• Journal of the Korea Convergence Society
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• v.4 no.1
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• pp.15-20
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• 2013

Game engines that allow you to reuse the necessary software components in the development of the game. There are representative game engines such as unreal engine, cry engine, unity3D engine. This paper describes recent game engine technologies, discuss next game engine trend focused on those game engines. And then, proposes educational methods on game production.

• The Journal of the Korea Contents Association
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• v.12 no.12
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• pp.1-13
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• 2012

3D video is regarded as the next generation contents in numerous applications. The 2D-to-3D video conversion technologies are strongly required to resolve a lack of 3D videos during the period of transition to the full ripe 3D video era. In 2D-to-3D conversion methods, after the depth image of each scene in 2D video is estimated, stereoscopic video is synthesized using DIBR (Depth Image Based Rendering) technologies. This paper proposes a novel depth fusion algorithm that integrates multiple depth cues contained in 2D video to generate stereoscopic video. For the proper depth fusion, it is checked whether some cues are reliable or not in current scene. Based on the result of the reliability tests, current scene is classified into one of 4 scene types and scene-adaptive depth fusion is applied to combine those reliable depth cues to generate the final depth information. Simulation results show that each depth cue is reasonably utilized according to scene types and final depth is generated by cues which can effectively represent the current scene.

• Journal of the Institute of Convergence Signal Processing
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• v.2 no.2
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• pp.68-74
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• 2001

A design and implementation method for the UHF-band(800MHz) variable attenuator using the 3dB coupler is proposed. The 90 degree, 3-dB Coupler is used for the variable attenuator. The principal theory for the 3-dB coupler is introduced. The 3-dB Coupler is designed by the mathematical analysis and a computer simulation tool. A PIN diode is used for the variable resistor at UHF-band. The variable attenuator using the 3-dB coupler and the PIN diode is designed and implemented. The measured results for the variable attenuator by a network analyzer show that the insertion loss is below -l0dB, and the continuous variable attenuation range is about 10dB.

• Journal of Broadcast Engineering
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• v.19 no.6
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• pp.866-876
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• 2014

Generating of digital hologram of video contents with computer graphics(CG) requires natural fusion of 3D information between real and virtual. In this paper, we propose the system which can fuse real-virtual 3D information naturally and fast generate the digital hologram of fused results using multiple-GPUs based computer-generated-hologram(CGH) computing part. The system calculates camera projection matrix of RGB-Depth camera, and estimates the 3D information of virtual object. The 3D information of virtual object from projection matrix and real space are transmitted to Z buffer, which can fuse the 3D information, naturally. The fused result in Z buffer is transmitted to multiple-GPUs based CGH computing part. In this part, the digital hologram of fused result can be calculated fast. In experiment, the 3D information of virtual object from proposed system has the mean relative error(MRE) about 0.5138% in relation to real 3D information. In other words, it has the about 99% high-accuracy. In addition, we verify that proposed system can fast generate the digital hologram of fused result by using multiple GPUs based CGH calculation.

• The Journal of Korean Institute for Practical Engineering Education
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• v.4 no.2
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• pp.53-59
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• 2012

This article reviews the current issues of engineering education: engineering creativity, R&D 3.0 and Education 3.0 and comfirms need of refining quality of engineering education through learner-centered hybrid project learning. this article suggests the Global engineering project(GEP) program as an ideal hybrid project learning model that develop student's creativity and convergence capability. GEP program is learnner-centered interdisciplinary program that whole processes are managed by interdisciplinary students team aiming to global engineers who are globally competent and locally relevant so that they can function effectively in any country by local activity in developing country. The program consist of four main parts: 1)pre activity, 2)local activity from abroad, 3)design and producing prototype and 4)participating in the design contest or academic conference with the products. As a result, students' global competence, teamwork skill and capability of creative problem solving are remarkably improved.

• Information and Communications Magazine
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• v.25 no.1
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• pp.25-31
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• 2008

사회변혁 과정에서 경쟁우위 확보는 그 시대를 대표하는 기술의 습득과 활용의 정도에 따라 좌우된다. 우리나라의 경우 정보혁명 과정에서 IT기술의 습득과 활용을 위하여 적극적인 노력을 기울인 결과 IT강국이라는 현재의 위치를 확보할 수 있게 되었다. 그러나, 최근들어 IT산업이 국가의 경제발전을 지속적으로 선도하여 나가기 위해서는 IT 산업내의 구조적 취약점을 해결해야 한다는 지적과 함께 참여정부에서 시작된 IT39 중심의 산업정책에 대한 비판도 제기되고 있다. 이에 따라 사회변화의 방향을 가늠해 보고 우리 IT산업이 직면한 문제 분석과 이를 토대로 한 새로운 IT R&D 방향을 모색할 필요가 있다. 미래사회 변화의 큰 특징은 융합으로 대변된다. 정보처리 기술과 통신기술의 융합으로 시작된 이 흐름은 최근 통방융합이라는 차원을 넘어 이종기술간 및 이종산업간 융합이라는 개념으로 확장 진화되고 있다. 또한, 사회변혁의 패러다임도 지식기반사회에서 융합시대로 급격히 전환되고 있다. 융합이라는 패러다임 변혁의 물결에 편승하기 위해서는 IT기술이 융합시대에서 어떠한 역할을 하고, 어떻게 진화해 갈 것인지를 규명하는 작업이 필요하다. IT기술은 그동안의 혁신적 발전을 기반으로 여타 기술 및 산업 발전을 견인하는 원천기술로 작용할 것이 확실시 된다. 따라서, 융합시대에서 IT기술은 기존의 독자적 산업영역에 국한되지 않고 새로운 기술과 산업으로 그 응용범위가 대폭 확장됨으로써 기존에 IT가 지녔던 기술적, 산업적 중요 성과는 비교할 수 없을 정도의 의미를 지니게 될 것이다. 융합시대에 대응하여 IT R&D 방향을 검토하는 전략적 의미도 여기에서 찾을 수 있게 된다. 융합시대에서 IT R&D는 IT가 여타 기술 및 산업발전을 위한 원천기술화를 비롯하여 (1) 유비쿼터스 인프라, (2) 디지털 인텔리전스, (3) 융합부품, (4) 메가 컨버전스 등과 같은 4대 동력에 집중할 필요가 있다. IT의 원천기술화 및 4대 동력에의 집중이야말로 융합시대를 슬기롭게 열어가는 '전략적 창(strategic window)‘이 될 것이다.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.20 no.7
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• pp.89-96
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• 2021

In this study, a mini hydro cyclone was designed and manufactured to achieve an inlet flow rate of 2 L/min in the experiment, which was conducted using alumina powder with a specific gravity of 3.97. This hydro cyclone was studied for using in steam and water analysis system (SWAS) of thermal power plant and was manufactured by 3D printing. Numerical analysis was performed with Solidworks Flow Simulation, utilizing the reynolds stress method (RSM) of fluid multiphase flow analysis models. Experimental and numerical analysis were performed under the three conditions of inlet velocity 2.0, 4.0, and 6.0 m/s. The separation efficiency was over 80% at all inlet velocity conditions. At the inlet velocity 4m/s, the separation efficiency was the best, and it was confirmed that the efficiency was more than 90%.

• Journal of the Korean Society of Industry Convergence
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• v.23 no.2_1
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• pp.107-113
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• 2020

Additive manufacturing(AM) can create complex shapes directly in 3D CAD models with internal geometry compared to conventional subtraction manufacturing. AM technology has the advantage of adopting various materials as well as the reduction of material. However, the high cost of AM is still a significant barrier preventing the wider adoption of AM in industries. This paper analyzes the technical application cases for solving these entry barriers and proposes a bi-metal 3D printing technology as an anticipated application to overcome the difficulty. The paper investigates the complications for current 3D metal printing technology to conduct bi-metal 3D printing and addresses ongoing solution research based on laser technology.

• Journal of the Korean Society of Industry Convergence
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• v.26 no.6_1
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• pp.977-983
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• 2023

The tank uses a twin turbo diesel engine equipped with two turbocharger systems for high output. The main component of the turbocharger system is the turbine housing through which the exhaust flows. Turbine housing is manufactured through a sand casting process, taking into account the shape and material characteristics according to the environmental conditions in which it is used. Currently, turbine housing is imported, and local production is necessary. In this study, basic research was conducted to localize the turbine housing of a tank diesel turbo engine. Reverse engineering and finite element analysis of the imported turbine housing were performed. The prototype of the turbine housing was printed using FDM and PBF 3D printers. The prototype of the turbine housing printed with an FDM 3D printer has an overall appearance similar to 3D modeling, but the printed surface of the whorl part is rough. The prototype printed with the PBF 3D printer is completely identical to the 3D modeling, including the whorl part.

• Journal of Broadcast Engineering
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• v.26 no.5
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• pp.553-565
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• 2021

Point cloud is a set of points for representing a 3D object, and consists of geometric information, which is 3D coordinate information, and attribute information, which is information representing color, reflectance, and the like. In this way of expressing, it has a vast amount of data compared to 2D images. Therefore, a process of compressing the point cloud data in order to transmit the point cloud data or use it in various fields is required. Unlike color information corresponding to all 2D geometric information constituting a 2D image, a point cloud represents a point cloud including attribute information such as color in only a part of the 3D space. Therefore, separate processing of geometric information is also required. Based on these characteristics of point clouds, MPEG under ISO/IEC standardizes V-PCC, which imitates point cloud images and compresses them into 2D DCT-based 2D image compression codecs, as a compression method for high-density point cloud data. This has limitations in accurately representing 3D spatial information to proceed with compression by converting 3D point clouds to 2D, and difficulty in processing non-existent points when utilizing 3D DCT. Therefore, in this paper, we present 3D Discrete Cosine Transform-based Point Cloud Compression (3DCT PCC), a method to compress point cloud data, which is a 3D image by utilizing 3D DCT, and confirm the efficiency of 3D DCT compared to V-PCC based on 2D DCT.