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Yoon Nam Jo,Do Gyu Bae,In Chul Um 한국응용곤충학회 2013 한국응용곤충학회 학술대회논문집 Vol.2013 No.10
In this study, silk sericin solutions and films were prepared with different solvents: formic acid and water. Also, silk sericin film from aqueous solution was prepared at different casting temperature. Regardless of solvent type, silk sericin solutions showed a shear thinning implying highly molecular entangled state of silk sericin. Silk sericin aqueous solution showed a higher turbidity than that of formic acid solution. Silk sericin aqueous solution showed shorter gelation time than formic acid. FTIR results showed β-sheet crystallization of silk sericin was affected by casting solvent and temperature. Silk sericin film from aqueous solution showed more β-sheet conformation as the casting temperature was decreased. Silk sericin film from formic acid showed higher crystallinity index than silk sericin films cast from aqueous solution. XRD diffraction measurement showed similar results to those of FTIR. In case of mechanical properties, tensile strength of sericin film from formic acid was higher than sericin films from aqueous solution.
Noise Covariances Estimation for Systems with Bias States
Um, Tae-Yoon,Lee, Jang-Gyu,Park, Seong-Taek,Park, Chan-Gook 서울대학교 항공우주신기술연구소 2000 항공우주신기술연구소 연구보고 Vol.1 No.2
This paper presents a new approach to noise covariances estimation for a linear, time-invariant, stochastic system with constant but unknown bias states. The system is supposed to satisfy controllable/observable conditions without bias states. Based on a restructured data representation, the covariance of a new variable that consists of measurement vectors is expressed as a linear combination of unknown parameters. Noise covariances are then estimated by employing a recursive least-squares algorithm. The proposed method requires no a priori estimates of noise covariances, provides consistent estimates, and can also be applied when the relationship between bias states and other states is unknown. The method has been applied to SDINS initial alignment. Simulation results indicate a satisfactory performance of the proposed method.
엄명용,정순영,이원규 한국컴퓨터교육학회 2003 컴퓨터교육학회 논문지 Vol.6 No.4
본 논문에서는 기존의 LCMS에서 사용되는 평가시스템에 퍼지 추론 규칙을 이용한 적응형 퍼지평가시스템(AFES : Adaptie Fuzzy Evaluation System)을 제안한다. AFES 는 학습자가 하나의 학습코스(learning course)에 들어가기 전에 퍼지진단평가(fuzzy diagnostic evealuation)를 통해 학습자에게 코스수준(course level)을 부여한다. 학습자는 코스수준에 따른 맞춤식 학습경로(learning path)로 학습을 종료한 후, 퍼지최종평가(fuzzy final evaluation)를 통해 최종성적(final grade)을 AFES 으로부터 부여 받는다. AFES, 의 가장 큰 특징은 최종성적의 점수 부여 규칙에 있는데, 만약 서로 다른 학습자가 동일한 문제 수에 대하여 같은 수의 정답을 냈더라도, AFES 는 125 가지 퍼지 추론 규칙(fuzzy reasoning rule)에 의거하여 탄력적으로 서로 다른 최종성적을 학습자에게 부여한다. We introduce an AFES(Adaptive Fuzzy Evaluation System) that applies an evaluation system used to existing LCMS(Learning Contents Management System) to a fuzzy reasoning rule. The AFES confers a course level on the learner through a fuzzy diagnostic evaluation before the learner enters a learning course. After the learner completes a learning course through the tailored learning path that is suitable for the learner’s level, the AFES confers a final grade on the learner by means of fuzzy final evaluation. The biggest characteristic of the AFES is a grade rule of the final grade. Although different learners get the same number of correct answers to the same number of questions, AFES flexibiv confers the different final grade on the learner by means of the number of 125’s fuzzy reasoning rules.
Um, Sang-Won,Yoo, Chul-Gyu,Kim, Young Whan,Han, Sung Koo,Shim, Young-Soo KOREAN ACADEMY OF MEDICAL SCIENCE 2007 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.22 No.5
<P>Because additive effects of inhaled corticosteroids and long-acting anticholinergics are unclear, we undertook this study to compare the efficacy of tiotropium alone and tiotropium plus budesonide in patients with chronic obstructive pulmonary disease. The study subjects were randomized to receive either tiotropium 18 µg once daily with or without budesonide 200 µg twice daily for 6 weeks. The efficacy variables were changes in trough forced expiratory volume in one second (FEV1), St. George's Respiratory Questionnaire (SGRQ), 6-minute walk distance (6MWD), and use of rescue medication. One hundred patients were randomized and 81 completed the study. The mean age was 64.0 yr, and the mean FEV1 was 39.7% predicted. Compared with tiotropium alone (N=40), the tiotropium/budesonide combination (N=41) was related to an improvement in the SGRQ total score (tiotropium -2.8 units and tiotropium/budesonide -5.6 units, <I>p</I>=0.003). 6MWD was improved by 13.5 m in the tiotropium group and by 22.5 m in the tiotropium/budesonide group (<I>p</I>=0.031). Changes in trough FEV1 and the use of rescue medication were similar between two groups. In conclusion, compared with tiotropium alone, the tiotropium/budesonide combination was related to an improved health-related quality of life. These data support that low-dose budesonide may enhance the efficacy of tiotropium.</P>
Um, Hyo Jeong,Kong, Gyu Don,Yoon, Hyo Jae American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.40
<P>Top contacts for molecular-scale electronic devices should exhibit reliable and reproducible electronic performance. This goal is challenging and difficult to achieve because metals are usually evaporated under high-energy conditions that easily damage delicate organic surfaces, and complicated nanofabrication processes are needed for achieving geometrically defined small contact areas. Soft top contacts that are made by users under ambient conditions can circumvent this problem but often show user-dependence. This paper describes that thermally controlled phase transition (TCPT) of low-melting (29.76 °C) electrode comprising gallium covered with a self-passivating oxide layer could be useful to form reliable, spontaneous (i.e., user-independent) top contacts over delicate ultrathin organic films such as self-assembled monolayers (SAMs). As a proof-of-concept, we demonstrate that the phase transition from solid to non-Newtonian liquid for gallium electrode is tuned under mild thermal conditions (room temperature to ∼50 °C), which does not damage the organic component and ensures conformal, geometrically defined contacts. The contact force predominantly depends on wetting of compliant liquid gallium onto SAMs, upon heating, not on user-pressure. Indeed, the TCPT-based large-area tunnel junctions on SAMs of <I>n</I>-mercaptoalkanoic acids yield markedly narrow dispersion of tunneling current density (σ<SUB>log|<I>J</I>|</SUB> = 0.04-0.19) and tunneling attenuation coefficient (β = 0.92 ± 0.02<I>n</I><SUB>C</SUB><SUP>-1</SUP>) consistent with the literature value. We envisage that our approach can be harnessed to accomplish liquid metal-based tunnel junctions without significant user-to-user variations and hence useful for reliable understanding of charge transport across molecules and practical applications.</P> [FIG OMISSION]</BR>
고려엉겅퀴와 큰엉겅퀴의 모상근 유도 및 methyl jasmonate 처리에 따른 HPLC 패턴 변화
Tae Gyu Yi,Jong Dai Son,Yeri Park,Byung Hun Um,Nam Il Park 한국약용작물학회 2017 한국약용작물학술대회 발표집 Vol.2017 No.05
Background : Cirsium plants have been used for perennial edible plants and grow wild in the mountainous regions of Korea, including Cirsium setidens and C. pendulum. In particular, C. setidens is commonly called 'gondre', and it has been used medicinally for diseases such as hematuria, hepatitis and hypertension. Hairy roots cultivation can be used as a method for increasing production through mass culture of medicinal plants, and elicitors such as methyl jasmonate (MeJa) can be treated to increase the content of certain useful ingredients. In this study, the hairy root was derived from the leaf tissues of C. setidens and C. pendulum, and the HPLC pattern was compared by MeJa treatment. Methods and Results : Agrobacterium rhizogenes R1000 was used to induce hairy roots in 1/2× MS medium. In addition, the hairy roots was treated with MeJa for different time (0, 1, 2, 5, 10, 24, 48, 72 h) and with various concentrations (0, 10, 50, 100, 200, 300 μM). The HPLC pattern changes were analyzed by on-line HPLC-ABTS. Four new peaks were observed in both Cirsium setidens and C. pendulum hairy roots, all of which showed antioxidant activity. In the case of C. pendulum, chlorogenic acid content was about 4 times higher than that of leaves. These peaks, including chlorogenic acid, were all affected by MeJa treatment. Conclusion : Four peaks were detected in the hairy roots of C. setidens and C. pendulum not in the leaves, and they were confirmed to be affected by the treatment of MeJa. It is necessary to clarify the structure through the subsequent compound separation.