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Prediction of effluent concentration in a wastewater treatment plant using machine learning models

Journal of Environmental Sciences 2015年第6期27卷 90-101页

作者： Hong Guo Kwanho Jeong Jiyeon Lim Jeongwon Jo Young Mo Kim Jong-pyo Park Joon Ha Kim kyung hwa cho School of Environmental Science and Engineering Gwangju Institute of Science and Technology (GIST) School of Urban and Environmental Engineering Ulsan National Institute of Science and Technology HECOREA. INC

Of growing amount of food waste, the integrated food waste and waste water treatment was regarded as one of the efficient modeling method. However, the load of food waste to the conventional waste treatment process might lead to the high concentration of total nitrogen（T-N） impact on the effluent water quality. The objective of this study is to establish two machine learning models-artificial neural networks（ANNs） and support vector machines（SVMs）, in order to predict 1-day interval T-N concentration of effluent from a wastewater treatment plant in Ulsan, Korea. Daily water quality data and meteorological data were used and the performance of both models was evaluated in terms of the coefficient of determination（R^2）, Nash-Sutcliff efficiency（NSE）, relative efficiency criteria（d rel）. Additionally, Latin-Hypercube one-factor-at-a-time（LH-OAT） and a pattern search algorithm were applied to sensitivity analysis and model parameter optimization, respectively. Results showed that both models could be effectively applied to the 1-day interval prediction of T-N concentration of effluent. SVM model showed a higher prediction accuracy in the training stage and similar result in the validation ***, the sensitivity analysis demonstrated that the ANN model was a superior model for 1-day interval T-N concentration prediction in terms of the cause-and-effect relationship between T-N concentration and modeling input values to integrated food waste and waste water treatment. This study suggested the efficient and robust nonlinear time-series modeling method for an early prediction of the water quality of integrated food waste and waste water treatment process.

关键词： Artificial neural network Support vector machine Effluent concentration Prediction accuracy Sensitivity analysis

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Evaluation of the relationship between two different methods for enumeration fecal indicator bacteria: Colony-forming unit and most probable number

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Journal of Environmental Sciences 2010年第6期22卷 846-850页

作者： kyung hwa cho Dukki Han Yongeun Park Seung Won Lee Sung Min Cha Joo-Hyon Kang Joon Ha Kim Department of Environmental Science and Engineering Gwangju Institute of Science and Technology Deparment of Civil and Environmental Engineering Dongguk University-Seoul Sustainable Water Resource Technology Center Gwangju Institute of Science and Technology

Most probable number （MPN） and colony-forming unit （CFU） estimates of fecal indicator bacteria （FIB） concentration are common measures of water quality in aquatic environments. Thus, FIB intensively monitored in Yeongsan Watershed in an attempt to compare two different methods and to develop a statistical model to convert from CFU to MPN estimates or vice versa. As a result, the significant difference was found in the MPN and CFU estimates. The enumerated Escherichia coli concentrations in MPN are greater than those in CFU, except for the measurement in winter. Especially in fall, E. coli concentrations in MPN are one order of magnitude greater than that in CFU. Contrarily, enterococci bacteria in MPN are lower than those in CFU. However, in general, a strongly positive relationship are found between MPN and CFU estimates. Therefore, the statistical models were developed, and showed the reasonable converting FIB concentrations from CFU estimates to MPN estimates. We expect this study will provide preliminary information towards future research on whether different analysis methods may result in different water quality standard violation frequencies for the same water sample.

关键词： most probable number colony-forming unit fecal indicator bacteria Escherichia coli enterococci

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Transplantation of human adipose tissue-derived stem cells for repair of injured spiral ganglion neurons in deaf guinea pigs

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Neural Regeneration Research 2016年第6期11卷 994-1000页

作者： Sujeong Jang Hyong-Ho cho Song-Hee Kim kyung-hwa Lee Yong-Bum cho Jong-Seong Park Han-Seong Jeong Department of Physiology Chonnam National University Medical School Department of Otolaryngology Chonnam National University Medical School Department of Pathology Chonnam National University Medical School

Excessive noise, ototoxic drugs, infections, autoimmune diseases, and aging can cause loss of spiral ganglion neurons, leading to permanent sensorineural hearing loss in mammals. Stem cells have been confirmed to be able to differentiate into spiral ganglion neurons. Little has been reported on adipose tissue-derived stem cells（ADSCs） for repair of injured spiral ganglion neurons. In this study, we hypothesized that transplantation of neural induced-human ADSCs（NI-h ADSCs） can repair the injured spiral ganglion neurons in guinea pigs with neomycin-induced sensorineural hearing loss. NI-h ADSCs were induced with culture medium containing basic fibroblast growth factor and forskolin and then injected to the injured cochleae. Guinea pigs that received injection of Hanks＇ balanced salt solution into the cochleae were used as controls. Hematoxylin-eosin staining showed that at 8 weeks after cell transplantation, the number of surviving spiral ganglion neurons in the cell transplantation group was significantly increased than that in the control group. Also at 8 weeks after cell transplantation, immunohistochemical staining showed that a greater number of NI-h ADSCs in the spiral ganglions were detected in the cell transplantation group than in the control group, and these NI-h ADSCs expressed neuronal markers neurofilament protein and microtubule-associated protein 2. Within 8 weeks after cell transplantation, the guinea pigs in the cell transplantation group had a gradually decreased auditory brainstem response threshold, while those in the control group had almost no response to 80 d B of clicks or pure tone burst. These findings suggest that a large amount of NI-h ADSCs migrated to the spiral ganglions, survived for a period of time, repaired the injured spiral ganglion cells, and thereby contributed to the recovery of sensorineural hearing loss in guinea pigs.

关键词： guinea ganglion repair hearing adipose injured brainstem auditory neuronal cochlear

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Efective Object Identification and Association by Varying Coverage Through RFID Power Control

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Journal of Computer Science & Technology 2014年第1期29卷 4-20页

作者： Shung Han cho kyung Hoon Kim Sangjin Hong IEEE System LSI Business Samsung Electronics Department of Electrical and Computer Engineering Stony Brook University

This paper presents an effective power scheduling strategy for energy efficient multiple objects identification and association. The proposed method can be utilized in many heterogeneous surveillance systems with visual sensors and RFID （radio-frequency identification） readers where energy efficiency as well as association rate are critical Multiple objects positions and trajectory estimates are used to decide the power level of RFID readers. Several key parameters including the time windows and the distance separations are defined in the method in order to minimize the effects of RFID coverage uncertainty. The power cost model is defined and incorporated into the method to minimize energy consumption and to maximize association performance. The proposed method computes the power cost using the range of the outermost position for possible single association and group associations at every sampling time. An RFID reader is activated with the proper coverage range when the power cost for the current time is lower than the power cost for the next time sample. The simplicity of the power cost model relieves the problematic combinatorial comparisons in multiple object cases. The performance comparison simulation with the minimum and maximum energy consumption shows that the proposed method achieves fast single associations with less energy consumption. Finally, the realistic comparison simulation with the fixed range RFID readers demonstrates that the proposed method outperforms the fixed ranges in terms of single association rate and energy consumption.

关键词： object association RFID power control power scheduling visual sensor collaboration

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Near-infrared laser irradiation of a multilayer agar-gel tissue phantom to induce thermal effect of traditional moxibustion

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Journal of Innovative Optical Health Sciences 2018年第6期11卷 21-32页

作者： Jiyong cho Bibin Prasad Jung kyung Kim Department of Mechanical Engineering Graduate School Kookmin UniversitySeoul 02707Republic of Korea Department of Radiation Oncology SMG-Seoul National University Boramae Medical Center Seoul 07061 Republic of Korea School of Mechanical Engineering and Department of Integrative Biomedical Science and Engineering Graduate School Kookmin University Seoul 02707Republic of Korea

Traditional moxibustion therapy can stimulate heat and blood-vessel expansion and advance blood *** the present study,a novel noncontact-type thermal therapeutic system was developed using a near-infrared laser *** device allows direct interaction of infrared laser light with the skin,thereby facilitating a controlled temperature distribution on the skin and the deep tissues below the *** using a tissue-mimicking phantom as a substitute for real skin,the most important optical and thermal parameters are the absorption/attenuation coefficient,thermal conductivity,and specic *** found that these parameters can be manipulated by varying the agar-gel ***,a multilayer tissue-mimicking phantom was fabricated using different agar-gel *** imaging and thermocouples were used to measure the temperature distribution inside the phantom during laser *** temperature increased with the increase in the agar-gel concentration and reached a maximum value under the tissue phantom *** induce a similar thermal effect of moxibustion therapy,controlled laser-irradiation parameters such as output power,wavelength and pulse width were obtained from further analysis of the temperature *** the known optothermal properties of the patient's skin,the temperature distribution inside the tissue was manipulated by optimizing the laser *** study can contribute to patient-specic thermal therapy in clinics.

关键词： Laser–tissue interaction tissue phantom moxibustion hyperthermia bioheat transfer

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Stability of neodymium:YAG laser posterior capsulotomy in eyes with capsular tension rings

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International Journal of Ophthalmology(English edition) 2023年第6期16卷 891-896页

作者： Yang kyung cho Min Sun Kim Department of Ophthalmology St.Vincent’s HospitalCollege of MedicineThe Catholic University of KoreaSeoul 06591Republic of Korea

·AIM: To evaluate the stability of neodymium(Nd):YAG laser posterior capsulotomy in eyes with capsular tension rings(CTRs).·METHODS: A total of 60 eyes that underwent cataract surgery and laser posterior capsulotomy postoperatively were included in this retrospective cohort study. To evaluate the safety and stability of capsulotomy, changes in the size of posterior capsulotomy and anterior chamber depth(ACD) in three groups: the group without CTR, the group with 12 mm CTRs, and the group with 13 mm CTRs, at 1wk, 3, 12, and 15mo after capsulotomy, were compared. ·RESULTS: In the group without CTR and the group with 12 mm CTR, there was no significant change in ACD at every post-laser follow-up. In the group with 13 mm CTR, the ACD change was significant until 3mo after capsulotomy. In all groups, there was a significant increase in the area of capsulotomy between 1wk and 3mo post-laser. Between 3 and 12mo post-laser, only the group with 13 mm CTR showed a significant increase in the area of capsulotomy(P<0.01). ·CONCLUSION: Laser posterior capsulotomy is safe in all three groups. The capsulotomy and ACD become stabilized and have not shown significant changes since 1y postlaser, even with larger CTRs. The maintenance of centrifugal capsular tension can last longer with larger CTRs, and the stability of the capsulotomy site can be reached about 12mo after capsulotomy in pseudophakic eyes with larger CTRs.

关键词： Nd:YAG laser capsulotomy capsular tension ring

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Antifi brotic effects of green tea on in vitro and in vivo models of liver fibrosis

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World Journal of Gastroenterology 2009年第41期15卷 5200-5205页

作者： Hye kyung Kim Taik-Hoon Yang Hong-Yon cho Department of Food and Biotechnology Hanseo University Seosan Chungnam 356-706 South Korea Department of Food and Bio-technology College of Science and Technology Korea University Jochiwon Chungnam 339-700 South Korea

AIM: To examine the protective effect of green tea extract (GT) on hepatic fi brosis in vitro and in vivo in dimethylnitrosamine (DMN)-induced ***: HSC-T6, a rat hepatic stellate cell line, was used as an in vitro assay system. Cell proliferation, collagen content, and type 1 collagen expression were examined in activated HSC-T6 cells. Collagen was determined by estimating the hydroxyproline content. In rats with DMN-induced hepatic fi brosis, serum aspartate aminotransferase and alanine aminotransferase concentrations, liver hydroxyproline and lipid peroxides were determined. Pathologic changes were examined by hematoxylin & eosin ***: GT administration prevented the development of hepatic fibrosis in the rat model of DMN-induced liver fi brosis. These results were confi rmed both by liver histology and by quantitative measurement of hepatic hydroxyproline content, a marker of liver collagen deposition. Accordingly, inhibition of proliferation, reduced collagen deposition, and type 1 collagen expression were observed in activated HSC-T6 cells following GT treatment. These results imply that GT reduced the proliferation of activated HSC and down regulated the collagen content and expression of collagen type 1, thereby ameliorating hepatic ***: This study demonstrates that greentea administration can effectively improve liver fibrosis caused by DMN, and may be used as a therapeutic option and preventive measure against hepatic f ibrosis.

关键词： Dimethylnitrosamine Green tea extract HSC-T6 cell Liver fibrosis Rat model Type 1 collagen

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Intermittent, low-dose, antiandrogen monotherapy as an alternative therapeutic option for patients with positive surgical margins after radical prostatectomy

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Asian Journal of Andrology 2018年第3期20卷 270-275页

作者： kyung hwa choi Seung Ryeol Lee Young Kwon Hong Dong Soo Park Department Urology CHA Bundang Medical Center CHA University Seongnam Korea.

The aim of the present study was to determine whether oncologic outcomes and adverse events associated with active on/off intermittent antiandrogen monotherapy （daily bicalutamide, 50 mg per day） are comparable with those of standard external beam radiation therapy （EBRT） or combined androgen blockade （CAB） therapy in prostate cancers with positive surgical margins after radical prostatectomy. Two hundred twenty-three patients with positive surgical margins post-radical prostatectomy who underwent active surveillance （AS, n = 32）, EBRT without hormone therapy （n = 55）, intermittent antiandrogen monotherapy without EBRT （IAAM, n= 50）, or CAB without EBRT （n = 86）, between 2007 and 2014, were reviewed retrospectively. Pathologic outcomes, biochemical recurrence rates, radiological disease progression, and adverse events were collected from medical records. Biochemical recurrence rates, biochemical recurrence-free survival rates, and radiological recurrence were not different between the groups （P = 0.225, 0.896, and 0.284, respectively）. Adverse event rates and severities were lower for IAAM compared with EBRT or CAB （both P 〈 0.05）, but were comparable to those for AS （P = 0.591 and 0.990, respectively）. Grade ：〉3 adverse events were not reported in the IAAM or AS groups. Erectile dysfunction and loss of libido rates were lower in the IAAM group compared with the EBRT and CAB groups （P = 0.032）. Gastrointestinal complications were more frequently reported in the EBRT group （P = 0.008）. Active on/off IAAM treatment might be an appropriate treatment option for patients with positive surgical margins after radical prostatectomy. Furthermore, regarding oncologic outcomes, IAAM was comparable to standard EBRT but had a milder adverse event profile.

关键词： androgen receptor antagonists disease progression margins of excision prostatectomy prostatic neoplasms

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Efficacy of haptic sutured in-the-bag intraocular lens for intraocular lens-capsule complex stability:a comparison of three insertion methods

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International Journal of Ophthalmology(English edition) 2022年第9期15卷 1468-1475页

作者： Yang kyung cho Andrew Thomson Balamurali K Ambati Department of Ophthalmology College of MedicineThe Catholic University of KoreaSeoul 06591Republic of Korea Pacific Clear Vision Institute EugeneOregon 97403-1299USA University of Oregon EugeneOregon 97403-1299USA

·AIM:To evaluate the efficacy and stability of haptic sutured in-the-bag intraocular lens(IOL)in eyes with zonular instability.·METHODS:A total 60 eyes of 60 patients were included in this retrospective cohort *** stability in three groups[haptic sutured IOL in the bag,IOL in the bag insertion with haptics oriented toward areas of zonulysis,IOL with capsular tension ring(CTR)in the bag insertion]were compared according to the IOL insertion *** evaluate the IOL stability,the changes of anterior chamber depth(ACD),refraction,contraction of anterior continuous curvilinear capsulotomy(CCC)area,and tilt of IOL were compared.·RESULTS:There was no significant difference in change of ACD(-0.04±0.01 mm in group of haptic sutured IOL,-0.07±0.01 mm in group of CTR insertion)and refraction(0.05±0.05 D in group of haptic sutured IOL,0.37±015 D in group of CTR insertion)between the group of haptic sutured IOL in the bag and CTR insertion *** in comparison of CCC contraction and IOL tilt,CTR insertion group showed less contraction(1.00%±0.52%)and less IOL tilt(2.66°±0.11°)than the group of haptic sutured IOL in the bag(6.32%±1.36%,3.47°±0.11°,respectively).The CTR insertion group showed the least CCC contraction and the least tilt.·CONCLUSION:In eyes with zonular instability,the method of haptic sutured IOL in-the-bag shows comparable stability in ACD and refraction in comparison with IOL with CTR in the bag *** method of IOL only in-thebag insertion shows the largest contraction of CCC and the largest tilt of IOL.

关键词： zonular instability capsular tension ring haptic sutured in the bag

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Self‑Powered Airflow Sensor Based on Energy Harvesting of Ventilation Air in Buildings

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Advanced Fiber Materials 2023年第5期5卷 1788-1798页

作者： Moon Hyun Chung Seunghwan Yoo Woo‑Nam Jung Hakgeun Jeong kyung‑hwa Yoo Department of Physics Yonsei University50 Yonsei‑RoSeodaemun‑GuSeoul 03722Republic of Korea Energy ICT Convergence Research Department Energy Efficiency Research DivisionKorea Institute of Energy Research152 Gajeong‑RoYuseong‑GuDaejeon 34129Republic of Korea Advanced Combustion Power Lab Energy Efficiency Research DivisionKorea Institute of Energy Research152Gajeong‑RoYuseong‑GuDaejeon 34129Republic of Korea Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak‑RoYuseongDaejeon 34141Republic of Korea

Heating,ventilation,and air conditioning(HVAC)systems account for one-third of the total energy consumption in office *** use of airflow measurements to control the operation of HVAC systems can reduce energy consumption;thus,a sensor capable of monitoring airflow in a duct system is *** nanogenerators(TENGs)can be utilized as self-powered sensors in airflow-driven TENGs(ATENGs)as self-powered *** employing ferroelectric materials and surface modifications,the surface charges of TENGs can be *** this study,fibrous-mat TENGs were prepared using ferroelectric materials consisting of poly(vinylidene fluoride-co-trifluoroethylene)(PVDF-TrFE)and polyamide 11(nylon-11).And these materials were subsequently ***(3,4-ethylenedioxythiophene):poly(styrenesulfonate)was added to PVDF-TrFE to enhance the ferroelectric crystalline phase.X-ray diffraction analysis revealed that this incorporation affects theβ*** addition,the surface of nylon-11 was modified using the electrospray technique for post-treatment,thereby improving the interfacial adhesion between the *** materials were then utilized in fibrous-mat ATENGs(FM-ATENGs)to demonstrate their practical *** FM-ATENGs can be effectively used in an Arduino airflowcheck sensor,showcasing their potential for application in HVAC systems,to enhance airflow control and energy efficiency.

关键词： HVAC Airflow-driven triboelectric nanogenerator Building energy harvesting Fibrous mat Airflow sensor

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