Search results for: Jihun Park

Items from 1 to 20 out of 50 results

article

Multifunctional Materials Strategies for Enhanced Safety of Wireless, Skin‐Interfaced Bioelectronic Devices (Adv. Funct. Mater. 34/2023)

Claire Liu, Jin‐Tae Kim, Da Som Yang, Donghwi Cho, more

Advanced Functional Materials > 33 > 34 > n/a - n/a

Wireless Wearables In article number 2302256, John A. Rogers, Ralph G. Nuzzo, Yonggang Huang, and co‐workers report a miniaturized, wireless mechanoacoustic sensor, encapsulated with a self‐healing, dynamic covalent elastomer, embedded with chemistries that provide colorimetric responses, strain‐adaptive stiffening, and thermal insulation properties relevant to the safety of wireless, skin‐interfaced...

article

Multifunctional Materials Strategies for Enhanced Safety of Wireless, Skin‐Interfaced Bioelectronic Devices

Claire Liu, Jin‐Tae Kim, Da Som Yang, Donghwi Cho, more

Advanced Functional Materials > 33 > 34 > n/a - n/a

Many recently developed classes of wireless, skin‐interfaced bioelectronic devices rely on conventional thermoset silicone elastomer materials, such as poly(dimethylsiloxane) (PDMS), as soft encapsulating structures around collections of electronic components, radio frequency antennas and, commonly, rechargeable batteries. In optimized layouts and device designs, these materials provide attractive...

article

Combined ohmic heating and krypton‐chlorine excilamp treatment for the inactivation of Listeria monocytogenes, Salmonella Typhimurium, and Escherichia coli O157:H7 in apple juice

Sang‐Soon Kim, Jihun Park, Heesoo Park, Haknyeong Hong, more

Journal of Food Safety > 40 > 1 > n/a - n/a

The combined effect of the 222‐nm krypton‐chlorine (KrCl) excilamp and ohmic heating for the inactivation of Listeria monocytogenes, Salmonella enterica serovar Typhimurium, and Escherichia coli O157:H7 in apple juice was investigated in this study. When ohmic heating and a KrCl excilamp were applied to apple juice simultaneously, the reduction level of E. coli O157:H7 following 70 s (target temperature...

article

A Recoverable Synapse Device Using a Three‐Dimensional Silicon Transistor

Jae Hur, Byung Chul Jang, Jihun Park, Dong‐Il Moon, more

Advanced Functional Materials > 28 > 47 > n/a - n/a

To prepare for the upcoming big‐data era, numerous attempts are underway to develop a neuromorphic system which is capable of imitating a biologic neural network. Despite the significant improvements to software‐based artificial neural networks (ANNs) recently, they remain inefficient in terms of energy use. Alternatively, many researchers have been attracted to hardware‐based ANNs by fundamentally...

article

Alpha-invariants and purely log terminal blow-ups

Ivan Cheltsov, Jihun Park, Constantin Shramov

European Journal of Mathematics > 2018 > 4 > 3 > 845-858

We prove that the sum of the $$\alpha $$ α -invariants of two different Kollár components of a Kawamata log terminal singularity is less than 1.

article

K-stability of smooth del Pezzo surfaces

Jihun Park, Joonyeong Won

Mathematische Annalen > 2018 > 372 > 3-4 > 1239-1276

In a new algebro-geometric way we completely determine whether smooth del Pezzo surfaces are K-(semi)stable or not.In the present article, all varieties are defined over an algebraically closed field k of characteristic 0.

chapter

A comparison of convolutional object detectors for real-time drone tracking using a PTZ camera

Jihun Park, Dae Hoe Kim, Young Sook Shin, Sang-ho Lee

2017 17th International Conference on Control, Automation and Systems (ICCAS) > 696 - 699

2017 17th International Conference on Control, Automation and Systems (ICCAS)

As highly maneuverable drones are available at the low price, the threats that might be caused by the drone attacks has been increased. Recent object detectors have been dramatically improved in accuracy by using convolutional neural networks, and these can be utilized to identify hostile drones. In this paper, we examine state-of-the-arts convolutional object detectors for a real-time drone detection...

article

Alignment Between Internal and External IT Governance and Its Effects on Distinctive Firm Performance: An Extended Resource-Based View

Jihun Park, Jae-Nam Lee, One-Ki Daniel Lee, Yunmo Koo

IEEE Transactions on Engineering Management > 2017 > 64 > 3 > 351 - 364

Only a few firms possess all of the information technology (IT) resources required to compete effectively in today's dynamic business environment. Consequently, firms face critical challenges in developing their IT governance by integrating, building, and reconfiguring IT resources available internally and externally to achieve a competitive advantage. However, prior studies have mostly examined IT...

article

Stretchable electronic devices using graphene and its hybrid nanostructures

Jihyun Paek, Joohee Kim, Byeong Wan An, Jihun Park, more

FlatChem > 2017 > 3 > C > 71-91

Research of flexible and stretchable electronic devices has shown remarkable development due to the remarkable characteristics of graphene. To exploit these characteristics, many devices have been developed using graphene-based hybrid materials or structures. In this paper, we present the electrical, optical, thermal, and mechanical properties of graphene and then provide information concerning the...

article

Effect of multi-vendor outsourcing on organizational learning: A social relation perspective

Yunmo Koo, Jae-Nam Lee, Cheng Suang Heng, Jihun Park

Information & Management > 2017 > 54 > 3 > 396-413

The growing trend of engaging multiple vendors, coupled with the concern over “possible” loss of knowledge in information technology (IT) outsourcing relationships, compels us to investigate organizational learning in multi-vendor outsourcing from a social relation perspective. Social relation has been conceptualized in terms of how organizational relationships with social entities facilitate and/or...

chapter

Geometry-Based Muscle Forces and Inverse Dynamics for Animation

Jihun Park, Sunghun Park, Yoohun Won

Lecture Notes in Computer Science > Technologies for E-Learning and Digital Entertainment > Geometry in Games and Virtual Reality > 584-595

In this paper, we present an animation technique based on muscle forces, inverse dynamics and a parameter optimization. We do a crude motion planning in terms of accelerations. By integrating the accelerations given an initial configuration, we obtain all essential kinematic data. We evaluate the quality of motion planning by using various constraints and a performance index evaluated using inverse...

article

Graphene-Based Wireless Environmental Gas Sensor on PET Substrate

Kyungmin Na, Hyunggun Ma, Jihun Park, Junho Yeo, more

IEEE Sensors Journal > 2016 > 16 > 12 > 5003 - 5009

Modern gas detection systems have expanded into the monitoring of greenhouse gases, which are believed to cause global warming and are toxic to the human body. This demand has led to the development of numerous different discrete and distinct sensor technologies. A wireless sensing system is formed using the integrated arrays of field-effect transistors and sensors comprising graphene channels, silver...

article

An empirical study of supplementary patches in open source projects

Jihun Park, Miryung Kim, Doo-Hwan Bae

Empirical Software Engineering > 2017 > 22 > 1 > 436-473

Developers occasionally make more than one patch to fix a bug. The related patches sometimes are intentionally separated, but unintended omission errors require supplementary patches. Several change recommendation systems have been suggested based on clone analysis, structural dependency, and historical change coupling in order to reduce or prevent incomplete patches. However, very few studies have...

chapter

LOD Canny Edge Based Boundary Edge Selection for Human Body Tracking

Jihun Park, Tae-Yong Kim, Sunghun Park

Lecture Notes in Computer Science > Image Analysis and Recognition > Tracking > 528-535

We propose a simple method for tracking a nonparameterized subject contour in a single video stream with a moving camera and changing background. Our method is based on level-of-detail (LOD) Canny edge maps and graph-based routing operations on the LOD maps. LOD Canny edge maps are generated by changing scale parameters for a given image. Simple (strong) Canny edge map has the smallest number of edge...

chapter

Model-Based Human Motion Tracking and Behavior Recognition Using Hierarchical Finite State Automata

Jihun Park, Sunghun Park, J. K. Aggarwal

Lecture Notes in Computer Science > Computational Science and Its Applications – ICCSA 2004 > Track on Signal Processing > 311-320

The generation of motion of an articulated body for computer animation is an expensive and time-consuming task. Recognition of human actions and interactions is important to video annotation, automated surveillance, and content-based video retrieval. This paper presents a new model-based human-intervention-free approach to articulated body motion tracking and recognition of human interaction using...

chapter

Human Motion Tracking by Combining View-Based and Model-Based Methods for Monocular Video Sequences

Jihun Park, Sangho Park, J. K. Aggarwal

Lecture Notes in Computer Science > Computational Science and Its Applications — ICCSA 2003 > Animation and Motion > 650-659

Reliable tracking of moving humans is essential to motion estimation, video surveillance and human-computer interface. This paper presents a new approach to human motion tracking that combines view-based and model-based techniques. Monocular color video is processed at both pixel level and object level. At the pixel level, a Gaussian mixture model is used to train and classify individual pixel colors...

chapter

Quaternion-Based Tracking of Multiple Objects in Synchronized Videos

Quming Zhou, Jihun Park, J. K. Aggarwal

Lecture Notes in Computer Science > Computer and Information Sciences - ISCIS 2003 > Graphics & Computer Vision > 430-438

This paper presents a method for tracking multiple objects using multiple cameras that integrates spatial position, shape and color information to track object blobs. Given three known points on the ground, camera calibration is computed by solving a set of quaternion-based nonlinear functions rather than solving approximated linear functions. By using a quaternion-based method, we can avoid the singularity...

chapter

Object Tracking and Elimination Using Level-of-Detail Canny Edge Maps

Jihun Park

Lecture Notes in Computer Science > Articulated Motion and Deformable Objects > Articulated Motion and Deformable Objects AMD$O^{−e}$ 2006 > 281-290

We propose a method for tracking a nonparameterized subject contour in a single video stream with a moving camera. Then we eliminate the tracked contour object by replacing the background scene we get from other frame that is not occluded by the tracked object. Our method consists of two parts: first we track the object using LOD (Level-of-Detail) canny edge maps, then we generate background of each...

chapter

Object Boundary Edge Selection Using Level-of-Detail Canny Edges

Jihun Park, Sunghun Park

Lecture Notes in Computer Science > Computational Science and Its Applications – ICCSA 2004 > Track on Signal Processing > 369-378

Recently, Nguyen proposed a method[1] for tracking a nonparameterized object (subject) contour in a single video stream with a moving camera and changing background. Nguyen’s approach combined outputs of two steps: creating a predicted contour and removing background edges. Nguyen’s background edge removal method of leaving many irrelevant edges is subject to inaccurate contour tracking in a complex...

chapter

Model-Based Human Motion Capture from Monocular Video Sequences

Jihun Park, Sangho Park, J. K. Aggarwal

Lecture Notes in Computer Science > Computer and Information Sciences - ISCIS 2003 > Graphics & Computer Vision > 405-412

Generating motion and capturing motion of an articulated body for computer animation is an expensive and time-consuming task. Conventionally, animators manually generate intermediate frames between key frames, but this task is very labor-intensive. This paper presents a model-based singularity-free automatic-initialization approach to capturing human motion from widely-available, static background...

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INFONA - science communication portal

Search results for: Jihun Park

Multifunctional Materials Strategies for Enhanced Safety of Wireless, Skin‐Interfaced Bioelectronic Devices (Adv. Funct. Mater. 34/2023)

Multifunctional Materials Strategies for Enhanced Safety of Wireless, Skin‐Interfaced Bioelectronic Devices

Combined ohmic heating and krypton‐chlorine excilamp treatment for the inactivation of Listeria monocytogenes, Salmonella Typhimurium, and Escherichia coli O157:H7 in apple juice

A Recoverable Synapse Device Using a Three‐Dimensional Silicon Transistor

Alpha-invariants and purely log terminal blow-ups

K-stability of smooth del Pezzo surfaces

A comparison of convolutional object detectors for real-time drone tracking using a PTZ camera

Alignment Between Internal and External IT Governance and Its Effects on Distinctive Firm Performance: An Extended Resource-Based View

Stretchable electronic devices using graphene and its hybrid nanostructures

Effect of multi-vendor outsourcing on organizational learning: A social relation perspective

Geometry-Based Muscle Forces and Inverse Dynamics for Animation

Graphene-Based Wireless Environmental Gas Sensor on PET Substrate

An empirical study of supplementary patches in open source projects

LOD Canny Edge Based Boundary Edge Selection for Human Body Tracking

Model-Based Human Motion Tracking and Behavior Recognition Using Hierarchical Finite State Automata

Human Motion Tracking by Combining View-Based and Model-Based Methods for Monocular Video Sequences

Quaternion-Based Tracking of Multiple Objects in Synchronized Videos

Object Tracking and Elimination Using Level-of-Detail Canny Edge Maps

Object Boundary Edge Selection Using Level-of-Detail Canny Edges

Model-Based Human Motion Capture from Monocular Video Sequences

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