• Journal of Biosystems Engineering
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• 제28권1호
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• pp.53-58
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• 2003

This study was carried out to design, construct, and test a greenhouse monitoring system fur the environment and status of control devices in a greenhouse from a remote site using internet. The measuring items selected out of many environmental factors were temperature, humidity, solar radiation, CO$_2$, SOx, NOx concentration, EC, pH of nutrient solution, the state of control devices, and the image of greenhouse. The developed greenhouse monitoring system was composed of the network system and the measuring module. The network system consists of the three kinds of monitors named the Croup Monitor. the Client Monitor and the Server Monitor. The results of the study are summarized as follows. 1. The measuring module named the House Monitor. which is used to watch the state of the control device and the environment of the greenhouse, was developed to a embedded monitoring module using one chip microprocessor 2. For all measuring items. the House Monitor showed a satisfactory accuracy within the range of ${\pm}$0.3%FS. The House Monitors were connected to the Croup Monitor by communication method of RS-485 type and could operate under power and communication fault condition within 10 hours. The Croup Monitor was developed to receive and display measurement data received from the House Monitors and to control the greenhouse environmental devices. 3. The images of the plants inside greenhouse were captured by PC camera and sent to the Group Monitor. The greenhouse manager was able to monitor the growth state of plants inside greenhouse without visiting individual greenhouses. 4. Remote monitoring the greenhouse environment and status of control devices was implemented in a client/server environment. The client monitor of the greenhouse manager at a remote site or other greenhouse manager was able to monitor the greenhouse environment and the state of control devices from the Server Monitor using internet.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권2호
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• pp.709-730
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• 2017

To address the challenge of unprecedented growth in mobile data traffic, ultra-dense network deployment is a cost efficient solution to offload the traffic over some small cells. The overlapped coverage areas of small cells create more than one candidate access points for one mobile user. Signal strength based user association in IEEE 802.11 results in a significantly unbalanced load distribution among access points. However, the effective bandwidth demand of each user actually differs vastly due to their different preferences for mobile applications. In this paper, we formulate a set of non-linear integer programming models for joint user association control and user demand guarantee problem. In this model, we are trying to maximize the system capacity and guarantee the effective bandwidth demand for each user by soft-association control with a software defined network controller. With the fact of NP-hard complexity of non-linear integer programming solver, we propose a Kernighan Lin Algorithm based graph-partitioning method for a large-scale network. Finally, we evaluated the performance of the proposed algorithm for the edge users with heterogeneous bandwidth demands and mobility scenarios. Simulation results show that the proposed adaptive soft-association control can achieve a better performance than the other two and improves the individual quality of user experience with a little price on system throughput.

• 한국IT서비스학회지
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• 제16권3호
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• pp.167-183
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• 2017

The rapid growth of information technology and mobile service platforms, i.e., internet, google, and facebook, etc. has led the abundance of data. Due to this environment, the world is now facing a revolution in the process that data is searched, collected, stored, and shared. Abundance of data gives us several opportunities to knowledge discovery and data mining techniques. In recent years, data mining methods as a solution to discovery and extraction of available knowledge in database has been more popular in e-commerce service fields such as, in particular, movie recommendation. However, most of the classification approaches for predicting the movie popularity have used only several types of information of the movie such as actor, director, rating score, language and countries etc. In this study, we propose a classification-based support vector machine (SVM) model for predicting the movie popularity based on movie's genre data and social network data. Social network analysis (SNA) is used for improving the classification accuracy. This study builds the movies' network (one mode network) based on initial data which is a two mode network as user-to-movie network. For the proposed method we computed degree centrality, betweenness centrality, closeness centrality, and eigenvector centrality as centrality measures in movie's network. Those four centrality values and movies' genre data were used to classify the movie popularity in this study. The logistic regression, neural network, $na{\ddot{i}}ve$ Bayes classifier, and decision tree as benchmarking models for movie popularity classification were also used for comparison with the performance of our proposed model. To assess the classifier's performance accuracy this study used MovieLens data as an open database. Our empirical results indicate that our proposed model with movie's genre and centrality data has by approximately 0% higher accuracy than other classification models with only movie's genre data. The implications of our results show that our proposed model can be used for improving movie popularity classification accuracy.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2018년도 춘계학술대회 논문집
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• pp.74-74
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• 2018

Ti-6Al-4V alloys have been widely used as orthopedic materials because of their excellent corrosion resistance and mechanical properties. However, it does not bind directly to the bone, so it requires a surface modification. This problem can be solved by nanotube and micropore formation. Plasma electrolytic oxidation (PEO) treatment for micropore, which combines high-voltage spark and electrochemical oxidation, is a new way of forming a ceramic coating on light metals such as titanium and its alloys. This method has excellent reproducibility and can easily control the shape and size of the Ti alloy. In this study, formation of bioactive surface by PEO-treatment after $2^{nd}$ ATO technique of Ti-6Al-4V alloy was invesgated by various instrument. Nanotube oxide surface structure was formed on the surface by anodic oxidation treatment in 0.8 wt.% NaF and 1M $H_3PO_4$ electrolytes. After nanotube formation, nanotube layer was removed by ultrasonic cleaning. PEO-treatment was carried out at 280V for 3 minutes in the electrolytic solution containing the bioactive substance (Mg, Zn, Mn, Sr, and Si). The surface of Ti-6Al-4V alloy was observed by field emission scanning electron microscopy (FE-SEM, S-4800 Hitachi, Japan). An energy dispersive X-ray spectrometer (EDS, Inca program, Oxford, UK) was used to analyze the spectra of physiologically active Si, Mn, Mg, Zn, and Sr ions. The PEO film formed on the Ti-6Al-4V alloy surface was characterized using an X-ray diffractometer (TF-XRD, X'pert Philips, Netherlands). It is confirmed that bioactive ions play an essential role in the normal bone growth and metabolism of the human skeletal tissues.

• 융합보안논문지
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• 제7권2호
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• pp.101-106
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• 2007

최근 유비쿼터스 컴퓨팅 기술을 활용한 다양한 분야중 uHealthcare는 인간의 건강을 보다 효과적으로 관리할 수 있는 기술로서 각광을 받고 있다. 기존의 Healthcare 기술에서 환자와 의사를 원격으로 연결하여 진료행위를 하던 단순한 체계에서 센서 기술의 발전과 휴대기기의 발달로 환자가 진료행위를 인지하지 못하는 환경으로 급격하게 발전하고 있다. 하지만 uHealtcare에서의 인프라가 급성장함에 있어 생성되는 수많은 센서 상황정보를 처리 및 관리하기 위한 방안에 대한 연구가 미비한 상황이다. 상황인식 기술은 사용자로부터 상황정보를 획득하여 정보를 인식하고 관리하기 위한 방안이다. 하지만 인식한 상황정보를 어떻게 관리하고 효과적으로 제공할 것인지에 대한 연구가 부족한 상태이다. 개인화된 사용자로부터 발생하는 수많은 상황정보를 효율적으로 관리 및 보호하기 위한 연구가 요구된다. 기존 연구에서 상황정보를 정의 하고 인식하기 위한 연구를 중심으로 진행되었다면 인식된 수많은 상황정보를 안전하게 제공하기 위한 연구가 필요하다. 특히, 이러한 연구는 상황정보의 활용도가 매우 높은 의료환경을 중심으로 연구할 필요성이 있다. 따라서 본 논문에서는 환자로부터 의료 행위에 관련된 정보를 RFID를 사용하여 입원관련 정보, 입원실 위치, 환자의 이동 경로, 습도, 온도, 진료현황 등에 대한 상황정보를 전달받아 저장 및 관리 방법으로 태그 매칭을 도입하여 정보를 관리하기 위한 방안을 제시한다.

• 한국게임학회 논문지
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• 제15권4호
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• pp.79-92
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• 2015

국내 MMORPG 온라인게임 시장의 동향을 보면 이용자들의 트렌드 변화와 모바일게임 및 해외 게임의 강세로 성장이 정체되어 있는 실정이다. 이렇게 국내 게임이 성장하지 못하는 근본 원인은 변화 없이 기존 게임 형태 그대로 양산되어 출시되는 현 시장의 잘못된 모순과 각종 플레이로 인해 생기는 문제점들이 서비스 실패의 주원인이다. 이에 본 논문에서는 게임 디자인의 변화를 주기 위한 방법으로 시나리오의 중요성 및 필요성을 입증하고 기존 게임이 가지고 있는 문제들을 이용자들의 의견수렴과 성공한 국내 및 해외 게임들을 비교 분석하여 새로운 타입의 TIME FLOW 시나리오를 제안하고자 한다. 이 기법은 게임 내 시간이 흘러 환경과 스토리가 자연적으로 변화되면서 그에 따른 수많은 콘텐츠를 이용자들에게 제공하게 되는 시스템 설계 구축을 목표로 한다. 이를 통해 새로운 형태의 게임 제작 환경 틀을 설계하고 교육적인 인재 양성 효과를 기대한다.

• 정보보호학회논문지
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• 제25권3호
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• pp.493-500
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• 2015

정부 3.0 공공정보 공유 및 개방, 소셜네트워크서비스의 활성화 그리고 사용자 간의 공유 데이터 증가로 인터넷상에 노출되는 사용자의 개인 정보가 증가하고 있다. 이에 따라 프라이버시를 지키기 위한 익명화 알고리즘이 등장하였으며 관계형 데이터베이스에서의 익명화 알고리즘은 k-익명성(k-anonymity)을 시작으로 ${\ell}$-다양성(${\ell}$-diversity), t-밀집성(t-closeness)으로 발전하였다. 익명화 알고리즘의 성능 향상 부분은 계속해서 효율적인 방법이 제안되고 있지만, 기업이나 공공기관에서는 알고리즘 성능의 향상보다는 전체적인 익명화 처리 방법이 필요한 실정이다. 본 논문에서는 관계형 데이터베이스에서 데이터의 그룹화를 이용하여 k-익명성, ${\ell}$-다양성, t-밀집성 알고리즘을 처리하는 과정을 구체화하였다.

• Journal of Acupuncture Research
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• 제19권1호
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• pp.189-202
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• 2002

Objective : This study is designed to investigate the effects of bee venom and melittin on cell death in neuroblastoma cell line after pretreatment with NG(nerve growth inhibitory substance) Methods : It was evaluated by using MTT assay, morphological method, DNA fragmenation, flow cytometry, immunocytochemistry analysis, RT-PCR and Western blot. Results : The MTT assay demonstrated that neuroblastoma cell viability was significantly inhibited dose-dependently by treatment with bee venom and melittin after pretreatment with NG in comparison awith control. The morphological study and fow cytometry demonstrated that neuroblastoma cell showed apoptosis. DNA fragmenation showed DNA ladder below 1 Kbp. Immunocytochemistry assay demonstrated that Fos and MAPK were down-regulated. RT-PCR analysis demonstrated that Fos and MAPK was down-regulated. Western blot demonstrated that Fos and MAPK were down-regulated from $1{\mu}g/ml$ bee venom in neuroblastoma cell pretreated with NG. Conclusion : These result suggests that bee venom and melittin after NG treatment have significant anti-cancer effect and further study is needed in vivo.

• 보존과학회지
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• 제6권2호
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• pp.141-148
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• 1997

각종 국토개발사업이 본격적으로 시작된 1970년대 이후 그에 따른 발굴조사도 매년 증가되고 있다. 다양한 재질로 이루어진 유물은 출토후 보관환경에 따라 돌이킬 수 없는 손상을 받을 수 있다. 출토 유물의 보존에 대한 중요성은 증가되고 있으나, 발굴을 담당하는 기관과 비교하여, 출토된 유물을 보존처리하는 기관은 소수에 불과한 실정이다. 일반적으로 출토된 금속유물은 불안정하여 쉽게 손상되어진다. 특히 주조철제는 발굴후 건조되지 않도록 해야 한다. 이는 출토된 주조철제가 흙, 부식층과 금속심으로 이루어진 층 사이에서 건조로 인해 유물이 순간적으로 붕괴되어지기 때문이다. 출토된 금속유물의 안전한 보존방법은 다음과 같이 요약할 수 있다. (1)먼저 발굴현장에서 금속유물은 환경변화에 따른 손상을 방지하기 위해 유물포장용 특수비닐로 밀봉처리 하거나 알칼리 용액속에 침적시키는 것이다. (2)현장에서 임시 보존처리후 유물은 보존처리실에서 안전한 방법에 의한 처리를 해야 한다. (3)처리된 유물은 일정한 온${\cdot}$습도 유지, 주기적인 상태조사, 자외선 차단 등 안정한 보관환경을 유지시켜야만 재부식을 방지할 수 있다.

• 한국환경농학회지
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• 제30권4호
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• pp.453-458
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• 2011

BACKGROUND: Coleosporium plectranthi, an obligate parasite, which is responsible for the rust disease of Perilla frutescens, a plant in Korea, commonly known as Perilla. All rusts are obligate parasites, meaning that they require a living host to complete their life cycle. They generally do not kill the host plant but can severely reduce growth and yield. Food and feed spoilage fungi cause great economic losses worldwide. It is estimated that between 5 and 10% of the world food production is wasted due to fungal deterioration. Rust disease of Perilla is highly frequent and is widely spread in Korea. The present study was designed to investigate a novel media for the urediniospore germination in vitro and anti-rust activity as well as GC-MS analysis of oak pyroligneous liquor. METHOD AND RESULTS: Urediniospores were collected from the infected leaf of Perilla. Spore suspension was made and the suspension was inoculated in the 2% water agar media with proper humidity, then they were incubated at $26^{\circ}C$ for 56 hrs. The GC-MS analysis of the oak pyroligneous liquor was also done to check the chemical composition. GC-MS analysis of the wood vinegar was found 15 compounds, among them o-mthoxyphenol (25.93%), 2,6-dimethoxyphenol (16.06%), 4-methylenecyclohexanone (10.69%), 2,3-dihydroxytoluene (7.84%), levoglucosane (6.14%) and propanoic acid (5.32%) were the major components. Different concentration of the oak pyroligneous liquor was used, and spore inhibition was recorded on the basis of spore counting. The best results were noted at the concentration of 50% solution where 31.8% spores were inhibited. CONCLUSION: On the basis of the chemical composition of the oak pyroligneous liquor and the activity recorded we can use it as an anti-rust agent.