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입력 지연을 갖는 배터리 시스템의 중심성 분석을 활용한 동기화 연구
이찬우,이용권,김영재,권오민,이승훈,윤재중 한국통신학회 2024 韓國通信學會論文誌 Vol.49 No.9
본 논문에서는 입력 지연을 갖는 전기적으로 연결된 배터리 시스템의 중심성 분석을 활용한 동기화 제어기 설계가 연구되었다. 리아프노프-크라소프스키 함수(Lyapunov-Krasovskii functionals), 중심성 분석 방법, 몇 가지 보조정리와 수학적인 사실들을 이용하여, 시스템의 동기화를 위한 선형 행렬 부등식의 형태로 조건을 도출하며, 동기화 제어기 이득을 구한다. 얻어진 결과의 유효성 분석을 위해서 배터리 시스템 등가회로 수치 예제에 적용하고, 중심성 분석 활용 유무에 따른 결과를 비교하였다. In this paper, synchronization controller design via centrality analysis of electrically connected battery systems with input delay is studied. By utilizing Lyapunov-Krasovskii functionals (LKF), centrality analysis method, some useful lemmas and mathematical facts, a synchronization criterion is derived in terms of linear matrix inequalities (LMIs) and the synchronization controller gain is obtained through the feasible solution of the established LMIs. For analyzing effectiveness of the proposed result, a set of battery systems equivalent circuit numerical example is applied, results with or without centrality analysis utilization are compared.
선박의 초기설계 제품정보관리를 위한 PLM 시스템 원형 개발
이찬우,이장현,이경호,이재범,김대석,서흥원,Lee, Chan-Woo,Lee, Jang-Hyun,Lee, Kyung-Ho,Lee, Jae-Beom,Kim, Dae-Seok,Seo, Heung-Won 한국전산구조공학회 2008 한국전산구조공학회논문집 Vol.21 No.6
최근의 제조 산업에서 제품개발 정보는 제품 수명주기 관리(PLM: Product Lifecycle Management) 시스템을 통하여 관리하고, 조달과 생산 계획에 관련된 통제는 전사적 자원관리(ERP: Enterprise Resource Planning), 생산 관리 시스템이 담당하고 있다. 특히, 효율적인 제품 개발과 시스템 구축 여부는 설계 및 생산, 원가 관리 전체에 걸쳐 영향을 미친다. 따라서 도면, 모델, 자재 정보 등 제품정보관리를 위한 PLM시스템의 역할이 매우 중요하게 여겨지고 있다. 이러한 PLM체계는 요구 사항 분석, 시스템 설계 그리고 기존 Data Migration 등 정보 시스템 개발 절차를 따라서 수행된다. PLM시스템은 전사적인 시스템 개발 과정에서 Prototype개발을 진행하여 구축 절차와 체계 설계를 검증하는 것이 효과적이다. 이 과정에서 PLM 아키텍처 및 제품 구조(Product Structure) 구성, PLM의 기능 개발을 수행한 후에 전체 시스템 설계 개발을 재 수행하는 것이 효과적이다. 본 연구에서는 조선 PLM구축에 필요한 절차와 체계 설계 방법을 제시하고, 이를 초기 기본 설계 단계에 적용하여 PLM구축 방법론을 제시하고자 한다. 초기 설계를 대상으로 요구사항을 도출하고, PLM의 아키텍처를 설계하였으며, 설계한 시스템을 Prototype형태로 제시하였다. Shipbuilding is a kind of ETO(Engineering To Order) industry which designs and produces a product in accordance to various requirement of customers, rules and regulations. Recently, the number of ordered ships has been increased by up to two or three times in each domestic shipyards. Most shipyards have been adopted 3D ship CAD, ERP(Enterprise Resource Planning) and APS(Advanced Planning System) to get an efficient product development and manufacturing system. However, not only the effective operation of 3D ship CAD, ERP and APS but also the production efficiency can be achieved only if product information management which can manages the product data is implemented in an integrated environment. Present study has suggested a systematic approach to implement a PLM system to manage the product data in early design shipbuilding. Also, a prototype of PLM is implemented to manage the product data in a basic ship-design. In the prototype system, a product structure and architecture of PLM is considered.
Polyethyleneimine Derivative for Nucleic Acid Model
이찬우,채희정,Young Jin Kwon 한국생물공학회 2005 Biotechnology and Bioprocess Engineering Vol.10 No.3
Water-soluble polyethyleneimine (PE) derivatives containing nucleic acid bases and hydrophilic amino acids such as homoserine (Hse) and serine were prepared by the activated ester method as nucleic acid models. From spectroscopic measurements, the polymers were found to interact with DNA accompanied by an induction of conformational change. Hypochromicity in UV spectra indicated that a stable polymer complex was formed between poly (A) with PEI-Hse-Ura by complementary hydrogen bonding with equimolar nucleic base units (adenine:uracil = 1:1). The induced conformation of DNA by the interaction with the polymer containing uracil and homoserine (PEI-Hse-Ura) was concluded to be a super triple helical structure. The formation of the polymer complex, DNA : PEI-Hse-Ura, was found to be affected by the presence of metal ions such as Ca2+ and Cu2+.
이찬우 한국고분자학회 2004 Macromolecular Research Vol.12 No.1
We have synthesized various types of poly(ethylene glycol) (PEG)-ibuprofen conjugates by the nucleo¬philic substitution of bromo-terminated PEG with ibuprofen-Cs salt; PN (Pluronic) was also used in place of PEG. All the bromo-terminated PEGs and PN were obtained in high yield. Conversions of the terminal hydroxyl groups to bromo-termini were quantitative, as were the drug conjugation processes. The I1/I3 values obtained from solutions of the ibuprofen-conjugated prodrugs are summarized in relation to those of ibuprofen in water and in aqueous solutions of the original PEG, PN, and several ordinary surfactants. We believe that the fully hydrophilic PEG is completely hydrated and forms no hydrophobic pocket by segment aggregation. These results indicate that the probe environment is significantly hydrophobic, particularly in the solution of prodrug PN, for which the ratio is similar to that obtained from typical micelles of surfactants. The results suggest, therefore, that the present synthetic method is very useful for preparing PEG-based prodrugs from pharmaceu¬ticals having carboxyl functionalities.
이찬우 한국고분자학회 2004 Macromolecular Research Vol.12 No.1
We have synthesized various types of poly(ethylene glycol) (PEG)-ibuprofen conjugates by nucleo¬philic substitution of bromo-terminated PEG with ibuprofen-Cs salt. The conversion of the terminal hydroxyl groups to bromo-termini was quantitative, as was the drug conjugation process, which suggests that the present synthetic method is very useful for the preparation of PEG-based prodrugs from pharmaceuticals having car¬boxyl functionalities. The drug-release behavior of the prodrugs was examined in both phosphate buffer (PBS, pH 7.4) and rat plasma. From the drug-release behavior in PBS, we determined that each prodrug has high stor¬age stability. The drug-release rate was observed to be much faster in rat plasma than in buffer solution as a result of the acceleration effect provided by enzymes present in the plasma. The drug-release rate in rat plasma depends on the degree of molecular aggregation of the prodrugs, which can be changed effectively by the nature of their spacer groups or by the use of Pluronic as the polymer carrier.
이찬우,송봉근,제갈종건,Yoshiharu Kimura 한국고분자학회 2013 Macromolecular Research Vol.21 No.12
Histocompatibility of biodegradable aliphatic polyesters was examined by cell adhesion and cell proliferation tests by using fibroblast 3T3-L1 cells. It was found out that the cell adhesion decreased in the order of polystyrene (PS)>poly(L-lactide) (PLLA)>poly(3-[R]-hydroxybutyrate/valerate) ([R]-PHB/HV)>poly(butylene succinateco-lactide) (PBSL)>poly(3-[RS]-hydroxybutyrate) ([RS]-PHB). Particularly poor cell adhesion was shown for [RS]-PHB even after fibronectin had been pre-adsorbed, and cell proliferation and extension were not observed on [RS]-PHB. These different behaviors in cell adhesion could not be well explained by the differences in wettability and roughness of the film surfaces of these polymers. ATR-FTIR analysis of these films revealed that the surface concentration of methyl groups is significantly higher in the [RS]-PHB film than the other films. It was therefore considered that the poor cell adhesion of [RS]-PHB is attributable to the structural change of the protein adsorbed on the methyl-accumulated surface.