• Journal of the Society of Disaster Information
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• v.18 no.3
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• pp.574-580
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• 2022

Purpose: As corn oil is semi-drying oil, it has more double bonds than non-drying oil and is easier to combine with oxygen. In addition, among the causes of spontaneous ignition, accidents caused by oil-soaked cloths due to oxidative heat are gradually increasing. Therefore, the purpose of this study is to understand the characteristics of spontaneous combustion according to the number of towels and the amount of corn oil at 65℃. Method: After setting the test temperature to 65℃, 25ml, 50ml, 75ml of corn oil per towel was sprayed. The central temperature of the sample rises above the set temperature. It was determined, and when the central temperature of the sample became similar to the set temperature, it was determined as non-igniting. Result: After evenly distributing 25ml of corn oil per towel, as a result of the experiment, 5 towels did not ignite, and 10 and 15 towels ignited. Also, as a result of an experiment using 50ml and 75ml of corn oil per towel, spontaneous ignition occurred when the number of towels was 5, 10, or 15 sheets. Conclusion: Even a small amount can cause a fire if the conditions for spontaneous ignition are met.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.15 no.3
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• pp.1100-1118
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• 2021

In a wide range of ML applications, the training data contains privacy-sensitive information that should be kept secure. Training the ML systems by privacy-sensitive data makes the ML model inherent to the data. As the structure of the model has been fine-tuned by training data, the model can be abused for accessing the data by the estimation in a reverse process called model inversion attack (MIA). Although, MIA has been applied to shallow neural network models of recognizers in literature and its threat in privacy violation has been approved, in the case of a deep learning (DL) model, its efficiency was under question. It was due to the complexity of a DL model structure, big number of DL model parameters, the huge size of training data, big number of registered users to a DL model and thereof big number of class labels. This research work first analyses the possibility of MIA on a deep learning model of a recognition system, namely a face recognizer. Second, despite the conventional MIA under the white box scenario of having partial access to the users' non-sensitive information in addition to the model structure, the MIA is implemented on a deep face recognition system by just having the model structure and parameters but not any user information. In this aspect, it is under a semi-white box scenario or in other words a gray-box scenario. The experimental results in targeting five registered users of a CNN-based face recognition system approve the possibility of regeneration of users' face images even for a deep model by MIA under a gray box scenario. Although, for some images the evaluation recognition score is low and the generated images are not easily recognizable, but for some other images the score is high and facial features of the targeted identities are observable. The objective and subjective evaluations demonstrate that privacy cyber-attack by MIA on a deep recognition system not only is feasible but also is a serious threat with increasing alert state in the future as there is considerable potential for integration more advanced ML techniques to MIA.

• Journal of Digital Convergence
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• v.20 no.5
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• pp.695-702
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• 2022

The purpose of this study was conducted with suggesting a clue to improve the perception of jobs for the elderly, and the final study subject was 110 people. As a research methods were student t-test, ⲭ²-test, one-way ANOVA(Scheffe). The result of the study are as follows. The perception and economic status of the young elderly(65-74 years old) were significantly higher. The perception of public jobs was significantly higher when married, religious, and monthly income was more than 4 million won. The perception of social service-type jobs was significantly higher when married and when there was a religion. The perception of private jobs was high when the monthly income was more than 4 million won (p<0.05). The preference for "parking order service" in the public sector, "support for elderly facilities" in the social service sector, and "fast food restaurant employees, kitchen, restaurant assistants, and food delivery service workers" in the private sector was the highest. In conclusion, there is a need for an education program to improve the perception of jobs for the elderly in order to raise the awareness of job policies for the elderly, which decrease with age. It is expected to be used as basic data for job creation and job creation that can be done according to the age of the elderly.

• Journal of the Korea Convergence Society
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• v.13 no.5
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• pp.45-52
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• 2022

The purpose of this study, a self-written questionnaire was conducted on 110 people aged 65 or older to analyze the factors of meaningful activities in elderly. As a research methods were student t-test and one-way ANOVA were conducted using the SPSS statistical program, and hierarchical regression analysis was performed to identify factors affecting meaningful activities of the elderly. As a result of the study, the highest score was 3.95±0.64 in "I think my work (activity) with my family is rewarding." As a result of hierarchical regression analysis, the factors affecting the meaningful activities of the elderly were 'resident' in both stages 1(β=-.308, p=.002), 2(β=-.330, p=<.001), and 3(β=-.281, p=<.001), and 'age(β=-.215, p=.026)' in the second stage, indicating that the factors affecting the meaningful activities of the elderly were 'resident' and 'age'. In conclusion, it's necessary to develop and apply a systematic program that prioritizes conversation and communication while working with families for the younger elderly(65-74). In the future, it will be necessary to systematically apply various programs for meaningful activities in old age.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2022.05a
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• pp.358-360
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• 2022

Modern society is developing rapidly and technologies that provide convenience in living are developing day by day. On the other hand, the development of cyber attacks that threaten cybersecurity is developing faster, and it still adversely affects the industrial environment, and industrial damage is steadily occurring every year. Industrial security is an activity that safely protects major assets or technologies of companies and organizations from these attacks. Therefore, it is a situation that requires professional manpower for security. Currently, the manpower situation for security is staffed, but knowledge of the understanding and concept of industrial security jobs is insufficient. In other words, there is a lack of professional manpower for industrial security. It is the NCS that came out to solve this problem. NCS is the state standardized ability (knowledge, attitude, skills, etc.) necessary to perform duties in the industrial field. NCS can systematically design the curriculum using NCS as well as help in hiring personnel, and NCS can be applied to the national qualification system. However, in the field of industrial security, NCS has not yet been developed and is still having difficulties in hiring personnel and curriculum. Although the NCS system in the field of industrial security has not been developed, this paper proposes the industrial security NCS to solve the problem of hiring professionals later and to help the field of industrial security NCS to be established later.

• Culinary science and hospitality research
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• v.20 no.2
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• pp.89-99
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• 2014

This study aims to make stock using cod bones with the hot water extraction method. Moisture content, chromaticity, pH, salinity, sugar content, mineral contents, quantitative analysis, and overall acceptance were studied to determine the standard formula. The results are as follows. The moisture content decreased (p < 0.001) and color value increased as heating time increased. The pH was highest in CS5 which was heated for 30 minutes and lowest in CS1. The salinity and sugar content significantly increased with more heating time (p < 0.001). In terms of mineral contents, sodium was highest in 138.87~154.17 mg, magnesium and iron showed proportion difference with increased heating time. The mineral analysis test result revealed that sodium, magnesium and iron showed proportional difference with increased heating time, while potassium and calcium did not change. The result of quantitative analysis test showed transparency, fishy smell, delicate flavor, savory flavor, salt taste and umami taste became stronger as high-pressure heating time increased. From these result, CS4 was evaluated to be the best in appearance, flavor, taste, aftertest and overall acceptance. Also, 60 minute high-pressure heating time is the most desirable to produce stock using cod bones as a main ingredient.

• Journal of Digital Convergence
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• v.11 no.12
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• pp.615-620
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• 2013

This research is a data analysis result of a future gout treatment was carried out in order to take advantage of basic data by Planned Population Federation of Korea in 2012, classified by gender. Using SPSS 18.0 analysis, frequency analysis, chi-squared analysis and logistic regression analysis were conducted. As a result, there were exceptional number of male subjects that required hyperuricemia thorough complete examination, and in case of hypouricemia, it is notable to find much more female subjects (p<0.001). Subjects that required thorough complete examination per age group and hypouricemia were significantly higher in those above the age of 70 years(p<0.001). Conclusions that required hyperuricemia thorough complete examination were a bit higher in the city areas and hypouricemia was a bit higher in the county areas, hyperuricemia was a bit higher in ratio in inland areas and hypouricemia was a bit higher in ratio in the coastal areas. I believe that continuous observation of gout prevalence rate based on this research by year, age group, and gender, would be extremely useful in making decisions regarding the changing trend of gout prevalence rate. In addition, hyperuricemia increased in postmenopausal women, as well as research on the causes of hypouricemia study.

• Culinary science and hospitality research
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• v.19 no.1
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• pp.12-25
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• 2013

This study conducted an empirical analysis on the hypothesis of structural relationship that the resources of diversification foodservice corporations develop into resource sharing about creating synergy on the basis of resource based view. Based on the questionnaire answered by 237 foodservice employees over three years, this study examined its validity and reliability by using SPSS 16.0 and AMOS 5.0 for hypothesis. The result of study modelling were GFI=0.910, NFI=0.915, CFI=0.952, RMSEA=0.070 at the level of $x^2$=179.797(df=83, p<0.001). First, intangible resources 0.180(t=2.371, p<0.05), tangible resources 0.127(t=2.028, p<0.05) and human resources 0.263(t=2.542, p<0.05) of diversification foodservice corporations had positive effects on resource sharing. And resource sharing 0.264(t=3.158, p<0.001) had a positive effect on synergy. Also, between resource sharing and synergy identified moderating effects by synergy implementation cost.

• Korean Journal of Social Welfare
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• v.65 no.4
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• pp.61-88
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• 2013

The aim of this study was to explore the work experiences of hospital-based child protection team staffs who had intervened the child abuse cases resulting in death. In order to gather the relevant data, all 62 child protection teams registered nationwide were contacted and 5 teams which had actually experienced at least one child abuse deaths were found. The staffs (hospital social workers and doctors) who belonged to these teams were intensively interviewed, and the interviewed materials were thoroughly analyzed by qualitative research methodology. The result showed that treatment delay was the most important obstacle to prevent unnecessary deaths of the victims. Some abused victims were sent to the hospital only after their physical condition had so gravely deteriorated. In other cases, custodians' bland denial or refusal to treatment made impossible the timely intervention to save the child lives. Nevertheless, child protection team staffs' reasonable suspicion and active intervention could sometimes uncover the hidden truth that child abuse was the actual cause of death. These incidents were regarded as a team's meaningful accomplishments by team members. Meanwhile, lack of awareness and excessive burden about the role and responsibility of mandated reporter precluded medical staffs' active involvement. Also, substantiating the abuse suspicion by securing positive evidences was found to be a facilitatory factor for the rapid public intervention. On the basis of these results, several practice and policy implications were discussed to improve the early detection process, securing evidence and uncovering the actual cause of death in child abuse deaths.

• Journal of Digital Convergence
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• v.13 no.4
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• pp.303-310
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• 2015

Game technologies are now applied in various engineering areas such as the simulation of surgical operation or the implementation of a cyber model house. One of the essential and important technology in these applications is cutting of the 3D polygon model in real time. Real-time cutting technology is an essential technology needed to implement the simulation of a building demolition or a car assembly for training or educational purpose. Previous cutting method using the conventional BSP-Tree structure has some limitations in that they divide the whole world including the 3D model and its environment, only into two parts with respect to an infinite plane. In this paper, we show a technique cutting the 3D model in a finite extent in order to solve this problem. Specifically, we restricted the cut surface in a finite rectangular area and constructed the mesh for the divided surface. To show the usefulness of our partial cutting technique, an example of the dismantling process simulation of a nuclear reactor polygon model was illustrated.