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Chaotic‐Maps‐Based Hash Function and Its Application
Yanzhang Pan,Minglu Jin,Junrong Gu 한국어정보학회 2007 한국어정보학 Vol.9 No.1
A new hash algorithm with private key is proposed based on chaotic‐mapping, by reshaping a piece‐wise linear chaotic mapping. This algorithm based on the cipher block chain mode makes the iteration initial point as the private key, encrypts arbitrary length plaintext data to 128 bits hash value. The proposed algorithm encrypts multi‐bit at one time, which reduces the chaotic iterating times and improves the encryption speed. Through theoretical analysis and simulation results, the proposed hash function could satisfy the requirements of unidirectionality, initial value and key sensitivity, anti‐collision and real time, which could be applied to the identity authentication conveniently, safely and efficiently.
Lee, Su-Jin,Pan, Jae-Gu,Park, Seung-Hwan,Choi, Soo-Keun Elsevier 2010 Journal of biotechnology Vol.149 No.1
<P><B>Abstract</B></P><P><I>Bacillus thuringiensis</I> produces crystal proteins (Cry) that account for up to 25% of the dry cell weight during the stationary phase. The high-level expression and stationary phase-specific autoinduction of the <I>cry</I> gene led to development of a <I>cry</I> promoter-based <I>Bacillus</I> expression system. Among the various <I>cry</I> promoters, <I>cry3Aa</I> promoter was selected by comparing the <I>lacZ</I> expression levels in <I>Bacillus subtilis</I>. An extracellular enzyme cellulase was highly upregulated during the stationary phase while under control of the <I>cry3Aa</I> promoter. Improvement of the <I>cry3Aa</I> promoter was obtained by modification of the promoter sequence. Specifically, a 5-fold increase in <I>lacZ</I> expression was obtained by changing both the −35 and −10 boxes of the <I>cry3Aa</I> promoter to the consensus sequence of the σ<SUP>A</SUP>-dependent promoter of <I>B. subtilis</I>. The modified <I>cry3Aa</I> promoter produced a significantly higher yield of AprE, which suggests that the promoter may be useful for high-level protein expression in <I>B. subtilis</I>.</P>
임베디드 모듈 기반 지능형 영상감시 시스템의 최적화에 관한 연구
김진수,김민구,반성범,Kim, Jin Su,Kim, Min-Gu,Pan, Sung Bum 한국스마트미디어학회 2018 스마트미디어저널 Vol.7 No.2
기존 사건 사고를 예방하기 위한 감시 시스템은 한 사람이 여러 대의 CCTV를 감시할 경우 22분 후에는 95%를 발견하지 못하는 문제점이 있다. 이를 해결하기 위해 비정상적인 상황이 발생할 경우 알림을 주는 컴퓨터 기반 지능형 영상감시 시스템에 대한 연구가 이루어지고 있지만, 소비전력 및 비용 등의 단점이 있어 실제 환경에서 활용하기에는 어려움이 있다. 이에 대한 대책으로 소형 디바이스 기반 지능형 영상감시 시스템에 대한 연구가 진행되고 있다. 본 논문에서는 침입자 검출, 화재 검출, 배회 낙상 검출을 수행하는 임베디드 모듈 기반 지능형 영상감시 시스템을 구현한다. 또한, 실시간 처리를 위해 알고리즘 및 임베디드 모듈 최적화 방법을 적용한다. 임베디드 모듈 기반 지능형 영상감시 시스템을 라즈베리파이에 구현하였으며, 알고리즘 처리 시간은 최적화 전 라즈베리파이 0.95초, 최적화 후 라즈베리파이 0.47초로 최적화 전 후 비교 결과 50.52% 처리 시간이 감소되었다. 따라서, 임베디드 모듈 기반 지능형 영상감시 시스템의 실시간 구동 가능성을 확인하였다. The conventional CCTV surveillance system for preventing accidents and incidents misses 95% of the data after 22 minutes where one person monitors multiple CCTV. To address this issue, researchers have studied the computer-based intelligent video surveillance system for notifying people of the abnormal situation. However, because the system is involved in the problems of power consumption and costs, the intelligent video surveillance system based on embedded modules has been studied. This paper implements the intelligent video surveillance system based on embedded modules for detecting intruders, detecting fires and detecting loitering, falling. Moreover, the algorithm and the embedded module optimization method are applied to implement real-time processing. The intelligent video surveillance system based on embedded modules is implemented in Raspberry Pi. The algorithm processing time is 0.95 seconds on Raspberry Pi before optimization, and 0.47 seconds on Raspberry Pi after optimization, reduced processing time by 50.52%. Therefore, this suggests real processing possibility of the intelligent video surveillance system based on the embedded modules is possible.
Jeong, Young-Su,Choi, Su-Lim,Kyeong, Hyun-Ho,Kim, Jin-Hyun,Kim, Eui-Joong,Pan, Jae-Gu,Rha, Eugene,Song, Jae Jun,Lee, Seung-Goo,Kim, Hak-Sung Oxford University Press 2012 Protein engineering, design & selection Vol.25 No.11
<P>Synthetic organophosphates (OPs) have been used as nerve agents and pesticides due to their extreme toxicity and have caused serious environmental and human health problems. Hence, effective methods for detoxification and decontamination of OPs are of great significance. Here we constructed and used a high-throughput screening (HTS) system that was based on phenolics-responsive transcription activator for directed evolution of OP-degrading enzymes. In the screening system, phenolic compounds produced from substrates by OP-degrading enzymes bind a constitutively expressed transcription factor DmpR, initiating the expression of enhanced green fluorescent protein located at the downstream of the DmpR promoter. Fluorescence intensities of host cells are proportional to the levels of phenolic compounds, enabling the screening of OP-degrading enzymes with high catalytic activities by fluorescence-activated cell sorting. Methyl parathion hydrolase from Pseudomonas sp. WBC-3 and p-nitrophenyl diphenylphosphate were used as a model enzyme and an analogue of G-type nerve agents, respectively. The utility of the screening system was demonstrated by generating a triple mutant with a 100-fold higher k(cat)/K(m) than the wild-type enzyme after three rounds of directed evolution. The contributions of individual mutations to the catalytic efficiency were elucidated by mutational and structural analyses. The DmpR-based screening system is expected to be widely used for developing OP-degrading enzymes with greater potential.</P>
Moon, Youngkwang,Jafry, Ali Turab,Bang Kang, Soon,Young Seo, Jin,Baek, Kyung-Youl,Kim, Eui-Joong,Pan, Jae-Gu,Choi, Jae-Youl,Kim, Hyun-Ji,Han Lee, Kang,Jeong, Keunhong,Bae, Se Won,Shin, Seunghan,Lee, J Elsevier 2019 Journal of hazardous materials Vol.365 No.-
<P><B>Abstract</B></P> <P>A region suffering from an attack of a nerve agent requires not only a highly sorptive material but also a fast-acting catalyst to decontaminate the lethal chemical present. The product should be capable of high sorptive capacity, selectivity and quick response time to neutralize the long lasting harmful effects of nerve agents. Herein, we have utilized organophosphorus hydrolase (OPH) as a non-toxic bio-catalytic material held in with the supporting matrix of poly-β-cyclodextrin (PCD) as a novel sorptive reinforced self-decontaminating material against organophosphate intoxication. OPH coated PCD (OPH-PCD) will not only be providing support for holding enzyme but also would be adsorbing methyl paraoxon (MPO) used as a simulant, in a host-guest inclusion complex formation. Sorption trend for PCD revealed preference towards the more hydrophobic MPO against <I>para</I>-nitrophenol (pNP). The results show sorption capacity of 1.26 mg/g of 100 μM MPO with PCD which was 1.7 times higher compared to pNP. The reaction rate with immobilized OPH-PCD was found to be 23% less compared to free enzyme. With the help of OPH-PCD, continuous hydrolysis (100%) of MPO into pNP was observed for a period of 24 h through packed bed reactor with good reproducibility and stability of enzyme. The long-term stability also confirmed its stable nature for the investigation period of 4 days where it maintained activity. Combined with its fast and reactive nature, the resulting self-decontaminating regenerating material provides a promising strategy for the neutralization of nerve agents and preserving the environment.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Synthesis of non-toxic, sorptive reinforced self-decontaminating material is reported. </LI> <LI> Organophosphorus hydrolase (OPH) enzyme is immobilized onto poly-β-cyclodextrin (PCD) by physical entrapment. </LI> <LI> PCD provides a unique and robust support for OPH enzyme and acts as a regenerative sorption material. </LI> <LI> OPH-PCD system shows high sorption and remarkably fast degradation of MPO. </LI> <LI> OPH-PCD is extremely stable for long term usage. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>