전자상거래에 데이터마이닝 기술 적용

김종완,진승훈,김병익,김태균,김영순 대구대학교 과학기술연구소 2001 科學技術硏究 Vol.8 No.1

The definition of data mining is the non-trivial extraction of implicit, previously unknown and potentially useful knowledge from data. Also, data mining has been worked on various fields such as database, machine learning, statistics, expert systems, and data visualization, and is a process consisting of these techniques. In many E-Commerce applications, it is important to build personalized profiles of individual users from their transaction histories. These profile constitute models of individual user behavior and can be specified with sets of rules learned from user transactional histories using various data mining techniques. In this paper, we present a MAS (multi-agent system) for customer management which maintains personal user information automatically, commands retrieval of products according to user preference, and builds personalized profiles of user.

Lidocaine, Thrombin, Epinephrine 의 항균효과

김진우,이동건,전혜선,김승준,김석찬,안중현,김치홍,권순석,김영균,김관형,문화식,신완식,송정섭,박성학 대한감염학회 2005 감염과 화학요법 Vol.37 No.6

목적 : 기관지내시경 검사에서 흔히 사용되는 국소마취제인 lidocaine과 내시경시 지혈목적으로 사용되는 thrombin과 epinephrine이 각종 균주에 미치는 항균효과에 대해 알아보고자 하였다. 재료 및 방법 : 균주는 가톨릭대학교 성모병원에서 2004년 3월부터 2004년 9월까지 임상검체 에서 동정된 S. aureus, S. pneumoniae, K. pneumoniae, P. aeruginosa 각각 42, 42, 42, 43주를 대상으로 하였다. Lidocaine, thrombin, epinephrine 감수성 검사는 National Committee for Clinical Laboratory Standards (NCCLS, 2002)의 기준에 따랐다. 결과 : Lidocaine은 S. aureus, S. pneumoniae, P. aeruginosa에서 MIC_(50), MIC_(90) 모두 20,000 ㎍/mL 이었다. K. pneumoniae는 각각 10,000 ㎍/mL이었다. Thrombin은 S. aureus와 P. aeruginosa에서 MIC50 500 lU/mL 과 MIC_(90) 500 IU/mL 이상이었고, K. pneumoniae에서는 MIC_(50)과 MIC_(90)이 모두 500 lU/mL이상이었으나 S. pneumoniae에서는 MIC_(50)과 MIC_(90)은 125 IU/mL이었다. Epinephrine은 K. pneumoniae, S. pneumoniae에 대한 MIC_(50), MIC_(90)가 모두 >500 ㎍/mL이었고, S. aureus와 P. aeruginosa에 대한 MIC_(50), MIC_(90)가 모두 500 ㎍/mL이었다. 결론 : 기관지 내시경 검사에서 흔히 쓰이는 lidocaine, thrombin, epinephrine 등의 약제들이 호흡기 질환의 흔한 병원균인 S. aureus, S. pneumoniae, K. pneumoniae, P. aeruginosa 균주들에 대해 항균 효과가 있을 수 있어 세균배양검사에 영향을 미칠 수 있겠다. Background : We performed this stody to find out about antimicrobial effect of lidocaine which is commonly used local anesthetic, and thrombin and epinephrine used for hemostasis during bronchoscopic procedures. Materials and Methods : The microorganisms that were cultured from specimens obtained during bronchoscopy were Staphylococcus aureus (n=42), Streptococcus pneumoniae (n=42), Klebsiella pneumoniae (n=42), and Pseudomonas aeruginosa (n=43) collected from St. Mary's Hospital, from March to Sep 2004 were used for susceptibity testing. Susceptibility to lidocaine, thrombin, and epinephrine were tested according to the National Committee for Clinical Laboratory Standards. Result : MIC_(50) and MIC_(90) of lidocaine for S. aureus, S. pneumoniae, P. aeruginosa were all 20,000 ㎍/mL and that for K. pneumoniae were 10,000 ㎍/mL. MIC_(50) and MIC_(90) of thrombin for both S. aureus and P. aeruginosa was 500 IU/mL and above 500 IU/mL, respectively; that for K. pneumoniae were all above 500 IU/mL and for S. pneumoniae they were 125 IU/mL, MIC_(50) and MIC_(90) of epinephrine for K. pneumoniae and S. pneumoniae were above 500 ㎍/mL; that for S. aureus and P. aeruginosa were 500 ㎍/mL. Conclusion : We observed possible antimicrobial effect of lidocaine, thrombin, and epinephrine in vitro against pathogens such as S. aureus, S. pneumoniae, K. pneumoniae, P. aeruginosa, which are common respiratory microorganisms. The use of these agants could affect the result of bacterial culture.

흰쥐의 원위콩팥단위내 칼슘결합단백질 (calbindin-D28k)에 관한 면역세포화학적 연구

김영희,김완영,김인범,한승호,오수자,차정호,김진 대한해부학회 1997 Anatomy & Cell Biology Vol.30 No.6

내시경적 점막절제술로 치험한 식도 과립상 세포종 1례

강혁주,김성욱,최석진,이중현,장재식,서영범,윤병구,박건욱,김성자,김용섭,강승완,이구,양창헌,이창우,김욱년,이광헌,서정일 동국대학교 의학연구소 2000 東國醫學 Vol.7 No.-

과립상 세포종은 Schwann 세포 기원으로 생각되며 인체에 비교적 드물게 발생한다. 과립상 세포종은 전신 어느 곳에서나 발견될 수 있으나 주로 혀, 구강, 피부 혹은 유방 등에서 호발하며 드물게 위장관에서 발견된다. 위장관에서는 식도에서 가장 호발하며 다음으로 위, 대장 순이다. 과립상 세포종은 대부분, 특히 위장관에서는 양성이며 소수의 악성 병변이 보고되었다. 이러한 이유와 함께 수술 전의 진단이 어렵기 때문에 과립상 세포종에 대한 근본적인 치료는 현재까지 외과적 절제술이다. 최근에 시도되는 치료방법들로는 내시경적 레이저 치료, 용종절제술, 내시경적 점막 절제술 등이 있다. 저자들은 상부 소화관 내시경검사를 시행하여 식도 과립상 세포종을 진단하고 내시경적 점막 절제술을 시행하여 합병증 없이 퇴원하여 현재 재발없이 경과 관찰중인 1례를 경험하였기에 보고하는 바이다. Granular cell tumors, which occur infrequently, are probably of Schwann cell origin. They can occur almost anywhere in the body but usually affect the tongue, oral cavity, skin, or breasts and are rarely found in the gastrointestinal tracts. The esophagus is the most frequent gastrointestinal site, followed by the stomach and the colon. Granular cell tumors are generally benign, especially in the gastrointestinal tract, some malignant lesions have been reported. For this reason, and also because preoperative diagnosis is difficult, the standard treatment for granular cell tumor has until now been surgical excision. In recent years, other therapeutic methods is endoscopic laser therapy (ELT), polypectiomy, endoscopic mucosal resection (EMR). We report a case of esophageal granular cell tumor which was diagnosed by an endoscopy and managed using an endoscopic mucosal resection without complication.

TFELD 절연층을 위해 ITO glass위에 증착된 (Ba_(0.5),Sr_(0.5))TiO₃박막의 특성

김정환,배승춘,권성렬,정훈,박진우,김기완 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1

We have studied that dielectric and electrical properties of (Ba_(0.5),Sr_(0.5))TiO_(3) thin films deposited on Indium Tin Oxide-coated glass substrate by using rf-magnetron sputtering method in this paper. Substrates were heated at room, 300℃ , 400℃, and 500℃. Working pressure was changed 5mTorr, 10mTorr, 20mTorr, 30mTorr respectively substrates temperature, and Ar:O_(2), ratio was fixed 9:1. SEM analysis was conducted to investigate thickness of BST thin films. Dielectric constant, current-voltage(I-V), and transmittance were measured. We observed difference of that thickness, dielectric constant, current-voltage(I-V), and transmittance due to variable substrates temperature and working pressure. We also obtained best conditions at 400℃, 30mTorr. Dielectric constant was 209.1 at 1kHz, leakage current density was below 7.35X10^(-7)A/cm^(2) at 100V, and transmittance was over 91%.

SVM을 기반으로 한 심음 기반의 심장 질환 판별에 관한 연구

金寶利,白承和,金東完 明知大學校 産業技術硏究所 2007 産業技術硏究所論文集 Vol.26 No.-

In this paper, Support Vector Machine Algorithms were used with promising results in various critical problems, concerning heart sound classification. In general this classification problem can be divided in many sub problems, each one dealing either with one morphological characteristic of the heart sound or with difficult to distinguish heart diseases. We proposed a ventricular fibrillation detection algorithm based on support vector machine classifier and Short Time Vector Machine, which could offer benefits to reduce the learning costs as well as good classification performance. It showed similar or higher values. Consequently, we could find that the proposed input features and SVM classifier would one of the most useful algorithm for cardiac disorder detection.

PASS (polyamic acid alkylamine salts) LB막의 이미드화 과정에 대한 연구

김태완,이승엽 弘益大學校 科學技術硏究所 1995 科學技術硏究論文集 Vol.6 No.-

We have aimed at the imidization condition of the polyamic acid alkylamine salts(PAAS) LB films to make the well-known polyimide LB films. The PAAS molecule, which is composed of pyromellitic dianhydride(PMDA) and oxydianiline(ODA), is a precursor of the polymide. To obtain the optimum conditions of film deposition, the π-A isotherms were examined by varying temperature, barrier moving speed, dipping speed, spreading amount of solution, and etc. The Z-type LB films were made at the surface pressure of 5mN/m and 25mN/m for the AFM study: the former surface pressure forms the gas phase and the latter one forms the solid phase. Surface morphology of the LB films made at the solid phase(2Å Surface roughness) is more smooth than that of the LB films made at the gas phase(70Å Surface roughness). The imidization was performed by thermal treatment for 1 hour at 300℃. This condition was judged by TGA and DSC analysis. Current-voltage characteristics were measured along the perpendicular direction of the LB films at room temperature. Ohmic conduction has been observed below ∼10?V/cm and the calculated electrical conductivity is about 10-13S/cm. Nonohmic conduction has been observed above ∼10?V/cm and the conduction mechanism is able to be explained by the Schottky effect.

백금 담지 카본블랙 촉매 제조 및 활성조사

김종범,이무성,이완진,양갑승,서곤,김종호 全南大學校 觸媒硏究所 2002 觸媒硏究 論文集 Vol.23 No.-

Platinum catalysts supported on carbon were prepared by using various method. The particle size distribution of loaded platinum was examined using transmission electron microscope, and that was discussed relatively to the oxidation treatment of carbon black and loading method of platinum. In addition, the relationship between its particle size distribution and catalytic activities in the deep oxidation reaction of carbon monoxide and the reduction removal of dissolved oxygen by hydrazine. The number of functional groups on carbon black largely increased by the oxidation treatment with nitric acid compared to that with air or hydrogen peroxide. The large number of functional groups were effective for homogeneous loading of platium, dispersing highly homogeneous platinum particles of 2∼3 nm in a diameter by the methanol reduction method. On the other hand, a large amount of platinum could be loaded on carbon balck using an impregnation method, but the particle size distribution of platinum was poor in homogeneity. Platinum could be dispersed with extremely small particles using on ion exchange method, but the loading amount of platinum was very small. The activities of Pt/VX catalysts in the oxidation reaction of carbon monoxide and the redution of dissolved oxygen strongly varied with the number of platinum atoms exposed, regardless of the particle size, indicating that the highest catalytic activity was obtained on the Pt/VX catalyst prepared using the methanol reduction method due to the high dispersion and large loading of platinum.

화학 및 마이크로파 고정에 의한 흰쥐 혀의 조직화학적 특징

김완종,신길상,이승임 순천향대학교 기초과학연구소 1995 순천향자연과학연구 논문집 Vol.1 No.1

The rat tongue tissues were fixed with chemical and microwave to compare the staining characteristics in different cases. The used microwave oven was equipped with infrared temperature sensor which developed in this laboratory and the control groups(chemical fixation) are treated with 3.5% neutral formalin. The microwave fixation is effective far above average in comparison with the chemical fixation. The optimal temperature measured by chromium - nickel thermocouple was 27±2℃ in physiological saline solution and therefore, this temperature was used for routine histological and histochemical works. It is to say in this work that the microwave fixation methods reveal more distinct histochemical reaction and save the fixative duration. The various preparations applied to minimize the preparation time. such as the freezing-section.

생물전극 반응조를 이용한 영양물질 제거

김성완,윤철종,최성우,김성우,우성훈,신남철,박승조 동아대학교 환경문제연구소 1999 硏究報告 Vol.22 No.2

We have investigated a performance of bio-electrode reactor for removal of nutrient like a nitrogen, phosphorus and organic substrate. Lab scale of bio-electrode reactor was operated with synthetic and tannery wastewater. Iron bar and stainless steel used for anode and cathode respectively. In experiment with synthetic wastewater, we were able to obtain the optimal current density range of 2.4-40 mA/dm² after 48 hrs operating time. And in that experiment, about 70~73% of ammonia nitrogen and 54~64% of phosphorus were removed. In experiment with tannery wastewater at 2.4-4.0 mA/dm², the removal rate of ammonia nitrogen, phosphorus and organic substract were about 62-69%, 45~59% and beyond 79% respectively.