• 한국정보과학회논문지:소프트웨어및응용
• /
• 제41권7호
• /
• pp.501-517
• /
• 2014

이진 변환은 특정 장치에서 동작하도록 구성된 프로그램을 다른 장치에서 동작할 수 있도록 재구성하는 과정을 말한다. 이진 변환을 수행하기 위해서는 두 장치 사이의 변환 규칙을 생성하는 것이 매우 중요하다. 변환 규칙을 생성하는 방법은 직접 매핑과 간접 매핑으로 나뉜다. 직접 매핑은 성능을 위한 방법인 반면, 간접 매핑은 재목적성을 위한 방법이다. 본 논문에서는 임베디드 시스템에 적합한 직접 매핑 기반의 이진 변환을 수행한다. 그렇지만 재목적성 역시 중요한 요구사항이기 때문에, 재목적성을 고려한 직접 매핑 기반의 이진 변환 방법을 제안한다. 또한 제안된 방법을 바탕으로 자동으로 변환 규칙을 생성하는 도구를 구현한다. 이 방법을 통해서 성능과 재목적성을 모두 고려한 변환 규칙을 생성할 수 있으며, 더 나아가 이진 변환을 수행하는데 소요되는 비용을 줄일 수 있다.

• 한국언어정보학회지:언어와정보
• /
• 제10권1호
• /
• pp.71-91
• /
• 2006

The linguistic characteristics of a sign language provide an important clue for an automatic construction of its expression from a given natural language sentence. For such characterization, we focus on the identification of elided constituents, the mapping of property-changing information into spatio-temporal dimension, and the need for rearranging the order of component information for enhanced quality of delivery. We use our characterization to implement a system that converts sentences in Korean into corresponding expressions in the Korean Sign Language.

• 대한의용생체공학회:학술대회논문집
• /
• 대한의용생체공학회 1995년도 추계학술대회
• /
• pp.86-89
• /
• 1995

A clinically oriented 32 channel Electroencephalogram (EEG) and evoked potential (EP) mapping system has been developed. The EEG and EP signals acquired from 32-channel electrodes are amplified by the pre-amplifier located near patient and are then tither amplified by main amplifier. An automatic artifact rejection scheme is employed using a neural network by which examination time is reduced substantially. Auditary and visual stimuli are used for the evoked potential mapping. A user-friendly graphical interface based on the Microsoft Window 3.1 is developed for the operation of the system. Statistical databases for the poop and individual comparisons are also included to support statistically based diagnosis.

• 대한기계학회논문집B
• /
• 제23권6호
• /
• pp.703-712
• /
• 1999

This paper suggests an automatic elliptic grid generation method that is well-suited for the numerical mapping of complex geometries which are easily obtained from general CAD programs. An LBLADI solver is used for the governing mapping equations to have the strong diagonal dominance. The full boundary control method is adopted to determine the control functions of the equations, which allows the control of the grid regarding spacing and angle control at all boundary surfaces. The solution method presented here provides the capability of mapping very complicated geometries by defining grid point locations only along the boundaries. In the automated elliptic grid generation procedure, it is showed that strong diagonal dominance is essential to achieve successful mapping irrespective of the initial grid condition provided. To demonstrate the robustness of this method, it is applied to the thermal flow like the natural convection between eccentric cylinders. The results agree well with others.

• 대한원격탐사학회:학술대회논문집
• /
• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
• /
• pp.744-746
• /
• 2003

A 3D modeling of urban area can be composed the terrain modeling that can express specific and shape of the terrain and the object modeling such as buildings, trees and facilities which are found in urban areas. Especially in a 3D modeling of building, it is very important to make a unit model by simplifying 3D structure and to take a texture mapping, which can help visualize surface information. In this study, the texture mapping technique, based on library for 3D urban modeling, was used for building modeling. This technique applies the texture map in the form of library which is constructed as building types, and then take mapping to the 3D building frame. For effectively apply, this technique, we classified buildings automatically using LiDAR data and made 3D frame using LiDAR and digital map. To express the realistic building texture, we made the texture library using real building photograph.

• Restorative Dentistry and Endodontics
• /
• 제38권3호
• /
• pp.146-153
• /
• 2013

Objectives: Aluminum step wedge (ASW) equivalent radiodensity (eRD) has been used to quantify restorative material's radiodensity. The aim of this study was to evaluate the effects of image acquisition control (IAC) of a digital X-ray system on the radiodensity quantification under different exposure time settings. Materials and Methods: Three 1-mm thick restorative material samples with various opacities were prepared. Samples were radiographed alongside an ASW using one of three digital radiographic modes (linear mapping (L), nonlinear mapping (N), and nonlinear mapping and automatic exposure control activated (E)) under 3 exposure time settings (underexposure, normal-exposure, and overexposure). The ASW eRD of restorative materials, attenuation coefficients and contrasts of ASW, and the correlation coefficient of linear relationship between logarithms of gray-scale value and thicknesses of ASW were compared under 9 conditions. Results: The ASW eRD measurements of restorative materials by three digital radiographic modes were statistically different (p = 0.049) but clinically similar. The relationship between logarithms of background corrected grey scale value and thickness of ASW was highly linear but attenuation coefficients and contrasts varied significantly among 3 radiographic modes. Varying exposure times did not affect ASW eRD significantly. Conclusions: Even though different digital radiographic modes induced large variation on attenuation of coefficient and contrast of ASW, E mode improved diagnostic quality of the image significantly under the underexposure condition by improving contrasts, while maintaining ASW eRDs of restorative materials similar. Under the condition of this study, underexposure time may be acceptable clinically with digital X-ray system using automatic gain control that reduces radiation exposure for patient.

• 한국지리정보학회지
• /
• 제21권1호
• /
• pp.1-11
• /
• 2018

MMS(Mobile Mapping System) 자료를 이용한 정밀 공간 정보 매핑은 고정밀 3차원 지형 모델 구축, 시설물 관리를 위해 중요하며, 특히 도로 중앙선 매핑 작업은 정밀 도로 지도 구축을 위해 필요하다. 본 연구에서는 MMS LiDAR(Light Detection And Ranging) 자료를 이용하여 정밀 공간 정보인 도로 중앙선을 매핑 하는 반자동화 방법을 개발하였다. 우선 주어진 MMS LiDAR 자료를 기반으로 보간법을 이용하여 반사강도 영상을 제작하고, 에지 검출기를 이용하여 반사강도 영상으로부터 선형 세그먼트들을 추출하였다. 최종적으로 추출된 선형 세그먼트들 중에서 도로 중앙선 세그먼트를 수동으로 선택하였다. 추출된 도로 중앙선의 정확도 검증 결과, 0.065m의 정확도를 보여주었으며, 도로 중앙선이 도로 신호와 인접한 일부 지역에서 에러가 발견되었다.

• 한국멀티미디어학회논문지
• /
• 제13권10호
• /
• pp.1565-1574
• /
• 2010

기존에 차량 내에서 음악은 사용자의 선택에 의하거나 또는 임의 추출 방식으로 제공되었다. 방식은 사용자로 하여금 운전시 선택에 따른 피로감을 유발케 하거나 또는 운전자의 기호와 관계없는 음악이 제공됨을 의미한다. 이를 개선하기 위하여 운전자의 기호를 반영하여 자동으로 음악을 제공하고자 하는 많은 시도가 이루어지고 있다. 그러나 이러한 연구의 주요한 난제들로는, 첫 째 사용자의 기호를 판단하기가 어렵다는 것이고, 둘 째 판단된 상태에 따라 어떤 음악을 연주토록 하는 것들이 있다. 본 논문에서는 위에서 제기된 난제들 가운데 두 번째 문제 해결을 위하여 Hevner의 형용사 검사표에 기초하여 서로 다른 음악 장르의 분위기를 대표할 수 있는 형용사를 도출하고 이를 국내음악의 각 장르와 연관 지음으로써 운전자 기호와 음악 장르 사이의 매핑 관계를 최초로 도출하고자 한다. 본 논문에서 도출된 매핑 관계에 대한 타당성이 모의 차량 음악 제공 실험을 통하여 검토된다. 그룹별로 임의 선정된 음악에 대한 사용자 만족도 평가와 첫 번째 실험 방식에 능동적인 피드백용 더한 경우의 사용자 만족도 평가 절과가 비교 분석된다.

• 한국CDE학회논문집
• /
• 제1권3호
• /
• pp.189-202
• /
• 1996

Complex geometric shapes can be defined simply and efficiently by combining and operating various surface primitives. These primitives and their intersection curves are used in finite element mesh generation to form an easy and intuitive procedure for finite element modelling of curved surfaces. This paper proposes techniques of automatic mesh generation on surface primitives with arbitrarily shaped boundaries and control curves, which may be created by surface to surface intersection. A method of automatic mesh generation on plane, which was previously developed by the author, has been modified for application to the surface mesh generation. Owing to the mesh generation-wise differences between planes and surfaces, the surfaces should be transformed into conceptual plane so that the modified plane mesh generation method can be applied. Surface development, mapping and mesh reconstruction are the key techniques suggested in this paper. The selection of the technique to apply can be determined automatically on the basis of the developability, existence of singularity and other characteristics of the surfaces on which the mesh is to be generated. The suggested techniques were implemented into parts of mesh generation functions of the finite element software, MacTran. Their validity and practicality were manifested by the actual use of this software.

• 대한원격탐사학회:학술대회논문집
• /
• 대한원격탐사학회 2007년도 Proceedings of ISRS 2007
• /
• pp.637-641
• /
• 2007

Airborne LIDAR (Light Detection and Ranging) technology has reached a degree of the required accuracy in mapping professions, and advanced LIDAR systems are becoming increasingly common in the various fields of application. LiDAR data constitute an excellent source of information for reconstructing the Earth's surface due to capability of rapid and dense 3D spatial data acquisition with high accuracy. However, organizing the LIDAR data and extracting information from the data are difficult tasks because LIDAR data are composed of randomly distributed point clouds and do not provide sufficient semantic information. The main reason for this difficulty in processing LIDAR data is that the data provide only irregularly spaced point coordinates without topological and relational information among the points. This study introduces an efficient and robust method for automatic extraction of building footprints using airborne LIDAR data. The proposed method separates ground and non-ground data based on the histogram analysis and then rearranges the building boundary points using convex hull algorithm to extract building footprints. The method was implemented to LIDAR data of the heavily built-up area. Experimental results showed the feasibility and efficiency of the proposed method for automatic producing building layers of the large scale digital maps and 3D building reconstruction.