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구자민,김대균,류택희,정은환,Yves Lansac,장윤희 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.3
Push-pull-type copolymers − low-band-gap copolymers of electron-rich fused-ring units (such as cyclopentadithiophene; CPDT) and electron-deficient units (such as benzothiadiazole; BT) − are promising donor materials for organic solar cells. Following a design principles proposed in our previous study, we investigate the electronic structure of a series of new CPDTBT derivatives with various electron-withdrawing groups using the time-dependent density functional theory and predict their power conversion efficiency from a newlydeveloped protocol using the Scharber diagram. Significantly improved efficiencies are expected for derivatives with carbonyl [C=O], carbonothioyl [C=S], dicyano [C(CN)2] and dicyanomethylene [C=C(CN)2] groups, but these polymers with no long alkyl side chain attached to them are likely to be insoluble in most organic solvents and inapplicable to low-cost solution processes. We thus devise several approaches to attach alkyl side chains to these polymers while keeping their high efficiencies.
개에서 외부고정법을 이용한 양측성 하악골절의 치유 일례
구자민,김현희,박대식,장흥희,이효종,이후장,송해룡,이용훈,정종태,연성찬 한국임상수의학회 2003 한국임상수의학회지 Vol.20 No.1
A 5-year-old, male mixed breed dog was presented to Gyeongsang National University Animal Hospital for bilateral mandibular open fracture by bite. The dog had loss of the teeth and injury of the oral mucosa. Radiographic and blood examinations were conducted. Fracture lines were observed between first premolar and second premolar, but temporomandibular luxation was not observed on radiographs. In serum analysis, elevated levels of CPK and LDH were found. The dog was anesthetized and prepared for aseptic surgery. Acrylic external skeletal fixator with Kirschiner wire was applied. Pin loosening and malalignment of the right fracture line was observed at 7 weeks after surgery. We applied Kirschner-Ehmer fixator and half pins during the second surgical procedure. At 4 weeks after a second surgical procedure, the fixator and pins were removed from mandible. The fractures were healed with no complications.
Butorphanol의 투여가 장문합술 후 개의 행동에 미치는 영향
구자민,연성찬,이희천,장홍희,성용증,이효종 한국임상수의학회 2005 한국임상수의학회지 Vol.22 No.1
This study was performed to investigate non-invasive behavioral pain assessment of dogs after surgery, and the analgesic effects of butorphanol after intestinal anastomosis in dogs. In this study, five dogs in the Control Group were anesthetized, but did not undergo surgery. Five dogs in the Analgesic Group were undergone intestinal anastomosis and treated with butorphanol. Five dogs in the Non-analgesic Group were also undergone intestinal anastomosis without analgesic treatment. The dogs in the Analgesic Group received butorphanol (0.4mg/kg, IM) before and immediately after operation, while dogs in Control and Non-analgesic Groups received isovolumetric doses of sterile saline. The behavior of dogs were videotaped for 400mins after anesthesia, during which time a researcher interacted with the dog once per each 80 mins. At each interaction, the researcher recorded behavioral pain score, using University of Melbourne Pain Scale. Interactive and non-interactive behaviors were observed and quantitated by a single observer using focal continuous sampling method. Vocalizations were obtained during 400mins after anesthesia, and duration of call, intensity, pitch, 1-4 Formant were analyzed. Surgery affected an increasing of pain score. During interactions with researcher, greeting behaviors were decreased after surgery. Differences between Analgesic group given analgesic or that given a placebo drug were readily understood using quantitative behavioral measurements and vocalization. Significant difference between Analgesic group given butorphanol or that the given placebo drug was apparent(p<0.05).
구자민,류지성,정규혁,이철우,박응로,박광식 환경독성보건학회 2001 환경독성보건학회지 Vol.16 No.4
Endocrine disruption in crucian carp (Carassius auratus) living in the branch of Han River were examined. Vitellogenin level in plasma was measured using ELISA system and aromatase mRNA level in brain was observed using RT-PCR technique. In all female fish, vitellogenin levels were in the range of 20~40 μg/ml and aromatase mRNA expression could be detected on the agarose gel after RT-PCR. However, in case of males, vitellogenin level was elevated in only one fish, while vitellogenin was hardly detected in others. Aromatase was expressed in all males although the levels were relatively lower than the level in female fish. Testis-ova and any other histological changes of reproductive organ were not shown in both sexes.
1P-36 Preparation and thermomechanical properties of thermoset polyurethane shape memory polymer
구자민,김광인,김태균 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
This study is to investigate the thermomechanical properties according to the change of hard and soft segment ratios and diol types of polyurethane-based thermoset shape memory polymers(SMPs). SMP films were prepared by reaction of IPDI-prepolymer and three-functional polycaprolactone(PCL) diol. The three kinds of IPDI-prepolymers were synthesized with three different diols that were bisphenol-A, polyoxyethylene bisphenol-A ether and polytetramethylene ether glycol (PTMEG). Also, each IPDI-prepolymer was designed to have different isocyanate equivalent weight. the glass-transition temperature was characterized by dynamic mechanical analysis(DMA), fixity and recovery ratios are investigated using universal testing machine(UTM).
Cell-free Systems: Recent Advances and Future Outlook
구자민,양지호,박현준 한국생물공학회 2020 Biotechnology and Bioprocess Engineering Vol.25 No.6
Cell-free systems utilize a subset of cellular components without intact cell wall and/or membranes. The system was first invented for use in fermentation. Subsequent improvements enabled its application in protein synthesis, which is still the most common use of the system. Lately, attempts have been reported where metabolic engineering concepts and techniques were applied to cell-free systems and/or vice-versa. These attempts and advances led to exciting discoveries about biochemical reactions, as well as properties and/or structures of cellular components that make up complex biological systems. This review will first provide a basic overview and brief history of the cell-free system. Then, explanation on recent advances in the field will be provided, followed by notes on the innovative applications. Future outlook of the field will also be covered with the emphasis on how the emerging data science methods can be applied to improve the system and its applicability.
NOAA-AVHRR 자료를 이용한 1km 해상도 벼논 피복의 간이분류법
구자민,홍석영,윤진일 한국농림기상학회 2001 한국농림기상학회지 Vol.3 No.4
Land surface parameterization schemes for atmospheric models as well as decision support tools for ecosystem management require a frequent updating of land cover classification data for regional to global scales. Rice paddies have not been treated independently from other agricultural land classes in many classification systems, despite their atmospheric and ecological significance. A simple but improved method over conventional land cover classification schemes for rice paddy is suggested. Normalized difference vegetation index (NDVI) was calculated for the land area of South Korea at a 1㎞ by 1㎞ resolution from the visible and the near-infrared channel reflectances of NOAA-AVHRR (Advanced Very High Resolution Radiometer). Monthly composite images of daily maximum NDVI were prepared for May and August, and used to classify 4 major land cover classes: urban, farmland, forests and water body. Among the pixels classified as "forests" in August, those classified as "water body" in May were assigned a "rice paddy" class. The distribution pattern of "rice paddy" pixels was very similar to the reported rice acreage of 1,455 Myons, which is the smallest administrative land unit in Korea. The correlation coefficient between the estimated and the reported acreage of Myons was 0.7, while 0.5 was calculated from the USGS classification.