|Some Projects of Nikolai Joukov|
|OS profiling via latency aggregation (OSprof aka FSprof)|
Modern Operating Systems consist of a number of components that despite having different purposes strongly
influence each other. Unfortunately, existing OS profiling systems concentrate on some particular OS component
or profile only CPU or I/O activity. Therefore, the information collected is often not sufficient to discover
and easily understand possible OS performance problems. In this project we investigate techniques that allow
to capture, visualize, and analyze statistical information about the OS operation as a whole, as well as
several OSs that communicate over the network.|
Figure on the left shows a lock contention between READ and LLSEEK (original and patched) file system operations described on linux-fsdevel mailing list.
|Automatic File Systems Generation and Instrumentation (FoSgen)|
|FoSgen is an automatic file system generator.
It can instrument existing and even future
file systems with OS-independent extensions written in
Our current prototype can add many different extensions to Linux 2.4, Linux 2.6, and FreeBSD 5.4 file systems.
Example FiST extensions are: printkfs, FSprof, trash bin, and secure deletion.
|Redundant Array of Independent Filesystems (RAIF)|
|Redundant Array of Independent Filesystems is a RAID-like stackable fan-out filesystem that can be mounted over a set of other filesystems. There are currently 6 RAIF levels that correspond to 6 standard RAID levels. RAIF offers unprecedented configuration flexibility: RAIF levels can be configured on the per-file basis, lower branches can be any filesystems (Disk, Network, or memory-based).|
|ReplayFS is the first tool to replay traces at the VFS level. The traces are captured by the TraceFS filesystem. Both TraceFS and ReplayFS are implemented as a thin stackable layer between VFS and a lower filesystem. VFS level replaying offers better reproducibility of the filesystem behavior and allows replaying of mmap-related filesystem operations.|
|Kernel Code Electric Fence (Kefence)|
|ElectricFence library for the Linux kernel.|
|Yuntis search engine evaluation|
(Based on Kendall tau and precision-recall metrics)
|Lectern is the first electronic lecture recording system that provides extensive on-line navigational support for classroom instruction with minimal intrusion to the lecturing activity.
It transparently captures the digital pen inks and the voice inputs in real time, and synchronizes them with the pre-prepared slides using Synchronized Multimedia Integration Language.
At the end, with one key press, the entire lecture recording is converted into a Web-ready format, sent to a pre-designated Web server with a proper anchor link added, and available for download and/or streaming access.
The standard set-up of a Lectern system consists of a tablet PC and a video projector: An instructor uses the tablet PC to show pre-prepared slides and annotate them in the same way as she does on a piece of paper, and the tablet PCs display is projected on the video projector for the live audience.
After a lecture is completed, the instructor can use Lecterns editor to edit the lecture recording by either deleting existing slides and their associated digital inks and voice inputs, or inserting additional slides or annotations.
The lecture recordings from Lectern are designed to be viewed by the freely available Real Player.|
The playback bandwidth requirements are very modest (~20KBit) therefore the lectures can be played back even via a modest modem link.
Example recordings are available on cse320 and lectern servers.
|Quantum Computing Library|
|Created a library of very low current-dencity Josephson junctions for TRW and HYPRES fabrication technologies and test layouts of quantum computing elements. One such microchip is shown on the left side.|
|RSFQ Serial multiplier|
|Proposed innovative timing approach to the standard implementation of a serial RSFQ accumulator.
30% speedup and 30% hardware savings were achieved.|
Accumulator implemented for Hypres technology as a part of serial multiplier is shown on the left.
|Internet Service Management Device (ISMD)|
|Cadence customization for RSFQ technology|
(PCELLs are based on ROD SKILL functions. Josephson Junction PCELL is shown on the left)
More information is available at: rsfq1.physics.sunysb.edu/RSFQ/cadence/
|Linux KQUEUE prototype|
|Kqueue event notification API is implemented for Linux
in the form of a loadable kernel module. Existing BSD applications
that use kqueue API were ported to Linux and proved the correct
implementation functionality. Event requests are preserved in the
kernel and thus improvement for long-living connections over
standard poll mechanism was achieved. Detailed survey of existing event
notification mechanisms is presented. A set of a simple kernel
changes is proposed in order to enhance kernel extendibility.
A scheme of a very low latency light weighted high scalability
notification mechanism based on the extended kernel variant is proposed.|
Read complete report
Download source code (warning: alpha version)
|www.auto-parts.ru - Russia-wide autoparts search engine|
|Russian auto parts search engine.|
Server provided authentification and auto updates by subscribers.
A number of heuristics were implemented in order to find right parts substitutions.
|Design of Web site and logo for Aibolit Auto and V.I.P. Limousine companies|
"Old doctor with a wrench"
|Superconducting Microstrip Lines Digital Interface|
|Comprehensive study of the superconductive Microstrip Lines (MSL) usage in RSFQ technology.
Figure on the left shows a test microchip fabricated in Hypres Inc. with three schemes to test bit error rate and bias current margins of the proposed MSL interfaces.
References to three publications about this project can be found on my publications page
|Cadence layouts viewer|
|LayView is a Cadence layouts viewer for Linux. This program generates previews of Cadence layouts for people who do not have access to Cadence or want to get an idea about a layout contents without starting Cadence|
|RSFQ digital correlator|
|RSFQ-based Sign Correlator was simulated and laid out for IREE Russian Academy of Sciences (RAS) and PTB (Germany) fabrication technologies. New Josephson Junctions library for IREE RAS technology was designed as a part of the project.|
|Atomic Physics Practicum I2 Spectrum Analyzer|
|This program was written for the General Atomic Physics Practicum Laboratory, Physics dept. of Moscow State University.
The program visualizes and analyses I2 spectrum data collected by students.
|VSM Workshop - Vibrating Sample Magnetometer Data Analyzer|
|Program used for analysis of experimental data generated by Vibrating Sample Magnetometer (VSM) in Kern forschungszentrum Karlsruhe (FZK, former KFK), Germany
Main program features include
|Matches - logical game - my first windows program|
|My first Windows program written during Windows 3.11 era: A logical game that I like in real life.
It seems to be very simple but you are very likely to lose :-) Download and try to win!
|QUEST - low level DOS framework for strategic games|
|A set of DOS drivers and utilities for strategic games development:
|go back to home page of Nikolai Joukov|