Streptococcus salivarius의 요소분해효소 활성에 관한 연구

정상백,최호영,민병순,박상진,이진용,최기운 大韓齒科保存學會 1998 Restorative Dentistry & Endodontics Vol.23 No.1

Dental caries is induced by organic acids produced by oral bacteria. In order to prevent dental caries, therefore, it is essential to maintain neutral pH in the oral cavity. Urea plays a major role in oral pH homeostasis. Urea is hydrolyzed by bacterial ureases to ammonia, causing a pH elevation, Streptococcus salivarius has been shown to be a major contribution to oral ureolysis. Synthesis of urease by S. salivarius appears to be constituitive, but can be greatly enhanced by low pH. It is, therefore, conceivable that ureolytic activity of S. salivarius from a carious lesion is greater than that of the bacterium from a healthy tooth. In the present study, urease activity of S. salivarius isolates from dental plaque of carious lesions was compared with that of the isolates from plaques of the teeth and the dorsum of the tongue; 45 S. salivarius strains were isolated from carious lesions(>C2) of 21 individuals with dental caries and 30 strains from 10 individuals without dental caries. The results were as follows: 1. All the 21 individuals with dental caries harbored ureolytic S. salivarius whereas 3 of 13 individuals without dental caries harbored non-ureolytic strains of S. salivarius. 2. All the 45 S. salivarius isolates from carious lesions showed urease activity. In contrast, of 30 isolates from individuals without dental caries, 17 isolates(56.7%) did not demonstrate urease activity, or if any, very little(<5μmol/min/mg). 3. Urease activity of the isolates from carious lesions was greater than that of the isolates from individuals without dental caries:the urease activity ranged from 42 to 381μmol/min/mg and from 0 to 208μmol/min/mg, respectively. 4. At acid pH(5.5), the isolates which showed intermediate urease activity at pH 7.0 demonstrated even higher activity whereas the isolate with no or lower urease activity did not show any significant difference in their activity. However, the isolates with the greatest urease activity from both individuals with and without dental caries, exhibited a rather much lower urease activity at pH 5.5. The overall results suggest that isolates may have their own urease activity but the isolates exposed to chronic acidic environment of the carious lesion might elevate urease activity of S. salivarius, which in turn, might influence on survival of S. salivarius itself and other bacteria establishing a new oral bacterial ecosystem.

CuInS_2 박막 제조 및 그 특성

정해덕,박계춘,조재철,정운조,김성구 木浦大學校 工業技術硏究所 1992 工業技術硏究誌 Vol.2 No.-

The polycrystalline CuInS_2 thin films are prepared by vacuum heat treatment of layer, which is deposited by vaccum evaporation in order. The electrical and optical properties of the films are investigated at various sulfur deposition mole rate, substrate temperature, heat treatment temperature and time. From data, n type- CuInS_2 exhibits resistivity, transmittance and energy band gap with 142[Ωㆍ㎝], 73[%], and 1.5[eV] respectively at optimum fabrication condition. Finally, the films are fabricated with chalcopyrite structure.

패키지디자인에 나타난 B.I차별화 전략연구 : 샴푸 개발사례를 중심으로

정운성 한국패키지디자인학회 2002 상품문화디자인학연구 Vol.11 No.-

Shampoo is one of important products to remove pollutants existing on hair and skin in our body, to maintain them sanitary, to make ourselves up. it has been classified such as perfume, 2in1, mild, treatm ent, and dandruff prevention according to consumer is trend varieties, out of the meaning just to cleanse They also have been changing about the kind of cosmetic Personal Care products that personal inclination leads. The transition for the needs by changing consumers propensity to consume is the natural result followed by the improvement of consumers income, education, and culture level. The domestic shampoo market is expected to grow, as it entered its maturity level in the 1990s as a turning point, to expand in quality rather than in quantity With the growth of highprice market from 1998, 20 is female consumers increase is leading global brand such as P&G and Unilever to grow up, meanwhile, domestic brands such as LG Household & Health Care, Pacific, and Aeakyung to get weakened in terms of competitiveness. This article is to suggest that the proper measurement among several to have strong brand competition is to strengthen the differentiation strategy of Brand Identity in terms of package design. The effective differentiation strategy of B.I means a systematic schematization in the business strategy level. B.I for local consumers and the realities of B.I application by domestic local brands that being traded in the domestic area is far beyond to the This article analyzes the existing state of B.I differentiations of products, which compete. This article analyzes the existing state of B.I differentiations of products, which competeaddition, this is to survey what has more competition and distinction base on B.I differentiation, and to propose the direction with the hope of elevating the competition level of local brands further.

주파수 선택성 레일리 페이딩 환경에서 부호화 기법을 이용한 직교 멀티캐리어 시스템의 오율 해석

정재필,박기식,한성운,조성준 한국항공대학교 1997 論文集 Vol.35 No.-

본 논문에서는 주파수 선택성 레일리 페이딩 환경에서 RS부호화, 컨벌루션 부호화, 연접부화를 이용하는 직교 멀티캐리어 BDPSK시스템과 QDPSK시스템의 오율특성을 구하였다. 오율특성은 정규화된 지연시간(??), 비트에너지 대 잡음전력 스펙트럼 밀도비(??), 희망 신호전력 대 지연되 비희망 신호전력비(D/U)를 파라미터로 하여 나타내었다. 검토한 결과, BDPSK 신호인 경우 D/U가 20[dB]일 대 오율을 ??으로 유지하기 위해 필요한 Eb/No는 Rs부호화, 컨벌루션 부호화 및 연접부호화에서느 각각 대략 20.8[dB], 16.0[dB], 14.5 [dB]가 필요하며, QDPSK신호인 경우 Rs부호화, 컨벌루션 부호화 및 연접부호화에서 각각 대략 24.0[dB], 18.9[dB], 13.5[dB]가 필요함을 알 수 있었다. This paper has evaluated the error performance of orthogonal multicarrier BDPSK and QDPSK systems which use Reed Solomon coding, convolutional coding, and concatenated coding technique in a frequency selective Rayleigh fading environment. The results show that when D/U (desired wave's power to undesired delayed wave's power ratio)=20dB at error rate of ??, Reed Solomeon coded BDPSK signal, convolutional coded BDPSK signal, and concatenated coded BDPSK signal need about 20.8[dB], 16.0[dB], 14.5[dB] respectively in terms of Eb/No, and Reed Solomon coded QDPSK signal, convolutional coded QDPSK signal, and concatenated coded QDPSK signal need about 24.0[dB], 18.9[dB], 13.5[dB] respectively.

ACP 실증에 따른 시설 주변 주민피폭선량 평가

김성영,정운관,윤인식,심재학 조선대학교 에너지.자원신기술연구소 2003 에너지·자원신기술연구소 논문지 Vol.25 No.2

The Advanced spent fuel Conditioning Process(ACP) is under development for the effective management of spent fuel which had been generated in nuclear plants. The ACP needs a hot cell where most operations will be performed. To give priority to the environment safety, radiation doses evaluation for the radioactive nuclides was preliminarily performed with the basic concept design report, the meteorological data and the recent site specific data. According to the production and release rate of nuclides, dose evaluations for residents around facility were performed. The evaluation result shows a safe margin for regulation limits and SAR limit of IMEF where this facility will be constructed.

Anisakis type I 幼蟲에 의한 人體感染 2例

손운목,고원규,설상영,정정명 인제대학교 1991 仁濟醫學 Vol.12 No.3

91년 5월 17일에 上腹部痛을 主訴로 本院을 내원한 2명의 患者에 대하여 胃 內視鏡檢査를 시행하였던 바, 胃 粘膜에 길이로 묻혀 있는 Anisakis 幼蟲을 1마리씩 檢出하였다. 胃 粘膜이 충체를 중심으로 肥厚되어 있었고 肉芽腫性 病巢가 형성되어 있었다. 검출된 충체는 둘다 Anisakis type I 幼蟲이었다. Two cases of gastric anisakiasis caused by Anisakis type I larva were reported. The patients, residing in Pusan, were 66-year-old male and 36-year-old female. They chiefly complained of epigastric pain and recalled they had eaten raw marine fish such as sea eel and bream. Two whitish round worms were found in the hypertrophic and granulomatous mucosa of stomach wall on gastroscopic examinations, and were classified as Anisakis type I larva.

영역분할과 투영기법을 이용한 내용기반 영상검색

金廷炫,金商雲 명지대학교 산업기술연구소 2005 産業技術硏究所論文集 Vol.24 No.-

This paper proposes a content based image retrieval system using a segmentation technique, where we employ the Watershed Segmentation and Horizontal/Vertical Projection Profile schemes to extract shape features. The proposed method has been tested and compared with a conventional retrieval method on both "animal pictures" and "character" image sets. Our experimental results demonstrate that the proposed mechanism retrieve the query image efficiently. The results especially demonstrate that the proposed method can be used to efficiently retrive animal objects from an image database.

CO₂고정을 위한 화학독립영양미생물 Aeromonas sp. strain JS-1의 분리 및 특성

배상옥,곽경오,이용운,김성준,정선용 전남대학교 촉매연구소 2000 觸媒硏究 論文集 Vol.21 No.-

The increase of CO2 in the atmosphere by fossil-fuel combustion has been recognized as a major cause of global warming. Thus many studies on CO2 removal from the combustion gas have been performed, and recently the techniques for biological CO2 fixation by photoautotrophs have also been developed, In this study, extensive screening was conducted to obtain micoorganism with high capability in fixing CO2, and its characteristics was investigated. As a result, a chemoautotrophs identified as a Aeromonas sp. strain JS-1 was isolated from the fresh water. The isolated strain used the molecular hydrogen and CO2 as an energy and a carbon source, respectively. Growth characteristics, which will be used in the development of a continuous culture system related in CO2 fixation, were examined in batch cultivation under conditions of various CO2 and NaCl concentrations, temperature, and pH. The results of the examination showed that the isolated strain had a good growth to high CO2 concentration(40%), indicating applicable in removing CO2 discharged from industries.

사용후핵연료 차세대관리공정 장비의 내방사선 요건 분석

김성영,송태길,윤지섭,정운관,여화연 조선대학교 에너지.자원신기술연구소 2003 에너지·자원신기술연구소 논문지 Vol.25 No.1

For hot operation of advanced spent fuel conditioning process(ACP), the analysis of radiation-resistant Requirements effect and the system design process are required to design equipment to operate to operate reliably in a gamma radiation environment such as hot cell. To analysis the effects of radiation for ACP, we used the SCALE codes which were certified by Nuclear Regulatory Commission(NRC). The source term was calculated which reflects the features of target nuclear fuels using ORIGEN-S, a module of the SCALE code, and the gamma dose rates were calculated by using the QADS modules, considering the geometry of process equipment respectively. the results are shows that the value was maximum 3.03 ㏉/h from the rod storage box in hot cell, maximum 0.6 ㏉/h from the metallizer, and maximum 72.0 ㏉/h from the vol-oxidizer. Considering those values, the design methods for shielding and repositioning the major equipments and components should be induced, and, the preventive maintenance for components before failure actually occurs should be minimized the effects of radiation.

시멘트 킬른 더스트를 사용한 콘크리트의 역학적 특성에 관한 연구

전충근,차천수,차완호,손성운,한천구 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

This paper is intended to investigate the properties of fresh and hardened concrete, in which cement and fine aggregate are replaced with cement kiln dust(CKD), for effective using method of CKD, a by-product produced in the process of making cement. According to the results, as the replacing ratio of CKD increases, slump and air content of concrete decreases remarkably due to an increase of viscosity and filling of the pores respectively. As the properties of setting, setting time are shortened with an increase of the replacing ratio of CKD. Compressive strength increases due to the filling effect of the pores in comparison with plain concrete, and compressive strength ratio is high at early age.