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Search Results: 1 - 10 of 327 matches for " Siamak Ardekani "
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The Relation between Freeway Average Speed and Speed Noise  [PDF]
Bahar Zarin, Siamak Ardekani
Journal of Transportation Technologies (JTTs) , 2015, DOI: 10.4236/jtts.2015.52009

Many factors affect the vehicular fuel consumption rate. The most significant traffic-related ones are speed, number of stops, speed noise, and acceleration noise (acceleration standard deviation). Fuel consumption models for both urban and highway traffic are used to evaluate the effect of these factors. Previous literature shows the speed and the acceleration of vehicles as well as the aerodynamic effects are the most commonly used variables in the highway fuel consumption mo dels. However, most existing models are based on the average or cruising speed and the effect of speed variation is by-and-large ignored. Incorporating the speed noise as a variable in the prediction models seems impractical because measuring it is cumbersome. However, knowing the relation between speed and speed noise may allow including the effect of speed noise in the model indirectly. To that end, this study examines the relation between speed and speed noise. The resulting mathematical relation is used to incorporate the speed noise effects in the fuel consumption model.

A Statistical Comparison of Traffic Measurements from the Moving versus Stationary Observer Methods  [PDF]
Fadi Alhomaidat, Siamak Ardekani
Journal of Transportation Technologies (JTTs) , 2015, DOI: 10.4236/jtts.2015.54019
Abstract: Data of traffic flow, speed and density are required for planning, designing, and modelling of traffic stream for all parts of the road system. Specialized equipments such as stationary counts are used to record volume and speed; but they are expensive, difficult to set up, and require periodic maintenance. The moving observer method was proposed in 1954 by Wardrop and Charlesworth to estimate these variables inexpensively. Basically, the observer counts the number of vehicles overtaken, the number of vehicles passed, and the number of vehicles encountered while traveling in the opposite direction. The trip time is reported for both travel directions. Additionally, the length of road segment is measured. These variables are then used in estimating speeds and volumes. In a westbound direction from Interstate Highway 30 (I-30) in the DFW area, this study examined the accuracy and feasibility of this method by comparing it with stationary observer method as the standard method for such counts. The statistical tests were used to test the accuracy. Results show that this method provides accurate volume and speed estimates when compared to the stationary method for the road segment with three lanes per direction, especially when several runs are taken.
A New Paradigm in User Equilibrium-Application in Managed Lane Pricing
Asapol Sinprasertkool, Siamak Ardekani, Stephen P. Mattingly
International Journal of Engineering , 2011,
Abstract: Ineffective use of the High-Occupancy-Vehicle (HOV) lanes has the potential to decrease theoverall roadway throughput during peak periods. Excess capacity in HOV lanes during peakperiods can be made available to other types of vehicles, including single occupancy vehicles(SOV) for a price (toll). Such dual use lanes are known as “Managed Lanes.” The main purposeof this research is to propose a new paradigm in user equilibrium to predict the travel demand fordetermining the optimal fare policy for managed lane facilities. Depending on their value of time,motorists may choose to travel on Managed Lanes (ML) or General Purpose Lanes (GPL). In thisstudy, the features in the software called Toll Pricing Modeler version 4.3 (TPM-4.3) aredescribed. TPM-4.3 is developed based on this new user equilibrium concept and utilizes it toexamine various operating scenarios. The software has two built-in operating objective options: 1)what would the ML operating speed be for a specified SOV toll, or 2) what should the SOV toll befor a desired minimum ML operating speed.A number of pricing policy scenarios are developed and examined on the proposed managedlane segment on Interstate 30 (I-30) in Grand Prairie, Texas. The software provides quantitativeestimates of various factors including toll revenue, emissions and system performance such asperson movement and traffic speed on managed and general purpose lanes. Overall, among thescenarios examined, higher toll rates tend to generate higher toll revenues, reduce overall COand NOx emissions, and shift demand to general purpose lanes. On the other hand, HOVpreferential treatments at any given toll level tend to reduce toll revenue, have no impact on orreduce system performance on managed lanes, and increase CO and NOx emissions.
Evolutions and Future Directions of Surgical Robotics: A Review  [PDF]
Siamak Najarian, Elnaz Afshari
International Journal of Clinical Medicine (IJCM) , 2012, DOI: 10.4236/ijcm.2012.32017
Abstract: Although the robotics firstly appeared as an entertainment form, its capabilities have continuously advanced from the world’s first industrial robot to the surgical robotic systems which are today capable of performing many surgical maneuvers unaided. However, these surgical robots are not autonomous systems; they are designed to complete a surgeon’s abilities and converting surgeon’s movements into incredibly steady and accurate robotic movements that finally manipulate surgical instruments to assist delicate operations. This novel type of surgery is carried out in the form of minimally invasive surgical procedure and has offered valuable alternatives to enhance traditional open surgery approach. Although the surgical robotic systems began as external robots, technological progresses are directing the surgical robotic systems to endoluminal robots which consist of doing surgical maneuvers by navigating of robot through lumens of human body. Here, we will briefly review different applications of robotic systems in various fields of medicine. Then, we will discuss minimally invasive surgical systems and their role in progressing of minimally invasive surgery as a modern surgery method. By thoroughly investigating a considerable amount of published materials about the minimally invasive surgical technologies, we will study the recent research activities and commercially available samples of surgical robotic systems.
The Effect of Tool Construction and Cutting Parameters on Surface Roughness and Vibration in Turning of AISI 1045 Steel Using Taguchi Method  [PDF]
Rogov Vladimir Aleksandrovich, Ghorbani Siamak
Modern Mechanical Engineering (MME) , 2014, DOI: 10.4236/mme.2014.41002

This paper presents an experimental investigation focused on identifying the effects of cutting conditions and tool construction on the surface roughness and natural frequency in turning of AISI1045 steel. Machining experiments were carried out at the lathe using carbide cutting insert coated with TiC and two forms of cutting tools made of AISI 5140 steel. Three levels for spindle speed, depth of cut, feed rate and tool overhang were chosen as cutting variables. The Taguchi method L9 orthogonal array was applied to design of experiment. By the help of signal-to-noise ratio and analysis of variance, it was concluded that spindle speed has the significant effect on the surface roughness, while tool overhang is the dominant factor affecting natural frequency for both cutting tools. In addition, the optimum cutting conditions for surface roughness and natural frequency were found at different levels. Finally, confirmation experiments were conducted to verify the effectiveness and efficiency of the Taguchi method in optimizing the cutting parameters for surface roughness and natural frequency.

Topical immunotherapy with diphenylcyclopropenone in vitiligo: A preliminary experience
Aghaei Shahin,Ardekani Gholamreza
Indian Journal of Dermatology, Venereology and Leprology , 2008,
Abstract: Background: Despite recent significant therapeutic advances, vitiligo remains a clinical conundrum. Topical immunotherapy has been extensively tested in the treatment of various dermatologic disorders, especially those believed to have an immunologic basis. Aim: To evaluate the role of topical diphenylcyclopropenone (DPCP) in the treatment of vitiligo. Methods: Nineteen patients with limited vitiligo lesions were enrolled in this study. After sensitization with 2% lotion of DPCP in acetone, progressively higher concentrations beginning at 0.001% up to 2% were applied weekly for 6 months to the depigmented skin lesions. Results: Thirteen of the 19 patients were evaluated at the end of 6 months. Four patients with focal vitiligo, one patient with vitiligo vulgaris, and three patients with segmental vitiligo showed marked (grade 3) repigmentation. Conclusion: Marginal and central repigmentation with hyperpigmented borders was seen in the majority of lesions. Further controlled trials should be undertaken to evaluate the use of topical DPCP in vitiligo.
Genetic Technologies and Ethics
Ali M. Ardekani
Journal of Medical Ethics and History of Medicine , 2009,
Abstract: In the past decade, the human genome has been completely sequenced and the knowledge from it has begun to influence the fields of biological and social sciences in fundamental ways. Identification of about 25000 genes in the human genome is expected to create great benefits in diagnosis and treatment of diseases in the coming years. However, Genetic technologies have also created many interesting and difficult ethical issues which can affect the human societies now and in the future. Application of genetic technologies in the areas of stem cells, cloning, gene therapy, genetic manipulation, gene selection, sex selection and preimplantation diagnosis has created a great potential for the human race to influence and change human life on earth as we know it today. Therefore, it is important for leaders of societies in the modern world to pay attention to the advances in genetic technologies and prepare themselves and those institutions under their command to face the challenges which these new technologies induce in the areas of ethics, law and social policies.
Presentation Conceptual Framework Acquiring International Liability in Not-Prohibited Actions in Conflicts Law by Investigation Thematic Sea Battleship
Saeed D. Ardekani
International Journal of Nations Research , 2018, DOI: -
Abstract: Acquiring responsibility in international and domestic conflicts, always has encountered with obstacles. In these conflicts we face with action and non-actions that not prohibited from the perspective of international rights and do not have the nature of the offending action. But just committing them, causes imposition extensive damage to the sides of the conflict and even third parties. The question you can do here is: why not pay attention and the success of governments and international organizations that's important. International peace and security it has always been impressed internal and international conflicts. Lack of all-inclusive definition of responsibility in internal and international conflicts, faces global equations of peace with vague variables. Acquiring responsibility in international non-prohibited acts in the rights of hostilities, by defining and identifying new weapons and its degradation range in various human and environmental spheres and ultimately their application it will be possible in the form of conventions and international treaties in the conflicts' rights. In this regard, revision and correction Lahe's agreement, Geneva conventions of 1949 and 1977 protocols, is necessary and essential. Sea battleship as the most comprehensive war in the past and most likely in the future, has always been accompanied by international implications and has provided incentives international responsibility of the parties to the conflict. A war with the advancement of technology and sea weapons, will have extensive human implications and environmental.
Weaponization of the body and politicization of death
Movahedi, Siamak;
Revista Latinoamericana de Psicopatologia Fundamental , 2009, DOI: 10.1590/S1415-47142009000100006
Abstract: the paper examines the psychology of martyrdom through the analysis of death speeches, the final letters, wills, and testaments left behind by men in the middle east who undertook suicidal missions in war. the author maintains that the human body is as much a social object as it is a biological entity, and death is as much a social event as it is a physical happening. the biologically living body may be symbolically dead, and the physically dead person may be more powerful than the living. a communication that a person makes while he or she is anticipating an impending death is an overloaded message, comparable to the first or the last dream in psychoanalysis. it may provide important clues not only to the person's immediate psychic experience, but also to one's characteristic mode of encounter with the object world. final letters, near-death or suicide notes have a particularly demanding, commanding, and pleading quality. the author finds several modes of communication and metacommunication in the notes: disengaged, abstract, and intimate, each differently conveying their thoughts, fantasies, and relatedness to the world, god, justice, vengeance, death, immortality, loved ones, and enemies.
Adenomatous Polyp of the Verumontanum Causing Bladder Outlet Obstruction
Siamak Daneshmand
The Scientific World Journal , 2004, DOI: 10.1100/tsw.2004.51
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