publications

2025

1. Samsung

   Pangaea: CXL-based Disaggregated System Architecture for Cloud-Native Orchestration

   Han Deok Lee al.

   2025

   Grand Prize

   Han Deok Lee receved the Grand Prize in DRAM Development Department Paper Awards 2025 for his services to Theoretical Physics, and especially for his discovery of the law of the photoelectric effect

2012

1. Samsung SBPA

   ESR: Software architecture for NAND flash storage with an AP-side vertical optimization approach

   Han Deok Lee al.

   2012

   Bronze Prize

   Han Deok Lee receved the Bronze Prize in Samsung Best Paper Awards 2012 for his services to Theoretical Physics, and especially for his discovery of the law of the photoelectric effect

2006

1. ACM VLDB

   LGeDBMS: A Small DBMS for Embedded System with Flash Memory

   Proceedings of the 32nd International Conference on Very Large Data Bases, Seoul, Sep 2006

   Abs PDF

   The ever-increasing requirement of high performance and huge capacity memories of emerging consumer electronics appliances, such as mobile phone, digital camera, MP3, PMP, PDA, etc., has led to the widespread adaptation of flash memory as main data storages, respectively. As a result, managing the data on flash memory has been gaining in significant to satisfy the requirement of mobile embedded applications. However, the read/write/erase behaviors of flash memory are radically different than that of magnetic disks which make traditional database technology irrelevant. In this paper, we introduce LGeDBMS, a scale-downed DBMS engine designed for flash memory and its application. Finally, we demonstrate a PIM(Personal Information Management) application on a mobile phone using LGeDBMS.

2004

1. IEEE MSST

   Regulating I/O Performance of Shared Storage with a Control Theoretical Approach

   21st IEEE Conference on Mass Storage Systems and Technologies / 12th NASA Goddard Conference on Mass Storage Systems and Technologies, Maryland, Apr 2004

   Abs PDF

   Shared storage has become commonplace with recent trends in storage technologies, such as storage consolidation and virtualization, etc. Meanwhile, storage QoS, which guarantees different storage service requirements from various applications toward shared storage, is gaining in importance. This paper proposes a new scheme which combines a feedback-controlled leaky bucket with a fair queuing algorithm in order to deliver guaranteed storage service for applications competing for shared storage. It not only assures an agreed-upon response time for each application, but also maximizes the aggregate I/O throughput by proportionating unused bandwidth to other active applications. Simulation results under various types of competing I/O workloads validate the features of the proposed scheme.