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Evaluation of the k-nearest neighbor method for forecasting the influent characteristics of wastewater treatment plant

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Frontiers of Environmental Science & Engineering 2016年第2期10卷 299-310页

作者： minsoo kim Yejin kim Hyosoo kim Wenhua PIAO Changwon kim Department of Civil and Environmental Engineering Pusan National University Busan 609-735 Republic of Korea Department of Civil and Environmental Engineering Catholic University of Pusan Busan 609-757 Republic of Korea EnvironSoft Co. Ltd. #511 Industry-University Co.Bld. Pusan Nationai University Busan 609-735 Republic of Korea

The k-nearest neighbor （k-NN） method was evaluated to predict the influent flow rate and four water qualities, namely chemical oxygen demand （COD）, suspended solid （SS）, total nitrogen （T-N） and total phosphorus （T-P） at a wastewater treatment plant （WWTP）. The search range and approach for determining the number of nearest neighbors （NNs） under dry and wet weather conditions were initially optimized based on the root mean square error （RMSE）. The optimum search range for considering data size was one year. The square root-based （SR） approach was superior to the distance factor-based （DF） approach in determining the appropriate number of NNs. However, the results for both approaches varied slightly depending on the water quality and the weather conditions. The influent flow rate was accurately predicted within one standard deviation of measured values. Influent water qualities were well predicted with the mean absolute percentage error （MAPE） under both wet and dry weather conditions. For the seven-day prediction, the difference in predictive accuracy was less than 5% in dry weather conditions and slightly worse in wet weather conditions. Overall, the k-NN method was verified to be useful for predicting WWTP influent characteristics.

关键词： influent wastewater prediction data-drivenmodel k-nearest neighbor method (k-NN)

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基于模糊神经网（FNN）的总氮软测量方法

基于模糊神经网（FNN）的总氮软测量方法

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作者：金珉秀（kim minsoo）北京工业大学

学位级别：硕士

总氮检测作为城市污水处理的重要内容,是保证总氮去除、监督污水出水总氮含量的必要步骤。目前,我国大部分污水处理厂总氮检测主要依靠人工化验得到。测量和分析的频率为每周1-2次,很难依靠总氮的测量实时采取总氮的控制策略,进而导致... 详细信息

总氮检测作为城市污水处理的重要内容,是保证总氮去除、监督污水出水总氮含量的必要步骤。目前,我国大部分污水处理厂总氮检测主要依靠人工化验得到。测量和分析的频率为每周1-2次,很难依靠总氮的测量实时采取总氮的控制策略,进而导致出水总氮的监控严重不足,整体去除率不高,影响了污水处理厂运行效益,增加了对环境危害的风险。由于总氮受环境和其他污水过程因素的影响较大,出水总氮的含量也表现明显的波动,实现实时在线的总氮检测具有很大难度,现有的分析方法和仪表不能实时测量总氮浓度。因此,本论文提出了利用基于模糊神经网(FNN)的总氮软测量方法,预测总氮的浓度,具体如下:首先,设计了基于径向基函数神经网络(RBFNN)的模糊神经网络模型。其次,利用最小二乘法(Partial Least Squares,PLS)来选择与总氮相关性强的变量。然后,以所选变量为输入值对FNN模型进行训练。最后,在实际实验的基础上对模型进行了评价。同时,由于连接权值只存在于隐藏层和输出层之间,因此RBFNN难以表示非线性系统的输出。为了解决这一问题,提出的FNN模式将连接权值的种类扩展至多航式。另外,为了方便快捷地设计神经网的分段函数,还使用了模糊C均值(Fuzzy C-mean,FCM)聚类算法。实验结果表明,基于RBFNN的软测量方法可以快速测量总氮浓度。

关键词：模糊神经网络总氮软计算方法径向基函数神经网络模糊C均值聚类

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Role of small leucine zipper protein in hepatic gluconeogenesis and metabolic disorder

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Journal of Molecular Cell Biology 2021年第5期13卷 361-373页

作者： minsoo Kang Sun Kyoung Han Suhyun kim Sungyeon Park Yerin Jo Hyeryung Kang Jesang Ko Division of Life Sciences Korea UniversitySeoul 02841South Korea

Hepatic gluconeogenesis is the central pathway for glucose generation in the *** imbalance between glucose synthesis and uptake leads to metabolic diseases such as obesity,diabetes,and cardiovascular *** leucine zipper protein(sLZIP)is an isoform of LZIP and it mainly functions as a transcription *** sLZIP is known to regulate the transcription of genes involved in various cellular processes,the role of sLZIP in hepatic glucose metabolism is not *** this study,we investigated the regulatory role of sLZIP in hepatic gluconeogenesis and its involvement in metabolic *** found that sLZIP expression was elevated during glucose starvation,leading to the promotion of phosphoenolpyruvate carboxylase and glucose-6-phosphatase expression in ***,sLZIP knockdown suppressed the expression of the gluconeogenic enzymes under low glucose *** also enhanced glucose production in the human liver cells and mouse primary hepatic ***-induced cyclic adenosine monophosphate impeded sLZIP *** of glucose and pyruvate tolerance tests showed that sLZIP transgenic mice exhibited abnormal blood glucose *** findings suggest that sLZIP is a novel regulator of gluconeogenic enzyme expression and plays a role in blood glucose homeostasis during starvation.

关键词： gluconeogenic enzymes hepatic gluconeogenesis hyperglycemia transcription factor

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Longitudinal trajectories of physical activity in women using latent class growth analysis:The WIN Study

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Journal of Sport and Health Science 2016年第4期5卷 410-416页

作者： Youngdeok kim minsoo Kang Anna M.Tacón James R.Morrow Jr Department of Kinesiology and Sport Management Texas Tech University Department of Health and Human Performance Middle Tennessee State University Department of Kinesiology Health Promotionand RecreationUniversity of North Texas

Purpose：This study aimed（1） to examine the longitudinal trajectories in objectively measured physical activity（PA）;（2） to identify unknown（i.e.,latent） subgroups with distinct trajectories;and（3） to examine the correlates of latent subgroups among community dwelling ***：The study sample included a total of 669 women from the Women＇s Injury Study,a 5-year prospective cohort study conducted from2007 in the Southwest Central region of the ***-based step-count data across 18 consecutive months were fitte to a latent growth model（LGM） and a latent class growth model（LCGM）.Baseline characteristics were regressed on latent class ***：The longitudinal change in PA was best fi to a piecewise LGM with seasonal *** y increased and decreased levels of PA were observed during the spring,fall,and winter,respectively（p〈0.001）.Three latent subgroups with distinct PA trajectories were identifie（low-active（46.8%）,somewhat-active（41.3%）,and active（11.9%））.Age and body fat percentage at the baseline significant y explained the likelihoods of being in low-active ***：Seasonal variations in PA among women were observed but may not be practically significant A relatively large portion of the sample showed low levels of PA for long *** strategies should be considered for women who are overweight or obese,and aged 〉40 years old to promote PA during the life course.

关键词： Female Pedometer Prospective cohort Season Step-count

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A Study on the Pressure Values of Contrast Media Injecting for the Prevention of Extravasations used Extravasation Detector

A Study on the Pressure Values of Contrast Media Injecting f...

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2010中华医学会影像技术分会第十八次全国学术大会

作者： Youha Hwang minsoo Lee Seungho Ock Heejin Hwang Jongjin Ahn Ohsung Kwon Hyeong cheol kim Chunkyu Choi Department of Radiology Seoul National University HospitalSeoulKorea

Objective:Extravasation of contrast media has been seriously managed for the patients’safety and various studies are currently being performed on ***,it is very difficult to prevent the extravasations which caused by...

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