• The Journal of the Korea institute of electronic communication sciences
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• v.17 no.6
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• pp.1226-1274
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• 2022

In this paper, we dealt with a safety helmet for detecting dangerous situations that focuses on falling accidents and gas leaks, which are the main causes of industrial accidents. the fall situation range was set through gravity acceleration measurement using an acceleration sensor, and as a result, a fall detection rate of 80% could be confirmed. .In addition, the dangerous gas concentration was measured through a gas sensor, and when a digital value of 188 or more was output through a serial monitor, it was determined as a gas dangerous situation, and a fall warning message and a gas warning message could be checked through a smart-phone application produced based on the app inventor program.

• Journal of Digital Convergence
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• v.11 no.2
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• pp.115-125
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• 2013

Unexpected consumer dissatisfaction emerges through rapid growth and expansion of on-line shopping channel. This research focused on the fashion online retail channels' negative aspect caused by service failure which possibly disappointed consumers. We also tried to seek for appropriate service recovery types based on frequently offered recovery types on-line. Data from college students were analyzed. Results indicate that fitting problem, insufficient information, product defect, inventory problem and slow delivery were the main service failure types in apparel e-shopping. Regression analysis identified that among these types, insufficient information, product defect, and slow delivery had significant influence on channel satisfaction after post recovery effort. Results also confirmed significant relationships between channel satisfaction and channel switching. Consumers perceived benefit level causes overall channel satisfaction level to rise while perceived risk leads to lower level of channel satisfaction. Choosing desirable service recovery activities in each service failure situations is necessary in order to raise consumer's channel satisfaction in online apparel shopping.

• Journal of Digital Convergence
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• v.14 no.5
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• pp.301-307
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• 2016

The location measurement technique of moving worker in dangerous areas, is necessary for safety in the mines, basements, warehouses, etc. There are various measurement techniques about moving node of position in a restricted environment. Trigonometric Method, one of measurement techniques, is commonly used because of its easiness. However, errors occur frequently when measuring distance and position due to radio interference and physical disability with measuring instruments. This paper proposed a method which is more accurate and shows reduced margin of error than existing trigonometric method by recalculating distance between Anchor and moving node with various measuring instruments. By adding Anchor when calculating distance and position of moving node's estimated point, suggested technique obtains at least 41% efficiency compared to existing method.

• Journal of Digital Convergence
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• v.14 no.5
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• pp.217-225
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• 2016

This study examines whether personal traits and globalization capability would affect the entrepreneurial intention. Survey using questionnaires was conducted toward 257 male and female adults aged 21 above across the nation. The analysis of the data shows that the desire for self-fulfillment, risk-taking propensity and sense of self-efficiency as personal traits have positive influence on entrepreneurial intention. And the globalization capability as mediating variable has meaningful influence on entrepreneurial intention, that is, globalization capability under the control of respective personal trait makes positive influence on entrepreneurial intention. Current study would support the potential entrepreneur and the educator to create effective entrepreneurial education program.

• Journal of Digital Contents Society
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• v.19 no.4
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• pp.685-692
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• 2018

The purpose of this study is to develop a prediction model of hypertension in middle-aged adults using Statistical analysis. Statistical analysis and prediction models were developed using the National Health and Nutrition Survey (2013-2016).Binary logistic regression analysis showed statistically significant risk factors for hypertension, and a predictive model was developed using logistic regression and the Naive Bayes algorithm using Wrapper approach technique. In the statistical analysis, WHtR(p<0.0001, OR = 2.0242) in men and AGE (p<0.0001, OR = 3.9185) in women were the most related factors to hypertension. In the performance evaluation of the prediction model, the logistic regression model showed the best predictive power in men (AUC = 0.782) and women (AUC = 0.858). Our findings provide important information for developing large-scale screening tools for hypertension and can be used as the basis for hypertension research.

• Journal of Digital Convergence
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• v.13 no.8
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• pp.419-429
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• 2015

We investigate how the regional prevalence of hyperlipidemia is affected by health-related and socioeconomic factors with a special emphasis on geographic variations. We focus on the likelihood of hyperlipidemia as function of various region-specific attributes. We analysis a data set at the level of 249 small administrative districts collected from 2012 Korean Community Health Survey by Korea Centers for Disease Control and Prevention. To estimate, we use several methods including correlation analysis, multiple regression and decision tree model. We find that the average prevalence of hyperlipidemia in 249 small districts is 9.6% and its coefficient of variation is 28.3%. Prevalence of hyperlipidemia in continental and capital regions is higher than in southeast coastal regions. Further findings using decision tree model suggest that variations of hyperlipidemia prevalence between regions is more likely to be associated with rate of employee, level of stress, prevalence of hypertension, angina pectoris, and osteoarthritis in their regions.

• Journal of Digital Convergence
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• v.10 no.10
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• pp.295-300
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• 2012

Various forward collision warning algorithms have studied in order to protect a car accident. For this, in general, algorithms using an external device such as a camera and sensor generate a forward collision warning. However, if using the external device, it can occur errors due to device characteristics when there is rain or fog. Also, the prevention of a chain-reaction collision is insufficient because the system generates a warning in case of only vehicle having a forward collision danger. If it combines the vehicle safety communications, the method becomes a solution to protect a chain-reaction collision. So, In this paper, we proposes a improved forward collision warning algorithm using the wireless communication technique, driver's information, breaking distance, and velocity. And we compare and analyze our algorithm and previous algorithms.

• Journal of Digital Convergence
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• v.10 no.8
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• pp.149-157
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• 2012

Recently, many corporations and public institutions are busy preparing and providing measures in dealing with new privacy information law. This study reviews privacy impact assessments in order to perform preventing and diagnosis against potential threats focus on the K-hospital case. The quality of protection in K-hospital shows that the corporations itself is 79.0, the system is 97.0, the life cycle of the privacy is 67.4 and CCTV is 90.0. The lowest levels are saving and keeping 50.0, usage and offer 64.1 and destruction 66.7 among the life cycle of the privacy. The result of risk analysis shows that the highest levels are controlling for privacy 11.0, saving and keeping 12.5 and destruction 13.0. From the result, dangerous duplications are saving and keeping and destructions.

• Journal of Digital Convergence
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• v.10 no.5
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• pp.143-154
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• 2012

In this study, Entrepreneurial Intentions of the factors influence the Entrepreneurial Performance and Entrepreneurial Characteristic also was Investigated. Entrepreneurial Characteristic of the each Dimension in the Process of Entrepreneurial Intentions and Entrepreneurial Performance on the Influence of the Mediation Effect was Carried out to Examine. The test results used in this Study Established Entrepreneurial Characteristic of Entrepreneurial Performance and Entrepreneurial Intentions to the Positive Effect was Found. also Verifying the results of the Mediating Effect of Entrepreneurial Performance and Entrepreneurial Performance the Mediation Effect was Verification. These Factors Result in the Entrepreneurial Performance and also in Sales and net profit of Entrepreneurial Intentions Influences. especially, Entrepreneurial Characteristic Specific Need for Achievement, Risk taking and Business Strategy of Entrepreneurial Intentions also the relationship between the Impact is Significant. For this Study K national Institute of Technology, K university, Daegu Y College, J Companies Surveyed Workers and the Findings Were Derived. Specifically, Entrepreneurial in terms of those who have no Experience in Entrepreneurial Characteristic, Entrepreneurial Performance, Entrepreneurial Intentions the Impact on the Relationship Between Entrepreneurial and Provide Suggestions to Determine.

• Journal of Digital Contents Society
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• v.18 no.6
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• pp.1135-1142
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• 2017

In this paper, we propose IoT based smart CCTV security service to prevent crime in blind spot and prevent unexpected fire or danger. In the proposed method, a RC (Radio Control) car is made using Raspberry pie, and a camera and various modules are installed in an RC car. It was then implemented using Raspbian O / S, Apache Web Server, Shell script, Python, PHP, HTML, CSS, Javascript. The RC car provides a security service that informs the manager of the situation by judging the risk of the scene with modules such as video, voice and temperature. Experimental results show that the transmission time of video and audio information is less than 0.1 second. In addition, real-time status transmission was possible in AVG, emergency, and manual mode. It is expected that the proposed method will be applied to the development of smart city by applying it to unmanned vehicles, drones and the like.