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Optimizing multi-parameter distributed fiber sensors:a hybrid Rayleigh-Brillouin-Raman System approach

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Light(Science & Applications) 2024年第3期13卷 393-395页

作者： kwang Yong song Dept.of Physics Chung-Ang University84 Heukseok-roDongjak-guSeoul 06974Korea

An optimized single-end hybrid Rayleigh,Brillouin,and Raman distributed fiber sensing system has been developed for simultaneous measurement of multiple *** system integrates 3-bit pulse coding for the Raman signal and the Brillouin amplification of the Rayleigh-backscattered signal,discriminating strain,temperature,and vibration using a single sensing fiber.

关键词： fiber Rayleigh signal

Global parameter estimation of the Cochlodinium polykrikoides model using bioassay data

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Acta Oceanologica Sinica 2016年第2期35卷 39-45页

作者： CHO Hong-Yeon PARK kwang-soon KIM Sung Coastal and Environmental Engineering Division Korea Institute of Ocean Science and Technology Coastal Disaster Research Center Korea Institute of Ocean Science and Technology Biological Oceanography and Marine Biology Division Korea Institute of Ocean Science and Technology

Cochlodinium polykrikoides is a notoriously harmful algal species that inflicts severe damage on the aquacultures of the coastal seas of Korea and Japan. Information on their expected movement tracks and boundaries of influence is very useful and important for the effective establishment of a reduction plan. In general, the information is supported by a red-tide（a.k.a algal bloom） model. The performance of the model is highly dependent on the accuracy of parameters, which are the coefficients of functions approximating the biological growth and loss patterns of the C. polykrikoides. These parameters have been estimated using the bioassay data composed of growth-limiting factor and net growth rate value pairs. In the case of the C. polykrikoides, the parameters are different from each other in accordance with the used data because the bioassay data are sufficient compared to the other algal species. The parameters estimated by one specific dataset can be viewed as locally-optimized because they are adjusted only by that dataset. In cases where the other one data set is used, the estimation error might be considerable. In this study, the parameters are estimated by all available data sets without the use of only one specific data set and thus can be considered globally optimized. The cost function for the optimization is defined as the integrated mean squared estimation error, i.e., the difference between the values of the experimental and estimated rates. Based on quantitative error analysis, the root-mean squared errors of the global parameters show smaller values, approximately 25%–50%, than the values of the local parameters. In addition, bias is removed completely in the case of the globally estimated parameters. The parameter sets can be used as the reference default values of a red-tide model because they are optimal and representative. However, additional tuning of the parameters using the in-situ monitoring data is highly *** opposed to the bioassay d

关键词： global and local estimation gain and loss parameters Cochlodinium polykrikoides bioassay data model performance

Microalgae Scenedesmus obliquus as renewable biomass feedstock for electricity generation in microbial fuel cells （MFCs）

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Frontiers of Environmental Science & Engineering 2014年第5期8卷 784-791页

作者： Sanath KONDAVEETI kwang soon CHO Ramesh KAKARLA Booki MIN Department of Environmental Science and Engineering Kyung Hee University Gyeonggi-do 446-701 Republic of Korea

Renewable algae biomass, Scenedesmus obliquus, was used as substrate for generating electricity in two chamber microbial fuel cells （MFCs）. From polarization test, maximum power density with pretreated algal biomass was 102mW·m^2 （951mW·m^3） at current generation of 276mA·m^-2. The individual electrode potential as a function of current generation suggested that anodic oxidation process of algae substrate had limitation for high current generation in MFC. Total chemical oxygen demand （TCOD） reduction of 74% was obtained when initial TCOD concentration was 534mg · L^-1 for 150 h of operation. The main organic compounds of algae oriented biomass were lactate and acetate, which were mainly used for electricity generation. Other byproducts such as propionate and butyrate were formed at a negligible amount. Electrochemical Impedance Spectroscopy （EIS） analysis pinpointed the charge transfer resistance （112Ω ） of anode electrode, and the exchange current density of anode electrode was 1214 nA·cm^-2.

关键词： microbial fuel cell (MFC) algae bioelectricity substrate volatile fatty acid biomass COD removalefficiency

A THREE-PARAMETER FAULT-DETECTION SOFTWARE RELIABILITY MODEL WITH THE UNCERTAINTY OF OPERATING ENVIRONMENTS

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Journal of Systems Science and Systems Engineering 2017年第1期26卷 121-132页

作者： kwang Yoon song In Hong Chang Hoang Pham Department of Computer Science and Statistics Chosun University Gwangju 62022 Korea Department of Industrial and Systems Engineering Rutgers University NJ 08855-8018 USA

As requirements for system quality have increased, the need for high system reliability is also increasing. Soflnvare systems are extremely important, in terms of enhanced reliability and stability, for providing high quality services to customers. However, because of the complexity of software systems, soft-ware development can be time-consuming and expensive. Many statistical models have been developed in the past years to estimate soflnvare reliability. In this paper, we propose a new three-parameter fault-detection software reliability model with the uncertainty of operating environments. The explicit mean value function solution for the proposed model is presented. Examples are presented to illustrate the goodness-of-fit of the proposed model and several existing non-homogeneous Poisson process （NHPP） models based on three sets of failure data collected from software applications. The results show that the proposed model fits significantly better than other existing NHPP models based on three criteria such as mean squared error （MSE）, predictive ratio risk （PRR）, and predictive power （PP）.

关键词： Nonhomogeneous Poisson process ratio risk predictive power fault detection software reliability mean squared error predictive

Wave prediction in a port using a fully nonlinear Boussinesq wave model

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Acta Oceanologica Sinica 2019年第7期38卷 36-47页

作者： Young-kwang Choi Seung-Nam Seo Jin-Yong Choi Fengyan Shi kwang-soon Park Civil and Architectural Engineering Department KEPCO Engineering and ConstructionGimcheon-si 39660Republic of Korea Task Force for Construction of RV ISABU Support Facility Korea Institute of Ocean Science and TechnologyBusan Metropolitan City 49111Republic of Korea Operational Oceanography Research Center Korea Institute of Ocean Science and TechnologyBusan Metropolitan City 49111Republic of Korea Center for Applied Coastal Research University of DelawareNewark DE 19716USA

A wave forecasting system using FUNWAVE-TVD which is based on the fully nonlinear Boussinesq equations by Chen(2006)was developed to provide an accurate wave prediction in the Port of Busan,South *** system is linked to the Korea Operational Oceanographic System(KOOS)developed by Park et al.(2015).The computational domain covers a region of 9.6 km×7.0 km with a grid size of 2 m in both directions,which is sufficient to resolve short waves and dominant sea *** total number of grid points exceeds 16 millions,making the model computational *** provide real-time forecasting,an interpolation method,which is based on pre-calculated results of FUNWAVE-TVD and SWAN forecasting results at the FUNWAVE-TVD offshore boundary,was used.A total of 45 cases were pre-calculated,which took 71 days on 924 computational cores of a Linux cluster *** wave generation and propagation from the deep water were computed using the SWAN in *** results provided a boundary condition for the FUNWAVE-TVD forecasting *** verify the model,wave observations were conducted at three locations inside the port in a time period of more than 7 months.A model/model comparison between FUNWAVE-TVD and SWAN was also carried *** is found that,FUNWAVE-TVD improves the forecasting results significantly compared to SWAN which underestimates wave heights in sheltered areas due to incorrect physical mechanism of wave diffraction,as well as large wave heights caused by wave reflections inside the port.

关键词： real-time wave forecasting FUNWAVE-TVD SWAN KOOS wave observations wave diffraction

Structural identification of active moiety in anti-tumor metastatic polysaccharide purified from fermented barley by sequential enzymatic hydrolysis

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Food Bioscience 2022年第6期50卷 139-149页

作者： Seung-U Son Han Wool Kim kwang-soon Shin Department of Food Science and Biotechnology Kyonggi UniversitySuwon16227Republic of Korea Transdisciplinary Major in Learning Health System Department of Integrated Biomedical and Life ScienceKorea UniversitySeoul02841Republic of Korea

The potent anti-cancer metastatic effects induced by the immunostimulatory activities of intravenously administered BF–I,an active polysaccharide purified from fermented barley,were previously *** study aimed to evaluate the anti-cancer metastatic effect of orally administered BF–I and elucidated the microstructure and active moiety of BF–I using sequential enzymatic *** experiments using Colon26-M3.1 carcinoma,prophylactic oral administration of BF–I potently suppressed lung cancer ***,gas chromatography-mass spectrometry analysis of partially methylated alditol acetate showed that BF–I comprised 15 different glycosyl linkages,including 4-linked Xylp(16.1%),terminal Araf(12.4%),4-linked Glcp(32.8%),3-linked Glcp(13.5%),3,6-linked Glcp(1.5%),and 3,6-linked Galp(5.3%).These glycosyl linkage combinations are typical for arabinoxylan,yeast-derivedβ-glucan,barley-derivedβ-glucan,and type II *** clarify the microstructure,BF–I was sequentially degraded via linkage-specific enzymatic hydrolysis using five ***,the sugar composition,glycosyl linkage,and reactivity with theβ-glucosyl Yariv reagent were analyzed,along with sequencing based on tandem mass spectra of partially degraded fragment *** results confirmed that BF–I comprises a mixture of four different types of polysaccharides(arabinoxylan,yeast-derivedβ-glucan,barley-derivedβ-glucan,and type II arabinogalactan)with similar molecular ***,different polysaccharides contribute significantly to cytokine(interleukin-6,-12,and tumor necrosis factor-α)secretion by peritoneal ***,the potent anti-cancer metastatic activity of BF–I is proposed to be related to the immunostimulatory activities of the four different types of polysaccharides.

关键词： Barley Polysaccharide structure Anti-cancer Enzymatic hydrolysis

Broadcast-Based Spatial Queries

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Journal of Computer Science & Technology 2005年第6期20卷 811-821页

作者： kwang-Jin Park Moon-Bae song Chong-Sun Hwang Department of Computer Science and Engineering Korea University 5-1 Anam-Dong Seongbuk-Ku Seoul 136-701 Korea

Indexing techniques have been developed for wireless data broadcast environments, in order to conserve the scarce power resources of the mobile clients. However, the use of interleaved index segments in a broadcast cycle increases the average access latency for the clients. In this paper, the broadcast-based spatial query processing methods （BBS） are presented for the location-based services. In the BBS, broadcasted data objects are sorted sequentially based on their locations, and the server broadcasts the location dependent data along with an index segment. Then, a sequential prefetehing and caching scheme is designed to reduce the query response time. The performance of this scheme is investigated in relation to various environmental variables, such as the distributions of the data objects, the average speed of the clients and the size of the service area.

关键词： broadcasting location-aware caching prefetching mobile computing

LiTFSI salt concentration effect to digest lithium polysulﬁdes for high-loading sulfur electrodes

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Journal of Energy Chemistry 2023年第3期78卷 574-581,I0015页

作者： Jin-kwang song Moonsoo Kim Seongbae Park Young-Jun Kim SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan UniversitySuwon 16419Republic of Korea Department of Nano Engineering Sungkyunkwan UniversitySuwon 16419Republic of Korea

Sulfur utilization improvement and control of dissolved lithium polysulﬁde(LiPS;Li_(2)S x,2 详细信息

Sulfur utilization improvement and control of dissolved lithium polysulﬁde(LiPS;Li_(2)S x,2

关键词： Lithium-sulfur battery Electrolyte concentration Li2S deposition High-loading sulfur electrode

Distribution of electric field for carbon nanotube assembly: Simulation (I)

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Transactions of Nonferrous Metals Society of China 2011年第A01期21卷 117-120页

作者： soon-Geun KWON Soo-Hyun KIM kwang-Ho KIM Myung-Chang KANG Hyung-Woo LEE Department of Mechanical Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon 305-701 Korea National Core Research Center for Hybrid Materials Solution Pusan National University

The distribution of electric field for the alignment and attachment of carbon nanotubes (CNTs) was simulated. To be attached at the desired place, the aligned and attracted CNTs should be stayed in the desired area called the stable region or the quasi-stable region for an instant where the change of electric field is minimized. Since the conical electrode has the very narrow sized quasi-stable region, few CNTs can be attached. The rectangular electrodes have a wide stable region, so lots of CNTs can be attached. The results indicate that the round electrode which has a proper sized quasi-stable region is more effective for aligning and attaching a single CNT than the conical or rectangular shaped electrodes.

关键词： carbon nanotubes (CNTs) dielectrophoresis (DEP) round shaped electrode simulation