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The utility of source code, as of other knowledge artifacts, is predicated on the existence of individuals skilled enough to derive value by using or improving it. Developers leaving a software project deprive the project of the knowledge of the decisions they have made. Previous research shows that the survivors and newcomers maintaining abandoned code have reduced productivity and are more likely...
Load balancing in a switch-fabric type of torus optical packet switching data center networks with hybrid optoelectronic routers shows the performance improvement such as packet dropping probability by decreasing the average number of hops.
Aiming at product information management in modern enterprise, the warehouse management system in this paper uses the J2EE architecture and is based on B/S mode. It uses SSH, the more popular integrated open-source framework in web application, improves the security and reliability of the system. This paper mainly introduces architecture and database design of the system. The design of user permissions...
In OPS-based data center networks, setting up temporal OCS paths for high-reliability-required large data transmissions is preferred. However, inappropriate OCS path selection could severely affect the original OPS traffic, which is because OCS path may break the network topology and cause OPS packet circulations. We propose to hold bypassing routes for every link of the OCS path when it is established...
We present an energy-efficient, low-latency, torus-topology intra-datacenter network with the deployment of 100-Gb/s hybrid optoelectronic routers, where OPS, OCS and virtual OCS are all supported on a single hardware platform enabled by smart flow management.
A firefly algorithm (FA) based parameter optimization method for extreme learning machine (ELM) for hyperspectral image classification is proposed. The parameters of regularization coefficient and Gaussian kernel are optimized by firefly algorithm in this method. The experimental results show that the FA-based optimization algorithm can provide the better performance of extreme learning machines for...
The quality of software projects is affected by developer turnover. Mockus studied organizational volatility in the context a large switching software project at Avaya. We replicate his model of the impact of organizational volatility on post-release defects. At the time of Mockus's study, Avaya was experimenting with outsourcing and layoffs were prevalent. In contrast, we study volatility on the...
This paper proposes a novel virtual optical circuit switching (VOCS) scheme for data center networks where short flows are transmitted via optical packet switching (OPS), while long flows with reliability requirement are transmitted via VOCS. VOCS preserves the advantage of optical circuit switching (OCS) for reliable communication, while it overcomes the disadvantage of OCS in terms of low link utilization...
Mode division multiplexing (MDM) over wavelength division multiplexing (WDM) network is studied, particularly focusing on low differential mode group delay (DMGD) two-mode fiber (TMF) link in a wide spectral range. Here, the DMGD is defined as the group delay between the two guided modes, LP01 and LP11 modes. For the starter, We will revisit an invention of the original TMF in late 70's, followed...
We review recent development of energy-efficient, low-latency intra-data center network, emphasizing on intelligent flow control capability, which simultaneously supports both OPS and OCS on-demand on a 100-Gbps (25-Gbps × 4-wavelength) platform consisting of hybrid optoelectronic packet routers.
Modeling and performance analysis of optical packet switching (OPS) data center networks (DCN) with flow management is presented. Hybrid optoelectronic packet routers (HOPR) are introduced in the data center network, which combines optical switching fabric and electronic buffers with 100 Gbit/s (25 Gbit/s × 4 wavelengths) links. A novel “Express Path”, an instant wavelength path on demand, is proposed...
We consider an integrated service system, where real-time (RT) calls of multiple rate requirements and non-real-time (NRT) calls share the total system capacity. Typically, RT calls are given strict priority over NRT calls, therefore, NRT performance is dependent on the RT process. When RT call arrival processes are not Poisson processes, the effect of the RT traffic burstiness on the NRT performance...
For integrated service systems supporting real-time (RT) and non-real-time (NRT) traffic, evaluating the performance of the NRT traffic is often challenging. An approximation based on a fluid model - the so-called Fluid Approximation (FA) - can be used when RT traffic has much larger successful call arrival rate than the NRT traffic, while otherwise it may introduce errors. In this paper, we propose...
Prior studies mostly focus on the outcomes of realized strategies in the strategic management literature. Very few of them examine how strategies are developed, what affects the firm's strategic orientation, and how strategic orientation affects firm's innovation performance. As key factor, top managers provide guidelines and directions for firm's pivotal strategy decisions. Despite the fact that...
This paper discusses the historical data real-time database system, and the detailed process of processing technique to realize the historical database disk. Due to the limited space available, based on the detailed historical database disk problems such as structure are not discussed. The historical data processing is one of the important aspects for real-time database. At present, this area has...
This paper considers a two-tier femto-macro overlay network architecture, where groups of femtocells are overlaid by macrocells. The capacity of the femtocells is limited, thus redirection of blocked femto calls to the overlaid macrocell is used as a QoS assurance strategy. Similar overflow approaches have been used in telephony; however, extension of this approach to capacity-constrained femto-macro...
We demonstrate a new saturable absorber mirror coated with thin-film single-wall carbon nanotubes. Using such a device, we build a T-type ring cavity fiber laser and obtained pulses of 586 fs.
We report a simplified mode-locked Er fiber laser in normal dispersion with birefringence filters compared with the one with nonlinear polarization evolution mechanism.
The paper summarizes recent advances in Er and Yb doped mode locked fiber lasers with saturable absorbers such as semiconductor and carbon nanotube saturable absorbers.
We investigated linear-cavity with ultra-low repetition rate Erbium-doped fiber laser mode-locked by a high modulation depth SESAM. Output pulses were highly-chirped, at energy up to 14 nJ and minimum repetition rate was 25 kHz.
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