A Call Conference Room Interception Attack and Its Detection

Author(s):  
Nikos Vrakas ◽  
Dimitris Geneiatakis ◽  
Costas Lambrinoudakis
Keyword(s):  
2017 ◽  
Vol 118 ◽  
pp. 39-49 ◽  
Author(s):  
Abdelghani Gramez ◽  
Fouad Boubenider

Author(s):  
Muhammad Usman Sheikh ◽  
Kalle Ruttik ◽  
Riku Jäntti ◽  
Jyri Hämäläinen

AbstractThe aim of this work is to study the impact of small receiver displacement on a signal propagation in a typical conference room environment at a millimeter wave frequency of 60 GHz. While channel measurements provide insights on the propagation phenomena, their use for the wireless system performance evaluation is challenging. Whereas, carefully executed three-dimensional ray tracing (RT) simulations represent a more flexible option. Nevertheless, a careful validation of simulation methodology is needed. The first target of this article is to highlight the benefits of an in-house built three-dimensional RT tool at 60 GHz and shows the effectiveness of simulations in predicting different characteristics of the channel. To validate the simulation results against the measurements, two different transmitter (Tx) positions and antenna types along with ten receiver (Rx) positions are considered in a typical conference room. In first system configuration, an omnidirectional antenna is placed in the middle of the table, while in the second system configuration a directed horn antenna is located in the corner of the meeting room. After validating the simulation results with the measurement data, in the second part of this work, the impact of a small change, i.e., 20 cm in the receiver position, is studied. To characterize the impact, we apply as performance indicators the received power level, root mean square delay spread (RMS-DS) and RMS angular spread (RMS-AS) in azimuth plane. The channel characteristics are considered with respect to the direct orientation (DO), i.e., the Rx antenna is directed toward the strongest incoming path. Different antenna configurations at the Tx and Rx side are applied to highlight the role of antenna properties on the considered channel characteristics. Especially, in the second system configuration the impact of different antenna half power beamwidth on different considered channel characteristics is highlighted through acquired simulation results. The validation of results shows the RMS error of only 2–3 dB between the measured and simulated received power levels for different Tx configurations in the direction of DO. Results indicate that only a small change of the Rx position may result a large difference in the received power level even in the presence of line-of-sight between the Tx and Rx. It is found that the STD of received power level across the room increases with the decrease in HPBW of the antenna. As can be expected, directed antennas offer lower value of RMS-DS and RMS-AS compared with isotropic antenna.


Author(s):  
Sarit Markovich ◽  
Oded Golan ◽  
Charlotte Snyder

In March 2017, Oded Golan sat in his technology startup's conference room with his co-founder, pondering the fate of their company, Start A Fire. In just four years, the two entrepreneurs had taken an idea that started in Golan's apartment in Tel Aviv and turned it into a company that had raised $3.5 million in venture capital funding and served more than 3,000 of the world's biggest brands using an innovative content distribution and social media management platform that enabled brands to improve communication and engagement with their followers


Author(s):  
Fahim Anzum ◽  
Fahim Ahmed ◽  
M. Shariful Azim ◽  
Mosaddek Hossain ◽  
Shifat Zaman ◽  
...  
Keyword(s):  

Author(s):  
Maribeth Back ◽  
Gene Golovchinsky ◽  
Pernilla Qvarfordt ◽  
William van Melle ◽  
John Boreczky ◽  
...  

Author(s):  
Generoso Abes

Consultants and more senior co-resident physicians at the Philippine General Hospital (PGH) would call him “Caloy.” Hardly would I hear anybody (including our ENT department secretary) address him as Dr. Reyes. This was not because he was not a respected faculty member. Rather, he was everybody’s friend and he probably preferred to be addressed by his nickname. Dr. Carlos P. Reyes was a tall, friendly guy, easily recognizable while walking through the short PGH corridor stretching from the old ENT Ward (Ward 3) to the old ENT operating room (OR) called Floor 15, later designated as the PGH Nursing Office. He would almost always be holding either an expensive photography camera, electronic gadget, ENT OR instrument, or car magazines – suggesting his varied interests aside from having good knowledge of Otolaryngology, particularly Otology. He would usually stop and chat with an acquaintance about his new medical or non-medical interests. I first met Dr. Caloy when I was the first year resident assigned to the Otology section. He would call me “Ging” while presenting the ear patients at the outpatient department (OPD) Ear Clinic, only to learn later that he would address all unfamiliar persons by that name. He was kind, helpful and very understanding. Equipped with ample information in Otology he gathered from postgraduate studies abroad, he would selflessly share these with the residents in order to sharpen our diagnostic acumen. He would instruct us to rely on concise yet complete clinical examination, involving audiologic evaluation tools and meager radiologic information in considering differential diagnoses. He was quite willing to assist us in our learning processes, particularly on how to distinguish middle ear from inner ear disorders, and cochlear versus retrocochlear diseases. Since we did not have any audiologist at that time, he admonished us to carry out the needed audiometric evaluations on our ear patients ourselves in order to learn both the techniques of the procedures and their limitations. Hence, after the OPD clinic we would not only perform routine pure tone and speech audiometric tests but also special examinations like the Bekesy test, short increment sensitivity index (SISI) test, alternate binaural loudness balance (ABLB) test and the test for tone decay. We would then discuss the test results during our next ear clinic and we would listen and be amazed at how Dr. Caloy would integrate the information and arrive at the complex diagnosis. Dr. Caloy was our mentor at the time when refinements in tympanoplasty and mastoidectomy aroused the excitement and imagination of budding otologists worldwide. Whereas canal down mastoidectomy was the usual norm to safely remove common mastoid pathology like cholesteatoma, Dr. Caloy introduced the concept of intact canal wall mastoidectomy that avoids or mitigates recurrent postoperative cleaning of the mastoid bone. The period was also the dawn of neuro-otology when Dr. William House popularized the transmastoid approach for acoustic neuroma and the endolymphatic mastoid shunt as treatment for Meniere’s disease. In order to teach us the anatomical and surgical principles of performing these procedures, Dr. Caloy set up the first temporal bone dissection laboratory in the country at the mezzanine above the ENT conference room. He would offer the course to all ENT residents-in-training and consultants nationwide. He practically revolutionized the method of otologic surgery by requiring ENT surgeons to practice doing ear surgery in the temporal bone dissection lab prior to performing ear surgeries in the operating room. In addition, he advocated the use of the operating microscope and dental drills in place of the old bone gouges, chisels and bone ronguers. His ideas were later adopted by other ENT training institutions as we see today. The requirement that every ENT resident must undergo temporal bone dissection in the course of his training obviously stemmed from the efforts of Dr. Caloy. Many senior ENT consultants who are still with us today were former students of Dr. Caloy in his temporal bone lab Unfortunately, before finishing my residency training, Dr Caloy expeditiously left the PGH ENT department for unknown reasons. He then set up his private clinic in Quezon City and later joined the ENT department of University of Santo Tomas. Reflecting on the significant yet probably unknown achievements of Dr. Caloy toward the advancement of otology and neuro-otology in our country, I realize how blessed I was to be one of his students during that brief period when he was still with us at UP-PGH. With our profound gratitude Sir, we will always remember you.


Author(s):  
Tin Wegel

On January 19, 2018 about 80 people sat in an unassuming conference room on the campus of the University of Northern Colorado in Greeley, chatting and signing away cheerfully with their seat neighbors in anticipation of the keynote address by Susanne Even from Indiana University in Bloomington, IN. The lively crowd of students and faculty members from across the country was clearly already in a chatty mood before the official introduction by Erin Noelliste, the lead organizer of the 5th Scenario Symposium on Performative Pedagogy, kicked off an engaging and interactive evening and day ahead. The idea behind this particular symposium was to focus on the use of drama to enhance learning in education and foreign languages, as the program stated. It was the second of its kind held in the US and thus aimed at broadening readership and scope of the Scenario Journal, with the goal of inspiring creativity and improvisation in foreign language classrooms. The keynote speaker Susanne Even took the podium and I dare say she could not have hoped for a more involved group of lifelong learners. Her keynote talk, made accessible to all participants by sign language interpreters, was the first presentation in the 2018 ...


2019 ◽  
Vol 12 (1) ◽  
pp. 1-2 ◽  
Author(s):  
Sean Smith

Library assessment at the BU School of Theology Library identified one glaring weakness of our institution: the lack of useable collaborative/group study space. Staff identified one particular spot: a beautiful, but rarely used conference room for group study space, down a forbidding administrative hallway, as a short-term bandage for this weakness. Despite its deficiencies, this short-term solution it has become a popular spot in the library. Patron visits to the library increased over 10% during the first couple of months of the Fall 2018 semester. In an era of tightening library budgets for small, academic, and Theological libraries, aggressive data-collection and creative re-imagining of space can pay big dividends.


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