• 문화기술의 융합
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• 제3권3호
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• pp.37-42
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• 2017

본 연구는 피부의 각질층에 분포되어 있는 유지질의 변화 상태를 조절하는 구조체계에 대해 고안한다. 피부구조에 유지질 성분이 어떻게 진행되는지 형태학으로 구성하였고, 주어진 세포사이와 세포횡단의 조건으로 기계적으로 조절되는 형태를 구성하였으며, 구조적인 기능으로 조절기능의 변화 상태를 확인하였다. 유지질 성분에서 피부의 모형을 구성하여 각층에 따른 유기질 상태의 피부 임피던스를 피부의 측정 임피던스 시스템으로 구성하여 진행하였다. 측정 임피던스는 ${\lambda}-Lip-RSC$, ${\lambda}-Lip-RSL$, ${\lambda}-Lip-CSG$, ${\lambda}-Lip-CSS$ 와 ${\lambda}-Lip-RSB$로 형성하였고, 세포사이와 세포횡단의 조건으로 변화의 차가 있고, 변환을 제어하는 전달시스템을 구성과 변환모델을 세분화하여 구축하였다. 앞으로 유지질 상태에서 피부의 기능적 효능조절이 가능한 유지질 성분의 조절시스템을 구성하여 지속적인 피부의 개선효과가 진행 될 것으로 예상된다.

• 한국건설관리학회논문집
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• 제10권4호
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• pp.101-110
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• 2009

본 연구는 기존 시공단계 중심의 VR시뮬레이션 활용체계를 설계단계까지 확장하여 도로의 최적 설계정보 지원을 위한 시각화 분석 기능을 개발하는 것이 목적이다. 연구에서는 설계지원을 위한 VR기능으로 도보 선형(alignment)에 의한 토공 시뮬레이션, 대안 노선 선정 시뮬레이션 구조물 타입 선정 시뮬레이션 및 지하시설물 분석 시뮬레이션 기능들을 제안하고 있다. 이러한 VR시뮬레이션 기능을 통해 노선 및 토공 상태의 시각적 확인이 가능하고, 대안 노선의 가상적인 모의 배치를 수행함으로써 최적 설계노선을 선정할 수 있다. 이를 위해 본 연구에서는 도로설계정보 지원을 위한 VR시뮬레이션 기능 개발 방법론 및 시스템(VR Presenter)을 구현하며, VR기능을 적용한 개선된 도로설계 프로세스를 제안하고 있다.

• Structural Engineering and Mechanics
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• 제88권4호
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• pp.323-334
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• 2023

The submerged floating tunnel (SFT) infrastructure has been regarded as an emerging technology that efficiently and safely connects land and islands. The SFT route problem is an essential part of the SFT planning and design phase, with significant impacts on the surrounding environment. This study aims to develop an optimization model considering transportation and structure factors. The SFT routing problem was optimized based on two objective functions, i.e., minimizing total travel time and cumulative strains, using NSGA-II. The proposed model was applied to the section from Mokpo to Jeju Island using road network and wave observation data. As a result of the proposed model, a Pareto optimum curve was obtained, showing a negative correlation between the total travel time and cumulative strain. Based on the inflection points on the Pareto optimum curve, four optimal SFT routes were selected and compared to identify the pros and cons. The travel time savings of the four selected alternatives were estimated to range from 9.9% to 10.5% compared to the non-implemented scenario. In terms of demand, there was a substantial shift in the number of travel and freight trips from airways to railways and roadways. Cumulative strain, calculated based on SFT distance, support structure, and wave energy, was found to be low when the route passed through small islands. The proposed model helps decision-making in the planning and design phases of SFT projects, ultimately contributing to the progress of a safe, efficient, and sustainable SFT infrastructure.

• 한국세라믹학회지
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• 제40권12호
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• pp.1159-1164
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• 2003

Two processing routes (i.e., the gel casting and polymer preform routes) using polymer beads were studied to fabricate porous ceramics with a cellular structure. The gel casting route, comprising the gel casting of a ceramic slurry mixed with polymer beads, was found to be inadequate to produce porous ceramic bodies with a interconnected pore structure, due to complete coating of the slurry on the polymer beads, which left just isolated pores in the final sintered bodies. The polymer preform route, involving the infiltration of a polymer beads preform with the ceramic slurry, successfully produced porous ceramics with a highly interconnected network of spherical pores. The pore size of 250-300 $\mu\textrm{m}$ was demonstrated and the porosity ranged from 82 to 86%. This process is advantageous to control the pore size because it is determined by the sizes of polymer beads used. Another feature is the avoidance of hollow skeleton, giving a high strength.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.783-785
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• 2003

In recent years, the use of video in GIS is considered to be an important subject and many related studies result in VideoGIS. The virtual navigation is an important function that can be applied to various VideoGIS applications. For virtual navigation by video, the following problems must be solved. 1) Because the video route may be not exactly coincided with route that user wants to navigate, parts of several video clips may be required for single navigation. Virtual navigation should allow the user to move from one video to another at the proper position. We suggest the video segmentation method based on geographic data combined with video. 2) From a point to a destination, the change frequency of video must be minimized. The frequent change of video make user to mislead navigation route and cause the wasteful use of computing resource. We suggest methods that structure video segments and calculate weight value of each node and link.

• 한국정보통신학회논문지
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• 제23권11호
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• pp.1371-1376
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• 2019

구조물에서 화재 발생 시 화재의 발생 위치를 정확하게 파악하지 못해 화재 진압이 용이하지 못하는 문제, 연기나 유독가스로 시야 확보가 어려운 상태에서 비상구 및 탈출로에 대한 정보를 방향지시기와 LED 유도등에 의존하여 위험에 빠지는 문제가 빈번히 발생하고 있다. 이에 본 논문에서는 딥러닝 기반(RNN) 구조물 재난 시 최적의 대피로를 안내할 수 있는 시스템 알고리즘을 제시한다. 설치되어 있는 감지 센서를 이용하고, 센서별 검출된 데이터를 서버로 실시간 전송되며, 감지 센서 주변의 온도, 열, 연기, 유독가스 등의 정보가 전달된다. 그리고 이를 분석하고, 설정된 임계치 범위 내에 있는 가장 안전한 이동 경로를 파한다. 이때 구조물 내에 있는 LED 유도등과 방향지시기에 실시간으로 정보를 전달하여 위험 요소를 피할 수 있는 서비스를 제공해 준다. 이는 구조물의 각 구역별 온도, 열, 연기, 유독가스의 정보를 파악할 수 있어, 구조물 재난 시 최적의 대피로를 안내받을 수 있을 것이라고 사료된다.

• 전기학회논문지
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• 제63권1호
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• pp.115-122
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• 2014

Mobile robot has been studied for long time due to its simple structure and easy modeling. Regarding path planning of the mobile robot, we suggest real-time hybrid path planning algorithm which is the combination of optimal path planning and real-time path planning in this paper. Real-time hybrid path planning algorithm modifies, finds best route, and saves calculating time. It firstly plan the route with real-time path planning then robot starts to move according to the planned route. While robot is moving, update the route as the best outcome which found by optimal path planning algorithm. Verifying the performance of the proposed method through the comparing real-time hybrid path planning with optimal path planning will be done.

• 한국분말재료학회지
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• 제16권6호
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• pp.403-409
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• 2009

Plasma spray forming is recently explored as a near-net-shape fabrication route for ultra-high temperature metals and ceramics. In this study, monolithic tungsten has been produced using an atmospheric plasma spray forming and subsequent high temperature sintering. The spray-formed tungsten preform from different processing parameters has been evaluated in terms of metallurgical aspects, such as density, oxygen content and hardness. A well-defined lamellae structure was formed in the as-sprayed deposit by spreading of completely molten droplets, with incorporating small amounts of unmelted/partially-melted particles. Plasma sprayed tungsten deposit had 84-87% theoretical density and 0.2-0.3 wt.% oxygen content. Subsequent sintering at 2500$^{\circ}C$ promoted the formation of equiaxed grain structure and the production of dense preform up to 98% theoretical density.

• Bulletin of the Korean Chemical Society
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• 제34권5호
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• pp.1388-1390
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• 2013

Macroporous $SnO_2$ foam was successfully synthesized via a simple soft-chemical route by hybridization between alkylamine and tin(IV) oxide. According to X-ray diffraction (XRD) analysis, the as-prepared $SnO_2$ foam had a highly ordered lamella structure along the crystallographic c-axis, which transformed to a rutile phase after thermal treatment at $300^{\circ}C$. X-ray absorption spectroscopy (XAS) at the Sn K-edge revealed that $SnO_2$ particles in the hybrid material maintained their nanosized structure after hybridization with alkylamine. Scanning electron microscope (SEM) images clearly showed that the as-prepared $SnO_2$ foam had a macroporous structure. This synthetic route can be extended to the development of open frameworks with good electrochemical properties in battery applications.

• 대한금속재료학회지
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• 제49권2호
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• pp.128-136
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• 2011

Equal channel angular pressing (ECAP) with intermediate heat treatment was employed to optimize the strength of Cu-15 wt.%Ag. Changes in microstructure, electrical properties and mechanical properties were studied as a function of pressing methods and heat treatment. ECAPed Cu-15wt.%Ag exhibited ultrafine-grained microstructures with the shape and distribution of Ag-rich lamellae dependent on the processing routes. For route A in which the sample was pressed without rotation between each pass, the initial dendrites of Ag-rich phase were elongated along the shear direction and developed into elongated filaments. For route C in which the sample was rotated by 180 degree after each pass, the morphology of initial dendrites of Ag-rich phase was not much modified and the networked structure remained even after 8 passes of ECAP. For route Bc in which the sample was rotated by 90 degree after each pass, the initial dendrites became finer by fragmentation with no pronounced change of the shape and distribution of Ag-rich lamellae. The strength of Cu-15wt.%Ag ECAPed using route Bc was found to be greater than those ECAPed using route A, suggesting that the substructural strengthening is more effective in strengthening than the interface strengthening.