• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2010년도 추계학술대회
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• pp.605-608
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• 2010

Ad-hoc 네트워크가 정상적으로 동작하기 위해서는 각 노드가 동등한 권한을 갖고 상호 협조할 때 원활한 통신이 가능하다. 신뢰성을 확보하기 위해 인증된 노드로만 네트워크가 구성이 가능하지만 인증만으로 악의적 행위를 하는 노드를 완전히 배제할 수 없으므로 이들의 행위가 네트워크 전체를 위험에 빠뜨릴 수 있다. 이를 탐지 및 배제해야만 더욱 안전하고 신뢰할 수 있는 네트워크를 유지할 수 있으나 이에 대한 연구는 상대적으로 미흡한 수준이다. 따라서 신뢰 관계에 있는 노드로 구성된 네트워크에서 이기적이거나 악의적인 노드를 탐지하고 배제시켜 결과적으로 네트워크의 안전성과 신뢰성를 유지하고 처리율을 향상시킬 수 있는 방법을 제안한다.

• 한국정보통신학회논문지
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• 제14권12호
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• pp.2716-2723
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• 2010

Ad-hoc 네트워크가 정상적으로 동작하기 위해서는 각 노드가 동등한 권한을 갖고 상호 협조할 때 원활한 통신이 가능하다. 신뢰성을 확보하기 위해 인증된 노드로만 네트워크가 구성이 가능하지만 인증만으로 악의적 행위를 하는 노드를 완전히 배제할 수 없으므로 이들의 행위가 네트워크 전체를 위험에 빠뜨릴 수 있다. 이를 탐지 및 배제해야만 더욱 안전하고 신뢰할 수 있는 네트워크를 유지할 수 있으나 이에 대한 연구는 상대적으로 미흡한 수준이다. 따라서 신뢰 관계에 있는 노드로 구성된 네트워크에서 이기적이거나 악의적인 노드를 탐지하고 배제시켜 결과적으로 네트워크의 안전성과 신뢰성을 유지하고 처리율을 향상시킬 수 있는 방법을 제안한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권6호
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• pp.3280-3298
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• 2019

Vehicular ad-hoc networks (VANETs) have become increasingly significant in intelligent transportation systems, they play a great role in improving traffic safety and efficiency. In the deployment of intelligent VANETs, intelligent vehicles can efficiently exchange important or urgent traffic information and make driving decisions. Meanwhile, secure data communication and vehicle's identity privacy have been highlighted. To cope with these security issues, in this paper, we construct an efficient anonymous authentication scheme with secure communication in intelligent VANETs. Combing the ElGamal encryption technique with a modified Schnorr signature technique, the proposed scheme provides secure anonymous authentication process for encrypted message in the vehicle-to-infrastructure communication model, and achieves identity privacy, forward security, and reply attack resistance simultaneously. Moreover, except the trusted authority (TA), any outside entity cannot trace the real identity of an intelligent vehicle. The proposed scheme is designed on an identity-based system, which can remove the costs of establishing public key infrastructure (PKI) and certificates management. Compared with existing authentication schemes, the proposed scheme is much more practical in intelligent VANETs.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제8권7호
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• pp.2532-2553
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• 2014

In Asiacrypt 2003, Al-Riyami and Paterson proposed the notion of certificateless cryptography, a technique to remove key escrow from traditional identity-based cryptography as well as circumvent the certificate management problem of traditional public key cryptography. Subsequently much research has been done in the realm of certificateless encryption and signature schemes, but little to no work has been done for the identification primitive until 2013 when Chin et al. rigorously defined certificateless identification and proposed a concrete scheme. However Chin et al.'s scheme was proven in the random oracle model and Canetti et al. has shown that certain schemes provable secure in the random oracle model can be insecure when random oracles are replaced with actual hash functions. Therefore while having a proof in the random oracle model is better than having no proof at all, a scheme to be proven in the standard model would provide stronger security guarantees. In this paper, we propose the first certificateless identification scheme that is both efficient and show our proof of security in the standard model, that is without having to assume random oracles exist.

• 한국환경보건학회지
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• 제28권2호
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• pp.61-69
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• 2002

Oship stream is located nearby south eastern coasts. This study was performed to find out waters quality modeling and then to predict water quality of Oship stream. Based on survey data, BOD, T-N, T-P calibration and verification result were in good agreement with measured value within mean coefficient variance(MSE) value, which were 13.9%, 9.0%, 26.5% and 19.5%, 12.0%, 16.5%, respectively. Sectional water quality predictions of the main stream of Oship stream are executed on the basis of the following cases 1) with sewage treatment of Dogye-eup 2) reduction of mine wastewater treatment of 80% in th basin. As a result, BOD, T-P improvement rates at down stream of Oship stream, case 1) were appeared 12.2%, 22.2%, case 2) maximum sulfate ion and conductivity reduction removal rate of Oship stream were 58%, 68%. The main pollution sources of Oship-stream were almost domestic wastewater and mine wastewater discharged from Dogye-eup which located in uppers stream. The large effects will appear after the construction of Dogye sewage water treatment plant which remove the organic matter and nutrients in these sewage water. The waste water from mine can not easily to treat for characteristics of effluence and economic problems. However, to achieve the goal of water quality in Oship-stream water system, treatments of those are necessary.

• 한국치위생학회지
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• 제5권2호
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• pp.235-245
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• 2005

The changes in korean economic environment, from quantitative to qualitative growth of economy, go with making desperate efforts, that is, companies have put through many technical improvements, quality control, improvement of service, and so forth. Enterprises cut the number of employees through labor-management adjustment, so that a shortage of labor caused. An increase in intension of labor brought about growing the proportion of occupational diseases which is musculoskeletal diseases. Because of a rapid change in society and a change in our circumstances, we have many difficulties in examine a business disease closely. In support corroboration of relevance on admission of business, a criterion for dudging afford a basis for a causal relationship of medical science, take the state of working conditions into consideration, and at the same time, give a adaptable decision based on the purpose and point of "The Labor Standard Law" as well as "The Law about Industrial Accident Compensation insurance". In conclusion, it is necessary for the dental hygienists 10 reduce the on-duty hours a day, to make good postures in working, and to remove the stressful conditions in order to reduce the incidence of the lumbago. Good working postures, appropriate rest time, and early detection, care and education of the lumbago could be recommended for the dental hygienists.

• 한국기계가공학회지
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• 제17권4호
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• pp.137-142
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• 2018

Recycled synthetic resin materials produced from waste vinyl and waste plastic contain many foreign substances. Plastic products made from this recycled resin materials containing foreign substances are of poor quality, with reduced the strength and rigidity. Foreign substances include heavy metals, cement, foil, dyed paper and dust. In this study, the scratch-Dies process; which remove foreign sbustances, with precision and automation, through a three-stage mesh filter, is designed. The process is evaluated with finite element analysis according to vibration loading and make. After installing the manufactured equipment, recycled resin was producde, and its heavy metal content was evaluated. Recycled synthetic resin materials were also used plastic products and evaluate their strength. In addition, the change in production was assessed.

• 인터넷정보학회논문지
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• 제10권2호
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• pp.41-51
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• 2009

최근 다양한 분야에서 응용되고 있는 무선 센서 네트워크에서는 무선 통신으로 인한 보안 측면에서의 취약성을 극복하기 위한 연구가 진행 중이다. 무선 센서 네트워크에서의 안전한 통신을 보장하기 위해서는 기본적으로 센서 노드들의 키 관리, 센서 노드들의 상호 인증과 키 동의 프로토콜이 제공되어야 한다. 이러한 보안 서비스를 지원하기 위한 일부 프로토콜들이 제안되었지만 많은 메모리와 계산량 그리고 통신량이 요구되기도 하였다. 본 논문에서는 Juang이 제안한 센서 노드간 인증 및 키 공유 기법을 개선하여 보다 경량화되고 효율적인 프로토콜을 제시한다. 기존 방식에서는 센서간의 키 동의를 위한 센서 정보를 등록 센터까지 전송하였으나 제안 방식에서는 베이스 스테이션까지만 전송하도록 개선함으로써 공유키 설정에 필요한 통신량과 계산량을 개선하였다.

• 한국지리정보학회지
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• 제12권3호
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• pp.66-75
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• 2009

본 연구는 개념으로만 정립되었던 불가시심도분석을 프로그래밍 기법을 통하여 도구화 하였다. 분석 알고리즘은 기 개발된 가시권분석 알고리즘인 참조판 방식(reference plane method)을 기본으로 시점과 가까운 곳에는 점대점 방식(point-to-point method)을 복합적으로 사용하였으며, 정밀도를 높이기 위하여 지구곡률반경에 의한 오차와 빛의 굴절에 의한 오차를 반영하여 광역분석을 고려하였다. 이렇게 재구성된 알고리즘을 이용하여 배포 활용이 가능한 ArcToolbox 도구 형태로 개발하여 사용자 편의성과 대중성을 고려하였고, 개발된 분석도구를 활용하여 사례대상지에 적용한 결과 기존의 수작업으로 할 수 없었던 고해상도 광역분석이 가능하였다.

• 웰빙융합연구
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• 제6권1호
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• pp.17-22
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• 2023

Purpose: VOCs (volatile organic compounds) are all the organic compounds that react with solar rays and increase the concentration of ozone in the troposphere and are partially also known as carcinogens. The adsorption using activated carbon is usually applied to remove VOCs. Research design, data and methodology: The 20 places of surface coating facilities were selected to evaluate the emission amount of VOCs in Seoul. In addition, the removal efficiency of VOCs in 25 places of automobile coating facilities was evaluated. Results: The average emission amount of VOCs was 10.903 kg/hr from automobile coating facilities, while 3.520 kg/hr from other surface coating facilities. The removal efficiency in adsorption with the combustion catalytic process has the mean value of 87.9% and the regeneration efficiency of activated carbon has the mean value of 95.0%. Conclusions: The removal efficiency in adsorption with the biofiltration process has the mean value of 89.8% and the regeneration efficiency of activated carbon has the mean value of 94.8%. The removal efficiency in the plasma catalyst process has the mean value of 79.3%.