• Journal of KIISE
• /
• v.45 no.1
• /
• pp.76-85
• /
• 2018

Governments and public agencies try to use the cloud to carry out their work and provide public services. However, a public cloud is vulnerable to security side because it has a structure to support services using public networks (i.e, the internet). Thus, this paper finds the general security vulnerabilities of a network and compares and analyzes the characteristics of transport protocols (UDP, TCP, SCTP, and MPTCP) on the basis of their security vulnerabilities. This paper uses a reliability and security factor for the comparative analysis, evaluates the security exposure, and chooses a suitable protocol considering the security of the transport protocols in the cloud circumstance.

• Proceedings of the IEEK Conference
• /
• 2003.07d
• /
• pp.1327-1330
• /
• 2003

The internet SCSI(iSCSI) disk has been studied as a storage system which can be directly connected to TCP/IP network. We designed and implemented a shared disk following the iSCSI protocol and providing cache consistency. It is named as intelligent iSCSI(i$^2$SCSI) disk. The i$^2$SCSI disk provides cache consistency of all blocks that belong to the disk using a conventional lease method and it uses 'contiguous blocks-level locking' The prototype of the i$^2$SCSI disk emulator and its client is designed and implemented in Linux 2.4.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2003.11b
• /
• pp.923-926
• /
• 2003

iSCSI(Internet Small Computer Systems Interface)프로토콜은 TCP/IP 네트워크를 통해 블록 중심형 스토리지 데이터에 접근을 가능하게 하는 SCSI 전송프로토콜이다. iSCSI는 서버에서 스토리지장치로의 데이터 전송을 위해 표준 이더넷 스위치와 라우터를 사용하며, 또한 기존의 IP 네트워크를 사용하여 SAN 의 확장이 가능하다. 본 논문에서는 이러한 iSCSI 를 사용하여 여러가지 다른 환경에서 iSCSI 프로토콜의 성능을 분석한다. 첫째는 스토리지 장치에 따른 iSCSI 의 성능변화와 둘째는 현재의 네트웍 망에서의 변화이다. 이더넷에서 스토리지 데이터를 액세스하는데 있어서 시급했던 문제중에 하나는 충분한 대역폭과 낮은 지연율을 제공하는 것이었다. 최근의 이더넷 기술의 발전은 IP 네트워크를 통해 스토리지 장치를 액세스하는 것이 가능해졌으며 백본망을 비롯한 기가비트 이더넷이 활성화된 오늘날의 네트워크 망에서 iSCSI를 이용한 스토리지 서비스가 활성화 될 것이다. 본 논문에서는 iSCSI의 기반이 되는 IP네트워크에서의 iSCSI의 성능을 분석한 내용을 기술한다.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2006.10a
• /
• pp.355-356
• /
• 2006

• Proceedings of the Korean Ceranic Society Conference
• /
• 2002.10a
• /
• pp.127.2-127
• /
• 2002

• Proceedings of the Korean Society of Dyers and Finishers Conference
• /
• 2008.10a
• /
• pp.9-10
• /
• 2008

Tricrecyl phosphate(TCP)-containing polyurea microcapsules were prepared by interfacial polymerization using aromatic 2,4-toluene diisocyanate(TDI) and Ethylene diamine(EDA) as wall forming materials. The effects of the protective colloids of polyvinylalcohol(PVA) and gelatin were investigated through experimentation.

• Journal of Internet Computing and Services
• /
• v.10 no.4
• /
• pp.199-211
• /
• 2009

Recent advancements in wireless networks have enabled support for mobile applications to transfer data over heterogeneous wireless paths in parallel using data striping technique [2]. Traditionally, high performance data transfer requires tuning of multiple TCP sockets, at sender's end, based on bandwidth delay product (BDP). Moreover, traditional techniques like Automatic TCP Buffer Tuning (ATBT), which balance memory and fulfill network demand, is designed for wired infrastructure assuming single flow on a single socket. Hence, in this paper we propose a buffer tuning technique at senders end designed to ensure high performance data transfer by striping data at transport layer across heterogeneous wireless paths. Our mechanism has the capability to become a resource management system for transport layer connections running on multi-homed mobile host supporting features for wireless link i.e. mobility, bandwidth fluctuations, link level losses. We show that our proposed mechanism performs better than ATBT, in efficiently utilizing memory and achieving aggregate throughput.

• Journal of Radiation Industry
• /
• v.3 no.1
• /
• pp.39-45
• /
• 2009

Three mineral phosphate solubilizing (MPS) bacteria where isolated from rhizosphere soil samples of common bean and weed plants. 16S rDNA analysis indicated that the isolate P2 and P3 are closely related to Pantoea dispersa while isolate P4 is closely related to Pantoea terrae. Isolates P2 and P3 recorded $381.60{\mu}g\;ml^{-1}$ and $356.27{\mu}g\;ml^{-1}$ of tricalcium phosphate (TCP) solubilization respectively on 3 days incubation. Isolate P4 recorded the TCP solubilization of $215.85{\mu}g\;ml^{-1}$ and the pH was dropped to 4.44 on 24 h incubation. Further incubation of P4 sharply decreased the available phosphorous to $28.94{\mu}g\;ml^{-1}$ and pH level was raised to 6.32. Gamma radiation induced mutagenesis was carried out at $LD_{99}$ dose of the wild type strains. The total of 14 mutant clones with enhanced MPS activity and 4 clones with decreased activity were selected based on solubilization index (SI) and phosphate solubilization assay. Mutant P2-M1 recorded the highest P-solubilizing potential among any other wild or mutant clones by releasing $504.21{\mu}g\;ml^{-1}$ of phosphorous i.e. 35% higher than its wild type by the end of day 5. A comparative evaluation of TCP solubilization by wild type isolates of Pantoea and their mutants, led to select three MPS mutant clones such as P2-M1, P3-M2 and P3-M4 with a potential to release >$471.67{\mu}g\;ml^{-1}$ of phosphorous from TCP. These over expressing mutant clones are considered as suitable candidates for biofertilization.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2013.05a
• /
• pp.281-283
• /
• 2013

In this paper, we have presented the implementation plan for the Server interface and how to implement the Client GUI interface of a form you can use Android considerations and ERP Interface methods available in mobile devices, with iOS. It provides in the form of Web services using TCP / IP, how to handle the data, communication of Client and Server in mobile devices, coordination of ERP that can be used in mobile devices by presenting how to send in XML format it presented a new method which can be performed more efficiently.

• Proceedings of the Korea Contents Association Conference
• /
• 2006.11a
• /
• pp.845-848
• /
• 2006

In this paper, a ETI management system for a variety of media services based on Terrestrial-Digital Multimedia Broadcasting(T-DMB) is introduced. This system consists of DMB I/O board and DMB multiplexer. The system transforms media data stream over IP(TCP/IP or UDP/IP) for these services to ETI frame(G.703) pushed to T-DMB transmitter.