• 한국조경학회지
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• 제27권4호
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• pp.137-142
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• 1999

The purpose of this study is to develope a CAD-based tool for rasterization of polygonal vector map in AutoCAD. To identity the layer property of polygonal entity with user-defined coordinates as topology, algorithm in processing entity data of selection set that intersected with scan line was used, and the layers were extracted sequentially by sorted intersecting points in data-list. In addition to the functions for querying and modifying topology, two options for mapping were set up to construct plan projection type and to change meshes' properties in existing DTM data. In case of plan projection type, user-defined cell size of 3DFACE mesh is available for more detailed edge, and topological draping on landform can be executed in case of referring DTM data as an AutoCAD's drawing. The concept of algorithm was simple and clear, but some unexpectable errors were found in detecting intersected coordinates that were AutoCAD's error, not the utility's. Also, the routines to check these errors were included in algorithmic processing. Developed utility named MESHMAP was written in entity data control functions of AutoLISP language and dialog control language(DCL) for the purpose of user-oriented interactive usage. MESHMAP was proved to be more effective in data handling and time comparing with GRIDMAP module in LANDCADD which has similar function.

• 한국측량학회지
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• 제18권3호
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• pp.241-250
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• 2000

$\boxDr$국가지리정보체계(NGIS) 구축 기본계획$\boxUl$의 공통주제도 수치지도화 사업의 세부 추진계획에 따라 2000년까지 공통주제도 중에서 활용빈도가 높은 주제도 6종을 먼저 제작할 예정이다. 본 연구에서는 사용자 설문조사 및 선행사례 분석을 통하여 지형ㆍ지번도의 활용범위 및 세부제작공정을 도출하고 수원시 일대를 대상으로 지형ㆍ지번도를 시범 제작하였다. 시범 제작된 지형ㆍ지번도의 제작과정 분석 및 검수, 사용자의 요구사항 등을 반영하여 세부제작공정을 수정ㆍ보완하여 지형ㆍ지번도 제작방안(안)을 제시하였다. 또한, 데이터 구축 및 유지ㆍ관리방안과 소요예산 산정에 필요한 비용모델, 수치지형도 보완사항 등도 제시하여 지형ㆍ지번도 전산화사업이 효율적으로 추진될 수 있도록 하였다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 추계 학술발표회 2차
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• pp.200-211
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• 2010

Tunnel Mapper, which is tunnel face survey system was used to conduct Face Mapping on the face of the tunnel that is under construction. Then, accuracy and utility value on the forecast of discontinuity were verified to verify the field application in order to present the measures for the use of the system for conducting research on the discontinuity. As result of the directivity verification following discontinuity‘s project, forecasted measurement and actually researched measurement error for the Dip direction and Dip angle was less than ${\pm}10$. Accuracy was 82.6% for Dip direction and 90.7% for Dip angle, which are high. Accordingly, face research discontinuity forecasting system's reliability level towards directivity is high. Tunnel Mapper, a tunnel face survey system can be leveraged to replace face's visual survey and to obtain objective information, enabling execution of the survey system that can automate face survey going beyond time and space related limitations.

• 한국통신학회논문지
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• 제35권4A호
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• pp.386-393
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• 2010

본 논문에서는 3GPP LTE 하향링크 표준에 기반한 BICM 시스템에서 기존의 심볼 맵핑 다이버시티를 이용한 HARQ 기술들(e.g., MDSM, CORE)을 비교 분석한다. 다중경로 페이딩 채널과 오류정정부호가 적용된 보다 실제 적인 무선통신 환경을 고려함으로써 기존 기법들의 실제 시스템으로의 구현 적합성을 판단하고, 구현 복잡도 및 저장 공간을 줄이면서 이들에 준하는 프레임 오율 성능을 나타내는 간단한 기법을 제안한다. 그리고 다수의 송 수신 안테나를 이용하는 MIMO-OFDM 시스템에 다양한 심볼 맵핑 다이버시티 기법들을 적용하고, 이들의 오율 성능을 분석한다.

• 한국측량학회지
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• 제38권5호
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• pp.425-433
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• 2020

Three-dimensional data has been used for different applications such as robotics, building reconstruction, and so on. 3D data can be generated from an optical camera or a laser scanner. Especially, a wearable multi-sensor system including the above-mentioned sensors is an optimized structure that can overcome the drawbacks of each sensor. After finding the geometric relationships between sensors, georeferencing of the datasets acquired from the moving system, should be carried out. Especially, in an indoor environment, error propagation always causes problem in the georeferencing process. To improve the accuracy of this process, other sources of data were used to combine with LiDAR (Light Detection and Ranging) data, and various registration methods were also tested to find the most suitable way. More specifically, this paper proposed a new process of NDT (Normal Distribution Transform) to register the LiDAR point cloud, with additional information from other sensors. For real experiment, a wearable mapping system was used to acquire datasets in an indoor environment. The results showed that applying the new process of NDT and combining LiDAR data with IMU (Inertial Measurement Unit) information achieved the best result with the RMSE 0.063 m.

• 한국측량학회지
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• 제17권3호
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• pp.283-292
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• 1999

본 논문에서는 대축척 항공 사진(1/5,000)을 촬영할 때 수신한 GPS 자료를 처리하여 결정한 항공 사진 카메라의 투영중심 위치를 이용한 항공삼각측량에 대해서 연구하였다. 항공삼각측량에 적용 가능성을 검토하기 위해 GPS자료를 처리하여 모델 조정법으로 결정한 투영중심의 위치와 비교하여 정확도 및 오차를 분석하였다. 또한, GPS 자료로 결정한 투영중심의 위치를 광속 조정법에 적용하였다. 기준국으로부터 30 km이내인 경우 L1 반송파 자료를 이용하여 결정한 투영중심 위치의 정확도는 일정하고, 4개의 기준점으로 평면(XY) 정확도(RMS)는 13 cm, 높이(Z) 정확도(RMS)는 15 cm로 수치지도 제작에 필요한 정확도를 얻을 수 있었다. 따라서, GPS를 항공삼각측량에 이용함으로써 경제적인 지도 제작 방안을 제시하였다.

• 대한음성학회지:말소리
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• 제52호
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• pp.161-169
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• 2004

This paper describes the automated call routing for train ticket reservation aid system based on speech recognition. We focus on the task of automatically routing telephone calls based on user's fluently spoken response instead of touch tone menus in an interactive voice response system. Vector-based call routing algorithm is investigated and mapping table for key term is suggested. Korail database collected by KT is used for call routing experiment. We evaluate call-classification experiments for transcribed text from Korail database. In case of small training data, an average call routing error reduction rate of 14% is observed when mapping table is used.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2005년도 가을 학술발표논문집 Vol.32 No.2 (1)
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• pp.280-282
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• 2005

In this paper we propose several mapping schemes for streaming video generated by state-of-the-art H.264 codec over IEEE 802.11e enabled wireless LANs. The schemes take advantage of both 802.11e's QoS mechanism and some novel features of the H.264 codec, so as to protect the most important information in terms of visual quality and reduce distortion under network congestion. The proposed methods are evaluated by means of the H.264 reference software codec, network simulation, and objective video quality measurements. Results show that the proposed methods achieve a robust and error resilient H.264 video streaming over wireless LANs than traditional best-effort streaming.

• Korea-Australia Rheology Journal
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• 제15권4호
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• pp.197-208
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• 2003

Two measures of distributive mixing are examined: the standard deviation $\sigma$ and the maximum error E, among average concentrations of finite-sized samples. Curves of E versus sample size L are easily interpreted in terms of the size and intensity of the worst flaw in the mixture. E(L) is sensitive to the size of this flaw, regardless of the overall size of the mixture. The measures are used to study distributive mixing for time-periodic flows in a rectangular cavity, using the mapping method. Globally chaotic flows display a well-defined asymptotic behavior: E and $\sigma$ decrease exponentially with time, and the curves of E(L) and $\sigma$ (L) achieve a self-similar shape. This behavior is independent of the initial configuration of the fluids. Flows with large islands do not show self-similarity, and the final mixing result is strongly dependent on the initial fluid configuration.

• 한국생산제조학회지
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• 제8권5호
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• pp.70-75
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• 1999

Adaptive control in the robotic GMA(Gas Metal Arc) welding is employed to monitor the information about weld characteristics and process paramters as well as modification of those parameters to hold weld quality within the acceptable limits. Typical characteristics are the bead geometry composition micrrostructure appearance and process parameters which govern the quality of the final weld. The main objectives of this paper are to realize the mapping characteristicso f penetration through the learning. After learning the neural network can predict the pene-traition desired from the learning mapping characteristic. The design parameters of the neural network estimator(the number of hidden layers and the number of nodes in a layer) were chosen from an error analysis. partial-penetration single-pass bead-on-plate welds were fabricated in 12mm mild steel plates in order to verify the performance of the neural network estimator. The experimental results show that the proposed neural network estimator can predict the penetration with reasonable accuracy and gurarantee the uniform weld quality.