서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)

김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1

In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(PPNG), we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 64.5% in 1998.

유해화학물질의 계통분석

박성우,박유신,이진훈,유재훈,김유나,오세진,이진숙,김남이,박종신,남금문,노동석 內務部 國立科學搜査硏究所 2002 國立 科學 搜査 硏究所 年報 Vol.34 No.-

간접 복합레진 합착 시 자가부식형과 자가접착형 레진시멘트의 상아질에 대한 미세인장 결합강도

박재구,조영곤,김일신 大韓齒科保存學會 2010 Restorative Dentistry & Endodontics Vol.35 No.2

본 연구는 간접 복합레진 수복물을 1종의 자가부식형 레진시멘트와 3종의 자가접착형 레진시멘트를 이용하여 상아질에 합착하였을 때 각 레진시멘트의 미세인장 결합강도와 결합계면의 차이를 평가하기 위하여 시행하였다. 발거된 상.하악 대구치 교합면 측 상아질에 Tescera 복합레진 블록을 레진시멘트(PA 군: Panavia F 2.0, RE 군: RelyX Unicem Clicker, MA 군: Maxem, BI 군: BisCem)를 이용하여 합착하였다. 증류수에 24시간 동안 보관한 후, 합착된 면의 단면적이 1.0 × 1.0 mm인 막대모양의 시편을 제작하여 각 시편에 분당 0.5 mm의 crosshead speed로 인장하중을 가하였다. 각 군의 미세인장 결합강도는 one-way ANOVA와 Tukey의 HSD 방법을 이용하여 비교하였다. FE-SEM 하에서 모든 파절편의 상아질 쪽 파절양상과 레진시멘트-상아질 및 레진시멘트-복합레진의 계면을 관찰하였다. 본 연구의 결과 간접 복합레진 블록을 레진시멘트로 상아질에 합착할 때 PA 군과 RE 군은 MA 군과 BI 군보다 높은 결합강도와 긴밀한 접착 및 레진테그가 관찰되었고, 복합레진과 레진시멘트 간에는 간극이 관찰되었다. The purpose of this study was to evaluate the microtensile bond strength (μTBS), failure modes and bonding interfaces of self-etching and three self-adhesive resin cements to dentin and indirect composite resin. Cylindrical composite blocks (Tescera, Bisco Inc.) were luted with resin cements (PA: Panavia F 2.0, Kuraray Medical Inc., RE: RelyX Unicem Clicker, 3M ESPE., MA: Maxem, Kerr Co., BI: BisCem, Bisco Inc.) on the prepared occlusal dentin surfaces of 20 extracted molars. After storage in distilled water for 24h, 1.0 mm × 1.0 mm composite-dentin beams were prepared. μTBS was tested at a cross-head speed of 0.5 mm/min. Data were analyzed with one-way ANOVA and Tukey’s HSD test. Dentin sides of all fractured specimens and interfaces of resin cements-dentin or resin cements-composite were examined at FESEM(Field Emission-Scanning Electron Microscope). In conclusion, PA and RE showed higher bond strength and closer adaptation than MA and BI when indirect composite blocks were luted to dentin using a self-etching and three self-adhesive resin cements.

작동음의 분석을 이용한 펌프의 고장진단

박순재,이신영 한국공작기계학회 2003 한국생산제조학회지 Vol.12 No.6

We should maintain the maximum operation capacity for production facilities and find properly out the fault of each equipment rapidly in order to decrease a loss caused by its failure. The acoustic signals of a machine always carry the dynamic information of the machine. These signal are very useful for the feature extraction and fault diagnosis. We performed a fundamental study which develops a system of fault diagnosis for a pump. We obtained noises by a microphone, analysed and compared the signals converted to frequency range for normal products, artificially deformed products. We tried to search a change of noise signals according to machine malfunctions and analyse the type of deformation or failure. The results showed that acoustic signals as well as vibration signals can be used as a simple method for a detection of machine malfunction or fault diagnosis.

유해화학물질의 계통분석

박성우,박유신,이진훈,김남이,김유나,임미애,이상기,유재훈,진광호,신호상,노동석 內務部 國立科學搜査硏究所 2001 國立 科學 搜査 硏究所 年報 Vol.33 No.-

고속 퓨리에 변환을 이용한 지문의 분류

박신재,이정문,권용호 江原大學校 産業技術硏究所 1998 産業技術硏究 Vol.18 No.-

Classification of fingerprints is one of the major subjects on which many researchers have been studying for efficient identification, But fingerprints should be preprocessed in various ways prior to being classified. Factors such as the accuracy and the processing time should be considered in classified. Factors such as the accuracy and the processing time should be considered in classification of fingerprints. In this paper, we propose a method for classifying fingerprints into several frequent patterns. This method consists of two stages. A fingerprint image is first converted to a skeleton form to find out the center. Then it is identified as a member of one of preclassified pattern by the frequency domain feature. Experiments show that the proposed method is quite useful in classifying fingerprints into typical patterns

작동음의 분석을 이용한 펌프의 고장진단

박순재,이신영 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-

We should maintain the maximum operation capacity for production facilities and find properly out the fault of each equipment rapidly in order to decrease a loss caused by its failure. The acoustic signals of a machine always carry the dynamic information of the machine. These signals are very useful for the feature extraction and fault diagnosis. We performed a fundamental study which develops a system of fault diagnosis for a pump. We obtained noises by a microphone, analysed and compared the signals converted to frequency range for normal products, artificially deformed products. We tried to search a change of noise signals according to machine malfunctions and analyse the type of deformation or failure. The results showed that acoustic signals as well as vibration signals can be used as a simple method for a detection of machine malfunction or fault diagnosis.

기니픽에서 Salicylate에 의한 유발이음향방사의 변화

박찬일,장재웅,신광철,이오영 충남대학교 의과대학 지역사회의학연구소 1999 충남의대잡지 Vol.26 No.2

A Reversible hearing loss and tinnitus have been known resulting from large doses or longterm use of salicylate. The exact cause of salicylate ototoxicity is unknown. Cochlear electrophysiology and otoacoustic emission studies suggest that the drug may interfere with outer hair cell clectromotility. The changes in transiently evoked otoacoustic emission(TEOAEs) were observed in guinea pigs after the intramuscular injection of salicylate(150, 300, 450 mg/kg). TEOAEs decreased slowly after the injection salicylate in a dose-dependent manner. Absence of echo response was detected 3 hours after the injection of 300mg/kg in 2 of 5 guinea pigs, 2 hours after the injection of 450mg/kg in 3 of 6 guinea pigs, 3 hours after the injection of 450mg/ kg in 3 of 6 guinea pigs. Echo response returned to control level in 6 hours after injection of 300mg/kg, in 7 hours after infection of 450 mg/kg. Findings support that salicylate affect electromotility of outer hair cells.

안정화제 처리된 회수수를 사용한 콘크리트의 특성에 관한 실험적 연구

박영신,박재명,이세현,이문환 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)

Recently, Most enterprises produced ready mixed concrete uses a mixing water as a recycling water without a density control in proportion to guide and standard. That is a cause of deterioration in the concrete quality like a reduce of strength, laitance, crack, etc. This study shows basic materials for development of ready mixed concrete recycling water density control system that holds down a deterioration in the concrete quality by using a mixed water treated recycling water with stabilizing agent and examines a possibility of re-using components of cement in recycling water. Therefore, in the experiment, we make a recycling water contains 3,5,7% of solid content ratio examines a property of a mixing water with a stabilizing agent and without it. Results of this study is next as follow. 1. The slump is decreased 1~2cm in a mixing without a stabilizing agent and the mixing with a stabilizing agent is similar to the standard mixing. 2. The air content is 4~4.7% in proportion to an increase of solid content without a stabilizing agent and the mixing with a stabilizing agent is similar to the standard mixing. 3. The compressive strength of an early curing age is tendency to increase both the mixing without a stabilizing agent and the mixing with a stabilizing agent. But, After 14days is passed, Compressive strength is decreased in a mixing without a stabilizing agent but increased a mixing with a stabilizing agent.

펌프의 작동음 주파수 분석에 의한 진단

이신영,박순재 한국공작기계학회 2003 한국공작기계학회 추계학술대회논문집 Vol.2003 No.-

A fundamental study for developing a system of fault diagnosis of a pump is performed by using neural network. The acoustic signals were obtained and converted to frequency domain for normal products and artificially deformed products. The signals were obtained in various driving frequencies in order to obtain many types of data from a limited number of pumps. The acoustic data in frequency domain were managed to multiples of real driving frequency with the aim of easy comparison. The neural network model used in this study was 3-layer type composed of input, hidden, and output layer. The normalized amplitudes at the multiples of real driving frequency were chosen as units of input layer. Various sets of teach signals made from original data by eliminating some random cases were used in the training. The average errors were approximately proportional to the number of untaught data. The results showed neural network trained by acoustic signals can be used as a simple method for a detection of machine malfunction or fault diagnosis.