수정 합성 HMT를 이용한 교통표지 분류

현영길,윤종수,도양회 濟州大學校 産業技術硏究所 1999 산업기술연구소논문집 Vol.10 No.1

A classification algorithm of traffic signs using a MSHMT (modified synthetic hit-miss transform) is proposed for the autonomous road vehicles(ARV's). In the case of classification of traffic signs, there are many kinds of signs with intraclass distortions and interclass similarities. The MSHMT provides a good solution with the property of distortion invariant recognition of multiple objects in noisy and cluttered scene. The proposed algorithm of traffic sign classification consists of the phase of sign detection and the phase of symbol recognition. In the phase of sign detection. structuring elements(SEs) are synthesized using only set theory to adapt to simple variations. In the phase of symbol recognition, SEs are synthesized using set theory and SDFkynthetic discriminant function) synthesis method to adapt to complex variations. Based on extensive simulations, it has been shown that the proposed algorithm is efficient for the classification of traffic signs.

질산술코나졸겔의 제조 및 약물방출에 관한 연구

현종목,김경국,지웅길 충남대학교 약학대학 의약품개발연구소 1996 藥學論文集 Vol.12 No.-

Sulconazole nitrate(SCN), an imidazole derivative which has been effective in the treatment of dermatophytosis, tinea versicolor and candidiasis, was formulated as a gel containing drug, poloxamer 407, ethanol and propylene glycol. The resulting SCN gels were evaluated with respect to their viscosity, drug release rate, skin permeation rate. The apparent viscosity of SCN gel increased in proportion to poloxamer 407, drug and propylene glycol concentration. In case ethanol was added, the apparent viscosity decreased. The drug release rate of SCN gel increased in proportion to temperature and ethanol concentration. But the drug release rate decreased as the concentration of poloxamer 407 increased. The increase of drug concentration induced nonlinear increase of drug release rate. When propylene glycol was added at the level of 10%, the drug release rate increased but from 15% it decreased. The skin permeation rate decreased in high concentration of poloxamer 407. The skin permeation rate of SCN gel containing 15% ethanol increased about twice than that of gel without ethanol. The increase of drug concentration induced nonlinear increase of skin permeation rate. When propylene glycol was added at the level of 10%, the skin permeation rate increased but from 15% it decreased.

수정 합성 HMT를 이용한 교통표지 분류

현영길,윤종수,도양회 濟州大學校工科大學産業技術硏究所 1999 尖端技術硏究所論文集 Vol.10 No.1

A classification algorithm of traffic signs using a MSHMT(modified synthetic hit-miss transform) is proposed for the autonomous road vehicles(ARV's). In the case of classification of traffic signs, there are many kinds of signs with intraclass distortions and interclass similarities. The MSHMT provides a good solution with the property of distortion invariant recognition of multiple objects in noisy and cluttered scene. The proposed algorithm of traffic sign classification consists of the phase of sign detection and the phase of symbol recognition. In the phase of sign detection, structuring elements(SEs) are synthesized using only set theory to adapt to simple variations. In the phase of symbol recognition, SEs are synthesized using set theory and SDF(synthetic discriminant function) synthesis method to adapt to complex variations. Based on extensive simulations, it has been shown that the proposed algorithm is efficient for the classification of traffic signs.

이동형 생체계측을 위한 임베디드 컴퓨팅

홍주현,진계환,박경순,조명찬,박길선,차은종,이태수 충북대학교 의과대학 충북대학교 의학연구소 2003 忠北醫大學術誌 Vol.13 No.2

연구목적: 초소형 정밀 기계 기술로 제작된 2차원 가속도 센서와 916 MH2 단거리 고주파 데이터 통신 기술을 응용하여 인체의 운동상태를 자동으로 감지하고 분류하는 기법을 제안 하고자 하였다. 재료 및 방법: 인체의 신호를 획득하기 위하여 미국 버클리대에서 제작한 무선 센서를 등 산용 조끼의 전면상단에 부착해서, 대상자의 흉골 부위에 위치하도록 하고, 앉은 상태에서 일어서거나 눕거나 하는 동작 및 그 역동작이 일어날 때, 가속도 센서에서 감지되는 4가지 종류의 파형 현화에 해당되는 데이터를 무선센서 네트웍을 통해 획득하였다. 결과: 획득한 신호를 주성분분석(Principal Component Analysis)과 지원벡터머신(Support Vector Machine)을 사용하여, 2차주성분까지를 도표화하고 클러스터링 함으로써, 4개의 영역으로 분할하는 것이 가능함을 말 수 있었다 결론: 소형 센서들이 작동되는 임베디드 컴퓨팅 환경에서 일상생활 중에 발생하는 인체의 4가지 동작을 자동으로 감지하고 분류하는 것이 가능함을 보였다. Purpose: New monitoring and classifying method of human motion contort was pro- posed by using 2-axial MEMS accelerometer and 916 MHz short-range data communica-tion technology. Materials and Methods: The wireless sensor of MICA mote was attached to a woman mountain vest and located close to the subject's sternum. During four types of sub-ject's motion, that is, sit-to-stand, stand-to-sit, sit-to-tying, and tying-to-sit, waveform changes of the accelerometer data were acquired by wireless sensor network. Results: The acquired signal was analyzed by Principal Component Analysis(PCA) and Support Vector Machine(SVM) technique. By clustering the first and second principal components, four regions corresponding to the four types of motion, were clearly segment-ed. Conclusion: Human motion context during daily life could be monitored and classified automatically by using small sensors in embedded computing environment

생물변환 천연식용색소 생산공정기술 개발 : Ⅰ. 홍화 황색소의 안정성에 미치는 pH 및 온도의 영향 Ⅰ. Effect of pH and Temperature on the Stability of the Yellow Pigment from Carthamus tinctorious L.

홍성현,박성길,이종민,한태룡,백영숙,정인식 경희대학교 생명자원과학연구원 1999 硏究論文集 Vol.20 No.-

홍화로부터 열에 의한 안정성을 검토하였다. 황색소의 분해반응은 산성, 중성, 염기성 조건에서 UV/Vis spectral measurement에 의해 조사되었다. 시간변화에 다른 흡광도를 측정해 본 결과 온도가 상승함에 따라 황색소의 분해되는 정도가 점차적으로 증가하는 것을 확인 할 수 있었다. 40℃에서 황색소의 분해 반감기는 pH3.0, pH7.0, 그리고 pH12.0에서 각각 112.1, 39.3 과 25.3 시간이었다. 이것은 황색소가 pH3.0에서 비교적 더 안정함을 말한다. pH3.0, 7.0 그리고 12.0에서 황색소의 activation energy는 각각 519, 15.0 그리고 12.3 kJ/mol이었다 We investigated thermal stability of yellow pigment from Carthamus tinctorious L. Decomposition reactions of yellow pigment were monitored at acidic, neutral and alkaline conditions by UV/Vis spectral measurement. Decomposition of yellow pigment increased as temperature increased Decomposition half lives of yellow pigment at 40℃ were 112.1 39.3, and 25.3 hrs at pH 3.0 , pH 7.0, and pH 12.0, respectively, indicating that yellow pigment is more stable at pH 3.0. The activation energies of yellow pigment at pH 3.0, pH 7.0, and pH 12.0 were 51.9, 15.0, and 12. 3 kJ/mol, respectively.

슬라이딩 섹터를 갖은 가변구조제어를 이용한 추적제어

배상현,한종길,손영수 朝鮮大學校 電子情報通信硏究所 2003 電子情報通信硏究所論文誌 Vol.6 No.2

제어이론의 중요한 문제는 유한시간 안에 정해진 수준의 오차 안에서 상태가 원하는 궤적을 따라 이동하도록 플렌트를 제어하는 것이다. 본 논문은 슬라이딩 섹터를 이용한 새로운 추적제어 방식을 제안하며, 슬라이딩 섹터에 라아프노프 함수를 이용하여 안정도를 분석한다. 시스템에 컴퓨터 시뮬레이션을 통하여 제안한 슬라이딩 섹터 제어가 채티링을 줄일 수 있는 것을 확인한다. A problem of major importance in control theory is that of controlling the plant in order to have the state tracking a specific reference trajectory within a prescribed level of tracking error in a finite time. In this paper, new methods of the tracking control using the sliding sector is proposed. This paper analyzes the stability, using Lyapunov function on the sliding sector. Through the computer simulations for the system, it is verified that sliding sector control is capable to reduce the chattering.

초파리 자연집단에 대한 미토콘드리아 DNA와 수용성 단백질의 유전적 변이

추종길,조 현 中央大學校 遺傳工學硏究所 1997 遺傳工學硏究論集 Vol.10 No.1

D. melanogaster와 이 종의 근연종인 D. simulans를 재료로 종내 및 종간 분화과정을 규명하기 위하여 mitochondrial DNA (mtDNA)의 변이를 조사하였고, mtDNA분석 결과와 핵분석 결과를 비교하여 종의 유연관계를 추정하고자 TDE에 의한 수용성 단백질 분석을 실시하였다. D. melanogaster와 D.simulans의 mtDNA의 전체 genome size는 약 19.0kp로 추정되었다. D. melanogaster에서는 site variation (Hae Ⅲ 및 Sca Ⅰ)과 length variation (Hind Ⅲ)이 나타났다. 또한 4종류 (M1-M4)의 mtDNA genotype이 검출되었었으며, 종내 평균 염기치환율이 0.0033로써 낮은 지역분화를 나타내었다. 한편 D. simulans에서는 site variation 및 length variation이 검출되지 않았다. mtDNA와 핵내 DNA에서 유래된 TDE에 의한 cluster 분석 결과는 서로 일치하지 않았다. Mitochondrial DNA (mt DNA) polymorphism of two closely related species of Genus Drosophila (D. melanogaster and D. simulans) was investigated. mt DNA was isolated from 35 and 8 isofemale strains in D.melanogaster and D. simulans, respectively, and were analysed by eight restriction endonucleases. On the basis of mt DNA fragment differences, site variation appeared two restriction endonucleases, HaeⅢ and Sca I, and four genotypes were identified in D.melanogaster. Nucleotide substitution rates among four genotypes were ranging from 0.0032 to 0.0088 (average 0.0033). In addition to, 400bp length variation was found in eight geographical populations. A possible explanation of for low divergence was that mtDNA variation of eight geographical populations in D. melanogaster could not be accumulated sufficiently owing to recent divergence of few individuals, and that sequence divergence was prevented by frequent migration.

NP계 비이온 계면활성제/물/용제 시스템의 상거동에 관한 연구

고현길,임종주 동국대학교 산업기술연구원 2000 산업기술논문집 Vol.11 No.2

본 연구에서는 polyoxyethylene nonylphenyl ether(NP) 계의 비이온 계면활성제, 물, 용제의 3성분 계에 대하여 계면활성제, 용제, 온도 등의 변화에 따른 상평형 실험을 수행하였다. 단일상의 microemulsion은 NP-8 시스템의 경우 50℃ 부근의 조건에서 가장 넓은 영역에 걸쳐서 형성되었으며, 계면활성제의 친수성이 증가할수록 저농도의 계면활성제 영역에서 형성되었다. NP series의 계면활성제 시스템에서 생성된 1 phase microemulsion은 bicontinuous microemulsion 보다는 oil-continuous microemulsioin에 가까운 것으로 전기전도도 측정으로부터 확인할 수 있었다. 동일한 계면활성제 시스템을 온도에 따라 비교하였을 때 온도가 증가함에 따라 상전이가 계면활성제의 고농도 방향으로 진행하였으며, 이때 형성된 1 phase microemulsion은 용제 apex 쪽에서 형성되었다. 즉, 비이온 계면활성제의 친수성이 증가할수록 1 phase microemulsion이 생성되는 온도는 증가하며, 계면활성제 농도는 낮아지는 것을 알 수 있었다. 용제로 D-limonene 대신에 YK series의 탄화수소를 사용했을 경우에는 middle-phase microemulsion을 포함한 3 phase 영역이나 1 phase의 microemulsion이 형성되지 않음을 알 수 있었다. Phase behavior for systems containing polyoxyethylene nonylphehyl ether(NP) nonionic surfactant, water, and solvent was studied. One-phase microemulsion was found over a wide range of compositions at 50℃ in NP-8 surfactant system and surfactant concentration necessary for one-phase microemulsion decreased with an increase in surfactant hydrophilicity. Electrical conductivity measurements showed that the one-phase microemulsion formed with NP series nonionic surfactants used during this study was oil-continuous rather than bicontinuous. Increasing temperature shifted the same phase transitions to the direction of increase in surfactant concentration and one-phase microemulsion was formed near the apex of a solvent. It was also found that temperature necessary for one-phase microemulsion increased with an increase in surfactant hydrophilicity. Neither three-phase region containing middle-phase microemulsion nor one-phase microemulsion was found in the same surfactant system except that YK series hydrocarbon solvent was used instead of D-limonene.

생체용 Ti합금의 양극분극특성에 미치는 Zr 및 Pd의 영향

정종현,이길홍,최칠남,노학,백승남,이상열 대한치과기재학회 1999 대한치과재료학회지 Vol.26 No.2

The corrosion resistance of Ti-Zr-Pd-Cr alloys were investigated in order to reveal their possible use for new biomedical implant materials. Titanium alloys consisting of 10∼20%Zr, 0.0∼0.4%Pd and 0.15%Cr were prepared by vacuum arc-melting as alloying elements instead of using hardness Al and V in response to recent concerns about the long term safety of Ti-6%Al-4%V ELI alloys. The Ti-Zr-Pd-Cr alloys were heat-treated at 1000℃ for 2hrs under a vacuum atmosphere. The effect of Zr and Pd Ti alloys on the corrosion resistance for biomedical implant was investigating the anodic polarization curve at 37℃ in 5%HCI solution deaerated by high-purity N₂gas bubbling. The critical current density for passivation(I ) of Ti-Zr-Pd-Cr alloys didn't reveal markedly. Passive current density(I ) at 1.0V vs. SCE of this alloys decreased with increasing Zr in the contents from 10 to 20% and decreased with containing Pd in the range from 0.2 to 0.4%. Potential(E ) at 0.1A * m-² of this alloys increased with increasing Zr in the contents from 10 to 20% and increased with containing Pd in the range from 0.2 to 0.4%. For the Co-30%Cr-6%Mo alloy, passivity zone is narrow, and rapid increase of current density result from the low potential in comparison with Ti and Ti alloys. The corrosion resistance by the anodic polarization of Ti-20%Zr-0.2%Pd-0.15%Cr alloy was found to be superior to those of the Ti, Ti-6%Al-4%V alloy and Co-30%Cr-6%Mo alloy. The passive films formed on the Ti-20%Zr-0.2%Pd-0.15%Cr and Ti-6%Al-4%V alloys in the anodic polarization test consist mainly of TiO₂, Ti compound, ZrO₂, Al₂O₃and V₂O₃.

부산지역 일부 약수터에 대한 ‘맛있고 건강한 물’의 지표 적용

김현실,김익성,박청길,곽명화,윤철종,박승조 동아대학교 환경문제연구소 2001 硏究報告 Vol.24 No.2

This study was performed to investigate the water quality of some natural mineral springs in Busan. Samples for this study were collected at fifty sites during a year. from March 2000 to February 2001. The overall tendency of mineral was Na>Ca>Mg>K, and the seasonal variation of each components were like this - Ca: Win>Spr>Sum>Aut, Mg: Spr>Win>Sum>Aut, Na: Sum>Aut> Spr>Win, K: Aut>Sum>Spr>Win The K and O index suggested by Hashimoto was followed : delicious water(58%) > not belong to any group(34%) > healthy and delicious water(6%) > healthy water(2%).