• Title, Summary, Keyword: LAPS

Search Result 60, Processing Time 0.03 seconds

Improvements in the Simulation of Sea Surface Wind Over the Complex Coastal Area-II: Data Assimilation Using LAPS (복잡 해안지역 해상풍 모의의 정확도 개선-II: LAPS를 사용한 자료동화)

  • Bae, Joo-Hyun;Kim, Yoo-Keun;Jeong, Ju-Hee;Kweon, Ji-Hye;Seo, Jang-Won;Kim, Yong-Sang
    • Journal of Environmental Science International
    • /
    • v.15 no.8
    • /
    • pp.745-757
    • /
    • 2006
  • We focus on the improvement of accuracy of sea surface wind over complex coastal area doling the warm season. Local Analysis Prediction System (LAPS) was used to improve the initial values in Mesoscale Meteorological model (MM5). During the clear summer days with weak wind speed, sea surface wind simulated with LAPS was compared with the case without LAPS. The results of modeling with LAPS has a good agreement mesoscale circulation such as mountain and valley winds on land and in case of modeling without LAPS, wind speed overestimated over the sea in the daytime. And the results of simulation with LAPS indicated similar wind speed values to observational data over the sea under influence of data assimilation using BUOY, QuikSCAT, and AMEBAS. The present study suggests that MM5 modelling with LAPS showed more improved results than that of without LAPS to simulate sea surface wind over the complex coastal area.

Fabrication and pH response characteristics of LAPS(Light addressable potentiometric sensor) with electrolyte/$Si_3N_4/SiO_2$/Si structure (Electrolyte/$Si_3N_4/SiO_2/Si$ 구조의 LAPS 제작 및 pH 응답특성)

  • Chang Su-Won;Koh Kwang-Nak;Kang Shin-Won
    • Journal of the Korean Electrochemical Society
    • /
    • v.1 no.1
    • /
    • pp.40-44
    • /
    • 1998
  • The LAPS device of fast response and high sensitivity, based on electrochemical potential difference, and its system were fabricated for the precise measurement of pH changes and its characteristic were investigated. The electrostatic variation characteristics of LAPS according to the pH changes and parameters in the device were verified through a simulation using LAPS equivalent circuit model. The LAPS device and its system were fabricated on the basis of the result of simulation. The fabricated LAPS system showed linear sensitivity (about 56 mV/pH within the range of pH 2 to pH 11. In order to overcome the defect of general urea sensor (especially slow response time), urease immobilized nitrocellulose membrane was attached on the LAPS and resulted in the very fast response time, 0.29 mV/sec, 0.86 mV/sec at urea concentration of $50{\mu}g/ml,\; 500{\mu}g/ml$, respectively. And also in order to measure the uranyl ion, the uranyl ion selective sensing membrane with calix[6]arene derivative was used and its sensitivity was 25mV/concentration decade in the wide uranyl ion concentration range of $10^{-11}M\;to\;10^{-4}M$.

NEW COMPLEXITY ANALYSIS OF PRIMAL-DUAL IMPS FOR P* LAPS BASED ON LARGE UPDATES

  • Cho, Gyeong-Mi;Kim, Min-Kyung
    • Bulletin of the Korean Mathematical Society
    • /
    • v.46 no.3
    • /
    • pp.521-534
    • /
    • 2009
  • In this paper we present new large-update primal-dual interior point algorithms for $P_*$ linear complementarity problems(LAPS) based on a class of kernel functions, ${\psi}(t)={\frac{t^{p+1}-1}{p+1}}+{\frac{1}{\sigma}}(e^{{\sigma}(1-t)}-1)$, p $\in$ [0, 1], ${\sigma}{\geq}1$. It is the first to use this class of kernel functions in the complexity analysis of interior point method(IPM) for $P_*$ LAPS. We showed that if a strictly feasible starting point is available, then new large-update primal-dual interior point algorithms for $P_*$ LAPS have $O((1+2+\kappa)n^{{\frac{1}{p+1}}}lognlog{\frac{n}{\varepsilon}})$ complexity bound. When p = 1, we have $O((1+2\kappa)\sqrt{n}lognlog\frac{n}{\varepsilon})$ complexity which is so far the best known complexity for large-update methods.

Evaluation of Two Types of Biosensors for Immunoassay of Botulinum Toxin

  • Choi, Ki-Bong;Seo, Won-Jun;Cha, Seung-Hee;Choi, Jung-Do
    • BMB Reports
    • /
    • v.31 no.1
    • /
    • pp.101-105
    • /
    • 1998
  • Immunoassay of botulinum toxin (BTX) B type was investigated using two typed of biosensors: light addressable potentiometric sensor (LAPS) and surface plasmon resonance (SPR) sensor. Urease-tagged and immuno-filtration capture method have been used for LAPS. Tag-free and direct binding real-time detection method have been used for SPR sensor. The detection limit of sandwich assay format with LAPS was 10 ng/ml, which was the lowest among methods tested. SPR has the advantage of being more convenient because tag-free direct binding assay can be used and reaction time was reduced, regardless of low sensitivity. This result shows that sandwich assay format with LAPS can be used as an alternative method of BTX mouse bioassay which is known as the most sensitive method for the detection of BTX.

  • PDF

Implementation of Multichannel LAPS and Measurement System for Detection of the pH Variation Using an Implemented Device. (다채널 LAPS 제작 및 이를 이용한 pH 변화량 검출 시스템 구현)

  • Bae, Sang-Kon;Park, Il-Yong;Park, Young-Sik;Jang, Soo-Won;Lee, Sung-Ha;Kang, Shin-Won;Cho, Jin-Ho
    • Journal of Sensor Science and Technology
    • /
    • v.10 no.4
    • /
    • pp.239-249
    • /
    • 2001
  • LAPS is a device which is dependent on the bias potential between a pH sensitivity and alternating photocurrent. We implemented the multichannel LAPS device and the detection system which was able to effectively measure the sensor's output by a synchronized detection circuit and multiple methods. The implemented LAPS was structured the multiple sensing sites for analyzing a various components simultaneously. And the system included a time-division method using one pre-amplifier being able to detect the multichannel pH concentration preserving a high S/N ratio and a control part. System hardware consists of a pre-amplifier, digital unit and sensor unit, and software consists of a system program and PC program. As results, we verified the successful operations of system including an implemented pre-amplifier and signal processing units.

  • PDF

High Resolution Gyeonggi-do Agrometeorology Information Analysis System based on the Observational Data using Local Analysis and Prediction System (LAPS) (LAPS와 관측자료를 이용한 고해상도 경기도 농업기상정보 분석시스템)

  • Chun, Ji-Min;Kim, Kyu-Rang;Lee, Seon-Yong;Kang, Wee-Soo;Park, Jong-Sun;Yi, Chae-Yon;Choi, Young-Jean;Park, Eun-Woo;Hong, Sun-Sung
    • Korean Journal of Agricultural and Forest Meteorology
    • /
    • v.14 no.2
    • /
    • pp.53-62
    • /
    • 2012
  • Demand for high resolution weather data grows in the agriculture and forestry fields. Local Analysis and Prediction System (LAPS) can be used to analyze the local weather at high spatial and temporal resolution, utilizing the data from various sources including numerical weather prediction models, wind or temperature profilers, Automated Weather Station (AWS) networks, radars, and satellites. LAPS has been set to analyze weather elements such as air temperature, relative humidity, wind speed, and wind direction every hour at the spatial resolution of $100m{\times}100m$ for Gyeonggi-do on near real-time basis. The AWS data were revised by adding the agricultural field AWS data (33 stations) in addition to the KMA data. The analysis periods were from 1 to 31 August 2009 and from 15 to 21 February 2010. The comparison of the LAPS output showed the smaller errors when using the agricultural AWS observation data together with the KMA data as its input data than using only either the agricultural or KMA AWS data. The accuracy of the current system needs improvement by further optimization of analyzing options of the system. However, the system is highly applicable to various fields in agriculture and forestry because it can provide site specific data with reasonable time intervals.

Algorithm for Integral Method for Photocurrent Measurement of pH Variations Using Multichannel LAPS (다채널 LAPS용 pH 변화량 검출을 위한 적분 방식의 알고리듬 제안)

  • Bae, Sang-Kon;Lee, Sung-Ha;Kang, Shin-Won;Cho, Jin-Ho
    • Journal of the Institute of Electronics Engineers of Korea SC
    • /
    • v.38 no.6
    • /
    • pp.65-75
    • /
    • 2001
  • We proposed the detection method of pH variations by integrating a photocurrent characteristic curve, instead of finding an inflection point by differentiating it in LAPS system. By a simulation of the performance of the proposed method, we verified that it had 80 and 1000 times higher sensitivity and resolution than a conventional method. Then, with the implemented system based on the simulation results, we measured a pH variation which was given rise to a potential change on the LAPS surface exposed to 2-0.03125[mg/ml] enzyme solutions. As results, we observed that the proposed method has a higher sensitivity and resolution of 3.76-0.08[pH/min] pH variations than 3.79-0.27[pH/min] for conventional method with same samples.

  • PDF

The Effects of the Changed Initial Conditions on the Wind Fields Simulation According to the Objective Analysis Methods (객관분석기법에 의한 바람장 모의의 초기입력장 변화 효과 분석)

  • Kim, Yoo-Keun;Jeong, Ju-Hee;Bae, Joo-Hyun;Kwun, Ji-Hye;Seo, Jang-Won
    • Journal of Environmental Science International
    • /
    • v.15 no.8
    • /
    • pp.759-774
    • /
    • 2006
  • We employed two data assimilation techniques including MM5 Four Dimensional Data Asssimilation (FDDA) and Local Analysis and Prediction System (LAPS) to find out the effects of the changed inetial conditions on the wind fields simulation according to the objective analysis methods. We designed 5 different modeling cases. EXP B used no data assimilation system. Both EXP Fl using surface observations and EXP F2 with surface and upper-air observations employed MM5 FDDA. EXP Ll using surface observations and EXP L2 with surface and upper-air observations used LAPS. As results of, simulated wind fields using MM5 FDDA showed locally characterized wind features due to objective analysis techniques in FDDA which is forcefully interpolating simulated results into observations. EXP Fl represented a large difference in comparison of wind speed with EXP B. In case of LAPS, simulated horizontal distribution of wind fields showed a good agreement with the patterns of initial condition and EXP Ll showed comparably lesser effects of data assimilation of surface observations than EXP Fl. When upper-air observations are applied to the simulations, while MM5 FDDA could hardly have important effects on the wind fields simulation and showed little differences with simulations with merely surface observations (EXP Fl), LAPS played a key role in simulating wind fields accurately and it could contribute to alleviate the over-estimated winds in EXP Ll simulations.

Numerical Study on the Sensitivity of Meteorological Field Variation due to Radar Data Assimilation (레이더 자료동화에 따른 기상장모의 민감도에 관한 수치연구)

  • Lee Soon-Hwan;Park Geun-Yeong;Ryu Chan-Su
    • Journal of Environmental Science International
    • /
    • v.15 no.1
    • /
    • pp.9-19
    • /
    • 2006
  • The purpose of this research is development of radar data assimilation observed at Jindo S-band radar The accurate observational data assimilation system is one of the important factors to meteorological numerical prediction of the region scale. Diagnostic analysis system LAPS(Local Analysis and Prediction System) developed by US FSL(Forecast Systems Laboratory) is adopted assimilation system of the Honam district forecasting system. The LAPS system was adjusted in calculation environment in the Honam district. And the improvement in the predictability by the application of the LAPS system was confirmed by the experiment applied to Honam district local severe rain case of generating 22 July 2003. The results are as follows: 1) Precipitation amounts of Gwangju is strong associated with the strong in lower level from analysis of aerological data. This indicated the circulation field especially, 850hPa layer, acts important role to precipitation in Homan area. 2) Wind in coastal area tends to be stronger than inland area and radar data show the strong wind in conversions zone around front. 3) Radar data assimilation make the precipitation area be extended and maximum amount of precipitation be smaller. 4) In respect to contribution rate of different height wind field on precipitation variation, radar data assimilation of upper level is smaller than that of lower level.

Improvement in the Simulation of Wind Fields Over the Complex Coastal Area, Korea (한반도 복잡 해안지역의 바람장 모의 개선)

  • Kim, Yoo-Keun;Bae, Joo-Hyun;Jeong, Ju-Hee;Kweon, Ji-Hye;Seo, Jang-Won;Kim, Yong-Sang
    • Journal of Environmental Science International
    • /
    • v.15 no.5
    • /
    • pp.417-430
    • /
    • 2006
  • We focused on improvement in simulation of wind fields for the complex coastal area. Local Analysis and Prediction System(LAPS) was used as a data assimilation method to improve initial conditions. Case studies of different LAPS inputs were performed to compare improvement of wind fields. Five cases have been employed : I) non data assimilation, II) all available data, III) AWS, buoy, QuikSCAT, IV) AWS, buoy, wind profiler, V) AWS, buoy, AMEDAS. Data assimilation can supplement insufficiency of the mesoscale model which does not represent detailed terrain effect and small scale atmospheric flow fields. Result assimilated all available data showed a good agreement to the observations rather than other cases and estimated veil the local meteorological characteristics including sea breeze and up-slope winds. Result using wind profiler data was the next best thing. This implies that data assimilation with many high-resolution sounding data could contribute to the improvements of good initial condition in the complex coastal area. As a result, these indicated that effective data assimilation process and application of the selective LAPS inputs played an important role in simulating wind fields accurately in a complex area.