Session 1: Tuesday 6th May 2008

Ahn Seonmin
Swinging Higher and More Safely: A Mathematical Model
Compuational Mathematics Lab
Department of Mathematical Sciences

Kim TaeDong
Checking Errors Using Event Logs: A Report
Virtual Manufacturing Systems Lab
Department of Industrial Engineering






Seong KyungChan
Development of a Capacity-Filtering Method for the Medium-Term Scheduling of Semiconductor Fab: A Final Report
Virtual Manufacturing Systems Laboratory
Department of Industrial Engineering





Jeon NamHo
Oxide Thin-Film Transistors: Introduction and a Review of Recent Advances
Integrated Organic Electronics Laboratory
Department of Electrical Engineering






Tran Ngoc Tung
The Differentiation of Human Embryonic Stem Cells into Mesoderm Progenitor Cells by Controlling the TGF-b and WNT Signaling Pathways
Stem Cell Research Center
Department of Biological Sciences




Yun Hyeok
Coherent X-ray Source Development by Manipulating Atoms in a Super-Intense Femtosecond Laser Field
Coherent X-ray Research Center
Department of Physics

06may2008

Session 2: Thursday 8th May 2008

Yoo JeongSik
A Hybrid Analytical Modeling Method for Signal Via Transition Traces in Multi-Layer PCB's
Terahertz Interconnection & Package Laboratory
Department of Electrical Engineering

Hwang ChulSoon
Electromagnetic Band Gap Structures for the Stabilization of Chip Operation in Mobile Devices
Terahertz Interconnection & Package Laboratory
Department of Electrical Engineering




Park SunYoung
Physical Movement and Its Use as a Desgn Element in Enchancing the Emotional Value Of a Product
Collaboration and Interaction Design Laboratory
Department of Industrial Design





Pak JiWoo
3-D Sip (Systems-in-Package) Design and Simulation for T-DMB
Terahertz Interconnection and Package Laboratory
Department of Electrical Engineering






Oktay Yarimaga
SU-8 Layers for Polystyrene and Teflon Releasing Processes: A Qualitative Comparison
Nano Oriented Bio-Electronic Laboratory
Department of Electrical Engineering

Kim BoA
Contextual Awareness for Users in Mobile Culture: A Literature Review
Human Centered Interaction Design Laboratory
Department of Industrial Design




Kim BoRam
Reducing backward radiation of folded dipole antenna by using ground reflector
Radio Frequency System Solution Lab
Department of Electrical Engineering



08may2008

Session 3: Tuesday 13th May 208

Vo Van Quang
Swarm Intelligence: Swarm-Based Formations for Groups of Mobile Robots
The Future Beyond Human Intelligence Laboratory
Department of Electrical Engineering

Kim BoMi
Visual Identity of Robotic Products: A Report
Product Environment and Systems Labaratory
Department of Industrial Design

Mao WenTao
Evolutionary Computation' [EC] and its Application in the Solutions to Mathmatical Problems
The Future Beyond Human Intelligence Laboratory
Department of Electrical Engineering

Han SongHee
The identification of Molecular Intrinsic Properties: High Resolution Ionization Spectroscopy for the Molecular Cation in the Gas Phase
Chemical Dynamics & Nano Materials Laboratory
Department of Chemistry





Park HyunHee
Single-Inductor Multple Outpits with DC-DC Converters
Design & System Application Lab
Department of Engineering





Ha HeonJoo
A New Method of Using Carbon Nanotubes as a Capacitor: Theory and Expectations
Polymer Engineering Laboratory
Department of Chemical & Biomolecular Engineering



13may2008

Session 4: Thursday 15th May 2008

Cho Heyrim
Blending Based on Partial Differtential Equations and Numerical Analysis
Computational Mathematics Lab
Department of Mathematical Sciences

Lee JinYoung
Image Processing and Video Coding: An Overview
Image Computing Systems Lab
Department of Electrical Engineering

Choe JeeHyun
'Mean-Shift' Algorithims and their Application in Face-Tracking Technology : A Report
The Future Beyond Human Intelligence Laboratory
Department of Electrical Engineering

Ryu WonHee
TiO2 Nanotube Arrays and their Fabrication Through the Use of the 'Anodization Method': A Literature
Corrosion & Energy Storage Materials Lab
Department of Materials Science and Engineering

Youn JaeSung
BaCeO3 as an Impurity of YBCO Superconductors: A Literature Review
Electronic and Optical Materials Laboratory
Department of Materials Science and Engineering






Han Seungchan
Cost-Effective Fabricated Solar Cells Based on Organic Materials: A Report
Integrated Organic Electronics Laboratory
Department of Electrical Engineering






Celal Avcil
A Multimode Transmitter in 0.13 um CMOS Using Direct-Digital RF Modulators: A Review
Integrated Circuits and Systems Lab
Department of Electrical Engineering





15may2008

Session 5: Tuesday 20th May 2008

Im SangHui
Symmetries as Fundamental Principles in Physics
Theoretical High Energy Physics Lab
Department of Physics





Kim YoungMin
Electron Beam Iradiation and its Use in the Fabrication of Transition Aluminas
High Resolution Electron Microscopy Lab
Department of Materials Science & Engineering

Kim SungWook
The Phase Control of Iridium and Iridium Oxide in Atomic Layer Deposition: A Report
Semiconductor Materials Laboratory
Department of Materials Science and Engineering

Kang SeungMo
Large Grain Poly-Si Thin Film fFbrication through the Use of Vapor Induced Cyrstalization and Post Pulsed RTA
Photovoltaic Materials Laboratory
Department of Materials Science and Engineering

Sun JaeSang
Trajectory Optimization for Mapping by Reinforcement Learning: A Literature Review
Robot Intelligence Technology Lab
Department of Electrical Engineering

Eugene Park
How Today's internet is Killing Our Culture: A Book Review
Cultural Management and Policy Laboratory
Department of Culture Technology




Sah YoungJune
A New Model for Measuring the Effects of Word of Mouth on the Dynamics of Weekly Cinema Box Office Takings
Cultural Management and Policy Laboratory
Department of Culture Technology


20May2008

Session 6: Thursday 22nd May 2008

Lee JungWoo
Locating Landfills: Optimization vs. reality : Literature Review
Business Economics & Center for Science-Based Entrepreneurship
Department of Industrial Engineering





Lee BoRam
Emotional Response to Haptic Manipulation of a Physical Object
Design Media Lab
Department of Industrial Design

Lee Joonsuk
Phase-change Nanowries and their use in Memory Device Applications: A LIterature Review
Electronic and Optical Materials Laboratory
Department of Materials Science and Engineering



Oh HyoJung
The Application of Goal and Scenario Based Modeling Rules in Robot Design
Product Environmental System Design Laboratory
Department of Industrial Design




Woo SeongWoo
Manufacturing tactile sensors using ink-jet printers with creative ink: A Research Report
Electronic and Optical Materials Laboratory
Department of Materials Science and Engineering

Nikolay Tsvetklov
High-ordered nanostructures for the improvement of dye-sensitized solar cells: A Research Report
Photovoltaic Materials Laboratory
Department of Materials Science and Engineering

22may2008

Differentiation of human embryonic stem cells into mesoderm progenitorcells by controlling the TGF-b and WNT signaling pathway

Tran Ngoc Tung

Human embryonic stem (hES) cells have a unique ability to proliferate unlimitedly while maintaining the pluripotency (capability of differentiating into all cell types of human body). The pluripotency of human embryonic stem cells is regulated by the co-operation of many intracellular signaling pathways such as: TGF-b and WNT signaling pathways. In this paper, we investigated the function of two these signaling pathways in differentiation ability of hES cells. Human embryonic stem cells were cultured under the feeder-free condition in condition medium containing Activin A (5ng/ml) and BIO (2mM) (6-bromoindirubin-3'-oxime) - the activators of TGF-b and WNT signaling pathways respectively. After 3 days, mesoderm progenitor cell marker genes such as Brachuyry, goosecoid, MIXL1, and wnt3 were highly expressed, while the pluripotency-associated gene markers (Oct4, nanog) were down-regulated. This cell population can further differentiate into mesenchymal stem cells derived from mesoderm progenitor cells. In conclusion, the activation of these two signaling pathway induced hES cells to differentiate into mesoderm progenitors.

Swinging Higher and More Safely: A Mathematical ModelAhn Seonmin

Swinging on swings is one of the classic activities enjoyed by people all over the world. While people swing back and forth automatically, there exist techniques to make one swing higher. We found the optimal method by mathematical modeling. We started off with a model of a simple pendulum and analyzed its motion. We examined 4 realistic methods to swing and concluded that the most efficient method is to pump vigorously after passing the lowest point. We also proposed a safe swing which does not allow one to swing too high. If a swing is propelled excessively and goes too high, it is dangerous. This can be prevented by controlling the damping ratio of a swing. We substituted several damping ratios to our swing model, and found that 0.193 is a safe damping ratio. We used Newton's laws to establish the governing equation for the swing model and considered changes in energy to find the optimal point to start pumping.

A Hybrid Analytical Modeling Method for Signal Via Transition Traces in Multi-Layer PCB's J

Yoo Jeongsik

As multiple chips are being integrated into a single package with increased operation frequency, switching noise coupling on power, ground plane have become an important design issue. To reduce the noise coupling, ‘split power plane’ and ‘electromagnetic bandgap (EBG)’ structures have been generally used in package substrates having substrates multilayered power and ground planes. Consequently, there is an increasing need for an efficient method to analyze a split power ground plane in a multilayered package. This paper introduces a hybrid analytical modeling method for characterizing the split power, ground plane and especially about signal via transition trace in a multilayer package. The proposed method uses a resonant cavity model combined with a segmentation method. To verify the proposed method, multilayered test package are fabricated and tested by means of frequency domain measurements. In addition, an optimal power, ground plane design method was successfully demonstrated for suppressing noise coupling between chips on a single package.

Electromagnetic Band Gap Structure for the Stabilization of Chip Operation ... Chulsoon Hwang

Electromagnetic Band Gap Structure for the Stabilization of Chip Operation in Mobile Devices

The signal via is heavily used in both high-density System-in-Package (SiP)’s and printed circuit board(PCB).’s Furthermore, power ground plane used for low impedance of power distribution network causes cavity noise the caused cavity noise is coupled through the signal via when reference plane of the signal via is exchanged. The coupled cavity noise degrades transition signal quality. In multi-layer board, the high frequency cavity noise is inevitable to reference plane change via . In this paper, reference plane change via analysis in electromagnetic band-gap (EBG) structure is made. EBG structures are used to make ensure return current path of reference plane change via. With ring structure, the mushroom type EBG is used to prevent cavity noise coupling into signal via by suppression cavity resonance near signal via. It is shown that, within the stop band, return current path of via in EBG structure is free from cavity resonance noise. In the presence of EBG structures and slot in power plane, the voltage noise and timing jitter are significantly reduced for random noise source.

Oxide Thin-Film Transistors: Introduction and a Review of Recent Advances

Namho Jeon

In this paper I review recent progress made in the area of materials, fabrication processes, device designs, and applications related to oxide thin-film transistors(TFTs), with an emphasis on papers published during last decade. Oxide semiconducting materials were first used as a active layer of TFTs in 1995 and there are exact properties of them and operating mechanisms as a active material of TFTs since history of them is quite short. Some earlier papers that played an important role in shaping the oxide TFT field are included, and a number of previously published review papers that cover that early period more completely are referenced. Markets are requires ultimate optoelectronics and displays with low cost, transparent and flexible TFT devices. It is forecasted that oxide TFTs lead new explosive growth in the next generation of display. Oxide TFTs have a lot of beauty points to realize the ultimate optoelectronics and displays but still have many challenges to overcome. New values of oxide TFTs can generate new applications.

Development of A Capacity-Filtering Method for Medium-term Scheduling of Semiconductor Fab

Seong KyungChan
The operational management of an electronics Fab such as semiconductor Fab, LCD Fab or PCB Fab requires long-term planning, medium-term scheduling and short-term control. Among the three areas, the weakest link is the medium-term scheduling or finite-capacity planning area which is responsible for generating mid-term schedule or finite-capacity plans. In such an electronic Fab, medium-term schedules such as release plan production plans are critical in achieving the goal of full capacity and on-time production. However, existing finite capacity planning methods, including time-bucking and time-shifted POR approachs which are most widely employed, are not able to accommodate the capacity fluctuations that can arise in the electronics Fab, especially the semiconductor Fab. In most semiconductor Fabs, there are workstations that are near-bottleneck, any of which may become a bottleneck at a given points in time due to changing product mixes and unexpected down time. Managing the interactions between these near-bottleneck stations to maintain high throughput and on-time delivery performance is a very challenging task. This is why existing finite capacity methods have difficulty planning and scheduling in semiconductor Fab. As other theoretical approaches also have shortcomings, it is anticipated at present that the capacity-filtering method proposed in this thesis is a viable solution.The comparative performance analysis of a real semiconductor Fab demonstrates that the proposed capacity-filtering method is superior to the existing ‘time-bucketing’ and ‘time-shifted POR’ methods. While a major drawback of this approach is that the fixed-size time-buckets do not adequately reflect the actual line capacity, the proposed method is able to be flexible enough to permit quick replanning. In addition they are able to produce high-quality production plans. This is one of reason why the proposed method is better than the others. What in more, this thesis represents a possibility that it can be used in ‘real-life’ release planning and Fab-out (production) planning.

Checking Errors Using Event Logs: A Report Kim TaeDong

There are many processes in the world open to fraud and audit principles are developed to prevent them. While a lot of research has been conducted with respect to the application of these principles to the process of fraud protection / prevention, most of it has related to the design process. As a result while they can check the process design model, if people violate them when the process executes, they can’t be checked. In this paper we suggest checking principles using event logs in order to catch runtime violations and previous records. To use event logs for checking principles, we define an event log with document information and logic using the event log definition. We use an accounting process as an example process, and then we evaluate the logic. In that evaluation, we insert violation not in the model but in the event log and the logic almost catches the violation.

Coherent X-ray Source Development by Manipulating Atoms in a Super-Intense Femtosecond Laser Field

Yun Hyeok

From the development of super-intense and ultrafast laser fields, strong field phenomena came into being newly in atomic physics related to optics. One phenomena related to strong field effect, which is used to generate coherent X-ray, is high harmonic generation. High harmonic waves are generated by repeated modulation of electron orbit around nucleus by intense laser field. Coherent X-ray, one of high harmonic waves, gives rise to a new era of extreme science in space and time; nano-metrology and atto-physics.

Swarm Intelligence: Swarm-based formations for groups of mobile robots

Vo Van Quang

Humans are the most social of animals: we live together in families, tribes, nations, behaving and thinking according to the rules and the norms of our communities. We can envision a future in which robots can become cooperative partners than mindless machines. In fact, some robotic tasks require an accomplishment of a group of robots such as transportation, surveillance, agriculture, defense, health-care and many others. Multiple robots in cooperation outperform independently-operating robots in terms of flexibility and fault tolerance. One of critical obstacle in the deployment of groups of mobile robots is related to their limited navigational abilities, especially when they do tasks in an unknown area. This lead to need for formation control strategies. To coordinate a group of mobile robots, swarm intelligence is adopted in order to obtain near-optimal settings of the control parameters. Here, the motion of mobile robots can be treated as an aggregation of a group of living species evolving under social interactions, e.g. bird flocks or fish schools. Having done this, the cooperative control of the robots is formulated as an optimization problem, where the particle swarm optimization (PSO) algorithm is applied to satisfy the multi-objective goal of formation establishment and collision avoidance.

Locating landfills—Optimization vs. reality

Lee Jungwoo

This paper is a review of an article by H. A. Eiselt, contained in the European Journal of Operational Research of the 15th of November 2005. Eiselt’s paper deals with an application of location models to the sighting of landfills. It focuses on the difference between locations of existing landfills and garbage transfer stations and optimized ones in New Brunswick, one of Canada’s Maritime Provinces. The primary questions addressed by the paper are: how far the pattern of the actual observed solutions deviates from the optimized solution and, should examined proximity of optimized solution and observed solution using LP(Linear Programming) formulation.

Phase-change Nanowries and their use in Memory Device Applications: A LIterature Review

Lee Joonsuk

While phase change materials have been used for optical recording such as CD, DVD by reflectivity change from amorphous to crystalline they have also attracted a lot of research interests recently for their great potential to be utilized as non-volatile electronic memory using resistivity change from amorphous to crystalline. Lots of device structures are investigated to obtain high integration, good cyclability and low power consumption. Low cyclability is the biggest barrier to overcome in order to have reliability of device operation. Phase change nanowires are being used as one of the device structures for discovering better phase changing properties. The advantages and disadvantages of phase change nanowires for memory applications will be discussed.

Study of Emotional Response to Physical Interaction

Boram Lee

These days, emotional qualities are becoming more important for product interactions and interfaces. Typically, a product’s emotional quality is enhanced through visual attributes such as color and form. However, to maximize a product’s emotional value, physical and tactual experience of using a product have recently been the focus of growing attention. Our research is focused on relating physical movement with appropriate tactual properties to increase emotional value of a product or an interaction. disconnected and slow movement is suitable for expressing oppressed and sad emotions. We assumed that certain physical movement and tactile attributes can evoke specific emotional response and tried to find out how certain combination of physical movements and tactile attributes influence to elicitation of user’s emotion.

Electron beam irradiation and its use in the fabrication of transition aluminas

Young-Min Kim

Metastable transition aluminas such as χ- and γ-Al₂O₃ of α-alumina have been widely investigated with the viewpoints of materials processing and structure evolution because they are promisingly used as an industry catalysts and precursors for the fabrication of alumina ceramics. By virtue of such studies, efficient processing conditions to synthesis transition phases of α-Al₂O₃ have been well known in a large scale based on thermal processes. Recently, many researchers have devoted themselves to finding a solution for the size control at nanoscale and the desirable polymorph formation among aluminas. New synthetic processes using microwave plasma, electron, and ion beam irradiation techniques as well as thermal decomposition have been proposed for such purposes. As is well known, electron beam induced phenomena are of manifold interests related to radiation damage, crystallization and growth, and deposition because electron beams can be controlled by electromagnetic lenses and are also important in the fabrication of position and size controlled nanomaterials possible as well as to investigate their structures and chemistries. Therefore, among the methods to synthesize transition aluminas, satisfying the current research demands as mentioned above, electron beam irradiation may be a promising technique to fabricate desirable transition alumina at nanoscale. In this study, we focused on quantitative radiation characterization of transition aluminas from gibbsite induced by electron beam irradiation. In doing so, we quantitatively investigated variations of diffraction intensities according to structural changes with imaging plate technique. Furthermore, high-resolution electron microscopy (HREM) was involved in order to comprehend nanocrystallization of transition alumina at atomic level. In particular, our present study may first suggest practical approaches to the selective synthesis of transition alumina from aluminum hydroxide at interested region with electron beam irradiation techniques.

The Phase Control of Iridium and Iridium Oxide in Atomic Layer Deposition: A Report

Kim Sung-Wook

The atomic layer deposition (ALD) of iridium (Ir) and iridium oxide (IrO2) films was investigated using an alternating supply of (ethylcyclopentadienyl)(1,5-cyclooctadiene) iridium [Ir(EtCp)(COD)] and oxygen gas at temperatures between 230 and 290 °C. The phase transition between Ir and IrO2 occurred at the critical oxygen partial pressure during the oxygen injection pulse. The oxygen partial pressure was controlled by O2/(Ar+O2) ratio or deposition pressures. The resistivity of the deposited Ir and IrO2 films was about 9 and 120 μΩ-cm, respectively. In addition, the critical oxygen partial pressure for the phase transition between Ir and IrO2 was increased with increasing a deposition temperature. Thus, the phase of the deposited film, either Ir or IrO2, was controlled by the oxygen partial pressure, and a deposition temperature. However, a formation of thin Ir layer was detected between IrO2 and SiO2 substrate at IrO2 formation condition. To remove this interfacial layer, oxygen partial pressure was increased to severe condition.

Symmetries as fundamental principles of Physics

Im SangHui

Physical laws are a kind of “restriction” governing the motion or dynamics of physical entities, and symmetry refers to the invariant property of a physical system under some transformation. Modern physics has found that almost all of the fundamental physical laws, discovered up to now, can be seen as consequences of certain symmetries. In addition physicists are now using symmetries in order to pioneer new fundamental laws or principles of nature. In this seminar, we will clarify what this means and review how the principal laws of physics can be implied by their corresponding symmetries. First we will introduce the “action principle” which plays important role with symmetries in determining the equations of motion in physics, which states that a physical system moves in a path where its “action” is minimized. We will then define what symmetry means mathematically in the context of the action principle. Then we will firstly see that the famous Newton’s laws of motion have rotation, (Galilean) boosting, and translation symmetries and we will show that some of these laws can be viewed conversely as a consequence of those symmetries with the action principle. Secondly we will examine the symmetries in classical electromagnetism which was another realm of classical physics with Newton’s laws, and we will show that it has (Lorentz) boosting symmetry with other symmetries in Newton’s laws. We will note that actually the finding of this new symmetry gave birth to the Einstein’s special theory of relativity. Generalizing the Lorentz symmetry to be local, we will also see that the Einstein’s general relativity, which modifies Newton’s gravity, can be derived. After this, we are going to smaller world where quantum mechanics is applied. There, we’ll see that the particle physics called Standard model including three fundamental forces other than gravity is described by (internal) gauge symmetries and its spontaneous breaking. Finally, we will mention Supersymmetry and its spontaneous breaking currently studied as being expected to be new physics beyond the established Standard model.

Image Processing and Video Coding

Lee JInYoung

Image Processing is a rapidly evolving field with growing applications in science and engineering, such asmage transmission, storage for business applications, medical processing, and most industrial operations.Many theoretical as well as technological breakthroughs have emerged in order to serve people with the high level visual functions. In addition, video coding has become an important issue thanks to the success of digital TV and DVD video. Video coding standards such as MPEG-x, H.263, and H.264/AVC [which is an efficient technology to compress video source according to bandwidth's characteristic and power limit of final terminals] are widely used in most digital visual devices. This presentation addresses the fundamentals of major topics of image processing and video coding.

TiO2 Nanotube Arrays and their Fabrication Through the Use of the 'Anodization Method'

Ryu Won-Hee

In this paper we review the fabrication, properties, and solar energy applications of highly ordered TiO2 nanotube arrays made by anodic oxidation of titanium in fluoride-based electrolytes. The material architecture has proven to be of great interest for use in water photoelectrolysis, photocatalysis, heterojunction solar cells, and gas sensing. We examine the ability to fabricate nanotube arrays of different shape (cylindrical, tapered), pore size, length, and wall thickness by varying anodization parameters including electrolyte concentration, pH, voltage, and bath temperature, with fabrication and crystallization variables discussed in reference to a nanotube array growth model.

Image blending: based on partial differential equation and numerical analysis

Cho Heyrim

Image blending based on warping is a method of image processing, the aim of which is to to automatically generate sequence of intermediate image between the two different images.

The original model is constructed with partial differential equations, and includes the idea of blending the intensity and warping the shape of the image. It uses the idea of warping shapes by level set approach to obtain a sequence of image blending. The key method is by minimizing the energy functional which represents the area that has not been overlapped between two images. However, this model is useful only to images having overlapping region. The model removes the limitation of the model, makes it applicable to non-overlapping images by defining another functional representing the distance. Moreover, it generates a clearer sequence of intermediate image by adding another deformation vector, therefore successfully reducing the blurring effect of the image.