• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.11
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• pp.494-500
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• 2020

Owing to the complexity of shapes and elements, some difficulties are found in the modeling and sharing phases in a project at the earlier design stages. This paper extends the boundaries by suggesting the data interoperability between 3D modeling software, McNeel Rhino 3D and BIM system, and Autodesk® Revit® Architecture. The main research methodology is to link the architectural form data in the NURBS supporting the 3DM format, especially for integrating surface properties into the mass family template of Revit. This algorithm-driven interoperability approach using visual programming, such as Dynamo in conjunction with Autodesk®, can be applicable in a theoretical part and also a practical use-case. This paper summarizes these results as sequence guidelines and project template recommendations suggesting an efficient design process to interoperate geometric data with the BIM system to manipulate and control the regular and curved form of office buildings.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.38 no.7
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• pp.637-646
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• 2010

A time-domain panel method based on the potential flow theory and the time-stepping method is developed to predict the steady/unsteady aerodynamic characteristics of FM07, which is the BWB (Blended-wing body) type MAV. In the aerodynamic analyses, we used two types of the initial model(Case I) and the improved model(Case II), which is moved the gravity center toward the rear and has larger aspect ratio. In the steady aerodynamic analyses, it is revealed that improved model has higher lift to drag ratio(L/D) and more stable pitch characteristic than those of the initial model. In the unsteady aerodynamic analyses for sudden acceleration motion similar to the launch phase of MAV, it seemed that there is a rapid increase of the lift coefficient after the launch and unsteady results are good agreed compare with steady results in just a few times. In the analysis for pitch oscillation motion, which is occurred at the cruise condition of the FM07, it shows that unsteady aerodynamic coefficients looped around steady results and the improved model has more sensitive aerodynamic characteristics.

• Journal of KIISE:Software and Applications
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• v.33 no.4
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• pp.418-426
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• 2006

This paper proposes a robust and efficient segmentation method for a cardiac ultrasound image taken from a probe inserted into the heart in surgery. The method consists of three steps: initial boundary extraction, whole boundary modification using confidence competition, and local boundary modification using the rolling spoke method. Firstly, the initial boundary is extracted with threshold regions along the global spokes emitted from the center of an ultrasound probe. Secondly, high confidence boundary edges are detected along the global spokes by competing among initial boundary candidate and new candidates achieved by edge and appearance information. finally, the boundary is modified by rolling local spokes along concave regions that are difficult to extract using the global spokes. The proposed method produces promising segmentation results for the ultrasound cardiac images acquired during surgery.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.34 no.4
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• pp.1299-1306
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• 2014

Recently, there are many roundabouts installation works which are ordered to provide convenient transportation to road users as well as to eliminate traffic accidents and traffic delays. This study propose an approximate construction cost estimation model for early stages of roundabout construction. The model is designed considering the conditions of the early stage roundabout construction sites in Jeju. The regression equation of approximate construction cost was derived through regression analysis of 25 design data of roundabout construction in Jeju, and it was analyzed to have a high prediction accuracy. Finally, results verifies high prediction accuracy of the derived regression equation. Difference between the estimation cost and the design cost was only 2.3%, 3.7%, and 5.8% that verifies the high accuracy of the proposed approximate construction cost estimation model.

• Journal of Digital Contents Society
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• v.18 no.7
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• pp.1347-1356
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• 2017

In order to strengthen the competitiveness of small business startups with insufficient internal and external resources, the government has implemented SMEs consulting support projects. However, as an intangible knowledge service, consulting services also have their own shortcomings such as the risk of time, effort and quality uncertainty. And all kinds of risks will be borne by the companies which receive consulting services. Therefore, many companies which receive consulting services in Korea are questioning the reliability of the consulting results and have a negative attitude on this industry. In addition, they consider the cost-effectiveness of consulting is relatively low. Finally, this study performed an empirical study on recommendation intention of small business startups which received consulting and also focused on the comparison between Korean and Chinese startups.

• Korean Journal of Social Welfare
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• v.62 no.3
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• pp.83-108
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• 2010

This study aims to estimate the trajectory of outpatient medical service use and examine what factors are associated with the trajectory among older adults 60 and over with specific focuses on age variations. Using the first three waves of the Korean Welfare Panel Study data, the trajectory and predictors were examined through the Latent Growth Curve Modeling and age variations were examined through the Multi-group Comparison Analyses. The research model was developed based on the Anderson Model. The results showed that study participants tend to increase outpatient medical service use with years. Individuals 75 or younger presented a much faster increasing rate of medical service use than those 75 and over. Similar to the findings of the previous studies, most predisposing factors, resource factors, and needs factors were found to be associated with the trajectory of outpatient medical service use. Needs factors were more closely associated with the medical service use trajectory than resource factors. With regard to age variations in predictors, few significant age variations were found. Based on the finding of the study, implications and future research directions were discussed.

• 한국벤처창업학회:학술대회논문집
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• 2017.11a
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• pp.19-25
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• 2017

본 연구에서는 창업가의 역량을 주관적 경력성공과 기업가정신으로 설정하여 창업기업의 성과와의 영향관계에 대한 연구를 진행하였다. 특히, 최근 늘어나는 실업율과 정부의 창업지원 정책의 핵심대상군인 청년들을 대상으로 본 연구를 진행하였다. 일반적으로 청년창업이 어려운 이유 중 하나는 시장이나 사업에 대한 경험이 상대적으로 부족한 청년들이 실무적인 지원 및 실패에 대한 안전장치 없이 창업을 시작한다는데 있다. 하지만 창업교육을 통해 간접경험을 높이고 청년들이 가지고 있는 장점인 새로운 시각과 유연한 사고방식을 충분히 활용한다면, 실패에 대한 확률을 줄이고 혁신기업을 만들 수 있는 가능성은 더 높을 수 있다 하겠다. 최근 몇 년간 정부는 대학생을 포함한 청년층에게 창업 초기자금을 지원하여 청년창업의 활성화에 많은 노력을 해왔지만, 이러한 지원들은 대부분 창업을 시작하는 초기단계에 집중이 되어있다. 창업은 그 성공률이 3~4% 남짓으로 쉽지 않은 일이지만, 그래도 이러한 초기단계의 지원들은 청년들이 창업시장에 많은 참여를 할 수 있는 동인이 되고 있다. 또한, 청년들이 시장에서 자신의 아이디어를 실험하고 사업화하며 혁신을 이루어가는 창업의 과정은 훗날 그들에게 훌륭한 경험과 경력이 될 것이다. 경험을 통한 자신의 경력에 대한 주관적인 평가는 개인의 삶과 업무에 대한 태도에 영향을 미치게 되기 때문에, 청년들의 이러한 경험들은 우리사회에 지속으로 긍정적인 가능성을 만들어 줄 것이다. 본 연구는 창업가의 주관적 경력성공과 기업가정신이 창업기업의 성과에 영향을 미치는 요인들을 확인하기 위한 분석을 수행하였다. 이러한 분석을 통해 창업기업들이 성장을 위해서 개인이 가지고 있는 경력과 경험에 대한 활용을 높여야 하는 근거를 도출하였다. 이러한 근거 도출을 위해 창업가의 경력에 대한 중요성과 업무능력과의 관계에서 영향을 주는 요인을 가설로 설정하였고 이에 대한 검증을 통하여 주관적 경력에 대한 중요성을 확인하였다. 본 연구의 주 목적은 첫째, 창업가의 주관적 경력성공과 기업가정신이 경영성과에 미치는 다양한 요인에 대하여 실증 분석하여 학문적 체계를 마련하고, 둘째, 창업가의 주관적 경력성공과 기업가정신이 경영성과에 미치는 요인을 통계적 방법을 통해 찾아내어 창업지원정책의 평가시스템 개발에 유용한 기초자료를 제공하는데 있다.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.36 no.8
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• pp.839-847
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• 2012

Numerical simulations for channel flows with $Re_{\tau}$ = 180, 395 and 590 have been performed to investigate the hairpin packet formation process in wall-bounded turbulent flows. Using direct numerical simulation databases, the initial flow fields are given by the conditionally averaged flow field with the second quadrant event specified at the buffer layer. By tracking the initial vortex development, the change in the initial vortex to an ${\Omega}$-shaped vortex and th generation of a secondary hairpin vortex were found to occur with time scales based on the wall units. In addition, at the time when the initial vortex has grown to the channel center, the inclination angle of the hairpin vortex packet is approximately $12{\sim}14^{\circ}$, which is similar for all three Reynolds numbers. Finally, numerical simulations of the evolution of two adjacent hairpin vortices have been performed to examine the interaction between the adjacent vortex packets.

• Journal of Technology Innovation
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• v.24 no.3
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• pp.139-159
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• 2016

The purpose of this study is to find out the factors which promoting career development of scientist and engineer laborforce. We made up three logit analysis models to figure out the factors affecting the career of scientist and engineer laborforce. Dependent variables were composed of job attributes in 2011, current job attribute, changing of working conditions, efforts of job seeking, university education, and personal characters. Three analysis model were composed of demand side model which including job attributes factors, supply side model which focus on employment or university education characters and total model including the demand and the supply factors. The results showed a stable career to the development of scientist and engineer laborforce's job attributes on the demand side than the supply side, such as a college education even more important. After all, the initial stable jobs and good matching policy were the most important policies to be seated in the science and engineering professions.

• Communications of Mathematical Education
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• v.26 no.4
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• pp.351-362
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• 2012

Until the 1950s, linear algebra was considered only as one of abstract and advanced mathematics subject among in graduate mathematics courses, mainly dealing with module in algebra. Since the 1960s, it has been a main subject in undergraduate mathematics education because matrices has been used all over. In Korea, it was considered as a course only for mathematics major students until 1980s. However, now it is a subject for all undergraduate students including natural science, engineering, social science since 1990s. In this paper, we investigate the early history of linear algebra and its development from a historical perspective and mathematicians who made contributions. Secondly, we explain why linear algebra became so popular in college mathematics education in the late 20th century. Contributions of Chinese and H. Grassmann will be extensively examined with many newly discovered facts.