• 한국안전학회지
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• 제32권2호
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• pp.72-77
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• 2017

In S. Korea, recently, building fire accidents of residential accommodations or recreational facilities have taken place more frequently than before. Among various building constructions, Multi-layered structure, such as office-residential complex, are mostly made in S. korea. $O_2$, $CO_2$, CO, $NO_x$, $SO_x$, and HCl, these gases has toxic hazard and harmful for human body. And it is predicted that different concentration of released gases from diesel pool fire with upper and lower layer. Therefore, this study reports the fire characteristics of Multi-layered structure by analyzing the fire behavior and concentration of combustion gases of a experimental compartment via real scale fire experiment, in order to predict risks and secure safety for similar fire accidents.

• Journal of Electrochemical Science and Technology
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• 제2권4호
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• pp.204-210
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• 2011

Thin film electrodes have been intensively studied for active materials and current collectors to enhance the electrochemical performance. Here, porous structures of nickel-based oxide films, consisting of nickel oxide and copper (II) oxide, which was derived from the copper substrate during the annealing process, were deposited on metallic copper foils. The half-cell tests revealed excellent capacity retention after $80^{th}$ charge/discharge cycles. Some films showed an excess of the theoretical capacity of nickel oxides, which mainly originate from partially oxidized copper substrates during annealing. These results exhibit that both a preparation method of an active materials and partially oxidized current collectors could be important roles to apply thin film electrodes.

• 대한임베디드공학회논문지
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• 제13권2호
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• pp.101-107
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• 2018

As indoor pollutants such as carbon dioxide and dust mainly affect the respiratory and circulatory systems, there is an increasing need for real-time indoor / outdoor environmental monitoring. In this paper, we have developed a real - time environmental monitoring system using the cloud-based 3G integrated environmental sensor module for environmental monitoring. A highly reliable environmental information monitoring system requires various IT technologies such as infrastructure (server, commercial software, etc.), service application software, security, and authentication. A real-time environment monitoring system based on cloud service that can provide reliable service satisfying these configuration requirements is proposed and implemented. It is expected that this system can be applied to various technologies such as indoor automatic window opening/closing system based on the Internet.

• Journal of information and communication convergence engineering
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• 제17권1호
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• pp.84-90
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• 2019

Applications of unmanned aerial vehicles (UAVs) in the military environment have become popular because they require minimum human contribution and can avoid accidents during missions. UAVs are employed in various missions such as reconnaissance, observation, aggression, and protection. Consequently, counter-measures, known as anti-drone technologies, have been developed as well. In order to protect against threats from anti-drone technologies and enhance the survivability of UAVs, this study proposes an evasive measure. The proposed bio-inspired evasive maneuver of a UAV mimics a dragonfly's irregular flight. The unpredictable UAV movement is able to confuse enemies and avoid threats, thereby enhancing the UAV's survivability. The proposed system has been implemented on a commercial UAV platform (AR Drone 2.0) and tested in a real environment. The experiment results demonstrate that the proposed flight pattern has larger displacement values compared to a regular flight maneuver, thus making the UAV's position is difficult to predict.

• 한국실내디자인학회논문집
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• 제25권6호
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• pp.15-22
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• 2016

Recent changes in the Korean education policies are promoting the advances in science and technology and cultivating people of convergence talent. STEAM (science, technology, engineering, art and math) educational program is Korean styled convergence program for creative competent human resources. Therefore, Therefore the aim of this study is developing convergence hand-on educational program coping with climate change for elementary school students. For development of the program, we investigated the curriculum of the elementary school about the climate change, and allocated in the creative learning standard frame. Also, we selected themes related the climate change in the curriculum and learning activity. For more effective program to build the convergence competency, we analyzed the program based on creative problem based learning process and 4 core competency(creativity, communication, convergence, caring) elements. In conclusion, the STEAM program needs to develop by school curriculum and leaner's ability. For elementary school students, the STEAM program consists with creative problem based learning process. And the convergence educational program would analyze by the creative PBL process and convergence competency elements. So, this developing program has brought the promotion of the creative convergence competent talented person for the future global environment.

• 한국융합학회논문지
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• 제11권2호
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• pp.23-28
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• 2020

본 연구는 치과위생사의 조직몰입도, 내부역량, 근무환경의 연관성을 알아보고자 한다. 연구대상자는 2019년 5월~10월 까지 대구, 경북 일부 지역의 치과위생사 245명에게 설문 조사를 실시하으며, SPSS 21.0 프로그램을 이용하여 기술통계, ANOVA, Pearson's 상관계수로 분석하였다. 연구결과 조직몰입도, 내부역량, 근무환경 관련성 결과에서는 양(+)의 상관관계를 보여 치과위생사의 조직몰입도가 높을수록 개인의 내부역량이 높고 근무환경이 좋은 것으로 나타났다. 본 연구는 의료기관에서 치과위생사의 조직몰입도 및 내부역량을 향상시킬 수 있는 방안을 제시하였으며, 치과병(의)원의 근무환경을 개선시킬 수 있는 프로그램 개발의 필요성을 제언한다.

• Bulletin of the Korean Chemical Society
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• 제32권2호
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• pp.613-619
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• 2011

Colloidal silver nanoparticles (AgNPs) have been commercialized as the typically stabilized form via the addition of a variety of surfactants or polymers. Herein, to examine the effects of stabilizing AgNPs in suspension, we modified the surface of bare AgNPs with four type of surfactants (NaDDBS, SDS, TW80, CTAB) and polymers (PVP, PAA, PAH, CMC). The modified AgNPs was applied to compare suspension stability and nanotoxicity test using Escherichia coli (E. coli) as a model organism. Modification of AgNPs surface using chemical stabilizer may be not related with molecular weight, but chemical structure such as ionic state and functional group of stabilizer. In this study, it is noteworthy that AgNPs modified with a cationic stabilizer (CTAB, PAH) were importantly toxic to E. coli, rather than anionic stabilizers (NaDDBS, SDS). Comparing similar anionic stabilizer, i.e., NaDDBS and SDS, the result showed that lipophilicity of chemical structure can affect on E. coli, because NaDDBS, which contains a lipophilic benzene ring, accelerated the cytotoxicity of AgNPs. Interestingly, none of the stabilizers tested, including biocompatible nonionic stabilizers (i.e., TW80 and cellulose) caused a reduction in AgNP toxicity. This showed that toxicity of AgNPs cannot be reduced using stabilizers.

• 디지털융복합연구
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• 제14권10호
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• pp.195-203
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• 2016

본 논문은 정보화전략계획 수립에서의 환경 분석 단계를 빠르게 수행하여, 결과물에 대한 품질을 향상시킬 수 있는 기반을 마련할 수 있는 방법을 제안한다. 기존의 환경 분석 방법은 외부 환경 분석, 내부 역량 분석, 정보화 방향 도출 활동으로 구성되어 있다. 환경 분석 첫 번째 단계에 현황파악, 주요 프로젝트 이해관계자와 인터뷰 준비, 인터뷰 수행을 통하여 초기 정보화 방향을 획득하기 위한 활동들을 추가하였다. 그리고 외부 환경 분석, 내부 역량 분석을 위한 핵심 질문 중심의 융복합 시나리오 기반 분석 모형을 적용하였다. 분석모형으로 외부 환경 분석, 내부 역량 분석 활동을 수행하여, 도출된 정보화 방향을 초기에 설정한 정보화 방향과 검증할 수 있도록 하였다. 연구 결과는 실제 프로젝트 현장에 적용하여, 빠르게 프로젝트를 수행할 수 있었고, 프로젝트 결과물에 대한 품질을 향상시킬 수 있었다.

• 한국멀티미디어학회논문지
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• 제24권7호
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• pp.890-902
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• 2021

Although the object detection accuracy with still images has been significantly improved with the advance of deep learning techniques, the object detection problem with video data remains as a challenging problem due to the real-time requirement and accuracy drop with occlusion. In this research, we propose a method in pig detection for video monitoring environment. First, we determine a motion, from a video data obtained from a tilted-down-view camera, based on the average size of each pig at each location with the training data, and extract key frames based on the motion information. For each key frame, we then apply YOLO, which is known to have a superior trade-off between accuracy and execution speed among many deep learning-based object detectors, in order to get pig's bounding boxes. Finally, we merge the bounding boxes between consecutive key frames in order to reduce false positive and negative cases. Based on the experiment results with a video data set obtained from a pig farm, we confirmed that the pigs could be detected with an accuracy of 97% at a processing speed of 37fps.

• 청정기술
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• 제22권1호
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• pp.62-72
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• 2016

요즈음은 국내외적으로 강화되고 있는 환경규제와 생산공정에서의 안전 강화 등으로 중소·중견기업들의 사전예방 시스템 구축이 매우 필요한 시기이다. 이에 반해 산업환경과 생산안전(ES)을 융합하는 전문가들의 네트워크는 물론 지식서비스 기업조차 지원을 할 수 있는 준비가 충분하지 않은 상태이다. 본 연구에서는 전문가의 설문조사를 통하여 산업환경과 생산 안전(ES)의 융합에 대한 현주소를 살펴보고, 이를 타개하기 위한 방법으로 ES 지식 클러스터 구축방안을 제안하였다. ES 융합 방법론의 개발과 보급, 효율성 분석과 라운드테이블 개최 등에 대한 세부 전략도 함께 제안하였다.