scholarly journals Urban Crowd Detection Using SOM, DBSCAN and LBSN Data Entropy: A Twitter Experiment in New York and Madrid

Electronics ◽  
2019 ◽  
Vol 8 (6) ◽  
pp. 692
Author(s):  
Mohamed Sakkari ◽  
Abeer D. Algarni ◽  
Mourad Zaied
Keyword(s):  
New York ◽  
Social Network ◽  
Reference Model ◽  
Learning Algorithm ◽  
Detection System ◽  
Time Of Day ◽  
Time Interval ◽  
Entropy Model ◽  
The City ◽  
Abnormal Events

The surfer and the physical location are two important concepts associated with each other in the social network-based localization service. This work consists of studying urban behavior based on location-based social networks (LBSN) data; we focus especially on the detection of abnormal events. The proposed crowd detection system uses the geolocated social network provided by the Twitter application programming interface (API) to automatically detect the abnormal events. The methodology we propose consists of using an unsupervised competitive learning algorithm (self-organizing map (SOM)) and a density-based clustering method (density-based spatial clustering of applications with noise (DBCSAN)) to identify and detect crowds. The second stage is to build the entropy model to determine whether the detected crowds fit into the daily pattern with reference to a spatio-temporal entropy model, or whether they should be considered as evidence that something unusual occurs in the city because of their number, size, location and time of day. To detect an abnormal event in the city, it is sufficient to determine the real entropy model and to compare it with the reference model. For the normal day, the reference model is constructed offline for each time interval. The obtained results confirm the effectiveness of our method used in the first stage (SOM and DBSCAN stage) to detect and identify clusters dynamically, and imitating human activity. These findings also clearly confirm the detection of special days in New York City (NYC), which proves the performance of our proposed model.

169 BEHAVIORAL ASPECTS OF ESTRUS IN THE COMMON ELAND ANTELOPE, TAUROTRAGUS ORYX

2009 ◽  
Vol 21 (1) ◽  
pp. 183
Author(s):  
G. Wirtu ◽  
P. M. Pennington ◽  
C. E. Pope ◽  
R. A. MacLean ◽  
J. Mercado ◽  
...  
Keyword(s):  
Estrous Cycle ◽  
Captive Breeding ◽  
Detection System ◽  
Courtship Behavior ◽  
Animal Health ◽  
Reproductive Technologies ◽  
Time Of Day ◽  
Time Interval ◽  
Early Afternoon ◽  
Chi Square Analysis

Knowledge of the estrous cycle and behavior is important in managing captive breeding programs. However, such information is negligible in spiral-horned antelopes, including the eland. In the present study, conducted between September 2007 and March 2008, we sought to characterize mounting activity and courtship behavior in a group of eight adult eland females. Estrus was induced in groups of four females by treatment with 25 mg PGF2 ∝ (IM, Lutalyse®, Pharmacia and Upjohn Company, Kalamazoo, MI, USA) administered after 7 days of daily oral progestin (5 mL of 2.2% altrenogest, DPT Laboratories, San Antonio, TX, USA) or 11 days after an initial treatment of PGF2 ∝ (25 mg). The eight females received each treatment in a crossover design. Females were induced and monitored during the induced and subsequent natural estrus for 34 to 38 days. Observations for estrus behavior were initially assisted by using Estrotect™ heat detector patches (Rockyway, Inc., www.estrotect.com). Since January 2008, the HeatWatch® electronic heat detection system (CowChips, Denver, CO, USA) and an androgenized eland female were used to assist with heat detection. For androgenization, 8 pellets of Synovex-H® (Fort Dodge Animal Health, Fort Dodge, IA) comprising a total dose of 1600 mg testosterone propionate and 160 mg estradiol benzoate were implanted (SC) on the convex side of the ear. To confirm mounting activity detected by Estrotect™ or HeatWatch®, eland behavior was recorded continuously using an 8-channel real time DVR. Chi-square analysis was used to test the association between time of day (day or night) and the frequency of standing to be mounted. The cycle length (n = 6 females) was the time interval (d) between the first mounts at the induced and natural estrus. The time of mounts was determined for a total of 52 mounts. More than half of the mounts (n = 32 or 61.5%) occurred between 6 pm and 6 am (night); however, there was no association between the number of mounts and time of the day (p = 0.886). Analysis of mounts by quarters of the day showed that mounts were evenly distributed between early afternoon (noon to 6 pm: 29%), late afternoon (6 pm to midnight: 33%) and early morning (midnight to 6 am: 29%) but were less frequent during late morning, between 6 am and noon (10%) possibly due to interference by human activities. The number of mounts observed per female ranged from 1 to 20. Mounts lasted for 2 seconds or less. The duration of estrus ranged from 2.1 to 29.0 hours. Typical courtship behaviors included prolonged head butting, flehmen response and following the female in estrus before mounting. The average length of the estrous cycle, based on mounting activities, was 19.3 d (range: 17–24). Although further studies are required in herds with eland males, the present results suggest that estrus detection for captive breeding or application of reproductive technologies in the eland should be spread around different times of the day and night. We have also demonstrated that an electronic mount detection system can be applied to assist with determination of estrus in the eland.

scholarly journals A Security Log Analysis Scheme Using Deep Learning Algorithm for IDSs in Social Network

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Ming Zhong ◽  
Yajin Zhou ◽  
Gang Chen
Keyword(s):  
Deep Learning ◽  
Social Network ◽  
Intrusion Detection ◽  
Learning Algorithm ◽  
Detection System ◽  
Target System ◽  
Log Analysis ◽  
Clustering Methods ◽  
Analysis Scheme ◽  
Server System

Due to the complexity of the social network server system, various system abnormalities may occur and in turn will lead to subsequent system failures and information losses. Thus, to monitor the system state and detect the system abnormalities are of great importance. As the system log contains valuable information and records the system operating status and users’ behaviors, log data in system abnormality detection and diagnosis can ensure system availability and reliability. This paper discloses a log analysis method based on deep learning for an intrusion detection system, which includes the following steps: preprocess the acquired logs of different types in the target system; perform log analysis on the preprocessed logs using a clustering-based method; then, encode the parsed log events into digital feature vectors; use LSTM-based neural network and log collect-based clustering methods to learn the encoded logs to form warning information; lastly, trace the source of the warning information to the corresponding component to determine the point of intrusion. The paper finally implements the proposed intrusion detection method in the server system, thereby improving the system’s security status.

Galician Jewish Migration to Vienna

1999 ◽  
pp. 147-163
Author(s):  
Klaus Hödl
Keyword(s):  
New York ◽  
Social Network ◽  
North America ◽  
Western Europe ◽  
Local Culture ◽  
Economic Changes ◽  
Jewish Migration ◽  
The Social ◽  
Economic Transformations ◽  
The City

This chapter addresses two aspects of the socio-economic transformations which modernized Galicia in many respects — economic changes and nationalization of the social network — which permanently affected Jewish life in this Habsburg province. Both the economic and social aspects created such hardship for Jews that the effects were apparent internationally, in their massive emigration to western Europe and North America. Here, the chapter focuses on Vienna as one of the destinations of the Galician Jews, and on the special features of the city. It also discusses the ways in which the Galician Jews adjusted to the local culture and the methods the Viennese Jews used to help them acculturate. Although New York claimed the largest number of Galician Jewish emigrants between 1881 and 1910, the numbers choosing Vienna were not insignificant.

Hospitals: N.Y. Appellate Court Denies Move to Privatize Public Hospital

1999 ◽  
Vol 27 (2) ◽  
pp. 202-203
Author(s):  
Robert Chatham
Keyword(s):  
New York ◽  
New York City ◽  
York City ◽  
Public Health System ◽  
Municipal Hospital ◽  
The Public ◽  
Public Benefit ◽  
For Profit ◽  
Benefit Corporation ◽  
The City

The Court of Appeals of New York held, in Council of the City of New York u. Giuliani, slip op. 02634, 1999 WL 179257 (N.Y. Mar. 30, 1999), that New York City may not privatize a public city hospital without state statutory authorization. The court found invalid a sublease of a municipal hospital operated by a public benefit corporation to a private, for-profit entity. The court reasoned that the controlling statute prescribed the operation of a municipal hospital as a government function that must be fulfilled by the public benefit corporation as long as it exists, and nothing short of legislative action could put an end to the corporation's existence.In 1969, the New York State legislature enacted the Health and Hospitals Corporation Act (HHCA), establishing the New York City Health and Hospitals Corporation (HHC) as an attempt to improve the New York City public health system. Thirty years later, on a renewed perception that the public health system was once again lacking, the city administration approved a sublease of Coney Island Hospital from HHC to PHS New York, Inc. (PHS), a private, for-profit entity.

Bringing the Real World of Science to Children: A Partnership of the American Museum of Natural History and the City University of New York

2008 ◽  
Vol 12 (1) ◽  
Author(s):  
Anthony G Picciano ◽  
Robert V. Steiner
Keyword(s):  
United States ◽  
New York ◽  
Natural History ◽  
Local Governments ◽  
Compulsory Education ◽  
Development Program ◽  
The United States ◽  
American Museum ◽  
The World ◽  
The City

Every child has a right to an education. In the United States, the issue is not necessarily about access to a school but access to a quality education. With strict compulsory education laws, more than 50 million students enrolled in primary and secondary schools, and billions of dollars spent annually on public and private education, American children surely have access to buildings and classrooms. However, because of a complex and competitive system of shared policymaking among national, state, and local governments, not all schools are created equal nor are equal education opportunities available for the poor, minorities, and underprivileged. One manifestation of this inequity is the lack of qualified teachers in many urban and rural schools to teach certain subjects such as science, mathematics, and technology. The purpose of this article is to describe a partnership model between two major institutions (The American Museum of Natural History and The City University of New York) and the program designed to improve the way teachers are trained and children are taught and introduced to the world of science. These two institutions have partnered on various projects over the years to expand educational opportunity especially in the teaching of science. One of the more successful projects is Seminars on Science (SoS), an online teacher education and professional development program, that connects teachers across the United States and around the world to cutting-edge research and provides them with powerful classroom resources. This article provides the institutional perspectives, the challenges and the strategies that fostered this partnership.

Bahá’u’lláh’s Influence on the New York School of Painting: The “Unapprehended Inspiration” of Newman and Rothko

1991 ◽  
Vol 4 (1) ◽  
pp. 67-89
Author(s):  
Ross Woodman
Keyword(s):  
New York ◽  
Divine Revelation ◽  
New York School ◽  
The World ◽  
Mark Rothko ◽  
The Veil ◽  
The City

As members of the New York School of painters, Barnett Newman and Mark Rothko announced not only the passing away of an entire creation but also the bringing forth of a new one. Though unaware that they were living and painting in the City of the Covenant whose light would one day rise from darkness and decay to envelop the world even as their painting of light consciously arose from the void of a blank canvas, Newman’s and Rothko’s work may nevertheless be best understood as a powerful first evidence of what Bahá’u’lláh called “the rising Orb of Divine Revelation, from behind the veil of concealment.” Their work may yet find its true spiritual location in the spiritual city founded by ‘Abdu’l-Bahá on his visit to New York in 1912.

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