• Journal of Communications and Networks
• /
• v.14 no.3
• /
• pp.225-229
• /
• 2012

We examine spectrum sensing in a situation of uncertain channel model. In particular, we assume that, besides additive noise, the observed signal contains an interference term whose probability distribution is unknown, and only its range and maximum power are known. We discuss the evaluation of the detector performance and its design in this situation. Although this paper specifically deals with the design of spectrum sensors, its scope is wider, as the applicability of its results extends to a general class of problems that may arise in the design of receivers whenever there is uncertainty about how to model the environment in which one is expected to operate. The theory expounded here allows one to determine the performance of a receiver, by combining the available (objective) probabilistic information with (subjective) information describing the designer's attitude.

• Journal of the Society of Disaster Information
• /
• v.6 no.2
• /
• pp.11-20
• /
• 2010

All of the people or objects which are contacted during the activity of guard are added to range of objects. guard has to notice decision, question proposal, observation, accomplish to be happened them at the same time recognizing the steps as soon as possible. Before a lot of information of client are shown, guard expert has to search observation of materialization, extension of reservation, notification of business and causes of danger through personal interviews. Rapid communication system has to be assumed and effective caution, protection and shelter and following prevention are cooperated as well as has to care about safe of guard object by a protective wall. And also has to get out of the ground, keep the large shape when moves, prevent the trials of attack from the assassinators after takeing control over weapons.

• Management & Information Systems Review
• /
• v.21
• /
• pp.169-187
• /
• 2007

Today, the principle of competition is being applied to Non-profit sector also. It is necessary for relevant persons in charge to learn the knowledge and technique about marketing technique endlessly in connection with the development of donor out of the development of social welfare resource which is being embossed as main pending problem at the point of time when the role of private sector about welfare service increased and the criterion of competition and evaluation among institutions was introduced. Especially, as for the application of marketing technique to utilize internet to have big marketing potential, the efforts for the realization and application of positive marketing to be suitable for the real situation of each institution is necessary in connection with the donor development of social welfare institution. In this study tried to examine the charge of method to develop donor which is based on the development of information technique and the popularization of internet from the viewpoint of internet marketing and suggest the basic data about the present situation of donor marketing to use the effective scheme for internet marketing.

• International Journal of Fuzzy Logic and Intelligent Systems
• /
• v.8 no.4
• /
• pp.270-275
• /
• 2008

Under ubiquitous environment, recommendation system is using the collaborative filtering methods by quantifying context information, but insufficient context information can cause inaccurate recommendation result. In order to solve such problems, the researcher used context information and user's profile. But service history information in users' profiles can have the problems of being influenced by change of the user's taste or fashion as time passes by. In addition, context information and user's profile can't be properly inter-locked according to situation, which can cause inaccurate predictability. In this paper, in case a user's taste or fashion is changed as time passes by, the researcher didn't apply bundled-up value to the user's profile but applied different weight according to change of time. And the researcher could solve the problem that context information and a user's profile can't be properly inter-locked according to situation by applying different weight to the result gained by means of collaborative filtering and then by unifying it. In such ways, the researcher could improve predictability.

• Journal of the Korean Professional Engineers Association
• /
• v.26 no.6
• /
• pp.40-53
• /
• 1993

• Journal of the Korean Professional Engineers Association
• /
• v.26 no.5
• /
• pp.74-85
• /
• 1993

• Journal of Advanced Navigation Technology
• /
• v.18 no.4
• /
• pp.278-287
• /
• 2014

ADS-B is a newly developed air surveillance technology to address the consistently increasing air traffic needs. ADS-B attracts attention for replacing or complementing a conventional radar since ADS-B can provide more accurate position information with a shorter interval when compared to the radar. However, as ADS-B uses wireless data links on exchanging information between an aircraft and a ground ADS-B system, and uses protocols without integrity support on exchanging information within the ground ADS-B system, a system which can monitor the operational status of an ADS-B system is essential. In this work, we design and implement an ADS-B monitoring system capable of displaying air traffic situation that can show the comprehensive air traffic situation while monitoring the operational status of the ADS-B system. The implemented ADS-B monitoring system has been verified with a configured ADS-B ground system by displaying ADS-B surveillance data, radar surveillance data, and flight information after receiving live surveillance data of in flight aircrafts, and virtual flight information data.

• The Journal of the Korea Contents Association
• /
• v.15 no.5
• /
• pp.27-35
• /
• 2015

Depending on the smart device user growth and development of communication technology, the area about working environment was extended without constraints of time and places. It is introducing to work using user's devices and this environment is called 'BYOD(Bring Your On Device)'. But it is vulnerable to security threat that happened in existing wireless environment and its security threat issue which is caused by inside information leak by an inside job and lost or stolen terminal which is caused by careless user is getting heated. So we studied about access control protocol by user rights under the BYOD situation make a session key based on the user information. We make a session key based on the user information and user device information, after that we design an access control protocol. The protocol we suggest can protect from attack under the BYOD situation and wireless communication situation and also safety and security requirement from inside information leak because it controls user rights.

• Journal of Information Technology Applications and Management
• /
• v.24 no.2
• /
• pp.39-54
• /
• 2017

At present, various technologies are rapidly advancing, centering on the concept of virtuality. From the technology of virtual reality, which allows us to experience the senses as if they existed, to the technology of augmented reality, which provides new information or services based on reality, they are no longer strange things for ourselves because we experience them every day and night. Even though the concept of virtual is very familiar in terms of technology, it is not known how individuals accept the concept of virtuality, how they change our way of thinking, and how their behavior changes. This study aims to approach virtuality perceived by the individual from the viewpoint of individual's information processing. Virtuality is defined as the degree to which the situation facing an individual is far from actual reality. An individual can judge the degree of virtuality easily, which is considered to be a psychological distance which is an important factor in personal information processing. In this study, we have confirmed whether the argument is applied to the real world in the context of advertisement. According to the construal level theory, when an individual feels virtuality at a high level, the individual thinks that the situation they are facing is psychologically distant and accordingly has a high level construal. Therefore, it is more influenced by 'advertisement emphasizing symbolic appeal' which is matching with higher level. On the other hand, when an individual feels a low level of virtuality, the individual thinks that the situation they are facing is psychologically near and thus has a low level construal. Therefore, respondents are more sensitive to functional appeal, which is related to lower level. This study has the theoretical contribution in terms that the degree of virtuality affects the psychological distance of the individual. In addition, the results of this study have practical contribution in terms of being able to be actively used in the information delivery strategy centered on the advertisement.

• Journal of Intelligence and Information Systems
• /
• v.13 no.4
• /
• pp.45-63
• /
• 2007

Recently as ubiquitous environment comes to the fore, information density is raised and enterprise is being able to capture and utilize customer-related information at the same time when the customer purchases a product. In this environment, a need for the recommender systems which can deliver proper information to the customer at the right time and right situation is highly increased. Therefore, the research on recommender systems continued actively in a variety of fields. Until now, most of recommender systems deal with item recommendation. However, in the market in ubiquitous environment where the same item can be purchased at several stores, it is highly desirable to recommend store to the customer based on his/her contextual situation and preference such as store location, store atmosphere, product quality and price, etc. In this line of research, we proposed the store recommender system using customer's contextual situation and preference in the market in ubiquitous environment. This system is based on collaborative filtering and Apriori algorithms. It will be able to provide customer-centric service to the customer, enhance shopping experiences and contribute in revitalizing market in the long term.