdominal girth line so that it didn't interfere with measurement, and using a wide band of 40mm minimized the tightness of the human body. In addition, the stitch lines and sewing procedure were simplified to minimize the deformation of body shape resulting from inseams and stitch lines. Finally, for the size of briefs, 6 cm intervals were set on the basis of the waist girth and 8 kinds for men and 6 kinds for women were selected in descending order of appearance rate by the interval sections. English T meaning T-back design and numbers representing the waist girth were marked in parallel for the name of size.

• Structural Monitoring and Maintenance
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• 제6권4호
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• pp.317-346
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• 2019

Performance assessment of pavements proves useful, in terms of handling the ride quality, controlling the travel time of vehicles and adequate maintenance of pavements. Roughness profiles provide a good measure of the deteriorating condition of the pavement. For the accurate estimates of pavement roughness from dynamic vehicle responses, vehicle parameters should be known accurately. Information on vehicle parameters is uncertain, due to the wear and tear over time. Hence, condition monitoring of pavement requires the identification of pavement roughness along with vehicle parameters. The present study proposes a scheme which estimates the roughness profile of the pavement with the use of accurate estimates of vehicle parameters computed in parallel. Pavement model used in this study is a two-layer Euler-Bernoulli beam resting on a nonlinear Pasternak foundation. The asphalt topping of the pavement in the top layer is modeled as viscoelastic, and the base course bottom layer is modeled as elastic. The viscoelastic response of the top layer is modeled with the help of the Burgers model. The vehicle model considered in this study is a half car model, fitted with accelerometers at specified points. The identification of the coupled system of vehicle-pavement interaction employs a coupled scheme of an unbiased minimum variance estimator and an optimization scheme. The partitioning of observed noisy quantities to be used in the two schemes is investigated in detail before the analysis. The unbiased minimum variance estimator (MVE) make use of a linear state-space formulation including roughness, to overcome the linearization difficulties as in conventional nonlinear filters. MVE gives estimates for the unknown input and fed into the optimization scheme to yield estimates of vehicle parameters. The issue of ill-posedness of the problem is dealt with by introducing a regularization equivalent term in the objective function, specifically where a large number of parameters are to be estimated. Effect of different objective functions is also studied. The outcome of this research is an overall measure of pavement condition.

• 대한기계학회논문집A
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• 제27권9호
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• pp.1562-1570
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• 2003

The prediction of the inelastic behavior of the structure is an essential part of reliability assessment procedure, because most of the failures are induced by the inelastic deformation, such as creep and plastic deformation. During decades, there has been much progress in understanding of the inelastic behavior of the materials and a lot of inelastic constitutive equations have been developed. The complexity of these constitutive equations generally requires a stable and accurate numerical method. The radial return mapping is one of the most robust integration scheme currently used. Nonlinear kinematic hardening model of Armstrong-Fredrick type has recovery term and the direction of kinematic hardening increment is not parallel to that of plastic strain increment. In this case, The conventional radial return mapping method cannot be applied directly. In this investigation, we expanded the radial return mapping method to consider the nonlinear kinematic hardening model and implemented this integration scheme into ABAQUS by means of UMAT subroutine. The solution of the non-linear system of algebraic equations arising from time discretization with the generalized midpoint rule is determined using Newton method and bisection method. Using dynamic yield condition derived from linearization of flow rule, the integration scheme for elastoplastic and viscoplastic constitutive model was unified. Several numerical examples are considered to demonstrate the efficiency and applicability of the present method.

• 한국의학물리학회지:의학물리
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• 제26권2호
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• pp.99-105
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• 2015

모니터 전리함은 의료용 선형가속기에서 방출되는 방사선의 세기와 출력 제어를 위하여 사용된다. 본 연구에서는 가속기 기반 방사선 발생장치의 제어 시스템 개발에 사용하기 위하여 모니터 전리함 시작품을 개발하였다. 개발한 모니터 전리함은 평행 평판형 전리함 형태로서 독립적 작동이 가능한 두 개의 전리함으로 구성되어 있으며, 전극의 재료는 방사선의 감쇠를 최소화하기 위하여 얇은 연성인쇄회로기판이 사용되었다. 전리함의 시험을 위하여 코발트-60 방사선원을 이용하여 측정된 전하의 포화특성과 선형성과 같은 선량학적 특성을 평가하였다. 결과적으로 개발된 시작품이 기본 성능을 만족하며 추가 연구의 가능성을 확인하였다.

• 지구물리
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• 제2권4호
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• pp.251-258
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• 1999

서해연안에 위치한 시화호 내에 발달하였던 조간대에서 고해상도 탄성파 탐사를 수행하였다. 음원으로는 이동식 진동기를 이용하였으며 217개의 발파점에 대한 48 채널 탄성파 자료를 획득하였다. 자료처리에서 f-k 필터, 잔여정보정 및 중합 후 주파수 필터는 신호대 잡음비를 높이는 데 효과적이었다. 단면도의 해석을 통하여 음향기반암 상부에 두 층서단위로 구분되는 퇴적층서를 구분하였다. 가장 상부에 위치하는 층서단위 I은 조간대 기원의 퇴적층으로 평행하고 연속성이 좋은 반사층리가 분포하며, 평균 5 m 두께의 건조층(Unit Ia)과 15 m 이내의 함수층(Unit Ib)으로 구분된다. 층서단위 I에 의하여 부정합으로 덮여져 있는 층서단위 II는 불연속적이고 둔덕형 층리양상을 보이는데 이는 염하구환경에서 퇴적된 하천 충진 퇴적물을 지시한다. 이 층서단위는 최대 20 m의 두께를 갖는다. 음향기반암은 주변에 발달한 선캠브리아기 화강편마암으로 해석된다.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2007년도 동계학술발표대회 논문집
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• pp.510-515
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• 2007

A Study on Typical Rates of Water-use for School Facilities has been carried out in this work. Water supply system is given much weight in school facilities. Therefore, it set up a basis efficiency using of water sources to calculate typical rates of water use. The results are summarized as follows ; 1) On the whole, typical rates of water-use was founded out 15 L / stu. d in pirmary school, 10 L / stu. d in middle school and 30L / stu. d in high school smaller than the existing it. It was rate of water-use change as season and Max. Rates of water-use was July. 2) I deem that school hours are 5 hour's in primary school, 7 hour's in middle school and 8 hour's in high school. It the concept of 1 hour that is lesson time 40 minutes and resting time 10 minutes in primary school, lesson time 45 minutes and resting time 10 minutes in middle school and lesson time 50 minutes and resting time 10 minutes in high school. 3) It is desired that we calculate the volume of pump and water tank throughout this concept and the size of water tank should be 1.5 times with taking pick load into consideration by this study on typical rate of water-use. 4) The amount of using water increases in gradually and I consider the life cycle of facilities is more than 10 years. As a result, I can forecast that the size will be insufficiency but I deem that if we devise a plan about parallel pumping on water tank space, we can cope with it. Also, it is expected that we can cut back the transport energy by controlling pump volume.

• 융합정보논문지
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• 제10권8호
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• pp.35-39
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• 2020

DNN은 기존의 음성 인식 시스템에 비해 에러가 적으나 병렬 훈련이 어렵고, 계산의 양이 많으며, 많은 양의 데이터 확보를 필요로 한다. 본 논문에서는 이러한 문제를 효율적으로 해결하기 위해 GMM에서 모델 파라메터를 가지고 음소별 GMM 파라메터를 추정하여 음소 단위를 생성한다. 그리고 이를 효율적으로 적용하기 위해 특정 어휘에 대한 클러스터링을 통해 성능을 향상시키기 위한 방법을 제안한다. 이를 위해 3가지 종류의 단어 음성 데이터베이스를 이용하여 DB를 가지고 어휘 모델을 구축하였고, 잡음 처리는 워너필터를 사용한 특징을 추출하여 음성 인식실험에 사용하였다. 본 논문에서 제안한 방법을 사용한 결과 음성 인식률에서 97.9%의 인식률을 나타내었다. 본 연구에서 개선된 오버피팅의 문제점을 향상시킬 수 있는 추가적인 연구를 필요로 한다.