This paper presents the Agent pattern, a design pattern useful to develop dynamic and distributed... more This paper presents the Agent pattern, a design pattern useful to develop dynamic and distributed applications. The Agent pattern provides a clean and easy way to develop agent-based applications, mainly in open and large-scale distributed environments such as the ...
This paper gives an overall overview of the AgentSpace framework, a next-generation Java mobile a... more This paper gives an overall overview of the AgentSpace framework, a next-generation Java mobile agent system developed on top of the ObjectSpace Voyager system. We first introduce the notion of dynamic and distributed agent-based applications and argue that the AgentSpace features are suitable to support them. The AgentSpace novelties include: flexible and dynamic association between agents, security policies and users; transparency of agent location through the use of views; and easy and clean way to create agents through the use of abstract classes and method factories.
In this paper we continue arguing that persistence is a fundamental requirement to support the de... more In this paper we continue arguing that persistence is a fundamental requirement to support the development of next-generation agent-based applications. After a general overview of mobility and persistence to clarify the main issues discussed in the paper, we propose a tentative list of facilities that should be supported by persistent mobile agent systems. The main contribution of the paper is a survey of existing persistent and mobile agent systems that includes a comparison based on how well (or badly) they support the proposed list of facilities.
This paper gives an overall overview of the AgentSpace framework, a next-generation Java mobile a... more This paper gives an overall overview of the AgentSpace framework, a next-generation Java mobile agent system developed on top of the ObjectSpace Voyager system. We first introduce the notion of dynamic and distributed agent-based applications and argue that the AgentSpace features are suitable to support them. The AgentSpace novelties include: flexible and dynamic association between agents, security policies and users; transparency of agent location through the use of views; and easy and clean way to create agents through the use of abstract classes and method factories.
In this paper we continue arguing that persistence is a fundamental requirement to support the de... more In this paper we continue arguing that persistence is a fundamental requirement to support the development of next-generation agent-based applications. After a general overview of mobility and persistence to clarify the main issues discussed in the paper, we propose a tentative list of facilities that should be supported by persistent mobile agent systems. The main contribution of the paper is a survey of existing persistent and mobile agent systems that includes a comparison based on how well (or badly) they support the proposed list of facilities.
Carotid body tumors (CBTs) have an unpredictable history with no correlation between histology an... more Carotid body tumors (CBTs) have an unpredictable history with no correlation between histology and clinical behavior. Of reported cases since 1891, local and distant metastases appear in approximately 10% of cases and remain the hallmark of malignancy. Currently, there are not enough data to support a single treatment regimen for malignant CBTs. The reported case demonstrates some unanswered issues with regard to malignant CBTs to include lymph node dissection, the need for carotid resection, and the role of radiation therapy. A 46-year-old pathologist underwent a resection of a Shamblin I CBT, to include jugular lymph node sampling, without complication. There was lymph node involvement, and tumor cells were found on the margins of the pathologic specimen. Subsequent carotid resection with reversed interposition saphenous vein graft and modified neck dissection were performed again without complication. Follow-up at 4 years has been uneventful. Diagnosis of CBTs with the use of magnetic resonance angiography, magnetic resonance imaging, color flow duplex scanning, and the role of arteriography are reviewed. The current treatment options are discussed with reference to primary lymph node sampling, carotid resection, and neck dissection in malignant cases. This case demonstrates that the unpredictable nature of CBTs and their malignant potential warrant aggressive initial local treatment to include jugular lymph node sampling and complete tumor resection. (J Vasc Surg 2000;32:821-3.)
A systematic study of the chemical and physical changes induced by exposure to UV (248 nm) excime... more A systematic study of the chemical and physical changes induced by exposure to UV (248 nm) excimer laser light of unvarnished tempera paint samples has been undertaken as a part of the research activities included in the European project “Advanced workstation for controlled laser cleaning of artworks”. The direct exposure of the paint to the UV laser configures the worst case scenario of laser cleaning, as a thin protective layer of varnish is normally left to minimize the dose of UV radiation that reaches the paint surface. However, in the practice of laser cleaning, there is a need to characterize and quantify the possible effects of direct UV laser irradiation of unvarnished paints. To this purpose, a broad range of techniques have been used including profilometry, colorimetry, optical and vibrational spectroscopic techniques, such as laser-induced fluorescence (LIF), laser-induced breakdown spectroscopy (LIBS), Fourier transform Raman (FTR) and infrared (FTIR), and analytical mass spectrometric techniques, like direct-temperature-resolved mass spectrometry (DTMS) and laser desorption and ionization time of flight mass spectrometry (LDI-TOF). Integration of the results obtained by these techniques allowed the investigation of the nature and degree of change of the irradiated paint systems. These were observed to strongly depend on the type of paint system.
This paper presents the Agent pattern, a design pattern useful to develop dynamic and distributed... more This paper presents the Agent pattern, a design pattern useful to develop dynamic and distributed applications. The Agent pattern provides a clean and easy way to develop agent-based applications, mainly in open and large-scale distributed environments such as the ...
This paper gives an overall overview of the AgentSpace framework, a next-generation Java mobile a... more This paper gives an overall overview of the AgentSpace framework, a next-generation Java mobile agent system developed on top of the ObjectSpace Voyager system. We first introduce the notion of dynamic and distributed agent-based applications and argue that the AgentSpace features are suitable to support them. The AgentSpace novelties include: flexible and dynamic association between agents, security policies and users; transparency of agent location through the use of views; and easy and clean way to create agents through the use of abstract classes and method factories.
In this paper we continue arguing that persistence is a fundamental requirement to support the de... more In this paper we continue arguing that persistence is a fundamental requirement to support the development of next-generation agent-based applications. After a general overview of mobility and persistence to clarify the main issues discussed in the paper, we propose a tentative list of facilities that should be supported by persistent mobile agent systems. The main contribution of the paper is a survey of existing persistent and mobile agent systems that includes a comparison based on how well (or badly) they support the proposed list of facilities.
This paper gives an overall overview of the AgentSpace framework, a next-generation Java mobile a... more This paper gives an overall overview of the AgentSpace framework, a next-generation Java mobile agent system developed on top of the ObjectSpace Voyager system. We first introduce the notion of dynamic and distributed agent-based applications and argue that the AgentSpace features are suitable to support them. The AgentSpace novelties include: flexible and dynamic association between agents, security policies and users; transparency of agent location through the use of views; and easy and clean way to create agents through the use of abstract classes and method factories.
In this paper we continue arguing that persistence is a fundamental requirement to support the de... more In this paper we continue arguing that persistence is a fundamental requirement to support the development of next-generation agent-based applications. After a general overview of mobility and persistence to clarify the main issues discussed in the paper, we propose a tentative list of facilities that should be supported by persistent mobile agent systems. The main contribution of the paper is a survey of existing persistent and mobile agent systems that includes a comparison based on how well (or badly) they support the proposed list of facilities.
Carotid body tumors (CBTs) have an unpredictable history with no correlation between histology an... more Carotid body tumors (CBTs) have an unpredictable history with no correlation between histology and clinical behavior. Of reported cases since 1891, local and distant metastases appear in approximately 10% of cases and remain the hallmark of malignancy. Currently, there are not enough data to support a single treatment regimen for malignant CBTs. The reported case demonstrates some unanswered issues with regard to malignant CBTs to include lymph node dissection, the need for carotid resection, and the role of radiation therapy. A 46-year-old pathologist underwent a resection of a Shamblin I CBT, to include jugular lymph node sampling, without complication. There was lymph node involvement, and tumor cells were found on the margins of the pathologic specimen. Subsequent carotid resection with reversed interposition saphenous vein graft and modified neck dissection were performed again without complication. Follow-up at 4 years has been uneventful. Diagnosis of CBTs with the use of magnetic resonance angiography, magnetic resonance imaging, color flow duplex scanning, and the role of arteriography are reviewed. The current treatment options are discussed with reference to primary lymph node sampling, carotid resection, and neck dissection in malignant cases. This case demonstrates that the unpredictable nature of CBTs and their malignant potential warrant aggressive initial local treatment to include jugular lymph node sampling and complete tumor resection. (J Vasc Surg 2000;32:821-3.)
A systematic study of the chemical and physical changes induced by exposure to UV (248 nm) excime... more A systematic study of the chemical and physical changes induced by exposure to UV (248 nm) excimer laser light of unvarnished tempera paint samples has been undertaken as a part of the research activities included in the European project “Advanced workstation for controlled laser cleaning of artworks”. The direct exposure of the paint to the UV laser configures the worst case scenario of laser cleaning, as a thin protective layer of varnish is normally left to minimize the dose of UV radiation that reaches the paint surface. However, in the practice of laser cleaning, there is a need to characterize and quantify the possible effects of direct UV laser irradiation of unvarnished paints. To this purpose, a broad range of techniques have been used including profilometry, colorimetry, optical and vibrational spectroscopic techniques, such as laser-induced fluorescence (LIF), laser-induced breakdown spectroscopy (LIBS), Fourier transform Raman (FTR) and infrared (FTIR), and analytical mass spectrometric techniques, like direct-temperature-resolved mass spectrometry (DTMS) and laser desorption and ionization time of flight mass spectrometry (LDI-TOF). Integration of the results obtained by these techniques allowed the investigation of the nature and degree of change of the irradiated paint systems. These were observed to strongly depend on the type of paint system.
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Papers by Alberto Silva