• Journal of IKEEE
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• v.21 no.4
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• pp.408-411
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• 2017

In this paper, we propose an integrated control system that measures neutrons, gamma ray, and x-ray. The proposed system is able to monitor and control the data measured and analyzed on the remote or network, and can monitor and control the status of each part of the system remotely without remote control. The proposed system consists of a gamma ray/x-ray sensor part, a neutron sensor part, a main control embedded system part, a dedicated display device and GUI part, and a remote UI part. The gamma ray/x-ray sensor part measures gamma ray and x-ray of low level by using NaI(Tl) scintillation detector. The neutron sensor part measures neutrons using Proportional Counter Detector(low-level neutron) and Ion Chamber Type Detector(high-level neutron). The main control embedded system part detects radiation, samples it in seconds, and converts it into radiation dose for accumulated pulse and current values. The dedicated display device and the GUI part output the radiation measurement result and the converted radiation amount and radiation amount measurement value and provide the user with the control condition setting and the calibration function for the detection part. The remote UI unit collects and stores the measured values and transmits them to the remote monitoring system. In order to evaluate the performance of the proposed system, the measurement uncertainty of the neutron detector was measured to less than ${\pm}8.2%$ and the gamma ray and x-ray detector had the uncertainty of less than 7.5%. It was confirmed that the normal operation was not less than ${\pm}15$ percent of the international standard.

• Journal of the Korean Society of Marine Environment & Safety
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• v.29 no.4
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• pp.389-394
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• 2023

In recent years, use of machine automation is rising in the industry. Ships also obtain machine condition information from sensor as digital information. However, on ships, crew members regularly surveil the engine room to check the condition of equipment and their information through analog gauges. This is a time-consuming and tedious process and poses safety risks to the crew while on surveillance. To address this, engine room surveillance using an autonomous mobile robot is being actively explored as a solution because it can reduce time, costs, and the safety risks for crew. Analog gauge reading using an autonomous mobile robot requires digitization for the robot to recognize the gauge value. In this study, image processing techniques were applied to achieve this. Analog gauge images were subjected to image preprocessing to remove noise and highlight their features. The center point, indicator point, minimum value and maximum value of the analog gauge were detected through image processing. Through the straight line connecting these points, the angle from the minimum value to the maximum value and the angle from the minimum value to indicator point were obtained. The obtained angle is digitized as the value currently indicated by the analog gauge through a formula. It was confirmed from the experiments that the digitization of the analog gauge using image processing was successful, indicating the equivalent current value shown by the gauge. When applied to surveillance robots, this algorithm can minimize safety risks and time and opportunity costs of crew members for engine room surveillance.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39C no.8
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• pp.660-666
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• 2014

In this paper, we consider a classification criteria of sensor nodes based on equipment function, and propose a routing search algorithm between node when an IP-USN is applied inside a ship. whereas a tree-type routing algorithm is applied to the limited mobile enviroment, such as engine room or machine room, a mesh-type routing alogrithm is to free mobile enviroment, such as passager corridor liviing quarters or restanrats areas. For mesh-type routing, it is necessary to maintain a seamless route path between a sink node and sensor nodes for which we consider a novel message exchange periodically. We proposed a new message, RDES message, which is issued periodically to update the topology of sensor node and check a connectivity between nodes.

• Proceedings of the KSRS Conference
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• 2009.03a
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• pp.167-171
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• 2009

정지궤도에서는 세계 최초의 해양관측위성으로 개발된 정지궤도 해양위성(GOCI, Geostationary Ocean Color Imager)은 통신해양기상위성(COMS, Communication, Ocean and Meterological Satellite)의 탑재체로서 2009년말 발사 예정이다. 정지궤도 해양위성의 복사보정은 센서의 전기적 특성에 의한 잡음을 제거하기 위한 암흑전류 교정(Dark Current Correction)을 먼저 수행한 다음, 주운영지상국인 해양위성센터(KOSC, Korea Ocean Satellite Center)에서 수신된 위성의 원시자료의 Digital Number(DN)를 실제 해양원격탐사에서 이용하는 물리량인 복사휘도(Radiance, $W/m^2/{\mu}m/sr$)로 변환하는 복사보정을 수행한다. 정확도 높은 복사보정을 수행하기 위해서는 기준광원의 복사휘도와 센서의 물리적 특성을 정확하게 알아야 한다. 정지궤도 해양위성 궤도상 복사보정(on-orbit radiometric calibration)에서는 태양이 기준광원이기 때문에, 기준 태양복사모델(Thuillier 2004 Solar Irradiance Model)에서 지구-태양간 거리 변화(1년 주기)를 보정한 태양의 방사도 (Irradiance)를 이용하고, 태양입사각에 대한 태양광 확산기의 감쇄 특성 변화를 고려하여 센서에 입력되는 복사휘도를 계산한다. 센서의 물리적 특성으로 인한 복사보정의 오차를 줄이기 위해 우주방사선 및 우주먼지(space debris)로 인해 위성 운용기간 중 그 특성이 저하되는 태양광 확산기(solar Diffuser)의 특성변화를 모니터링하기 위한 DAMD(Diffuser Aging Monitoring Device)를 이용한다. 정지궤도 해양위성 주관운영기관인 한국해양연구원의 해양위성센터에서는 정지궤도 해양위성 복사보정을 수행하기 위한 S/W를 통신해양기상위성 자료처리시스템 개발사업의 일환으로 개발하였으며, 관련 성능 시험을 수행하고 있다.

• Journal of the Korean Society of Propulsion Engineers
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• v.13 no.4
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• pp.55-62
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• 2009

Fracture behavior of ceramic dome port cover on air breathing engine using liquid and solid fuel propulsion system was carried out in this study. Fracture characteristics was tested and estimated using scaled model of ceramic dome port cover by Shock tube. Fracture behavior was obtained by the fracture pressure from pressure sensor and observed the scattering phenomena of fracture specimen using high speed camera. Results obtained from this study can be used in the base data of dome port cover design for an air breathing engine.

• Journal of Sensor Science and Technology
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• v.7 no.3
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• pp.211-217
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• 1998

Si and ITO-coated #7059 glass wafers were electrostatically bonded by employing #7740 interlayer. It was inferred that the thermionic- electrostatic migration of $Na^{+}$ ions in the #7740 interlayer played an important role in the bonding process through SIMS analysis. The temperature and voltage required for reliable electrostatic bonding were in the range of $180{\sim}200^{\circ}C$ and $50{\sim}70V_{dc}$(10min), respectively. The low temperature Si-ITO coated glass bonding can be effectively applied to the packaging of field emission devices.

• Proceedings of the KIPE Conference
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• 2013.07a
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• pp.61-62
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• 2013

최근 EV(Electric Vehicle), PHEV(Plug-in Hybrid Electric Vehicle), HEV(Hybrid Electric Vehicle) 등 친환경 차량의 개발 및 출시가 진행되고 있고 이들 친환경 차량의 궁극적 목적은 엔진과 배터리 혹은 배터리 단독 사용에 의한 고연비, 배기가스 배출 저감 등을 목적으로 하고 있다. 하지만 기존 내연기관 차량과 비교시 차량가격이 높게 형성되어 시장 활성화는 다소 시간이 소요될 것으로 판단된다. 이러한 친환경 차량 기술은 신차에만 국한되어 적용되고 있고 현재 도로상에서 운행중인 대부분의 차량은 기존의 저연비, 다량의 배기가스 배출문제를 여전히 내포하고 있는 실정이다. 이에 대한 대안으로 기존의 차량 보조배터리에 지능형 배터리 센서(IBS, Intelligent Battery Sensor)를 장착하고 이를 통해 ISG(Idle Stop&Go)을 수행하는 Mild HEV 형태의 차량이 개발되고 있다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2013.06a
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• pp.372-374
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• 2013

스마트 단말에 장착된 센서들로부터 단말의 상황 정보를 수집하고 분석하여, 상황에 적절한 동영상을 단말에게 스트리밍해 주는 서비스 구조를 제안한다. 스마트 단말은 NFC 또는 QR 코드 기반으로 전시물이나 특정 사물에 기등록된 동영상 정보를 획득하고, 저밀도 기반 WiFi 무선 실내 측위 기술을 사용하여 단말이 위치한 실내 공간 정보를 서버에 제공한다. 상황인지형 스트리밍 서버는 단말이 요청한 정보를 토대로 단말의 해상도에 적절한 동영상을 스트리밍 한다. 설계된 상황인지형 비디오 스트리밍 서비스 구조는 전시와 컨벤션, 대형 기관 및 테마파크의 안내 및 홍보 등의 용도로 활용될 수 있다.

• Annual Conference of KIPS
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• 2015.04a
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• pp.199-202
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• 2015

본 논문은 재난 방재 시 실내의 지하시설, 음영지역의 재난 상황 정보에 대하여 원활한 서비스 제공에 대해 제안 하였다. 소셜 네트워크 서비스를 통해 사용자가 공유하는 자연재해 발생 정보를 자동적으로 감지하고, 수집된 정보를 분석하여 FOAF 기반으로 소셜 네트워크와의 관계 및 특성을 이끌어내어 연계가 용이하도록 온톨로지 추론을 설계하였다. 또한 사용자의 분석된 정보에 따라 기관 및 개인에게 정보를 신속하게 제공할 수 있는 시스템의 설계를 제시하여, 재난 방재 시 BLE 센서를 이용한 재난재해 정보를 재난환경 주변의 사람들에게 실시간으로 알려주는 시스템을 제시하였다.

• Journal of IKEEE
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• v.27 no.1
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• pp.122-126
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• 2023

In this paper, a control system for a complex microbial incubator was proposed. The proposed control system consists of a control unit, a communication unit, a power supply unit, and a control system of the complex microbial incubator. The controller of the complex microbial incubator is designed and manufactured to convert analog signals and digital signals, and control signals of sensors such as displays using LCD panels, water level sensors, temperature sensors, and pH concentration sensors. The water level sensor used is designed and manufactured to enable accurate water level measurement by using the IR laser method with excellent linearity in order to solve the problem that existing water level sensors are difficult to measure due to foreign substances such as bubbles. The temperature sensor is designed and used so that it has high accuracy and no cumulative resistance error by measuring using the thermal resistance principle. The communication unit consists of two LAN ports and one RS-232 port, and is designed and manufactured to transmit signals such as LCD panel, PCT panel, and load cell controller used in the complex microbial incubator to the control unit. The power supply unit is designed and manufactured to supply power by configuring it with three voltage supply terminals such as 24V, 12V and 5V so that the control unit and communication unit can operate smoothly. The control system of the complex microbial incubator uses PLC to control sensor values such as pH concentration sensor, temperature sensor, and water level sensor, and the operation of circulation pump, circulation valve, rotary pump, and inverter load cell used for cultivation. In order to evaluate the performance of the control system of the proposed complex microbial incubator, the result of the experiment conducted by the accredited certification body showed that the range of water level measurement sensitivity was -0.41mm~1.59mm, and the range of change in water temperature was ±0.41℃, which is currently commercially available. It was confirmed that the product operates with better performance than the performance of the products. Therefore, the effectiveness of the control system of the complex microbial incubator proposed in this paper was demonstrated.