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        • KCI등재

          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).

        • KCI등재

          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.

        • KCI등재

          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.

        • KCI등재

          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.

        • KCI등재

          자연언어 문장의 자동 변환을 위한 수화 표현의 언어학적 특성 분석

          최지원 ( Ji Won Choi ),장은영 ( Eun Young Chang ),이희진 ( Hee Jin Lee ),박종철 ( Jong C. Park ) 한국언어정보학회 2006 언어와 정보 Vol.10 No.1

          The linguistic characteristics of a sign language provide an important clue for an automatic construction of its expression from a given natural language sentence. For such characterization, we focus on the identification of elided constituents, the mapping of property-changing information into spatio-temporal dimension, and the need for rearranging the order of component information for enhanced quality of delivery. We use our characterization to implement a system that converts sentences in Korean into corresponding expressions in the Korean Sign Language. (Korea Advanced Institute of Science and Technology)

        • KCI등재

          학교부적응청소년의 MMPI-A 특성 및 학교생활적응수준

          최지원(Ji Won Choi),박영숙(Young Sook Park) 한국청소년학회 2011 청소년학연구 Vol.18 No.9

          본 연구는 학교부적응청소년들의 심리적 특성과 학교생활적응수준을 평가하고자 하였다. 연구는 학교부적응문제로 상담 받고 있는 남녀 중·고등학생 132명과 일반 중·고등학생 119명을 대상으로 진행되었다. 검사 도구는 MMPI-A와 학교생활적응척도를 사용하였다. 연구결과, 학교부적응청소년집단은 첫째, MMPI-A에 있어 타당도척도 F, 임상척도 Hs, D, Hy, Pd, Pa, Pt, Sc, Ma, Si, 내용척도 A-aln, A-con, A-las, A-sch 그리고 보충척도 ACK, PRO, IMM 등이 유의미하게 높은 점수를 보였다. 둘째, 학교생활적응척도에 있어 유의하게 낮은 점수를 나타냈으며, 특히 여자학교부적응청소년의 경우, 학교생활 전 영역에 있어 유의하게 낮은 적응수준을 나타냈다. 셋째, MMPI-A 특성과 학교생활적응수준과의 관계에서는 교사와의 관계에 잘 적응하지 못하는 경우 A-las, A-sch, IMM척도가, 교우관계에 잘 적응하지 못하는 경우 D, Pa, Pt, Si, A-aln척도가, 수업에 잘 적응하지 못하는 경우 Pd, A-con, A-las, A-sch, PRO, IMM척도가, 마지막으로 규칙에 잘 적응하지 못하는 경우 A-con, A-sch, PRO척도가 높았다. 이러한 결과는 학교부적응청소년에 대한 상담적 개입에 있어 이들의 심리적 특성 및 성차, 그리고 학교생활적응수준 및 부적응영역에 따른 개별화된 전략이 필요하다는 점을 시사해준다. The purpose of the study was to examine and evaluate the psychological characteristics and School Adjustment level of the school maladaptation students using MMPI-A and the scale of School Adjustment. The findings were as follows: First, the school maladaptation students showed the significant differences in the scales of F, Hs, D, Hy, Pd, Pa, Pt, Sc, Ma, Si, A-aln, A-con, A-las, A-sch, ACK, PRO, and IMM. Especially, A-sch, PRO in the female school maladaptation students were clinically elevated. Second, School Adjustment level of the school maladaptation students was all low. Particularly, School Adjustment level of the female school maladaptation students was significantly low in all parts of school. Third, there was a significantly negative correlation between the adaptation to school(teachers, friends, classes, and regulations) and Pd, D, Pt, Si, A-aln, A-las, A-con, A-sch, PRO, and IMM. These results implied the school maladaptation students had the high possibilities of experiencing the psychological and behavior difficulties in their schools. Therefore, school should try to prepare many pre and post counseling programs according to their gender and various types of school maladaptation.

        • KCI등재

          바스켓(Basket)의 형태미와 하프 놋팅(Half-knotting)기법의 결합을 응용한 패션디자인 연구

          최지원(Ji-Won Choi),김정혜(Jung-Hae Kim) 한국니트디자인학회 2015 패션과 니트 Vol.13 No.3

          This study applied physical beauty in curves of baskets into design. It is created fashion designs with unique forms expressing three-dimensional sense of space found in baskets. Moreover, I developed and applied new material techniques by combining half-knotting technique to fix by knotting with winding basket-manufacturing technique in order to express the penetrative beauty of baskets. Accordingly, this study reviewed a concept of baskets and a variety of techniques and looked at the beauty of the forms of baskets. Next, it is reviewed half-knotting technique. Based on such theoretical background, I aimed to connect the sense of three-dimensional space and penetrative nature into fashion design by applying the beauty of basket forms. In producing artworks, I used subsidiary materials such as wires as wrapped steak and artificial leather as strands to create fashion design based on structures that are both functional and flexible to allow movement. This study is to apply the characteristics of the curved body from the basket’s beauty of shape as the representation of three-dimensional spaciousness. In addition, when the curved form of baskets is applied in fashion, it could be confirmed that it holds the infinite value of artistic expression as a design. Hopefully, a new material technique will be applied in the future and developed further variously if on-going studies may combine the beauty of shape with fashion.

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