• Journal of the Korea Society for Simulation
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• v.20 no.4
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• pp.139-147
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• 2011

There is a growing tendency toward a vehicle demand and a utilization of traffic information systems. Due to various kinds of traffic information systems and increasing of communication data, the traffic information service requires a very high IT infrastructure. A cloud computing environment is an essential approach for reducing a IT infrastructure cost. And the traffic information service needs a provisioning scheduling method for managing a resource. So we propose a provisioning scheduling with conditional probability inference (PSCPI) for the traffic information service on cloud environment. PSCPI uses a naive bayse inference technique based on a status of a virtual machine. And PSCPI allocates a job to the virtual machines on the basis of an availability of each virtual machine. Naive bayse based PSCPI provides a high throughput and an high availability of virtual machines for real-time traffic information services.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.15 no.8
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• pp.2827-2848
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• 2021

Mobile Crowdsourcing (MCS) has become an emerging paradigm evolved from crowdsourcing by employing advanced features of mobile devices such as smartphones to perform more complicated, especially spatial tasks. One of the key procedures in MCS is to collect answers from mobile users (workers), which may face several security issues. First, authentication is required to ensure that answers are from authorized workers. In addition, MCS tasks are usually location-dependent, so the collected answers could disclose workers' location privacy, which may discourage workers to participate in the tasks. Finally, the overhead occurred by authentication and privacy protection should be minimized since mobile devices are resource-constrained. Considering all the above concerns, in this paper, we propose a lightweight and privacy-preserving answer collection scheme for MCS. In the proposed scheme, we achieve anonymous authentication based on traceable ring signature, which provides authentication, anonymity, as well as traceability by enabling malicious workers tracing. In order to balance user location privacy and data availability, we propose a new concept named current location privacy, which means the location of the worker cannot be disclosed to anyone until a specified time. Since the leakage of current location will seriously threaten workers' personal safety, causing such as absence or presence disclosure attacks, it is necessary to pay attention to the current location privacy of workers in MCS. We encrypt the collected answers based on timed-release encryption, ensuring the secure transmission and high availability of data, as well as preserving the current location privacy of workers. Finally, we analyze the security and performance of the proposed scheme. The experimental results show that the computation costs of a worker depend on the number of ring signature members, which indicates the flexibility for a worker to choose an appropriate size of the group under considerations of privacy and efficiency.

• International Journal of Computer Science & Network Security
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• v.21 no.12
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• pp.248-256
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• 2021

Now that we're in the big data era, data has taken on a new significance as the storage capacity has exploded from trillion bytes to petabytes at breakneck pace. As the use of cloud computing expands and becomes more commonly accepted, several businesses and institutions are opting to store their requests and data there. Cloud storage's concept of a nearly infinite storage resource pool makes data storage and access scalable and readily available. The majority of them, on the other hand, favour a single cloud because of the simplicity and inexpensive storage costs it offers in the near run. Cloud-based data storage, on the other hand, has concerns such as vendor lock-in, privacy leakage and unavailability. With geographically dispersed cloud storage providers, multicloud storage can alleviate these dangers. One of the key challenges in this storage system is to arrange user data in a cost-effective and high-availability manner. A multicloud storage architecture is given in this study. Next, a multi-objective optimization problem is defined to minimise total costs and maximise data availability at the same time, which can be solved using a technique based on the non-dominated sorting genetic algorithm II (NSGA-II) and obtain a set of non-dominated solutions known as the Pareto-optimal set.. When consumers can't pick from the Pareto-optimal set directly, a method based on Principal Component Analysis (PCA) is presented to find the best answer. To sum it all up, thorough tests based on a variety of real-world cloud storage scenarios have proven that the proposed method performs as expected.

• Journal of Preventive Medicine and Public Health
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• v.57 no.3
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• pp.260-268
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• 2024

Objectives: Regional disparities in cardiovascular care in Korea have led to uneven patient outcomes. Despite the growing need for and access to procedures, few studies have linked regional service availability to mortality rates. This study analyzed regional variation in the utilization of major cardiovascular procedures and their associations with short-term mortality to provide better evidence regarding the relationship between healthcare resource distribution and patient survival. Methods: A cross-sectional study was conducted using nationwide claims data for patients who underwent coronary artery bypass grafting (CABG), percutaneous coronary intervention (PCI), stent insertion, or aortic aneurysm resection in 2022. Regional variation was assessed by the relevance index (RI). The associations between the regional RI and 30-day mortality were analyzed. Results: The RI was lowest for aortic aneurysm resection (mean, 26.2; standard deviation, 26.1), indicating the most uneven regional distribution among the surgical procedures. Patients undergoing this procedure in regions with higher RIs showed significantly lower 30-day mortality (adjusted odds ratio [aOR], 0.73; 95% confidence interval, 0.55 to 0.96; p=0.026) versus those with lower RIs. This suggests that cardiovascular surgery regional availability, as measured by RI, has an impact on mortality rates for certain complex surgical procedures. The RI was not associated with significant mortality differences for more widely available procedures like CABG (aOR, 0.96), PCI (aOR, 1.00), or stent insertion (aOR, 0.91). Conclusions: Significant regional variation and underutilization of cardiovascular surgery were found, with reduced access linked to worse mortality for complex procedures. Disparities should be addressed through collaboration among hospitals and policy efforts to improve outcomes.

• The KIPS Transactions:PartC
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• v.11C no.1
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• pp.47-54
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• 2004

The growth of computer resource and network speed has increased requests for the use of remotely located computer systems by connecting through computer networks. This phenomenon has hoisted research activities for application service provision that uses server-based remote computing paradigm. The server-based remote computing paradigm has been developed as the ASP (Application Service Provision) model, which provides remote users through application sharing protocol to application programs. Security requirement such as confidentiality, availability, integrity should be satisfied to provide ASP service using centralized computing system. Existing Telnet or FTP service for a remote computing systems have satisfied security requirement by a simple access control to files and/or data. But windows-based centralized computing system is vulnerable to confidentiality, availability, integrity where many users use the same application program installed in the same computer. In other words, the computing system needs detailed security level for each user different from others, such that only authorized user or group of users can run some specific functional commands for the program. In this paper, we propose windows based centralized computing system that sets security policies for each user for the use of instructions of the application programs, and performs access control to the instructions based on the security policies. The system monitors all user messages which are executed through graphical user interface by the users connecting to the system. Ail Instructions, i.e. messages, for the application program are now passed to authorization process that decides if an Instruction is delivered to the application program based on the pre-defined security polices. This system can be used as security clearance for each user for the shared computing resource as well as shared application programs.

• Journal of Family Resource Management and Policy Review
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• v.16 no.4
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• pp.195-211
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• 2012

The purpose of this study is to investigate the relationship between leisure time and time pressure based on time availability perspective and gender perspective. For this purpose, this study examined the use of leisure time and the level of time pressure according to gender and gender role attitudes and investigated the relationship between leisure time and time pressure focusing on gender differences in the moderating effect of gender role attitudes. The sample for the study was drawn from the Time Use Survey data collected by Korean National Statistical Office in 2009. Two cases were gathered from each of the samples who are married, aged over 20, presently working and raising preschoolers, which makes 3,150 cases in the total. The major findings are as follows. First, the differences of leisure time between groups according to gender role attitude are not significant, but gender differences are significant. Men's leisure time is more than women's leisure time. Secondly, people with progressive gender role attitudes have higher time pressure than people with conservative gender role attitudes. By the gender groups, women's time pressure is higher than men's time pressure. Thirdly, men's time pressure is decreasing as leisure time increases, but effect of leisure time on women's time pressure is not significant. Women with progressive gender role attitudes have higher time pressure than women with conservative gender role attitudes. On the other hand, influence of gender role attitudes on men's time pressure is not significant. Fourthly, only male group has a significant moderating effect of gender role attitudes in the relationship between leisure time and time pressure. In other words, time pressure of men with conservative gender role attitudes is decreasing more sharply than men with progressive gender role attitudes as leisure time increases. In contrast, increased leisure time does not relieve women's time pressure even though they have conservative gender role attitudes. These results show that men's time pressure can be interpreted in the time availability perspective, while women's time pressure can be described in gender perspective.

• Journal of Family Resource Management and Policy Review
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• v.25 no.4
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• pp.71-86
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• 2021

The purpose of this study is to identify the influencing factors of married men's household labor time by generation to understand the changes in male participation in household labor. To this end, married men were classified into Baby Boomers, Generation X, and Generation Y, and the factors of participation in household labor for each generation were analyzed by applying the hypothesis of participation in household labor. As for the data, the original data of the National Statistical Office's "2019 Time Use Survey" were used. Multinomial logistic analysis was conducted to analyze the factors affecting married men's household labor time. As a result of the analysis, household labor time for Baby Boomers can be explained by the hypothesis of economic efficiency, gender role attitude, and the demand/response capability, while household labor time for Generation X can be explained by economic efficiency hypothesis, gender role attitude hypothesis, time-availability hypothesis, and demand/response capability hypothesis. It was found that the household labor time for Generation Y can be explained by the time-availability hypothesis and demand/response capability hypothesis. The fact that each generation has different factors of participation in household labor suggests that the characteristics of each generation should be considered in establishing policies to support the work and family balance for men.

• 재활복지
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• v.21 no.1
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• pp.47-70
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• 2017

The aim of this study was to explore the effects of the epidemiological factor (depression), the behavioral factor (activities of daily living), the predisposing factor (self-efficacy), reinforcing factors (family support, professional support), and enabling factor (resource availability, accessibility) on quality of life in home-dwelling disabled people in rural areas. The conceptual model for this study was established on the basis of the PRECEDE model which was developed by Green and Kreuter. Data were drawn from the "Preliminary Investigation for Community-centered rehabilitation" conducted by a public health center located in the O province in 2011 and 186 of 190 disabled people who participated in the survey were included in the final analysis. Data were analyzed using Direct effects on quality of life arose from latent variables depicting the epidemiological factor (depression)and reinforcing factor (family support, professional support), while indirect effects arose from the behavioral factor (activities of daily living), the predisposing factor (self-efficacy), and enabling support (resource availability, accessibility). This model explained 85.5% of the variance in quality of life among rural disabled individuals. These findings may have shed some light on the necessity of including strategies to reduce depression and to strengthen supports from family and healthcare professionals when performing rehabilitation programs to improve quality of life in home-dwelling disabled people in rural areas. Furthermore, it suggested that it would be useful to develop specific strategies and tactics which might increase self-efficacy and to expand linkages between public health centers and other professional institutions such as hospitals for community-centered rehabilitation services for individuals with disabilities.

• Science of Emotion and Sensibility
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• v.26 no.2
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• pp.13-24
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• 2023

This study tested whether the evaluation of moral cleansing behavior following an immoral act depends on the resources available to the wrongdoer. To this end, resource availability was manipulated by the wrongdoer's characteristics (socioeconomic status vs. physical health condition) and type of moral cleansing (donation vs. volunteer work), and participants rated the pain of the moral cleansing behavior, hypocrisy, and forgivability. Study 1 presents a scenario where a wrongdoer, either high or low in socioeconomic status, conducts moral cleansing via donation or volunteer work. Participants judged donation by those high in socioeconomic status to be not so painful, hypocritical, and unforgivable. Study 2 described a scenario in which a wrongdoer, either physically strong or weak, performs an act of moral cleansing either by donation or volunteer work. Participants considered those sickly wrongdoers' volunteer work to be painful, less hypocritical, and (compared with other conditions) more forgivable. Mediation analyses showed that in both Studies 1 and 2, pain in moral cleansing influenced the hypocrisy judgment which, in turn, affected perceived forgivability. These results indicate that, even for the same expiatory behavior, moral judgment depends on the actor's available resources. That is, people believe that moral cleansing should involve pain; otherwise, the act is hypocritical and unforgivable.

• Information Systems Review
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• v.14 no.3
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• pp.53-74
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• 2012

IT outsourcing (ITO) is an integration of two firms-external vendor(s) and a client firm-IT resources by contract. According to resource-based view(RBV), three different resources-ITO vendor's resource, client firm's resource, and the relationship resource between two firms- may have an impact on ITO performance. However, there have been few previous studies considering all three IT resources simultaneously. There have been also few empirical studies in ITO context, which test Bharadwaj (2000)'s findings: 1) IT resources can be divided into tangible IT asset and intangible IT capability, and 2) only IT capability has an impact on the IT performance. Therefore we examined whether, in ITO context, all three different resources have a significant impact on ITO performance. Adopting the findings of previous IT studies, we also divided IT resource into IT asset and IT capability. To achieve this research objective, we analyzed 62 ITO cases of 45 companies being listed in Korean top 100 companies for recent 3 years. Also, we analyzed the data with the Partial Least Squares method. The results of this research lead to the following conclusions: First, only when partnership is high, ITO vendors' resource can have an influence on ITO performance. Second, only client firm's IT capability, not IT asset, is directly related to the ITO success. Third, a firm's IT capability can increase the partnership. Therefore, we concluded that 1) RBV is also an useful theory in ITO context, 2) Bharadwaj(2000)'s suggestion is valid in ITO context as well, and 3) the relationship resource is also important in ITO.