고용보험 피보험자 고용변동 현황

지승현 한국고용정보원 2012 고용이슈 Vol.- No.-

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

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.

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

적극적인 명령어 압축을 통한 성능향상

지승현,김석일,Ji, Seung-Hyeon,Kim, Seok-Il 한국정보처리학회 2002 정보처리학회논문지 A Vol.9 No.2

본 논문에서는 독립적으로 스케쥴링할 수 있는 VLIW 명령어들을 소개함으로써, 컴파일러와 프로세서에서의 스케줄링 작업을 더욱 균등하게 분배할 수 있는 프로세서 구조를 제안하였다. 제안한 APVLIW(Aggressively Packed VLIW) 프로세서의 목표는 자료종속성을 포함한 VLIW 명령어들을 독립적으로 스케줄링이다. APVLIW 프로세서는 기존의 VLIW 코드로부터 대부분의 NOP(No Operations)과 LNOP(Long NOPs) 명령어들을 제거함으로써 압축된 형태의 긴명령어 그룹을 생성한다. 본 논문에서 제안된 APVLIW 프로세서는 여러 개의 연산처리기와 동적 스케줄러의 쌍들과 자료종속성 정보를 사용하여 긴명령어내의 각 명령어를 독립적으로 스케줄링할 수 있다. 이러한 스케줄링 기법은 특히 루프를 포함한 프로그램을 실행할 때 효과적이다. 실험 결과를 통해서 캐시크기의 변화와 벤치마크 프로그램에 상관없이 APVLIW 프로세서가 VLIM 프로세서에 비하여 성능이 향상됨을 확인하였다. This paper proposes balancing scheduling effort more evenly between the compiler and the processor, by introducing independently scheduled VLIW instructions. Aggressively Packed VLIW (APVLIW) processor is aimed specifically at independent scheduling Very Long Instruction Word(VLIW) instructions with dependency information. The APVLIW processor independently schedules earth instruction within long instructions using functional unit and dynamic scheduler pairs. Every dynamic scheduler dynamically checks far data dependencies and resource collisions while scheduling each instruction. This scheduling is especially effective in applications containing loops. We simulate the architecture and show that the APVLIW processor performs significantly better than the VLIW processor for a wide range of cache sizes and across various numerical benchmark applications.

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.

적극적인 명령어 압축을 통한 성능향상

지승현,김석일 한국정보처리학회 2002 정보처리학회논문지. 컴퓨터 및 통신시스템 Vol.9 No.2

고용안정성 관점에서 본 우수중소기업 선정 모형

지승현,조인호 한국고용정보원 2012 고용이슈 Vol.- No.-

OLED의 잉크젯 공정을 위한 SAM형 습식 표면 개질

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