• Proceedings of the Korea Information Processing Society Conference
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• 2003.11c
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• pp.1973-1976
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• 2003

기존의 WAP 게이트웨이 모델에서의 게이트웨이는 많은 기능을 수행하였다. 이에 따른 게이트웨이 오버헤드가 증가하는 문제를 지니고 있기 때문에 이러한 문제를 해결하기 위해 상대적으로 수행 기능이 적고 각 content 제공자에 따라 나누어있는 Web 서버에 게이트웨이의 일부 기능을 이식하여 설계한 e-WAP 모델을 제시하였다. 하지만 e-WAP 의 보안 모델은 이전 WAP 게이트웨이 모델에서 사용되는 보안 방식을 사용하였기 때문에 종단간 보안 (end-to-end Securir)을 보장하지 못하는 기존 WAP의 보안 문제를 그대로 가지고 있다. 이에 본 논문은 기존의 SSL 과 WTLS 를 이용한 암호화 통신 프로토콜을 이용한 보안 모델에 서버와 무선 단말기 사이에 전송되는 데이터에 대해 암호화 한번 더 수행하여 종단간 보안을 보장하는 새로운 e-WAP 보안 모델을 제안하고자 한다.

• Water for future
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• v.52 no.1
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• pp.40-51
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• 2019

본 연구를 통해 재난안전데이터의 공동활용을 위해 다양한 관점에서의 데이터 표준화가 필요하다는 것을 확인하였다. 향후 4차 산업혁명에서의 데이터의 위치와 빅데이터에서의 데이터 융합, 공공데이터 이용에 대한 패러다임의 변화에서도 볼 수 있듯이 재난안전정보 뿐만 아니라 데이터는 수요자 중심의 활용과 이용으로 새로운 데이터의 가치를 얻을 수 있음을 알 수 있다. 이러한 재난안전정보의 효율적이고 체계적인 공동활용을 위해 재난안전정보 관점에서 비정형 자료의 데이터 수집, 데이터베이스의 관리 및 데이터의 표준(안), 재난안전정보의 교환 표준(안) 및 공동활용 전략을 제시하였다. 이러한 연구를 통해 재난안전정보의 공동활용 체계를 구축하여 정보공유 및 재난안전정보의 추적, 활용이 가능하게 하여 신속하게 대국민 재난정보를 제공할 수 있는 체계를 구축하여 경험기반의 재난관리 및 지능형 재난관리의 의사결정을 지원할 수 있는 시스템으로 확장할 수 있을 것으로 기대한다.

• The Journal of Korea Robotics Society
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• v.17 no.4
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• pp.477-483
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• 2022

In this paper, we propose waste collection vehicle system with a safety device for worker safety and an autonomous driving function. The steering system is applied as MDPS (Motor Drive Power Steering) system to control the waste collection vehicle of the internal combustion engine. Safety-related errors is prevented through redundancy brake of the integrated system and the control braking system. In order to ensure safety between workers and waste collection vehicles, work guidelines and safety devices for emergency stop in case of danger are applied to vehicles. In addition, this research is conducted on improving the working efficiency through vehicle condition monitoring system and a short-range control system for field test. This research is aimed to secure stability through demonstration and contribute to the industrialization of unmanned waste collection vehicles.

• Review of KIISC
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• v.10 no.3
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• pp.49-62
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• 2000

인터넷을 통한 기업간(B2B) 전자거래 시장규모가 올해 17조원대에 이르고 기업과 소비자간(B2C) 전자상거래 시장규모 또한 1조원을 넘어서는 등 전체 국내 전자상거래 시장 규모가 18조원을 넘어 설 전망이다. 이는 정보통신시스템에 대한 사회 전반의 의존도가 한층 증대하고 있음을 보여주는 단적인 예라 할 수 있다 오늘날 인터넷 사용이 보편화되고 전자상거래의 규모가 커져 갈수록 정보보호시스템에 대한 신뢰성 및 안전성에 대한 입증 노력 또한 더 강하게 요구되고 있는게 사실이다. 특히 안전성이 입증되진 않은 취약한 정보보호시스템을 사용한 시스템 구축은 오히려 그 위험성을 증가시킬 수 있음을 최근의 많은 해킹사례를 통해 경험한바 있다, 향후 예견되는 이러한 엄청난 사회적 손실을 막기 위한 제도적 노력의 일환으로 미국, 영국, 독일, 프랑스 등 선진국에서는 10여년 전부터 자국의 환경에 적합한 평가기준을 마련하여 정보보호시스템을 평가해오고 있다 본고에서는 정보보호시스템 평가제도와 관련하여 최근의 국제동향과 그에 따른 국내 대응방안을 모색해 보고자한다. 특히 정보보호시스템 평가를 위한 국제기준의 CC(Common Criteria)와 이를 기반으로 맺어진 MRA(Mutual Recognition Arrangement)의 전개과정을 살펴보고 유럽의 상호인정협정인 ITSEC-MRA의 출범배경과 올 5월에 새롭게 출범한 CC-RA체제와 특징적인 모습을 고찰해 보고자한다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.38 no.6
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• pp.809-818
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• 2018

In this paper, in order to evaluate the impact of future climate change in North Korea, we collected the climate data of each station in North Korea provided by WMO and expanded the lack of time series data. Using the RCP climate change scenario, And the impact of climate change on disasters using local vulnerability to disasters in the event of a disaster. In order to evaluate this, the 11 cities in North Korea were evaluated for Design Rainfall Load, human risk index (HRI), and disaster impact index (DII) at each stage. As a result, Jaffe increased from C grade to B grade in the Future 1 period. At Future 2, North Hwanghae proved to be dangerous as it was, and Gangwon-do and Hwanghae-do provincial grade rose to C grade. In the case of Future 3, Pyongyang City dropped from C grade to D grade, Hamgyong and Gyeongsang City descend from B grade to C grade, Gangwon-do and Jagangdo descend from C grade to D grade and Pyongyang city descend from C grade to D grade. Respectively.

• Journal of Digital Convergence
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• v.16 no.12
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• pp.109-122
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• 2018

This study investigates factors to disturb the e-Learning persistence of adult learners based on a case study of Cyber University students located in Seoul Korea. Main findings of our research show that economic burden, shortage of studying hours, digital literacy problem, perceived isolation, inefficient interaction between lecturer and student, and support of family are primary factors to influence the persistence of online education in a Cyber university. From our case study, we recommend to improve the scholarship system, and supplement the offline special lectures at weekends in order to alleviate perceived isolation. A novelty of this paper is that economic burden is highlighted to influence the persistence of adult learners.

• Korean small business review
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• v.42 no.2
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• pp.139-177
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• 2020

The concepts of entrepreneurship are very various. So many researchers are confused or not sure of the concepts of entrepreneurship. Likewise, the concept of entrepreneur are very various, and confused of the concepts of entrepreneur. This study try to set a comprehensive conceptual model of concepts of entrepreneurs. This model suggest a prototype model of entrepreneur with historical context and anthropological approach.

• Korean Journal Plant Pathology
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• v.13 no.3
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• pp.139-144
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• 1997

A destructive collar rot of apple caused by a species of Phytophthora has widely occurred in Kyungbuk and less extended in Chungbuk, Chungnam and Chunbuk provinces of Korea. Significantly higher incidence of the disease was observed on cv. Fuji when M26 or M9 was used as dwarfing stocks. Incidence of the disease at several orchards in Uisung, Kunwi, Yesan and Muju ranged from 45 to 80%. Twenty-five isolates of the causal fungus were collected and all isolates were identified as P. cactorum on the basis of their cultural and morphological characters. The fungus produced markedly papillate and broadly ovoid deciduous sporangia both on agar and in water, and a short pedicel was attached to each sporangium. Oospores were readily formed on clarified V8 agar by single isolates and all the antheridia were paragynous. The fungus neither grew nor produced oospores under 5 and over 33$^{\circ}C$. The destructive collar rot of apple caused by P. cactorum has not been reported in Korea previously.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.8
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• pp.3758-3765
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• 2011

The operators' visibility of underwater construction equipments plays a key role for safe and efficient construction. The visibility can be limited within 30cm in the West Sea of South Korea where water is considerably turbid. This paper investigates the appropriate location and projection angle of light to be used for construction equipments using model tests. It was discovered that visibility was obtained when the light was located near the target objects with a projection angle of $45^{\circ}$.

• Journal of Korean Society for Geospatial Information Science
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• v.16 no.1
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• pp.67-73
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• 2008

The most common method of pipeline inspection is to use a remote-controlled-machine equipped with a CCTV, which, however, has many limitations to accurately inspect pipeline condition. In case of a typical CCTV, since the camera looks at the end point of the pipe, the locations of the defects and distance-readings are often different. In addition, the quality and accuracy of the inspection is highly dependent on the operator's skill and experience. In this research a new system is developed by use of the image processing techniques and the lens combination. The image acquisition system is developed that acquires the front and the side view of the pipe simultaneously. Side view unwrapping and stitching technology using image process techniques are developed which delivers high resolution image data.