• 벤처창업연구
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• 제14권4호
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• pp.133-142
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• 2019

본 연구는 예비창업가의 성공가능성을 사전 평가하는 창업역량지표의 예측력을 실증하기 위해 실시하였다. 본 연구를 위한 설문은 자영업의 50%이상을 차지하고 있는 음식, 의류, 미용, 커피 업종을 대상으로 단일 시점에서 측정하였다. 총 1,600개의 설문지를 배포 회수하였으며, 회귀분석을 통한 검정을 통해 결과를 도출하였다. 실증을 통해 창업역량지표가 창업성과와 관계가 있다는 유의미한 결과를 실증할 수 있었다. 특히 직업만족도에 있어서는 유의미한 결과를 확인할 수 있었으나, 재무적성과의 세부 지표에서는 일부 유의적인 결과를 확인할 수 있었으며, 단일 지표로 구성된 창업역량지표 중에서 항목별로 추가적인 연구가 필요하다는 측면에서 의미를 확인할 수 있다. 정책적 관점에서 보았을 때, 창업가의 창업 성과를 높이기 위한 하나의 방편으로 창업역량지표는 좋은 도구가 될 수 있으며, 창업환경 조성을 위해서 확대 사용하는 것이 필요하다는 시사점을 얻을 수 있었다. 구체적으로 보았을 때, 측정된 역량지표 중에서 개인적인 특성이나 창업지식과 창업실행 역량, 외부환경 항목은 직업만족도와 밀접한 관련을 확인할 수 있었다. 미용, 음식을 비롯한 자영업종은 자신만의 노하우 또는 기술을 기반으로 하고 있다는 점에서 다른 것보다 실행 역량과 창업환경에 영향을 많이 받을 수 있다는 점에서 기회형 창업과 다른 특성을 보이고 있다고 할 수 있다.

• 산업경영시스템학회지
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• 제39권4호
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• pp.90-96
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• 2016

Incremental sheet forming (ISF) is a highly versatile and flexible process for rapid manufacturing of complex sheet metal parts. Compared to conventional sheet forming processes, ISF is of a clear advantage in manufacturing small batch or customized parts. ISF needs die-less machine alone, while conventional sheet forming requires highly expensive facilities like dies, molds, and presses. This equipment takes long time to get preparation for manufacturing. However, ISF does not need the full facilities nor much cost and time. Because of the facts, ISF is continuously being used for small batch or prototyping manufacturing in current industries. However, spring-back induced in the process of incremental forming becomes a critical drawback on precision manufacturing. Since sheet metal, being a raw material for ISF, has property to resilience, spring-back would come in the case. It is the research objective to investigate how geometrical shaping parameters make effect on shape dimensional errors. In order to analyze the spring-back occurred in the process, this study experimented on Al 1015 material in the ISF. The statistical tool employed experimental design with factors. The table of orthogonal arrays of $L_8(2^7)$ are used to design the experiments and ANOVA method are employed to statistically analyze the collected data. The results of the analysis from this study shows that the type of shape and the slope of bottom are the significant, whereas the shape size, the shape height, and the side angle are not significant factors on dimensional errors. More error incurred on the pyramid than on the circular type in the experiments. The sloped bottom showed higher errors than the flat one.

• Tuberculosis and Respiratory Diseases
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• 제83권1호
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• pp.1-13
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• 2020

For the past three decades, more than a thousand of genetic studies have been performed to find out the genetic variants responsible for the risk of asthma. Until now, all of the discovered single nucleotide polymorphisms have explained genetic effects less than initially expected. Thus, clarification of environmental factors has been brought up to overcome the 'missing' heritability. The most exciting solution is epigenesis because it intervenes at the junction between the genome and the environment. Epigenesis is an alteration of genetic expression without changes of DNA sequence caused by environmental factors such as nutrients, allergens, cigarette smoke, air pollutants, use of drugs and infectious agents during pre- and post-natal periods and even in adulthood. Three major forms of epigenesis are composed of DNA methylation, histone modifications, and specific microRNA. Recently, several studies have been published on epigenesis in asthma and allergy as a powerful tool for research of genetic heritability in asthma albeit epigenetic changes are at the starting point to obtain the data on specific phenotypes of asthma. In this presentation, we mainly review the potential role of DNA CpG methylation in the risk of asthma and its sub-phenotypes including nonsteroidal anti-inflammatory exacerbated respiratory diseases.

• 한국공작기계학회논문집
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• 제16권2호
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• pp.14-22
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• 2007

In this paper, the acoustic emission(AE) behaviors were investigated with single-and 2-spot resistance spot welded SPCC specimens. Test specimens were welded horizontally and/or vertically according to the rolling direction of base netal in 2-spot welding. In the case of 2-spot welding, when tensile-shear test has below amplitudes: crack initiation $50{\sim}60dB;$ tear fracture $40{\sim}50dB$. And when cross tensile test has below amplitudes: early stage $75{\sim}85dB;$ yielding point $65{\sim}75dB;$ post yielding $40{\sim}60dB;$ plug fracture $70{\sim}80dB\;or\;90{\sim}100dB$. Also, from the b-value that is slope of AE amplitude, we knew that there are lots of low amplitudes if b-value is big(i.e., tensile-shear $specimen{\rightarrow}tear$ fracture or shear fracture), and there are lots of high amplitudes if b-value is small(i.e.. cross tensile $specimen{\rightarrow}plug$ fracture). As the results of fiacture mechanism analyses through AE amplitude distributions, change of the b-value represented fracture patterns of materials. Correspondingly, low amplitude signals appeared in crack initiation, and high amplitude signals appeared in base metal fracture. We confirmed that these amplitude distributions represented the change or degradation of materials.

• 디자인학연구
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• 제14권4호
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• pp.57-64
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• 2001

한국의 자동차산업은 1980넌대와 1990년대 초까지 고도 성장기를 거치면서 자동차메이커의 수가 일곱 개에까지 이르는 등 급격한 양적 팽창을 하였으나, 1990년대 후반 이후에 밀려온 자동차산업에서의 전 세계적인 구조조정의 영향으로 규모의 경제를 실현하면서 내실을 기하기 위하여 인수와 합병 등의 방법을 통하여 변화되기에 이르렀다. 산업규모의 양적인 팽창에 치우쳤던 과거의 발전 방향에 비추어 볼 때, 단순한 기계제품, 또는 산업제품 이라기보다는 문화적 인식과 조형적 접근이 요구되는 자동차라는 독특한 공업제품은 그를 뒷받침 할만한 한국 사회의 전반적인 자동차에 대한 문화적 이해가 상대적으로 적었다. 이것은 자동차 산업을 수출 중심의 경제 발전을 위한 도구로써 인식한데서 기인한 한계로 볼 수 있다. 오랜 역사와 굴지의 규모를 가진 자동차 선진국의 예에서 살펴보듯이 자동차는 단순한 기계제품이나 상품으로써 가 아니라, 문화적 배경을 가지는 생활 도구로써의 접근이 요구되며, 그러한 인식을 통해서 세계시장에서 독자성을 가질 수 있는 품질과 디자인의 개발이 가능하다 글로벌 경쟁 체제에 들어간 21세기 한국의 자동차디자인과 산업의 당면과제는 외곽상품의 모방적인 개발 방식에서 탈피하여 한국 사회만의 문화적 특성을 정립시켜 대중적 인식 확대를 통한 독자성의 확보이며, 이를 위한 사회의 간접부분으로써 박물관의 역할이 더욱 중요하다.

• 한국생산제조학회지
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• 제22권2호
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• pp.263-267
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• 2013

The continuing demand for increasingly slimmer and brighter liquid crystal display (LCD) panels has led to an increased focus on the role of light guide panels (LGPs) or optical films that are used to obtain diffuse, uniform light from the backlight unit (BLU). The most basic process in the production of such BLU components is the micromachining of V-shaped grooves. Thus, given the current trend, micromachining of V-shaped grooves is expected to play increasingly important roles in today's manufacturing technology. LCD BLUs comprise various optical elements such as a LGP, diffuser sheet, prism sheet, and protector sheet with V-shaped grooves. High-aspect-ratio patterns are required to reduce the number of sheets and enhance light efficiency, but there is a limit to the aspect ratio achievable for a given material and cutting tool. Therefore, this study comprised a series of experimental evaluations conducted to determine the machining limit in microcutting V-shaped grooves on electroless nickel plated die materials when using single-crystal diamond tools with point angles of $20^{\circ}-80^{\circ}$. Cutting performance was evaluated at various cutting speeds and depths of cut using different machining methods and machine tools. The experimental results are that V-shaped patterns with angles of $80^{\circ}$ or up can be realized regardless of the machining conditions and equipment. Moreover, the feed rate has little effect on machinability, and it is thought that the fly-cut method is more efficient for shallow patterns.

• 한국중재학회지:중재연구
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• 제13권1호
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• pp.125-167
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• 2003

ADR program is designed to solve the problem such as the increase of suits and decision delayed. ADR program has the several significances, decreasing inappropriate cost as time and burden of courts, providing an approachable measure of relief and more efficient tool for settlement of dispute. Particularly ADR program satisfies the needs Intellectual property disputes need specialists that are versed in the subjected problem and, need to be souled quickly in confidence. And parties concerned are not good at the strict judicial procedure in courts, At this point, ADR program holds some advantages over court proceeding for intellectual property disputes. Specialists can be selected as arbitrators or mediator; Cofidentiality may be preserved; Flexibility allows settlement based on mutual commercial interests; Single solution is possible for multiple disputes involving parties from different countries. However, ADR program has not been properly used in. Korea, which is due to not only the lack of understanding the ADR program, but the poor number of filings and settlements. Intermediaries are not professional and also they do not take active hands in disputes. Sometimes, their fairness is asked as peacemakers. Eventually, it is said that this program is not enough to settle international disputes. To activate the ADR program, we can propose the ADR program annexed to court for example. And we can introduce the conciliation and arbitration to disputes in intellectual property. Traditionally arbitration has been a crucial issue in intellectual property disputes. In that intellectual property rights are granted by the local sovereign power, many legal systems in the past maintained the position that the existence, extent, meaning and application of such rights could only be definitively decided by the granting authority or the courts of that country. There is wide recognition that the arbitration of intellectual property is desirable. The law in most of the major countries has been changed in recent years in favor of arbitrability of intellectual property rights. We can also propose ADR on-line.

• 한국초등수학교육학회지
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• 제21권1호
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• pp.73-92
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• 2017

표는 자료 정리의 효과적 수단이지만, 그래프에 비해 시각적 한계가 뚜렷해서 수학교육분야에서 독립적인 연구주제로서의 위상을 차지하지는 못하고 있다. 그러나 표가 초등학교 수학과 교육과정에 명시적으로 포함된 만큼 표에 대한 체계적 연구와 합리적인 논의는 필요하다. 이 연구는 표를 다양한 용도로 적극적으로 활용하고 있는 핀란드 초등학교 수학교과서를 채택하여, 수학교과서에서 표가 어떤 의미로 어떻게 활용될 수 있는지 분석하였다. 연구결과 표는 통계영역 뿐만 아니라 수와 연산, 도형, 측정, 비와 비율 등의 수학내용을 전개하기 위한 유용한 수단이 될 수 있음을 확인하였다. 그 외에도 표의 외양이나 표를 구성하는 자료의 소재나 크기 등에 있어 의미 있는 시사점을 도출하였다.

• 한국조경학회지
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• 제26권3호
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• pp.78-78
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• 1998

The purpose of this research is to develop a CAD-based program for data analysis of digital elevation model(DEM) on the aspect of landscape assessment. When handling DEM data as a visual simulation of topographic landscape, it is basic interest to analyze visible area and visualize visual sensitivity distributions. In reference with landscape assessment, more intuitive and interactive visualizing tools are needed, specially in area of visual approach. For adaptability to landscape assessment, algorithmic approaches to visibility analysis and concepts for visual sensitivity calculation in this study were based on processing techniques of entity data control functions used in AutoCAD drawing database. Also, for the purpose of quantitative analysis, grid-type 3DFACE entities were adopted as mesh unit of DEM structure. Developed programs are composed of main part named VSI written in AutoLISP and two of interface modules written in dialog control language(DCL0 for user-oriented interactive usage. Definitions of camera points(view points) and target points(or observed area) are available alternatively in combined methods of representing scenic landscape, scenery, and sequential landscape. In the case of scene landscape(single camera to fixed target point), only visibility analysis in available. And total visibility, frequency of cumulative visibility, and visual sensitivity analysis are available in other cases. Visual sensitivity was thought as view angle(3 dimensional observed visual area) and the strengths were classified in user defined level referring to statistical characteristics of distribution. Visibility analysis routine of the VSI was proved to be more effective in the accuracy and time comparing with similar modules of existing AutoCAD third utility.

• 한국안전학회지
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• 제33권6호
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• pp.144-156
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• 2018

Level 3 Probabilistic Safety Assessment (PSA) is performed for the risk assessment that calculates radioactive material dispersion to the environment. This risk assessment is performed with a tool of MELCOR Accident Consequence Code System (MACCS2 or WinMACCS). For the off-site consequence analysis of multi-unit nuclear power plant (NPP) accident, the single location (Center Of Mass, COM) method has been usually adopted with the assumption that all the NPPs in the nuclear site are located at the same COM point. It was well known that this COM calculation can lead to underestimated or overestimated radionuclide concentration. In order to overcome this underestimation or overestimation of radionuclide concentrations in the COM method, Multiple Location (ML) method was developed in this study. The radionuclide concentrations for the individual NPPs are separately calculated, and they are summed at every location in the nuclear site by the post-processing of radionuclide concentrations that is based on two-dimensional Gaussian Plume equations. In order to demonstrate the efficiency of the ML method, radionuclide concentrations were calculated for the six-unit NPP site, radionuclide concentrations of the ML method were compared with those by COM method. This comparison was performed for conditions of constant weather, yearly weather in Korea, and four seasons, and the results were discussed. This new ML method (1) improves accuracy of radionuclide concentrations when multi-unit NPP accident occurs, (2) calculates realistic atmospheric dispersion of radionuclides under various weather conditions, and finally (3) supports off-site emergency plan optimization. It is recommended that this new method be applied to the risk assessment of multi-unit NPP accident. This new method drastically improves the accuracy of radionuclide concentrations at the locations adjacent to or very close to NPPs. This ML method has a great strength over the COM method when people live near nuclear site, since it provides accurate radionuclide concentrations or radiation doses.