I am working in the fields of virtual reality, digital history, digital archaeology, as well as artificial intelligence and robotics. Address: United Kingdom
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2019
Eight of the greatest Ionic temples of the ancient world were built on or near the Aegean coast o... more Eight of the greatest Ionic temples of the ancient world were built on or near the Aegean coast of Turkey, from the dipteros of Chersiphron in Ephesos to the pseudo-dipteroi of Hermogenes in Teos and Magnesia. The temples were the epitome of elegance and splendour, difficult to surpass in terms of architectural achievement for a period of four centuries from 6 th century to 2 nd century BC which spans Archaic, Classical and Hellenistic eras. All of these edifices now lie in ruins. As various empires in the region rose and fell, the temples suffered looting and destruction. Nature also played a part with rivers inundating the temenoses and silting up the archaeological remains, and earthquakes toppling columns and reducing the cellas to rubble. Despite this catacylism, tens of hundreds of years after they were built, these marble buildings still tantalise the human imagination. The objective of this paper is to present a systematic and comprehensive treatise of the logical procedure of the 3D visualisation of these monuments of the ancient cities of classical antiquity. The virtual rediscovery and visual recovery can never replace or remedy the loss of the temples. It can, however, visually awaken the imagination and provide a hypothesised experience of the temples as well as restoring a sense of the architecture and the place.
Palmyra in Syria had been, with its Corinthian colonnades, amphitheater and splendidly built temp... more Palmyra in Syria had been, with its Corinthian colonnades, amphitheater and splendidly built temples to ancient gods, source of inspiration and imagination for Western architecture. Virtual Palmyra project offers a glimpse of the grandeur and beauty of the ruins of Palmyra, none of which any longer remains. 3D models of the most significant structures of Palmyra, including Temple of Bel and Temple of Baalshamin which have been leveled as a result of conflict based vandalism , as well as the colonnaded street and the amphitheater are presented as "ghost images" through reconstructed 3D models. Focus has been in maintaining the accuracy and validity of the visualized data of the relics and environment of Palmyra, as they were once extant.
The trend in the world of Information Technology (IT) is getting increasingly large and difficult... more The trend in the world of Information Technology (IT) is getting increasingly large and difficult projects rather than smaller and easier. However, the data on large-scale IT project success rates provide cause for concern. This paper seeks to answer why large-scale IT projects are different from and more difficult than other typical engineering projects. Drawing on the industrial experience, a compilation of the conditions that influence failure is presented. With a view to improve success rates solutions are suggested.
Defense and Aerospace environment is continuously striving to keep up with increasingly sophistic... more Defense and Aerospace environment is continuously striving to keep up with increasingly sophisticated Information Technology (IT) in order to remain effective in today-s dynamic and unpredictable threat environment. This makes IT one of the largest and fastest growing expenses of Defense. Hundreds of millions of dollars spent a year on IT projects. But, too many of those millions are wasted on costly mistakes. Systems that do not work properly, new components that are not compatible with old ones, trendy new applications that do not really satisfy defense needs or lost through poorly managed contracts. This paper investigates and compiles the effective strategies that aim to end exasperation with low returns and high cost of Information Technology acquisition for defense; it tries to show how to maximize value while reducing time and expenditure.
Abstract—The trend in the world of Information Technology (IT) is getting increasingly large and ... more Abstract—The trend in the world of Information Technology (IT) is getting increasingly large and difficult projects rather than smaller and easier. However, the data on large-scale IT project success rates provide cause for concern. This paper seeks to answer why large-scale IT projects are different from and more difficult than other typical engineering projects. Drawing on the industrial experience, a compilation of the conditions that influence failure is presented. With a view to improve success rates solutions are suggested. Keywords—Software engineering, software economics, project management, large-scale projects.
DESIGN AND IMPLEMENTATION OF A MOBILE SEARCH AND RESCUE ROBOT Human being faces with unprecedente... more DESIGN AND IMPLEMENTATION OF A MOBILE SEARCH AND RESCUE ROBOT Human being faces with unprecedented number and scales of destructive catastrophe in natural and human-made disasters in the history. So many victims have suffered badly in disaster areas after destructive catastrophe. This situation leads people to generate solution for search and rescue technology to help victims. One of the most important area for this technology is about search and rescue robots. The robots equipped with sensors and other technological devices are attracting more and more attentions from researchers and rescuers. In this thesis, a mobile search and rescue robot is designed and implemented. The robot is partly rely on the instructions to the human operators for its operation, on the other hand it provides information from the environment for situation assessment. Design and implementation physical robot’s process are described in this paper.
2017 International Artificial Intelligence and Data Processing Symposium (IDAP), 2017
Humankind encounters with unprecedented number and scales of disasters which stem from natural an... more Humankind encounters with unprecedented number and scales of disasters which stem from natural and human-made causes. So many victims have suffered severely in those catastrophes that compelled generation and development of search and rescue technology to help victims in future. One of the most important application areas within this scope is the search and rescue robots. The robots equipped with capabilities of sensing and maneuvering in the areas of calamity are enticing more and more attentions from researchers and rescuers. This project aims at realization of a new generation of search and rescue robot which can work in autonomous and semi-autonomous modes and can be used in harsh physical environments of disaster regions to carry out the given tasks more effectively by the use of advanced and economic sensors. In this paper, a mobile search and rescue robot called SALVOR is designed and implemented. SALVOR partly relies on the data from its sensors about the environment and partly on instructions from the human operators for its operation. On the other hand it provides information about its surroundings for situation assessment. Design and implementation processes of SALVOR are described and its test results are presented in an arena which simulates the calamity zone.
Reconstructions of the past with the advent of 3D computer graphics and high resolution rendering... more Reconstructions of the past with the advent of 3D computer graphics and high resolution rendering are increasingly produced and maintained in digital form, thus creating a legacy: Digital cultural heritage. Digital cultural heritage requires serious attention and is the subject of this paper. The reconstruction of the lost Ionic temples of the western shores of Aegean Sea is the main focus. The history of their construction, destruction and reconstruction loops are traced. The exceptional architects who had worked out the style and the principles of construction are looked into. Superstructures they created are studied with the aid of the accounts of the ancient writers, fragments in museums and surviving portions. Finally, their 3D reconstructions are realized so far as possible.
This paper addresses the role of the digital tools and methods in the preservation of cultural he... more This paper addresses the role of the digital tools and methods in the preservation of cultural heritage. As the destruction of Palmyra made international headlines, digital tools emerged as a key tool to fight back against the total deletion of the heritage site from memories. Palmyra in Syria had been, with its Corinthian colonnades, theatre and splendidly built temples to ancient gods, source of inspiration and imagination for Western architecture. In this paper, the aim is reviving the lost reality of Palmyra by digitally reconstructing its "ghost images" from rubbles. The paper offers a glimpse of the grandeur and beauty of the ruins of Palmyra, none of which any longer remains in its entirety. 3D models of the most significant structures of Palmyra, including Temple of Bel and Temple of Baalshamin which have been levelled as a result of conflict based vandalism, as well as the Grand Colonnaded Street and the theatre are presented as "ghost images" through reconstructed 3D models. The focus has been in maintaining the accuracy and validity of the visualised data of the relics and environment of Palmyra, as they were once extant. Following the trauma caused by the destruction of Palmyra, these reconstructions revive in our memory the splendour of the city in the Greco-Roman Period.
A VSS control which switches between PD (Proportional and Derivative) and CEA (Constant Error Acc... more A VSS control which switches between PD (Proportional and Derivative) and CEA (Constant Error Acceleration) schemes is presented in this article. It is applied to steer robot manipulators in order to satisfy "no overshoot" and "high response speed" requirements. Simulation results verify that with this approach, maximum actuator capacity can be exploited while avoiding danger of overshoots
This paper addresses the role of the digital tools and methods in the preservation of cultural he... more This paper addresses the role of the digital tools and methods in the preservation of cultural heritage. As the destruction of Palmyra made international headlines, digital tools emerged as a key tool to fight back against the total deletion of the heritage site from memories. Palmyra in Syria had been, with its Corinthian colonnades, theatre and splendidly built temples to ancient gods, source of inspiration and imagination for Western architecture. In this paper, the aim is reviving the lost reality of Palmyra by digitally reconstructing its "ghost images" from rubbles. The paper offers a glimpse of the grandeur and beauty of the ruins of Palmyra, none of which any longer remains in its entirety. 3D models of the most significant structures of Palmyra, including Temple of Bel and Temple of Baalshamin which have been levelled as a result of conflict based vandalism, as well as the Grand Colonnaded Street and the theatre are presented as "ghost images" through reconstructed 3D models. The focus has been in maintaining the accuracy and validity of the visualised data of the relics and environment of Palmyra, as they were once extant. Following the trauma caused by the destruction of Palmyra, these reconstructions revive in our memory the splendour of the city in the Greco-Roman Period.
This paper addresses the role of the digital tools and methods in the preservation of cultural he... more This paper addresses the role of the digital tools and methods in the preservation of cultural heritage. As the destruction of Palmyra made international headlines, digital tools emerged as a key tool to fight back against the total deletion of the heritage site from memories. Palmyra in Syria had been, with its Corinthian colonnades, theatre and splendidly built temples to ancient gods, source of inspiration and imagination for Western architecture. In this paper, the aim is reviving the lost reality of Palmyra by digitally reconstructing its "ghost images" from rubbles. The paper offers a glimpse of the grandeur and beauty of the ruins of Palmyra, none of which any longer remains in its entirety. 3D models of the most significant structures of Palmyra, including Temple of Bel and Temple of Baalshamin which have been levelled as a result of conflict based vandalism, as well as the Grand Colonnaded Street and the theatre are presented as "ghost images" through reconstructed 3D models. The focus has been in maintaining the accuracy and validity of the visualised data of the relics and environment of Palmyra, as they were once extant. Following the trauma caused by the destruction of Palmyra, these reconstructions revive in our memory the splendour of the city in the Greco-Roman Period.
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2019
Eight of the greatest Ionic temples of the ancient world were built on or near the Aegean coast o... more Eight of the greatest Ionic temples of the ancient world were built on or near the Aegean coast of Turkey, from the dipteros of Chersiphron in Ephesos to the pseudo-dipteroi of Hermogenes in Teos and Magnesia. The temples were the epitome of elegance and splendour, difficult to surpass in terms of architectural achievement for a period of four centuries from 6 th century to 2 nd century BC which spans Archaic, Classical and Hellenistic eras. All of these edifices now lie in ruins. As various empires in the region rose and fell, the temples suffered looting and destruction. Nature also played a part with rivers inundating the temenoses and silting up the archaeological remains, and earthquakes toppling columns and reducing the cellas to rubble. Despite this catacylism, tens of hundreds of years after they were built, these marble buildings still tantalise the human imagination. The objective of this paper is to present a systematic and comprehensive treatise of the logical procedure of the 3D visualisation of these monuments of the ancient cities of classical antiquity. The virtual rediscovery and visual recovery can never replace or remedy the loss of the temples. It can, however, visually awaken the imagination and provide a hypothesised experience of the temples as well as restoring a sense of the architecture and the place.
Palmyra in Syria had been, with its Corinthian colonnades, amphitheater and splendidly built temp... more Palmyra in Syria had been, with its Corinthian colonnades, amphitheater and splendidly built temples to ancient gods, source of inspiration and imagination for Western architecture. Virtual Palmyra project offers a glimpse of the grandeur and beauty of the ruins of Palmyra, none of which any longer remains. 3D models of the most significant structures of Palmyra, including Temple of Bel and Temple of Baalshamin which have been leveled as a result of conflict based vandalism , as well as the colonnaded street and the amphitheater are presented as "ghost images" through reconstructed 3D models. Focus has been in maintaining the accuracy and validity of the visualized data of the relics and environment of Palmyra, as they were once extant.
The trend in the world of Information Technology (IT) is getting increasingly large and difficult... more The trend in the world of Information Technology (IT) is getting increasingly large and difficult projects rather than smaller and easier. However, the data on large-scale IT project success rates provide cause for concern. This paper seeks to answer why large-scale IT projects are different from and more difficult than other typical engineering projects. Drawing on the industrial experience, a compilation of the conditions that influence failure is presented. With a view to improve success rates solutions are suggested.
Defense and Aerospace environment is continuously striving to keep up with increasingly sophistic... more Defense and Aerospace environment is continuously striving to keep up with increasingly sophisticated Information Technology (IT) in order to remain effective in today-s dynamic and unpredictable threat environment. This makes IT one of the largest and fastest growing expenses of Defense. Hundreds of millions of dollars spent a year on IT projects. But, too many of those millions are wasted on costly mistakes. Systems that do not work properly, new components that are not compatible with old ones, trendy new applications that do not really satisfy defense needs or lost through poorly managed contracts. This paper investigates and compiles the effective strategies that aim to end exasperation with low returns and high cost of Information Technology acquisition for defense; it tries to show how to maximize value while reducing time and expenditure.
Abstract—The trend in the world of Information Technology (IT) is getting increasingly large and ... more Abstract—The trend in the world of Information Technology (IT) is getting increasingly large and difficult projects rather than smaller and easier. However, the data on large-scale IT project success rates provide cause for concern. This paper seeks to answer why large-scale IT projects are different from and more difficult than other typical engineering projects. Drawing on the industrial experience, a compilation of the conditions that influence failure is presented. With a view to improve success rates solutions are suggested. Keywords—Software engineering, software economics, project management, large-scale projects.
DESIGN AND IMPLEMENTATION OF A MOBILE SEARCH AND RESCUE ROBOT Human being faces with unprecedente... more DESIGN AND IMPLEMENTATION OF A MOBILE SEARCH AND RESCUE ROBOT Human being faces with unprecedented number and scales of destructive catastrophe in natural and human-made disasters in the history. So many victims have suffered badly in disaster areas after destructive catastrophe. This situation leads people to generate solution for search and rescue technology to help victims. One of the most important area for this technology is about search and rescue robots. The robots equipped with sensors and other technological devices are attracting more and more attentions from researchers and rescuers. In this thesis, a mobile search and rescue robot is designed and implemented. The robot is partly rely on the instructions to the human operators for its operation, on the other hand it provides information from the environment for situation assessment. Design and implementation physical robot’s process are described in this paper.
2017 International Artificial Intelligence and Data Processing Symposium (IDAP), 2017
Humankind encounters with unprecedented number and scales of disasters which stem from natural an... more Humankind encounters with unprecedented number and scales of disasters which stem from natural and human-made causes. So many victims have suffered severely in those catastrophes that compelled generation and development of search and rescue technology to help victims in future. One of the most important application areas within this scope is the search and rescue robots. The robots equipped with capabilities of sensing and maneuvering in the areas of calamity are enticing more and more attentions from researchers and rescuers. This project aims at realization of a new generation of search and rescue robot which can work in autonomous and semi-autonomous modes and can be used in harsh physical environments of disaster regions to carry out the given tasks more effectively by the use of advanced and economic sensors. In this paper, a mobile search and rescue robot called SALVOR is designed and implemented. SALVOR partly relies on the data from its sensors about the environment and partly on instructions from the human operators for its operation. On the other hand it provides information about its surroundings for situation assessment. Design and implementation processes of SALVOR are described and its test results are presented in an arena which simulates the calamity zone.
Reconstructions of the past with the advent of 3D computer graphics and high resolution rendering... more Reconstructions of the past with the advent of 3D computer graphics and high resolution rendering are increasingly produced and maintained in digital form, thus creating a legacy: Digital cultural heritage. Digital cultural heritage requires serious attention and is the subject of this paper. The reconstruction of the lost Ionic temples of the western shores of Aegean Sea is the main focus. The history of their construction, destruction and reconstruction loops are traced. The exceptional architects who had worked out the style and the principles of construction are looked into. Superstructures they created are studied with the aid of the accounts of the ancient writers, fragments in museums and surviving portions. Finally, their 3D reconstructions are realized so far as possible.
This paper addresses the role of the digital tools and methods in the preservation of cultural he... more This paper addresses the role of the digital tools and methods in the preservation of cultural heritage. As the destruction of Palmyra made international headlines, digital tools emerged as a key tool to fight back against the total deletion of the heritage site from memories. Palmyra in Syria had been, with its Corinthian colonnades, theatre and splendidly built temples to ancient gods, source of inspiration and imagination for Western architecture. In this paper, the aim is reviving the lost reality of Palmyra by digitally reconstructing its "ghost images" from rubbles. The paper offers a glimpse of the grandeur and beauty of the ruins of Palmyra, none of which any longer remains in its entirety. 3D models of the most significant structures of Palmyra, including Temple of Bel and Temple of Baalshamin which have been levelled as a result of conflict based vandalism, as well as the Grand Colonnaded Street and the theatre are presented as "ghost images" through reconstructed 3D models. The focus has been in maintaining the accuracy and validity of the visualised data of the relics and environment of Palmyra, as they were once extant. Following the trauma caused by the destruction of Palmyra, these reconstructions revive in our memory the splendour of the city in the Greco-Roman Period.
A VSS control which switches between PD (Proportional and Derivative) and CEA (Constant Error Acc... more A VSS control which switches between PD (Proportional and Derivative) and CEA (Constant Error Acceleration) schemes is presented in this article. It is applied to steer robot manipulators in order to satisfy "no overshoot" and "high response speed" requirements. Simulation results verify that with this approach, maximum actuator capacity can be exploited while avoiding danger of overshoots
This paper addresses the role of the digital tools and methods in the preservation of cultural he... more This paper addresses the role of the digital tools and methods in the preservation of cultural heritage. As the destruction of Palmyra made international headlines, digital tools emerged as a key tool to fight back against the total deletion of the heritage site from memories. Palmyra in Syria had been, with its Corinthian colonnades, theatre and splendidly built temples to ancient gods, source of inspiration and imagination for Western architecture. In this paper, the aim is reviving the lost reality of Palmyra by digitally reconstructing its "ghost images" from rubbles. The paper offers a glimpse of the grandeur and beauty of the ruins of Palmyra, none of which any longer remains in its entirety. 3D models of the most significant structures of Palmyra, including Temple of Bel and Temple of Baalshamin which have been levelled as a result of conflict based vandalism, as well as the Grand Colonnaded Street and the theatre are presented as "ghost images" through reconstructed 3D models. The focus has been in maintaining the accuracy and validity of the visualised data of the relics and environment of Palmyra, as they were once extant. Following the trauma caused by the destruction of Palmyra, these reconstructions revive in our memory the splendour of the city in the Greco-Roman Period.
This paper addresses the role of the digital tools and methods in the preservation of cultural he... more This paper addresses the role of the digital tools and methods in the preservation of cultural heritage. As the destruction of Palmyra made international headlines, digital tools emerged as a key tool to fight back against the total deletion of the heritage site from memories. Palmyra in Syria had been, with its Corinthian colonnades, theatre and splendidly built temples to ancient gods, source of inspiration and imagination for Western architecture. In this paper, the aim is reviving the lost reality of Palmyra by digitally reconstructing its "ghost images" from rubbles. The paper offers a glimpse of the grandeur and beauty of the ruins of Palmyra, none of which any longer remains in its entirety. 3D models of the most significant structures of Palmyra, including Temple of Bel and Temple of Baalshamin which have been levelled as a result of conflict based vandalism, as well as the Grand Colonnaded Street and the theatre are presented as "ghost images" through reconstructed 3D models. The focus has been in maintaining the accuracy and validity of the visualised data of the relics and environment of Palmyra, as they were once extant. Following the trauma caused by the destruction of Palmyra, these reconstructions revive in our memory the splendour of the city in the Greco-Roman Period.
Uploads
Papers by Ahmet Denker