Molecular Signal Modeling of a Partially Counting Absorbing Spherical Receiver

To communicate at the nanoscale, researchers have proposed molecular communication as an energy-efficient solution. The drawback to this solution is that the histogram of the molecules' hitting times, which constitute the molecular signal at the receiver, has a heavy tail. Reducing the effects of this heavy tail, inter-symbol interference (ISI), has been the focus of most prior research. In this paper, a novel way of decreasing the ISI by defining a counting region on the spherical receiver's surface facing towards the transmitter node is proposed. The beneficial effect comes from the fact that the molecules received from the back lobe of the receiver are more likely to be coming through longer paths that contribute to ISI. In order to justify this idea, the joint distribution of the arrival molecules with respect to angle and time is derived. Using this distribution, the channel model function is approximated for the proposed system, i.e., the partially counting absorbing spherical receiver. After validating the channel model function, the characteristics of the molecular signal are investigated and improved performance is presented. Moreover, the optimal counting region in terms of bit error rate is found analytically.Comment: submitted to Transactions on Communication

Analytical Derivation of the Impulse Response for the Bounded 2-D Diffusion Channel

This paper focuses on the derivation of the distribution of diffused particles absorbed by an agent in a bounded environment. In particular, we analogously consider to derive the impulse response of a molecular communication channel in 2-D and 3-D environment. In 2-D, the channel involves a point transmitter that releases molecules to a circular absorbing receiver that absorbs incoming molecules in an environment surrounded by a circular reflecting boundary. Considering this setup, the joint distribution of the molecules on the circular absorbing receiver with respect to time and angle is derived. Using this distribution, the channel characteristics are examined. Furthermore, we also extend this channel model to 3-D using a cylindrical receiver and investigate the channel properties. We also propose how to obtain an analytical solution for the unbounded 2-D channel from our derived solutions, as no analytical derivation for this channel is present in the literature.Comment: 13 pages and 5 figure

Hubungan antara tahap kompetensi dengan tahap prestasi kerja di kalangan pentadbir Kolej Universiti Teknologi Tun Hussein Onn (KUiTTHO)

This research is a case research in studying the connection of competency level with the administrator in Kolej University Teknologi Tun Hussein Onn (KUiTTHO). Research was done on 40 respondents which were identified playing an important role in giving the feedback. All the respondents are a public service officer from the management and professional group in KUiTTHO, Batu Pahat, Johor. Results from the research are gathered using the Statistical Package for Social Sciences (SPSS version 13.0) software. Model for the Managers Competency and KUiTTHO Annual Assessment Report Form are the main components in the establishing the research framework. As for the independent variable, competencies are divided into four clusters which is personal management, group management, working management and collaborative management. While the dependent variable which is job performance is divided into three dimensions which are working result, knowledge and ability and personal quality. Throughout the research the result shows that the competency level and job performance level for the KUiTTHO administrator are at the highest level. Based on Pearson correlation analysis, research result shows that the positive relationship exists is at the average level. However, competency levels are still playing a huge role in increasing the level of the administrator job performance in KUiTTHO

A General Analytical Approximation to Impulse Response of 3-D Microfluidic Channels in Molecular Communication

In this paper, the impulse response for a 3-D microfluidic channel in the presence of Poiseuille flow is obtained by solving the diffusion equation in radial coordinates. Using the radial distribution, the axial distribution is then approximated accordingly. Since Poiseuille flow velocity changes with radial position, molecules have different axial properties for different radial distributions. We, therefore, present a piecewise function for the axial distribution of the molecules in the channel considering this radial distribution. Finally, we lay evidence for our theoretical derivations for impulse response of the microfluidic channel and radial distribution of molecules through comparing them using various Monte Carlo simulations.Comment: The manuscript is submitted to IEEE: Transactions on Nanobioscienc