• Journal of Korea Multimedia Society
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• v.8 no.2
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• pp.225-232
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• 2005

A PDA has limitation of storage space and inconvenience of Pen-based equipment to input. To solve these problems, this paper implemented that previous Speech Recognition provides using XML(extensile Markup Language) Web Service and PDA Client is possible to use speech command by request Speech Recognition Web Service. This system consists of Mobile Client and Speech Recognition Web Service Provider. The Mobile Client transmits user information and speech data to the Speech Recognition Web Service Provider using DIME(Direct Internet Message Encapsulation). The Speech Recognition Web Service Provider returns recognition results and user name only to an authorized Mobile Client. So We are able to use speech service without installing Speech Recognition or Speech DB in PDA.

• Journal of Korean Society for Geospatial Information Science
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• v.17 no.2
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• pp.11-17
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• 2009

Terrestrial LiDAR can measure high capacity 3D-topography coordinates and try to apply to various public works such as tunnel surveying, facility deformation surveying. This experiment is about how to calculate ground cutting volume because the stage of the earth work spend lots of money and time among civil engineering works. Surveying cutting area using Terrestrial LiDAR and then calculating cutting area in planned area comparing sectional plan before construction and planned section and LiDAR data. Also, the values of the calculating ground cutting volume by three different resolution LiDAR has are compared and analyzed.

• Journal of the Korean Society of Hazard Mitigation
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• v.6 no.3 s.22
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• pp.17-28
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• 2006

Structural health monitoring is important to maintain the safety and serviceability of the structures. The displacement in the structure should be precisely and frequently monitored because it is a direct assessment index indicating its stiffness. However, no practical method has been developed to monitor such displacement precisely, particularly for high-rise buildings and long span bridges because they cannot be easily accessible. To overcome such difficult accessibility, we propose to use a LIDAR system that remotely samples the surface of an object using laser pulses and generates the coordinates of numerous points on the surface. In this study, using terrestrial LiDAR, we develop a novel displacement measuring model for structural health monitoring and perform an indoor experiment to prove its performance.

• Korean Journal of Remote Sensing
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• v.32 no.2
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• pp.119-131
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• 2016

Descriptions are provided of the automated aerosol-type classification and mass concentration calculation algorithm for real-time data processing and aerosol products in Korea Aerosol Lidar Observation Network (KALION, http://www.kalion.kr). The KALION algorithm provides aerosol-cloud classification and three aerosol types (clean continental, dust, and polluted continental/urban pollution aerosols). It also generates vertically resolved distributions of aerosol extinction coefficient and mass concentration. An extinction-to-backscatter ratio (lidar ratio) of 63.31 sr and aerosol mass extinction efficiency of $3.36m^2g^{-1}$ ($1.39m^2g^{-1}$ for dust), determined from co-located sky radiometer and $PM_{10}$ mass concentration measurements in Seoul from June 2006 to December 2015, are deployed in the algorithm. To assess the robustness of the algorithm, we investigate the pollution and dust events in Seoul on 28-30 March, 2015. The aerosol-type identification, especially for dust particles, is agreed with the official Asian dust report by Korean Meteorological Administration. The lidar-derived mass concentrations also well match with $PM_{10}$ mass concentrations. Mean bias difference between $PM_{10}$ and lidar-derived mass concentrations estimated from June 2006 to December 2015 in Seoul is about $3{\mu}g\;m^{-3}$. Lidar ratio and aerosol mass extinction efficiency for each aerosol types will be developed and implemented into the KALION algorithm. More products, such as ice and water-droplet cloud discrimination, cloud base height, and boundary layer height will be produced by the KALION algorithm.

• Korean Journal of Heritage: History & Science
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• v.56 no.4
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• pp.54-70
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• 2023

Surveys and studies on cultural assets using LiDAR measurement are already active overseas. Recently, awareness of the advantages and availability of LiDAR measurement has increased in Korea, and cases of using it for surveys of cultural assets are gradually increasing. However, it is usually restricted to surveys of mountain fortresses and is not actively used for surveys of ancient tombs yet. Therefore, this study intends to emphasize the need to secure fundamental data from LiDAR measurement for the era from the Three Kingdoms to Unified Silla in which recovery, maintenance, etc., in addition to the actual surveys, are unfulfilled due to the sites being mainly distributed in mountainous areas. For this, LiDAR measurement was executed for the area of Jangsan Ancient Tombs and Chunghyo-dong Ancient Tombs in Seoak-dong, Gyeongju, to review the distribution and geographical conditions of ancient tombs. As a result, in the Jangsan Ancient Tombs, in which a precision archaeological (measurement) survey was already executed, detailed geographic information and distribution conditions could be additionally identified, which could not be known only with the layout indicated by the topographic map of the existing report. Also, in the Chunghyo-dong Ancient Tombs, in which an additional survey was not conducted after 10 tombs were found during the Japanese colonial period, the location of the ancient tombs initially excavated was accurately identified, and the status and additional information was acquired, such as on the conditions of ancient tombs not surveyed. Such information may also be used as fundamental data for the preservation and maintenance of future ancient tombs in addition to the survey and study of the ancient tombs themselves. LiDAR measurement is most effective for identifying the condition of ancient tombs in mountainous areas where observation is difficult or access is limited due to the forest zone. It may be executed before on-site surveys, such as archaeological surveys, to secure data with high availability as prior surveys or pre-surveys. Therefore, it is necessary to secure fundamental data from LiDAR measurement in future surveys of ancient tombs and to establish a survey and maintenance/utilization plan based on this. To establish survey/study and preservation/maintenance measures for ancient tombs located in mountainous areas, a precision archaeological survey is currently executed to draw up a distribution chart of ancient tombs. If LiDAR measurement data is secured before this and used, a more effective and accurate distribution chart can be drawn up, and the actual conditions can be identified. Also, most omissions or errors in information can be prevented in on-site surveys of large regions. Therefore, it is necessary to accumulate fundamental data by actively using LiDAR measurement in future surveys of ancient tombs.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10a
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• pp.244-246
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• 2001

이동 컴퓨팅은 주로 서버에서 클라이언트로의 대역폭이 상대적으로 큰 비대칭적 환경에서 이루어진다. 비대칭적 판정에서 정보 전달은 브로드개스팅이 효과적이다. 기존의 많은 논문들이 서버가 전달하는 데이터의 크기가 같다고 가정하고 스케줄링 알고리즘을 제안하였지만 실제 데이터의 크기는 매우 다양하다 인기도가 비슷하더라도 데이터 크기가 다를 때 큰 데이터 대신 작은 데이터 여러 개를 전송하면 클라이언트의 평균 대기시간이 감소하여 성능이 향상될 수 있다. 따라서 본 논문에서는 대기시간을 최소화하기위해 인기도뿐만 아니라 데이터 크기도 함께 고려하는 스케줄링 기법을 제안하고 성능을 평가하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2022.01a
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• pp.301-302
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• 2022

최근 지상 통로에 차량 통행 공간과 보행자 통행 공간이 분리되어있지 않은 공원형 아파트가 증가하고 있다. 이로 인해 택배 차량의 아파트 단지 안으로 진입을 통제하는 아파트가 늘어나고 있다. 현재는 이러한 상황에서 택배기사들이 직접 손수레를 끌고 아파트 안으로 들어가거나, 수령인이 직접 아파트 입구에서 택배를 수령하는 방법으로 문제를 해결 해 왔다. 본 논문은 이러한 불편함을 개선하기 위해 아파트 입구에서 집 앞까지 인공지능 기술과 카메라, 라이다센서를 이용하여 자율주행으로 택배를 운반 해줄 수 있는 '자율주행 택배 운반 로봇' 기술을 제안한다. 기존의 사람이 직접 택배를 집 앞까지 운반하는 방식이 아닌 자율주행 로봇을 이용한 방식으로 택배기사들의 과로로 인한 사고를 예방하고, 아파트 입주민들의 불편도 줄어들 것이다.

• Korean Journal of Remote Sensing
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• v.30 no.5
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• pp.597-605
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• 2014

The continuous observations for atmospheric aerosols were conducted during 3 years (2009 to 2011) by using Gwangju Institute of Science and Technology (GIST) multi-wavelength Raman lidar at Gwangju, Korea ($35.10^{\circ}N$, $126.53^{\circ}E$). The aerosol depolarization ratios calculated from lidar data were used to identify the Asian dust layer. The optical properties of Asian dust layer were different according to its vertical distribution. In order to investigate the difference between the optical properties of each individual dust layers, the transport pathway and the transport altitude of Asian dust were analyzed by Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) model. We consider that the variation of optical properties were influenced not only their transport pathway but also their transport height when it passed over anthropogenic pollution source regions in China. The lower particle depolarization ratio values of $0.12{\pm}0.01$, higher lidar ratio of $67{\pm}9sr$ and $68{\pm}9sr$ at 355 nm and 532 nm, respectively, and higher ${\AA}ngstr\ddot{o}m$ exponent of $1.05{\pm}0.57$ which are considered as the optical properties of pollution were found. In contrast with this, the higher particle depolarization ratio values of $0.21{\pm}0.09$, lower lidar ratio of $48{\pm}5sr$ and $46{\pm}4sr$ at 355 nm and 532 nm, respectively, and lower ${\AA}ngstr\ddot{o}m$ exponent of $0.57{\pm}0.24$ which are considered as the optical properties of dust were found. We found that the degree of mixing of anthropogenic pollutant aerosols in mixed Asian dust govern the variation of optical properties of Asian dust and it depends on their altitude when it passed over the polluted regions over China.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10e
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• pp.418-420
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• 2002

다자간 그룹 통신에서는 일대일 통신과 다르게 그룹에 참여하는 참여자의 수가 많아지고, 각 참여자의 정보량이 많아짐에 따라 참여자들의 정보와 현재 상태 등을 체크하는 멤버쉽 관리 기능을 해 주는 구조가 필요하다. 본 논문에서는 이러한 다자간 통신에서 그룹에 참여하는 참여자들을 관리하는 그룹 관리 프로토콜의 한 부분인 멤버쉽 관리(Membership Management) 기능을 설계 구현하였다. 이러한 MM 기능은 클라이언트／서버 기반으로 동작하며, 서버측에서 모든 클라이언트의 멤버쉽을 관리한다. 설계된 멤버쉽 관리 기능의 알고리즘은 간단하기 때문에 그룹 통신에서 간단하고 효율적인 멤버쉽 관리를 할 수 있으며, 멤버쉽 관리를 서버측에서 함으로서 송신자측의 부담이 줄어든다. 본 논문에서는 멤버쉽 관리를 시험하기 위한 응용으로서 멀티캐스트 전송 프로토콜인 ECTP 배포판에 나온 응용을 사용하여 시험하였다.

• Proceedings of the Korea Database Society Conference
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• 1995.12a
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• pp.127-131
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• 1995

응용프로그램과 통신처리 프로그램간의 접속에 있어서는 응용 프로그래머가 통신을 고려하지 않고 개발해야 하며 중앙집중식 다자간 통신을 분산식 다자간 통신으로 지원할 수 있는 통신 모듈이 이상적이다. 중앙집중식 통신을 사용시에는 반드시 서버의 역할을 하는 중계시스템을 거쳐야 하지만 분산식 통신을 한다면 중계자론 거치지 않고 통신게임을 원하는 사용자간의 의사에 의해서 게임을 할 수 있다. 본 논문에서는 클라이언트와 서버의 기능을 통합한 단일모듈을 이용해서 분산통신 모듈이 가져야할 편의성, 범용성, 이벤트 동기화, 다중성등에 관하여 논의한다. 그리고 전락 시뮬레이션의 형태에 따른 세가지 유형의 예를 설정한다. 첫째는 웨이브 파일서버의 형태를 갖으면서 정해져 있는 시나리오를 따르는 게임이다. 둘째는 바둑과 같은 형태의 토큰을 통해서 제어권을 행사하는 것이다. 셋째는 토큰을 갖지 않고도 제어권을 행사하는 것이다. 마지막으로 본 논문에서 제안하는 통신모듈을 이용하여서 개발 중에 있는 Death Flower라는 게임을 소개한다.