• Journal of KIISE:Information Networking
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• v.32 no.3
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• pp.279-290
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• 2005

Recently, as the serious damage caused by DDoS attacks increases, the rapid detection and the proper response mechanisms are urgent. However, existing security mechanisms do not effectively defend against these attacks, or the defense capability of some mechanisms is only limited to specific DDoS attacks. In this paper, we propose a detection architecture against DDoS attack using data mining technology that can classify the latest types of DDoS attack, and can detect the modification of existing attacks as well as the novel attacks. This architecture consists of a Misuse Detection Module modeling to classify the existing attacks, and an Anomaly Detection Module modeling to detect the novel attacks. And it utilizes the off-line generated models in order to detect the DDoS attack using the real-time traffic. We gathered the NetFlow data generated at an access router of our network in order to model the real network traffic and test it. The NetFlow provides the useful flow-based statistical information without tremendous preprocessing. Also, we mounted the well-known DDoS attack tools to gather the attack traffic. And then, our experimental results show that our approach can provide the outstanding performance against existing attacks, and provide the possibility of detection against the novel attack.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.7
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• pp.466-475
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• 2017

The purpose of this study was to investigate the status of infection control in long term care hospitals. Data were gathered from 156 long term care hospitals that received certification evaluation from May 1, 2016 to July 31, 2016. We used a questionnaire consisting of 85 items regarding the status and perceived importance of infection control. The data were analyzed using the SPSS / WIN 21.0 program. All of the hospitals have infection control regulations, 80.4% of them have an infection control committee and 86.0% of them employ an ICP(infection control practitioner) who holds this position in addition to another. Hand hygiene showed the highest score at 4.47 in the perceived importance of infection control. Employee education and compliance with the validity period of sterilized products showed the highest frequency and perceived importance among the infection control activities. The above results show that almost all of the long term care hospitals have infection control regulations, but that these regulations are not properly implemented, because of the lack of applicable regulations on the policy level. Therefore, it is necessary to develop infection monitoring standards and infection control guidelines for long term care hospitals and provide the infection control practitioners with training in how to apply them.

• Journal of the Institute of Electronics and Information Engineers
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• v.49 no.10
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• pp.60-68
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• 2012

Current wireless sensor networks are considered to support more complex operations ranging from military to health care which require energy-efficient and timely transmission of large amounts of data. In this paper, we propose an adaptive temporal suppression algorithm which exploits a temporal correlation among sensor readings. The proposed scheme can significantly reduce the number of transmitted sensor readings by sensor node, and consequently decrease the energy consumption and delay. Instead of transmitting all sensor readings from sensor node to sink node, the proposed scheme is to selectively transmit some elements of sensor readings using the adaptive temporal suppression, and the sink node is able to reconstruct the original data without deteriorating data quality by linear interpolation. In our proposed scheme, sensing data stream at sensor node is divided into many small sensing windows and the transmission ratio in each window is decided by the window complexity. It is defined as the number of a fluctuation point which has greater absolute gradient than threshold value. We have been able to achieve up about 90% communication reduction while maintaining a minimal distortion ratio 6.5% in 3 samples among 4 ones.

• Journal of vocational education research
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• v.37 no.6
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• pp.85-104
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• 2018

The purpose of this study was to identify the meditating effect of self leadership on the relationship between protean career attitude and subjective career success of lifelong learning educators. Based upon the results, several theoretical and practical suggestions were made to enhance self leadership, protean career attitude and subjective career success of lifelong learning educators. A survey questionnaire for this study was composed of four parts, such as the measurement tool of Protean Career Attitude(Briscoe, Hall & Demuth, 2006), Self Leadership Scale(Houghton & Neck, 2002), Subjective Career Success(Career satisfaction Scale: Greenhaus, Parasuraman & Wormley, 1990; Job Satisfaction Scale: Mobley, Jarret, Marsh & Lim, 1994; Employability Inventory: Johnson, 2001) and demographics. The subjects in this study were lifelong learning educators in Incheon. The survey questionnaires from 450 respondents were gathered, and the data from 426 respondents were used for analysis. The results of this study were as follows: First, protean career attitude of the lifelong learning educators had direct effect on subjective career success positively. Second, protean career attitude of the lifelong learning educators had indirect effect on the subjective career success with the partial mediating effect of self-leadership. Finally, based upon the above results, some implications and limitations of this study were discussed.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.14 no.1
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• pp.73-83
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• 2019

As the awareness of the importance of Start-up increases, the number of entrepreneurs who decide to start their career is gradually increasing. However, the rate of start-up failure is still high and the qualitative level is very low due to lack of start-up performance. In this study, we analyzed the effect of entrepreneurship capability and start-up support system on start-up performance. To that end, 361 valid data were collected from businesses that were established less than seven years ago in Jeollabuk-do on August 1, 2018 and used for study verification through SPSS 21 and AMOS 21. First, the entrepreneurial competence (entrepreneurial competence, managerial competency) has a positive effect on the start-up support system and the technical competency has no significant effect. Second, entrepreneurial competence (entrepreneurial competence, managerial competency, technical competency) has a significant effect on entrepreneurial performance. However, entrepreneurial competence has a meaningful effect on the start-up performance of entrepreneurs with a negative (-) effect. Third, it was found that the start - up support system had a positive effect on the start - up performance. Finally, the start - up support system proved to have mediating effect between entrepreneurial competence and start - up performance. The implications of this study are as follows. In order to increase the start-up performance of the start-up companies, it is proved that increasing the capacity of the start-ups is an important factor. In addition, empirical studies have proved that the use of start-up support system is an important factor that directly or indirectly has a significant effect on start-up performance, We have made meaningful implications that actively supporting and utilizing entrepreneurship is necessary to enhance start-up performance.

• Journal of the Korean Association of Geographic Information Studies
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• v.24 no.4
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• pp.148-163
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• 2021

The diversification of the New Deal urban regeneration projects, that started in 2017 in accordance with the "Special Act on Urban Regeneration Activation and Support", generated the increased demand for the accuracy of data-driven diagnosis and project type forecast. Thus, this research was conducted to develop an application model able to identify the most appropriate New Deal project type for "eup", "myeon" and "dong" across the country. Data for application model development were collected through Statistical geographic information service(SGIS) and the 'Urban Regeneration Comprehensive Information Open System' of the Urban Regeneration Information System, and data for the analysis model was constructed through data pre-processing. Four models were derived and simulations were performed through polynomial regression analysis and multinomial logistic regression analysis for the application of the appropriate New Deal project type. I verified the applicability and validity of the four models by the comparative analysis of spatial distribution of the previously selected New Deal projects by targeting the sites located in Seoul by each model and the result showed that the DI-54 model had the highest concordance rate.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.125-125
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• 2022

저수지 운영자료는 다목적 댐 경우와 마찬가지로, 유입량, 저수량, 방류량 자료로 구성된다. 여기에 강우량을 포함하여, 실시간으로 관리돼야 한다. 그러나 우리나라 저수지는 저수율 자료만 관리하고 있다. 유입량, 방류량이 없는 것이 아니고 관리를 하지 않는다. 강우량은 전혀 없다. 큰 문제인데, 아직도 그 심각성을 모르고, 대충하면 되는 줄 알고 있다. 가장 기초가 되는 일을 무시하고 물관리를 하고 있는 상황이고, 누구도 그 신뢰성을 믿지 않고 있다. 여기서는 이를 해결하는 방안으로 준 실시간 물수지 모형을 구축하여, 10분 단위, 30분 단위, 1시간 단위로 저수위, 저수량, 유입량, 방류량, 강우량을 연속하여 생산하고 검증하는 체제를 제시한다. 준 실시간의 뜻은 계산에 의하지 않고 유입량을 모의에 의해 적용하고 검증하는 과정이 필요하여, 실시간 보다 하루 이틀 늦게 자료를 생산한다는 의미다. 대상 저수지는 유역 내 강우량 수집이 가능한 유역면적 218.80km², 유효저수량 3,494만m³, 수혜면적 5,117 ha인 탑정지를 선정했다. 탑정지 방류량은 탑정1(폭 7.5m×높이 1.5m), 탑정2(4m×1.6m), 양수장(3m×1.6m) 수로로 관개용수 공급량과, 9연의 수문(9m×7.5m)으로 홍수기 방류량으로 구성된다. 분석기간은 1월1일부터 1시간 단위로 연속하여 기간은 자유롭게 설정하여 검정하는 체제를 갖추고 검증된 결과를 제시토록 했다. 2021년 9월의 1시간 단위의 탑정지 저수지 물수지 모의 결과를 요약하면 다음과 같다. 첫째, 탑정지 유역의 환경부 관리 장선, 양촌, 연산 관측소의 면적우량은 최대 15.3mm, 총 160.4mm(3,510만m³)였고, ONE 모형에 의해 연속유량을 모의한 결과, 유입량은 최대 35.6m³/s, 총 1,464만m³로 유출률 41.7%였다. 둘째, 탑정1, 탑정2, 양수장 수로의 수위자료에 수위-유량 관계식을 적용해 수로유량을 산정한 결과 합하여 최대 16.8m³/s였고, 총 548만m³였으며, 수문 방류량은 최대 20.0m³/s였고, 총 108만m³였다. 셋째, 저수지 수위는 관측수위는 EL.28.21~29.38m, 평균 EL.28.87m, 모의수위는 EL.28.08~29.62m, 평균 EL.28.80m로 나타났고, R²는 0.910로 만족한 결과를 얻었다. 정리하면 저수지 운영자료가 없는데도, 10분, 1시간 단위로 연속으로 유입량, 저수량을 모의하여 관측저수량과 비교한 결과가 괄목할 신뢰도를 나타냈다. 이를 바탕으로 저수량, 유입량, 방류량, 강우량 등 준 실시간 저수지 운영자료 생산체제를 마련한 것으로 결론을 내렸다.

• Journal of Venture Innovation
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• v.7 no.1
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• pp.59-75
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• 2024

As the 4th Industrial Revolution progresses, the importance of startups was increasingly emphasized. Nevertheless, the five-year survival rate of Korean startups was lower than that of OECD countries. In this study, we analyzed the relationship between agile leadership, learning agility, and organizational performance of startups under the premise that organizational performance was most important for startups to achieve sustainable growth. For the empirical analysis, agile leadership was set as an independent variable, learning agility was set as a mediating variable, and organizational performance was set as a dependent variable. Data was collected from startup employees across the country, and 197 valid samples were selected for analysis. The empirical analysis used Process Macro 4.2. As a result of the empirical analysis, agile leadership was found to have a significant positive effect on startup organizational performance. Additionally, agile leadership had a positive (+) effect on learning agility, and learning agility had a positive (+) effect on startup organizational performance. As a result of analyzing the mediating effect of learning agility, learning agility was found to play a mediating role between agile leadership and organizational performance. Academically, these research results tested the usefulness of agile leadership suited to the startup culture among various leadership styles that can improve the organizational performance of startups. In practical terms, such agile leadership not only directly affects organizational performance, but also through the learning agility of startup employees. This means that by creating a culture of learning agility that encourages startup employees to continuously learn and adapt, startups can increase their chances of survival and success.

• Journal of Korean Home Economics Education Association
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• v.19 no.3
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• pp.61-76
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• 2007

The purpose of the study is to identify and understand problems existing in the middle school home economics practice rooms in Jeju Special Self-Governing Province. The findings are based on the examination and the analysis of the indoor environment and the condition of the facilities and equipment. Study method employs on-site research and a survey. The on-site research was conducted about temperature, humidity, intensity of illumination, and status of teaching instrument in 10 out of 41 middle schools in Jeju Special Self-Governing Province from August 16 to September 30, 2006. Meanwhile, the survey was implemented by mail for 95 teachers in charge of manual training and home economics education in 41 middle schools in Jeju from November 1 to 23, 2005. 64 questionnaires out of total 95 were collected, including those collected during the period of on-site research. Finally, 61 questionnaires which were effective among the answered ones were used for analysis. Collected materials were analyzed with the SPSS Win.12.0 program for frequency, percentile analysis. In conclusion, the study determines that the condition of the home economics practice rooms of the middle school in JSSGP in terms of temperature, humidity, lighting and ventilation is very inadequate. The structure of the practice room represents an inefficient work flow pattern. Further, the facilities and equipment are in a very poor condition because the facilities are old and the retention rate of teaching tools is low. Therefore, to address these problems, the study suggests that improvements on the facilities and equipment should be made and teaching tools should be replenished in accordance with the industry standard.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.11 no.4
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• pp.1-15
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• 2016

Startups in Korea are experiencing for themselves the laws of survival through competition in the local and international market, and are performing active business movements based on these. Korea's economic growth rate is 2.6% due to the slump in the domestic demand and reduced exports brought by the MERSC incident in 2015. The Korea Development Institute has estimated the economic growth rate in 2016 to be around 3.0%. South Korea's economy is facing the crisis of low-growth solidification due to the decrease in economic growth, and it is forecasted that growth without employment and polarization will worsen. Startups in the high-tech industrial generation of a particular field wherein the market environment is rapidly changing must maintain a competitive advantage with the capabilities and functions exclusive to them. It is very important that they maintain a competitive edge by utilizing the capabilities exclusive to startup companies. Likewise, the accumulation of resources is also crucial in determining the success of a startup business. In a poor local startup ecosystem, majority of the startup companies are performing their business activities while striving for survival, rather than success. About 80% are struggling to survive and are failing to overcome the "Death Valley" faced 3-5 years after establishing the company. Since majority of the startups fail to achieve results during the initial stages of foundation, the importance of research on business activities and achievement during the early stages of establishment is being raised. In accordance to this, this research has performed an actual analysis on how the activities of startups during their preparation phase and early stages affect their achievements. A survey was done on the CEOs or executives (people in a position to make decisions) of local small and medium-sized enterprises that are considered start-ups, and 203 valid data were collected and analyzed. Results showed that the discoveries and utilized activities necessary for the businesses of startups have a significant impact on their achievement through the entrepreneur resources and external partners' cooperation; additionally, the related implications were discussed.