• Journal of Environmental Health Sciences
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• 제28권1호
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• pp.1-10
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• 2002

This study was carried out to provide environmental information using geographic information system for the environmental manager engaged in governmental office. Point and nonpoint sources were classified by each small watershed and an administrative district. ArcView and ERDAS software were used to develop environmental information system. Small watershed was extracted into the DTEM using HEC-geoHMS which is ArcView extension. Study area was divided into 7 small watershed. Point sources were constituted as cattle, milk cattle, swine, and poultry. Land use was divided into forests, rice paddies, residential sites et al. User interface was designed to search information easily for the nonprofessional GIS users.

• Convergence Security Journal
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• 제7권4호
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• pp.23-28
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• 2007

In this research, we suggest the unknown intrusion detection system with SVM(Support Vector Machines). At the system, at first, collected training-packets are processed through packet image creating module. And then, it is studied by the SVM module. Finally, the studied SVM module classifies the test-data unsing test-packet-image. This system's stability and efficient characteristic of security is far superior than the existing it.

• Proceedings of the KIEE Conference
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• 대한전기학회 2003년도 하계학술대회 논문집 B
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• pp.1374-1376
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• 2003

The output of solar cell or array depends on the weather conditions such as cell temperature and insolation level. If the output of the photovoltaic system would be regularly generated under any weather conditions, it is so easy to develop the inverter, its related system, and also control algorithm. This can be performed by the VISC(virtual-implemented solar cell) system studied in this paper. And a few I-V curves are provided by the manufacturers, and so any I-V value between the given curves is unknown. The new model for solar cell is proposed which is based on the interpolation. Both simulation and experiment are executed to show the validity of the proposed VISC system.

• Electronics and Telecommunications Trends
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• 제38권2호
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• pp.12-25
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• 2023

Positioning, navigation, and timing information has become a key element in the national core infrastructure and for emerging technologies, such as autonomous driving, lunar exploration, financial systems, and drones. Therefore, the provision of that information by navigation satellite systems is becoming increasingly important. Existing systems such as GPS (Global Positioning System), GLONASS (GLObal NAvigation Satellite System), and BDS (BeiDou Navigation Satellite System) also provide augmentation, safety-of-life, search & rescue and short message communication and authentication services to increase their competitiveness. Those services and the signals generated for their provision have their own purpose and requirements. This article presents an overview of existing or planned satellite navigation satellite system services and signals, aiming to help understand their current status.

• The Bulletin of The Korean Astronomical Society
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• 제46권2호
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• pp.53.3-53.3
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• 2021

Adaptive Optics (AO) was first studied in the field of astronomy, and its applications have been extended to the field of laser, microscopy, bio, medical, and free space laser communication. AO modelling and simulation are required throughout the system development process. It is necessary not only for proper design but also for performance verification after the final system is built. In KASI, we are trying to develop the AO Python Package for AO modelling and simulation. It includes modelling classes of atmosphere, telescope, Shack-Hartmann wavefront sensor, deformable mirror, which are the components for an AO system. It also includes the ability to simulate the entire AO system over time. It is being developed in the Super Eye Bridge project to develop a segmented mirror, an adaptive optics, and an emersion grating spectrograph, which are future telescope technologies. And it is planned to be used as a performance analysis system for several telescope projects in Korea.

• Mass Spectrometry Letters
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• 제5권1호
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• pp.24-29
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• 2014

An advanced and reliable high performance liquid chromatography (HPLC)/ultraviolet detector (UV)/ion-trap time-of-flight (IT-TOF) mass spectrometry was developed for the simultaneous quantification of 19 marker compounds in Bang-poong-tong-sung-san (BPTS), a traditional oriental prescription. Various parameters affecting HPLC separation and IT-TOF detection were investigated, and optimized conditions were identified. The separation was achieved on a Capcell PAK C18 column ($1.5mm{\times}250mm$, $5{\mu}m$ particle size) using a gradient elution of acetonitrile and water containing 0.1% formic acid at a flow rate of 0.1 mL/min. The column temperature was maintained at $40^{\circ}C$ and the injection volume was $2{\mu}L$. IT-TOF system was equipped with an electrospray ion source (ESI) operating in positive or negative ion mode. The optimized electrospray ionization parameters were as follows: ion spray voltage, +4.5 kV (positive ion mode), or -3.5 kV (negative ion mode); drying gas ($N_2$), 1.5 L/min; heat block temperature, $200^{\circ}C$. Automatic $MS^n$ (n = 1~3) analyses were carried out to obtain structural information of analytes. Elemental compositions and their mass errors were calculated based on their accurate masses obtained from a formula predictor software. The marker compounds in BPTS were identified by comparisons between $MS^n$ spectra from standards and those from extracts. Moreover, the libraries of $MS^2$ and $MS^3$ spectra and accurate masses of parent and fragment ions for marker compounds were constructed. The developed method was successfully applied to the BPTS extracts and identified 17 out of 19 marker compounds in the BPTS extracts.

• The Korea Journal of Herbology
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• 제34권5호
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• pp.29-37
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• 2019

Objectives : Bang-poong (Saposhnikovia divaricata; SD) was traditionally used to treat inflammatory disorders. In this study, we aimed to investigate whether Bang-poong and related species including SD, Glehnia littoralis (GL), and Peucedanum japonicum (PJ) possess neuroprotective effects and acetylcholinesterase (AChE) inhibitory activities. Methods : Roots of SD, GL and PJ were extracted with distilled water (DW) or 70% ethanol (EtOH). We assessed 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging activities of the extracts. To examine neuroprotective effects, we measured cell viability in PC12 or HT22 cells after treatment of the extracts with $H_2O_2$ or amyloid-beta ($A{\beta}$). To assess anti-neuroinflammatory effects, we measured the nitric oxide (NO) levels after treatment with the extracts and lipopolysaccharide (LPS) in BV2 microglial cells. In addition, we performed AChE inhibition assay to explore effects of the extracts on the cholinergic system. Results : DW and EtOH extracts of SD, GL and PJ showed mild DPPH free radical scavenging activities. Also, DW extracts of GL and PJ showed protective effects against $H_2O_2$-induced toxicity in PC12 cells. In LPS-activated BV2 cells, EtOH extracts of SD, GL and PJ exerted inhibitory effects on NO production. Meanwhile, DW extracts of SD, GL and PJ inhibited the $A{\beta}$-induced cell death in HT22 cells. In addition, DW and EtOH extracts of GL exhibited remarkable inhibitory activities on AChE. Conclusions : We demonstrated that SD, GL and PJ exert anti-oxidative, anti-neuroinflammatory and AChE inhibitory activities. These results indicate that SD, GL and PJ could be potential candidates for neurological disorders.

• The Journal of the Society of Stroke on Korean Medicine
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• 제24권1호
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• pp.41-54
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• 2023

■Objectives This study is to report the effectiveness of Korean medicine on the treatment for multiple system atropy(MSA-C) patient complaining of autonomic dysfunction. ■Methods The patient was treated with Korean medicine(mainly DokhwalJihwang-tang Gami-bang) for 39 days. The evaluations were performed using UMSARS(Unified Multiple System Atrophy Rating Scale), SCOPA-AUT(The Scale for Outcomes in Parkinson's disease-Autonomic), K-OGS(Korean version of the Orthostatic Grading Scale). ■Results After treatment, the UMSARS score decreased from 25 to 18, the SCOPA-AUT score decreased from 21 to 14, K-OGS score decrease from 15 to 8. ■Conclusion This case suggests that Korean medicine treatment may be effective for MSA-C patients with autonomic dysfuction.

• Electronics and Telecommunications Trends
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• 제24권3호
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• pp.61-68
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• 2009

UHDTV와 함께 HDTV 이후의 차세대 방송기술로서 전세계적으로 연구되고 있는 3DTV 방송 기술은 시청자에게 보다 사실적 이고 현장감 있는 3D 비디오 콘텐츠를 제공한다. 최근 미국 헐리우드를 중심으로 활성화되고 있는 3D 입체 영화 시장 성장, 다수의 디스플레이 업체들에 의한 3D 지원 디스플레이 발표, 휴대단말에서의 3D 데이터 및 비디오 서비스, 가정에서의 3D 비디오 서비스를 위한 3D@Home 표준화 작업, 3D4YOU를 중심으로 한 3D 비디오 콘텐츠의 생성기술과 배포 포맷에 관한 연구, 다시 점 3DTV 서비스 등을 위한 MPEG에서의 3DV 표준화 등 관련 기술 개발 및 표준화가 이뤄지고 있다. 본 고에서는 MPEG 3DV 그룹에서 진행중인 3DV부호화 기술 표준화 진행 현황과 기고 주요 기술에 대해 설명하고, 향후 3D 비디오 표준화 진행 전망에 대해 다루기로 한다.

• KSCE Journal of Civil and Environmental Engineering Research
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• 제5권4호
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• pp.87-94
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• 1985

Dynamic analysis of guyed tower is presented in this paper. The scope of the study is twofold. The one is to determine an efficient analysis method to include the nonlinearity of the mooring system and the nonlinear hydrodynamic wave forces. The other is to investigate the sensitivity of two major design parameters, that is the stiffness of mooring system and the fixity condition of the tower at mud line. Time history analysis method utilizing mode superposition is mainly considered. However several other methods are also used for the purpose of comparison. Analyses are carried out using the Lena Guyed Tower, which is the first structure of this kind, as a standard structure.