• 한국HCI학회:학술대회논문집
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• 2006.02a
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• pp.970-975
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• 2006

There is a tradeoff between user's privacy and utility of context-aware services in ubiquitous computing environments. Many privacy models have been proposed to support the disclosure of personal information at different levels of detail, in ubiquitous computing environments. However, most of these models do not allow for explicit criteria to assess the benefit users are likely to reap by disclosing their personal information. In this paper, we propose an automated decision making mechanism that evaluates the "benefit of disclosure" for the users based on trust relationships between users and information requesters and manages the disclosure of user's personal information accordingly. Unlike other trust models, we do not regard the reputation of an information requester as sufficient to determine his/her trustworthiness. Instead, we represent trustworthiness as a function of information requester's reputation in the eyes of the user and his/her competence in a given context. To validate our mechanism, we apply it to context-aware healthcare application that monitors physiological condition of a user.

• The Journal of Asian Finance, Economics and Business
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• v.7 no.12
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• pp.365-376
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• 2020

This study explores whether the implementation of sustainability disclosure can trigger or stimulate the change in the roles of management accountants in adopting organizations in Vietnam as business partners. To do so, it explores the roles of management accountants in integrated reporting (IR) adopting organizations and sustainability reporting (SR) adopting organizations based on the use of the pragmatic constructivism (PC) theoretical framework. In addition, qualitative semi-structured interviews were used to provide an in-depth investigation of management accountants' work in both IR and SR adopting organizations. The empirical findings suggest that the adoption of the IR framework has triggered changes in management accountant roles toward the new business partner roles to support the decision-making process within their organizations. On the other hand, management accountants from SR adopting organizations still work as traditional "bean-counter" roles. Our paper concludes by indicating several propositions based on our empirical findings that can be tested by future researchers from the domain by collecting relevant data. Our study can be seen as a response to the recent call for a more in-depth examination of the practice of sustainability disclosure from the practitioners' perspectives in adopting organizations.

• ETRI Journal
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• v.35 no.1
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• pp.41-50
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• 2013

Network Mobility (NEMO) handles mobility of multiple nodes in an aggregate manner as a mobile network. The standard NEMO suffers from a number of limitations, such as inefficient routing and increased handoff latency. Most previous studies attempting to solve such problems have imposed an extra signaling load and/or modified the functionalities of the main entities. In this paper, we propose a more secure and lightweight route optimization (RO) mechanism based on exploiting the firewall in performing the RO services on behalf of the correspondent nodes (CNs). The proposed mechanism provides secure communications by making an authorized decision about the mobile router (MR) home of address, MR care of address, and the complete mobile network prefixes underneath the MR. In addition, it reduces the total signaling required for NEMO handoffs, especially when the number of mobile network nodes and/or CNs is increased. Moreover, our proposed mechanism can be easily deployed without modifying the mobility protocol stack of CNs. A thorough analytical model and network simulator (Ns-2) are used for evaluating the performance of the proposed mechanism compared with NEMO basic support protocol and state-of-the-art RO schemes. Numerical and simulation results demonstrate that our proposed mechanism outperforms other RO schemes in terms of handoff latency and total signaling load on wired and wireless links.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.7 no.5
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• pp.1058-1076
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• 2013

The WBAN(Wireless Body Area Network) supplies mobile convenience to our medical services. But if we have few effective control variables across this service deployment, the hidden distortions or defects of the system might threaten the lives and rights of the stakeholders. Therefore we need to increase the service credibility, to get WBAN effective. This study proposes a governance mechanism using feasible variables that are currently in use in practices in WBAN environments against medical incidents. Control variables were tested in Seoul National University hospital and related medical industries of South Korea. We assume that WBAN systems would be open based on integrating patients, medical employees and law enforcements to get smart theater operations against medical incidents by implementing proposed MJA(Multilateral Joint Analysis) model. MJA model also contributes to the convergence of computer systems and medical services by demonstrating flexible SOA(Service Oriented Architecture) dashboard of healthcare services with credibility factors in medicine. The important components in MJA model across WBAN, were found to be "Safety, Accuracy and Reliability" in priority order. Factor analysis, correlations and ANOVA were used to evaluate this model and an IT dashboard with a realization of mobile application, was used to support participants' decision-making.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.11 no.6
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• pp.2963-2978
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• 2017

The Top-K query is currently played a key role in a wide range of road network, decision making and quantitative financial research. In this paper, a Top-K recommendation algorithm is proposed to solve the cold-start problem and a tag generating method is put forward to enhance the semantic understanding of the OLAP session. In addition, a recommendation system for OLAP sessions called "OLAP4R" is designed using collaborative filtering technique aiming at guiding the user to find the ultimate goals by interactive queries. OLAP4R utilizes a mixed system architecture consisting of multiple functional modules, which have a high extension capability to support additional functions. This system structure allows the user to configure multi-dimensional hierarchies and desirable measures to analyze the specific requirement and gives recommendations with forthright responses. Experimental results show that our method has raised 20% recall of the recommendations comparing the traditional collaborative filtering and a visualization tag of the recommended sessions will be provided with modified changes for the user to understand.

• Journal of Energy Engineering
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• v.23 no.3
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• pp.36-41
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• 2014

The world's overall need for natural gas (NG) has been growing up fast, especially in the residential sector. The better the estimation of residential NG consumption (RNGC) distribution, the better decision-making for a residential NG policy such as pricing, demand estimation, management options and so on. Approximating the distribution of RNGC is complicated by zero observations in the sample. To deal with the zero observations by allowing a point mass at zero, a mixture model of RNGC distributions is proposed and applied. The RNGC distribution is specified as a mixture of two distributions, one with a point mass at zero and the other with full support on the positive half of the real line. The model is empirically verified for household RNGC survey data collected in Korea. The mixture model can easily capture the common bimodality feature of the RNGC distribution. In addition, when covariates were added to the model, it was found that the probability that a household has non-expenditure significantly varies with some variables. Finally, the goodness-of-fit test suggests that the data are well represented by the mixture model.

• Journal of the Korea Society of Computer and Information
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• v.6 no.2
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• pp.123-128
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• 2001

In recent years, there has been growing interest among academics and practitioners in improving information system effectiveness of manufacturing firms in Korea. This study is conducted to find critical factors which influence information system effectiveness of manufacturing firms in Korea. The result of this study shows that (1) use of information system for decision-making and (2) use of information system for buyer - supplier relationship and (3) support of top management are very important to increase information system effectiveness. In addition, this study provides information system effectiveness of small manufacturing firms are regarded inferior to large manufacturing firms in Korea.

• Journal of the Korean Home Economics Association
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• v.42 no.2
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• pp.195-212
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• 2004

This research is based on the survey of welfare beneficiaries, aiming to set up the gender-equal welfare policies. Through the survey, this research examines status of women in the family and society and also examines, the degree of perception of women's welfare policies, needs, and satisfaction. According to the survey results, the current welfare policies that are limited to needy women should expand its range, enforcing the infra structure. That employment policy for women turned out to be very important in welfare policies. Demand for more enlarged welfare policies is quite high, especially in housing, employment and elderly care. On the contrary, the degree of satisfaction degree appears quite low because of unrealistic welfare program and benefits. In order to improve the welfare policies, more active and realistic employment policies should be emphasized with the proper support for family life. To raise the status of women, proper policies for women's economic independence should be set up. In addition, consciousness of gender equality should be encouraged in the whole society. Also, women's participation in politics and decision-making process is necessary.

• Journal of KIBIM
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• v.5 no.2
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• pp.1-11
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• 2015

Despite a lot of research on BIM, there is no quantitative study to measure accurately the performance of BIM coordination service. Thus, this study suggested method to measure the performace of BIM coordination services, applying queueing models in the field of management science. To analyze queuing system of BIM coordination services, a group of BIM coordinator were selected. Through focus group interviews with experts were used in the analysis to derive mean arrival rate(${\lambda}$), mean service rate(${\mu}$) of BIM coordination services. Single-server queuing model(M/M/1), multiple server queuing model(M/M/s) is utilized for the BIM coordination services performance measurement in construction phase. This study has significant quantitative performance measurement approaches that can be utilized in the decision-making for the improvement of the BIM coordination services and to support the review of the alternatives accordingly. But There is a limit but it is difficult to take into account the increase or decrease of the cost of alternatives according to the review.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2008.11a
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• pp.315-320
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• 2008

Construction industry have been occurred to the various demand of information. Also information quantity is increasing therefore, The role of information systems is important. Recently PMIS, an efficient decision-making support instrument of construction industry, is applied to various projects. However, its utility is still not enough. So this study suggests the concept model on the basis BIM to settle such a problem. Building the Pilot System was based on this study, and present the direction from Advanced PMIS.