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A New Multi-site Test for System-on-Chip Using Multi-site Star Test Architecture
Dongkwan Han,강성호 한국전자통신연구원 2014 ETRI Journal Vol.36 No.2
As the system-on-chip (SoC) design becomes morecomplex, the test costs are increasing. One of the mainobstacles of a test cost reduction is the limited number oftest channels of the ATE while the number of pins in thedesign increases. To overcome this problem, a new testarchitecture using a channel sharing compliant with IEEEStandard 1149.1 and 1500 is proposed. It can significantlyreduce the pin count for testing a SoC design. The testinput data is transmitted using a test access mechanismcomposed of only input pins. A single test data output pinis used to measure the sink values. The experimentalresults show that the proposed architecture not onlyincreases the number of sites to be tested simultaneously,but also reduces the test time. In addition, the yield lossowing to the proven contact problems can be reduced. Using the new architecture, it is possible to achieve a largetest time and cost reduction for complex SoC designs withnegligible design and test overheads.
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.
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.
Evaporation of Water in an Aqueous Lithium Bromide Solution flowing over a Horizontal Tube
Dongkwan Kim,Moohwan Kim 대한설비공학회 2001 International Journal Of Air-Conditioning and Refr Vol.9 No.3
Falling film heat transfer analyses with aqueous lithium bromide solution were performed to investigate the transfer characteristics of the copper tubes. Finned (knurled) tube and a smooth tube were selected as test specimens. Averaged generation fluxes of water and the heat flux were obtained. As the film flow rate of the solution increased, the generation fluxes of water increased for both tubes due to the fact that the heat transfer resistance increased with the film thickness. The effect of the enlarged surface area at the knurled tube was supposed to be dominant at a small flow rate. The generation fluxes of water increased with the increasing degree of tube wall superheat. Nucleate boiling is supposed to occur at a wall superheat of 20 K for a smooth tube, and at 10 K for a knurled tube. The increased performance of the knurled tube was supposed to mainly come from the effect of the increased heating surface area.
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.