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Implementation of Neuromorphic System with Si-based Floating-body Synaptic Transistors
Park, Jungjin,Kim, Hyungjin,Kwon, Min-Woo,Hwang, Sungmin,Baek, Myung-Hyun,Lee, Jeong-Jun,Jang, Taejin,Park, Byung-Gook The Institute of Electronics and Information Engin 2017 Journal of semiconductor technology and science Vol.17 No.2
We have developed the neuromorphic system that can work with the four-terminal Si-based synaptic devices and verified the operation of the system using simulation tool and printed-circuit-board (PCB). The symmetrical current mirrors connected to the n-channel and p-channel synaptic devices constitute the synaptic integration part to express the excitation and the inhibition mechanism of neurons, respectively. The number and the weight of the synaptic devices affect the amount of the current reproduced from the current mirror. The double-stage inverters controlling delay time and the NMOS with large threshold voltage ($V_T$) constitute the action-potential generation part. The generated action-potential is transmitted to next neuron and simultaneously returned to the back gate of the synaptic device for changing its weight based on spike-timing-dependent-plasticity (STDP).
Park, Jungjin,Moon, Joonhee,Kim, Chunjoong,Kang, Jin Hyoun,Lim, Eunhak,Park, Jaesung,Lee, Kyung Jae,Yu, Seung-Ho,Seo, Jung-Hye,Lee, Jouhahn,Heo, Jiyoung,Tanaka, Nobuo,Cho, Sung-Pyo,Pyun, Jeffrey,Caban Nature Publishing Group 2016 NPG Asia Materials Vol.8 No.-
<P>Lithium-sulfur (Li-S) batteries are expected to overcome the limit of current energy storage devices by delivering high specific energy with low material cost. However, the potential of Li-S batteries has not yet been realized because of several technical barriers. Poor electrochemical performance is mainly attributed to the low electrical conductivity of the fully charged and discharged species, the irreversible loss of polysulfide anions and the decrease in the number of electrochemically active reaction sites during battery operation. Here, we report that the introduction of graphene quantum dots (GQDs) into the sulfur cathode dramatically enhanced sulfur/sulfide utilization, yielding high performance. In addition, the GQDs induced structural integrity of the sulfur-carbon electrode composite by oxygen-rich functional groups. This hierarchical architecture enabled fast charge transfer while minimizing the loss of lithium polysulfides, which is attributed to the physicochemical properties of GQDs. The mechanisms through which excellent cycling and rate performance are achieved were thoroughly studied by analyzing capacity versus voltage profiles. Furthermore, experimental observations and theoretical calculations further clarified the role played by GQDs by proving that C-S bonding occurs. Thus, the introduction of GQDs into Li-S batteries will provide an important breakthrough allowing their use as high-performance and low-cost batteries for next-generation energy storage systems.</P>
Implementation of Neuromorphic System with Si-based Floating-body Synaptic Transistors
Jungjin Park,Hyungjin Kim,Min-Woo Kwon,Sungmin Hwang,Myung-Hyun Baek,Jeong-Jun Lee,Taejin Jang,Byung-Gook Park 대한전자공학회 2017 Journal of semiconductor technology and science Vol.17 No.2
We have developed the neuromorphic system that can work with the four-terminal Si-based synaptic devices and verified the operation of the system using simulation tool and printed-circuit-board (PCB). The symmetrical current mirrors connected to the n-channel and p-channel synaptic devices constitute the synaptic integration part to express the excitation and the inhibition mechanism of neurons, respectively. The number and the weight of the synaptic devices affect the amount of the current reproduced from the current mirror. The double-stage inverters controlling delay time and the NMOS with large threshold voltage (VT) constitute the action-potential generation part. The generated action-potential is transmitted to next neuron and simultaneously returned to the back gate of the synaptic device for changing its weight based on spike-timing-dependent-plasticity (STDP).
Neuromorphic System Based on CMOS Inverters and Si-Based Synaptic Device
Park, Jungjin,Kwon, Min-Woo,Kim, Hyungjin,Park, Byung-Gook American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.5
<P>We developed an analog neuron circuit that can work with Si-based synaptic devices. N-channel and p-channel synaptic devices connected to current mirrors constitute the synaptic connection and integration parts to implement the excitation and inhibition mechanisms of biological neurons. The normal inverter controlling delay time and the modified inverter making negative pulse constitute the action-potential generation part to generate output action-potential. Connecting output potential to the synaptic device, we implement the spike-timing-dependent-plasticity (STOP) mechanism, adjusting the conductance of synapse. As we have constituted the analog neuron circuit using 4-terminal synaptic device without additional switch and logic operation, we can emulate the operation of the neuron with minimum number of devices and power dissipation.</P>
Building Intelligent User Interface Agent for Semantically Reformulating User Query in Medicine
JungJin Yang,ChaeMyung Lim,SungJoon Chu,DongHoon Lee,DuckWhan Park,TaeYong Park 한국지능정보시스템학회 2003 지능정보연구 Vol.9 No.2
Achieving the beneficiary goal of recent discovery in human genome project still needs a way to retrieve and analyze the exponentially expanding bio-related information. Research on bio-related fields naturally applies knowledge discovered to the current problem and make inferences to extract new information where shared concepts and data containing information need to be defined and used in a coherent way. In such a professional domain, while the need to help users reduce their work and to improve search results has been emerged, methods for systematic retrieval and adequate exchange of relevant information are still in their infancy. The design of our system aims at improving the quality of information retrieval in a professional domain by utilizing both corpus-based and concept-based ontology. Meta-rules of helping users to make an adequate query are formed into an ontology in the domain. The integration of those knowledge permits the system to retrieve relevant information in a more semantic and systematic fashion. This work mainly describes the query models with details of GUI and a secondary query generation of the system.<br/>
構造変動期の日朝関係と韓国-南北関係との因果性に注目 しながら
Park, Jungjin Korea Consensus Institute(KCI) 2018 Analyses & alternatives Vol.2 No.1
This paper aims to elucidate the historical significance and issues about DPRK-Japan relations in terms of the Korean Peninsula-Japan relations. The first issue is the 'Treaty on Basic Relations between Japan and the Republic of Korea', and DPRK-Japan relations during the Cold War. The Relations Order between the Korean Peninsula and Japan, of 1965 ("65 Order), was closely linked with inter-Korean relations. The second issue is a critical re-interpretation of previous studies on the Stockholm agreement. Previous studies have focused on analyzing the question "Why did North Korea and Japan agree to Stockholm?", In other words, what was the intention of North Korea and Japan in Stockholm? This paper adds to raise the question of "How Did the Stockholm can be agreed?", to critically review the analysis performed by the previous studies. Through the analysis of this question, this paper reveals that the relationship between North Korea and Japan is on the qualitative change. And, based on this analysis, this paper argue that the South Korean government should attempt more active engagement and deploy more comprehensive approach to improve the relationship between North Korea and Japan.
SECURITY ENHANCEMENT AUTOMATION TECHNOLOGY OF THE WINDOWS SYSTEM BASED ON POLICY
Jungjin Park,Jinsub Park,Youngsun Shin,Heesung Lee 한국멀티미디어학회 2007 한국멀티미디어학회 국제학술대회 Vol.2007 No.-
The use of Internet is increasing recently and the damage caused by hacking, internet worms or virus is spreading. We are operating computer vaccine(Anti-Virus) and all sorts of security equipment for blocking hacking and malignant programs but it doesn't fundamentally solve the cause. In this paper, it automatically controls a security set of Windows Operating System setup and the vulnerability which becomes the basic cause of hacking and malignant programs. The security set of Windows Operating System is set by the policy of a manager and the policy which is set is automatically applied in target windows systems. In this paper, it proposes the technology the manager of a center will be able to control the security function of Windows Operating System.