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A Study on the Strategy for Responding to Large-Scale Complex Disasters
Dongkwan Lee J-INSTITUTE 2023 International Journal of Human & Disaster Vol.8 No.-
Purpose: A large-scale complex disaster refers to a disaster that develops on a huge scale outside the predictable range as natural disasters and social disasters occur serially or simultaneously. The local community must take into account the diversity of residents' situations and organize an evacuation cooperation system in advance in order to respond to such large-scale, complex disasters. The purpose of this paper is to present a direction for improving community response to disasters through a review of large-scale complex disasters. Method: This study examines the large-scale flood damage evacuation plan in the 5th district of Koto, Tokyo, Japan, which established an evacuation plan led by the local community after the Great East Japan Earthquake. Evacuation was divided into vertical evacuation, evacuating within the community, and wide area evacuation, evacuating outside the community. Results: The main features of these evacuation plans were that they encouraged local residents to make independent judgements, to implement the plans, and to proactively request and prepare for administrative support for the parts that were insufficient. Conclusion: First of all, for efficient evacuation from large-scale-complex disasters, various stakeholders need to be recognized and systematically organize, and cooperation with relevant and upper-level administrative agencies is needed to solve problems that are beyond the capacity of local governments. It is also necessary for residents to recognize their own role in disaster response along with the proper implementation of disaster prevention administration, and for the administration to support factors that residents cannot do as much as possible, as the basic structure of the crisis.
Dongkwan Lee,Changik Lee,Byung-Chul Son 대한신경손상학회 2022 Korean Journal of Neurotrauma Vol.18 No.2
The subclavius posticus muscle is a rare aberrant muscle that traverses from the costal cartilage of the first rib posterolaterally to the superior border of the scapula. We report a patient having persistent paralysis of shoulder abduction with wrist and finger extension after a humeral neck fracture. Electromyography (EMG) examination revealed injuries to several upper extremity peripheral nerves, including the radial, axillary, and musculocutaneous nerves. Magnetic resonance imaging (MRI) performed at 10 months post-injury showed severe entrapment of the left brachial plexus by the subclavius posticus muscle at the thoracic outlet. The diagnosis of brachial plexus injury due to a rare abnormal subclavius posticus muscle was typically delayed until the MRI was performed for unexplained multiple peripheral nerve palsy. Resection of the aberrant muscle and brachial plexus decompression did not yield significant improvement in the patient’s radial nerve palsy until 6 months after surgery. Entrapment of the brachial plexus caused by the subclavius posticus muscle can cause symptoms of acute thoracic outlet syndrome following trauma to the upper extremity. In a case of inexplicable multiple peripheral nerve injuries in the upper extremity that are not proportional to the degree of trauma, MRI imaging along with EMG is required.
Shin, Dongkwan,Kim, Ik Soo,Lee, Ji Min,Shin, Sung-Young,Lee, Jong-Hoon,Baek, Sung Hee,Cho, Kwang-Hyun Oxford University Press 2014 Journal of molecular cell biology Vol.6 No.4
<P>Prostaglandin E2 (PGE(2)) is known to have a key role in the development of colorectal cancer, but previous experiments showed its contrasting (i.e. tumor-promoting or tumor-suppressive) roles depending on experimental conditions. To elucidate the mechanisms underlying such contrasting roles of PGE(2) in tumorigenesis, we investigated all the previous experiments and found a new signal transduction pathway mediated by retinoic acid receptor-related orphan receptor (ROR)alpha, in which PGE(2)/PKC alpha-dependent phosphorylation of ROR alpha attenuates Wnt target gene expression in colon cancer cells. From mathematical simulations combined with biochemical experimentation, we revealed that ROR alpha induces a biphasic response of Wnt target genes to PGE(2) stimulation through a regulatory switch formed by an incoherent feedforward loop, which provides a mechanistic explanation on the contrasting roles of PGE(2) observed in previous experiments. More interestingly, we found that ROR alpha constitutes another regulatory switch formed by coupled positive and negative feedback loops, which regulates the hysteretic response of Wnt signaling and eventually converts a proliferative cellular state into an anti-proliferative state in a very delicate way. Our results indicate that ROR alpha is the key regulator at the center of these hidden switches that critically regulate cancer cell proliferation and thereby being a promising anti-cancer therapeutic target.</P>
Stretchable Skin-Like Cooling/Heating Device for Artificial Thermal Sensation
Munju Kim,Jinwoo Lee,Heayoun Sul,Wonha Lee,Kyun Rok Pyun,Inho Ha,Dongkwan Kim,Hyojoon Park,Hyeonjin Eom,Yeosang Yoon,Jinwook Jung,Doungjun Lee,Seunghwan Ko 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.5
Artificial reproduction of accurate/controllable thermal sensation to haptic signal is required to construct a more realistic virtual reality(VR) environment. In this study, a skin-like, highly soft and stretchable bi-functional thermo-haptic device is reported with a single device structure. The skin-like thermo-haptic(STH) device can actively cool down and heat up its deformable surface to mimic desirable thermal sensation. This new type of STH device is expected to offer potential implications to provide valuable thermal information for VR technology and medical thermal treatment.
Efficiency Optimization of a Two-stage Microinverter with Grid Support functions
Dongkwan Yoon,Jaehyeok Jang,Inwon Lee,Younghoon Cho 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
This paper describes the efficiency optimization of a grid supporting two-stage microinverters consisting of an LLC converter and a full-bridge inverter. Multiple combinations of switching devices and magnetics are compared to maximize the California energy commission (CEC) efficiency. The numerical loss breakdowns of each component are performed, and the simulations are supplemented to confirm the results. To verify the design strategy in this paper, a 400W microinverter is built and tested. Both the simulation and the experiments on the microinverter validate the effectiveness of the optimization strategy presented in this paper.
Novel Hierarchical Test Architecture for SOC Test Methodology Using IEEE Test Standards
Dongkwan Han,Yong Lee,Sungho Kang 대한전자공학회 2012 Journal of semiconductor technology and science Vol.12 No.3
Abstract?SOC test methodology in ultra deep submicron (UDSM) technology with reasonable test time and cost has begun to satisfy high quality and reliability of the product. A novel hierarchical test architecture using IEEE standard 1149.1, 1149.7 and 1500 compliant facilities is proposed for the purpose of supporting flexible test environment to ensure SOC test methodology. Each embedded core in a systemon-a-chip (SOC) is controlled by test access ports (TAP) and TAP controller of IEEE standard 1149.1 as well as tested using IEEE standard 1500. An SOC device including TAPed cores is hierarchically organized by IEEE standard 1149.7 in wafer and chip level. As a result, it is possible to select/deselect all cores embedded in an SOC flexibly and reduce test cost dramatically using star scan topology.