• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2008년도 추계종합학술대회 B
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• pp.632-635
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• 2008

본 논문에서는 LTCC 다층회로 기술을 이용하여 GSM/CDMA 대역을 분리하는 Diplexer를 설계하였다. Diplexer의 집적도를 높이기 위해 3차원 적층형 인덕터와 커패시터를 이용하여 설계되었다. Diplexer는 유전율 7.2인 총 6층의 LTCC 기판에 설계되었고, 설계 되어진 다이플렉서의 크기는 CB-CPW pad를 포함하여 $3,450{\times}4,000{\times}600{\mu}m^3$이다. GSM 대역의 통과 필터는 -0.23dB 이하의 삽입 손실과 -10dB 이하의 반사 손실, CDMA 대역의 통과 필터는 -0.53dB 이하의 삽입 손실과 -10dB 이하의 반사 손실의 특성을 보였다.

• Design & Manufacturing
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• 제11권1호
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• pp.30-33
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• 2017

In this study, the mold technology for manufacturing of porous implant was investigated. Firstly, we considered the concept of insert molding technology with 3D printing of porous inert part. The part on implant was designed in the end region of the implant. And then main implant bodies were manufactured using conventional machining method. The other porous parts were designed and optimized with molding simulation. As the feature size of porous implant was so small that perfect feature of it using 3D printing technology could not be obtained. So, we proposed another scheme for manufacturing of the porous implant in the replace of the former approach. Polymer mold cores with 3D printing technology were considered. The effects of addictive manufacturing process parameters on the properties of mechanical and dimensional accuracy were investigated. Direct 3D printed polymer mold cores were designed and manufactured under the simulation of thermal and molding analysis. It was shown that 3D printed mold core with polymer could be adapted to the injection molding for porous implant.

• 한국기계가공학회지
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• 제14권6호
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• pp.63-68
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• 2015

Recently, 3D printer technologies have been used in many research efforts for high precision manufacturing. In particular, the rapid prototyping technology has been developing rapidly, because it can be manufactured in a short time with a 3D designed shape. This paper relates to the production characteristics of the straight bevel gear designed using a 3D print using the PolyJet method. The characteristics of a 3D printed straight bevel gear were compared with a machined straight bevel gear. The accuracy of the produced straight bevel gear was evaluated by backlash, meshing pattern, face angle, root angle, and surface roughness.

• 한국산학기술학회논문지
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• 제7권1호
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• pp.57-62
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• 2006

본 논문에서는 3D 의복 착의 시뮬레이션에서 사용되는 3D 의복 모델을 제작하는 시스템을 제안한다. 착의 시뮬레이션을 하기 위해서는 3D 인체모델과 3D 의복 모델이 필요하다. 의복 모델을 디자인하기 위해서는 먼저 작업 Matrix 창을 생성하고 디자이너로부터 2D 피스(Piece)를 디자인한다. 디자인된 피스들을 박음질 선을 이용해 연결하고 마지막으로 디자인된 피스와 박음질 데이터를 사용해 수치 데이터를 생성하여 3D 의복 모델을 만든다. 본 논문에서 제안한 시스템에서는 피스 디자인 모듈, 의복 데이터 읽기/저장 모듈, 착의 시뮬레이션 모듈로 이루어져 있다.

• Journal of Information Processing Systems
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• 제17권3호
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• pp.505-517
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• 2021

This research presented an implementation of autostereoscopic virtual three-dimensional (3D) button device as non-contact style. The proposed device has several characteristics about visible feature, non-contact use and artificial intelligence (AI) engine. The device was designed to be contactless to prevent virus contamination and consists of 3D buttons in a virtual stereoscopic view. To specify the button pressed virtually by fingertip pointing, a simple deep learning network having two stages without convolution filters was designed. As confirmed in the experiment, if the input data composition is clearly designed, the deep learning network does not need to be configured so complexly. As the results of testing and evaluation by the certification institute, the proposed button device shows high reliability and stability.

• International Journal of Advanced Culture Technology
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• 제8권3호
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• pp.260-268
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• 2020

Currently, it is usually a 3D scanner processing method as a laser method. However, the laser method has a disadvantage of slow scanning speed and poor precision. Although optical scanners are used as a method to compensate for these shortcomings, optical scanners are closely related to the distance and precision of the object, and have the disadvantage of being expensive. In this paper, 3D scanner using variable focus lens-based structured light module with improved measurement precision was designed to be high performance, low price, and usable in industrial fields. To this end, designed a telecentric optical system based on a variable focus lens and connected to the telecentric mechanism of the step motor and lens to adjust the focus of the variable lens. Designed a connection structure with optimized scalability of hardware circuits that configures a stepper motor to form a system with a built-in processor. In addition, by applying an algorithm that can simultaneously acquire high-resolution texture image and depth information and apply image synthesis technology and GPU-based high-speed structured light processing technology, it is also stable for changes to external light. We will designed and implemented for further improving high measurement precision.

• 전기학회논문지
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• 제59권1호
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• pp.116-119
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• 2010

In this work, we presented the characterization of 3 dB branch type directional couplers by using High-Tc superconducting thin films. To do this, we deposited YBCO superconducting thin films on MgO substrates by using rf-magnetron sputtering techniques. The designed center frequency was 408 MHz and the designed passband was 20 MHz. Also we designed 3 dB Power difference and $90^{\circ}$ of phase difference between port 3 and port 4. The even and odd mode analysis were used to characterize our directional couplers and em Sonnet (full wave analysis program) was utilized to the optimum design. We reported experimental results, including a center frequency, passband, half power characteristics and phase differences. We confirmed that experimental results were in good agreements with characterization by using full wave analysis program.

• 한국의류산업학회지
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• 제19권2호
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• pp.134-139
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• 2017

This study proposes 3D printed shoe designs with patterns made by reinterpreting traditional Korean muntin patterns as customized designs that are unique to individual consumers and different from existing products. In the fashion industry, shoes with diverse designs grafted with 3D printing technology have been introduced. Artistic 3D printed shoes showcase the unique designs of designers. Functional and practical 3D printed shoes that can be worn during daily activities and during exercise have been actively developed. Traditional Korean pattern designs are also being recreated into designs reflecting the aesthetic sense of modern times with our own identity. The uniqueness of the traditional muntin patterns in geometric shapes, such as intersections of lines, rectangles, and octagons, are expressed in shoe designs with modern aesthetic senses by utilizing the traditional patterns that conform well to the modern geometric beauty of forms. This study was intended to develop 3D shoe designs that reinterpreted the motif of muntin patterns from among traditional Korean geometric patterns with a modern aesthetic sense. The octagonal patterns that express the scenery of spring can be seen through the muntins in traditional Korean-style houses were designed on the heels of shoes. Utilizing the Rhino CAD program and ProJet 660 Pro 3D printer, shoes were designed and printed. The processes for making shoes using 3D printing technology proposed in this study are significant because they represent the creation of designs in a new area. The results of this study might help in the development of 3D printed fashion products.

• Journal of information and communication convergence engineering
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• 제17권4호
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• pp.255-260
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• 2019

A pendubot is a representative example of an underactuated system that has fewer actuators than the degree of freedom of the system. In this study, the characteristics of the pendubot are first reviewed; each part is then designed using Solidworks by dividing the pendubot into three parts: the base frame, first link frame, and second link frame. These three parts are then imported into the Simulink environment via a STEP file format, which is the standard protocol used in data exchange between CAD applications. A 3D model of the pendubot is then constructed using Simscape, and the usefulness of the 3D model is validated by a comparison with a dynamic equation derived using the Lagrangian formulation. A linearized model around an upright equilibrium position is finally obtained, and a sliding mode controller is designed based on the linear quadratic regulator. Simulation results showed that the designed controller effectively maintained upright balance of the pendubot in the presence of disturbance.

• 한국정보통신학회논문지
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• 제13권5호
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• pp.877-886
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• 2009

본 논문은 웹 기반 3D 패션몰을 위한 의복 시뮬레이션 시스템의 설계 기법 및 구현 방법에 대해 제한한다. 웹 3D 패션몰은 마우스 조작이 쉬운 Web3D 저작툴인 ISB로 구현하였고, 3D 인체 모델과 의상 아이템 모델은 3D MAX를 이용하여 로폴리곤 모델링으로 제작하였고, 생성된 3D 인체 모델과 의상 아이템 모델을 XML 형식으로 출력시켜 저장한 후, Direct3D를 이용하여 제작된 ActiveX 컨트롤을 사용하여 웹상에서 3D 인체 모델과 의상 아이템 모델의 정합과 애니메이션을 구현하였다. 또한 텍스타일 팔레트를 제작하여 의상 아이템 모델에 맵핑하는 과정을 알파블 렌딩 기법을 적용하여 구현하였다.