• Biotechnology and Bioprocess Engineering:BBE
• /
• v.10 no.6
• /
• pp.582-586
• /
• 2005

In this Study, we have attempted to determine the effects of dietary fructose polymers (fructan), high molecular-weight ${\beta}-(2,6)-linked$ levan, and low-molecular-weight ${\beta}-(2,1)-linked$ inulin, on two intestinal enzymes $({\beta}-glucuronidase\;and\;{\beta}-glucosidase)$. As a preliminary experiment, when intestinal microflora were cultured in anaerobic media harboring levan or its oligosaccharides, bacterial cell growth was observed in the levanoligosaccharide-supplemented media, but not in the levan-supplemented media, indicating that levan's size is important for the utilization by intestinal bacteria of levan as an energy Source. In our animal study, the intake of a levan-rich diet was determined to significantly attenuate the activity of the harmful enzyme $({\beta}-glucuronidase$, but d id not affect the activity of ${\beta}-glucosidase$.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.13 no.2
• /
• pp.114-117
• /
• 2005

Air cleaners in all of the automotive engines have been used for decades. In the early 1920's the oil bath type was the popular shape of air cleaners. The air cleaners of the oil wetted bath type were introduced in 1940's. The shape of the dry pleated paper type media was introduced in the 1950's. This trend still continues with new and innovative media being introduced. Engine air cleaners should have effectively removed and reduced harmful contaminants being ingested into engines. This studies show that both, the ingested contaminant size and concentration need to be controlled. This paper com pare and analyze the characteristics over the economics, engine performances and reduction of noises of power-plus air filters with wet paper which were sticked to heavy duty diesel engine.

• Corrosion Science and Technology
• /
• v.2 no.3
• /
• pp.127-134
• /
• 2003

In order to explain the effect of alloying Cu on the corrosion resistance of stainless steels in chloride media for both ferritic and austenitic stainless steels, the corrosion behavior of Cu-bearing stainless steels was investigated. Alloying Cu showed beneficial effect in an active potential range and harmful effect in a noble potential range. The beneficial effect of alloying Cu was explained by the stability of deposited Cu on an anodic surface. Difference in the effect of alloying Cu between the ferritic and austenitic steels was ascribed by the differences in their corrosion potentials and the morphology of the deposited Cu.

• Journal of the Korea Convergence Society
• /
• v.9 no.2
• /
• pp.145-150
• /
• 2018

Recently, it has been continually researched that the advertising regulation should be tightened since suggestive advertising in Internet affect more negatively juveniles. Most of the researches seem to overlook an important fact that the objects of the researches, suggestive advertising are different from the harmful advertising to juveniles defined by the Juvenile Protection Act because they approached with ethical perspectives, not legally. It can be judged that the suggestive advertising in the past researches are not actually harmful advertising regulated by the Act, so the suggestive advertising should be properly managed for protecting juveniles, not banned. In this context, this study suggested that more proper and reasonable advertising regulations in Internet environment for protecting juveniles, with reviewing the problems of regulation system of media product harmful to juveniles, focusing on the differences between 'suggestive' and 'harmful' advertising to juveniles by the Act.

• The Journal of the Korea Contents Association
• /
• v.21 no.8
• /
• pp.515-525
• /
• 2021

The study examines how the discourse on infants' smart media use has been constructed under media-saturated situations. Infants' use of smart media has been regarded as a dangerous activity, rate of overdependence has been increasing. Newspapers during the recent three years (2018-20) were analyzed. The most prominent speakers in the news field were smart media content producers and platform operators. There were negative views and concerns about infants' smart media use by academics, civic groups, and parents. However, the industry went beyond these risk discourses and gave positive meaning: Smart media was redefined as safe media for infants and reliable childcare helpers for parents. Parents were portrayed as those responsible for their children's media use and in need of help for childcare, rather than being blamed for their children's overdependence on smart media. Digital parenting seems to be emerging as an acceptable and practicable way of childcare rather than harmful and incomplete parenting.

• ETRI Journal
• /
• v.38 no.1
• /
• pp.112-122
• /
• 2016

This paper presents a set of candidate regulatory requirements for TV band devices (TVBDs) in the Rep. of Korea. To guarantee the protection of incumbent services, especially digital TV (DTV) and wireless microphones, in TV frequency bands, we suggest minimum separation distances of TVBDs from the noise-limited contour according to incumbent users and TVBD types. This paper also deals with multiple sets of separation distances of a co-channel TVBD network from a DTV protected contour on the basis of the radio propagation characteristics of different geographic areas to make good use of TV white space (TVWS) and safely protect the DTV service. We present a low-power transmission mode of TVBDs and the relevant separation distances for small-cell deployment. The service coverage reduction ratio of a TVBD network is investigated in the presence of DTV interference in four geographic areas. The TVWS field verification results, conducted on the island of Jeju (Rep. of Korea), show that incumbent services operate well without harmful interference from neighboring TVBDs with the proposed separation distances.

• Journal of Digital Convergence
• /
• v.17 no.10
• /
• pp.127-139
• /
• 2019

This study aims to explore the impressive experiences of university students on YouTube media and to find ways to improve personal media as useful consumer information. 44 university students were selected, and data on the experience of using YouTube were collected and analyzed by applying the critical incident technique. As a result, the positive responses to personal media were derived from 'enhancing C2C information capabilities', 'consumer-centric usability', 'attractive information creators', 'a sense of the sameness', and 'fresh and entertaining information'. Negative responses were derived from 'spreading of harmful information', 'distrust in information creators', 'inducing excessive advertising and impulse buying', 'media addiction' and 'relative deprivation'. In addition, improvement of the personal media has been suggested. This study has differentiation and significance as a qualitative data for understanding consumer's perception and experience of personal media.

• Journal of information and communication convergence engineering
• /
• v.21 no.3
• /
• pp.192-197
• /
• 2023

A Distributed reflection denial of service (DRDoS) is a variant of DDoS attacks that threatens the availability of services to legitimate users. In response to this evolving threat landscape, the cybersecurity industry and service providers have intensified their efforts to develop effective countermeasures. Despite these efforts, attackers continue to innovate, developing new strategies and tools while becoming more sophisticated. Consequently, DRDoS attacks continue to be harmful. Therefore, ongoing research and development is essential to improve defense against DRDoS attacks. To advance our understanding and analysis of DRDoS attacks, this study examines the unique characteristics of DRDoS attacks and quantifies the risks involved. Additionally, it adopts a quantitative rather than traditional qualitative methods to derive and apply risk, particularly the probability of loss that can be caused by DRDoS attacks.

• Journal of Digital Convergence
• /
• v.15 no.12
• /
• pp.477-487
• /
• 2017

This study is for empirical analyzing the ethical contents in using social media, such as what kind of ethical responsibility do the teenage users have, how do they recognize the ethical concept in producing or sharing the information and how these ethical factors affect their behavior of social media uses. After survey with the structured questionnaire, statistical analyses with available 227 cases are processed. As a result, there are 4 ethical factors in using social media which as included 'privacy', 'copyright', 'fullness', 'accuracy', 'truth-telling', 'fairness', 'relief of harmful effect', 'credibility', 'objectivity', 'impartiality', included 'moderation', 'respect', 'autonomy', 'control', 'care of mischief', included 'interactivity', 'multiplicity', 'anonymity', 'divergence', 'social community', included 'transparency', 'openness'. All these ethical factors are positive correlated to the level of social media users' opinion expression, opinion support, information leading, information searching. Especially, is the most effective factor to social media users' behavior.

• Journal of Embryo Transfer
• /
• v.6 no.1
• /
• pp.33-40
• /
• 1991

In vitro developmental ability of early preimplantation monse embryos was shown to be depend on the embryonic stages, media and snpplements and their interaction(Experiment 1). The development of I-cell embryos were more promoted in the complex medinm(Ham's Fl0) than in the simple one(m-KRB), but that of 2-cell embryos showed the reverse effect. The bovine serum albumin(BSA) as a medium snpplement more promoted the development of I- and 2-cell embryos, compared with human fetal cord serum(HCS). On the other hand, the harmful effect of HCS was especially shown on the early cleavage in the embryonic development of the two stages. The effect of serum, in the respect of interaction between media and snpplements. was also more significantly appeared in m-KRB than Ham's Fl0. In the experiment 2, when the harmful effect of HCS was compared with that of fetal bovine serum(FBS), the former more promoted the development of l - and 2-cell embryos than the latter. The effect of HCS was more significantly shown in the development of I-cell than that of 2-cell embryos. Conclusively, as I- and 2-cell embryos were different in the requirements for the in vitro development. the optimal medium and supplement have to be selected for each embryonic stage. It is also respected to the better result if it take into consideration into the kinds of sera when serum is used for culture of early preimplantation embryos.