서울의 Penicillinase Producing Neisseria Gonorrhoeae 발생빈도(1994)

김재홍,안진균,정성재,김영태,김중환,김시영,이석종,이홍렬,서호석,김경훈,권혁진,정우권,고우석,이용석,안필수,오준규,오용섭 대한화학요법학회 1996 대한화학요법학회지 Vol.14 No.1

Background : In recent years gonorrhoea has been panendemic and remains one of the most common Sexually Transmitted Diseases in the world, especially in developing countries. Objective & Method : For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria Gonorrhoeae(PPNG), Ive have been trying to study the patients who have visited the VD Clinic of Choong-Ku Public Health Center in Seoul since 1980 by means of the chromogenic cephalosporin method. Results : In 1994, 168 strains of N. gonorrhoeae were isolated, among which 109 (64,9% ) were PPNG. Conclustion : Our results suggests that the prevalence of PPNG in Seoul is still increasing.

밀폐형 온실의 과습 조건과 무선통신 성능 관계 규명

김태균, 송정원, 박소정, 오종우 忠北大學校 農業科學硏究所 2017 農業科學硏究 Vol.33 No.1

In order to utilize the ubiquitous sensor network technology, it is necessary to identify the communication characteristics of the sensor node. The purpose of this study is to investigate the wireless performance to be related the environment (i.e. humidity) which can cause data loss in the greenhouse environment. The performance of wireless communication was conducted in the constant temperature and humidity device. The results of performance for Zigbee communication were not affected by the humidity. The Zigbee communication without the data loss would be more effective to control the environment in the greenhouse.

절삭가공오차보상을 위한 기상측정 데이터기반 신경회로망의 응용

서태일,박균명,조명우,윤길상 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-

This paper presents a methodology of machining error compensation by using Artificial Neural Network(ANN) model based on the inspection database of On-Machine -Measurement(OMM) system. First, the geometric errors of the machining center and the probing errors are significantly reduced through compensation processes. Then, we acquire machining error distributions from a specimen work piece. In order to efficiently analyze the machining errors, we define two characteristic machining error parameters. These can he modeled by using an ANN model, which allows us to determine the machining errors in the domain of considered cutting conditions. Based on this ANN model, we try to correct the tool path in order to effectively reduce the errors by using an iterative algorithm. The iterative algorithm allows us to integrate changes of the cutting conditions according to the corrected tool path. Experimentation is carried out in order to validate the approaches proposed in this paper.

유니사이클 로봇에 대한 인간적 추론 제어 메카니즘

김중완,안찬우,전태옥,전언찬,정희균 동아대학교 공과대학부설 생산기술연구소 1996 生産技術硏究所硏究論文集 Vol.1 No.2

Our unicycle has simple mechanical structure.But unicycle's dynamical system is a very sensitive unstable nonlinear system. equations of motion for a simple unicycle robot were derived using Lagrage's method. In this paper, a human fuzzy influence control mechanism was established throught an inquiry into human riding a unicycle, and we developed a hybrid controller to control our unicycle robot. This proposed hybrid controller is consisted with a pure PD and two fuzzy gain scheduled controllers and a direct fuzzy logic controller. Computer simulation results show that our hybrid controller has robust control performnance to unstable nnonlinear unicycle robot system.

Prazosin의 항고혈압 효과에 대한 임상적 관찰

서세웅,이균태,김연호,조성락,신영우,신영기 최신의학사 1984 最新醫學 Vol.27 No.8

기계시각을 이용한 강구 자동 검사장치

김윤수,박수우,임병훈,김태균,최병재,박철영,이문락,도용태 대구대학교 정보통신연구소 2008 情報通信硏究 Vol.5 No.1

Metal balls are commonly used in mechanical elements and systems including bearings. If there is a defect in a metal ball, it can cause a serious machine failure. By this reason every balls produced are required to be inspected, and the inspection is usually done by human eyes. However, the inspection by human eyes is always with the risk of mistakes, and a need to automate the inspection process is arisen. This paper describes a design of an automatic inspection system for detecting defects on ball surface. A machine vision system is used, and design process and techniques are described in detail. 강구는 베어링을 비롯한 기계 요소 및 장치에서 널리 사용되는 부품이다. 만약 강구에 결함이 있을 시, 이를 사용하는 기계에서 치명적인 결함이 초래될 수 있다. 따라서 제조된 강구에 대해서는 전량검사가 요구되고 있고, 검사과정은 사람의 육안에 의한 검사가 주를 이루고 있다. 그런데 사람에 의한 검사에는 항상 실수의 가능성이 있으므로, 이를 자동화하는 것이 필요하다. 본 논문에서는 강구의 표면 결함을 자동적으로 검사할 수 있는 장치를 설계한다. 기계시각 장치가 사용되었고, 설계에 따른 구체적 절차와 기술들이 서술된다.

중학교 화학 분야의 개념 연구에 대한 문제점 분석

朴恩姬,姜대勳,白盛惠,朴國泰,金惠敬,蔡禹기,權鈞 한국교원대학교 과학교육연구소 1999 청람과학교육연구논총 Vol.9 No.1

중학교 화학 분야의 오개념 조사에 사용된 설문지의 문제점을 밝혀, 학생들의 정확한 오개념 조사를 위한 바탕을 마련하고자 한다. 기존의 중학교 화학 분야에 대한 오개념 조사 설문지가 연구 대상 학생들에게 잘못 사용되고 있었으며, 문항 내용 자체에도 오류가 있었음을 지적하고자 하는 것이다. 선행 연구들의 분석 결과들이 오개념이 아니라 무개념임을 확인하기 위하여 중학교 1학년 학생 182명을 대상으로 두 종류의 설문지 A와 B를 투입하여 조사하였다. 설문지 A는 오개념 연구를 위해 선행 연구들에서 사용한 문항들로 이루어진 것으로, 이를 투입한 결과를 선행 연구들의 결과들과 비교하기 위한 것이다. 그리고 설문지 B는 설문지 A에서 응답한 학생들의 구체적인 생각을 알아보기 위하여 새롭게 개발한 것이다. 설문지 A를 통해 얻은 결과와 선행 연구들에서 얻은 결과들을 비교할 때, 전반적으로 일관성이 없게 나타났으며, 중학교 1학년 학생들의 주관식 정답률이 객관식 정답률에 비해 매우 낮게 나타나는 공통점은 있었으나, 문항 자체의 오류들이 발견되었다. 설문지 B를 통해 학생들의 생각을 알아본 결과, 설문지 A에서 과학적 개념과 오개념으로 분류된 학생들 중에서 무개념으로 판단된 경우가 많았다. This study was to clarify the problems of questionnaires related to misconception researches of middle school chemistry and to prepare a ground for the correct misconception research for students. For these purposes, the questionnaires of the misconception researches related to chemistry in middle school were analyzed, and the mistakes of the questions which were used in 7th grade students were found, based on a definition of misconceptions in this study. Also, the errors in contents of the questionnaires were indicated. The results of the analysis revealed that most of the 7th grade students did not have misconceptions contrary to some of the previous researches conclusions. They only had no conceptions related to the contents. In order to support this analysis, two different questionnaire sets (questionnaire set A and B) for 182 7th grade students were used. After obtaining similar results to those of the previous researches by the questionnaire set A, the students' thoughts were examined by the questionnaire set B. From the results of this study, the correct answer rates of subjective questions were very low compared with those of objective questions in the questionnaire set A for 7th grade students. It was hard to find consistency among the results of the researches using the questionnaire set A. And many contents of the questions consisted of the questionnaire set A were not consisted with a definition of misconceptions. There were errors in the contents of the questions, too. The students classified as the having-science-concepts group and the having-misconceptions group by the questionnaire set A were classified as the having-no-concepts group by the questionnaire set B.

자동 경계 탐지(Automated Border Detection)심초음파도를 이용한 좌심방 면적 및 기능의 평가

김현주,주승재,임진형,정효균,이영수,유호대,차태준,이재우 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.2

Molecular Taxonomic Analysis of the Korean Tettigonia Linnaeus (Orthoptera: Tettigoniidae: Tettigoniini)

Tae-Kyu Kim,Taeman Han,In Gyun Park,Seonghyun Kim,Tae-Woo Kim,Haechul Park 한국응용곤충학회 2015 한국응용곤충학회 학술대회논문집 Vol.2015 No.04

In our previous study with sequenced data from DNA barcoding region of Korean Tettigonia showed that the Jeju population of T. ussuriana (JJ-Tu) more closely related to T. dolichoptera than mainland population of T. ussuriana (ML-Tu) with low genetic distance (0.87-1.05%). In mitochondrial systematics for a eukaryotic organism including orthopteran insects, sequence data from a short mitochondrial DNA fragment should be trait with caution because nuclear mitochondrial pseudogenes (numts) can be unintentionally coamplified when we use universal primers based on a PCR method. In this study, we retried their sequence analysis to avoid coamplication of numts in sequences from cox1 and cox2 genes. and scrutinized each sequence. The molecular evidences (cox1, cox2, and nad1) for Korean species suggest that JJ-Tu is more closely related to T. dolichoptera (0.76-1.23% in cox1; 1.23-1.54% in cox2; 1.01-1.35% in nad1) than ML-Tu (3.77-4.59% in cox1; 3.61-4.76% in cox2; 2.03-3.25 in nad1). The genetic distance of sequence data from cox1 between JJ-Tu and ML-Tu satisfied a requirement for species-distinction by comparing genetic distance between Tettigonia species. Moreover, JJ-Tu is a geographic population of Tettigonia with different morphological traits that is supported with formed a cluster. Although JJ-Tu closely related to T. dolichoptera with low genetic distance, we will determine its taxonomic status through integrative taxonomic study.

Oxidation inhibition of poly(3-hexylthiophene-2,5-diyl) in the bulk heterojunction by an electron acceptor

Woo, Tae Gyun,Cha, Byeong Jun,Seo, Hyun Ook,Kim, Young Dok Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.458 No.-

<P><B>Abstract</B></P> <P>Poly(3-hexylthiophene-2,5-diyl) (P3HT) is an organic semiconducting polymer that is widely used in organic electronic devices such as organic solar cells. In this work, we studied the oxidation behavior of P3HT on glass under exposure to visible light and dry air. We also compared the oxidation behavior of bare P3HT films with that of P3HT/phenyl-C<SUB>61</SUB>-butyric acid methyl ester (PCBM) bulk heterojunction systems consisting of donor and acceptor. UV–Vis absorption spectroscopy and X-ray photoelectron spectroscopy were employed to provide evidence that optically excited P3HT could undergo oxidation, which was likely initiated via electron transfer from the conduction band of P3HT to O<SUB>2</SUB>, forming strongly oxidizing O<SUB>2</SUB> <SUP>–</SUP> species. By contrast, P3HT + PCBM yielded almost no oxidation of organic materials under the same conditions. PCBM was thus suggested to extract optically excited electrons from P3HT, thereby inhibiting the formation of O<SUB>2</SUB> <SUP>–</SUP>. PCBM thus played a role in separating electron-hole pairs from the photoactive layers of organic solar cells and affected the passivating oxidation of photoactive conjugate polymers.</P> <P><B>Highlights</B></P> <P> <UL> <LI> P3HT, a semiconductive polymer, is easily oxidized by visible light under air. </LI> <LI> Oxidizing agent of P3HT is O<SUB>2</SUB> <SUP>–</SUP> formed by electron transfer from P3HT to O<SUB>2</SUB>. </LI> <LI> PC<SUB>61</SUB>BM, an electron acceptor, passivates oxidation of P3HT. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>