• 농촌지도와개발
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• 제18권1호
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• pp.153-197
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• 2011

The purpose of this study is to look at the development and status of Danish Agricultural Advisory Service (DAAS) and to find some implications on Korean agricultural and rural extension. Agriculture is main industry contributed to economic growth in Denmark. Main factors of this success would be strong farmers' organizations, commercial co-operatives, farmers' active participation in training and education, and independent advisory service owned and managed by farmers. DAAS has unique developmental history. First service was started by local farmer's organization in 1871. Farmers themselves wanted to start advisory service in order to improve the quality of butter. National center of DAAS was established in 1971 in order to disseminate knowledge to local centers, to develop new activities and computer programs, and to deliver in-service training of local advisors. In 2010, one national center with 550 employees and 32 local centers with 2,900 employes are serving for 48,000 farms. The service covers almost all farmers' needs such as production, finance, tax, buildings, crops, livestock, organic production, environment, legal matter. DAAS Academy tries to offer relevant, just-in-time training activities in order to develop the competences of advisors effectively.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권7호
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• pp.3375-3400
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• 2018

With the advent of database-as-a-service (DAAS) and cloud computing, more and more data owners are motivated to outsource their data to cloud database in consideration of convenience and cost. However, it has become a challenging work to provide security to database as service model in cloud computing, because adversaries may try to gain access to sensitive data, and curious or malicious administrators may capture and leak data. In order to realize privacy preservation, sensitive data should be encrypted before outsourcing. In this paper, we present a secure and practical system over encrypted cloud data, called QSDB (queryable and secure database), which simultaneously supports SQL query operations. The proposed system can store and process the floating point numbers without compromising the security of data. To balance tradeoff between data privacy protection and query processing efficiency, QSDB utilizes three different encryption models to encrypt data. Our strategy is to process as much queries as possible at the cloud server. Encryption of queries and decryption of encrypted queries results are performed at client. Experiments on the real-world data sets were conducted to demonstrate the efficiency and practicality of the proposed system.

• Gut and Liver
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• 제12권6호
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• pp.694-703
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• 2018

Background/Aims: Limited data exist comparing the safety and efficacy of direct-acting antivirals (DAAs) in hepatitis C virus (HCV) monoinfected and HCV/human immunodeficiency virus (HIV) coinfected patients in the real-world clinic practice setting. Methods: All HCV monoinfected and HCV/HIV coinfected patients treated with DAAs between January 2014 and October 2017 in community clinic settings were retrospectively analyzed. Pretreatment baseline patient characteristics, treatment efficacy, factors affecting sustained virologic response at 12 weeks (SVR12) after treatment, and adverse reactions were compared between the groups. Results: A total of 327 patients were included in the study, of which 253 were HCV monoinfected, and 74 were HCV/HIV coinfected. There was a statistically significant difference observed in SVR12 when comparing HCV monoinfection and HCV/HIV coinfection (94% and 84%, respectively, p=0.005). However, there were no significant factors identified as a predictor of a reduced response. The most common adverse effect was fatigue (27%). No significant drug interaction was observed between DAA and antiretroviral therapy. None of the patients discontinued the treatment due to adverse events. Conclusions: In a real-world setting, DAA regimens have lower SVR12 in HCV/HIV coinfection than in HCV monoinfection. Further studies involving a higher number of HCV/HIV coinfected patients are needed to identify real predictors of a reduced response.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 춘계학술대회논문집
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• pp.1191-1195
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• 2007

Many approximate models for interaction between a flexible structure and an infinite external acoustic medium have been developed for a long time. Among them, Doubly Asymptotic Approximations (DAAs) are very well known approximations. But, it has shortcomings in intermediate frequency range and can't fully describe the acoustic medium. So, this paper presents the modified approximation by applying the retarded and advanced potentials to Kirchhoff's formula. It describes the external acoustic medium more in detail and shows a good result in early time transient responses when it was applied to a spherical shell. Through a spherical shell interacting with external acoustic medium, the transient responses for the proposed model is compared to Huang's exact solution and DAA2.

• 융합보안논문지
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• 제21권3호
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• pp.25-30
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• 2021

현재 코로나-19 팬데믹 현상으로 인해 기업이나 기관에서는 원격근무를 제공하는 상황에서 안전한 근무환경을 구축하기 위해 논리적 망 분리 기술 중 하나인 가상화 데스크톱 기술을 도입하고 있다. 가상화 데스크톱 기술을 도입함에 따라 기업이나 기관에서는 망분리 환경을 보다 안전하고 효과적으로 운영할 수 있게 되었으며, 업무망에 신속하고 안전하게 접근해 업무 효율성과 생산성을 높일 수 있게 되었다. 그러나 가상화 데스크톱 기술을 도입함에 있어, 높은 사양의 서버와 스토리지, 라이선스의 비용적인 문제가 있으며, 운용 및 관리적인 측면에서의 보완이 필요한 실정이다. 이에 대응하기 위한 방안으로 기업이나 기관에서는 클라우드 컴퓨팅 기반의 기술인 가상 데스크톱 서비스(DaaS, Desktop as a Service)로 전환하는 추세이다. 하지만 클라우드 컴퓨팅 기반의 기술인 가상 데스크톱 서비스에서 공동책임모델은 사용자 접근 통제와 데이터 보안은 사용자에게 책임이 있다. 이에 본 논문에서는 가상 데스크톱 서비스 환경에서 공동책임 모델을 근거로, 사용자 접근 통제와 데이터 보안에 대한 개선 방안으로 클라우드 기반 하드웨어 보안 모듈(CloudHSM)과 edge-DRM Proxy를 제안한다.