design and develop klaytn (blockchain platform)develop prototype for proof of conceptdefines the technical direction of project helps to identify risk areas and solve technical issue for the project

Data Platform Department Leader- manage several teams and architect and design data platform and data service- DMP (Data Management Platform) Team digital marketing / advertisement platform- BI Data Engineering Team BI Report, OLAP, Data Visualization- Big Data Infrastructure Team Hadoop, Spark, Kafka, HBase, Impala, Druid- Recommendation Service big data based recommendation service

Link Analysis - analyze link of web data - develop MapReduce / Spark program to analyze large scale web link data - develop web front using nodejs and D3.js to visualize result data.Hadoop / Hbase / Spark Tech Support - support hadoop / hbase / spark as code level - develop offline hbase to debug and manage large scale data - bug fix and improve hbase function (snapshot / merge / tableinputformat) - develop utility of hbase, hadoop - develop performance monitoring tool of hadoop - support technical advice to solve issue of hadoop, hbase and spark

Link Analysis- analyze link of web data- develop MapReduce / Spark program to analyze large scale web link data- develop web front using nodejs and D3.js to visualize result data.Hadoop / Hbase / Spark Tech Support- support hadoop / hbase / spark as code level- develop offline hbase to debug and manage large scale data- bug fix and improve hbase function (snapshot / merge / tableinputformat)- develop utility of hbase, hadoop - develop performance monitoring tool of hadoop- support technical advice to solve issue of hadoop, hbase and spark

mobile casual puzzle/action game- design and develop all of game by self.unity3d plugin for google billing service- https://www.assetstore.unity3d.com/kr/#!/content/8484

RHive (OpenSource) - https://github.com/nexr/RHive - RHive is an R extension facilitating distributed computing via Apache Hive- Initialize OpenSource project- designed and developed R extension for Hive to handle big dataNDAP (Nexr Data Analysis Platform)- NDAP is an big data analysis platform based on hadoop, hive and no-sql.- designed and developed DW part of NDAP using hadoop and hive.Storage Cloud like Amazon S3 (iCube-SC)- icube-sc is hadoop based cloud storage compatible with amazon s3 api.- analysis and mining email data based on distributed computing (Hive) - designed and developed distributed and location based router on zookeeper, apache module- designed and developed metering engineCloud Email Archive Solution Development (Terapot)- Terapot is a archive solution to store massive email for a long time based on distributed computing- analysis and mining email data based on distributed computing (Hive) - designed and developed Map/Reduce Program for Journaling, Indexing, Deduplicating, Merging - designed and developed Distributed Search Server based on Spring, Lucene

WLNG(WebLogic Network GateKeeper) Development- WLNG is network framework which provide palrayX, webservice for IMS- designed ESB function of WLNG to have a message routing function and have more flexible structure - designed and developed heartbeat module to check the availability of network device- designed SLA(Service Level Agreement) of WLNGService Delivery Platform Architecture- SDP(Service Delivery Platform) is a embraced architectural style applied to telecommunications infrastructure problems - designed components of SDP SIP Test Tool : GUI based SIP Protocol test tool SIP Development Framework : like Struts SIP Gateway (SIP to WebService) : like palrayXProject PL- Korea Telecom(KT) BcN/SOA Project- designed, implemented and Consulted KT SDP which exposure services of IMS as WebService.- designed and implemented SDP Portal which have business process to manage exposure services of SDP.- designed and implemented ESB which provide loosely coupling of services- designed and Developed 2 services to show the capability of KT SDP.- One service is a Smart Search that is mesh-up service and provide more accuracy search result Another service is a Mobile vote system that use mobile device (SIP Phone) to vote

Ez-RIDE (Remote IDE) Development- Ez-RIDE is a GUI based remote IDE that enables UNIX server-based application development on PC platform.- designed and developed Visual Template feature which is designed to provide coding standard through template-based application development and improves the overall development productivity.- designed and developed remote Java and COBOL development environment based on Eclipse platform.- developed deployment and authorization management feature.

JEUS (J2EE Application Server) Development- JEUS (Java Enterprise User Solution) is a J2EE compliant application server. JEUS is currently the most widely used J2EE application server in Korea.- provided performance tuning and technical support on JEUS 2.x (J2EE).- participate in design and development of EJB, JMX Monitoring Framework, JNDI, JDBC and Transaction modules for JEUS 3.x (J2EE 1.2).- lead the design and development of EJB, JMX Monitoring Framework, JNDI, JDBC and Transaction modules for JEUS 4.x (J2EE 1.3) and JEUS 5.x (J2EE 1.4).- designed and architected JEUS Portal Server.- developed ORB engine for Java to enable CORBA service from Tmax TPM (TP-Monitor).- work on J2EE Spec group (J2EE 5.0) as company member