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Technology Trends Analysis of Airbone Network
KiHwan Kim,HyunHo Kim,SangGon Lee,HoonJae Lee,YoungJae Ryu 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.10
Development with IT technology has wide effect for military sector. For this reasons, the important sources is ‘First see, and first determine, and first attack’ in modern and future warfare. And there are also importance with patriot robot such as drone for understand the movement pattern with enemy. Therefore, in develop country; they process with sensor system, delicate attack system, informationization and identification proactively. For now, the connection between equipment is essential in the war environment, so the secure with these things is important. But this is planned with using network structure based on TCP/IP, So there is a raised problem that plan which I mentioned has difficult to deal with attack from using structural weakness. In this paper, the attack type which is possible in the Airborne Network is made an inquiry and it analyze.
Screening of Leaves of Higher Plants for Antibacterial Action
Kihwan Bae,Jaehwa Byun 한국생약학회 1987 생약학회지 Vol.18 No.1
The methanol and benzene extracts of the leaves of 55 higher plants in Korea were tested for their antibacterial activity against three Gram positive bacteria, Streptococcus mutans, Staphylococcus aureus and Bacillus subtilis, and one Gram negative bacterium Escherichia coli. Among them, the methanol extract of the leaves of Liriodendron tulipifera showed remarkably potent antibacterial activity against both Gram positive and negative bacteria.
Antimicrobial Activities of Hydroxybiphenyl Derivatives
Kihwan Bae,Sunghyen Koo,Wonjun Seo 한국생약학회 1986 생약학회지 Vol.17 No.1
It has been elucidated that magnolol and honokiol, isolated from the stem bark of Magnolia obovata, had potent antibacterial activity against a cariogenic bacterium Streptococcus mutans. They also show a significant antibacterial activity against Bacillus anthracis, which causes malignant pustule and woolsorter disease in human. Some hydroxybiphenyl derivatives are synthesized from starting materials, phenylphenols and biphenols by means of Claisen`s rearrangement and Elb`s method to develop more potent antibacterial chemicals and to investigate the structure-activity relationships. The introduction of allyl groups to the aromatic rings of starting materials shows increase of antibacterial activities, but the number and positions of them do not effect their activities. Furthermore, the introduction of hydroxy group to aromatic rings also increases the activity.
Kihwan Nam,Hyelin Oh,Wonseok Oh,Nohyoon Seong 한국경영정보학회 2019 한국경영정보학회 학술대회논문집 Vol.2019 No.11
Recommender systems reduce the information overload by providing users’ “top-pick” recommendations. However, selecting the “best” out of good options can be more challenging than separating good and bad ones. Based on the of attraction effects frameworks, we examine the effectiveness of recommender systems including “worstpicks”. The addition of an unfavored item may alleviate consumers’ cognitive load and ease comparisons—all of which means the improved performance of recommendation structures. For empirical validation, we employed a randomized field experiment involving 475,339 unique users, 93,282 fashion products and 25,854,168 total instances of exposure to recommendations. The findings show that the attraction effect (AE) model outperformed the rational choice (RC) equivalent. AE model was more effective on PCs than over mobile phones. For male consumers, the AE model outcompeted the RC equivalent, but such difference was not detected among female shoppers. Based on these findings, we discuss the theoretical and practical implications.