• Proceedings of the IEEK Conference
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• 2000.11a
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• pp.481-484
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• 2000

In this paper, we describe the design and implementation of IPv6 LAN. The legacy protocol for Internet is IPv4(IP version 4). The ability of IPv4 is not enough for modern real time multimedia communication services. So IPv6(IP version 6) protocol was suggested to resolve the problems of IPv4. We implemented IPv6 LAN using sTLA(sub Top Level Aggregation identifier) address and KOREN(KOrea Research and Experimental Network). Our IPv6 LAN is connected with 6TAP(Chicago), WIDE(Tokyo), and SingAREN(Singapore). We used a dedicated router, Windows 2000 PC host FreeBSD PC host, Solaris 7 workstation and Solaris 8 workstation for IPv6 NDP(Neighbor Discovery Protocol) protocol test. To support all data services including voice and video, IP protocol should be enhanced because the characteristics of modern network services are requiring QoS(Quality of Service) functions, auto-configuration, security, mobility and so on. So a new IP protocol, IPv6, has been developing to meet the requirements. In this paper, we introduce the implementation method and configuration information of IPv6 LAN.

• Electronics and Telecommunications Trends
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• v.17 no.3 s.75
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• pp.41-52
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• 2002

서브 시스템의 구조와 기능 요소 및 관련 신호 프로토콜에 대해 기술하고 있다. IM 서비스란 이동가입자에게 하부에 IP 전송 프로토콜을 기반으로 하는 다양한 형태의 패킷 서비스들을 동시에 제공하는 것을 말한다. 이를 위해 3GPP에서 제시하고 있는 논리적인 ALL IP 망 구조는 IM CN 서브시스템을 포함하고 있는데, IM CN 서브시스템의 중요한 기능 요소로는 Call Session Control Function(CSCF)와 Home Subscriber Server(HSS) 등이 있다. CSCF는 가입자가 위치하고 있는 망에 따라서 가입자의 세션과 서비스를 제어한다. HSS는 가입자의 마스터 데이터베이스로 기존의 3G HLR의 모든 기능과 User Mobility Server(UMS) 기능을 가진다. 본 고에서는 위의 두 기능 요소들의 기능과 상호 간의 시그널링 프로토콜을 최신 동향을 기반으로 분석하고 기본적인 시그널링 절차도 기술한다.

• Journal of Yeungnam Medical Science
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• v.20 no.2
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• pp.187-196
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• 2003

The cytokines are the hormone-like proteins, which are produced in the mononuclear cells. They have many roles, such as immune mediators, cell differentiations, angiogenesis. The chemokines have chemotactic effects which control the host immune response. There were few reports about the cytokines associated with musculoskeletal tumors. From late 1980s, the cytokine studies of bone tumors such as osteosarcoma were started, but most studies for benign and malignant musculoskeletal tumors were left to be explored. To evaluate the characteristics of the cytokines in variable musculoskeletal tumors, tissues were obtained from the seven patients who visited the Yeungnam University hospital from February to July 2000. They were lipoma (1 case), parosteal osteoma (1 case), enchondroma (2 cases), pigmented villonodular synovitis (1 case), ganglion (1 case), and metastaic squamous cell carcinoma (1 case). The gene experession of the cytokines were analyzed by RNase protection assay (RPA) and reverse transcription-polymerase chain reaction (RT-PCR). The lipoma and parosteal osteoma expressed MIP-$1{\beta}$, and IP-10 genes. The two enchondromas showed different results, one expressed all of MIP-$1{\alpha}$, MIP-$1{\beta}$ and IP-10 genes but the other expressed none of above. The pigmented villonodular synovitis strongly expressed MIP-$1{\alpha}$ and IP-10 when compared with the other cases. The ganglion did not express all of the chemokines mentioned above. And the metastatic squamous cell carcinoma expressed all of the chemokines and especially IP-10 was highly expressed. Even though this study has only a few cases, these results provide a basis for the cytokine mediating network study in musculoskeletal tumors.

• Journal of Korea Multimedia Society
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• v.8 no.11
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• pp.1472-1482
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• 2005

In this paper, we propose a socket interface layer for large-scale multimedia servers that adopt TCP/IP Offload Engines (TOE). In order to provide legacy network applications with binary level compatibility, the socket interface layer intercepts all socket-related system calls to forward to either TOE or legacy TCP/IP Protocol stack. The layer is designed and implemented as a kernel module in Linux. The layer is located between BSD socket layer and INET socket layer, and passes the application's socket requests to INET socket layer or TOE. The layer provides multimedia servers and web servers with the following features: (1) All standard socket APIs and file I/O APIs that are supported (2) Support for binary level compatibility of existing socket programs (3) Support for TOE and legacy Ethernet NICs at the same time.

• Journal of Yeungnam Medical Science
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• v.24 no.2
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• pp.129-136
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• 2007

Purpose : To evaluate the chemokine expression in children with a non-productive cough. Materials and Methods : Six children with a non-productive cough who visited Yeungnam University Hospital were evaluated for the mRNA expression of interferon-${\gamma}$-inducible protein 10(IP-10), macrophage cationic protein 1 and 3 (MCP-1, 3), interleukin (IL)-8, regulated upon activation in normal T cells expressed and secreted (RANTES), eotaxin and growth-related oncogene-${\alpha}$ (Gro-${\alpha}$) using the reverse transcription polymerase chain reaction. Results : The chemokines IP-10 and MCP-3 were expressed in all samples. The chemokine RANTES was expressed in five cases, and IL-8 was expressed in three among them. However, eotaxin, Gro-${\alpha}$ and MCP-1 were not expressed at all. The expression of chemokine MCP-3, RANTES and IL-8 were suppressed after the resolution of coughing in just one available case. Conclusion : The chemokines MCP-3, RANTES and IL-8 may contribute to airway inflammation in children with a non-productive cough, whereas IP-10 is of secondary importance in this condition.

• Journal of Internet Computing and Services
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• v.9 no.2
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• pp.35-42
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• 2008

Mobile IP is a solution to support mobile nodes, however, it does not handle NEtwork MObility (NEMO). The NEMO Basic Support (NBS) protocol ensures session continuity for all the nodes in the mobile network. Since the protocol is based on Mobile IP, it inherits the same fundamental problem such as tunnel convergence, when supporting the multicast for NEMO. In this paper, we propose the multicast route optimization scheme for NEMO environment. We assume that the Mobile Router (MR) has a multicast function and the Nested Mobile Router Information (NeMRI) table. The NeMRI is used to record o list of the CoAs of all the MRs located below it. And it covers whether MRs desire multicast services. Any Route Optimization (RO) scheme can be employed here for pinball routing. Therefore, we achieve optimal routes for multicasting based on the given architecture. We also propose cost analytic models to evaluate the performance of our scheme. We observe significantly better multicast cost in NEMO compared with other techniques such as Bi-directional Tunneling, Remote Subscription, and Mobile Multicast based on the NBS protocol.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.11A
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• pp.1101-1112
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• 2006

With the recent growth in demand for high-data rate multimedia services in the wireless environments, the Mobile Broadband Wireless Access (MBWA) technologies, such as WiBro (Wireless Broadband internet) system, are gradually coming into the spotlight. Unlike the conventional mobile communication networks based on cellular system, the WiBro system basically consists of IP based backbone networks that will be ultimately deployed by Ipv6 (IP version six) based backbone networks according to the All-IP trend for the network evolution. In such wireless mobile environments, it is needed to support the mobility management protocol on network layer as well as physical layer and Medium Access Control (MAC) layer in WiBro system. Accordingly, in this paper, we propose a fast handover scheme for improving the handover performance in IPv6 based WiBro system and show that the proposed scheme achieves loss-free and low handover latency during inter-subnet movement of the mobile stations through the simulation.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.8A
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• pp.787-793
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• 2008

3GPP evolved packet system (EPS) is an all-IP based system that supports various access networks such LTE, HSPA/HSPA+, and non-3GPP networks. Recently, the support of IP flows with packet level QoS profiles was added to the requirements of the EPS. This paper proposes an adaptive modulation and coding (AMC) scheme that supports the QoS of such IP flows in the 3G LTE access network of the EPS. Defining the retransmission as a critical factor for QoS, the proposed scheme applies different maximum packet error probability $P_{max}$ to each packet when selecting the AMC transmission mode. In determining $P_{max}$, the QoS constraints and NACK-to-ACK error as well as channel condition are considered, balancing two objectives: the satisfaction of the QoS and the maximization of spectral efficiency. The simulation results show that it is able to reduce both delay violation and status report by 10%, while improving the throughput 10% in comparison with an existing scheme.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.42 no.12
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• pp.63-70
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• 2005

Various schemes for mobility are currently studied in ITU-T, 3GPP, IETF, and so on. Mobility support in NGN for seamless service is necessarily required. Currently proposed mechanisms are MIPv6, $IP^2$, and Q.MMF. However the performance comparison of all existing schemes is not examined as yet. That is, the existing methods need to be compared according to each performance parameter. So, in this paper, we investigate and compare the performances of MIPv6, $IP^2$, Q.MMF to location registration. In addition, this paper presents the performance comparison of handover latency times. For this, we use NS-2 simulator. As a result of analysis, $IP^2$ shown the best performance as it is measured the minimum time and cost. And it has low handover latency time in comparison with other mechanisms.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.5 no.3
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• pp.27-45
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• 2010

It is strongly believed that multicast will become one of the most promising services on internet for the next generation. Multicast service can be deployed either on network-layer or application-layer. IP multicast (network-layer multicast) is implemented by network nodes (i.e., routers) and avoids multiple copies of the same datagram on the same link. Despite the conceptual simplicity of IP multicast and its obvious benefits, it has not been widely deployed since there remain many unresolved issues. As an alternative to IP multicast, overlay multicast (application-layer multicast) implements the multicast functionality at end hosts rather than routers. This may require more overall bandwidth than IP multicast because duplicate packets travel the same physical links multiple times, but it provides an inexpensive, deployable method of providing point-to-multipoint group communication. In this paper we develop an efficient method applied greedy algorithm for solving two models of overlay multicast routing protocol that is aimed to construct MDST (Minimum Diameter Spanning Tree : minimum cost path from a source node to all its receivers) and MST (Minimum Spanning Tree : minimum total cost spanning all the members). We also simulate and analyze MDST and MST.