• 분석과학
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• 제35권2호
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• pp.69-81
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• 2022

The method of measuring and classifying the energy category of neutrons directly using raw data acquired through a CZT detector is not satisfactory, in terms of accuracy and efficiency, because of its poor energy resolution and low measurement efficiency. Moreover, this method of measuring and analyzing the characteristics of low-energy or low-activity gamma-ray sources might be not accurate and efficient in the case of neutrons because of various factors, such as the noise of the CZT detector itself and the influence of environmental radiation. We have therefore developed an efficient method of analyzing radiation characteristics using a neutron and gamma-ray analysis algorithm for the rapid and clear identification of the type, energy, and radioactivity of gamma-ray sources as well as the detection and classification of the energy category (fast or thermal neutrons) of neutron sources, employing raw data acquired through a CZT detector. The neutron analysis algorithm is based on the fact that in the energy-spectrum channel of 558.6 keV emitted in the nuclear reaction ¹¹³Cd + ¹n → ¹¹⁴Cd + in the CZT detector, there is a notable difference in detection information between a CZT detector without a PE modulator and a CZT detector with a PE modulator, but there is no significant difference between the two detectors in other energy-spectrum channels. In addition, the gamma-ray analysis algorithm uses the difference in the detection information of the CZT detector between the unique characteristic energy-spectrum channel of a gamma-ray source and other channels. This efficient method of analyzing radiation characteristics is expected to be useful for the rapid radiation detection and accurate information collection on radiation sources, which are required to minimize radiation damage and manage accidents in national disaster situations, such as large-scale radioactivity leak accidents at nuclear power plants or nuclear material handling facilities.

• 한국엔터테인먼트산업학회논문지
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• 제13권7호
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• pp.441-448
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• 2019

본 연구는 경도 인지장애 환자들이 병원을 선택하는 기준에 대해 알아보고자 실시하였다. 연구는 2018년 5월 1일부터 9월 30일까지 연구참여에 동의한 36명을 대상으로 설문을 실시하였다. 자료수집은 재활병원과 요양병원에 입원한 환자를 대상으로 하였으며 K-MMSE를 이용하여 인지 선별평가를 시행하고, 병원선택요인 도구를 본 연구에 맞게 수정 보완하여 사용하였다. 연구의 결과를 종합해보면 거주지 또는 직장과의 거리가 가깝고 교통용이, 간편한 행정적 절차, 병원의 유명도, 새로운 서비스, 물리치료와 작업치료 등과 관련된 서비스 등이 경도 인지장애 환자의 병원 선택에 영향을 미쳤다(p<.05). 본 연구의 결과를 토대로 증가하는 경도 인지장애 환자의 병원 내원을 대비하여 임상가들과 환자를 유치하는 의료기관의 마케팅 전략에도 변화가 필요할 것이라 사료된다.

• 임상간호연구
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• 제15권2호
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• pp.77-89
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• 2009

Purpose: The purpose of this study was to compare maternal perceptions between two groups of postpartum women, women who chose to have their babies room-in and women who did not (non rooming-in group). Methods: Data collection was conducted in 37 hospitals from August 10 to September 20, 2008. The participants were 209 mothers opting for rooming-in and 128 mothers for non rooming-in. The women completed a questionnaire which included the Edinburgh postpartum depression scale, maternal attachment inventory, and postpartum self-evaluation questionnaire. Results: There were significant differences in education level, income and antenatal education between the rooming-in and non rooming-in groups. The rooming-in group also showed higher levels of satisfaction with medical services. More important, the rate of breast feeding for the rooming-in group was higher than for the non rooming-in group. There was no difference between the two groups for postpartum depression, maternal attachment and mothers' confidence with infant care tasks. Conclusion: These findings suggest that rooming-in system has more advantages compared to non rooming-in and that it can help to promote breast feeding. The authors recommend that the rooming-in system be expanded nationwide. The results of this research can be used to assist the development of future rooming-in system expansion strategy.

• 예술인문사회 융합 멀티미디어 논문지
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• 제5권4호
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• pp.435-442
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• 2015

본 연구의 목적은 논리모델을 통해 다문화학생 멘토링 사업의 효과를 검증하는데 있다. 연구대상은 2014년 다문화 멘토링 사업에 참여한 I 대학교 멘토 40명에게 논리모델의 투입, 활동, 산출, 성과 등 네 단계에 따라 구성된 혼합형 질문지로 조사하여 내용분석 및 분류분석을 활용하여 자료를 분석하였다. 연구결과 첫째, 투입단계에서 멘토링 프로그램 홍보, 선발과정, 매칭 방법, 사전교육, 활동비 등에 대해 대부분 적당하다고 응답하였다. 둘째, 활동단계를 보면 멘토와 멘티의 첫 만남은 교사와 함께 이루어진 것으로 나타났다. 그리고 멘토링 활동은 80%가 학습지도로 진행되었으며, 인성지도와 체험활동이 부족한 것으로 나타났다. 셋째, 산출단계에서는, 대부분의 멘토가 멘토링 활동 시간, 기간, 장소가 적당하다고 응답했다. 마지막으로, 성과단계는 멘토와 멘티의 인지적, 정서적, 행동적 측면에서 향상된 것으로 나타났다. 본 연구결과를 통해 멘토링 사업에 대한 체계적인 효과 검증이 가능하고, 향후 진행하게 될 사업을 위한 개선점을 얻을 수 있을 것으로 기대한다.

• 패션비즈니스
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• 제27권5호
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• pp.121-134
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• 2023

With the development of information and communication technology, interest in new educational approaches that can enhance the learning performance of learners with improved information literacy skills is increasing, and universities are actively promoting educational innovation to foster the talents required by society. In the field of fashion studies education, which is closely related to the fashion industry, there is a strong need to develop field-linked educational programs that reflect the trends in the industry and changes in the educational system. The purpose of this study was to introduce industry-coupled problem-based learning (IC-PBL) to the course "Understanding Fashion Consumption Trends" for non-fashion majors to reflect the current needs and strengthen the educational effectiveness of the learners through a survey. A seven-step curriculum (introduction to the class, practitioner's problem, learner's problem analysis, organizing concepts related to variables, information collection and scenario writing, presentation and scenario proposal, and evaluation) not only enhanced learners' understanding of fashion consumption trends and the fashion industry but also greatly amplified learners' satisfaction with the class. The results of the survey showed that the seven-step curriculum was effective in increasing learners' self-directed learning ability, problem-solving ability, and confidence in learning. Self-directed learning ability was stronger than other factors, consistent with the core principle of problem-based learning to empower learners to take the initiative and promote self-directed learning. Each factor analyzed was positively correlated.

• Journal of Positioning, Navigation, and Timing
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• 제12권4호
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• pp.437-445
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• 2023

A space system refers to a network of sensors, ground systems, and space-craft operating in space. The security of space systems relies on information systems and networks that support the design, launch, and operation of space missions. Characteristics of space operations, including command and control (C2) between space-craft (including satellites) and ground communication, also depend on wireless frequency and communication channels. Attackers can potentially engage in malicious activities such as destruction, disruption, and degradation of systems, networks, communication channels, and space operations. These malicious cyber activities include sensor spoofing, system damage, denial of service attacks, jamming of unauthorized commands, and injection of malicious code. Such activities ultimately lead to a decrease in the lifespan and functionality of space systems, and may result in damage to space-craft and, lead to loss of control. The Cybersecurity Adversarial Tactics, Techniques, and Common Knowledge (ATT&CK) matrix, proposed by Massachusetts Institute of Technology Research and Engineering (MITRE), consists of the following stages: Reconnaissance, Resource Development, Initial Access, Execution, Persistence, Privilege Escalation, Defense Evasion, Credential Access, Discovery, Lateral Movement, Collection, Command & Control, Exfiltration, and Impact. This paper identifies cybersecurity activities in space systems and satellite navigation systems through the National Institute of Standards and Technology (NIST)'s standard documents, former U.S. President Trump's executive orders, and presents risk management activities. This paper also explores cybersecurity's tactics attack techniques within the context of space systems (space-craft) by referencing the Sparta ATT&CK Matrix. In this paper, security threats in space systems analyzed, focusing on the cybersecurity attack tactics, techniques, and countermeasures of space-craft presented by Space Attack Research and Tactic Analysis (SPARTA). Through this study, cybersecurity attack tactics, techniques, and countermeasures existing in space-craft are identified, and an understanding of the direction of application in the design and implementation of safe small satellites is provided.

• 한국전자통신학회논문지
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• 제18권6호
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• pp.1239-1244
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• 2023

본 연구에서는 캔/PET병 압착파쇄기를 관리하기 위한 IoT 기반의 관리시스템을 개발하였다. 로드셀 2개, 온습도센서 DHT22, 미세먼지 지측정기 등 다양한 센서를 ESP32와 인터페이스하여 IoT 디바이스를 구성하였으며, Node-RED를 활용하여 관리 서버를 구축하였다. 본 시스템은 압착캔과 파쇄된 PET병의 무게를 실시간으로 모니터링하고, 미리 정한 기준치를 초과할 경우 관리자에게 문자 메시지를 전송하여 적시에 수거할 수 있도록 하였다. 운영 시험 결과 본 시스템은 정확한 모니터링과 효율적인 알림 기능을 제공함을 확인하였으며 캔/PET병 과 같은 폐기물 관리의 효율성을 제고하여 환경 문제를 해결할 수 있는 가능성을 제시하였다.

• 한국ITS학회 논문지
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• 제23권1호
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• pp.97-111
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• 2024

개발도상국 및 소규모 지자체는 재정적인 여건이 불리하여 자체 버스정보시스템 도입에 한계가 있다. 하지만, 개발도상국은 열악한 사회 인프라 및 낮은 소득 수준에도 불구하고, 스마트폰의 보급률이 높으며, 온라인 콘텐츠, 소셜 미디어 보급 및 사용률이 매우 높은 실정이다. 스마트폰은 GPS 센서, 카메라 등 위치기반의 정보 수집 및 정보의 제공이 가능하기 때문에 고가의 현장 단말기를 대체할 수 있다. 본 연구는 고가의 현장단말기를 스마트폰으로 대체하고, 센터시스템은 클라우드 서버 기반으로 개발함으로써, 어디에나 적용 가능한 확장형 Open BIS 서비스 제시 및 플랫폼을 개발하고, 비즈니스 모델을 수립하는 것을 목적으로 한다.

• 대한의용생체공학회:의공학회지
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• 제45권3호
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• pp.109-117
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• 2024

We developed a device that integrates digital otoscope and stethoscope for telemedicine. The integrated device was utilized for the collection of tympanic membrane images and cardiac auscultation data. Data accumulated on the platform server can support real-time diagnosis of heart and eardrum diseases using artificial intelligence. Public data from Kaggle were used for deep learning. After comparing with various deep learning models, the MobileNetV2 model showed superior performance in analyzing tympanic membrane data, and the VGG16 model excelled in analyzing cardiac data. The classification algorithm achieved an accuracy of 89.9% for eardrums data and 100% for heart sound data. These results demonstrate the possibility of diagnosing diseases without the limitations of time and space by using this platform.

• 한국도서관정보학회지
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• 제20권
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• pp.317-349
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• 1993

The purpose of this study lies in identifying Korean scientists' dependency on foreign scientific and technical information (STI), with emphasis on investigating the causes and results. Especially, this study intends to investigate the impacts that a growing dependency on foreign STI might have brought and will bring about on the development of indigenous STI in ROK. To the end, the present discussion covers the following specific research questions: 1) what are the major information sources used by Korean scientists to locate STI necessary for research-related activities\ulcorner 2) to what extent do Korean scientists use foreign STI for research-related activates, as compared to the use of domestic STI\ulcorner 3) what are the major factors causing the information dependency among Korean scientists and what are the results of the growing information dependency\ulcorner And finally, 4) what suggestions can be made for ROK to further its indigenous STI development, while minimizing its dependency on foreign STI\ulcorner Survey method, together with citation analysis method, is employed as the major data collection technique. The survey sample consists of 167 most 'representative' Korean scientists selected on the basis of their research productivity. 167 specially-designed questionnaires were mailed and 104 out of 167 were responded. Follow-up interviews were carried out for 32 out of 104 respondents, who returned the questionnaire but did not answer some specific questions. The data collected from these 104 respondents were analyzed on the basis of two distinguished groups namely, junior and senior scientist groups. Among the 104 respondents, 58 a n.0, ppeared to belong to a group of senior scientists (older than age 45 and finished their final degrees since 1980), and 46 belonged to a group of junior scientists (younger than age 45 and finished their final degrees before 1980). The major findings of the present study include: 1) Korean scientists regard 'scientific and technical journals and books'as the most important information source to obtain the recent STI; 2) their dependency on foreign STI, for the purposes of research and teaching, is extremely high (information dependency for research activities is 88.5%, and that for teaching activities 91.2%); 3) the information dependency of junior scientists are higher than that of senior scientists; 4) Korean scientists' growing information dependency is closely related to both small quantity and low quality of domestically-produced STI, and has a statistically significant relationship with their educational background; and finally, 5) in order to theoretically explain the growing information dependency of Korean scientists, a hypothesis - 'chronic cycle of information dependency' was developed and introduced. The present study suggests the promotion of indigenous STI as a desirable alternative to escape from the 'chronic cycle of information dependency. Localization of the imported foreign STI is suggested as a good strategy for the indigenous STI development, and also suggested are STI policies for both success of localization process and promotion of more efficient STI flows at national and international level.