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YDK : 한국어 통합정보사전 개발 시스템의 설계 및 구현
최용준(Yongjun Choi),황도삼(Dosam Hwang),최기선(Keysun Choi) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.2Ⅱ
본 논문에서는 다국어 통합정보사전 구축을 위한 한국어 용언의 통합정보사전을 구축하기 위해 정립된 사전개발 시스템의 개발 방법론을 바탕으로 한 통합정보사전개발 시스템(TDK: Yongjun Dosam Keysun)을 설계하고 구현한다. 개발한 TDK는 기존의 각종 사전의 다양한 사전정보를 통합할 수 있을 뿐 아니라 여러 자연언어처리 시스템들과의 접속을 통해 언어처리를 위한 사전정보를 손쉽게 통합할 수 있어 고품질의 전자사전을 개발할 수 있다.
황수진(Sujin Hwang),황철현(Chulhyun Hwang),박용준(Yongjun Park) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.1A
방송과 관련된 디지털 기술과 통신 기술의 급격한 발전은 방송 산업의 다양화와 컨텐츠의 수적 증가를 유도한 반면 시청자의 시청 환경을 고려하는 편의성과 최적 정보 전달 기술의 발전은 더디게 진행되어왔다. 본 논문에서는 국내에서 최근 상용 서비스가 실시된 양방향 TV 환경에서 양방향 방송 서비스를 제공하고, 시청자의 행위, 선호도, 성향 등을 분석하여 개인화된 프로그램 채널 추천, 표적화된 광고의 제공, T-Commerce 환경을 지원할 수 있는 양방향 TV 개인화 시스템을 설계하고 구현한다.
Writing on Dirty Flash Memory: Combating Inter-Cell Interference via Coding with Side Information
Yongjune Kim,Euiseok Hwang,B. V. K. Vijaya Kumar 한국통신학회 2022 Journal of communications and networks Vol.24 No.6
High-density flash memories suffer from inter-cell interference (ICI) which threatens the reliability of stored data. In order to cope with the ICI problem, we propose a channel coding scheme with channel state information of flash memories (i.e., side information of ICI). This side information is obtained before writing data into flash memories and incorporated during the encoding stage. We show that flash memories under ICI problem can be transformed into the model of memory with defective cells due to the unique asymmetry property between write (page write) and erase (block erase) operations. Then, the channel coding for memory with defective cells is employed to combat ICI. Simulation results support that the proposed scheme with the ICI side information can effectively improve the decoding failure probability.
다양한 열습환경하에서 최외각층 변화에 따른 CFRP 모자형 부재의 압궤특성
양용준(Yongjun Yang),황우채(Woochae Hwang),양인영(Inyoung Yang) 한국생산제조학회 2014 한국생산제조학회지 Vol.23 No.3
Currently, CFRP composites are rapidly replacing steel plates, as they are lighter, stronger, and more elastic; however, they are poorly suited to hygrothermal and impact-collapsed environments because moisture can alter their molecule arrangement and chemical properties. In this study, environments are experimentally simulated in order to investigate changes in the moisture absorption inside a CFRP composite and to determine its weakest point. Moreover, changes in the moisture absorption ratio at temperatures of 60°C and 80°C are studied and compared in order to understand how changes in temperature affect moisture absorption inside CFRP composites. Results show that moisture absorption leads to a strength reduction of around 50%. In addition, the moisture absorption rate inside CFRP composites is shown to change rapidly with increasing temperature. Accordingly, it showed that the change in matrix also has a weak point.
Cha, Yongjun,Kim, Hwang‐,Phill,Lim, Yoojoo,Han, Sae‐,Won,Song, Sang‐,Hyun,Kim, Tae‐,You John Wiley and Sons Inc. 2018 Molecular Oncology Vol.12 No.7
<P>Although regorafenib has demonstrated survival benefits in patients with metastatic colorectal and gastrointestinal stromal tumors, no proven biomarker has been identified for predicting sensitivity to regorafenib. Here, we investigated preclinical activity of regorafenib in gastric and colorectal cancer cells to identify genetic alterations associated with sensitivity to regorafenib. Mutation profiles and copy number assays of regorafenib target molecules indicated that amplification of fibroblast growth factor receptor 2 (FGFR2) was the only genetic alteration associated with <I>in vitro</I> sensitivity to regorafenib. Regorafenib effectively inhibited phosphorylation of FGFR2 and its downstream signaling molecules in a dose‐dependent manner and selectively in FGFR2‐amplified cells. Regorafenib induced G1 arrest (SNU‐16, KATO‐III) and apoptosis (NCI‐H716); however, no significant changes were seen in cell lines without FGFR2 amplification. In SNU‐16 mice xenografts, regorafenib significantly inhibited tumor growth, proliferation, and FGFR signaling compared to treatment with control vehicle. Regorafenib effectively abrogates activated FGFR2 signaling in FGFR2‐amplified gastric and colorectal cancer and, therefore, might be considered for integration into treatment in patients with FGFR2‐amplified gastric and colorectal cancers.</P>
주화성에 의한 활동성 정자 분리용 마이크로 바이오칩에 관한 연구
고용준(Yongjun Ko),맹준호(Joon-Ho Maeng),안유민(Yoomin Ahn),황승용(Seung Yong Hwang) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.12
This paper presents a new microchip which can separate motile sperm by chemotaxis. The microchip was developed to create longitudinal concentration gradient in the microchannel due to diffusion. Linearly good concentration gradient of chemoattractant was generated without any fluid control devices. In sperm separation experiment with the developed microchip, mouse sperm was used as sample and acetylcholine was selected as chemoattractant. Human tubal fluid (HTF), buffer solution, was introduced into the microchannel of the microchip and attractants diluted in ratio of 1, 1/2, 1/4, 1/8, 1/16, 1/32 and 1/64 including control (DI water) were dropped in each outlet by 2 ㎕ volume with micropippet. After 5min, 1 ㎕ sperm solution was dropped into inlet of the chip. After 10 min, when sperms reached to the outlet by chemotaxis, we counted sperms in each outlet by using microscopy. Consequently, we could separate progressive motile sperm with the new microchip. In the experiment, the most sperms were isolated at the outlet dropped with 1/16 diluted solution. The optimal concentration gradient to induce chemotaxis was about 0.625 ㎎/㎖/㎜.
The use of ultrasound to reduce internal concentration polarization in forward osmosis
Choi, Yongjun,Hwang, Tae-Mun,Jeong, Sanghyun,Lee, Sangho Elsevier 2018 Ultrasonics sonochemistry Vol.41 No.-
<P><B>Abstract</B></P> <P>Unlike reverse osmosis (RO) that is dominated by the hydraulic pressure differential, forward osmosis (FO) uses the osmotic pressure gradient as the driving force between a dilute feed solution and a concentrated draw solution across a membrane. High pressure is not required in FO, which means that FO can be used as an alternative to RO as an energy-saving separation process in desalination technology. However, a major limiting factor of the FO process is the internal concentration polarization (ICP). Because of the stagnant environment inside the porous supporting layer of a FO membrane, it is difficult to mitigate the ICP by simply increasing the shear stress or promoting turbulence. In this study, the ICP is reduced by ultrasound. The effect of the ultrasound frequency and output power on the ICP coefficient is investigated in a flat-sheet FO membrane module with counter-current flow. The ultrasound frequency and output power are varied between 25, 45, and 72 kHz and over the range of 10–70 W, respectively. NaCl solution is used as both the feed and draw solution. The results illustrate that moderate ultrasonic irradiation is effective for reducing the ICP in a FO process. A modified solution–diffusion model based on film theory is used to assess the effect of ultrasound on the ICP in a FO process. The ICP coefficient is estimated using this model.</P>
에너지 흡수 제어에 의한 Al 박육부재의 축 압궤 특성
양용준(Yongjun Yang),황창숙(Changsook Hwang),김선규(Sunkyu Kim),심재기(Jeaki Sim),양인영(Inyoung Yang) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Automobiles must be designed to control characteristics of energy absorption for the protecting of passengers in a car accident. Study on collapse characteristics of structural member is conducted in parallel with other studies on effective energy absorption capacity of structural members with diverse cross-sectional shapes and various materials. This study concerns the crashworthiness of the widely used vehicle structural members, thin-walled tubes, which are excellent on the point of the energy absorption capacity. The absorbed energy, mean collapse load and deformation mode were analyzed for side member which absorbs most of the collision energy. The Energy Absorption Capacity of AI thin-walled tubes have been estimated on cases of with-controller and without-controller, respectively based on height, thickness of an controller. The absorbed energy and mean collapse load of thin-walled tubes was increased by 15-20% in using the controller and energy absorbing capability of the specimen was slightly changed by change of the high controller's height.