• Archives of Pharmacal Research
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• 제12권4호
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• pp.295-299
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• 1989

Two novel steroidal saponins designated as spicatosides A(1) and B(2) were isolated from the tubers of Liriope spicata and their structures were elucidated as 25(S)-rus-cogenin -1-0- fJ - D-glucopyranosyl (1$\rightarrow$2)- [$\beta$ - D-xylopyranosyl (1$\rightarrow$3)] -$\beta$- D- fucopyranoside (1) and 26-0-$\beta$-D-glucopyranosyI25(S)-22-0-methyl-furost-5-en-l$\beta$, 3$\beta$, 26-trioll-0-fJ -D¬glucopyranosyl (1$\rightarrow$2)- [$\beta$- D-xylopyranosyl (1$\rightarrow$3)] - $\beta$- D- fucopyranoside (2), respectively.

• 로봇학회논문지
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• 제14권3호
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• pp.179-185
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• 2019

This paper presents cable-hydraulic driven 3DoF (Degree-of-Freedom) manipulator for cooperative robot with high output/low inertia and enhancing lager workspace of hydraulic manipulator. Hydraulic actuation could be solution to design more higher output manipulator than the one of electric motor actuation due to install actuation source and robot joint separated. In spite of this advantage, the conventional hydraulic driven manipulator using cylinder or vane actuator is not suitable for the candidate of cooperative robot because smaller workspace owing to small RoM (Range of Motion) hydraulic actuator. In this paper, we propose 3DoF manipulator with cable-hydraulic actuation which is more larger ratio of payload-to-weight than the one of conventional cooperative manipulator and larger workspace than the one of existing hydraulic driven manipulator. The performance of proposed manipulator was demonstrated by the experiments for confirming overall workspace task, high payload operation task under worst situation and comparing repeatability between developed manipulator and existed cooperative robots. The results of experiments showed that the appropriate performance of proposed manipulator for cooperative robot.

• 한국작물학회지
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• 제67권2호
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• pp.77-84
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• 2022

일품등 9품종을 대상으로 경북 남부 평야지역 봄 가뭄 대응 벼 품종별 재배안정성을 평가하기 위해 분얼초기 인위적으로 수분 부족 스트레스를 유도한 결과는 다음과 같다. 1. 일품등 9품종 대상으로 수분 부족 스트레스에 따른 결과는 평균적으로 관행대비 출수기는 약10일 빠르고 쌀수량은 약 18.6% 감소, 담백질 함량은 20.2% 증가, 식미치는 8.3% 감소하였다. 2. 본 연구에서 수량에 가장 영향을 미치는 인자는 2차 지경 분화기에 가장 영향을 받는 영화수와 천립중으로 나타났다. 3. 잎마름이 50%에 도달할때까지 소요일수가 가장 긴 품종은 새누리, 가장 짧은 품종은 대보였다. 4. 재관개 후에도 대보와 삼광은 수량감소가 가장 컸을뿐 아니라 F_V/F_M 관행 초기값으로 회복하지 못하여 가뭄의 광생리학적 지표의 가능성을 확인하였다. 따라서 경북 남부 평야지역에서는 봄 가뭄 대응 내건성 벼 품종은 새누리와 하이아미가 가장 적합하고 내건성이 약한 품종들은 재관개 후에도 광합성 효율이 낮아 수량감소로 이어져 이러한 결과에 따라 관행대비 쌀 수량감소율과 단백질 함량이 낮고 식미치가 높은 품종으로 새누리, 하이아미가 내건성 적합품종으로 선발되었다.

• 한국간호교육학회지
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• 제12권1호
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• pp.43-51
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• 2006

Purpose: This study was performed to identity the relationship between PMS and menstrual attitudes. Method: Data were collected from 417 female college students in Seoul and Gyeonggi-do area during the period from the 6th of September to the 15th of October in 2004. Collected data were analysed using the SPSS WIN 11.0. Result: The results of this study were as follows: 1) Perceived subjective symptoms were clustered endogenous depressive feature($2.76{\pm}.97$), anxiety($2.76{\pm}1.09$), and impulsivity($2.72{\pm}1.02$). 2) PMS was significantly different according to the general characteristics of grade(F=3.414, p=.018), major(F=2.755, P=.004), menarche age(F=5.910, p=.003), pain(F=7.886, p=.000), family history(F=5.366, p=.005). 3) Menstrual attitudes was significantly different according to the general characteristics of grade(F=3.315, p=.020), major(F=3.813, P=.000), religion(F=6.313, p=.000), interval of menstruation(F=2.834, p=.016), pain(F=3.059, p=.048), family history(F=3.062, p=.048). 4) Menstrual attitudes and PMS were in a positive correlation with each other (r=.112, p=.002). Conclusion: This results showed that there is a significant correlation between PMS and menstrual attitudes. For further research, it is recommended to identity major factors affecting PMS and the relationships between them and various subjects.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
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• pp.353-356
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• 2001

The relation between the flocculation and dispersion of metal oxide powders and the properties of solvents, such as dielectric constant and solubility parameter, was investigated for TiO$_2$, $Al_2$O$_3$and Fe$_2$O$_3$particles. The particle size and median diameter of these metal oxides were measured in many organic solvents, from which the effect of solvents on the flocculation and dispersion of metal oxide powders was considered. The metal oxide powders of TiO$_2$, $Al_2$O$_3$and Fe$_2$O$_3$tend to disperse in a solvent of higher polarity, whereas they are apt to flocculate in a solvent of low dielectric constant, because the Hamaker constant between the particles becomes larger in such a solvent. There we, however, some solvents that do not obey these tendencies. It is possible to evaluate the flocculation and dispersion of these metal oxide powders in many solvents by using numeral balances of Hansen’s three-dimensional solubility parameter (f$_{d}$, f$_{p}$ and f$_{h}$). There exists a solvent giving the optimal dispersion for each metal oxide, and the optimal dispersion point of f$_{d}$, f$_{p}$ and f$_{h}$ is determined by the combination of various metal oxide powders and solvents.nts.nts.nts.

• 지역사회간호학회지
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• 제17권1호
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• pp.125-133
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• 2006

Purpose: This study was performed to identify the relationship between PMS and sex role. Method: Data were collected from 417 female college students in Seoul and Gyeonggi-do area during the period from the 6th of September to the 15th of October in 2004. Collected data were analyzed using SPSS WIN 11.0. Result: The results of this study were as follows: 1) Perceived subjective symptoms were clustered endogenous depressive feature ($2.76{\pm}.97$), anxiety ($2.76{\pm}1.09$), and impulsivity ($2.72{\pm}1.02$). 2) PMS was significantly different according to the general characteristics of menarche age (F=5.910, p=.003), pain (F=7.886. p=.000) and family history (F=5.366, p=.005), masculinity was significantly different according to menarche age (F=3.174, p=.043), and femininity was significantly different according to menarche age (F=3.742, p=.025) and pain (F=3.256. p=.040). 3) Femininity and PMS were in a positive correlation with each other (r=.623. p=.000). Conclusion: This results showed that there is a significant correlation between PMS and sex role. For future research, it is recommended to identify major factors affecting PMS and the relationships between them and various subjects.

• Wind and Structures
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• 제37권1호
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• pp.57-78
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• 2023

In this study, a generalized three-degree-of-freedom (3-DoF) analytical model is formulated to predict linear aerodynamic instabilities of a prism under quasi-steady (QS) conditions. The prism is assumed to possess a generic cross-section exposed to turbulent wind flow. The 3-DoFs encompass two orthogonal horizontal directions and rotation about the prism body axis. Inertial coupling is considered to account for the non-coincidence of the mass center and the rotation center. The aerodynamic force coefficients-drag, lift, and moment-depend on the Reynolds number based on relative flow velocity, angle of attack, and the angle between the wind and the cable. Aerodynamic forces are linearized with respect to the static equilibrium configuration and mean wind velocity. Routh-Hurwitz and Liénard and Chipart criteria are used in the eigenvalue problem, yielding an analytical solution for instabilities in galloping and static divergence types. Additionally, the minimum structural damping and stiffness required to prevent these instabilities are numerically determined. The proposed 3-DoF instability model is subsequently applied to a conductor with ice accretion and a full-scale dry inclined cable. In comparison to existing models, the developed model demonstrates superior prediction accuracy for unstable regions compared with results in wind tunnel tests.

• 방사선산업학회지
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• 제17권3호
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• pp.233-238
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• 2023

This study was conducted to confirm the safety of the operator's radiation exposure in the micro PET-CT image acquisition experiment using the ¹⁸F-FDG. The usage of ¹⁸F-FDG and the exposure dose of handlers were measured at University B in Metropolitan City A, which uses ¹⁸F-FDG for micro PET-CT image acquisition. As a result of the measurement, the exposure dose is far below the effective dose limit of radiation workers, 50 mSv per year, and the equivalent dose limit of 500 mSv per year for hands, feet, and skin. has been measured Since these exposure doses can be further increased according to the number of times of use of ¹⁸F-FDG, it is judged that the exposure dose compared to the handling amount of ¹⁸F-FDG shown in this study can be used as reference data. In addition, as changed environments such as the use of materials other than unopened RI are occurring in education and research environments, such as the use of ¹⁸F-FDG at University B, radiation exposure with more interest in safety management by checking the factors of radiation exposure of the handler concerned We will always do our best to reduce it.

• 한국산학기술학회논문지
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• 제11권6호
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• pp.2185-2189
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• 2010

본 연구는 병원 직원들의 건강증진 실천과 관련된 요인들을 규명하기 위해 시도하였다. 자료는 2010년 1월 11일부터 2월 11일까지 서울에 소재한 2개의 종합병원에 근무하고 있는 병원 직원 204명을 대상으로 설문조사를 실시하였다. 연구결과 첫째, 건강증진의 실천정도에 따른 자기효능감은 스트레스정도가 낮은 그룹 3.71점에서의 자기효능감이 높은 그룹 2.64점보다 유의하게 높게 나타났다(F=3.802, p=0.026). 둘째, 건강증진 실천에 따른 사회적 지지는 운동을 하는 그룹에서 인지하는 사회적 지지의 정도가 운동을 하지 않는 그룹에서의 사회적 지지보다 유의하게 높았다(F=3.496, p=0.048). 셋째, 자기효능감과 사회적 지지는 유의한 양의 상관관계를 보였다(r=0.591, p<0.001). 결론적으로 병원 직원들의 건강증진실천 향상을 위한 적극적인 자가관리 프로그램 개발 및 적용이 필요하다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 추계학술대회
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• pp.1482-1487
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• 2003

This paper presents a new family of 4-DoF parallel mechanism with two platforms. The new mechanism is composed of front and rear platforms, and three limbs. Two limbs with 6dof joint (P-P-S-P) are attached to the each platform and are perpendicular to baseplate, while the middle limb with 4-Dof joints (R-R-R-P or R-R-P-P) is attached to the revolute joint that connect front and rear platform. The two-DoF-driving mechanism at the middle limb with two base-fixed prismatic actuators can generate the heaving and roll motions or two translational motions. Therefore, Therefore, the new 4-Dof parallel mechanism (1T-3R) can generate pitch motions at each platforms, roll, and heaving motions, while another type of new 4-Dof parallel mechanism (2T-2R) can generate pitch motions at each platforms, x and z translational motions. For 1T-3R mechanism, kinematic analyses including inverse, forward kinematics, and Jacobian are performed.