• 문화기술의 융합
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• 제10권3호
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• pp.391-396
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• 2024

본 연구에서는 헬스케어 분야에 특화된 개체명 사전을 구축하기 위해 기존 N-Gram 방식의 한계를 극복하고 성능을 향상하게 시키기 위해 새로운 역 N-Gram 방식을 제안하였다. 제안된 역 N-Gram 방식은 헬스케어 관련 빅데이터의 복잡한 언어적 특성을 더 정밀하게 분석하고 처리할 수 있다. 제안된 방식의 효율성 검증을 위해 매년 1월에 개최되는 소비자 가전 전시회(Consumer Electronics Show: CES) 기간 동안 발표된 헬스케어 및 디지털 헬스케어 관련 빅데이터를 수집하기 위하여 뉴스를 대상으로 2010년 1월 1일부터 31일, 그리고 2024년 1월 1일부터 31일까지 언급된 2,185건의 뉴스 제목 및 요약문을 파이썬 프로그래밍언어로 새로운 역 N-Gram 방식을 구현하여 전처리한 결과, 헬스케어 분야에서의 자연어 처리를 위한 사전이 안정적으로 구축되었음을 확인할 수 있었다.

• 한국응용약물학회:학술대회논문집
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• 한국응용약물학회 1998년도 Proceedings of UNESCO-internetwork Cooperative Regional Seminar and Workshop on Bioassay Guided Isolation of Bioactive Substances from Natural Products and Microbial Products
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• pp.133-133
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• 1998

Tylopeptins A and B are novel peptides from methanol extract of fruit body of mushroom, Tylopilus neofelleus, These novel peptides were isolated by reverse-phase HPLC. And they have been shown to consist of one acetylated N -terminal residue, fourteen amino acids, and leucinol, C-terminal amino alcohol. Sequencial determination and complete 1H and 13C resonance assignments were based on positive ion F AB mass spectroscopy and two dimensional NMR techniques using HOHAHA, ROSEY, HMQC, and HMBC. These compounds are active against some Gram-positive bacteria, but inactive against phathogenic fungi and Gram-negative bacteria.

• Journal of Microbiology and Biotechnology
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• 제10권4호
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• pp.539-543
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• 2000

A new bacteriocin, named lacticin 10790, was purified from Lactococcus lactis subsp. cremoris KFCC 10790 by sequential adsorption, immobilized metal-affinity, cation-exchange, and $C_{18}$ reverse-phase chromatographies. The molecular mass of the bacteriocin was estimated to be between 3,000 and 3,500 Da. Lacticin 10790 showed a broad antimicrobial spectrum against many gram-positive bacteria. The bacteriocin was stable to heat and in the pH range between 2 and 6. Lacticin 10790 was destroyed by digestion with proteases and exhibited a bactericidal mode of action. An amino acid composition analysis of purified lacticin 10790 revealed a high concentration of hydrophobic amino acids. The N terminus of the bacteriocin was found to be blocked, upon analysis by Edman degradation. The results suggest that lacticin 10790 is a class I bacteriocin.

• Journal of Microbiology and Biotechnology
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• 제20권2호
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• pp.271-280
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• 2010

Vibrio alginolyticus, a Gram-negative marine bacterium, is one of the causative agents of fish vibriosis. Its virulence factors and pathogenesis mechanism are barely known, except for some extracellular products (ECPs) that are known to be regulated by quorum sensing system. Therefore, the present study used a microarray to analyze the transcription profiles of the wild-type V. alginolyticus and a deletion mutant of luxO, the pivotal regulator in Vibrio quorum sensing systems, which resulted in the identification of a putative virulence factor, MviN. Quantitative real-time reverse transcription PCR confirmed that the transcription of mviN was upregulated in the luxO mutant when compared with wild-type, and down regulated in a luxO-con complemented strain. Furthermore, Western blotting indicated that MviN was greatly induced during the late-exponential and stationary phases of growth, indicating that the expression of MviN was cell-density dependent and quorum sensing regulated in V. alginolyticus. Meanwhile, the mviN null mutant displayed a much slower growth rate than the wild type, signifying the essential role of MviN in V. alginolyticus. Western blotting also revealed that MviN was present as an extracellular protein in V. alginolyticus. When epithelioma papulosum cyprini (EPC) cells were treated with the ECPs of the mviN mutant, no cytotoxicity was observed, whereas EPC cells treated with the wild type exhibited pathological changes, which increased with the ECPs concentration and treatment time. Therefore, the results demonstrated that MviN is a LuxO-regulated ECPs component and involved in the pathogenicity of V. alginolyticus.

• Journal of Microbiology and Biotechnology
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• 제9권6호
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• pp.804-810
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• 1999

There is a possibility that carvone, a monoterpene from spearmint (Mentha spicata), could induce the bph degradative pathway and genes in Alcaligenes eutrophus H850, which is a known Gram-negative PCB degrader with a broad substrate specificity that was thoroughly investigated with Arthrobacter sp. BIB, a Gram-positive PCB degrader. The strains BIB and H850 were unable to utilize and grow on the plant terpene [(R)-(-)-carvone] (50ppm) to be recognized as a sole carbon source. Nevertheless, the carvone did induce 2,3-dihydroxybiphenyl 1,2-dioxygenase (encoded by bphC) in the strain B lB, as observed by a resting cell assay that monitors accumulation of a yellow meta ring fission product from 4,4'-dichlorobiphenyl (DCBp). The monoterpene, however, did not appear to induce the meta cleavage pathway in the strain H850. Instead, an assumption was made that the strain might be using an alternative pathway, probably the ortho-cleavage pathway. A reverse transcription (RT)-PCR system, utilizing primers designed from a conserved region of the bphC gene of Arthrobacter sp. M5, was employed to verify the occurrence of the alternative pathway. A successful amplification (182bp) of mRNA transcribed from the N-terminal region of the bphC gene was accomplished in H850 cells induced by carvone (50ppm) as well as in biphenyl-growth cells. It is, therefore, likely that H850 possesses a specific PCB degradation pathway and hence a different substrate specificity compared with B1B. This study will contribute to an elucidation of the dynamic aspects of PCB bioremediation in terms of roles played by PCB degraders and plant terpenes as natural inducer substrates that are ubiquitous and environmentally compatible.

• Journal of Microbiology and Biotechnology
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• 제20권7호
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• pp.1061-1068
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• 2010

The biological synthesis of nanoparticles has gained considerable attention in view of their excellent biocompatibility and low toxicity. We isolated and purified rhamnolipids from Pseudomonas aeruginosa strain BS-161R, and these purified rhamnolipids were used to synthesize silver nanoparticles. The purified rhamnolipids were further characterized and the structure was elucidated based on one- and two-dimensional $^1H$ and $^{13}C$ NMR, FT-IR, and HR-MS spectral data. Purified rhamnolipids in a pseudoternary system of n-heptane and water system along with n-butanol as a cosurfactant were added to the aqueous solutions of silver nitrate and sodium borohydride to form reverse micelles. When these micelles were mixed, they resulted in the rapid formation of silver nanoparticles. The synthesized nanoparticles were characterized by UV-Visible spectroscopy, transmission electron microscopy, and energy dispersive X-ray spectroscopy (EDS). The nanoparticles formed had a sharp adsorption peak at 410 nm, which is characteristic of surface plasmon resonance of the silver nanoparticles. The nanoparticles were monodispersed, with an average particle size of 15.1 nm (${\sigma}={\pm}5.82$ nm), and spherical in shape. The EDS analysis revealed the presence of elemental silver signal in the synthesized nanoparticles. The formed silver nanoparticles exhibited good antibiotic activity against both Grampositive and Gram-negative pathogens and Candida albicans, suggesting their broad-spectrum antimicrobial activity.

• International Journal of Computer Science & Network Security
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• 제23권7호
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• pp.186-192
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• 2023

Malwares are becoming a major problem nowadays all around the world in android operating systems. The malware is a piece of software developed for harming or exploiting certain other hardware as well as software. The term Malware is also known as malicious software which is utilized to define Trojans, viruses, as well as other kinds of spyware. There have been developed many kinds of techniques for protecting the android operating systems from malware during the last decade. However, the existing techniques have numerous drawbacks such as accuracy to detect the type of malware in real-time in a quick manner for protecting the android operating systems. In this article, the authors developed a hybrid model for android malware detection using a decision tree and KNN (k-nearest neighbours) technique. First, Dalvik opcode, as well as real opcode, was pulled out by using the reverse procedure of the android software. Secondly, eigenvectors of sampling were produced by utilizing the n-gram model. Our suggested hybrid model efficiently combines KNN along with the decision tree for effective detection of the android malware in real-time. The outcome of the proposed scheme illustrates that the proposed hybrid model is better in terms of the accurate detection of any kind of malware from the Android operating system in a fast and accurate manner. In this experiment, 815 sample size was selected for the normal samples and the 3268-sample size was selected for the malicious samples. Our proposed hybrid model provides pragmatic values of the parameters namely precision, ACC along with the Recall, and F1 such as 0.93, 0.98, 0.96, and 0.99 along with 0.94, 0.99, 0.93, and 0.99 respectively. In the future, there are vital possibilities to carry out more research in this field to develop new methods for Android malware detection.

• 한국응용곤충학회지
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• 제9권2호
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• pp.57-74
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• 1970

본 실험은 볍씨를 Dimethoate 액에 침지처리하였을 경우 약제의 침투량 및 볍씨의 발아생리에 미치는 여러 가지 요인의 영향을 추정하기 위해 수도품종 12개를 공시하여 침지시간, 농도 및 온도에 따르는 약제침투량 그리고 처리에 의한 볍씨의 발아생리에 미치는 영향에 관하여 실험하여 다음과 같은 결과를 얻었다. 1) Dimethoate 침투량은 공시품종에 따라 현저한 차이가 있으며 볍씨 100입당 약제침투량은 수성>관옥>농광>진흥>팔달>승판 5호>수원 82호>농림 6 호>시로가네>신 2호>풍광>재원의 순서 이었고 종자당 약제 침투량은 대립종에서 많았고 소립종에서 적었으며 1g당 약제침투량은 그와 반대로 소립종에서 많았다. 약제침투량과 볍씨의 흡수율과의 상관은 $\gamma=+0.35$로 낮았다. 2) 약제침투량은 침지시간, 농도 및 온도에 따라 차이가 있었으며 특히 처리온도의 영향이 컸다. $0.1\%$ Dimethoate에 48시간 침지처리하였을때 볍씨 1g당 약제 침투량은 $15^{\circ}C$에서는 0.174mg, $20^{\circ}C$술에서는 0.208mg 및 $30^{\circ}C$에서는 0.397mg이었다. 3) Dimethoate처리가 볍씨의 발아에 미치는 영향은 품종에 따라 현저한 차이가 있었는데 발아저해도의 순위는 $0.1\%$ Dimethoate액에서 24시간 처리의 경우 팔달>수원 82 호>진흥>풍광>재건>시로가네>농광> 농림 6 호>신 2호>수성>승판 5호>관옥이었고 48시간 처리의 경우 진흥>승판 5호>수원 82호>팔달>농광>재건>신 2호>관옥>시로가네>풍광>수성>농림 6호이었으며 발아저해도와 약제침투량간의 상관은 $\gamma=0.683$로 유의하였다. 4) Dimethoate처리$(30^{\circ}C,\;0.2\%$액에서 24시간)에 의하여 볍씨의 발아가 억제되었으며 평균발아속도는 약 2일 지연되었고 그 정도는 품종에 따라 차이가 있었다. 5) 공시품종의 발아속도와 발아저해율과는 정의 정관$(\gamma=+0.78$을 나타내었으며 발아속도가 빠른 품종에서 발아저해율이 낮았고 딴대로 발아속도가 늦은 품종에서 발아저해가 심하였다. 6) 공시품종의 화학적조성중 단백질이 발아저해도와 가장 관계가 깊었는데 단백질의 함량이 낮은 품종은 Dimethoate에 의한 발아저해가 높은 경향을 보였다. 7) 공시품종의 KOH 붕괴도는 품종간에 현저한 차이가 있었으며 KOH 붕괴도가 큰 품종이 발아저해가 심하고 작은 품종은 덜한 경향을 보였다. 또한 KOH 붕괴도와 단백질 함량과는 $\gamma=-0.422$의 높은 상관을보였다. 8) 공시품종의 산소호흡량은 품종에 따라 현저한 차이가 있었으며 Dimethoate처리$(30^{\circ}C,\; 0.2\%$액에서 24시간)에 의하여 볍씨의 호흡량이 감소되었다. 9) 산소호흡량과 평균발아소요일수와는 $\gamma=-0.945$로 부의 유의한 상관을 보였는데 산소호흡량이 많은 품종은 평균발아소요일수가 짧은 경향을 보였다. 10) 볍씨의 산소호흡량과 Dimethoate 처리에 의한 볍씨의 발아저해도와는 $\gamma=-0,771$의 높은 부의 상관을 보였으며 산색호흡량이 많은 품종이 발아저해도가 낮고 적은 품종에서는 높았다.