• 대한지리학회지
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• 제48권5호
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• pp.750-767
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• 2013

이 연구의 목적은 프랑스 혁명 초기의 행정구역 변경에 관한 지리적인 논의를 고찰하고, 이 과정에서 지도가 어떤 목적으로 활용하였는지를 살펴보는 것이다. 이를 위해 먼저 구체제의 행정구역 개편을 주장하는 개혁주의자들의 논거를 살펴보았는데, 일부 중농주의자들은 정교한 지도 활용을 통해 구체적인 행정구역 개편논리를 가지게 되었음을 확인하였다. 둘째, 제헌의회에서의 행정구역관련 논의를 의회회의록을 분석하여 고찰하였는데, 공간을 정각형으로 균등하게 분할하여 유토피아를 구현하려는 혁명가들의 사상의 근저에는 카시니의 기하학 정신에 영향을 받은 에슬른의 지도가 있음을 확인하였다. 셋째, 의원들은 에네킨의 지도를 근거로 데파르트망의 수와 경계를 확정하였다. 지역대표들과의 논의 과정에서 정사각형의 격자는 자연경계의 한계와 지역의 경제적 이익에 봉착하여 불규칙한 형태의 역사적 경계를 그대로 유지하는 불규칙한 다각형의 형태로 변했다. 넷째, 카시니 4세는 새로운 행정구역을 카시니 지도 위에 그려서 의회에 보고하였고 이는 새로운 행정구역으로 확정되었다.

• 소성∙가공
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• 제25권6호
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• pp.379-389
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• 2016

As a stator for steam turbine diaphragm, hollow-type nozzle stator to substitute for conventional solid one is introduced in this study. This hollowed stator can be separated into two parts such as upper and lower plates with large and curved surface area. This study focuses on thick plate forming process for the upper plate of the hollow-partitioned nozzle stator. First, to reduce forming defects such as under-cut and localized thinning of the deformed plate, and to avoid tool interruption between forming punch and lower die, tool design including the position determination of forming surfaces is performed. Uni-axial tensile tests are carried out using SUS409L steel plate with initial thickness of 5.00mm, and plastic strain ratio (r-value) is also obtained. Due to the asymmetric curved configuration of the upper plate, it is hard to adopt a series of blank holder or draw-bead, so the initial plate during this thick plate forming experiences unstable and non-uniform contact. To easy this forming difficulty and find suitable tool geometry without sliding behavior of the workpiece in the die cavity, two geometric parameters with respect to each shoulder angle of the lower die and the upper punch are adopted. FE models with consideration of 21 combinations for the geometric parameters are built-up, and numerical simulations are performed. From the simulated and predicted results, it is shown that the geometric parameter combinations with ($30^{\circ}$, $90^{\circ}$) and ($45^{\circ}$, $90^{\circ}$) for the shoulder angle of the lower die and the upper punch are suitably applied to this upper plate forming of the hollow-partitioned nozzle stator used for the turbine diaphragm.

• 한국의류산업학회지
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• 제12권1호
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• pp.10-20
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• 2010

In this research, by yearly subdividing and analyzing the characteristic of the embroidery design according to the garment item with a season the high value added is raised for a differencing and high performance conversion of the high fashion design and there is an object. In 2004, when the total 474 chapter was selected in S/S season till F/W season in 2008 and the embroidery design characteristic according to the kind of an item the analyzing method and statistical method was used. As to the first, and the embroidery design in which it follows of the garment item showed the stylized, and the plant motive of the geometric pattern by an edge and composite arrangement in an one-piece and blouse with the satin stitch and cut work technique. A monotone and the bright tone were used. The second, and the season different difference, the out line stitch, an applique, and the cut work technique S/S season were a feature. A plant, and the animal motive were expressed as the front arrangement and the monotone of the achromatic color appeared. As to F/W season, the long short stitch and satin stitch techniques were with the characteristic profit. The abstract motive showed up as the edge alignment and composite arrangement. And the plain tone and the monotone of the chromatics combination color are used. In the third, and the chronological difference, an applique the embroidery technique showed up in the out line stitch, and 2007 years in 2004 years and 2006 years. And the sentence motive of the animal, and the abstract motive the embroidery motive are embossed in 2005 years and 2006 years in 2008 years.

• Journal of the Korean Wood Science and Technology
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• 제38권3호
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• pp.199-204
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• 2010

전통공법에서는 주로 소나무를 수가공하여 구조부재로 사용하고 있다. 주먹장 접합(이음, 맞춤)은 일반 가구나 구조부재의 접합에 사용되고 있으며, 수가공이나 간단한 기계가공에 의해 쉽게 가공할 수 있는 이점이 있다. 비록 외관상 선형적인 가공이 주를 이루지만, 손쉬운 짜맞춤이 될 수 있어야 하는 고도의 가공정밀성이 요구된다. 더욱이, 장부와 장부받이는 틈새없는 긴결한 접합이 이루어져야 한다. 주먹장접합부에 대한 과학적인 연구는 체계적으로 수행된 예가 많지 않으므로 전통공법과 국산재 활용이라는 관점에서 낙엽송집성재를 기계가공하여 이용하였다. 통주먹장이음 접합부의 인장성능을 파악하기 위하여 150 mm 정각 낙엽송 집성재를 사용하였으며, 내력성능에 영향을 끼치는 주먹장의 다양한 기하학적 요소(장부 너비, 길이, 각도)에 대해 조사하였다. 보강목을 설치하지 않은 시험편은 장부받이(장부홈)의 모서리부에서 할렬이 발생하며 내력도 낮게 나타났다. 기둥머리의 화통맞춤 및 주두와 같은 상황을 고려한 보강시험편은 최대인장내력에서 2배 이상의 성능을 발휘하였다. 장부의 적정각도는 25도 수준이었으며, 어깨폭의 변화와는 상관성이 없는 것으로 나타났다.

• 대한교통학회지
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• 제21권6호
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• pp.57-65
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• 2003

본 연구는 지하철 역사 공사가 이루어지는 교통량이 많은 광장형 교차로에서의 공사중 처리 방안을 제시하는 것으로 대부분의 지하철 역사는 혼잡한 교차로에서 위치하게 되어 기존의 복공식 교통처리방안으로 할 경우에는 공사로 인한 차선감소와 차선변경으로 인한 차량지체나 사고의 위험성이 많으며 공사가 단계별로 이루어지기 때문에 공사기간도 길어지고 공사비용도 많이 소요된다. 따라서, 본 연구에서는 충분한 공사 작업공간의 확보와 원활한 교통소통을 제공하기 위하여 현대식 로터리에 신호운영을 도입한 방식(SMR)을 사례지점인 두류네거리에 적용하여 기존의 복공식 교통처리방안과 SMR방식에 대한 효율성을 비교${\cdot}$분석하였다. 신호로 운영되는 현대식 로터리(SMR)의 도입은 공사중 교통처리방안이 기존 복공식 교통처리방식과 대등한 교통처리 효과를 나타낼 수 있으면서, 공사를 위한 공간확보 및 공사비, 공사기간 절감 효과를 기대할 수 있는 교통처리방안이다. 본 연구에서 제시된 SMR방식은 기존의 교통처리방식의 문제점인 공사기간과 공사 작업공간 협소, 교통혼잡, 교통소통을 증진시키는 새로운 운영방식으로서 향후 광장형 교차로에서 지하철공사 뿐만 아니라 공사시 교통처리 방안으로서 광범위하게 적용될 수 있다.

• 한국CDE학회논문집
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• 제15권3호
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• pp.178-188
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• 2010

This paper addresses the problem of determining if two surfaces intersect tangentially or transversally in a mathematically consistent manner and approximating an intersection curve. When floating point arithmetic is used in the computation, due to the limited precision, it often happens that the decision for tangential and transversal intersection is not clear cut. To handle this problem, in this paper, interval arithmetic is proposed to use, which provides a mathematically consistent way for such decision. After the decision, the intersection is traced using the validated ODE solver, which runs in interval arithmetic. Then an iterative method is used for computing the accurate intersection point at a given arc-length of the intersection curve. The computed intersection points are then approximated by using a B-spline curve, which is provided as one instance of intersection curve for further geometric processing. Examples are provided to demonstrate the proposed method.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2004년도 추계학술대회
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• pp.1698-1703
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• 2004

To understand the high expansion effects by adopting intake closing time in the cases of compensating intake air-mass and effective compression ratio simultaneously, fundamental study was carried out by using RICEM realizing Atkinson cycle. Intake air-mass and effective compression ratio were compensated by increasing supercharged pressure and geometric compression ratio. The results showed that the increasing rates of expansion ratio and expansion-compression ratio were increased by compensating both a intake air-mass and effective compression ratio the same tendencies were obtained with the increases of compression ratio and cut off ratio It was also found that LIVC has more advantages in expansion ratio and effective work than those of EIVC under above conditions.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 1997년도 추계학술대회 논문집
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• pp.207-212
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• 1997

The purpose of this study is the development of CAM system which can cut and measure any shape by machining center and coordinate measuring machine. The overall goal of the CAM system is to achieve the CNC machining, from digitizing through to final cutting. The hardware of the system comprises PC and machining center, CMM. There are three steps in the CNC machining, (1) workpiece measuring on the CMM, (2) geometric modeling by the CAD system, (3) NC commands generation by the tool path compensated for tool nose radius. It is developed a software package, with which can conduct a micro CAM system in the PC without economical burden.

• 대한산업공학회지
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• 제31권4호
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• pp.316-333
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• 2005

Although some successful recognition algorithms have been developed, most of them did emphasize on extracting accurate interpretations without considerations of manufacturability. Evaluating the manufacturability for multiple features leads to produce the machining sequences. In this paper, the A* algorithm guarantees the optimal setup sequences with minimizing the machining cost. Also, tolerances including surface roughness are converted to STEP formats to be utilized for more reliable process plans. Finally, decision tables are used to create the detailed operational sequences based on geometric tolerances and surface roughness. Machining parameters such as feed, depth of cut, and cutting speed for each operation are added to the routing sheet. Windows are presented to show how the entire system works for a sample part.

• 한국정밀공학회지
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• 제16권7호
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• pp.188-195
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• 1999

Cutting edge plays an important role in generating machined surface. In order to consider the geometric effects of the cutting edge on mechanical states, the concept of ploughing force and stagnation point was introduced which explains the generating mechanism of machined surface during cutting. The effects of edge radius and nose radius of cutting tool on the distribution of residual stresses of the machined surface having several hardness were studied. Good machined surface having high compressive residual surface stresses can be achieved if cutting tools having large edge radius and small nose radius are used for cutting work materials having high hardness with high depth of cut. The magnitude of edge radius and the hardness of work material also affected the shape of the chip in orthogonal cutting.