Implementation of Novel GDI D-Flip-Flop for RTL Design

Seungmin Jung 한국정보과학회 2023 Journal of Computing Science and Engineering Vol.17 No.4

In this paper, we proposed a small area hybrid D-flip-flop (DFF) circuit based on the gate diffusion input (GDI) technique. The proposed circuit consisted of only 12 MOS transistors compared to CMOS. This circuit was designed to be applied to a standard cell library used for register transfer level (RTL) flow. To compare with CMOS, circuit characteristics were verified through simulation and layout using 1.8 V 180n standard CMOS process parameters. The proposed GDI DFF cell reduced the layout area by less than half while maintaining delay and power compared to CMOS. Characteristics of the implemented circuit are discussed, and simulation results are reported.

Trajectory generation algorithm for smooth movement of a hybrid-type robot Rocker-Pillar

Seungmin Jung,Dongkyu Choi,김화수,김종원 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.11

While traveling on rough terrain, smooth movement of a mobile robot plays an important role in carrying out the given tasks successfully. This paper describes the trajectory generation algorithm for smooth movement of hybrid-type mobile robot Rocker-Pillar by adjusting the angular velocity of its caterpillar as well as each wheel velocity in such a manner to minimize a proper index for smoothness. To this end, a new Smoothness index (SI) is first suggested to evaluate the smoothness of movement of Rocker-Pillar. Then, the trajectory generation algorithm is proposed to reduce the undesired oscillations of its Center of mass (CoM). The experiment are performed to examine the movement of Rocker-Pillar climbing up the step whose height is twice larger than its wheel radius. It is verified that the resulting SI is improved by more than 40% so that the movement of Rocker-Pillar becomes much smoother by the proposed trajectory algorithm.

A Study on Peak Power Reduction using Regenerative Energy in Railway Systems through DC Subsystem Interconnection

Jung, Seungmin,Lee, Hansang,Kim, Kisuk,Jung, Hosung,Kim, Hyungchul,Jang, Gilsoo The Korean Institute of Electrical Engineers 2013 Journal of Electrical Engineering & Technology Vol.8 No.5

Owing to the consistent increase in energy efficiency issues, studies for improving regenerative energy utilization have been receiving attention in the Urban DC railway systems, where currently, the utilization of regenerative energy is low due to the lack of a specific plan for using this energy. The regenerative energy in railway systems has a low efficiency problem which results in the increase of the catenary voltage and a possibility to create problems to the electrical devices connected to the system. This paper deals with the power integration of large urban railway subsystems to improve regenerative energy utilization where the railway subsystems are integrated with other railway subsystems to improve the energy efficiency. Through the case studies, to find the realistic effect of integrated operation, the Seoul Metro subsystems, namely Line 5 and Line 7, has been applied. Also, evaluation for the electricity cost saving has been performed by using KEPCO electricity cost table.

A VLSI Implementation of High Sensitive Fingerprint Sensor using Parasitic Insensitive Charge Transfer Circuit

Seungmin Jung 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.7

This paper implements 80x64 array high sensitive fingerprint sensor with the parasitic insensitive charge transfer circuit. The fingerprint sensor cell uses an active output voltage feedback integrator. The parasitic insensitive charge transfer circuit includes a differential amplifier and two switches to remove parasitic capacitance and transfer charge. The operation is validated by HSPICE for one-pixel and RTL simulation including logic synthesis for the full chip design on condition of 0.18μm typical CMOS process and 1.8V power. The voltage difference between a ridge and valley is about 215mV after 10 clock cycles and 367mV after 20 clock cycles. The maximum frequency of cell operation is 10MHz. The layout is performed by full custom flow for one-pixel and auto P&R for the full chip. The area of the full chip is 4943μm x 3943μm and the gate count is 542,000. The area of one-pixel is 50μm x 50μm. Pitch is 50μm and image resolution is 508dpi.

A Modified Architecture for Fingerprint Sensor of Switched Capacitive Integrator Scheme

Seungmin Jung 보안공학연구지원센터 2016 International Journal of Bio-Science and Bio-Techn Vol.8 No.6

In this paper, modified architecture of CMOS capacitive fingerprint sensor readout circuit is presented for general type of a switched capacitive integrator scheme. The proposed architecture supports wide and flexible operation range without ADC. It also operates faster than a typical integrator scheme for one frame image capture. The circuit includes an analog comparator in each pixel and counters. The referenced analog voltage of each sensor cell is controlled by an external or internal bias.

The Effect of Security Awareness Training on the Use of Biometric Authentication: Focusing on the Protection Motivational Behaviors

Seungmin Jung,Joo Yeon Park 한국데이타베이스학회 2020 Journal of information technology applications & m Vol.27 No.2

The purpose of this study is to investigate the behavioral factors affecting the security attitude and intention to use biometrics password based on the protection motivation theory. This study also investigates security awareness training to understand trust, privacy, and security vulnerability regarding biometric authentication password. This empirical analysis reveals security awareness training boosts the protection motivational factors that affect on the behavior and intention of using biometric authentication passwords. This study also indicates that biometric authentication passwords can be used when the overall belief in a biometric system is present. After all, security awareness training enhances the belief of biometric passwords and increase the motivation to protect security threats. The study will provide insights into protecting security vulnerability with security awareness training.

Benefit of neoadjuvant concurrent chemoradiotherapy for locally advanced perihilar cholangiocarcinoma

Jung, Jang Han,Lee, Hyun Jik,Lee, Hee Seung,Jo, Jung Hyun,Cho, In Rae,Chung, Moon Jae,Park, Jeong Youp,Park, Seung Woo,Song, Si Young,Bang, Seungmin Baishideng Publishing Group Inc 2017 WORLD JOURNAL OF GASTROENTEROLOGY Vol.23 No.18

<P><B>AIM</B></P><P>To clarify the role of neoadjuvant concurrent chemoradiotherapy (NACCRT) followed by surgical resection for localized or locally advanced perihilar cholangiocarcinoma (CCA).</P><P><B>METHODS</B></P><P>We retrospectively reviewed 57 patients who underwent surgical resection with or without NACCRT for perihilar CCA; 12 patients received NACCRT and 45 patients did not received NACCRT. Patients with locally advanced perihilar CCA requiring NACCRT were defined as follows: (1) a mass involving unilateral branches of the portal vein or hepatic artery with insufficient volume of the anticipated remnant lobe; or (2) an infiltrating mass in the main portal vein that was too long for reconstruction, identified at preoperative staging.</P><P><B>RESULTS</B></P><P>The median disease-free survival (DFS) durations of the neoadjuvant and non-neoadjuvant CCRT groups were 26.0 and 15.1 mo, respectively (<I>P</I> = 0.91). The median overall survival (OS) durations of the neoadjuvant and non-neoadjuvant CCRT groups were 32.9 and 27.1 mo, respectively (<I>P</I> = 0.26). The NACCRT group showed a downstaging tendency compared to the non-NACCRT group as compared with the tumor stage confirmed by histological examination after surgery and the tumor stage confirmed by imaging test at the time of diagnosis (<I>P</I> = 0.01).</P><P><B>CONCLUSION</B></P><P>NACCRT does not prolong DFS and OS in localized or locally advanced perihilar CCA. However, NACCRT may allow tumor downstaging and improve tumor resectability.</P>

Mechanism and kinematic analysis of a robotic gadget for assisting hand movements of persons with severe disabilities to promote their community participation

Seungmin Jung,Kwang-ok An,Jongbae Kim,Hyungsik Kim 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10

Hand movements such as those necessary to use smart devices or credit cards are vital to modern-day daily life, both for able-bodied people and those with disabilities. Therefore, we have developed a robotic gadget for assisting people with severe disabilities by supporting the hand movements needed for everyday life and social activities, and thus promote those persons’ participation in the community. To select the optimal services to be provided, we implemented focus-group interviews, targeting people with spinal cord injuries above the C4 vertebrae. Based on the extracted optimal services, we developed a robotic gadget to assist with a wide range of hand movements. The robotic gadget consists of a complex work module (offering three degrees of freedom) to assist with a range of hand movements, and a robotic arm (also with three degrees of freedom) to move the complex work module. The robotic arm incorporates a “tendon mechanism” whereby wires are used to minimize the size of the robotic arm joint. A parallel link mechanism automatically controls the position of the complex work module so that the smart device always faces the user regardless of the rotation of the robotic arm. The use of the parallel link mechanism also reduces the number of actuators required to keep the complex work module facing the user. The complex work module incorporates a card holder, which can load and eject up to four cards, and uses micro piezo motors to minimize its size. By implementing kinematic analysis, we calculated the position and orientation of an end-effector that can determine the space in which the complex work module operates. In this study, we verified the performance of the robotic gadget by building a prototype. The robotic gadget for supporting hand movements can be installed on a wheelchair or within the user’s range of activity, and is expected to help severely disabled people as it improves their access to smart devices, assists them with the hand movements needed to partake in social activities, increases their interactions with able-bodied people, and promotes their participation in the community.

A Loss Minimization Method on a Reactive Power Supply Process for Wind Farm

Jung, Seungmin,Jang, Gilsoo IEEE 2017 IEEE transactions on power systems Vol.32 No.4

<P>Owing to the large physical area of a wind farm, some uncertainty and inefficiency issues exist in the related power delivery process. To provide required ancillary services regarding reactive power for the utility grid, further optimization processes are needed to maintain the reliability and efficiency of the entire system. In this paper, we introduce a reactive power assignment strategy that is based on the linearized system components of a wind farm, which comprises a power conversion system. Additionally, we perform realistic assignment processes to verify the effectiveness of this strategy with electromagnetic transients using dc software tool. Reducing the total apparent power flow by utilizing the radial structure of the wind farm is explored by assigning reactive power to nearby wind turbines. The verification process focuses on comparing the loss in output profile of a normal assignment and the proposed method in a designated wind farm.</P>

VLSI Implementation of Algorithm for Performance Improvement of Minutiae Based Fingerprint Recognition System

Seungmin Jung 한국정보과학회 2020 Journal of Computing Science and Engineering Vol.14 No.4

The fingerprint recognition system has a scheme in which the fingerprint sensor and the algorithm are separated. It is ineffective to operate a total fingerprint algorithm with various simple iterations using only the software environment. This paper proposes an effective fingerprint identification system with VLSI (very large scale integration) hardware architecture for Gabor filter and thinning processing. These two steps occupy the largest portion of CPU processing time in minutiae based fingerprint recognition algorithms. In this paper, we analyze the step-by-step operation of the algorithm using an ARM emulator. We implemented a VLSI logic circuit for hardware processing of Gabor filters and thinning in RTL. The logic is also synthesized and the layout is performed based on automatic placement-routing and post-simulation is performed in the 250n 6-metal CMOS process. The result is compared with the data of a conventional study. The proposed circuit is verified to reduce the algorithm processing time by 73%.