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98 results on '"Kim, Daewoong"'

1. ViolinDiff: Enhancing Expressive Violin Synthesis with Pitch Bend Conditioning

Author

Kim, Daewoong, Dong, Hao-Wen, and Jeong, Dasaem

Subjects
Computer Science - Sound, Computer Science - Artificial Intelligence, Computer Science - Machine Learning, Electrical Engineering and Systems Science - Audio and Speech Processing, Electrical Engineering and Systems Science - Signal Processing
Abstract

Modeling the natural contour of fundamental frequency (F0) plays a critical role in music audio synthesis. However, transcribing and managing multiple F0 contours in polyphonic music is challenging, and explicit F0 contour modeling has not yet been explored for polyphonic instrumental synthesis. In this paper, we present ViolinDiff, a two-stage diffusion-based synthesis framework. For a given violin MIDI file, the first stage estimates the F0 contour as pitch bend information, and the second stage generates mel spectrogram incorporating these expressive details. The quantitative metrics and listening test results show that the proposed model generates more realistic violin sounds than the model without explicit pitch bend modeling. Audio samples are available online: daewoung.github.io/ViolinDiff-Demo.

Published
2024

3. Designing a History Museum Based Outreach Program with Digital Content

Author

Quiroga, Jacobo Moreno and Kim, Daewoong

Abstract

This study expands on the concept of outreach programs: museum initiatives that look for ways to reach and share knowledge outside their installations, often to schools. We aim to study approaches for the development of content for a history museum outreach program using digital technologies. The significance of this lies in investigating ways to bring the knowledge of the museum to schools that cannot have easy access to them. Three different content approaches were developed and tested. The first was an Assemblable walls exhibition, consisting of a modular structure in which three different exhibition methods were presented: object, video and interactive. Second, was a Hands-on interactive exhibition, consisting of a portable system that includes digital and analogue activities in an application developed for a smart projector. Lastly, the third approach was an interactive experience, which incorporated the various approaches tested previously and expanded upon them. In our conclusions, we stress the significance of this research regarding offering museum content to schools without easy access and offer a list of suggestions based on our findings that museum curators could follow when considering the development of an outreach program with digital content.

Published
2019

7. Berlin Green-Coated Cellulose Paper for Hydrovoltaic Electricity and Solar Steam Cogeneration

Author

Wani, Tawseef A., Kim, Daewoong, Choi, Jihun, Song, Minjae, and Jeon, Sangmin

Abstract

Generating both freshwater and electricity from solar energy offers a promising solution to the global challenges of freshwater scarcity and energy demand. Evaporation-induced electricity generation is a key technology in advancing sustainable energy technologies. However, it faces limitations such as low output power, complex fabrication processes, and inefficiency with highly concentrated water like seawater. In this study, we introduce a solution by fabricating a dual-layered structure consisting of Berlin green (BG) and carbon black (CB) coated onto a cellulose paper substrate (PS) (CB/BG@PS). This structure enables simultaneous water-induced electricity generation and solar-induced freshwater production. By leveraging the electrokinetic effect and the electrochemical energy produced by the interaction of salt ions with BG, the short-circuit current of the CB/BG@PS device is significantly enhanced compared to CB@PS based on the electrokinetic effect alone. A single CB/BG@PS device with an active area of 3 cm × 3 cm can sustainably output a short-circuit current of ∼48 μA and an open-circuit voltage of ∼410 mV when operating in a 0.6 M NaCl solution. Simultaneously, it achieves an evaporation rate of 2.1 kg m–2h–1under 1 sun illumination. Moreover, the combined voltage of six series-connected CB/BG@PS devices is sufficient to power some electronic devices. These findings demonstrate the potential of the proposed device for simultaneous desalination and ocean energy harvesting.

Published
2024
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19. Automatic Composition of Personalized Appreciation Route Based on Semantic Relationship between Exhibits in Museum

Author

Maehara, Chihiro, Yatsugi, Kotaro, Kim, Daewoong, Ushiama, Taketoshi, Hutchison, David, Kanade, Takeo, Kittler, Josef, Kleinberg, Jon M., Mattern, Friedemann, Mitchell, John C., Naor, Moni, Nierstrasz, Oscar, Pandu Rangan, C., Steffen, Bernhard, Sudan, Madhu, Terzopoulos, Demetri, Tygar, Doug, Vardi, Moshe Y., Weikum, Gerhard, Goebel, Randy, Siekmann, Jörg, Wahlster, Wolfgang, Setchi, Rossitza, editor, Jordanov, Ivan, editor, Howlett, Robert J., editor, and Jain, Lakhmi C., editor

Published
2010
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25. The mediating effect of sleep duration on the relationship between electronic media usage time of four-year-olds and third-grader’s peer attachment: Longitudinal analysis using latent variable modeling

Author

Choi Naya, Yun Hyun Pack, Park， Ji Eun, and Kim Daewoong

Subjects
Latent variable model, Psychology, Peer attachment, Developmental psychology, Sleep duration
Abstract

이 연구의 목적은 아동 수면시간의 변화 양상을 살펴보고, 4세 유아의 전자매체 놀이시간, 아동 수면시간 변화, 초등학교 3학년 또래애착의 구조적 관계를 살펴보는 것이다. 이를 위하여 한국아동패널 6차년도부터 10차년도까지의 자료를 이용하여, 아동 수면시간의 변화가 비선형으로 변화하는지 확인하고, 구조방정식 모형의 적합도를 살펴보았다. 연구대상은 1,435명이다. 분석결과 첫째, 4세 유아의 하루 평균 총 수면시간은 9.9시간이며, 연령이 증가함에 따라 수면시간이 감소하였다. 둘째, 4세 유아의 전자매체 놀이시간이 아동수면시간 초기치 및 이차변화율에 미치는 영향이 유의하였다. 전자매체 놀이시간이 증가할수록 하루 평균 총 수면시간이 감소하며, 연령이 증가함에 따라 수면시간 감소폭이 더 큰 것으로 나타났다. 셋째, 아동 수면시간 선형변화율 및 이차변화율이 초등학교 3학년 또래애착에 미치는 영향이 유의하였다. 수면시간이 더 많은 아동이 또래애착을 더 잘 맺는 것으로 나타났다. 이러한 결과는 아동의 사회적 관계인 또래애착에 대해 비사회적 측면인 수면이 영향을 미칠 수 있음을 의미하며, 사회 · 정서 발달 측면에서 아동의 생활습관이 고려되어야 함을 의미한다.

Published
2019

29. Stern slamming of a LNG carrier

Author

Oberhagemann, Jan, Holtmann, Michael, el Moctar, Ould, Schellin, Thomas E., and Kim, Daewoong

Subjects
Liquefied gas carriers -- Mechanical properties, Hydrodynamics -- Research, Naval architecture -- Research, Hydrofoil boats -- Hydrodynamics, Hydrofoil boats -- Research, Science and technology
Abstract

Rational assessment of stern slamming of a large twin screw liquefied natural gas (LNG) carrier comprised prediction of hydrodynamic impact loads and their effects on the dynamic global structural behavior of the hull girder. Linear theory obtained regular equivalent waves that caused maximum relative normal velocities at critical locations underneath the ship's stern. Reynolds-averaged Navier--Stokes computations based on the volume of fluid method yielded transient (nonlinear) hydrodynamic impact (slamming) loads that were coupled to a nonlinear motion analysis of the ship in waves. At every time step of the transient computation, the finite volume grid was translated and rotated, simulating the actual position of the ship. Hydrodynamic loads acting on the hull were converted to nodal forces for a finite element model of the ship structure. Slamming-induced pressure peaks, typically lasting for about 0.5 s, were characterized by a steep increase and decrease before and after the peak values. Shape and duration agreed favorably with full-scale measurements and model tests carried out on other ships, indicating the plausibility of our numerical predictions. Hull girder whipping was analyzed to investigate dynamic amplification of structural stresses. Short-duration impact-related slamming loads excited the ship structure to vibrations in a wide range of frequencies. Excitation of the lowest fundamental eigenmode contributed most to additional stresses caused by hull girder whipping. Although, for the cases investigated, longitudinal stresses and shear stresses caused by quasisteady wave bending were uncritical, we obtained a significant amplification (up to 25%) due to the dynamic structural response. [DOI: 10.111511.3124131] Keywords: stern slamming, LNG ship, whipping, RANS

Published
2009

37. A high-performance OpenVG accelerator with dual-scanline filling rendering

Author

Kim, Daewoong, Cha, Kilhyung, and Chae, Soo-Ik

Subjects
Algorithms -- Usage, Complementary metal oxide semiconductors -- Design and construction, Database searching -- Methods, Internet/Web search services -- Methods, Online searching -- Methods, Bandwidth -- Measurement, Consumer electronics -- Research, Algorithm, Bandwidth allocation, Bandwidth technology, Business, Electronics and electrical industries, Engineering and manufacturing industries
Abstract

In this paper, we propose a new search algorithm that reduces the memory bandwidth required for finding active edges in Open VG rendering. It simultaneously prepares an active edge table for each scanline so that one edge may be stored in several active edge tables, which depends on the lifetime of each edge. It also gives us another benefit so that we can implement the multiple scanline filling in parallel for performance improvement. Experimental results show the external memory accesses of the proposed algorithm can be substantially reduced and the performance of the proposed dual-scanline filling rendering architecture can be significantly increased, especially for high-quality images. We implemented an Open VG accelerator using the dual-scanline filling rendering with one-poly four-metal 0.18[micro]m CMOS technology, which requires about 350K gates and operates at 100 MHz. Index Terms--OpenVG, active-edge search, lifetime, multiple scanlines.

Published
2008

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