반도체식 가스센서와 퍼지 ART를 이용한 혼합가스의 농도 추정

이정헌,조정환,전기준 대한전자공학회 2006 電子工學會論文誌-SC (System and control) Vol.43 No.4

A fuzzy ARTMAP neural network and a fuzzy ART neural network are proposed to identify H2S, NH3, and their mixtures and to estimate their concentrations, respectively. Features are extracted from a tin oxide gas sensor operated in a thermal modulation plan. After dimensions of the features are reduced by a preprocessing scheme, the features are fed into the proposed fuzzy neural networks. By computer simulations, the proposed method is shown to be fast in learning and stable in concentration estimating compared with other methods. 본 논문에서는 혼합가스의 종류를 구분하고 농도를 추정하기 위하여 퍼지 ARTMAP 신경회로망과 퍼지 ART 신경회로망을 각각 사용하였다. 온도변환 구동방식의 반도체식 가스센서를 이용하여 NH3, H2S, 그리고 그들의 혼합가스에 대해서 데이터를 획득하였고, 데이터들을 제안한 패턴인식방법의 입력으로 사용하기위해서 전 처리 과정을 통해 데이터들의 차원을 줄여주었다. 실험을 통해서 본 논문에서 사용한 방법이 이전의 다른 방법들과 비교하여 학습시간을 줄이면서 좀더 안정된 농도 추정 성능을 보여줌을 확인하였다.

영상이해환경을 위한 자료 구조의 분석 및 개선 방향에 관한 연구 ( The study of analysis and improvement of data structure for Image Understanding Environment )

이정헌,채옥삼 대한전자공학회 1997 대한전자공학회 학술대회 Vol.1997 No.1

효율적인 영상처리 교육을 위한 통합 환경 개발에 관한 연구

이정헌,채옥삼,안용학 대한전자공학회 2004 電子工學會論文誌-SP (Signal processing) Vol.41 No.06

With the wide-spread use of multimedia technology, the demand for the image processing engineer is increasing in various fields. But there are few engineers who can develop practical applications in the image processing area. To teach practical image processing techniques, we need an integrated education environment which can efficiently present the image processing theory and, at the same time, provide interactive experiments for the theory presented. In this paper, we propose an integrated education environment for the image processing, which is called MTES. It consists of the theory presentation systems and the experiment systems. The theory presentation systems support multimedia data, web document and Microsoft PowerpointTM file. It is tightly integrated with the experiment systems which are developed based on the integrated image processing algorithm development system, called Hello-Vision. 멀티미디어 기술의 광범위한 보급으로 여러 분야에서 영상처리 기술 인력에 대한 수요가 증가하고 있으나, 실무능력을 가진 전문 인력의 수는 시장의 요구에 비해 매우 적다. 영상처리 분야에 실무능력을 갖춘 전문 인력을 양성하기 위해서는 이론교육과정과 함께 학습한 이론을 실제 영상자료에 적용하고 적용된 결과를 분석해 볼 수 있는 실습과정을 체계적으로 지원할 수 있는 통합된 교육 환경이 필요하다. 본 논문에서는 효율적인 영상처리 교육이 이루어지도록 이론적인 내용과 이론에 따른 다양한 해법을 직접 체험해 볼 수 있고 학습과정에서 얻어진 새로운 아이디어를 쉽게 구현해 볼 수 있는 통합 환경인 MTES (Multimedia Technology Education System)를 제안한다. MTES는 영상처리 개발 환경인 Hello-Vision을 시뮬레이션 환경으로 사용할 수 있도록 수정하였으며, 이론교육환경과 이론과 실습이 체계적으로 이루어지도록 제어하는 제어관리자를 개발하여 효과적인 영상처리 교육 환경이 되도록 개발하였다.

감사위원회의 전문성이 회계투명성에 미치는 영향

이정헌,박성원,인창열 한국정부회계학회 2020 정부회계연구 Vol.18 No.3

본 연구의 목적은 회계투명성 제고 및 지배구조 개선을 위해 도입된 감사위원회가 실제로 회계투명 성을 향상시키는지 실증분석을 통해 규명하는데 있다. 이를 위해 감사위원회 설치와 감사위원회의 회 계・재무 전문성이 회계투명성을 향상시키는지 살펴보았다. 그리고 회계・재무 전문가 유형에 따라 회 계・재무 전문성이 회계투명성에 미치는 영향이 차이를 가지는지 살펴보았다. 분석결과 첫째, 감사위원회를 설치할 경우 회계투명성이 증가하는 것으로 나타났다. 지배구조 개선과 회계투명성 향상을 위해 도입된 감사위원회가 실효성을 가짐을 시사한다. 둘째, 감사위원회 내 회계・재무 전문가 비중이 높을수록 회계투명성이 증가하는 것으로 나타났다. 감사위원회의 회계・재무전문성이 높아 질수록 감사위원회가 효과적으로 작용함을 알 수 있다. 셋째, 회계・재무 전문가 4가지 유형 중 2)회계・재 무분야 석사학위 이상 취득자와 4)금융회사・정부 등 회계・재무 경력자 유형이 감사위원회에 포함되어 있 을 경우 회계투명성이 향상되며, 2)회계・재무분야 석사학위 이상 취득자는 4)금융회사・정부 등 회계・재 무 경력자보다 회계투명성 향상에 더 큰 영향을 미치는 것으로 나타났다. 감사위원의 회계・재무 전문가 유형에 따라 감사위원회의 회계・재무 전문성이 회계투명성에 미치는 영향이 상이함을 알 수 있다. 본 연구는 재무보고 품질을 종합적으로 아우르는 회계투명성 지수를 사용하여 감사위원회의 효과를 분석하였다는데 의의가 있다. 기업의 회계투명성을 전체적으로, 객관적으로 측정한 회계투명성 지수를 분석에 사용하여 감사위원회의 효과를 종합적으로 검증하였다. 그리고 감사위원회의 회계・재무 전문 가 유형에 따라 회계투명성에 미치는 영향이 상이함을 규명하였다는데 의의가 있다. 이는 정책입안자 와 기업 관계자에게 참고가 될 수 있을 것으로 기대된다. The purpose of this study is to conduct an empirical analysis to examine whether the Audit Committee, which was introduced to improve accounting transparency and corporate governance, actually improves accounting transparency. To this end, we examined whether the establishment of the Audit Committee and its accounting and financial expertise improve accounting transparency. In addition, we examined whether the influence of accounting/ financial expertise on accounting transparency differs based on the type of accounting/financial expert. The analysis results showed that first, accounting transparency increased when an audit committee was established. This implies that the Audit Committee, which was introduced to improve governance structure and accounting transparency, is effective. Second, accounting transparency increased with an increase in the proportion of accounting and financial experts in the Audit Committee. The Audit Committee works more effectively as its accounting and financial expertise increases. Third, Accounting transparency improves when a master's degree or higher in accounting and finance and those with accounting and finance experience, such as a financial company or the government is included in the Audit Committee. In addition, those with a master's degree or higher in accounting and finance have a greater impact on improving accounting transparency than those with experience in accounting and finance, such as those from financial companies or the government. The effect of the accounting transparency of the Audit Committee depends on its type of accounting/financial expertise. The contributions of this study are as follows. First, the effect of the audit committee was analyzed using the accounting transparency index that comprehensively encompasses the quality of financial reporting. Second, it was found that the impact on accounting transparency differs depending on the types of accounting and finance experts in the Audit Committee. This is expected to serve as a reference for policy makers and business people.

Methotrexate의 심근독성에 대한 율草의 효과

이정헌,이강창,하대호,손일홍,이환봉,오연균,최대호,김원신,박승택,전병훈 한의병리학회 2001 동의생리병리학회지 Vol.15 No.4

고려인삼(Panax ginseng C.A. Meyer) Ribulose-1,5-bisphosphate Carboxylase/oxygenase Large Subunit(rbct) Gene의 Cloning

이정헌,임용표 고려인삼학회 1995 Journal of Ginseng Research Vol.19 No.1

The DNA fragment containing ginseng ribulose-1,5-bisphosphate carboxytase/oxygenase large subunit(rbcL) gene was cloned from the ginseng chloroplast EcoRl library by colony lift hybridization with tobacco rbcL gene probe. From the screened clone, the DNA fragment containing ginseng rbcL gene was digested with several restriction enzyme and analyzed by Southern blot hybridization for the construction of restriction map. The ginseng rbcL gene fragment was subcloned in pBluescript II SK + vector and sequence analysis was performed. The nucleotide sequence of ginseng rbcL gene was compared with those of petunia, tobacco, alfalfa, rice and barley, which showed a homology of 93.1%, 95.2%, 90.5%, 85.5% and 84.3%, respectively.

이빨에 의한 한우 연령 감정법

이정헌 한국종축개량협회 2000 한우개량 Vol.2000 No.2

Burley 21 담배에서 Putrescine N-Methyltransferase 유전자의 클로닝

이정헌,김선원,류명현,박성원 한국연초학회 2003 한국연초학회지 Vol.25 No.2

Recently, many researches for plant alkaloids, one of the largest groups of natural products, are reported because of their various pharmacological activity. This study was carried out to clone putrescine N-methyltransferase (PMT) gene which is a key enzyme in diverting polyamine metabolism towards the biosynthesis of nicotine and related alkaloids from Burley tobacco. To induce expression of PMT gene in tobacco plant, the floral meristem was removed and then mRNA was purified from root. cDNA encoding PMT gene was isolated by RT PCR and cloned. Three different groups of clones were screened by PCR and restriction enzyme digestion analysis and were characterized. The data of these screening revealed that three types of PMT are present in Burley tobacco. Comparison of the nucleotide sequence of this three genes encoding putative PMT with those of other tobaccos revealed that two types of PMT are newly discovered from Nicotiana tabacum cv. Br21 tobacco and they were same as PMT2, PMT3 of N. tabacum cv. Xanthi.

음악축제의 팬덤 기반 프로그래밍에 관한 소고

이정헌 水原大學校 2019 論文集 Vol.33 No.-

This paper developed the brief ideas for the programs of the music festivals in korea in order to satisfy the fandom. Ideas were developed into seven programs. First, home stay program which accommodates the artists at the fans house during their visit. Second, camping together program which allows fans to camp with their beloved artists. Third, let’s B.B.Q. party by which fans participate the party with the artists for B.B.Q. Fourth, auction for dinning together which let fans to have a chance to eat dinner or lunch with their artists by auctioning. Fifth, draw my artist program in which fans can draw their artists, then artists choose best ones. Sixth, sing along program in which fans and artists enjoy karaoke together. Seventh, the master class by the artists program in which the artists teach fans who interested in learning skills of playing musical instrument or singing.

삼투충격에 대한 진균의 반응

이정헌,맹필재 충남대학교 생물공학연구소 2003 생물공학연구지 Vol.9 No.1

On exposure to the harmful environmental stress, all living cells display a rapid molecular response which is commonly designated stress response. In this report, we are describe the mechanism of osmostress response mainly in fungi, including accumulation of compatible solutes, such as glycerol and trehalose, and the enzymes involved in the biosynthetic process of the osmolytes, such as glycerol-P dehydrogenase, dihydroxyacetone kinase, trehalose-6-P synthase, and trehalose-6-P phosphatase. We also describe the genes for the enzymes for osmolyte synthesis and transport, such as GPD1, GPD2, PTS1, PTS2, GUT1, HAL1, ENAI, ENA2; and the mechanism of the regulation of their expression including the signal transduction pathway, in which the Ras/cAMP/PKA pathway, Msn2/4p, and STRE are included.