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Factors affecting flocculation performance of synthetic polymer for turbidity control

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Journal of Agricultural Chemistry and Environment 2013年第1期2卷 16-21页

作者： Minyoung kim Seounghee kim Jinoh kim Sukwon Kang Sangbong Lee Department of Agricultural Engineering National Academy of Agricultural Science Rural Development Administration (RDA) Suwon Republic of Korea

A multilateral effort into managing nonpoint source pollution from agriculture has gotten much attention for many years. Particularly during the heavy rain season, run-off of turbid water from sloped farmlands, fallow ground and/or unmanaged uplands is deteriorated. Flocculant polymer, commonly used in wastewater treatment facilities, but now exploited to improve control of sediment turbidity by promoting flocculation of particles in construction site. This study used the flocculant polymer to control the discharge of agricultural nonpoint source pollution and focused on the understanding of how soil-water and polymer properties affect flocculation performance. Therefore, a series of flocculation experiments under different conditions was evaluated for better polymer clarification efficiency. Various factors such as flocculant dose, end-over-end inversion of a cylinder, and soil-water properties (pH, NaCl, organic matter) were studied. The effective flocculant dose that fulfilled fast settling rate was 10mg·L-1. Additional findings included that 1) increasing pH decreased the settling rate of soil particle;2) a positive relationship between the percentage of turbidity reduction and a level of salinity in Kaolin suspension was observed, and 3) organic matter in soil solution inhibited PAM adsorption onto soil particles, which caused the reduction of flocculation performance. The findings of this study revealed that flocculant polymer possess good results as a turbidity reducetion measure and couldfurther provide valuable information to make better decision on establishment of Best Management Practice for handling agricultural nonpoint source pollution.

关键词： Agricultural Nonpoint Source Pollution Flocculation Synthetic Polymer Turbidity Control Soil-Water Properties

Synthesis and Electrical Properties of TiO_2 Nanoparticles Embedded in Polyamide-6 Nanofibers Via Electrospinning

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Nano-Micro Letters 2011年第1期3卷 56-61页

作者： R.Nirmala Jin Won Jeong R.Navamathavan Hak Yong kim Bio-nano System Engineering Chonbuk National University Department of Organic Materials and Fiber Engineering Chonbuk National University Center for Healthcare Technology & Development Chonbuk National University School of Advanced Materials Engineering Chonbuk National University

We report on the synthesis and characterizations of TiO2 nanoparticles embedded in polyamide-6composite nanofibers by using electrospinning technique. The influence of substrate on the electrical characteristics of polyamide-6/TiO2 composite nanofibers was investigated. The resultant nanofibers exhibit good incorporation of TiO2 nanoparticles. The doping of TiO2 nanoparticles into the polyamide-6 nanofibers were confirmed by high resolution transmission electron microscopy and energy dispersive X-ray spectroscopy. Photoluminescence（PL） and cathodoluminescence（CL） spectroscopy were also used to characterize the *** PL and CL spectra reveal that the as-spun polyamide-6/TiO2 composite nanofibers consisted of overlapping of two broad emission bands due to the contribution of polyamide-6（centered at about 475 nm）, which might originate from organic functional groups of polyamide-6 and TiO2 nanoparticles（centered around 550 nm）. The electrical conductivity of the polyamide-6/TiO2 composite nanofibers on different substrates was carried *** was found that the electrical conductivity of the polyamide-6/TiO2 composite nanofibers on silicon substrate was in the range of 13 μA, and about 1 to 20 p A for the paper and glass substrates.

关键词： Electrospinning Polyamide-6 Nanoparticles Nanofibers Electrical studies

Inverse design of a Si-based high-performance vertical-emitting meta-grating coupler on a220 nm silicon-on-insulator platform

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Photonics Research 2023年第6期11卷 897-905页

作者： JINHYEONG YOON JAE-YONG kim JUNHYEONG kim HYEONHO YOON BERKAY NESELI HYO-HOON PARK HAMZA KURT School of Electrical Engineering Korea Advanced Institute of Science and Technology(KAIST)DaejeonRepublic of Korea

Efficient extraction of light from a high refractive index silicon waveguide out of a chip is difficult to *** inverse design approach was employed using the particle swarm optimization method to attain a vertical emitting meta-grating coupler with high coupling efficiency in a 220-nm-thick silicon-on-insulator *** carefully selecting the figure of merit and appropriately defining parameter space,unique L-shape and U-shape grating elements that boosted the out-of-plane radiation of light were *** addition,a 65.7%(-1.82 dB)outcoupling efficiency and a 60.2%(-2.2 dB)fiber-to-chip vertical coupling efficiency with an 88 nm 3 dB bandwidth were demonstrated by numerical *** fabrication constraints,the optimized complex meta-grating coupler was modified to correspond to two etching steps and was then fabricated with a complementary metal-oxide-semiconductor-compatible *** modified meta-grating coupler exhibited a simulated coupling efficiency of 57.5%(-2.4 d B)with a 74 nm 3-dB bandwidth in the C-band and an experimentally measured coupling efficiency of 38%(-4.2 dB).

关键词： waveguide coupling insulator

Effectiveness of out-fracture of the inferior turbinate with reduction nasal bone fracture

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世界临床病例杂志 2023年第27期11卷 6374-6382页

作者： Se-Young kim Ha-Jong Nam Je-Yeon Byeon Hwan Jun Choi Department of Plastic and Reconstructive Surgery Soonchunhyang University Gumi HospitalGumi-si 39371South Korea Department of Plastic and Reconstructive Surgery Soonchunhyang University Cheonan HospitalCheonan-si 31151South Korea

BACKGROUND The nasal bone,being the most protruding bone in the center of the facial bones,is particularly susceptible to *** bone fractures can often result in secondary deformation and dysfunction of the nose,including septal *** on functional or intra-nasal complications have been rarely reported after nasal bone fracture *** To evaluate the severity of nasal obstruction and its improvement following nasal bone fracture reduction using inferior *** We conducted a retrospective review of data from 50 patients with symptomatic nasal obstruction between January to December *** patients underwent preoperative Computed tomography evaluation,and symptom changes and nasal cavity volume were analyzed using a visual analog scale and acoustic rhinometry before and after *** reduction and out-fracture of both inferior turbinates performed by the same *** outcomes were assessed by comparing changes in the nasal airway volume measured using acoustic rhinometry before and after *** minimal cross-sectional area(MCA)was also analyzed based on the Stranc *** Before reduction,the mean MCA for all cases was 0.59±0.06 cm^(2),which represented an 11%decrease compared to the average size of a Korean adult(0.65±0.03 cm^(2)).The MCA for frontal impact was 0.60±0.02 cm^(2) and for lateral impact,it was 0.58±0.03 cm^(2).After reduction via inferior turbinoplasty,the MCA improved to 0.64±0.04 cm^(2).CONCLUSION This study suggests that turbinoplasty is helpful in addressing nasal ***-fracture of the inferior turbinate is an effective and durable technique that can be easily performed to enlarge the nasal airway with minimal morbidity.

关键词： Acoustic rhinometry Nasal bone Fracture Turbinate

Classification of 3D Film Patterns with Deep Learning

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Journal of Computer and Communications 2019年第12期7卷 158-165页

作者： John Mlyahilu Youngbong kim Jongnam kim Department of IT Convergence and Application Engineering Pukyong National University Busan Korea

Researches on pattern recognition have been tremendously performed in various fields because of its wide use in both machines and human beings. Previously, traditional methods used to study pattern recognition problems were not strong enough to recognize patterns accurately as compared to optimization algorithms. In this study, we employ both traditional based methods to detect the edges of each pattern in an image and apply convolutional neural networks to classify the right and wrong pattern of the cropped part of an image from the raw image. The results indicate that edge detection methods were not able to detect clearly the patterns due to low quality of the raw image while CNN was able to classify the patterns at an accuracy of 84% within 1.5 s for 10 epochs.

关键词： Patterns Recognition Accuracy CNN Edge Detection Classifications

Visible light communication based on space-division multiple access optical beamforming

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Chinese Optics Letters 2014年第12期12卷 9-12页

作者： Sung-Man kim Hyun-Jun Lee Department of Electronic Engineering Kyungsung UniversityBusan 608-736South Korea

We propose and demonstrate a visible light communication （VLC） scheme based on space-division multiple access （SDMA） optical beamforming to accommodate multiple user devices in the VLC based on optical beamforming. SDMA optical bealnforming is a technique which separates light-emitting diode light spa- tially and focuses each part on different target devices simultaneously. We show the experimental results of the VLC signal amplitudes, the optical power densities, and the bit-error rate performance as a function of transmission distance before and after the SDMA optical beamforming. The results show that the VLC signal amplitudes and optical power densities are improved by 8-2 and 3.8- 5 dB, respectively, with the help of SDMA optical beamforming.

关键词： VLC SDMA Visible light communication based on space-division multiple access optical beamforming

Study on Stack Effect of Stairwell by Numerical Model of Leakage Flow through Gap of Door

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Open Journal of Fluid Dynamics 2013年第4期3卷 241-247页

作者： Jung-Yup kim Ji-Seok kim Fire Research Center Korea Institute of Construction Technology Goyang-Si South Korea

Since stack effect that occurs in high-rise buildings has an effect on the indoor environment of the buildings, energy loss and smoke control in case of a fire, there is a need to conduct research on this. For an analysis of the stack effect, analysis methods on the leakage flow through gap of interior door shall be formulated. Until now, studies related to the gap leakage flow in buildings have mainly analyzed flow field and pressure in the buildings one-dimensionally using pressure difference-leakage flowrate relations of Orifice Equation and a network numerical analysis algorithm that as- sumes each compartment in the buildings as a single point. In this study, the Momentum Loss Model which enables pressure drop to be proportional to the flow velocity through the gap of door in computational domain of 3-dimensional numerical analysis was proposed to reflect the gap flow phenomenon effectively in 3-dimensional numerical analysis. Using the proposed model, 3-dimensional numerical analysis of the stack effect on the stairs in buildings was performed, and the effects of separation door and lobby between stair and accommodation on the stack effect were investigated.

关键词： Stack Effect Leakage Flow Gap of Door Momentum Loss Model Separation Door Numerical Analysis

When should we perform colonoscopy to increase the adenoma detection rate?

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World Journal of Gastrointestinal Endoscopy 2021年第12期13卷 619-627页

作者： Sang Hoon kim Jae Hak kim Department of Internal Medicine Dongguk University Ilsan HospitalGoyang 10326South Korea

The rate of adenoma detection is the most reliable quality indicator of *** have reported that colonoscopy performed in morning has a higher adenoma detection rate(ADR)than that performed in the *** studies have explained that several physician-related factors such as undergoing an emergency procedure the night before colonoscopy,accumulated workload,and increased fatigue level in the afternoon might have led to such ***,several opposing articles have indicated that the time of day and ADR is not quite *** confounding factors can impact study *** withdrawal time and bowel preparation quality are key ***,queue list numbers,participation of academic fellows,nurses'assistance,and the number of colonoscopies allocated per hour are also notable ***,an attempt has been made to homogenize the ADR in the morning and afternoon through artificial intelligence-assisted *** review article introduces the history of this long-debated topic,discusses points to consider in real-world practice,and suggests new ideas for planning future *** understanding this issue,the rate of adenoma detection during colonoscopy is expected to be improved further.

关键词： Colonoscopy Colorectal cancer Time of endoscopy Afternoon colonoscopy Adenoma detection rate

Coarse and fine-tuning of lasing transverse electromagnetic modes in coupled all-inorganic perovskite quantum dots

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Nano Research 2021年第1期14卷 108-113页

作者： Youngsin Park Guanhua Ying Atanu Jana Vitaly Osokin Claudius C.Kocher Tristan Farrow Robert A.Taylor Kwang S.kim School of Natural Science Ulsan National Institute of Science and TechnologhUlsan 44919Republic of Korea Clarendon Laboratory Department of PhysicsUniversity of OxfordParks RoadOxford OX13PUUK Centre for Quantum Technologies National University of SingaporeScience Drive 2Singapore 117543Singapore

Inorganic perovskite lasers are of particular interest,with much recent work focusing on Fabry-P6rot cavity-forming *** demonstrate the direct observation of lasing from transverse electromagnetic(TEM)modes with a long coherence time-9.5ps in coupled CsPbBr_(3) quantum dots,which dispense with an external cavity resonator and show how the wavelength of the modes can be controlled via two independent *** the pump power allowed us tofine-tune the TEM mode structure to the emission wavelength,thus providing a degree of control over the properties of the lasing *** temperature-tuning provided an additional degree of control over the wavelength of the lasing peak,importantly,maintained a constant full width at half maximum(FWHM)over the entire tuning range without mode-hopping.

关键词： perovskite quantum dots coherent lasing transverse electromagnetic mode stimulated emission