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A New Mobile Watermarking Scheme Based on Display-capture
Bae, Jong-Wook,Jung, Sung-Hwan Korea Multimedia Society 2009 멀티미디어학회논문지 Vol.12 No.6
Most of existing watermarking schemes insert and extract a watermark, focusing on the visual conservation of an original image. However, existing watermarking schemes could be difficult for a watermark detection in case of various distortion caused by display-capture devices. Therefore, we propose a new display-capture based mobile watermarking scheme. The proposed watermarking scheme is a new concept for embedding a watermark, which uses the generated image instead of a given original image. For effective watermark decoding, we also present a method for detecting the background image whose error bit can not be corrected because of various heavy distortion and for avoiding it from the decoding process. For this scheme, we adopt distortion coefficients of camera calibration when we separate a background image from a captured image. For finding available correction bits of ECC through the decoding process, we capture 30,000 images and then calculate the separation ratio of a background image and the average error bits per an image. As experimental result, the separation ratio of a background image is about 96.5% in 30,000 captured image. And the false alarm ratio shows about $5.18{\times}10^{-4}$ in the separated background image. And also we can confirm the availability of real-time processing because the mean execution time is about 82ms per an image for capturing and decoding.
Bae, Hyun Won,Kim, Dockyu,Choi, Ki Young,Kwon, Na Ra,Chae, Jong Chan,Zylstra, Gerben J.,Koh, Sung-Cheol,Lee, Choong-Hwan,Kim, Eungbin Oxford University Press 2007 FEMS microbiology letters Vol.266 No.1
<P>We identified a p-cumate degrading gene cluster (designated cmt) with a novel organization in our genomic studies of the terpene-degrading Rhodococcus sp. strain T104. The mutant strain SN140, isolated for the inability to grow on p-cumate, accumulates 2,3-dihydroxy-p-cumate as identified by liquid chromatography-mass spectrometry and 300 MHz proton nuclear magnetic resonance spectroscopy. Reverse transcriptase polymerase chain reaction experiments showed that the cmt genes are operonic and induced specifically by growth on p-cumate. This report is the first example of identifying the genes for p-cumate degradation in a gram-positive organism based on functional data.</P>
A Study on New Power Business Model Using Power Information Technology
Bae, Sung-Hwan,Kim, Ja-Hee,Lim, Han-Seung The Korean Institute of Electrical Engineers 2010 Journal of Electrical Engineering & Technology Vol.5 No.3
The Korea Electric Power Corporation (KEPCO) recorded 2.9 trillion won deficit in the aftermath of the world financial crisis. KEPCO is trying to escape from the business crisis in every way; however, it is impossible to make huge profit by selling electricity alone. Overseas electrical utilities make profits by selling gas and heat along with electricity. However, it is difficult for KEPCO to enter the gas and the heat selling market because other public companies are already dealing with them. In this situation, improving the business is possible when KEPCO develops a new business model and creates added value using Korean advanced Power IT combined with electricity. This study shows a new business model using Power IT, based on a survey targeting managers in KEPCO branch office and electrical engineers in the field. We hope the new business model suggested in this study is adapted to the real field to create high value in the future.
Bae Young-Soo,Yoon Sang Ho,Kim Young Sook,Oh Sung Pyo,Song Woo Seok,Cha Jin Hee,Kim Myoung-Hwan 생화학분자생물학회 2022 Experimental and molecular medicine Vol.54 No.-
Inborn errors of metabolism (IEMs) are common causes of neurodevelopmental disorders, including microcephaly, hyperactivity, and intellectual disability. However, the synaptic mechanisms of and pharmacological interventions for the neurological complications of most IEMs are unclear. Here, we report that metabolic dysfunction perturbs neuronal NMDA receptor (NMDAR) homeostasis and that the restoration of NMDAR signaling ameliorates neurodevelopmental and cognitive deficits in IEM model mice that lack aminopeptidase P1. Aminopeptidase P1-deficient (Xpnpep1–/–) mice, with a disruption of the proline-specific metalloprotease gene Xpnpep1, exhibit hippocampal neurodegeneration, behavioral hyperactivity, and impaired hippocampus-dependent learning. In this study, we found that GluN1 and GluN2A expression, NMDAR activity, and the NMDAR-dependent long-term potentiation (LTP) of excitatory synaptic transmission were markedly enhanced in the hippocampi of Xpnpep1–/– mice. The exaggerated NMDAR activity and NMDAR-dependent LTP were reversed by the NMDAR antagonist memantine. A single administration of memantine reversed hyperactivity in adult Xpnpep1–/– mice without improving learning and memory. Furthermore, chronic administration of memantine ameliorated hippocampal neurodegeneration, hyperactivity, and impaired learning and memory in Xpnpep1–/– mice. In addition, abnormally enhanced NMDAR-dependent LTP and NMDAR downstream signaling in the hippocampi of Xpnpep1–/– mice were reversed by chronic memantine treatment. These results suggest that the metabolic dysfunction caused by aminopeptidase P1 deficiency leads to synaptic dysfunction with excessive NMDAR activity, and the restoration of synaptic function may be a potential therapeutic strategy for the treatment of neurological complications related to IEMs.
Fungal Endophytes from Three Cultivars of Panax ginseng Meyer Cultivated in Korea
Sang Un Park,Hyoun-Sub Lim,Kee-Choon Park,Young-Hwan Park,Hanhong Bae 고려인삼학회 2012 Journal of Ginseng Research Vol.36 No.1
In order to investigate the diversity of endophytes, fungal endophytes in Panax ginseng Meyer cultivated in Korea were isolated and identifi ed using internal transcribed spacer (ITS) sequences of ribosomal DNA. Three cultivars of 3-year-old ginseng roots (Chunpoong, Yunpoong, and Gumpoong) were used to isolate fungal endophytes. Surface sterilized ginseng roots were placed on potato dextrose agar plates supplemented with ampicilin and streptomycin to inhibit bacterial growth. Overall, 38 fungal endophytes were isolated from 12 ginseng roots. According to the sequence analysis of the ITS1-5.8S-ITS2, 38 fungal isolates were classifi ed into 4 different fungal species, which were Phoma radicina, Fusarium oxysporum, Setophoma terrestris and Ascomycota sp. 2-RNK. The most dominant fungal endophyte was P. radicina in 3 cultivars. The percentage of dominant endophytes of P. radicina was 65.8%. The percentage of colonization frequency of P. radicina was 80%, 52.9%, and 75% in Chunpoong, Yunpoong, and Gumpoong, respectively. The second most dominant fungal endophyte was F. oxysporum. The diversity of the fungal endophytes was low and no ginseng cultivar specifi city among endophytes was detected in this study. The identifi ed endophytes can be potential fungi for the production of bioactive compounds and control against ginseng pathogens.
( Bae Hwan Kim ),( Woo Chan Son ),( Cha Ok Yim ),( Sung Keun Kang ),( Jeong Chan Ra ),( Young Chul Kim ) 한국조직공학과 재생의학회 2010 조직공학과 재생의학 Vol.7 No.5
The potential anti-wrinkle effects of adipose tissue-derived mesenchymal stem cells (AdMSCs) have recently been reported. In the present study, we demonstrated a protective effect of AdMSCs in a UV irradiationinduced hairless mouse wrinkle model. Mice treated with AdMSCs showed improvements in skin erythema index, moisture capacity and transepidermal water loss. The AdMSC-treated mice showed reduced wrinkle area, as measured by gross observation and replica image analysis, and had a thinner epidermis and increased collagen and elastic fiber content, compared with the control group, as measured by histopathological examination. These results suggested that AdMSCs may be effective in the treatment of wrinkles. The activity of AdMSCs was further confirmed by the reduction in MMP-3 mRNA expression in the skin of the AdMSC treated animals, which suggests that AdMSCs can protect the collagen from degradation induced by UV irradiation. Further studies will investigate detailed mechanisms of action of AdMSCs, with particular focus on AdMSC-derived secretory factors.