Salih Murat EgiGalatasaray Üniversitesi · Department of Computer Engineering
Salih Murat Egi
PhD
About
58
Publications
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308
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Introduction
Additional affiliations
November 2013 - present
May 2003 - November 2013
February 1990 - December 1999
Publications
Publications (58)
This paper presents the work performed to integrate a sensors network to a more complex and extensive system, represented by the architecture that constitutes the main output of the DiveSafe European project (G.A. EASME/EMFF/2017/1.2.1.12/SI/02/ SI2.789635). The latter also includes an underwater scooter, a Docking Station, a tablet and a whole com...
Background
The narcotic effect of hyperbaric nitrogen is most pronounced in air-breathing divers because it impairs diver’s cognitive and behavioral performance, and limits the depth of dive profiles. We aimed to investigate the cognitive effects of simulated (500 kPa) air environments in recreational SCUBA divers, revealed by auditory event-relate...
Photopletismography (PPG) is a simple, low cost and noninvasive technique, implemented by pulse-oximeters to measures several clinical parameters, such as hearth rate, oxygen saturation (Spo\(_{2}\)), respiration and other clinical diseases. Although monitoring of these parameters at rest does not present particular problems, processing PPG signals...
In last few years smart watches and activity trackers which count steps, calories, heart rate, and track sleep became the most widely used smart devices. These devices have the potential for not only tracking personal activity but also for creating big databases on health and demographic data collected from users. In this study, a multi-criteria de...
Introduction:
The risk for decompression sickness (DCS) after hyperbaric exposures (such as SCUBA diving) has been linked to the presence and quantity of vascular gas emboli (VGE) after surfacing from the dive. These VGE can be semi-quantified by ultrasound Doppler and quantified via precordial echocardiography. However, for an identical dive, VGE...
Diver carried computers are basically designed to measure the depth and time and provide safe ascent profiles in order to avoid decompression sickness in divers. All of the units in the market are based on embedded systems where the user cannot reprogram the units except entering limited number of dive parameters such as the content of cylinders an...
Divers Alert Network Europe has created a database with a large amount of dive-related data that has been collected since 1993 within the scope of the Diving Safety Laboratory citizen science project. The main objectives of this study are the grouping divers by their health information and revealing significant differences in diving parameters usin...
Dive computers have an important potential for citizen science projects where recreational SCUBA divers can upload the depth temperature profile and the geolocation of the dive to a central database which may provide useful information about the subsurface temperature of the oceans. However, their accuracy may not be adequate and needs to be evalua...
Despite the abundance of telemetric applications for ecology, behaviour and physiology of marine life, few efforts were reported about the use of acoustic telemetry for SCUBA divers. Such systems are required to follow the medical conditions of divers with chronic health problems such as diabetics. This study communicates the details of a study to...
Recreational divers use dive computers (DCs) which give information about safe ascent profile in order to prevent decompression illness that may result from decrease in ambient pressure. Dive computer are electronic devices used not only for appropriate ascent from depth but for their extra features such as tank pressure, gas time remaining, compas...
Introduction: Scuba diving is an important marine tourism sector, but requires proper safety standards to reduce the risks and increase accessibility to its market. To achieve safety goals, safety awareness and positive safety attitudes in recreational scuba diving operations are essential. However, there is no published research exclusively focusi...
Conservation and monitoring of marine systems and large-scale underwater data acquisition are too demanding for single researchers. The exploitation of citizen science and the development of new technology can significantly facilitate these action. In this work a novel system that allows scuba divers to collect data during their leisure activity is...
Drowning is the major cause of death in self-contained underwater breathing apparatus (SCUBA) diving. This study proposes an embedded system with a live and light-weight algorithm which detects the breathing of divers through the analysis of the intermediate pressure (IP) signal of the SCUBA regulator. A system composed mainly of two pressure senso...
This study is about a system for monitoring the
glucose of scuba divers while underwater. The system measures
the glucose of the diver at intervals of five minutes and transmits
the recorded data to the surface surpervision team. This is
specifically beneficial to the diabetic scuba divers, allowing their
supervisers to monitor their glucose level...
Marine researchers need consistent historical and georeferenced data from the marine environment in order to constantly monitor the biological condition of the habitat or to document delicate archeological sites. To overcome the difficulties related to the acquisition of high quantity of worthy data and to the accurate estimation of the position, t...
In order to obtain robust and measurable data from the marine environment, citizen science projects need user-friendly tools that, during dives, autonomously gather information in an easy, low-cost and integrated way. Data collected from different devices and by different untrained divers must have good estimation of the position where the informat...
"CADDY - Cognitive Autonomous Diving Buddy" is an FP7 project that that is devoted to developing a cognitive underwater robotic system that will help divers during their activities in this hazardous environment. The envisioned resulting system will play a threefold role similar to those that a human buddy diver should have: buddy "observer", buddy...
Divers Alert Network (DAN) created a database (DB) with a big amount of dive related data which has been collected since 1994 within the scope of Dive Safety Laboratory (DSL) project. The aim of this study is to analyze the DB using data mining techniques. The clustering of divers by their health and demographic information and reveal significant d...
Divers operate in harsh and poorlymonitored environments, inwhich the slightest unexpected disturbance, technical malfunction, or lack of attention can have catastrophic consequences. Motivated by these considerations, the “CADDY—Cognitive Autonomous Diving Buddy” FP7 project sets forth the main goal of developing a cooperative autonomous underwate...
This study is about a system for monitoring the breathing cycles of divers and the functioning of regulators underwater. It warns the diver and other surrounding divers in case of long time cessation of respiration or if the regulator’s intermediate pressure is out of predefined limits, enabling immediate intervention to regulator and breathing pro...
"CADDY - Cognitive Autonomous Diving Buddy" is an FP7 project that started in January 2014. Seven partner institutions have joined their efforts towards developing a cognitive underwater robotic system that will help divers during their activities in this hazardous environment. The resulting system will play a threefold role similar to those that a...
This paper summarizes the main accomplishments of the first year of the FP7 project “CADDY — Cognitive Autonomous Diving Buddy”. The main objective of the project is to replace a human buddy diver with an autonomous underwater vehicle and add an autonomous surface vehicle to improve monitoring, assistance, and safety of the diver's mission. While a...
The main objective of the CADDY project is to replace a human buddy diver with an autonomous underwater vehicle and add a new autonomous surface vehicle to improve monitoring, assistance, and safety of the diver's mission. However, the use of robots underwater may also bring additional safety requirements. Within the scope of this research, the exi...
Introduction:
Personnel selection for different commercial diving jobs is time-consuming and subjective, This paper proposes a combination of two multiple-criteria decision-making (MCDM) methods to provide an objective tool for evaluation according to two main selection criteria: work experience and physical fitness.
Method:
Subcriteria were com...
Diving above sea level has different motivations for recreational, military, commercial and scientific activities. Despite the apparently wide practice of inland diving, there are three major discrepancies about diving at altitude: threshold elevation that requires changes in sea level procedures; upper altitude limit of the applicability of these...
One of the major problems in dive data collection is the fact that the dive computers used in data collections do not have a practical interface. The divers first needs to buy a cable and a software; then after each dive they have to connect their dive computer to a desktop or a portable computer and transmit their logs to the databases. This proje...
The current onshore commercial diving systems still prefer to use analog panels with pneumogauges to measure the depth of the divers. The major drawback of these systems is to record manually the profile. Although the profile often is a square, emergency events and unplanned extra tasks may deviate the square profile and it may be impossible to rec...
The existence of a right-to-left shunt may increase the likelihood of micro-embolism by allowing a flux of bubbles under hyperbaric conditions. The aim of the study was to measure the relationship between these shunts and bubbles in 10 consecutive subjects using trans-thoracic and trans-esophageal echocardiography. In video frames, all cardiac cham...
Sualtında çalışan elektronik cihaz dendiğinde dalgıçlarca en çok kullanılan ekipmanlardan birisi dalış bilgisayarıdır. Dalış bilgisayarları, bir sualtı elektronik ekipmanı olarak dalgıçların tehditlerinden biri olan dekompresyon hastalığından korunmaları için kolaylık sağlar. Temel olarak görevi tabloların matematiksel modellerini kullanarak dokula...
Dive computers (DCs) are compact digital devices which perform the task of decompression management without the need for a watch or dive tables. As the diving industry grows, the number of different DCs in the market increases and users have many alternatives to select an effective one among them. Considering that it is a life supporting device, se...
Bubble recognition is a challenging problem in a broad range from mechanics to medicine. These gasfilled structures whose pattern and morphology alter in their surrounding environment would be counted either manually or with computational recognition procedures. In cardiology, user dependent bubble detection and temporal counting in videos require...
The selection of personnel for diving operations is a challenging task requiring a detailed assessment of the candidates. In this study, we use computer aided multi-criteria decision support tools in order to evaluate the divers according to their work experience and physical fitness condition.
The importance weights of the sub-criteria are determi...
2D echocardiography which is the golden standard in clinics becomes the new trend of analysis in diving via its high advantages
in portability for diagnosis. By the way, the major weakness of this system is non-integrated analysis platform for bubble
recognition. In this study, we developed a full automatic method to recognize bubbles in videos. Ga...
In cardiology, automatic recognition and image analysis still conserve computational challenges in terms of medical guidance and diagnosis. Bubbles or microemboli that circulate into cardiopulmonary system are considered suspicious for several medical problems such as decompression sickness, stroke and migraine. The aim of our work is to develop an...
Post decompression records in echocardiography are considered to detect micro bubbles and to survey unexplained decompression sickness which is commonly examined by standardized methods such as dive computers and tables. In this study, existent bubbles are detected on transthoracic echicardiografic frames recorded after recreational diving. Bubble...
The term decompression illness (DCI) describes maladies resulting from inadequate decompression, but there is little consensus concerning clinically useful DCI subclasses. Our aim was to explore an objective DCI classification using multivariate statistics to assess naturally associated clusters of DCI manifestations. We also evaluated their mappin...
We have previously suggested a classification of DCI using multivariate statistics to assess naturally associated clusters of signs and symptoms based on 1929 cases reported by hyperbaric chambers to the Divers Alert Network from 1999 to 2003. The aim of this study is to validate the reliability of the previous work by applying three different alte...
Several illnesses such as paradoxical embolism, decompression sickness, migraine and cerebral ischemia are characterized by bubbles which might cross the septum wall between left and right atrium. In this study, we aimed to detect bubbles on echocardiographic frames which are segmented automatically using Snakes method. In recent studies, analyzes...
Despite the abundance of telemetric applications for ecology, behavior and physiology of marine life, few efforts were reported about the use of acoustic telemetry for SCUBA divers. The objective of this study is to design and test an acoustic telemetry system for monitoring breathing gases of a Dräger Dolphin semi-closed circuit rebreather as well...
It is possible to detect venous gas bubbles by listening to the Doppler audio signals. However, a serious disadvantage of the audio evaluation is the inability of continuous monitoring and the inter-rater agreement. Several researchers have worked on the automated detection of emboli, but no current system has the required sensitivity and specifici...
In 1990, Boğaziçi University (Istanbul, Turkey) launched an altitude diving program to develop techniques and safe decompression profiles for diving at high terrestrial altitudes. Following pioneering diving expeditions to lakes at high elevations in 1990-1992, it was deemed necessary to calculate new tables.
Bottom time limits for dives requiring...
Decompression sickness (DCS) is the result of bubble formation in the body due to excessive/rapid reduction in the ambient pressure. Existing models relate the decompression stress either to the inert gas load or to the size of a single bubble in a tissue compartment. This paper presents a model that uses the gas exchange equations combined with bu...
There is no consensus on the number of compartments and the half-lives (T1/2) used in the calculation of inert gas exchange and decompression sickness (DCS) boundary in existing dive tables and decompression computers. We propose the use of a continuous variable for the tissue half-lives, allowing the simulation of an infinite number of compartment...
In this study, fat free mass (FFM) and % fat were assessed by
multisite, multifrequency bioimpedance analysis (BIA), on divers who
took part in the altitude diving research program at Mountain Kackar
(3412 m). Impedances were measured from different sites (limbs and
trunk) at 5 frequencies using a custom made 4-probe impedance analyzer.
Skinfold an...
Diving at altitude requires different tables from those at sea level due to the reduction in surface ambient pressure. Several algorithms extrapolating sea-level diving experimental data have been proposed to construct altitude diving tables. The rationale for these algorithms is reviewed together with the conservatism of the resulting tables and d...
In brain and neck surgery, media where the ambient pressure changes significantly like SCUBA diving and high altitude activities, "Venous Gas Embolism (VGE)" may occur. When VGE occurs, the air bubbles start to navigate within the blood circulatory system. They are first collected at the right site of heart. Then the blood in the right ventricle is...
Considering the sweeping changes that modern technology is creating in daily life, the authors argue that extra-curricula activities can help enhance the quality of engineering education. Students working with their teachers on projects relevant to society as a whole can be better motivated to commit themselves to a life-long education programme. S...