나노구조 리튬이차전지 및 음극 재료의 연구동향

최지원,신동욱,윤석진,Choi, Ji-Won,Sin, Dong-Uk,Yun, Seok-Jin 한국전기전자재료학회 2007 전기전자재료 Vol.20 No.12

가야금의 실시간 음 합성을 위한 멀티코어 프로세서 구현

최지원,조상진,김철홍,김종면,정의필,Choi, Ji-Won,Cho, Sang-Jin,Kim, Cheol-Hong,Kim, Jong-Myon,Chong, Ui-Pil 한국정보처리학회 2011 정보처리학회논문지 A Vol.18 No.1

물리적 모델링은 실제 악기음과 유사한 고음질의 음을 합성하는 방법으로 많은 연구가 진행되어 왔다. 그러나 물리적 모델링은 악기의 소리를 합성할 때 필요한 수많은 파라미터들을 동시에 계산해야 하기 때문에 동시 발음수가 높은 악기의 경우 실시간 처리에 문제가 발생할 수 있다. 이러한 문제를 해결하기 위해 본 논문에서는 전통 현악기인 가야금의 음 합성 알고리즘을 실시간으로 처리 가능한 단일 명령어 다중 데이터(Single Instruction Multiple Data, SIMD) 방식의 멀티코어 프로세서를 제안한다. 제안하는 SIMD기반 멀티코어 프로세서는 가야금의 12개현을 제어하기 위해 12개의 프로세싱 엘리먼트(Processing Element, PE)로 구성되어 있다. 각각의 프로세싱 엘리먼트는 해당되는 가야금 현을 모델링하며, 각 현의 여기신호와 파라미터를 음 합성 병렬 알고리즘의 입력으로 받아 동시에 12개 현의 합성된 음을 실시간으로 생성할 수 있다. 표본화 비율을 44.1kHz로 설정하고 16비트 양자화 데이터의 음을 합성한 모의실험 결과, 제안한 SIMD기반 멀티코어 프로세서를 이용한 합성음은 원음과 매우 유사하였으며, 상용 프로세서(TI TMS320C6416, ARM926EJ-S, ARM1020E)보다 실행 시간에서 5.6~11.4배, 에너지 효율에서 553~1,424배의 향상을 보였다. Physical modeling has been widely used for sound synthesis since it synthesizes high quality sound which is similar to real-sound for musical instruments. However, physical modeling requires a lot of parameters to synthesize a large number of sounds simultaneously for the musical instrument, preventing its real-time processing. To solve this problem, this paper proposes a single instruction, multiple data (SIMD) based multi-core processor that supports real-time processing of sound synthesis of gayageum which is a representative Korean traditional musical instrument. The proposed SIMD-base multi-core processor consists of 12 processing elements (PE) to control 12 strings of gayageum in which each PE supports modeling of the corresponding string. The proposed SIMD-based multi-core processor can generate synthesized sounds of 12 strings simultaneously after receiving excitation signals and parameters of each string as an input. Experimental results using a sampling reate 44.1 kHz and 16 bits quantization show that synthesis sound using the proposed multi-core processor was very similar to the original sound. In addition, the proposed multi-core processor outperforms commercial processors(TI's TMS320C6416, ARM926EJ-S, ARM1020E) in terms of execution time ($5.6{\sim}11.4{\times}$ better) and energy efficiency (about $553{\sim}1,424{\times}$ better).

성장판의 성장에 저단계 레이저가 미치는 영향에 대한 고찰

최지원,장인수,정민정,Choi, Ji Won,Jang, In Soo,Jeong, Min Jeong 대한한방소아과학회 2015 대한한방소아과학회지 Vol.29 No.4

Objectives We aimed to identify the effectiveness of photobiomodulation using low level laser therapy (LLLT), light emitting diode (LED) and others on the growth of the length of the growth plate by reviewing literatures. Methods We searched literatures using PubMed, Science Direct, CINAHL, Korea Traditional Knowledge Portal (KTKP), Oriental Medicine Advanced Searching Integrated System (OASIS), China Knowledge Resource Integrated Database (CNKI), Japan Science and Technology Information Aggregator, Electronic (J STAGE), and Japan National Institute of Informatics Scholarly and Academic Information Navigator (CiNii) using the keywords "Growth plate" "Epiphyseal growth" "Epiphyseal plate" and "Laser", "light emitting diode (LED)", "near-infrared light", and "photobiomodulation". Search range included only original article which provided English abstract were selected. The search strategy contained no language limitation. Results A total 556 studies were found. Then, 551 were excluded by scanning titles and abstracts and finally 5 articles were selected. Five articles were RCTs using rodents. Two of the 5 articles used InGaAlP Laser (630-685 nm), and the other 3 articles used GaAlAs Laser (780, 820, and 870 nm) to investigated the effects of LLLT on the growth of the length of the epiphyseal cartilage and the number of chondrocytes and thickness of each zone of the epiphyseal cartilage. Two articles concluded that LLLT had a beneficial effect on the longitudinal growth of the growth plate. In growth of the epiphyseal plate, there were no significant differences in others. Conclusions It is might that LLLT influenced on the growth of epiphyseal plate by positive affect. However, further rigorous RCTs are warranted.

기타의 음 합성을 위한 병렬 프로세서 구현

최지원,김용민,조상진,김종면,정의필,Choi, Ji-Won,Kim, Yong-Min,Cho, Sang-Jin,Kim, Jong-Myon,Chong, Ui-Pil 한국음향학회 2010 韓國音響學會誌 Vol.29 No.3

Physical modeling is a synthesis method of high quality sound which is similar to real sound for musical instruments. However, since physical modeling requires a lot of parameters to synthesize sound of a musical instrument, it prevents real-time processing for the musical instrument which supports a large number of sounds simultaneously. To solve this problem, this paper proposes a single instruction multiple data (SIMD) parallel processor that supports real-time processing of sound synthesis of guitar, a representative plucked string musical instrument. To control six strings of guitar, we used a SIMD parallel processor which consists of six processing elements (PEs). Each PE supports modeling of the corresponding string. The proposed SIMD processor can generate synthesized sounds of six strings simultaneously when a parallel synthesis algorithm receives excitation signals and parameters of each string as an input. Experimental results using a sampling rate 44.1 kHz and 16 bits quantization indicate that synthesis sounds using the proposed parallel processor were very similar to original sound. In addition, the proposed parallel processor outperforms commercial TI's TMS320C6416 in terms of execution time (8.9x better) and energy efficiency (39.8x better). 물리적 모델링은 실제 악기음과 유사한 고음질의 음을 합성하는 방법이다. 그러나 물리적 모델링은 악기의 소리를 합성할 때 필요한 수많은 파라미터들을 동시에 계산해야 하기 때문에 동시 발음수가 높은 악기의 경우 실시간 처리에 문제가 발생할 수 있다. 이러한 문제를 해결하기 위해 본 논문에서는 기타의 음 합성 알고리즘을 실시간으로 처리 가능한 단일 명령어 다중 데이터 (Single Instruction Multiple Data, SIMD)처리 방식의 병렬 프로세서를 제안한다. 대표적인 현악기인 기타의 6개 현을 제어하기 위해 6개의 프로세싱 엘리먼트 (Processing Element, PE)로 구성된 SIMD기반 병렬 프로세서를 사용하였다. 각각의 프로세싱 엘리먼트는 해당되는 기타 현을 모델링하며, 각 현의 여기신호와 파라미터를 합성 병렬 알고리즘의 입력으로 받아 동시에 6개 현의 합성된 음을 실시간으로 생성할 수 있다. 표본화 비율을 44.1 kHz로 설정하고 16비트 양자화 데이터의 음을 합성한 모의 실험 결과, 제안한 SIMD기반 병렬 프로세서를 이용한 합성음은 원음과 매우 유사하였으며, 상용 프로세서인 TI사의 TMS320C6416보다 실행 시간에서 8.9배, 에너지 효율에서 39.8배의 성능 향상을 보였다.

영동 대설 사례를 대상으로 한 WRF Simulation의 Nudging 방법에 따른 민감도 연구

최지원(Ji Won Choi),이재규(Jae Gyoo Lee) 한국기상학회 2015 대기 Vol.25 No.1

To investigate the influences of the observational nudging and the analysis nudging on the WRF simulation for the heavy snowfall event in Yeongdong area on 26 February 2012, the sensitivity experiments in relation to nudging effects were conducted. We initially set the magnitude of nudging coefficient of 6.0 × 10<SUP>?4</SUP> s<SUP>?1</SUP> to apply to the analysis nudging experiments and observational experiments. To select the optimized options for the observational nudging, the radius influence experiment was carried out with radii ranging from 10 to 25 km at 5 km intervals. Among the observational nudging experiments, the experiment, which was conducted with the option of the radius influence of 15 km and that of the nudging coefficient of 6.0 × 10<SUP>?4</SUP> s<SUP>?1</SUP> (ONG exp.), showed a best result. As giving the nudging effect only directly on D1 and D2 brought about a better result for the analysis nudging, we set the analysis nudging experiment as above (ANG exp.). We compared and analyzed the results from the control experiment, ONG experiment, and ANG experiment to reveal nudging effects. It was found that the control experiment brought about a result that it overestimated its precipitation in comparison with the observation and failed to properly simulate the time zone of rainfall concentration. When either of the two nudging (observational and analysis nudging) was applied to the data assimilation, it brought about a better result than the control experiment. Especially the observational nudging led to a meaningful result for the wind field, while the analysis nudging had the best result for the precipitation distribution among the experiments.

Marsupialization 後 再發된 Pancreatic Pseudocyst에 關하여

崔至源(Ji Won Choi),李兒(In Lee),李康安(Kang Ahn Lee),金元明(Won Myung Kim) 대한외과학회 1965 Annals of Surgical Treatment and Research(ASRT) Vol.7 No.12

52例의 胸部外傷에 對한 臨床的 考察

崔至源(Ji Won Choi),李恩泰(Un Tae Lee),李永麟(Young Lin Lee),崔元雄(Won Wung Chio) 대한외과학회 1963 Annals of Surgical Treatment and Research(ASRT) Vol.5 No.10

일제강점기 무용가들의 안무에 나타난 민족적 정체성에 관한 연구

최지원 ( Ji-won Choi ) 대한무용학회 2019 대한무용학회논문집 Vol.77 No.2

The choreography of Koreandance, unlike foreign creative dances, has a limitation of being either ethnically Korean or just Korean. However, with the collapse of the boundary between different genres of dances in the postmodern era, ethnical choreographing has reached its limit to the point where it is impossible to distinguish from the contemporary dance. Thus, this study focuses on recognizing ethnic characteristics in the choreography of Korean creative dance.

공동체주택 공유공간 이용 및 생활규약에 따른 거주자의 공동체의식

최지원(Choi, Ji-Won),주민영(Ju, Min-Young),함유식(Ham, Yu-Sik),박경옥(Park, Kyoung-Ok) 한국주거학회 2020 한국주거학회 학술대회논문집 Vol.32 No.2

조현병 증상의 표현 분석 : 영화 〈더 보이스〉,〈블랙 스완〉을 중심으로

최지원(Ji-Won Choi) 한국콘텐츠학회 2022 한국콘텐츠학회논문지 Vol.22 No.9