Linquan(Jeffery) Chen

• Developed a simple Android game with the music and history record named 2048 from scratch.
• Implemented gesture recognition simply and used SharedPreferences to store data.
• Skills: Java, Android, UI Design, Testing.

• Designed and implemented a FUSE based filesystem which integrates solid state devices (SSDs) and Cloud storage services (Amazon S3, etc.)
• Support size based data placement: small data objects are placed on the SSD and large data objects are placed on the Cloud
• Support block level deduplication: divide data objectss into segments using Rabin fingerprinting. The segments will be deduplicated before being stored to cloud.
• Support snapshots: user can create, delete and restore… Show more

• Designed and implemented a FUSE based filesystem which integrates solid state devices (SSDs) and Cloud storage services (Amazon S3, etc.)
• Support size based data placement: small data objects are placed on the SSD and large data objects are placed on the Cloud
• Support block level deduplication: divide data objectss into segments using Rabin fingerprinting. The segments will be deduplicated before being stored to cloud.
• Support snapshots: user can create, delete and restore snapshots of CloudFS. Snapshots are also deduplicated. Show less

• Implemented PAXOS protocol on RPC-based backend storage servers to ensure distributed consensus, and tolerate up to half server failures, and created a simple game application based on PAXOS.
• Used heart beat to detect node failure, and launches a replacement node which automatically recovers data from other nodes.

• Designed and implemented a flash translation layer (FTL) for an emulated solid state drive (SSD)
• Support address translation with logging: translate LBA to PBA with the help of log-reservation block
• Support garbage collection: perform cleaning if a log-reservation block is full to reclaim space
• Support wear leveling: wear all blocks as evenly as possible to extend lifetime of SSD

Set up KVM on five physical super computer. Launch different number of VMs with totally different resources allocated to each. Install Yarn on all these VMs and run self-implemented scheduler to schedule MPI and GPU jobs on that.

• Built a virtual machine-based cloud with Hadoop YARN deployed.
• Designed and implemented a YARN scheduler to perform heterogeneity-aware, placement preference-aware and hard/soft constraints-aware scheduling for MPI and GPU jobs.
• Designed a N-step… Show more

Set up KVM on five physical super computer. Launch different number of VMs with totally different resources allocated to each. Install Yarn on all these VMs and run self-implemented scheduler to schedule MPI and GPU jobs on that.

• Built a virtual machine-based cloud with Hadoop YARN deployed.
• Designed and implemented a YARN scheduler to perform heterogeneity-aware, placement preference-aware and hard/soft constraints-aware scheduling for MPI and GPU jobs.
• Designed a N-step search greedy algorithm to minimize average completion time of all jobs.
• Design test trace files used to define the applications that will be scheduled by YARN.
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A social application, focuses on notifying events based on client’s location and creating group chats only during the activities.
• Utilized Google Map API to calculate the distance between the event and client, also show the location map.
• Displayed large bitmaps efficiently through processing bitmaps off the UI thread and caching bitmaps.
• Created RESTful API and implemented web services for local(SQLite) and remote(AWS) use.
• Implemented a socket chat server to handler… Show more

A social application, focuses on notifying events based on client’s location and creating group chats only during the activities.
• Utilized Google Map API to calculate the distance between the event and client, also show the location map.
• Displayed large bitmaps efficiently through processing bitmaps off the UI thread and caching bitmaps.
• Created RESTful API and implemented web services for local(SQLite) and remote(AWS) use.
• Implemented a socket chat server to handler client requests and forward messages
• Demo: https://youtu.be/0cc3D6n9pi0 Show less

A Web Service for supporting high-throughput analytical queries on large twitter dataset.
• Implemented high throughput web service using AWS offerings including EC2, ELB and CloudWatch.
• Performed data extract, transform and load process on over 1TB dataset using MapReduce.
• Conducted MySQL and HBase schema design and performance tuning, achieved top 5% performance.

• Designed interfaces between frontend and backend based on requirements.
• Implemented backend functions including Subscription, Friends, Tag, etc. with Play Framework.
• Code is being merged into Apache Code Base.
• URL: http://einstein.sv.cmu.edu:9041

A Web Application with front-end and back-end, to find your inner passion for learning, and assist you in finding your future career.
• Designed and implemented a RESTful API using java Servlet and developed a responsive web UI using Bootstrap and jQuery.
• Built a visible tree-like system to represent the relationship between courses and possible careers.
• Utilized APIs such as IBM BlueMix and Backand to handle the backend services, Course Hero to deal with course information.

• Developed a rotating display based on MCU F020 in C language, and with infrared remote control, electric machinery, two-color LED and so on.
• Implemented an adaptive display algorithm, which made the display time match the changeable rotational speed.

• Simulated for plasmonic light-emission enhancement with metal nanoparticles by FDTD.
• Designed metal nanostructures based on Si and got 12-fold enhancement of light emitting in the near-infrared.