• Journal of Internet Computing and Services
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• v.21 no.4
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• pp.77-85
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• 2020

The purpose of this study is to explore the changing trajectory of using educational media through longitudinal data analysis. We categorize the feature of using educational media as usage for learning, usage for information, and usage for the game. We explore the longitudinal changing patterns of usage for learning, usage for information, and usage for the game by LGM(Longitudinal Growth Modeling). We also find the gender difference between these longitudinal changing trajectories. We used 3,499 samples of KYPS middle school second-grade panel data. We found these results: (a) Both usage for learning and information are statically significant variability in initial level and rate of change. Both of the changing trajectories have increased. (b) Girls have a higher rate of the change both in the usage of learning and information than boys over time. (c) There is a statistically significant individual variability in initial levels and rate of change in the usage of the game over time. (d) Boys have a higher rate of initial value than girls in the usage of games, but there is no significant difference in the rate of changing trajectories.

• Journal of Microbiology
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• v.43 no.3
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• pp.257-259
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• 2005

Although automated continuous-monitoring blood culture systems are both rapid and sensitive, false-positive and false-negative results still occur. The objective of this study, then, was to evaluate negative results occurring with BacT/Alert 3D blood culture systems. A total of 1032 samples were cultured with the BacT/Alert 3D automated blood culture system, using both aerobic (BPA) and anaerobic (BPN) media, and 128 of these samples yielded positive results. A total of 904 negative blood samples were then subcultured in $5\%$ sheep blood agar, eosin methylene blue, chocolate agar, and sabouraud-dextrose agar. Organisms growing on these subcultures were subsequently identified using both Vitek32 (bioMerieux, Durham, NC) and conventional methods. Twenty four $(2.6\%)$ of the 904 subcultures grew on the subculture media. The majority $(83.3\%)$ of these were determined to be gram-positive microorganisms. Fourteen $(58.3\%)$ were coagulase-negative staphylococci, two $(8.3\%)$ were Bacillus spp., one $(4.2\%)$ was Staphylococcus aureus, and one $(4.2\%)$ was identified as Enterococcus faecium. Streptococcus pneumoniae and Neisseria spp. were isolated together in two $(8.3\%)$ vials. Gram-negative microorganisms comprised $12.5\%$ of the subcultures, of which two $(8.3\%)$ were found to be Pseudomonas aeruginosa, and one $(4.2\%)$ was Pseudomonas fluorescens. The other isolate $(4.2\%)$ was identified as Candida albicans. We conclude that the subculture of negative results is valuable in the BacT/Alert 3D system, especially in situations in which only one set of blood cultures is taken.

• Journal of Preventive Medicine and Public Health
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• v.9 no.1
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• pp.77-86
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• 1976

This study was attempted to know that the interactions of various fungi, and methionine and $MgSO_4$ introduced as the substrate of culture media for fungi were affected to produce aflatoxins by Asp. flavus. 5 different fungi were isolated from the fermented soybean mash and were cultured in Chemically Defined medium (C. D. media) and soybean mash at $25^{\circ}C$ for 10 days. (1) It was confirmed that Asp. flavus produced aflatoxins in the C. D. medium and soybean mast, but that Asp. niger, Asp. oryzae, Asp. awamori and Asp. terreus did not produced them respectively. (2) Asp. flavus cultured with Asp. niger did not produce aflatoxins in C. D. medium, but produced in soybean mash, in other hand, Asp. flavus with other fungi except Asp. niger produced aflatoxins in C. D. medium and soybean mash. (3) The growth of fungi were more prosperous in the seperate culture than in the mixed culture. (4) In the C. D. medium added 20% of cultured medium of Asp. niger, Asp. flavus did not produce aflatoxins but other cultured medium did not prohibit the production of aflatoxins by Asp. flavus. (5) On the contrary, $MgSO_4$ increasing the productivity of aflatoxins by Asp. flavus in the C. D. medium, methionine known as one of precursor of aflatoxins did not affected the increasing productivity with significance.

• Broadcasting and Media Magazine
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• v.15 no.4
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• pp.9-22
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• 2010

최근 full-HD 3D 방송, UD(ultra-definition) 영상 서비스, mobile device 향 양방향 HD급 화상통신 등 기존 영상 서비스의 품질을 월등히 향상시키고자 하는 연구들이 진행되고 있다. 본 기고에서는 기존 H.264/AVC 영상 압축 표준의 성능을 2배 이상 향상시키는 것을 목표로 진행 중인 새로운 차세대 영상 압축 표준인 HEVC(high-efficiency video coding; MPEG-H/H.265)의 표준화 동향을 소개한다. 또한, 현재 HEVC test-model (HM) version 1을 구성하고 있는 요소 기술들을 결정하기 위해 진행되었던 성능 평가 과정에 대해 간략하게 소개하고, 마지막으로 HM의 전반적 구성 및 현재 성능 수준에 대한 평가결과를 보인다.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.04a
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• pp.799-802
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• 2016

It is definitely an interesting job to work with V4 to create various contents emphasizing different interfaces like 3D graphics, and multimedia such as video, audio, and camera. Moreover, beyond the other interface, as it could be used in the many aspects of the sensory sign such as visual effects, auditory effects, and touchable effects, it feels free to make a better developed model. We intended the users to feel some kind of pleasure and interactions rather than just using in aspect of Media art.

• Broadcasting and Media Magazine
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• v.20 no.3
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• pp.37-53
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• 2015

본 고에서는 사물인터넷과 관련된 한국, 미국, 일본 및 유럽 특허 분석을 통해 국가별, 응용분야별 기술개발 현황을 분석하였다. 특허검색 결과 총 101,245건이 검색되었으며 중복제거 및 필터링을 통하여 8,304건의 유효 분석대상 특허를 선별하였다. 사물인터넷의 응용분야를 기준으로 4개의 중분류로 기술체계를 수립하였으며, 중분류 내의 각 세부기술을 대상으로 분석을 수행하였다. 이를 통해 우리나라의 기술 수준, 선진 기업의 연구 개발동향 및 핵심특허 현황 등을 파악하여 객관적인 특허정보 제공과 사물인터넷 분야의 연구개발 방향을 제시한다.

• Broadcasting and Media Magazine
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• v.26 no.4
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• pp.61-71
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• 2021

영상, 비디오 정보로부터 3D 휴먼 모델을 생성하고 실제 사람 같이 움직이게 변형하는 기술은 다가오는 메타버스 시대의 핵심 기술이며, 이와 같은 기술이 갖는 잠재적인 파급력 때문에 많은 글로벌 IT 기업에서 앞다투어 관련 기술에 대한 투자를 진행하고 있다. 본 기고문에서는 지난 10년간 휴먼 모델링 기술이 어떻게 발전되어 왔는지 살펴보고 현재 기술의 특징 및 한계점과 함께 앞으로의 기술 전망에 대해 살펴본다.

• Broadcasting and Media Magazine
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• v.26 no.4
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• pp.40-47
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• 2021

디지털 트윈, 메타버스 등의 시대적 흐름에 대응하기 위해, 1)실사와 같은 실감성을 갖추고, 2)데이터 취득이 용이하며, 3)가벼운 데이터 저장 및 활용이 가능한 실내 공간 모델링의 필요성이 증대되고 있다. 본 기고에서는 상기 세 가지 조건을 만족하는 TeeVR이라는 기술에 대해 소개하고, 기술의 혁신을 가능하게 한 "구조 기반 접근법"에 대해 소개한다. 마지막으로 아파트에서 전시홀에 이르는 scalable한 적용 예시와 웹(web)이나 스마트 폰과 같은 제한된 환경에서도 사용자 만족도가 높은 다양한 응용 예시를 설명한다.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.24 no.4
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• pp.62-66
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• 1979

These studies were designed to define the effects of Benzyladenine and 2, 4-D on the induction and growth of callus tissue from embryos and plant segments of Korean ginseng. 0.5PPM was the minimum concentration of 2, 4-D for the induction of callus tissue from embryos and plant segments of ginseng. Best callus induction occurred at a 2, 4-D concentration of 5 mg/liter but growth of this callus was best at a 2, 4-D concentration of about 1.0 to 2.0 mg/liter and benzyladenine was ineffective as callus inducer. When the embryos were grown on the media containing 0.5 mg/liter of 2, 4-D, 5 to 6 axillary buds were formed at the basal part of epicotyle.

• Journal of Broadcast Engineering
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• v.14 no.1
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• pp.70-80
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• 2009

We propose an ideal line coding for high speed data communication in visible light communication system. B4-HBT line coding is defined as follow. The 1 bit is +V at first though 1 encodes +Voltage and -Voltage doing change of shift each other, then -V newly. V that is been mutually contradictory for 1 bit that exist before that if continuous 0 bits exist 4 here same and reduces mistake because has reverse mark V in 4 continuous last 0 bits and gives half bit variation in 1 bit and made effect of noise low. 2${\sim}$3 dB profit is seen comparing with line coding that exist in simulation result.