• 한국전기전자재료학회논문지
• /
• 제15권10호
• /
• pp.889-895
• /
• 2002

Wafer level packaging is gain mote momentum as a low cost, high performance solution for RF-MEMS devices. In this work, the flip-chip method was used for the wafer level packaging of RF-MEMS devices on the quartz substrate with low losses. For analyzing the EM (electromagnetic) characteristic of proposed packaging structure, we got the 3D structure simulation using FEM (finite element method). The electric field distribution of CPW and hole feed-through at 3 GHz were concentrated on the hole and the CPW. The reflection loss of the package was totally below 23 dB and the insertion loss that presents the signal transmission characteristic is above 0.06 dB. The 4-inch Pyrex glass was used as a package substrate and it was punched with air-blast with 250${\mu}{\textrm}{m}$ diameter holes. We made the vortical feed-throughs to reduce the electric path length and parasitic parameters. The vias were filled with plating gold. The package substrate was bonded with the silicon substrate with the B-stage epoxy. The loss of the overall package structure was tested with a network analyzer and was within 0.05 dB. This structure can be used for wafer level packaging of not only the RF-MEMS devices but also the MEMS devices.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제18권2호
• /
• pp.311-326
• /
• 2024

The rapid development of neural network technology promotes the neural network model driven by big data to overcome the texture effect of complex objects. Due to the limitations in complex scenes, it is necessary to establish custom template matching and apply it to the research of many fields of computational vision technology. The dependence on high-quality small label sample database data is not very strong, and the machine learning system of deep feature connection to complete the task of texture effect inference and speculation is relatively poor. The style transfer algorithm based on neural network collects and preserves the data of patterns, extracts and modernizes their features. Through the algorithm model, it is easier to present the texture color of patterns and display them digitally. In this paper, according to the texture effect reasoning of custom template matching, the 3D visualization of the target is transformed into a 3D model. The high similarity between the scene to be inferred and the user-defined template is calculated by the user-defined template of the multi-dimensional external feature label. The convolutional neural network is adopted to optimize the external area of the object to improve the sampling quality and computational performance of the sample pyramid structure. The results indicate that the proposed algorithm can accurately capture the significant target, achieve more ablation noise, and improve the visualization results. The proposed deep convolutional neural network optimization algorithm has good rapidity, data accuracy and robustness. The proposed algorithm can adapt to the calculation of more task scenes, display the redundant vision-related information of image conversion, enhance the powerful computing power, and further improve the computational efficiency and accuracy of convolutional networks, which has a high research significance for the study of image information conversion.

• 한국콘텐츠학회논문지
• /
• 제11권11호
• /
• pp.120-129
• /
• 2011

본 연구의 목적은 3D 입체영상 라이드 필름에서 발현되는 사용자 감성을 규명하기 위하여 대표감성어휘를 도출하고 이들 간의 구조를 파악하는 것이다. 이를 위하여 감성관련 선행 연구를 고찰하고 3D 입체영상에 적합한 감성어휘를 수집하였다. 그 결과 206개 기초감성 어휘가 수집되었으며 이에 대하여 62명의 일반 사용자와 4명의 전문가에 의한 적절성 평가를 실시하였다. 이를 통해 77개의 감성어휘 후보를 선발 하였으며 단어 유사성을 배재하여 26개의 대표감성 어휘 후보를 선발하였다. 이를 기초로 자유연상 기법을 활용해 최종 15개의 대표감성어휘를 도출하고 감성어휘 간의 구조를 파악 할 수 있었다. 기존 감성에 대한 연구가 정지된 대상이라면 본 연구는 움직임에 대한 감성으로서 감각, 감정을 포함한 감성연구를 제안하며 향후 3D입체영상의 감성공간과 감성효과에 대한 연구로 이어질 것이다. 본 연구는 3D 입체영상 라이드 필름을 제작할 때 기초가 되는 디자인 지침을 제공할 것으로 기대된다.

• 한국의류산업학회지
• /
• 제25권5호
• /
• pp.549-559
• /
• 2023

Along with the transition to the fourth industrial revolution, the possibility of metaverse-based innovation in the fashion field has been confirmed, and various applications are being sought. Therefore, this study performs meaning structure analysis and discusses the prospects of meta fashion using big data. From 2020 to 2022, data including the keyword "metaverse + fashion design" were collected from portal sites (Naver, Daum, and Google), and the results of keyword frequency, N-gram, and TF-IDF analyses were derived using text mining. Furthermore, network visualization and CONCOR analysis were performed using Ucinet 6 to understand the interconnected structure between keywords and their essential meanings. The results were as follows: The main keywords appeared in the following order: fashion, metaverse, design, 3D, platform, apparel, and virtual. In the N-gram analysis, the density between fashion and metaverse words was high, and in the TF-IDF analysis results, the importance of content- and technology-related words such as 3D, apparel, platform, NFT, education, AI, avatar, MCM, and meta-fashion was confirmed. Through network visualization and CONCOR analysis using Ucinet 6, three cluster results were derived from the top emerging words: "metaverse fashion design and industry," "metaverse fashion design and education," and "metaverse fashion design platform." CONCOR analysis was also used to derive differentiated analysis results for middle and lower words. The results of this study provide useful information to strengthen competitiveness in the field of metaverse fashion design.

• 대한원격탐사학회:학술대회논문집
• /
• 대한원격탐사학회 1998년도 Proceedings of International Symposium on Remote Sensing
• /
• pp.153-158
• /
• 1998

Since the mid-1990′s, researches on 3D GIS have been regarded as one of main issues both in the academic sites and commercial vendors; recently, some prototyped systems or the first versioned software systems of commercial basis are being reported and released. Unlike conventional 2D GIS, which consists in intelligent structured GIS or desktop GIS, every 3D GIS has its own distinguished features according to data structure-supporting capability, GIS-styled functionality, external database accessibility, interfacing extents with 2D GIS, 3D visualization/texture mapping ability, and so forth. In this study, technical aspects related to system development, SERI-Web3D GIS ver. 1.2, are explained. Main features in this revised 3D GIS can be summarized: 2-tier system model(client-server), VGFF(Virtual GIS File Format), internal GIS import, Feature manager(zoning, layering, visualization evironment), Scene manager(manage 3D geographic world), Scene editor, Spatial analyzer(Intersect, Buffering, Network analysis), VRML exporter. While, most other 3D GISes or cartographic mapping systems may be categorized into 3D visualization systems handling terrain height-field processing, 2D GIS extension modules, or 3D geometric feature generation system using orthophoto image: actually, these are eventually considered as several parts of "real 3D GIS". As well as these things, other components, especially web-based 3D GIS, are being implemented in this study: Surface/feature integration, Java/VRML linkage, Mesh/Grid problem, LOD(Level of Detail)/Tiling, Public access security problem, 3-tier architecture extension, Surface handling strategy for VRML.

• 한국전자통신학회논문지
• /
• 제18권6호
• /
• pp.1015-1022
• /
• 2023

본 논문에서는 4.7 GHz 특화망 대역에 적용할 수 있는 개구결합 급전을 갖는 이중 선형편파 안테나를 제안하였다. 제안된 안테나는 격리도 향상을 위해 일반적인 개구 결합급전을 갖고 상층과 하층에 각각 급전점을 갖도록 설계하였다. 각각의 기판의 크기는 34.0 mm×34.0 mm (W×L)이며 두께(h) 1.0 mm, 그리고 비유전율이 4.4인 FR-4 기판을 사용하였다. 또한 상층의 윗면에 12.7 mm×14.6 mm (W2×L3)의 패치를, 하층의 아랫면에 24.0mm×1.6 mm의 급전선로를, 접지면에 1.0 mm×7.7 mm(S×T)의 크기를 갖는 슬롯을 설계하여 패치로 급전되도록 하였다. 제작 및 측정 결과로부터, -10 dB 반사손실을 기준으로 배열 안테나의 경우, 입력포트 1에서 300.0 MHz (4.52~4.82 GHz), 입력포트 2에서 170.0 MHz (4.65~4.82 GHz)의 대역폭을 얻었으며 전달계수 S21은 -30 dB 이하의 값을 얻었다. 또한 각 급전포트에서의 편파분리도를 얻었다.

• 한국항행학회논문지
• /
• 제27권2호
• /
• pp.182-189
• /
• 2023

깊이 추정은 차량, 로봇, 드론의 자율주행을 위한 3차원 지도 생성의 핵심 기술이다. 기존의 센서 기반 깊이 추정 방식은 정확도는 높지만 가격이 비싸고 해상도가 낮다. 반면 카메라 기반 깊이 추정 방식은 해상도가 높고 가격이 저렴하지만 정확도가 낮다. 본 연구에서는 무인항공기 카메라의 깊이 추정 성능 향상을 위해 Self-Attention 기반의 비지도 단안 카메라 영상 깊이 추정을 제안한다. 네트워크에 Self-Attention 연산을 적용하여 전역 특징 추출 성능을 향상시킨다. 또한 카메라 파라미터를 학습하는 네트워크를 추가하여 카메라 칼리브레이션이 안되어있는 이미지 데이터에서도 사용 가능하게 한다. 공간 데이터 생성을 위해 추정된 깊이와 카메라 포즈는 카메라 파라미터를 이용하여 포인트 클라우드로 변환되고, 포인트 클라우드는 Octree 구조의 점유 그리드를 사용하여 3D 맵으로 매핑된다. 제안된 네트워크는 합성 이미지와 Mid-Air 데이터 세트의 깊이 시퀀스를 사용하여 평가된다. 제안하는 네트워크는 이전 연구에 비해 7.69% 더 낮은 오류 값을 보여주었다.

• 한국측량학회:학술대회논문집
• /
• 한국측량학회 2004년도 춘계학술발표회논문집
• /
• pp.485-490
• /
• 2004

Recently, distribution transfer velocity was extremely lowered by high supply rate of vehicle and low road rate. Therefore expansions of transfer network these were subway, road and railway to recover competitive power as a reform measure of physical distribution traffic were become preference previous subject. For reason of that, an expansion of transfer network is meeting competitive power as selected an elevated road in the ground road network that condition of location calm and get out of the existing urban than the underground road to connect oversensitive a large city and expanded small and medium satellite town. In the meantime, while elevated structures construct, they go through the civilian residential section, agriculture land, etc. The consequence is that it raises a vibration, noise, dust, an infringement of the right to a view and an infringement of the right to a sunshine. In this study, we analyzed Quantitatively sunshine quantity with building 3D simulation model of civil structure. Therefore, we present as planning data to reduce a civilian appeal for dispute of the right to sunshine and an economic and time loss between the government and construction company In addition to that, for the standard of the standard plan of usable sunshine quantity program in the practical business, the building of convenient user interface will be the project to be done.

• IEIE Transactions on Smart Processing and Computing
• /
• 제3권5호
• /
• pp.325-330
• /
• 2014

The era of convergence is being applied to all areas of Information and Communication Technology (ICT). The convergence of broadcasting service and communication service almost occurs on smart devices including smartphone. The smart hybrid Digital Multimedia Broadcasting (DMB) is a typical example of the convergence of broadcasting and wireless communication service. The hybrid mobile broadcasting service can support seamless video, 3D, high quality, and additional data services based on network connection between the broadcasting and wireless network. The gateway and terminal (including apps on the smartphone) take the role of the main components on the hybrid service. This paper presents the service concept, main components structure, the implementation of gateway and terminals, and field test to the urban areas for the mobile hybrid system.

• 센서학회지
• /
• 제20권3호
• /
• pp.145-150
• /
• 2011

In this paper, we designed a tunable microstrip patch antenna using RF MEMS switches. The design and simulation of the antenna were performed using a high frequency structure simulator(HFSS). The antenna was designed for use in the ISM band and either operates at 2.4 GHz or 5.7 GHz achieving -10 dB return-loss bandwidths of 20 MHz and 180 MHz, respectively. In order to obtain high efficiency and improve the ease of integration, a high resistivity silicon(HRS) wafer on a glass substrate was used for the antenna. The antenna achieved high gains: 8 dB at 5.7 GHz and 1 dB at 2.4 GHz. The RF MEMS DC contact switches were simulated and analyzed using ANSYS software.