• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.677-678
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• 2009

USB메모리의 분실 및 도난을 통하여 개인정보 유출 사건이 증가함에 따라 보안USB 솔루션이 개발되어 사용자들에게 제공되고 있다. 이러한 보안USB 솔루션은 비밀번호를 기반으로 사용자 인증을 제공 하고 있어 비밀번호 분실 시 보안영역에 접근할 수 없는 불편함을 가지고 있다. 이를 해결하기 위해 여러 보안USB 솔루션에서 서버를 이용한 비밀번호 백업/복구 서비스를 제공하지만 이 또한 네트워크에 연결되어 있지 않은 클라이언트에서 비밀번호를 변경 시 변경된 비밀번호가 서버에 동기화 되지 못하는 문제가 발생되고 있다. 따라서 본 논문은 Off-Line 환경에서 변경된 비밀번호를 USB메모리에 안전하게 저장한 뒤 On-Line 환경으로 변경 시 변경된 비밀번호를 서버와 동기화 하는 방법을 제시한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.539-540
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• 2023

최근 물체 인식 모델의 성능을 개선하기 위한 다양한 연구가 진행 중이다. 본 논문에서는 K-means 기반 앵커박스 선정 기법을 적용한 새로운 물체 인식 모델 성능 개선 방법을 제안한다. 제안된 방법은 항만 내 설치된 컨테이너 사고를 예방하기 위한 컨테이너 사고위험도 분류 모델에 적용하여 성능 평가를 하였다. 특히, 컨테이너 사고위험도 분류 모델은 작은 물체를 인식해야 하며 이런 환경에서는 기존 물체 인식 모델 성능이 낮게 나타난다. 본 논문에서는 제안한 K-means 기반 앵커박스 선정 기법을 적용하여 물체 인식 모델 성능이 개선됨을 확인하였디.

• Proceedings of the Korean Society of Disaster Information Conference
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• 2022.10a
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• pp.171-172
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• 2022

건설현장에서 작업환경측정을 하고 있으나 노출되고 있는 유해인자를 세분화하여 작업환경측정을 하지 않고 공정별 대표적으로 노출되는 소음, 진동 등 몇 가지만 실시하고 있다. 이에 건설현장에서 가장 많이 노출되는 산화규소분진의 유해성과 현재 건설현장에서 하고있는 개선대책의 보완점을 찾고자 한다. 연구방법: 안전보건공단과 산업보건협회에서 발행하는 실태조사 보고서 및 작업환경측정 기관의 자료를 활용하여 현황을 분석하였고 산업안전보건법의 작업환경측정에 관한 규칙과 비교 분석 하였다. 연구결과: 산화규소분진의 유해성을 파악하고 개선책을 보완도출하였다. 결론: 건설현장의 산화규소분진의 유해성을 도출하고 이에 따른 개선대책을 제시함으로써 현장에서 적극적으로 적용한다면 산화규소분진에 대한 직업병을 줄일 수 있을 것으로 기대된다.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.11a
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• pp.959-960
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• 2023

본 연구에서는 수중 환경 정보 수집과 수집된 환경 정보를 쉬운 인터페이스 환경 구축하고자 부력제어 방식의 수중 드론을 제작하고 수중 지형 지물의 로드뷰 제작 기법을 개발 수행한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.11a
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• pp.382-385
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• 2023

Spark는 대용량의 데이터를 처리를 위해 분산된 데이터를 네트워크로 모은 다음, 데이터를 분할하는 작업인 Shuffle을 진행한다. 이때 Spark 클러스터의 어느 한 노드의 네트워크 전송 속도가 느릴 경우 병목 현상으로 인한 전체 처리 성능이 저하된다. 이에 본 논문에서는 네트워크 병목 현상을 예방하기 위한 클러스터 구성 방법을 제안한다. 본 논문에서 제안하는 노드 선택 시스템은 iperf 도구를 이용해 노드들의 대역폭을 측정하고 이에 따라 노드 선택 알고리즘을 통해 클러스터를 구성한다. 기존 Spark 클러스터와 본 논문이 제안하는 시스템으로 구성한 클러스터를 비교했을 때, 250MB 로그 파일을 제외하고 750MB 로그 파일부터는 네트워크 전송 속도가 낮은 노드를 가지고 있는 클러스터의 성능이 병목 현상으로 인해 느려졌다. 본 논문의 제안에 따라 노드들의 네트워크 전송 속도를 고려하여 클러스터를 구성하면 네트워크 전송 속도로 발생하는 병목 현상을 예방할 수 있다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.18 no.4
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• pp.1075-1089
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• 2024

In this paper, the optimizations of multi-hop cooperative molecular communication (CMC) system in cylindrical anomalous-diffusive channel in three-dimensional enviroment are investigated. First, we derive the performance of bit error probability (BEP) of CMC system under decode-and-forward relay strategy. Then for achieving minimum average BEP, the optimization variables are detection thresholds at cooperative nodes and destination node, and the corresponding optimization problem is formulated. Furthermore, we use conjugate gradient (CG) algorithm to solve this optimization problem to search optimal detection thresholds. The numerical results show the optimal detection thresholds can be obtained by CG algorithm, which has good convergence behaviors with fewer iterations to achieve minimized average BEP compared with gradient decent algorithm and Bisection method which are used in molecular communication.

• Journal of Korean Public Health Nursing
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• v.4 no.2
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• pp.79-99
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• 1990

This study was conducted to identify the family problems of the in-patients and to analize factors Influencing to the family problems. The subjects for this study were 277 family members those who were giving care for the adult patients during hospitalized in general wards at Seoul National University Hospital in Seoul. Data were collected through interviews with the questionnaire from September second to September twentieth in 1989. The instrument used for this study was the family problems scale which was developed by the researcher. Analysis of data was done by frequency, percent, mean, t-test, ANOVA, Pearson-Correlation Coefficients, and Stepwise Multiple Regression Analysis. The results of this study are summarized as follows: 1. General characteristics of the care-giver in family. The average age of care-givers was 37.9 years, and the $26.4\%$ of monthly Income of family was 310,000-500,000 won group. The $93.5\%$ of family had taken the responsibility of caring for the patients instead of hiring the care-givers, and the $12.3\%$of the care-givers complained weakning of health status during care giving for the patients. The spouse took the largest part of responsibility of the care-giving services to the patient among the family members. 2. General characteristics of the patients. The average age of patient was 47 years, and the $80.9\%$ of patient was married status. The $39\%$ of patient was father in the position of family, and the $41.5\%$ had the responsibility to support their family before hospitalization. The average hospitalization period of patient was 24.3 day and the $50.9\%$ had admission experience. 3. The factors of family problems which were faced by the family were classified into six problems. The factors of family problems were ranked as follows; the first rank problem was related to care-giving for the patients. the second problem was resulted from the patients diseases, the theirds problem was related with adaptation to the hospital enviroments, the fourth problem was related to the arisen conflicts with medical team. the fifth problem was related to the change of family function. and the sixth problem was the financial problem. 4. The relationship between the family problems and the general charateristics of the care-givers showed that the nuclear type family was higher the family problems, that the admission period of patients became longer, and that the family who had the worse condition of health status of the care givers during care giving for the patients. From the above results, it was confirmed that the family care giving for patients was faced with some problems resulted from patient's illness, relation to the medical team, adaptation to the hospital enviroment, financial problem. change of family function, and care-giving for patients.

• Journal of the Korean Society for Environmental Technology
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• v.19 no.6
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• pp.586-599
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• 2018

To learn about the discharge facility management of industrial complexes and the discharge characteristics of water pollutants in drainage, 11 sites were selected, including 16 discharge companies of Hanam Industrial Complex and High-Tech Scientific Industrial Complex and 4 drainages of the industrial complexes. Through the analysis, it was found that 12(75 %) of the 16 discharge companies had specific hazardous substances other than those registered at the time of installation and registration of the wastewater discharge facilities. In terms of other pollutants, 11 of the 16 companies(about 69 %) were found to have pollution items that differed from those included in approved and reported items lists. In addition, Formaldehyde, Mn, Zn, and Ba were discharged from 11 out of the 16 companies. Significantly, one of the specific hazardous water pollutants, Cu, was detected in all discharge facilities at levels from 0.029 to 0.929 mg/L. Even in major complexes drainages and the main stream of the Yeongsangang. As, Dichloromethane, and Chloroform were detected. However, it cannot be conclusively claimed that it is probable that these substances were actually discharged from the above facilities because research was only done in a limited range(Class 1 to Class 3), and therefore, further research is required. In the future, it will be necessary to expand the research scope of the discharge companies in order to establish a database of water pollutants, and to improve permits and reported items based on discharged substances.

• The Journal of the Korea Contents Association
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• v.22 no.4
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• pp.231-245
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• 2022

Most humans live at work and continue their lives through work. This study aims to understand the influence of job crafting on job satisfaction and knowledge sharing behavior, innovation behavior, and smart work environment variables in the rapidly changing labor market. In addition, a study was conducted on the effect of job crafting on job satisfaction by dividing it into male and female groups. The study was conducted on 453 office workers who responded to the survey, and SPSS 26.0 and Amos 26.0 were used. Frequency analysis, exploratory factor analysis, confirmatory factor analysis, reliability analysis, descriptive statistics, correlation, structural model analysis and Multi-group analysis were performed. Multiple mediating effects were analyzed and Process macro model 7 was used as the smart work environment effect. As a result of the analysis, first, job crafting had a significant effect on job satisfaction, and second, job crafting had a significant effect on knowledge sharing behavior and innovation behavior. Third, knowledge sharing behavior had a significant effect on job satisfaction, but innovation behavior did not affect job satisfaction. Fourth, for the parameters of knowledge sharing behavior and innovation behavior, knowledge sharing behavior had a partial mediating effect, but innovation behavior did not affect it. Fifth, it was found that the moderating effect of the smart work environment had no effect, and sixth, the results of a study on the effect of job crafting on job satisfaction divided into men and women had a greater effect than men.

• Journal of Korean Society on Water Environment
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• v.39 no.2
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• pp.142-152
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• 2023

Infiltration is a process by which precipitation infuses into subsurface soils. The process determines the surface flow and baseflow volume, and it is one of most important hydrological processes regarding nonpoint source pollution management. Therefore, the Ministry of Environment has developed a guideline to determine the impervious area ratio to understand the hydrological process in administrative districts and watersheds. The impervious area ratio can be determined using land use or land cover maps. Three approaches were explored to determine the impervious area ratio in 25 districts in Seoul. The impervious area ratio was determined by employing the Land registration map and Land property data in the first approach, Land property map in the second approach, and Land cover map in the third approach. The ratio ranged from 38.96% to 83.01% in the first approach, 38.98% to 83.02% in the second approach, and 37.62% to 76.63% in the third approach. Although the ranges did not provide any significant differences in the approaches, some districts displayed differences up to 9.48% by the approach. These differences resulted from the fact that the data were land use or land cover, especially in the area of airport, residential complex area, and school sites. In other words, division of the pervious and impervious areas in an individual plot was not allowed in the Land registration map, while it was allowed in the Land cover map. Therefore, it was concluded that there is a need to revise the guideline so that a reasonable impervious area ratio can be determined in the districts.