• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.39 no.5
• /
• pp.517-526
• /
• 2015

This paper presents the results of study for improving the reliability of quadrotor attitude control by applying a multi-sensor along with a data fusion algorithm. First, a mathematical model of the quadrotor dynamics was developed. Then, using the quadrotor mathematical model, simulations were performed using the improved reliability multi-sensor data as the inputs. From the simulation results, we designed a Gimbal-equipped quadrotor system. With the quadrotor in a hover state, we performed experiments according to the angle change of the user's specifications. We then calculated the attitude control data from the actual experimental data. Furthermore, with additional simulations, we verified the performance of the designed quadrotor attitude control system with multiple sensors.

• Journal of the Korea Society of Computer and Information
• /
• v.19 no.9
• /
• pp.75-84
• /
• 2014

In this paper, we constructed a sensor network environment where various sensors are used. Then, we evaluated the performance when this environment adopted existing clustering algorithms that are designed for only single type sensors network. In our experiments, we considered two different types of the networks. In the first, all nodes are equipped with identical sensors. In the second, all nodes are equipped with three different types of sensors. We measured performance variations of several clustering schemes in accordance with sensor data accuracy, sensor node resource depletion timing, amount of available energy, node isolation ratio, and network lifetime. According to our performance analysis, we proved that existing clustering algorithms are partially inefficient to maintain the various-sensor network. Consequently we suggest that a new algorithm is required to take aim at the various sensor network.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2017.11a
• /
• pp.1307-1310
• /
• 2017

이 논문에서는 다종 재배 환경을 고려한 이동형 스마트팜 모니터링 로봇을 제안한다. 기존 스마트 농장 연구는 각 구역마다 고정형 측정 장치를 이용하여 데이터를 수집한다. 또한 고정형 센서 기반 스마트 농장이므로 다종, 다수의 센서가 필요하다는 문제점이 있다. 이 논문에서 제안하는 것은 기존의 스마트 농장과는 달리 스마트팜 모니터링 로봇은 농장의 모든 구역을 이동을 하며 데이터를 측정, 수집한다. 그리고 수집한 데이터를 웹 페이지를 통해 시각화한다. 그 결과 제안한 시스템을 통해 자동으로 이동 및 측정을 하여 다종의 재배 환경에서도 안정적으로 정확한 측정이 가능하다는 장점이 있다.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.17 no.3
• /
• pp.197-202
• /
• 2011

This study introduces a technique to merge three different sea surface temperature(SST) data obtained from multi-satellite sensors. NGSST algorithm, the most popular method of related society, estimates a center pixel of target SST using temporal and spatial correlations, excluding SST accuracies according to sensing methods or properties of satellites. We suggest a merging method of SST to consider the accuracy by satellite or sensor with a comparison with NGSST method. The data used for a merged daily SST with spatial resolution of 5 km was applied from three different satellite sensors such as MODIS, AVHRR and AMSR-E from April 2 to 4, 2011 around the southern coast of Korea. Results of the comparisons showed that the new method is higher than the NGSST method and its STDEV represents a comparatively low value. In future we are planning to compare and analyze the datasets during the daytime as well as nighttime over total cycle of the day.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2017.11a
• /
• pp.159-162
• /
• 2017

본 논문에서는 쿼드로터의 자동 호버링을 구현하기위해 다종 센서를 융합하여 자세 및 고도제어, 위치홀딩 시스템 기술을 직접 제작한 기체에 적용해 방법을 제시한다. 개발된 기술은 민간, 산업, 국방 등 다양한 분야의 드론에 적용시켜, 높은 안정성과 신뢰성을 확보한 비행 능력을 제공하는데 초점을 맞추고 있다.

• Journal of the Korea Society for Simulation
• /
• v.17 no.4
• /
• pp.153-158
• /
• 2008

The technology of Software Defined Radio (SDR) is a possible solution to interwork flexibly between various wireless transport protocols. Ubiquitous network, like u-health service network, includes sensor devices or nodes which do not facilitate all the same transport protocols to access network. As such this may be in such unreachable situations as poverty of all required AP (Access Point)’s, faults or contention in a path of particular protocol communication, etc. This paper presents research results of modeling and simulation to analyze transport performance of multi-protocol ubiquitous network which includes SDR-based interwork nodes and congestion-controlled AP’s. Focusing mainly on dynamics of overall transport performance rather than protocol execution procedures, this paper employs the Zeigler’s DEVS (Discrete Event Systems Specification) methodology and DEVSim++simulation environment to experiment.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2015.07a
• /
• pp.277-278
• /
• 2015

본 연구는 기존에 제안되었던 혼잡 제어 기법, 그리고 여기에서 고려하지 못한 다종 센서 네트워크 환경을 고려한 혼잡 제어 기법에 대한 연구를 포함한다. 기존의 방법은 대규모 센서 네트워크 또는 특정한 타입의 데이터를 가정하고 혼잡 제어 기법을 제안하였다. 그러나 최근의 센서 네트워크 응용은 다양한 센서의 개발로 그 범위가 확장되는 추세에 있어 다수의 이종 센서 노드가 네트워크 구성 인자로 참여하는 환경이므로 이에 대한 연구가 필요하다. 이에 우리는 기존의 혼잡 제어 메커니즘은 분석하고 이종 센서가 참여하는 센서 네트워크를 고려하는 혼잡 제어 기법을 연구한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2017.10a
• /
• pp.705-707
• /
• 2017

Stereo-based spatial radiation detection devices can obtain not only spatial distribution information about the radiation source but also distance information from the detection device to the source. And it provides more efficient information on the source than the existing radiation imaging device. In order to provide high-speed information on the spectrum and type of gamma-ray source, a high-sensitivity detection sensor with high sensitivity is required, and a technique capable of solving the saturation phenomenon at a high dose is needed. In this paper, we constructed a high sensitivity sensor for the measurement of multiple gamma - ray spatial distributions using improved function of detection module to solve saturation to high dose and conducted research to increase the scope of a single detector. The result of this paper improves the performance of gamma ray.

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2001.11a
• /
• pp.301-302
• /
• 2001

본 연구에서는 공단에서 발생하는 악취물질을 냄새센서를 이용하여 상시 감시하는 것을 목적으로 한다. 현재 다종다양한 냄새를 측정하기 위한 악취평가 방법으로는 관능측정법이 이용되고 있다. 그러나 이 방법은 악취판정원의 냄새세기의 차이와 판정원(panel)의 생체리듬에 따른 차이로 인하여 냄새의 객관적인 평가에 무리가 따르며, 언제, 어디서 돌발적으로 발생하는 악취의 연속적인 감시에 문제점을 나타내고 있다. 더욱이 우리나라는 환경 악취에 대해 직접관능측정법에 의한 악취 측정이 실시 되고 있어서 객관적으로 악취평가를 하기가 매우 곤란하다. (중략)

• Journal of the Society of Disaster Information
• /
• v.20 no.2
• /
• pp.315-328
• /
• 2024

Purpose: The purpose of this paper is to present a service construction plan using multiple complex sensor information to detect abnormal situations in urban life safety that are difficult to identify on CCTV. Method: This study selected service scenarios based on actual testbed data and analyzed service importance for local government control center operators, which are main users. Result: Service scenarios were selected as detection of day and night dynamic object, Detection of sudden temperature changes, and Detection of time-series temperature changes. As a result of AHP analysis, walking and mobility collision risk situation services and fire foreshadowing detection services leading to immediate major disasters were highly evaluated. Conclusion: This study is significant in proposing a plan to build an anomaly detection service that can be used in local governments based on real data. This study is significant in proposing a plan to build an anomaly detection service that can be used by local governments based on testbed data.