• 대한방사선방어학회:학술대회논문집
• /
• 2009.04a
• /
• pp.276-277
• /
• 2009

• Proceedings of the Korean Radioactive Waste Society Conference
• /
• 2011.10a
• /
• pp.521-522
• /
• 2011

• Aerospace Engineering and Technology
• /
• v.6 no.2
• /
• pp.219-228
• /
• 2007

The test is performed to measure the accuracy of landmark matching process considering cloud detection performance and to analyze the evolution of this accuracy with respect to the cloud detection processing parameters. For the purpose, MTSAT-1R HiRiD data were used to induce final results. The test result shows that landmarks matching performance estimation on MTSAT-1R HiRiD data is considered as being between 0.06 and 0.09 IR pixel, corresponding to $7{\mu}rad$ and $10{\mu}rad$.

• Proceedings of the Korean Environmental Sciences Society Conference
• /
• 2018.10a
• /
• pp.129-129
• /
• 2018

• Journal of the Institute of Convergence Signal Processing
• /
• v.22 no.3
• /
• pp.91-98
• /
• 2021

The installation and performance test of the ISOL (Isotope Separation On Line) system for the generation and separation of Rare Isotopes (RI) beams is in progress at the Rare Isotope Science Project (RISP), Institute for Basic Science (IBS). The various RI beams generated by the ISOL target/ion source go through the beam lines and separators, and only the RI beam desired by the user is selected and transmitted to the superconducting linear accelerator at the downstream of the ISOL. In the ISOL system, two separators are installed to separate a specific RI beam, and control is performed by the Experimental Physics and Industrial Control System (EPICS). In this study, an EPICS IOC (Input-Output Control) was developed to measure the magnetic field of a dipole magnet for mass separation of a multivalent (n+) RI beam in the A/Q separator, which is one of the ISOL RI beam separators. The operational stability of the A/Q separator was tested through a magnetic field measurement using a Hall probe.

• Journal of Advanced Navigation Technology
• /
• v.19 no.1
• /
• pp.1-6
• /
• 2015

Due to the rapid increase in air traffic worldwide, ICAO has replaced the existing navigation equipment with equipment based on satellite navigation. As a part of that work, ICAO was planning to replace conventional takeoff and landing service using ILS with GBAS. Unlike ILS, GBAS which uses precision approach service inducing aircraft to airport and satellite based augmentation system providing precise position information service surrounding airport is capable of providing a required performance by only a system, regardless of the number of systems, and has an advantage that it is possible curved approach. In this paper, fuel reduction of ILS approach procedures and GBAS curved approach procedures is estimated and determined by flight test in Taean Airport.

• The Bulletin of The Korean Astronomical Society
• /
• v.37 no.2
• /
• pp.203.1-203.1
• /
• 2012

한국천문연구원에서는 2009년부터 외계행성 탐색시스템(KMTNet; Korea Microlensing Telescope Network) 개발 사업을 수행하고 있다. 이 사업에서는 중력렌즈 방법이나 별표면 통과(Transit) 방법으로 외계행성을 탐색하기 위하여, 1.6m 광학 망원경과 3.4억 화소의 모자이크 CCD 카메라로 구성된 2도x2도의 광시야 관측시스템을 제작하고 있다. 이 시스템은 2014년까지 남반구의 칠레 CTIO(1호기), 남아공화국 SAAO(2호기), 호주 SSO(3호기)에 설치될 예정이다. 우리은하 벌지 영역을 24시간 연속 모니터링 관측하여 외계행성과 변광천체를 탐색하는 것이 핵심연구주제이다. 광시야 망원경 1호기는 미국 Tucson에 건설된 관측시설 Prototype에 설치하여 공장시험을 수행하고 있다. 망원경의 지향(pointing) 정밀도와 Lucky Imaging 방법을 이용하여 얻은 광시야 광학계 성능 등 공장시험 결과를 보고할 것이다. 또한 핵심연구주제 이외의 관측시간을 활용할 2차 연구주제를 공모하여 심사한 결과를 제시할 것이다. 아울러 모자이크 CCD 카메라 제작, 남반구 관측소 설치 준비, 대용량 자료처리 시스템 개발, 남반구 관측소 운영 계획 등 전반적인 사업 현황과 계획을 발표할 것이다.

• The Bulletin of The Korean Astronomical Society
• /
• v.37 no.2
• /
• pp.155.1-155.1
• /
• 2012

한국천문연구원에서 개발 중인 외계행성 탐색시스템(Korea Microlensing Telescope Network, KMTNet)은 칠레, 남아프리카 공화국 및 호주에 3대의 동일한 사양을 갖는 1.6m 광시야 망원경과 $18K{\times}18K$ 모자이크 CCD 카메라를 설치하여 우리은하 중심방향에 대한 24시간 측광 모니터링을 통해 외계행성을 발견하는 것을 주된 연구목표로 가지고 있다. 특히 3개 관측소 중 가장 좋은 시상조건을 갖는 칠레 관측소의 경우에는 하룻밤에 최대 200GB의 관측 자료를 생산하고, 관측된 영상을 관측 다음날 네트워크를 통하여 모두 한국으로 가져온 후 일괄 자료처리과정을 거쳐 측광자료로 변환할 계획이다. 이에 우리는 효율적인 자료처리를 위해 관측영상을 특정 크기로 자르고 클러스터 시스템을 이용하여 분산 처리할 수 있는 파이프라인을 개발하였다. 이 발표에서는 우리가 구현한 KMTNet 자료처리 파이프라인의 전반적인 구성과 모의 관측 자료를 이용한 성능시험 결과 및 향후 영상자료의 증가에 따른 저장장치와 클러스터 시스템의 확장 계획에 대해 소개한다.

• Journal of the Korean Society of Radiology
• /
• v.17 no.7
• /
• pp.1189-1195
• /
• 2023

In scenarios involving inspections and verifications of nuclear facilities, ensuring the proper functioning of on-site safeguards equipment is crucial. There have been precedents in Kazakhstan where equipment failed to operate properly due to extremly cold temperatures, and the year-round minimum temperature at North Korea's Punggye-ri nuclear test site is approximately minus 30 degrees Celsius. To ensure the proper functioning of equipment in extreme environments for on-site verification of nuclear activities on the Korean Peninsula, relevant research is necessary. This includes confirming the functionality of equipment used in inspections and verifications, as well as analyzing factors that may disrupt their normal operation. This study aims to conduct a risk analysis for the normal operation of equipment in extreme environments and develop criteria and procedures for environmental-based performance testing. To achieve this, we conducted a risk analysis based on IAEA safeguards, analyzed the utilization of equipment, and performed a risk analysis associated with transportation for on-site verification considering the environmental characteristics of the Korean Peninsula. Furthermore, we provided performance testing criteria and procedures. The research results can be utilized as reference material in the verification and monitoring processes of nuclear activities.

• Applied Chemistry for Engineering
• /
• v.22 no.2
• /
• pp.196-202
• /
• 2011

In this paper, a series of alkyl succinic acid esters for base oil were synthesized by condensation reaction of succinic anhydride and fatty alcohol. The structures of the synthesized esters were confirmed by $^1H-NMR$, FT-IR spectrum and GC analysis. Basic properties of esters such as kinematic viscosity (KV), refractive index (RI), total acid number (TAN) and pour points were measured and lubricating properties such as SRV wear scar diameter (SRV WSD), fraction coefficient (COF) and 4-ball wear (4-ball WSD) were also evaluated. As the results of basic properties, KV, RI and pour point of synthetic esters increased as the carbon chain of the esters increased. Measurement value of total acid number (TAN) was indicated between 0.2~4 mgKOH/g, and that metal working fluids and pressure working oils are acceptable to use as base oil. Also, lubricating properties of the esters showed as follows: 0.391~0.689 mm of SRV WSD, 0.110~0.138 of SRV COF and 0.49~0.55 mm of 4-ball WSD depended on the structure of the esters. In a comparison on the lubrication capacity of the SRV test based on polyester TMPTO, SRV WSD result showed that a better performance caused by the alkyl group. On the other hand, SRV COF test was not influenced of the alkyl group which the capacity of the lubricant was sightly diminished than the comparison material, regardless of the alkyl group.