최적 연료주입 모델 추종형 ${\mu}-$합성 제어기의 설계에 관한 연구

황현준,김동완,정호성,손무헌,김영훈,황기현,문경준,박준호,황창선,Hwang, Hyun-Joon,Kim, Dong-Wan,Jeong, Ho-Seong,Son, Mu-Hun,Kim, Yeung-Hun,Hwang, Gi-Hyun,Mun, Kyeong-Jun,Park, June-ho,Hwang, Chang-Sun 제어·로봇·시스템학회 1998 제어·로봇·시스템학회 논문지 Vol.4 No.2

In this paper, we design an optimal model following ${\mu}-$synthesis control system for fuel-injection of diesel engine which has robust performance and satisfactory command tracking performance in spite of uncertainties of the system. To do this, we give gain and dynamics parameters to the weighting functions and apply genetic algorithm with reference model to the optimal determination of the weighting functions that are given by the D-K iteration method which can design ${\mu}-$synthesis controller in the state space. These weighting functions are optimized simultaneously in the search domain which guarantees the robust performance of the system. The ${\mu}-$synthesis control system for fuel-injection designed by the above method has not only the robust performance but also a better command tracking performance than those of the ${\mu}-$synthesis control system designed by trial-and-error method. The effectiveness of this ${\mu}-$synthesis control system for fuel-injection is verified by computer simulation.

Control of IPMC-based Artificial Muscle for Myoelectric Hand Prosthesis

Lee Myoung-Joon,Jung Sung-Hee,Moon Inhyuk,Lee Sukmin,Mun Mu-Seong The Korean Society of Medical and Biological Engin 2005 의공학회지 Vol.26 No.5

This paper proposes an ionic polymer metal composite (IPMC) based artificial muscle to be applicable to the Myoelectric hand prosthesis. The IPMC consists of a thin polymer membrane with metal electrodes plated chemically on both faces, and it is widely applying to the artificial muscle because it is driven by relatively low input voltage. The control commands for the IPMC-based artificial muscle is given by electromyographic (EMG) signals obtained from human forearm. By an intended contraction of the human flexor carpi ulnaris and extensor carpi ulnaris muscles, we investigated the actuation behavior of the IPMC-based artificial muscle. To obtain higher actuation force of the IPMC, the single layered as thick as $800[{\mu}m]$ or multi-layered IPMC of which each layer can be as thick as $178[{\mu}m]$ are prepared. As a result, the bending force was up to the maximum 12[gf] from 1[gf] by actuating the single layered IPMC with $178[{\mu}m]$, but the bending displacement was reduced to 6[mm] from 30[mm]. The experimental results using an implemented IPMC control system show a possibility and a usability of the bio-mimetic artificial muscle.

적조생물 살조세균 탐색 -IV. 살조세균 Micrococcus sp. LG-5가 생산하는 살조물질의 특성과 해양생물에 미치는 영향-

정성윤,박영태,김무찬,최석철,성희경,김재영,김태운,이원재,JEONG Seong-Youn,PARK Young-Tae,KIM Mu-Chan,CHOI Seok-Cheol,SEONG Hee-Kyung,KIM Jai-Young,KIM Tae-Un,LEE Won-Jae 한국수산과학회 2000 한국수산과학회지 Vol.33 No.4

적조생물을 살조시키는 해양세균 Microcorcus sp. LG-5가 생산하는 세포외 분비 살조물질의 최적 생성조건, 살조물질의 특성과 한외여과 분획별 살조활성 및 해양생물에 미치는 영향을 조사함으로서 자연생태 조화형, 환경 친화적 적조방제 기술개발의 기초 자료를 제공하고자 연구한 결과를 요약하면 다음과 같다. Micrococcus sp. LG-5의 살조물질 생성 최적온도는 $20{\~}30^{\circ}C$로 살조활성이 $100{\%}$였으며, 살조물질 생성 최적 pH는 7.0, 최저 염농도는 $3.0{\%}$였다. 또한 세포외 분비 살조물질의 $IC_(50)$ 값은 $0.482{\%}$였다. 세포외 분비 살조물질의 열 안정성을 실험한 결과, 열처리한 배양여과액 $1{\%}$ 첨가시 12시간 후에 $31.4{\%}$, 24시간 후 $79.7{\%}$, 36시간 후 $94.6{\%}$의 살조활성을 보였고 $5{\%}, 10{\%}$의 경우 각자 36시간, 24시간 후에 $100{\%}$ 살조되었으며, 열처리하지 않은 배양여과액을 넣었을 때와 비교해볼 때 살조력에 유의한 차이는 없었다. 이와 같이 Micrococcus sp. LG-5가 생산, 분비하는 살조물질은 열에 안정한 내열성 물질로 판단된다. 또한 대사산물의 pH 안정성은 $pH 6.0{\~}8.0$에서 거의 $100{\%}$의 살조활성을 보였으며 $pH 5.0{\~}10.0$에서 살조활성이 $85{\%}$ 이상으로 나타나 살조물질은 약산성과 알카리에서 살조활성이 안정하였다. 또한 한외여과의 결과, 분자량 $>10,000, 10,000{\~}1,000, <1,000$의 3개의 분획 모두 살조활성이 있었으며, 각 분획 모두 열에 대단히 안정하였다. 각 분획별 $IC_(50)$ 값은 분자량 1,000 이상에서 강한 살조활성이 나타났으며 분자량 1,000 이하에서는 상대적으로 낮은 살조활성을 보였다. Micrococcus sp. LG-5가 해양세균에 미치는 영향은 E. faecalis, E. coli, K. pneumoniae 및 V. alginolyticus에 대해서는 항균력을 보였으나, P. aeruginosa, P. fluorescens, S. typhi, S. aureus, V. cholerae 및 V parahaemolyticus에 대해서는 전혀 항균력을 보이지 않았다. 그리고 적조생물에 미치는 영향은 A. tamarense, E. gymnastica, G. catenatum, G. niikimotoi, G. sanguineum, G. impudicum, H. triquetra, H akashiwo, P. micans와 Pyramimonas sp.에 대해서는 살조활성을 보였으나 Chlamydomonas sp., C. closterium, P. mininum, P. triestimum, Pseudonitzschia sp.와 S. trochoidea에 대해서는 살조활성을 보이지 않았다. 즉, 적조생물에 따라 살조활성이 다양하게 나타나 종 특이성이 낮았다. 먹이생물에 미치는 영향은 1 galbana를 제외하고 실험한 모든 먹이생물에 별다른 영향이 없거나 오히려 성장을 촉진시켰고, 또한 살조세균 배양여과액을 넙치 사육수에 $10{\%}$까지 투여하였을 때 양식 넙치에 미치는 유해한 생리학적 영향은 없었다. 이상의 연구 결과 살조세균 Micrococcus sp. LG-5의 배양여과액은 조사된 적조생물을 제외한 해양세균, 치${\cdot}$자어의 먹이생물 및 양식 넙치에 유해한 영향은 미치지 않을 것으로 판단된다. An algicidal bacterium, Micrococcus sp. LG-5 against the harmful dinoflagellate, Cochlodinium polykrikoides was isolated. The optimal conditions for the highest algicidal activity of bacterial culture filtrate showed in the range of $20{\~}30^{\circ}C$, at pH 7.0 and $3.0{\%}$ of NaCl concentration. In addition, $IC_(50)(mean of 50{\%} inhibitory concentration)$ of the culture filtrate against C. polykrikoides after incubation of 5 days was $0.482{\%}$. To investigate heat and pH stability of the culture filtrate of Micrococcus sp. LG-5, the culture filtrate ($pore size, 0.1 {\mu}m$) was heated to $121^{\circ}C for 15 min$ and adjusted pH from 2.0 to 10.0. There were no significant changes in algicidal activity by heat treatment and the pH change between pH from 5.0 to 10.0. The algicidal substances produced from Micrococcus sp. LG-5 were mainly detected in the fraction of $10,000{\~}1,000$ MWCO (molecular weight cut-off). The culture filtrate of Micrococous sp. LG-5 showed antimicrobial activity against Enterococcus faecalis, Escheiichia coli, Uebsiella pneunioniae and Vibrio altinolyticus, but did not show against Pseudomonas aeminosa, P. Buorescens, Salmonella typhi, Staphylococcus aureus, V. cholerae and V parahaemolyicus. The culture filtrate of Micrococcus sp. LG-5 was examined against 16 phytoplankton species and showed the algicidal activity against Ajexandzium tuarense, Eutreptiella Drnnastin, Gymnodinium catenatum, G. mikimotoi, G. sanguineum, eyodinium impuaicum, Heterocapsa triquetra, Heterosipa akashiwo, Prorocentrum micans and Pyraminonas sp.. However no algicidal effects of Micrococcus sp. LG-5 were observed against Chlamydomonas sp., Cylindrotheoa closterium, P. mininum, P. triestimum, Pseudonieschia sp. and Sczipuiella trochoidea. On the other hand, algicidal activity on the tested marinelivefood was not detected except for Isochrysis galbana. In addition, physiological responses of cultured olive flounder (Paralichthys oliraceus) exposed to $1 and 10{\%}$ of the culture filtrate of Micrococcus sp. LG-5 were measured. There were no clear changes in AST, GGT, creatinine, urea, total cholesterol, total protein, albumine, $Mg^(+2), Ca^(+2), Na^+, K^+, and Cl^-$. These results indicate that olive flounders were not affected when they were exposed to the culture filtrate of Micrococcus sp. LG-5.

耽羅居人 李邦翼의 <漂海歌>에 대한 硏究

成武慶 제주대학교 탐라문화연구소 1992 탐라문화 Vol.0 No.12

볼엔드밀 가공에서 형상정밀도에 관한 실험적 연구

조병무,유익수,이성휘,이동주 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-

In manufacturing process, the. free-formed surface machining using a ball end mill of CNC machining center is important and the geometric accuracy of a 3D workpiece is effected by the cutting characteristics. Machining error is defined the normal distance between designed surface and actual tool path with tool deflection. This is inevitably caused by the tool deflection, tool wear, thermal effect and machine tool errors and so forth. In this study, the geometric accuracies such as roundness in semi-cylinder, free-formed profile and surface roughness were measured using a Coordinate Measurement Machine(CMM) and a contact type surface roughness measuring device. The results will be useful as a guidance for cutting condition to improve the geometrical accuracy of free-formed surface in ball end milling.

茯笭 人工栽培에 適合한 原木과 種菌 接種量 및 接種方法에 關한 硏究

金成敏,申東一,具漢謨,李武鉉,金善喆 공주대학교산업개발연구소 2000 産業開發硏究 Vol.8 No.-

This study was carried out to improve the culturing method of P. cocos, on saving labor and inoculation amount. Therefore, the result of this experiment was as the following. Proper mycelium growth and density of P. cocos was observed in MCM(mushroom complete medium). In the selection of tree species, pine and larch had better in spawn culture and sclerotia formation condition. In the experiment of pine, Yield was 33.7㎏/3.3㎡. In inoculation amount, conventional method(cross slice inoculation) required 16 ~ 20 bottles/1000cc of spawn. In contrast, short log,drilling inoculation method required 8 ~ 10 bottles/1000cc, 2 ~ 3 bottles/1000cc of spawn, which reduced by 50% and 85 ~ 90% of inoculation respectively. In conventional method, the yield of pine was 23.4㎏/3.3㎡. In the case of drilling and short log inoculation, Yield was 28.7㎏ / 3.3㎡(25㎜ / depth) and 30.1kg / 3.3㎡(35mm / depth), 31.7㎏ / 3.3㎡ respectively, Therefore, short log inoculation was increased by 25% and 35% compared with conventional method. In conclusion, management cost was also saved.

전해액의 종류에 따른 치과용 금합금의 전기화학적 부식 거동

고영무,최성욱 대한치과기재학회 2001 대한치과재료학회지 Vol.28 No.1

The effect of different electrolytes on the results from potentiodynamic polarization corrosion testing was studied for 3 different dental gold alloys. The obtained results were as follows. 1.From the potentiodynamic curves the corrosion behavior of natural saliva was similar to that of Darvell's and Hay & Hartles' artificial saliva solution. 2.Fusayama's and Tani & Zucchi's artificial saliva solutions were more corrosive than natural saliva, Darvell's and Hay & Hartles' artificial saliva solution. 3.The corrosion behaviors of Fusayama's and Tani & Zucchi's artificial solutions were very similar in case of Cast-1 and Cast-3. 4.3 kinds of all alloys showed that the amount of gold released was highest in Fusayama's artificial saliva solution. In conclusion, the corrosion behavior of natural saliva was similar to Darvell's and Hay & Hartles' artificial saliva and Fusayama's artificial saliva solution was the more corrosive than any other solutions. But the effect of different electrolytes the corrosion behavior of high gold alloys was not different highly.

e-biz 환경하에서의 대형 유통기업의 고객서비스전략

이홍무,서성수 한국인터넷비즈니스학회 2001 인터넷비지니스연구 Vol.2 No.2

본 연구는 백화점 및 유통산업의 급격한 환경변화에서 고객서비스를 효율적으로 운영해 나가고 있는 여러 국·내외 대형 유통기업들에 대한 사례를 분석함으로서 우리나라 유통기업에게 환경적 변화에 대응할 수 있는 고객 서비스에 대한 전략적 대안을 제시하기 위한 연구이다. 모든 유통기업들은 각 기업을 이용한 고객에 맞는 독특하고 다양한 고객서비스를 펼치고 있다. 이러한 차별화는 각 기업들이 유통산업내에서 생존해 나갈 수 있는 원동력이 되는 것이다. 국내·외 유통기업들이 처해 있는 외부환경을 분석하고 외부환경에 적응하기 위한 기업들의 고객만족 경영에 대한 전반적인 서비스 사항을 분석하여 각 기업만의 고객 지향적인 시스템 갖추었을 때 그 기업은 성공할 수 있을 것이다. As the world is changing in various directions and coming to an age of internet, the distribution enterprises are eagerly searching for strategy to survive in the 21st century. As a strategy to survive in the age of unlimited competition, Internet business in getting a lot of attention recently and many distribution companies are investing tremendous money and efforts into internet Business Internet gives distribution enterprises a competitive edge including various advantages such as the use of E-mail, access to research data, tracking of competitors, cooperation with a remote company at low cost, expansion of service clients and reduction of costs in advertising as well as marketing fields. Thus every distribution enterprise, regardless of its size, has recently been referring to business activities on the internet and using internet business to impress their competitiveness. This study is to suggest how to activate customer service of distribution enterprise through analyzing and studying successful case of distribution enterprises. Some of the important results from this study are as follow : First, distribution enterprise has to develop on-line services and off-line services for customer, because on-line service cannot overtake to origin off-line service for customer. Second, distribution enterrise should need to a high degree of eCRM sistem. Third, distribution enterprise should accumulate the Data Base of current and potential customer, through the efficient management of Data Base, they can have a change to create competition. Fourth, Every distibution enterprise should prepare its unique and various service for customers who use it in an age of e-biz. environment. this differentiation of service is a motive power which enables each enterprise to survive in the distribution industry. Results from this study are expected to help distribution enterprises to develop their strategies of customer service ina e-biz. environment. As the e-biz. is unavoidable trends. distribution enterprises are constantly trying to improve and develope customer services to achieve sustainable competitive advantage(SCA) by means of differentiation, because this can be connected with the enterprise's success or failure.

구매력지수를 활용한 광고예산 배분에 관한 연구

徐聖武,裵斗煥 中央大學校經營硏究所 1998 經營學論集 Vol.25 No.-

점토벽돌제조용 원료로서 석탄회의 재활용성

나춘기,이무성,홍순강 木浦大學校 工業技術硏究所 1997 工業技術硏究誌 Vol.7 No.-

The purpose of this study is to examine the reusability of fly ashs produced by coal-fired power plants as an raw material in the manufacturing process of building resources such as brick, by investigating, in first, the mineralogical and chemical properties of raw materials including fly ashs of the Honam and the Samcheonpo thermal power plants and clay of the Hwangdeung area, and then examining the quility of pilot productions of fly ash-clay brick having various mixing proportions of fly ash. In general, the coal fly ashs separated in grain size under 200mesh and of Honam power plant have higher alkali contents but lower unburned carbon residues than those over 200mesh and of Samcheonpo power plant. This higher contents of alkali components such as CaO and Na2O and lower contents of unburned carbon have contributed to make dense structure in fly ahs-clay brick manufactured. Therefore, the clay brick manufactured by mixture of the Honam fly ash have more dence structure and much higher compressional strength than that of the Samcheonpo, and shows the trend of increasing the compressional strength from 1100-1300kg/㎠ to 170kg/㎠ with increasing the proportion of fly ash part from 10% to 50%. In contrast to Honam fly ash, the compressional strength of clay brick produced by the Samcheonpo fly ash decrease from 600-720kg/㎠ to 270-300kg/㎠ with increasing the mixing ratio of fly ash from 10% to 50%, due to high unburned carbon contents and low alkali contents of Samcheonpo fly ash.