임의의 이산 포화 제어 시스템에 적용가능한 정적 리셋 와인드엎 방지 방법

박종구 成均館大學校 科學技術硏究所 1997 論文集 Vol.48 No.1

This paper presents an anti-reset windup (ARW) compensation method for discrete-time saturating control systems with multiple controllers and/or multiloop configuration, which can be generalized to arbitrary control system structures. The proposed ARW method is motivated by the concept of equilibrium point. The design parameters of ARW scheme is derived explicitly by minimizing a reasonable performance index. In the event of saturation, the resulting dynamics of compensated controller reflects the dynamics of linear closed-loop system. The proposed method guarantees the total stability of resulting control systems under a certain condition. An illustrative example is given to show the effectiveness of the proposed method.

연근의 열수 추출물이 흰쥐의 국소 뇌혈류량과 혈압에 미치는 영향

박성혜,신언환,구재근,이태헌,한종현 동아시아식생활학회 2005 동아시아식생활학회지 Vol.15 No.1

The purpose of this study was to measure the changes of regional cerebral blood flow(rCBF) and blood pressure(BP) in rats, following the intravenous injection of Nelumbo nucifera water extract. The measurement was continually monitored by laser-doppler flowmeter and pressure transducer in anesthetized adult Sprague-Dawley rats for about 2 to 2 and half hours through the data acquisition system composed of MacLab and Macintosh computer, The results of this experiment were as follows. Nelumbo nucifera significantly increased the changes of rCBF in rats. The rCBF of Nelumbo nucifera was not changed by pretreated propranolol, atropine, L-NNA and indomethacin. But the rCBF of Nelumbo nucifera was decreased by pretreated methylene blue. Nelumbo nucifera decreased the BP significantly, The BP of Nelumbo nucifera was not changed by pretreated propranolol, atropine, L-NNA and indomethacin. But the BP of Nelumbo nucifera was decreased by pretreated methylene blue. These results indicated that Nelumbo nucifera might increase the rCBF and decrease the BP which related to guanylyl cyclase activity.

발생원별에 따른 PAHs 배출특성

박찬구,윤중섭,김민영,손종열,모세영 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.3

The results of individual PAH source profiles that can be applied to receptor model are as follows. The sum of 16 PAH concentrations was 391.41 ng/S㎥ in a tunnel. Phenanthrene was the most abundant compound among 16 PAH, and then pyrene, fIuoranthene, anthracene, and naphthalene can be seen in elevated contents. 11,056.61 ng/S㎥ of 16 PAH concentrations in BC oil boiler was two times higher than 6,582.57 ng/S㎥ of those in LNG boiler. Naphthalene was the most abundant compound in both facilities. Phenanthrene, anthracene. and acenaphthylene were the second dominant compound group in order from both facilities. BC oil boiler had relatively high concentration of pyrene compared to LNG boiler that had high concentration of fluorene and did not detect pyrene. The sum of 16 PAH concentrations emitted from MSW incinerators after APCD (air pollution control device) was three times higher than those from MSW incinerators bcfore APCD. However, the concentrations of more than 4-ring PAH compounds (e.g., benzo (a)anthracene) before APCD were higher than those after APCD. This fact implies that PAHs generated by combustion process are eliminated in APCD and they are continuously produced in stack or atmosphere by PAHs precursors.

수정 IPA를 활용한 산업혁신운동의 효과적 추진요인 분석 : ISO 9001 인증 중소기업을 중심으로

박종갑,구일섭 남서울대학교 2017 남서울대학교 논문집 Vol.23 No.-

대장균의 GlnE 유전자 조절 부위의 염기서열 분석에 관한 연구

박종환,이영규,노연희,구자현 건국대학교 1996 學術誌 Vol.40 No.2

The enzymatic activity of glutamine synthetase (GS) which is a major enzyme assimilating nitrogen in enteric bacteria is modulated by a bicyclic cascade that consists in adenylylation / deadenylylation of GS and uridylylation / deuridylylation of a regulatory protein PII. The adenylylation of GS converts the enzyme to an inactive form. The cunverter enzyme for the adenylylation / deadenylylation cycle is adenylyltransferase (AT), a bifunctional enzyme. It is known that many of regulatory proteins of GS are affected by the nitrogen content in medium. In this study, glnE gene sequence from BamHI to Sali restriction site was determined to elucidate the possibility of its nitrogen sensing ability by searching the consensus sequence(WGCA) found in other nitrogen utilizing operons. The results are as follows ; 1) The nucleotide length of a part of glnE gene was 1203 dp and the initial codon ATG was determined by comparing the sequence with 13 amino acid residues from N-terminus of AT. 2) The probable consensus sequence TTGCA showing high homology with those of other nitrogen utilizing operons was found at 43 bp upstream region from the start point. Actual nitrogen sensing capability of glnE gene should be tested to find the complex regulatory mechanism of GS cascade system for further study.

單相 4象限 CONVERTER 運轉

박종덕,심재명,김영달,전승구 大田産業大學校 1996 한밭대학교 논문집 Vol.13 No.0201

In this paper, I have studied basic theory about the operation of single phase four-quadrant converter using MOSFET and theoretical study and efficient operation domain about each mode which is the operation of DC power mode and AC power mode. Especially I have done computer simulation about harmonic problems in conversion AC power and analysed this problem through the experiment. MOSFET in the converter has been used to make switching speed so fast for the purpose of decreasing lower harmonics in PWM. On the other hand, I have studied power-regeneration by experiment to convert 60Hz AC.

최단경로를 이용한 단순체인의 가시성에 관한 연구

구화본,엄종훈,박세명 인제대학교 1992 仁濟論叢 Vol.8 No.2

계산 기하학에서 가시성에 관한 문제는 컴퓨터 그래픽스, 로보틱스, 화상처리, CAO/CAM, 최단 경로 문제, 영역분리등의 분야에 음용이 되고 있다. 본 논문에서는 단순 다각형과 그 다각형의 단순 체인이 주어질때, 그 체인에 대해 가시성 여부를 결정하고 비가시적일때 가시성 다각형을 구하는 방법을 연구하였다. 기본 개념은 전처리 단계에서 주어진 다각형을 0(n)시간에 삼각화하고, 체인의 양끝점에서 다른 모든 절점으로 가는 최단 경로를 계산한다음, 체인의 가시성 다각형을 선형시간에 구하는 알고리즘을 제시하고 있다. In this paper, given a simple polygon and a simple chain ch(Vs,Vt), the notion of the chain visibility polygon of a simple polygon P is introduced, and an optimal algorithm for finding the chain visibility polygon in a simple polygon is presented. In the preprocessing step, the simple polygon is triangulated, and computed shortest path from Vs and Vt to all other vertices in linear time. Then, condensed dual tree composed of triangles of triangulation is traversed and visible areas from the chain is computed and merged in linear time.

GIS를 이용한 양식어장 정보관리 시스템 구축

박성은,최우정,이원찬,구준호,정래홍,박종수 한국지리정보학회 2004 한국지리정보학회지 Vol.7 No.3

연안 양식어장의 정보 관리에 실용적인 지리정보시스템(GIS)을 적용함으로써 어업종사자와 연안 관리자에게 실현 가능한 관리방안을 제시하고 수산업 발전을 위한 유연한 의사결정의 기반을 마련하고자 하였다. 연안 양식어장의 효과적 관리는 경제적 실행 가능성과 운영비용에 영향을 미치며 양식 대상생물의 생산 및 사망률과도 관계가 있으므로 매우 중요하다. GIS는 양식어장 정보의 효율적인 관리도구로서 개인 및 공공분야에서 폭넓게 사용되고 있으며 해양수산 관련분야에서도 활발히 적용되고 있다 본 연구에서는 진해만을 대상으로 연안 양식장 자료의 3차원 가시화 모듈을 구축하였다. This paper illustrates some practical geographic information system (GIS) applications for aiding fishery managers and coastal area planners in analysing the likely control scheme of coastal farming areas, and in providing a flexible framework for decision making on fishery development and zoning issues. The effective management of marine farming operation is vitally important since it can greatly influence economic availability by determining capital outlay and by affecting running costs, rates of productions and mortality factors. GIS has been widely adopted elsewhere as a potent management tool in both the private and public sectors. GIS is now being extensively adopted in marine-associated activities. Here, we have used GeoMania v2. 5 GIS software and its 3D Analyst extension module to visualize marine farming areas data that were collected around the Jinhae bay.

Cr첨가에 따른 자동차용 소결 밸브시트의 미세조직과 기계적 성질

具原奭,朴種寬,崔昌守,정인상 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.8

Valve seat inserts are used in the valve train area of internal combustion engines. Good wear resistance is needed since repeated stress is applied by the valves under combustion gas atmosphere of high temperatures. Currently, most of the valve seat inserts are being manufactured by P/M route. In this study, the characteristics of materials especially the wear resistance with the addition of Cr-hard particles were investigated. The results of this study are as follows: increase in the Cr-hard particles resulted in a decrease of the density of specimens. Pores formed by Cr diffusion from Cr-hard particles was attributed to the reduction in density. As a result, radial crushing strength was decreased with increase of the Cr-hard particals. Engine simulation test indicated that matrix can be hardened with the addition of Cr-hard particles. The excess addition of Cr-hard particles, however, degrades the wear resistance by the increase of residual pores. Therefore, the appropriate amount of Fe-Cr-C hard particles is 1∼5 wt%.

청미래덩굴의 뿌리에서 추출한 조분획의 항균활성

박인호,권혁동,이원구,송종호 東亞大學校附設基礎科學硏究所 1998 基礎科學硏究論文集 Vol.15 No.1

청미래덩굴(Smilax china L.)의 뿌리에서 추출한 methanol, n-hexane, chloroform 및 수용성 추출물의 항균활성을 Agrobacterium rhizogenes, Agrobacterium tumefaciens, Candida utilis, Saccharomyces cerevisiae, Bacillus megaterium, Bacillus natto, Bacillus subtilis 및 Escherichia coli에 대하여 disc diffusion과 broth dilution method로 조사하였다. Methanol추출물은 A. rhizogenes, A. tumefaciens, B. megaterium 및 B. subtilis 대하여 항균활성이 나타났고, 수용성 추출물은 B. megaterium와 B. subtilis에 대하여 항균활성을 보였으나 hexane과 chloroform 분획물은 항균활성이 없었다. 또한 수용성 추출물은 800ppm 농도에서 현탁배양중인 A. rhizogenes, A. tumefacience, B. megaterium 및 B.subtilis에 대하여 각각 80, 40, 20, 81%의 성장 억제를 보였고, 특히, 동일 농도의 수용성 추출물을 재첨가한 경우 B. subtilis의 성장이 완전히 억제되었다. Gas chromatography/mass spectrometry에 의한 추출물의 분석 결과, 그 주요 구성 성분은 5-(hydroxymethyl)-2-furancarboxaldehyde(46.95%), 2,3-dihydro-3,5-dihydroxy-6-methyl-4H-pyran-4-one(21.08%) 및 2-furancarboxaldehyde(5.85%)였다. Antimicrobial activity of four extract fractions from the root of Smilax china L.(Liliaceae) was investigated by diffusion and broth dilution methods against several microorganisms, Agrobacterium rhizogenes, Agrobacterium tumefaciens, Candida utilis, Saccharomyces cerevisiae, Bacillus megaterium, Bacillus natto, Bacillus subtilis and Escherichia coli. Methanol extract exhibited potent antimicrobial activity against A. rhizogenes, A. tumefaciens, B. megaterium and B. subtilis. However, hexane and chloroform extracts did not show antimicrobial activity against the test microorganisms. Aqueous extract inhibited growth of the tested microbial strains. The relative growth inhibition of A. rhizogenes, A. tumefaciens, B. megaterium and B. subtilis were 80, 40, 20, 81% at 800㎍/mL, respectively. Methanol extract was analyzed by gas chromatography/mass spectrometry(GC/MS). Major components were determined to be 5-(hydroxymethyl)-2-furancarboxaldehyde(46.95%), 2,3-dihydro-3,5-dihydroxy-6-methyl-4H-pyran-4-one(21.08%) and 2-furancarboxaldehyde(5.85%).