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Hyein Lee,Seon Woo Park,Minh Duy Pham,Hyunseung Hwang,Changhoo Chun 한국원예학회 2020 Horticulture, Environment, and Biotechnology Vol.61 No.6
The application of plant factory with artifi cial lighting (PFAL) for producing strawberry transplants (S-PFAL) was recentlyintroduced due to the capacity for high quality and year-round transplant production. To achieve greater effi ciency with thissystem, it is essential to select lighting sources that have a suitable spectrum for runner plant propagation. This study wasconducted to investigate the eff ects of the light spectrum of white light-emitting diodes (LEDs), which have a diff erent correlatedcolor temperature compared with that of white fl uorescent lamps, on the growth of strawberry ( Fragaria × ananassaDuch. cv. Maehyang) propagules and runner plants in a PFAL. Uniform propagules with one fi xed runner each were placedinto a PFAL for transplant production and were grown under either warm-white LEDs (WWL), mint-white LEDs (MWL),or cool-white fl uorescent lamps (CWF) for 21 days. The propagules in the MWL treatment group had the greatest numberof leaves, leaf area, top/root dry weight ratio and number of newly formed runners per propagule among the treatments. Thedry weight of the newly formed runners of each propagule was also greatest after MWL treatment, whereas it was lowestafter CWF treatment. However, there was no signifi cant diff erence in the growth parameters of the runner plants amongthe three treatments. The photosynthetic photon effi cacy of WWL and MWL was 5.40 μmol s − 1 W − 1 , which was 62.6%higher than that of CWF (3.38 μmol s − 1 W − 1 ). The dry weight effi cacies of the MWL, WWL, and CWF treatments were23.5, 22.1, and 10.0 g kWh − 1 , respectively. These results indicate that MWL with high photosynthetic photon effi cacy canhave positive eff ects on the runner formation and growth of strawberry propagules and can replace cool-white fl uorescentlamps in an S-PFAL.
( Hyein Kim ),( Seul Ki Kim ),( Chang-woo Choo ),( Jung Ryeol Lee ),( Byung Chul Jee ),( Won Don Lee ),( Seok Hyun Kim ) 대한산부인과학회 2018 대한산부인과학회 학술대회 Vol.104 No.-
Objective: To investigate the recognition and knowledge about oocyte freezing for social or medical reasons among unmarried women of reproductive age in Korea. Methods: This was a survey study performed at a single center between December 2016 and May 2018. Women of reproductive age (20-45 years) who had no partner at the time of recruitment were included. The 30-item questionnaire consisted of following parts: (1) demographics; (2) awareness of pregnancy and childbirth; (3) recognition about oocyte freezing and factors that affect a woman's decision-making in the utilization of fertility preservation; and (4) knowledge about oocyte freezing. Results: 86 women received an electrical survey and 15 were excluded as they were incomplete. Mean age was 37.0 years. Over half of the women (73%) responded they decided to undergo oocyte freezing for their fertility preservation. Most frequently reported reason for the decision was to maintain their fertility in the future when they attempt pregnancy (70.6%). Most of the respondents (61.8%) expressed positive intent for oocyte donation. In the evaluation of background knowledge about fertility, most respondents got only 1 question correct out of the 6. Most respondents thought that costs for the procedure should be covered by medical insurance or social security system. They expected proper medical advice about fertility preservation when they met health care providers. Conclusion: Interest in the preservation of freezing eggs has increased and the number of procedures is increasing in Korea, but it has not been universal yet. Reinforcement in governmental and institutional support is essential to meet the demand of women who want to preserve their fertility. This could be one of the solutions to the low fertility crisis in Korea.
Development of a compact optical torque sensor with decoupling axial-interference effects for pHRI
Lee, Hyein,Kim, Sangjoon J.,Chang, Handdeut,Kim, Jung Elsevier 2018 Mechatronics Vol.52 No.-
<P>This paper presents the design of an optical torque sensor that can structurally decouple the effect of axial-interference for use in various robotics applications. Torque sensors are widely used in the joints of intelligent service or wearable robots to realize safe human-robot interaction. Whole robot body sensing using torque sensors is essential for safe interaction. However, most torque sensors are bulky, heavy and expensive. Therefore, many optical-based torque sensors have been proposed to deal with such problems, but the issue of axial-interference still remains. We resolved the axial-interference problem via the geometrical structure of the sensor body and differential signaling using two reflective optical sensors. The moment interference error was successfully decreased from 4.49% (with one optical sensor) to 0.11% (with two optical sensors) using the proposed sensor structure while maintaining a compact size, lightweight, and low cost. Static tests and dynamic tests were carried out and analyzed for accuracy error, hysteresis, and repeatability. We then compared the performance of an impedance controller that is widely used in service and wearable robots using the proposed sensor and a commercial torque sensor with respect to various control loop rates. The control performance of the proposed sensor was comparable to that of commercial sensors.</P>
Lee, Hyein,Kim, Young Jun,Sohn, Youngku,Rhee, Choong Kyun The Korean Electrochemical Society 2021 Journal of electrochemical science and technology Vol.12 No.3
This work presents a contrasting behavior of formic acid oxidation (FAO) on the Pt and Bi deposits on different Pt substrates. Using irreversible adsorption method, Bi and Pt were sequentially deposited on Pt electrodes of nanoparticle (Pt NP) and disk (Pt disk). The deposited layers of Bi and Pt on the Pt substrates were characterized with X-ray photoelectron spectroscopy, transmission microscopy and scanning tunneling microscopy. The electrochemical behaviors and FAO enhancements of Pt NP and Pt disk with deposited Bi only (i.e., Bi/Pt NP and Bi/Pt disk), were similar to each other. However, additional deposition of Pt on Bi/Pt NP and Bi/Pt disk (i.e., Pt/Bi/Pt NP and Pt/Bi/Pt disk) changed the electrochemical behavior and FAO activity in different ways depending on the shapes of the Pt substrates. With Pt/Bi/Pt NP, the hydrogen adsorption was suppressed and the surface oxidation of Pt was enhanced; while with Pt/Bi/Pt disk, the opposite behavior was observed. This difference was interpreted as a stronger interaction between the deposited Bi and Pt on Pt NP than that on Pt disk. The FAO performance on Pt/Bi/Pt NP is much better than that on Pt/Bi/Pt disk, most likely due to the difference in the interaction between the deposited Pt and Bi depending on the shapes of Pt substrates. In designing FAO electrochemical catalysts using Pt and Bi, the shape of a Pt substrate was concluded to be critically considered.