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134 results on '"Lee, Joohyeong"'

2. Influence of international industrial transfer on the structural power of global value chain -Empirical evidence from manufacturing in RCEP Countries.

Author

Yu Zhang, Lee Joohyeong, Minjian Qiao, and Minglong Kou

Subjects
Medicine, Science
Abstract

International industrial transfer (IIT) has spawned changes in the deep-seated structural power of value-added. We creatively construct an IIT index which includes both scale and direction, and constructs the structural power (SP) of value-added based on added value. Furthermore, based on 15 RECP countries from 1995 to 2018, this study uses a two-fixed-effect regression model to investigate the IIT on the structural power of value-added of RCEP countries. The results show that: (1) IIT can significantly promote the structural power of value-added of RCEP countries, and the benchmark regression conclusion is still valid after a series of robustness tests; (2) Heterogeneity analysis shows that IIT has a more significant promoting effect on the structural power of value-added in developed countries than in developing countries and a more significant promoting effect on the structural power of value-added inward than on the structural power of value-added outward; (3) Intermediary mechanism test shows that IIT mainly affects the structural power of value-added through trade openness and foreign direct investment. The conclusions of this paper provide useful enlightenment for enhancing the structural power of manufacturing value-added in RCEP countries in the context of global value chain division.

Published
2024
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8. Effects of MnTBAP on Porcine Semen Cryopreservation and Capacitation.

Author

Kim, Eunji, Yu, Il-Jeoung, Lee, Joohyeong, and Jeon, Yubyeol

Subjects
FROZEN semen, SPERMATOZOA, CELL physiology, CELL anatomy, REACTIVE oxygen species, MEMBRANE potential
Abstract

Antioxidants protect cellular function and structure by neutralizing the oxidative stress caused by increased reactive oxygen species (ROS) during sperm freezing. Studies on cryopreservation using various antioxidants have demonstrated encouraging results. Many studies have used antioxidants to increase the efficiency of sperm freezing and to improve the success rate of artificial insemination and pregnancy. Manganese (III) tetrakis (4-benzoic acid) porphyrin chloride (MnTBAP) is a newly synthesized antioxidant with positive effects on sperm morphology and capacitation in humans, rams, and stallions. In this study, porcine semen was treated with 0, 50, 100, and 150 μM of MnTBAP based on a Tris–egg-yolk extender and frozen to determine whether MnTBAP can assist the status of sperm during cryopreservation. First, motility was assessed using the computer-assisted sperm analysis (CASA) system, with the 100 μM treatment group showing the highest motile rate (66.8%) compared with that of the other groups (control, 51.1%; 50 μM and 150 μM, 59.6%); therefore, the remaining analyses were conducted comparing the two groups (control vs. 100 μM group; p < 0.01). Second, fluorescence staining was applied to examine the control and 100 μM groups using fluorescence microscopy. The viability (41.7% vs. 62.4%) and the acrosome integrity (77.9% vs. 86.4%) differed significantly (p < 0.05). In addition, the mitochondrial membrane potential (MMP) was 46.5% vs. 51.9%; the fragmentation rate, estimated using the Sperm-sus-Halomax kit, was 63.4% vs. 57.4%; and the detected caspase activity was 30.1% vs. 22.9%. These tended to be higher in the treated group but did not differ significantly. Third, measurements using FACSLyric revealed that the 100 μM treatment group exhibited a state of elevated normal lipid arrangement within the plasma membrane and diminished levels of apoptosis and ROS (p < 0.01). We assessed the expression of genes relevant to antioxidant effectiveness using real-time RT-qPCR. Our findings indicated significant alterations in the expression levels of various mRNA species, with the exception of NOX5 (p < 0.05). Finally, the straws were dissolved and used to treat matured denuded oocytes to investigate the effect on fertilization and embryo development in vitro. The cleavage rate was (77.6% vs. 84.1%), and the blastocyst rate was 9.7% vs. 11.4% (p < 0.05). In conclusion, these results suggest that MnTBAP positively affected sperm freeze–thawing, improving the fertilization capacity, and leading to increased embryo development. [ABSTRACT FROM AUTHOR]

Published
2024
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9. Human-Machine Interface System for Motorcyclists: Quantification of Total Reliability as Human-Machine System

Author

Lee, Joohyeong, Ozaki, Ikumi, Kishino, Saya, Suzuki, Keisuke, Nakajima, Masumi, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, and Stanton, Neville, editor

Published
2019
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15. The effect of C–C motif chemokine ligand 2 supplementation on in vitro maturation of porcine cumulus-oocyte complexes and subsequent developmental competence after parthenogenetic activation

Author

Kim, Sohee, primary, Oh, Dongjin, additional, Choi, Hyerin, additional, Kim, Mirae, additional, Cai, Lian, additional, Jawad, Ali, additional, Haomiao, Zheng, additional, Lee, Joohyeong, additional, Kim, Eunhye, additional, and Hyun, Sang-Hwan, additional

Published
2023
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19. Systemic TM4SF5 overexpression in ApcMin/+ mice promotes hepatic portal hypertension associated with fibrosis

Author

Lee, Joohyeong, primary, Kim, Eunmi, additional, Kang, Min-Kyung, additional, Ryu, Jihye, additional, Kim, Ji Eon, additional, Shin, Eun-Ae, additional, Pinanga, Yangie, additional, Pyo, Kyung-hee, additional, Lee, Haesong, additional, Lee, Eun Hae, additional, Cho, Heejin, additional, Cheon, Jayeon, additional, Kim, Wonsik, additional, Jho, Eek-Hoon, additional, Kim, Semi, additional, and Lee, Jung Weon, additional

Published
2022
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28. Beneficial Effects of Neurotrophin-4 Supplementation During in vitro Maturation of Porcine Cumulus-Oocyte Complexes and Subsequent Embryonic Development After Parthenogenetic Activation

Author

Kim, Mirae, primary, Hwang, Seon-Ung, additional, Yoon, Junchul David, additional, Lee, Joohyeong, additional, Kim, Eunhye, additional, Cai, Lian, additional, Kim, Gahye, additional, Choi, Hyerin, additional, Oh, Dongjin, additional, and Hyun, Sang-Hwan, additional

Published
2021
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37. Evaluation of accident avoidance supporting system at intersections for motorcyclists using ADAS

Author

Lee, JooHyeong, Ozaki, Ikumi, Suzuki, Keisuke, and Nakajima, Masumi

Subjects
Inbäddad systemteknik, Embedded Systems
Abstract

Recently in the world, Technologies using V2I(Vehicle-to-Infrastructure), V2V(Vehicle-to-Vehicle), etc. based on ICT(Information and Communication Technologies) are being developed as a system for driving safety. Those systems are designed to prevent traffic accidents by connecting all things using the internet, such as vehicles to vehicles, vehicles to peoples, vehicles to roads. In Japan, traffic systems using IT(Information Technology) are being developed as ITS(Intelligent Transport Systems). To prevent traffic accidents, autonomous control systems such as CMBS(Collision Mitigation Brake System), LKA(Lane Keeping Assist system), and ACC(Adaptive Cruise Control system) are being put to practical use in the market. However, the development of accident prevention systems for motorcycles with high traffic accident rates and high mortality rates is not active. In this paper, we propose and evaluate an HMI(Human Machine Interface) system that presents visual and auditory information as simple information to prevent traffic accidents by using ITS. This study was carried out on the assumption that the system provides an intuitive notification to the riders for the assistance in decelerating and stopping when their dangerous situations that could not be detected during riding. Therefore, the system should present information at the right time according to the situation. As a research method, we investigated the driving behavior of 30 male subjects in their 20's using a riding simulator applied the accident avoidance supporting system. And it used the scenarios involving scenarios #1 and #2, dummy scenarios, and malfunction scenario. And evaluated the effectiveness of the system through the results of critical parameters and accident probability. As a result, the brake reaction time and average deceleration decreased when using the system, and it is possible to stop the vehicle more safely. We evaluated the system is effective from reduced accident probability when using the system. This system was designed to prevent intersection accidents. Those accidents represent more than 70% of the motorcycle accident rate in Japan.

Published
2018

43. HMI Design when Using Level 2 Automated Driving Function - Effects of System Status Presentation Considering the Risk of Malfunction on Driver Behavior –.

Author

Suzuki, Keisuke, Lee, Joohyeong, and Kanbe, Atsushi

Subjects
*AUTOMOBILE drivers, *AUTOMOBILE driving, *TRAFFIC accidents, *PROBABILISTIC databases, *TRAFFIC safety
Abstract

This study examined the effect of system status presentation on driver behavior when driving with ACC and LKA, which are classified as level 2 automated driving. First, we analyzed the driving behavior of 40 test participants in a driving simulator study under three HMI conditions: without safety level, correct safety level, and incorrect safety level which does not work properly and becomes inactive. The driver behavior database constructed in this experiment, was used to quantify the accident avoidance probability under each HMI condition using the state transition probabilistic model proposed by the author in a previous study. Finally, we quantified the degree of reduction in the probability of accident occurrence when using this HMI device in consideration of the risk of malfunction based on the integrated error model proposed by the author. Based on these results, it was shown that the HMI device that acts as a real-time interface at the system safety level between the driver and the automated driving using ACC and LKA is effective in reducing traffic accidents regardless of the increased probability of traffic accidents due to malfunctions of HMI device. [ABSTRACT FROM AUTHOR]

Published
2020
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