고용보험 피보험자 고용변동 현황

지승현 한국고용정보원 2011 고용이슈 Vol.- No.-

지속가능발전에 반영된 사회경제적 인간상에 대한 이론적 고찰 : 행동경제학을 중심으로

지승현,남영숙 한국환경교육학회 2009 한국환경교육학회 학술대회 자료집 Vol.- No.1

Properties of Hetero-Structured Diode with n-Type ZnO and p-Type NiO

지승현,박훈,김수호,Joo Won Lee,Young Soo Yoon,강지원 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.1

Using a DC and RF magnetron sputtering system, we fabricated an ultraviolet (UV) reactive hetero-structured diode with n-type ZnO, p-type NiO and a Ni electrode with an indistinct interface between the NiO layer and the Ni electrode. To decrease the contact resistance and the number of process steps, we fabricated the hetero-structured diode via a one-step process, which could deposit the ZnO, NiO and Ni electrode sequentially in one chamber without heat treatment or vacuum break. We compared the I-V characteristics of the hetero-structured diodes with various metal electrodes (Al, Ni and Ni with an indistinct interface) to investigate the decrease in the contact resistance between the NiO layer and the Ni electrode. In the I-V measurements, the heterostructured diode with the indistinct interface between the NiO layer and the Ni electrode exhibited distinct rectifying current-voltage (I-V) characteristics. The threshold voltage decreased 0.57 V with the hetero-structured diode fabricated by using a sputtering system. The current increased 0.9 mA at a forward voltage of 2.5 eV. The indistinct interface between the NiO and the Ni was analyzed using scanning electron microscopy. UV light with a wavelength of 325 nm reacted on a hetero-structured diode. Based on these results, we demonstrated that the hetero-structured diode with an indistinct interface between the NiO layer and the Ni electrode is a good UV photodetector.

지속가능발전교육에서의 리터러시 의미 고찰

지승현,남영숙 한국환경교육학회 2011 한국환경교육학회 학술대회 자료집 Vol.2011 No.7

21세기 지식기반사회에서의 지속가능발전교육 방향 탐색

지승현,남영숙 한국환경교육학회 2007 環境 敎育 Vol.20 No.1

In spite of the perceived importance of sustainable development in society, we still fails to reflect consistently our best understandings about the sustainable development and education for sustainable development. The purpose of this study is to inquire into the orientation of education for sustainable development in the 21st Century knowledge-based society. The results of this study can be summarized as follows. First, it is necessary to provide newly defined sustainable development which enables us to transform unsustainable way of life into environmentally sound and sustainable development. Education for sustainable development is defined as a basic education that have a mature understanding among the human, nature and wisdom of life Second, we should emphasis on a system thinking, basic communication in order to encourage education for sustainable development as a learning strategy. Third we should suggest both individual and community learning education for sustainable development. Finally, we develope knowledge system of sustainable development in accordance with the theories of knowledge management.In conclusion, it is necessary to approach education for sustainable development in the context of the knowledge-based society and the information age. It enables us enhance a new awareness and attitudes towards sustainable development. Furthermore, it is expected to deve-

IoT기반 실외 도로건설 위험방지시스템에서의 보안취약점 분석과 대응

지승현 한국컴퓨터정보학회 2020 韓國컴퓨터情報學會論文誌 Vol.25 No.7

사물인터넷(Internet of Things: IoT) 기술 발전에 따라서, IoT기술의 적용범위는 실내 환경의 생활 편의성 개선에서 벗어나 실외 환경에서의 발생가능한 위험을 사전에 감지·예방하는 산업안전분야로 확대되고 있다. 이러한 IoT서비스 확대는 많은 장점을 제공함에도 데이터 유출과 변조 등의 보안 문제도 함께 발생시키므로 이에 따른 보안 대응전략 연구도 활발히 진행되고 있다. 본논문에서는 실외환경에서의 IoT기반 도로건설 위험방지시스템을 연구대상으로 IoT 보안관리 가이드라인을 제안한다. 연구대상에 적용한 저전력-광역(LPWA, BLE) 통신프로토콜의 보안취약점을조사한 결과, 정보보안의 3대 요소인 기밀성, 무결성, 가용성 측면에서 보안취약점을 확인하여 이를 최소화할 수 있도록 취약점 별 대응방안을 제안하였다. 본 연구는 기 구현된 실외환경에서의IoT기반 도로건설 위험방지시스템 운영에서 발생할 수 있는 취약점 조사·분석과 취약점별 실질적인 보안지침을 제안하는데 연구의 의의가 있다. Following the development of Internet of Things (IoT) technology, the scope of application of IoT technology is expanding to industrial safety areas that detect and prevent possible risks in outdoor environments in advance, away from improving the convenience of living in indoor environments. Although this expansion of IoT service provides many advantages, it also causes security problems such as data leakage and modulation, so research on security response strategies is being actively carried out. In this paper, the IoT-based road construction risk management system in outdoor environment is proposed as a research subject. As a result of investigating the security vulnerabilities of the low-power wide-area (LPWA, BLE) communication protocol applied to the research targets, the security vulnerabilities were identified in terms of confidentiality, integrity, and availability, which are the three major elements of information security, and countermeasures for each vulnerability were proposed. This study is meaningful in investigating and analyzing possible vulnerabilities in the operation of the IoT-based risk management system and proposing practical security guidelines for each vulnerability

N_2O 반응 가스를 주입한 RF Reactive Magnetron Sputtering에 의한 ZrO_2 박막의 구조 및 부식특성 연구

지승현,이석희,백종혁,김준환,윤영수 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.1

A ZrO_2 thin film as a corrosion protective layer was deposited on Zircaloy-4 (Z-4) clad material using N_2O as a reactive gas by RF reactive magnetron sputtering at room temperature. The Z-4 substrate was located in plasma or out of plasma during the ZrO_2 deposition process to investigate mechanical and corrosive properties for the plasma immersion. Tetragonal and monoclinic phases were existed in ZrO_2 thin film immersed in plasma. We observed that a grain size of the ZrO_2 thin film immersed in plasma state is larger than that of the ZrO_2 thin film out of plasma state. In addition, the corrosive property of the ZrO_2 thin films in the plasma was characterized using the weight gains of Z-4 after the corrosion test. Compared with the ZrO_2 thin film immersed out of plasma, the weight gains of ZrO_2 thin film immersed in plasma were larger. These results indicate that the ZrO_2 film with the tetragonal phase in the ZrO_2 can protect the Z-4 from corrosive phenomena.

지속가능발전 이해 교육 프로그램 개발 연구

지승현,남영숙 한국환경교육학회 2007 環境 敎育 Vol.20 No.3

The purpose of this study is to develope education for sustainable development of understanding programme. The results of this study are as follows.Firstly, this programme is intended to enhance an university student's basic understanding, core skills and viewpoint of sustainable development. Secondly, the programme contains 10 modules, organised in four thematic sections. Each module is made up of two or three activities that are supposed to encourage adult learners in their mature understanding of sustainable development.Thirdly, there are three key teaching-learning strategies such as a case study, story telling and project study. These teaching-learning methods play a key role in the learning process.In conclusion, it is expected to indicate the goal and the value of the sustainable development clearly, and to provide the related information and knowledge constantly and systematically in the learning for sustainable development. Thus, it would be possible to enhance learner's awareness and attitudes towards sustainable development.

SVLIW 프로세서와 VLIW 프로세서의 명령어 캐싱에 따른 성능 분석

지승현,박노광,김석일,Ji, Sung-Hyun,Park, No-Kwang,Kim, Suk-Il 한국전기전자학회 1997 전기전자학회논문지 Vol.1 No.1

실시간에 VLIW 명령어를 스케줄링하는 SVLIW 프로세서 구조는 실행 중 LNOP(긴 NOP 명령어)를 삽입하여 자원 충돌이나 자료 종속 문제를 스스로 해결할 수 있다. 따라서 SVLIW 프로세서에서는 메모리나 캐시에 적재되는 목적 코드로부터 LNOP 명령어를 제거할 수 있다. 그러므로 SVLIW 프로세서에서는 같은 크기의 캐시를 가진 VLIW 프로세서에 비하여 프로그램의 실행 도중에 발생하는 캐시 미스의 발생 빈도가 적어진다. 캐시 미스가 적게 발생하면 결국 평균 메모리 참조 시간이 짧아지므로 프로그램을 수행하는데 걸리는 실행 사이클의 수가 적어지게 된다. 이러한 특징은 한편 명령어 파이프라인 단계를 늘림으로 인한 영향을 상쇄할 수 있기 때문에 전체적으로 성능을 향상시킬 수 있다. 본 논문에서는 두 가지 프로세서 구조에서 어떤 응용 프로그램을 수행할 때 소요되는 실행 사이클을 예측하는 모델을 확립하고 이를 비교하였다. 또한, 시뮬레이션 결과로부터 캐시 미스가 발생하였을 때 메모리를 참조하는데 걸리는 시간이 길어질수록 SVLIW 프로세서에서의 실행 사이클이 VLIW 프로세서의 경우에 비하여 짧아지는 것을 확인할 수 있었다. SVLIW processor architectures can resolve resource collisions and data dependencies between the instructions while scheduling VLIW instructions at run-time. As a result, long NOP word instructions can be removed from the object code produced for the processor. Thus, the occurrence of cache misses on the SVLIW processor would be lesser than that on the same cache size VLIW processor. Less frequent cache misses on the SVLIW processor would incur less frequent memory access, and thus, the total execution cycles to complete an application would be shortened compared with cases on the VLIW processor. Such a feature eventually compromises effects of longer instruction pipeline stages than those of the VLIW processor. In this paper, we formulate and compare two execution cycle models of the two architectures. A simulation results show that the longer memory access cycles when cache miss occurs, the total execution cycles of SVLIW processor would be shorter than those of VLIW processor.

OLED의 잉크젯 공정을 위한 SAM형 습식 표면 개질

지승현,윤영수,Ji, Seung-Hyeon,Yun, Yeong-Su 한국전기전자재료학회 2008 전기전자재료 Vol.21 No.2