• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume II
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• pp.804-807
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• 2006

The SRI(Super Resolution Imager) with 800mm aperture primary mirror is the ground development model of the high resolution satellite camera. The SRI focal plane electronics including detector array generates the data for high-resolution images by converting incoming light into digital stream of pixel data. Since the focal plane including a detector is the basic building block of the camera system, the main system performances is directly determined by its performance. This paper measures the SRI focal plane electronics’ performance such as the dark signal, the dark signal noise, the linearity, the PRNU(Photo Response Non-Uniformity), the SNR(Signal to Noise Ratio) and the sensor saturation capability. In addition, this paper verifies the various functionalities of the SRI focal plane electronics. The electrical test equipment with the specialized software and the optical test equipments such as the integrating sphere, the rotation stage and the target are implemented and used to verify these functionalities and performances.

• Earthquakes and Structures
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• 제3권6호
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• pp.839-852
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• 2012

Earthquake records are often analyzed in various earthquake engineering problems, making time-frequency analysis for such records of primary concern. The best tool for such analysis appears to be based on wavelet functions; selection of which is not an easy task and is commonly carried through trial and error process. Furthermore, often a particular wavelet is adopted for analysis of various earthquakes irrespective of record's prime characteristics, e.g. wave's magnitude. A wavelet constructed based on records' characteristics may yield a more accurate solution and more efficient solution procedure in time-frequency analysis. In this study, a low-pass reconstruction filter is obtained for each earthquake record based on multi-resolution decomposition technique; the filter is then assigned to be the normalized version of the last approximation component with respect to its magnitude. The scaling and wavelet functions are computed using two-scale relations. The calculated wavelets are highly efficient in decomposing the original records as compared to other commonly used wavelets such as Daubechies2 wavelet. The method is further advantageous since it enables one to decompose the original record in such a way that a clear time-frequency resolution is obtained.

• 항공우주기술
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• 제10권2호
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• pp.101-104
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• 2011

고해상도 전자광학 탑재체의 주 반사경과 제2 반사경 간 조립 정렬은 전체 카메라 시스템의 조립 단계 중 가장 중요한 단계이다. 제 2 반사경의 정렬에는 파면센서와 콜리메이터를 사용하였는데 간섭계 보다는 크기가 작고 다루기가 편하기 때문이다. 본 논문에서는 고해상도 전자광학 탑재체의 제 2 반사경에 대한 정렬 방법과 절차에 대해 소개 하고자 한다.

• 한국통신학회논문지
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• 제31권2B호
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• pp.107-116
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• 2006

본 논문에서는 무선 센서 네트워크에서 센싱 정밀도에 기반 한 그룹화 통신 프로토콜 (SRG)을 제안한다. SRG 는 센서 노드가 밀집해 있는 네트워크에서 응용계층이 요구하는 센싱 정밀도를 만족시키는 방법을 제공하는데, 그룹 헤더 노드를 매 round 마다 라운드-로빈 방식으로 교체하여 전반적인 센싱 정밀도를 높이고 각 노드가 소모하는 에너지를 비슷하게 되도록 만든다. 또한 라우팅 시에 소모되는 에너지를 줄이기 위해 그룹의 크기와 에너지 소모를 고려한 중계 노드를 선택 방법 제안하여 에너지 효율적인 통신이 이뤄지도록 한다. 성능평가를 위한 모의실험 결과 제안한 SRG 프로토콜은 센서노드들의 에너지 소비량을 줄이고 네트워크의 생존시간을 늘리는 것을 알 수 있다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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• pp.249-252
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• 2005

Microphytobenthos bloom from late January to early March in Korean tidal flats. KOMPSAT-2 will provide multi-spectral images with a spatial resolution of 4 m comparable with IKONOS. Using IKONOS and Landsat data, algal mat detection was tested in the Saemangeum area~ Micro-benthic diatoms are abundant and a major primary product in the tidal flats. A linear spectral unmixing (LSU) method was applied to the test data. LSU was effective to detect algal mat and the classified algal mat fraction well correlated with NDVI image. Fine grained upper tidal flats are generally known to be the best environment for algal mat. Algal mat thriving in coarse grained lower tidal flats as well as upper tidal flats were reported in this study. A high resolution multi-spectral sensor in KOMPSAT-2 will provide useful data for long-term monitoring of microphytobenthos in tidal flats.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제21권4호
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• pp.347-350
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• 2018

Drug-induced autoimmune hepatitis (DIAIH) is an increasingly recognized form of drug-induced liver injury that leads to a condition similar to idiopathic autoimmune hepatitis. A number of drugs have been associated with DIAIH, minocycline is one of the most well characterized. Minocycline is a semisynthetic tetracycline antibiotic used in the treatment of acne vulgaris. Minocycline-induced autoimmune hepatitis presents with serologic and histologic features similar to idiopathic autoimmune hepatitis. However, the natural history and outcomes of these two conditions differ significantly. The majority of patients with minocycline-induced autoimmune hepatitis experience complete resolution of symptoms after withdrawal of the medication. Some patients may require a short course of steroids and rarely use of an immunomodulator to achieve resolution of disease. Recurrence of symptoms is rare and typically only occurs with reintroduction of minocycline. It is important for primary care providers to consider minocycline-induced autoimmune hepatitis when liver injury develops during minocycline therapy.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2007년도 Proceedings of ISRS 2007
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• pp.118-121
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• 2007

In recent years, the hyperspectral instruments with high spatial and high spectral resolution have become an important component of wide variety of earth science applications. The primary mission of the proposed Compact Airborne Imaging Spectrometer System (CAISS) in this study is to acquire and provide full contiguous spectral information with high quality spectral and spatial resolution for advanced applications in the field of remote sensing. The CAISS will also be used as the vicarious calibration equipment for the cross-calibration of satellite image data. The CAISS consists of six physical units: the camera system, the Jig, the GPS/INS, the gyro-stabilized mount, the operating system, and the power inverter and distributor. Additionally, the calibration instruments such as the integrated sphere and spectral lamps are also prepared for the radiometric and spectral calibration of the CAISS. The CAISS will provide high quality calibrated image data that can support evaluation of satellite application products. This paper summarizes the design, development and major characteristic of the CAISS.

• 한국정보통신학회논문지
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• 제15권1호
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• pp.41-50
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• 2011

DNS(Domain Name System)는 인터넷상의 호스트의 도메인주소를 IP주소로 변환하거나 IP주소를 도메인주소로 변환하는 이름해결 메카니즘을 총칭한다. 본 논문에서는 1차 DNS 서버가 오류로 인해 정지하더라도 2차 DNS 서버가 대신하여 서비스를 지속할 수 있도록 하는 결함내성을 갖는 DNS 시스템 구축에 관해 연구하였다.

• Bulletin of the Korean Chemical Society
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• 제34권1호
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• pp.252-254
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• 2013

• 한국군사과학기술학회지
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• 제17권1호
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• pp.142-148
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• 2014

The mirror which is considered in designing a MFD is off-axis primary one and its dimension is wide 556mm height 345mm. The MFD(Mirror Fixation Device) load specification is generated for the high resolution mirror. The optical WFEs for unit loads are calculated from mirror sensitivity analysis and they are compared with allocated allowable optical WFE. The parasite load for the MFD is calculated from their comparison. The MFD compliant with the parasite load is designed.