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).

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

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.

건강신념모델에 기초한 성인여성의 모발염색 행위에 관한 연구

최지원 ( Ji-won Choi ),장창곡 ( Chang-gok Chang ) 한국미용학회 2018 한국미용학회지 Vol.24 No.2

As society advances and develops, people show a keen interest in their appearance. In fact, appearance is a critical element that makes a person’s personality stand out and makes him/her more confident in interpersonal relationships. In particular, hair style plays a key role in determining a person’s impression and appearance. Hair dyeing is an important element in hairstyling. It has become more diverse as self-presentation and social activities become more important. In terms of a treatment that sends the chemical ingredient of a hair dye, there are beauty salon hair dyeing and self-hair dyeing. With people’s high interest in appearance, a variety of hair dyes have been released and distributed through diverse channels. This expansion of distribution channels and changes in media environments have accelerated unproven hair dyeing practices and caused some problems such as health hazards and side effects. The awareness of the fact that hair dyeing is harmful to human health strengthens the ‘health belief’. In contrast, appearance care through hair dyeing and desire to express personality can violate this health belief. Therefore, there has been a need for a method that can retain the health belief about hair dyeing and, at the same time, satisfy the desire for hair dyeing by minimizing damage from the hazards of hair dyes. This study determined factors affecting the possibility of health behavior in hair dyeing through a hair dyeing survey and analysis based on such perception. According to the study results, the causality that determines the selection of self-hair dyeing or beauty salon hair dyeing within the level of the awareness of health belief can be derived. If interest in benefits, perceived barriers and health increases, there is a greater possibility of selecting beauty salon hair dyeing, which is deemed to be safer. As stated above, this study analyzed correlations between hair dyeing and health belief. It is significant in that it is a case of HBM measurement on hair dyeing. In other words, this study provides the ground for consumers to select and judge safe hair dyeing practices.

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