• 천문학회보
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• 제41권2호
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• pp.48.2-48.2
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• 2016

The wide-field and the round-the clock operation capabilities of the KMTNet enables the discovery, astrometry and follow-up physical characterization of asteroids and comets in a most efficient way. We collectively refer to the team members, partner organizations, the dedicated software subsystem, the computing facility and research activities as Deep Ecliptic Patrol of the Southern Sky (DEEP-South). Most of the telescope time for DEEP-South is devoted to targeted photometry of Near Earth Asteroids (NEAs) to push up the number of the population with known physical properties from several percent to several dozens of percent, in the long run. We primarily adopt Johnson R-band for lightcurve study, while we employ BVI filters for taxonomic classification and detection of any possible color variations of an object at the same time. In this presentation, the progress and new findings since the last KAS meeting will be outlined. We report DEEP-South preliminary lightcurves of several dozens of NEAs obtained at three KMTNet stations during the first year runs. We also present a physical model of asteroid (5247) Krylov, the very first Non principal Axis (NPA) rotator that has been confirmed in the main belt (MB). A new asteroid taxonomic classification scheme will be introduced with an emphasis on its utility in the LSST era. The progress on the current version of automated mover detection software will also be summarized.

• 한국통신학회논문지
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• 제31권7C호
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• pp.743-754
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• 2006

본 논문에서는 두 개의 다른 밀리미터 파장을 적용하는 광전계통의 구조 변경을 시도하고 신호 흡수나 환경적 간섭 왜곡에 취약한 싱글 빔(single beam) 레이저 방식의 단점을 보완한 듀얼 빔(dual beam) 방식의 레이저 레이더 시스템을 제안한다. 본 논문에서 제한 한 듀얼 빔 방식 레이더 시스템은 적은 신호 검파의 신뢰성 측면에서 통계적이며 분석적인 방법으로 제안하여 시스템의 우수성을 입증하고 AWGN 배경 잡음과 흡수 또는 간섭에 의해 레이저 신호의 왜곡이 발생하는 채널환경에서 시뮬레이션을 수행함으로써 신호 검파의 신뢰성 향상이 가능하다는 분석적 결과에 대한 정량적 재검증을 한다.

• 전기전자학회논문지
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• 제22권2호
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• pp.281-288
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• 2018

본 논문에서는 쿠다(CUDA)를 사용하여 GPU 리소스를 분배하는 지능형 얼굴 인식 및 트래킹 시스템을 제안한다. 제안한 시스템은 GPU 리소스를 최적의 상태로 분배하는 GPU 할당 알고리즘, 딥러닝을 이용한 얼굴 영역 검출, 딥러닝을 이용한 얼굴 인식, 실시간 얼굴 트래킹, PTZ 카메라 제어 등의 5단계로 구성되어진다. 멀티 GPU 리소스를 최적의 상태로 분배하는 GPU 할당 알고리즘은 고정적으로 스레드에 GPU를 할당하는 방식과 달리 GPU의 활성화 정도에 따라 유동적으로 GPU 리소스를 분배한다. 따라서 안정적이고 효율적인 멀티 GPU 사용을 가능하게 하는 특징이 있다. 제안된 시스템에 대한 성능을 평가하기 위하여 리소스 분배를 하지 않은 시스템과 제안한 시스템을 비교한 결과, 리소스를 분배하지 않은 시스템은 불안정한 동작을 보이는 반면에 제안한 시스템에서는 안정적으로 구동됨으로서 효율적인 리소스 사용을 보였다. 따라서 제안된 시스템의 효용성이 입증되었다.

• 분석과학
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• 제23권2호
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• pp.172-178
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• 2010

Glutathione S-transferase는 식물의 해독작용에 중추적인 역할을 하는 화학 효소이다. 본 연구에서는 제초제 검출 키트 개발에 응용을 위하여 식물 해독작용에 중추적인 역할을 하는 glutathione Stransferase의 고정화 방법을 연구하였다. Chloroacetanilide계 제초제에 높은 효소 활성을 보이는 벼 유래 OsGSTF3에 공유결합을 통한 polystyrene-alkylamine 비드와 리간드결합을 통한 agarose-aminoalkyl 비드,포괄법을 통한 Na-alginate 비드를 이용하여 고정화를 실시하였다. 정제된 OsGSTF3 10 mg을 사용하여 고정화 하였을 때 0.62 mg/g 비드로 polystyrene-alkylamine에 가장 효율적으로 고정화 되었다. 고정화 된 OsGSTF3의 효소 활성은 야생형의 30%를 나타내었으며, 재사용에 의한 효소활성 측정시 3회 까지 처음 활성의 80% 이상을 유지하였다.

• 융합신호처리학회논문지
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• 제23권2호
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• pp.62-69
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• 2022

의료현장에서는 최근 디지털 헬스케어의 중요성이 대두되면서, 다양한 형태의 생체신호 측정 관련 연구가 활발히 진행되고 있다. 생체신호 중 가장 중요한 신호로 심전도를 들 수 있으며, 특히 부정맥 환자에 있어 심전도 신호의 연속 모니터링은 매우 중요하다. 부정맥은 동결절(sinus node), 동빈맥(sinus tachycardia), 심방조기수축(atrial premature beat, APB), 심실세동 (ventricular fibrillation) 등으로 그 발병원에 따른 형태가 다양하며, 발병 이후의 예후가 좋지 않으므로 일상 중 연속 모니터링은 부정맥의 조기 진단과 치료방향 설정에서 매우 중요하다. 부정맥 환자의 심전도 신호는 매우 불안정하며, 부정맥을 자동 검출하기 위한 주요 특징점으로 작용하는 정확한 R-peak 포인트의 검출이 어렵다. 본 연구에서는 연속 측정하는 홀터 심전도 모니터링 기기와 분석용 소프트웨어를 개발하였으며, 부정맥 데이터베이스를 통해 심전도 신호의 R-peak 효용성을 확인하였다. 향후 연구에서는 다양한 발병원인으로 인한 부정맥의 형태적 구분 및 예측을 위한 알고리즘과 임상 데이터에 근거한 유효성 검증에 관한 추가 연구가 필요하다.

• 국제학술발표논문집
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• The 5th International Conference on Construction Engineering and Project Management
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• pp.634-639
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• 2013

The aim of the study is to develop the 3D visualization of Building Information Model and integrated 4D model for optimization of resources in the construction project. This study discuss the process of methodology and creation of 4D model of the project and simulate it to monitor the workflow at the site. Different stages of the construction process and activities are generated by using Revit and MS Project. MS project has been used for creation of the schedules and these are linked with the Revit for 3D modeling. The time used as the fourth dimension and 4D model created by using Navisworks Time liner software. Narges shopping center is presented as a case study to realize the actual uses and benefits of Building Information Model (BIM). Narges shopping mall is located in Tehran, Iran. As a part of Hekmat master plan, Narges shopping center is an 11 stores building with a total area of 30000 Sq.m. This shopping and entertainment center is comprised of 150 retails and two multi-use public halls with a capacity of 400 persons each and underground parking with total 400 parking space. The main purpose of architecture was to create an urban public center along with its revolving, spiral like form and an ever changing continuous façade by means of different colors, materials, which is in harmony with the other building of the master plan. The approximate cost of the project is $17 million and duration of the project schedule is 30 months. The developed Building Information Model enabled us to identify the potential collisions or clashes between various structural and architectural systems. 4D model has been used for limiting the interaction between subcontractors installing the different systems so rework could be avoided and productivity maximized. It is also observed that the utility of BIM for construction stimulation and clash detection is the best suitable method. Clash detection before the implementation of work is highly recommended to avoid rework.

• Korean Journal of Radiology
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• 제22권4호
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• pp.513-524
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• 2021

Objective: To assess the noncontrast two-dimensional single-shot balanced turbo-field-echo magnetic resonance angiography (b-TFE MRA) features of the abdominal aortic aneurysm (AAA) status following endovascular aneurysm repair (EVAR) and evaluate to detect endoleaks (ELs). Materials and Methods: We examined four aortic stent-grafts in a phantom study to assess the degree of metallic artifacts. We enrolled 46 EVAR-treated patients with AAA and/or common iliac artery aneurysm who underwent both computed tomography angiography (CTA) and b-TFE MRA after EVAR. Vascular measurements on CTA and b-TFE MRA were compared, and signal intensity ratios (SIRs) of the aneurysmal sac were correlated with the size changes in the AAA after EVAR (AAA prognoses). Furthermore, we examined six feasible b-TFE MRA features for the assessment of ELs. Results: There were robust intermodality (r = 0.92-0.99) correlations and interobserver (intraclass correlation coefficient = 0.97-0.99) agreement. No significant differences were noted between SIRs and aneurysm prognoses. Moreover, "mottled high-intensity" and "creeping high-intensity with the low-band rim" were recognized as significant imaging findings suspicious for the presence of ELs (p < 0.001), whereas "no signal black spot" and "layered high-intensity area" were determined as significant for the absence of ELs (p < 0.03). Based on the two positive features, sensitivity, specificity, and accuracy for the detection of ELs were 77.3%, 91.7%, and 84.8%, respectively. Furthermore, the k values (0.40-0.88) displayed moderate-to-almost perfect agreement. Conclusion: Noncontrast MRA could be a promising imaging modality for ascertaining patient follow-up after EVAR.

• 한국태양에너지학회 논문집
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• 제39권1호
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• pp.59-66
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• 2019

BIPV or BAPV installation applied to building is increasing through public utility mandates enterprise. Solar PV energy generates only during the day, but if it is operated in convergence with ESS, which stores electrical energy, it can restrain the fossil energy used in buildings throughout the day. A solution is to converge with PV system and ESS. However, PV systems and ESS connected to the power grid in parallel can cause problems of electrical stability. A study was conducted on the case of failure to detect islanding operation under the parallel operation of PV generation and ESS that are connected in parallel to power grid. Experiments conducted various non-islanding detections under the operating conditions. In the experiment results, when one PCS - PV inverter or ESS inverter - was operating under the islanding condition, it stopped working within 0.5 seconds of the Korean grid standard. However, when both of PV inverter and ESS inverter were operating at the same time under the islanding situation, the anti-islanding algorithm did not operate normally and both inverters continuously supplied power to the connected RLC loads. islanding detection Algorithm developed by each inverter manufacturer has caused this phenomenon. Therefore, this paper presented a new test standard for islanding detection.

• Journal of Ecology and Environment
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• 제31권2호
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• pp.153-159
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• 2008

The timing of the canopy phenology onset (CPO hereafter) indicates the initiation of the growing season, with rapid increases in exchange rates of carbon dioxide and water vapor between vegetation and atmosphere. The CPO is regarded as a potential indicator of ecosystem responses to global warming, but the CPO shows considerable spatial variation depending on the species composition and local temperature regime. at a given geographic location. In this study, we evaluated the utility of satellite observation data for detection of the timing of the CPO. Leaf area indices (LAI) obtained from the Moderate Resolution Imaging Spectrora-diometer (MODIS) were utilized to detect and map the onset dates from 2001 to 2006. The reliability of MODIS-based onset dates was evaluated with ground measured cherry blossom flowering data from national weather stations. The MODIS onset dates preceded the observed flowering dates by 8 days and were linearly related with a correlation coefficient of 0.58 (p < 0.05). In spite of the coarse spatial (1 km) and temporal (8 days) resolutions of MODIS LAI, the MODIS-based onset dates showed reasonable ability to predict flowering dates.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 춘계학술대회 논문집
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• pp.95-100
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• 2006

Measurements of ocean color from space since 1970s provided vital information with reference to physical and biogeochemical properties of the oceanic waters. The utility of these data has been explored in order to map and monitor highly toxic/or harmful algal blooms (HABs) that affected most of coastal waters throughout the world due to accelerated eutrophication from human activities and certain oceanic processes. However, the global atmospheric correction and bio-optical algorithms developed for oceanic waters were found to yield false information about the HABs in coastal waters. The present study aimed to evaluate the potential use of red tide index (RI) method, which has been developed by Ahn and Shanmugam (2005), for mapping of HABs in Korean and neighboring waters. Here we employed the SSMM to remove the atmospheric effect in the SeaWiFS image data and the achieved indices by RI method were found more appropriate in correctly identifying potential areas of the encountered HABs in Korean South Sea (KSS) and Chinese coastal waters during 1999-2004. But the existence of high absorbing and scattering materials greatly interfered with the standard OC4 algorithm which falsely identified red tides in these waters. In comparison with other methods, the RI approach for the early detection of HABs can provide state managers with accurate identification of the extent and location of these blooms as a management tool.