Hyewon K. Lee

Design of active HoneyPot system

According to rapid growth of Internet infrastructure and information technology, anyone can get knowledge legally or illegally. Internet users can be classified as normal and abnormal user. Especially, abnormal users with hostility are getting more intelligent, so they can drain away the valuable information and use or destroy it illeglly. The damage from abnormal user is also increasing, but research to detect abnormal users and to protect information is at still initial stage. The most security systems focus on how to detect and respond such an intrusion as quickly as possible of which they already have knowledge. In case of unknown intrusion, it is much harder to detect and respond it. In this paper, we implement a virtual emulation service that leads an intruder into HoneyPot, which monitors all behaviors in step by step. Building the new knowledge on the access paths and skills of intruder allows us to make a policy to protect a system from new attacks. Furthermore, we present an Active HoneyPot System, which combined with firewall and management server. In this system, firewall redirects an abnormal user to HoneyPot to learn advanced intruding skills and to respond more actively.

Node Configuration Protocol Based on Hierarchical Network Architecture for Mobile Ad-Hoc Networks

Mobile Ad-Hoc Network (MANET) is a multi-hop wireless network without any prepared base station. It is capable of building a mobile network automatically with no help from DHCP servers and routers to forward or route messages. In this paper, we present a new configuration protocol based on two-tiered hierarchical network architecture for MANET. To guarantee the uniqueness of address and to support a fast and reliable node configuration, a new model, MUnit (Mobile Unit) is proposed. In a peer to peer environment, this two-tiered model effectively carries out well. This architecture ensures facility for address allocation and duplication check.Rapid growth of the industry of mobile devices and mobile networks like IEEE802.11 and ad hoc networks will change the concept of the mobile service. Service providers like drug stores and information center for the strangers may want to give their services to the citizens wherever the service providers want to serve. In this paper, we propose ZBS (Zone-Based Service) architecture for the new concept of the mobile service in ad hoc networks. And end users can efficiently find the location of themselves in our service architecture. We describe the implementation issues such as adaptations and modifications of existing elementary. We implement ZBS architecture on the Linux platform, verify its functional requirements, and show experimental results with finding the location of en end user.

Performance Evaluation of ENUM Directory Service Design

ENUM (tElephone NUmbering Mapping) is a protocol that brings convergence between PSTN networks and IP networks using a unique worldwide E.164 telephone number. This mechanism couples two completely different environments with E.164 number and allows users to utilize IP based application services in PSTN networks and PSTN based application services in IP networks. We propose a new way to organize and handle ENUM name servers to improve the performance of name resolution process in ENUM based application service. We have built an ENUM based network model when NAPTR (Naming Authority PoinTeR) resource record is registered and managed by area code at the initial registration step.

A Study on Hairdo Attitude and Hairdo Involvement

The purpose of this study was to investigate the factors of hairdo attitude and hairdo involvement, the differences in the hairdo involvement by hairdo attitude. The questionnaires were given to female residents in Seoul and Kyung-gi do during September to October 2006. 406 questionnaires were used for data analysis. The collected data were analyzed using SPSS 12.0 software such as factor analysis, Cronbach`s alpha, ANOVA test and Duncan test. The results of this study were as follows: 1. The hairdo attitude factors were found to be `leader`s fashion conformity`, `distinct individuality`, `constancy`, and `consciousness of others` The hairdo involvement factors were found to be `interests in hairdo`, `fashionableness`, `symbolic representation`, `risk awareness`, and `coordination of hairdo`. 2. As for the hairdo attitude, two groups were identified as the highly-oriented group and the lowly-oriented group. There were significant differences in all hairdo involvement factors depending on two groups. Highly-oriented groups of `leader`s fashion conformity` considered more about interests in hairdo, fashionableness, symbolic representation, and coordination of hairdo, except for risk awareness, signalling that the more people respond to leader`s fashion, the higher they are involved with hairdo. Highly-oriented group of `constancy` showed significant differences in fashionableness and risk awareness. Lower level of fashionableness but higher level of risk awareness than the lowly-oriented group. Highly-oriented group of `consciousness of others` displayed high performance in all factors, implying that the more people respond to feedback and evaluation of others, the higher they are involved with hairdo.

An optimized internetworking strategy of MANET and WLAN

In this paper, we propose internetworking strategy of WLAN and MANET. Both WLAN and MANET are based on IEEE 802.11 for MAC layer protocol while they adopt different mode, such as infrastructure and ad-hoc. To support internetworking between different IEEE 802.11 modes, switching algorithm on mobile node is proposed. This algorithm is mainly affected by users preference, not only by signal strength. For MANET routing protocol, OLSR is employed, which is a proactive protocol and has optimally reduced signal broadcasting overhead. The effect of distances between a mobile node and MANET Gateway which is a link to WLAN is proved when the mobile node resides on MANET. Also, latencies between handoff from WLAN to MANET and handoff from MANET to WLAN are compared.

A handover scheme based on HMIPv6 for b3g networks

By complementary integration of UMTS and WLAN, a beyond third generation (B3G) mobile network has been proposed to establish better global roaming environments. The integrations of UMTS and WLAN are classified into two groups: loosely-coupled and tightly-coupled. A tightly-coupled network demands lots of investment and considerable amount of time to construct. On the other hand, a loosely-coupled network is more scalable and easier to implement than a tightly-coupled one while it has critical drawbacks of packet loss and blocking of services due to handover delay. To alleviate these drawbacks, this paper proposes a handover scheme between UMTS and WLAN, which is based on HMIPv6. The performance of the proposed scheme is evaluated adding the handover time of each step, and the blocking probability is computed in each scheme. The proposed internetworking schemes performance based on HMIPv6 is two times more likely than that based on MIP.

A Tendency of Appearance Management Behavior and Pursuing Ideal Age -Focused on the 20`s and the 30`s Korean-

This study has examined the 20`s and the 30`s Korean who have a desire, `to be getting younger` and how to relate what appearance management-behavior they follow. The methodology of this study used both theoretical and quantitative research for an empirical study. First, a theoretical study researched a big stream of the 20`s and the 30`s Koreans` to be getting younger` on articles based on the social and cultural background of the past 30 years that defined various concepts of age through previous research. Data was also collected via SMS for five months (August to December 2014) and 96 Korean participants in their 20`s and the 30`s who have lived in and around Seoul. The results of the survey analysis showed that the desire of `to be getting younger` irrelevant to the age among Korean young people. In addition, this tendency to be the ideal age as being younger is realized by appearance management sort of skin care or clothing styling among 20`s and the 30`s Korean. This study suggested a phenomenon, `to be getting younger` in Korean society would lead to an alternative sort of age that targets individual taste rather than the chronological age in the apparel market.

Adaptive mode switching for internetworking of MANET and WLAN based on HMIPv6

For extending of hot-spot of wireless LAN (WLAN), [1] proposes internetworking scheme between WLAN and mobile ad-hoc network (MANET), which employ the same layer-2 protocol with different mode. Compared to internetworking schemes between UMTS (Universal Mobile Telecommunications Systems) and WLAN [3-4], the scheme from [1] has relatively low overhead and latencies because WLAN and MANET are physically and logically similar to each other. However, the mode switching algorithm proposed in [1] for internetworking only considers signal strength and determines handoff, and mobile nodes following a zigzag course in pollution area may frequently perform handoff at short intervals. Furthermore, [1] employs mobile IPv6 (MIPv6) at base, which brings still high delay on handoff and overhead due to signal message exchange. In this paper, we present optimized internetworking scheme between WLAN and MANET, modified from [1]. To settle ping-pong handoff, we propose adaptive mode switching algorithm. HMIPv6 is employed for IP connectivity and mobility service in WLAN, which solves some shortcomings, such as high handoff overhead and vulnerable security from MIPv6. For routing in MANET, OLSR is employed, which operates with current IP protocol compatibly with no change or modification. The proposed internetworking scheme based on adaptive mode switching algorithm shows better performance than scheme from [1].

Automatic node configuration protocol using modified CGA in hierarchical MANETs

The CGA is designed to prevent address spoofing and stealing and to provide digital signature to users without any help from security infrastructures, but fake key generation and address collision appear in flat-tiered network. To solve these problems, CGA defines security parameter (SEC), which is set to high value when high security is required. Although CGA with high SEC makes attackers be difficult to find fake key, it brings an alarming increase in processing time to generate CGA. On the contrary, the probability to find a fake key is high if low SEC is applied to CGA. In this paper, MCGA applicable to as well public networks as ad-hoc networks is proposed. Address collision problems are settled by employing hierarchy. Using MCGA, no previous setup is required before communication, and automatic node configuration is feasible.

A Study on TCP Buffer Management Algorithm for Improvement of Network Performance in Grid Environment

The Grid is the environment that connects high performance computing resource, which are scattered geographically as related network. The Grid, which started in the mid of 1990, has studied and laid across in BT, NT, and ET fields. The Grid applications are developed to act as global infrastructure, especially, linked as high performance network. Nevertheless, the Grid network envionment are consists of high speed researches, it uses network management method of former old internet envionment, and it cannot take the full advantage of high performance network. This research suggests TCP buffer control mechanism that is more appropriate in high performance network for better performance in The Grid network. In addition, controlled method analyzes the network performance using the Globus Toolkit 3.0, which is the most recent Grid middleware.