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        FM 합성방식을 이용한 악기음 합성용 DSP 설계

        권민도,장호근,김재용,박주성,김형순,윤병우,백광렬,임창헌,Kwon, Min-Do,Jang, Ho-Keun,Kim, Jae-Yong,Park, Ju-Sung,Kim, Hyung-Soon,Yun, Pyung-Woo,Baek, Kwang-Ryul,Im, Chang-Hun 한국음향학회 1995 韓國音響學會誌 Vol.14 No.5

        주파수 변조(FM)의 원리를 이용하여 악기음을 합성하면, 주파수, 진폭, 변조계수 등의 파라메터들을 적절히 선택하므로써 기존의 음향 악기음과 비슷한 음을 만들 수 있다. 본 논문에서는 기존의 2 캐리어 FM 합성방식 을 하드웨어적으로 구현이 용이하게 하기 위하여 합성 파라메터 수를 제한 했다. 조작된 알고리듬을 이용하여 16개 악기음을 합성할 수 있는 DSP(Digital Signal Processor)를 $0.8{\mu}m$의 CMOS 표준 셀을 이용하여 설계하였다. 설계된 DSP가 정상적으로 악기음을 합성하는 가를 확인하기 위하여 ASIC 에뮬레이터를 이용하여 2개의 음을 동시에 합성할 수 있는 DSP를 하드웨어적으로 구현하였다. 구현된 DSP로부터 합성된 음과 실제 악기음을 주관적인 평가와 객관적인 평가를 통하여 비교한 결과 두 음이 아주 근사함을 알았다. 최종적으로 VLSI 설계툴을 이용하여 설계된 DSP를 배치 배선한 후 시간 시뮬레이션한 결과 16개 악기음을 동시에 합성할 수 있음을 확인 했다. The conventional acoustic sounds can be synthesized by Frequency Modulation which includes the variation of frequency, amplitude, and modulation index. In this paper the number of variable synthesis parameters are limited to easily implement the existing two carrier FM algorithm by hardware. The DSP(Digital Signal Processor), which is able to carry out the modified algorithm and synthesize 16 sounds at a time, is designed with $0.8{\mu}m$ standard sells. The DSP which can synthesize 2 sounds at a time is implemented by ASIC emulator to examine the sound quality of the designed DSP. Through the objective and subjective estimation, it is confirmed that the sounds of many instruments from the implemented DSP are very closed to their real sound. Finally the designed DSP is layouted and simulated by VLSI desgn tool. According to the simulation, the designed DSP has the sufficiently fast speed for synthesizing 16 sounds at a time.

      • KCI등재

        A Study of Children's Meaning Making of Literary Elements: Focusing on Plot, Theme, and Characters

        권민 한국유아교육학회 2011 INTERNATIONAL JOURNAL OF EARLY CHILDHOOD EDUCATION Vol.17 No.1

        This study was designed to describe how preschool and kindergarten children made sense of a story by analyzing their responses to plot, theme and characters. This study proposes that childrens character understanding is closely related to their understanding of plot and theme. Ninety four preschool and kindergarten children and sixty four college sophomores participated in reading aloud and responding to activities from the book, The Tunnel by A. Browne (1989). The participants were individually interviewed about how they understood the literary elements. The interview questions were developed with reference to Lehr (1991), Roser, Martinez, Fuhbrken & McDonnold (2007), and Sloan (2003) in order to understand childrens understanding of plot, theme and character. Transcribed responses were coded in traits related to plot, theme and character. The responses of the college students were used to understand the adult point of view on literary meaning making. From the present study, it is evident that young childrens meaning making of literary elements is different from adults. Further, it is different even among young age groups. When a childs age gets to 5, his/her understanding of character becomes more merged with events and plots, which are similar to that of an adult. However young childrens understanding of psychological or internal aspects of character, of which understanding guarantees sense of theme and plot remains to be developed later. From this study, it seems reasonable to suggest that plot and theme becomes comprehensible through deeper understanding of characters.

      • KCI등재

        알칼라인 수전해 산소 발생 반응을 위한 NiCo<sub>2</sub>O<sub>4</sub>/Ni foam 전극 제조 및 특성 평가

        권민,고재성,이예솔,이성민,유지수,이효원,송성호,이동주,Kwon, Minsol,Go, Jaeseong,Lee, Yesol,Lee, Sungmin,Yu, Jisu,Lee, Hyowon,Song, Sung Ho,Lee, Dongju 한국분말재료학회 (*구 분말야금학회) 2022 한국분말재료학회지 (KPMI) Vol.29 No.5

        Environmental issues such as global warming due to fossil fuel use are now major worldwide concerns, and interest in renewable and clean energy is growing. Of the various types of renewable energy, green hydrogen energy has recently attracted attention because of its eco-friendly and high-energy density. Electrochemical water splitting is considered a pollution-free means of producing clean hydrogen and oxygen and in large quantities. The development of non-noble electrocatalysts with low cost and high performance in water splitting has also attracted considerable attention. In this study, we successfully synthesized a NiCo<sub>2</sub>O<sub>4</sub>/NF electrode for an oxygen evolution reaction in alkaline water splitting using a hydrothermal method, which was followed by post-heat treatment. The effects of heat treatment on the electrochemical performance of the electrodes were evaluated under different heat-treatment conditions. The optimized NCO/NF-300 electrode showed an overpotential of 416 mV at a high current density of 50 mA/cm<sup>2</sup> and a low Tafel slope (49.06 mV dec<sup>-1</sup>). It also showed excellent stability (due to the large surface area) and the lowest charge transfer resistance (12.59 Ω). The results suggested that our noble-metal free electrodes have great potential for use in developing alkaline electrolysis systems.

      • KCI등재

        漢初 鼂錯의 改革과 對 匈奴 政策의 변화

        권민 부경대학교 인문사회과학연구소 2020 인문사회과학연구 Vol.21 No.2

        漢 帝國은 文帝, 景帝 시기를 거치면서 여러 가지 난제에 직면했다. 이 가운데 해결해 야 할 가장 중요한 문제 두 가지가 바로, 황실을 위협하는 강한 同姓諸侯 세력을 제압하 는 것과 북쪽에서 압박해 오는 흉노를 방어하는 것이었다. 文・景帝 때 鼂錯의 改革 조치 는 武帝 때 漢이 對外政策을 수정하고 수립하는 데 중요한 방법적・제도적 기초를 마련해 주었다. 鼂錯가 제시한 국방 정책 개혁 방안은 크게 네 가지로 요약할 수 있다. 첫째, 鼂錯는 흉노 기병에 맞설 새로운 군대를 양성하고자 했다. 우선 전쟁에 능한 지 휘관을 양성할 것을 강조하였다. 또 흉노의 長技와 한의 長技를 거론하면서 상황에 따른 병기 운용의 중요성을 이야기하였고, 전투 지형에 따라 부대를 선택적으로 활용해야 하 는 점을 강조했다. 이후 漢은 전적으로 騎兵만을 운영하기도 하고 지형에 따라 騎兵과 步 兵을 함께 운영하기도 했다. 한의 군대 체제 개편에 있어서 조조의 논의가 상당부분 반영 되었다는 사실은 무시할 수 없다. 둘째, 변경 방어 및 흉노 공략에서 이민족을 이용해야 한다는 정책 건의는 武帝 때 동북아 및 서역 제국에 대한 外交의 필요성 측면으로 확대되 었다. 무제가 동쪽으로 東胡・朝鮮을 유인하고, 북쪽으로 烏孫과 연합하고, 서쪽으로 서 역 여러 나라와 동맹을 맺기 위해 노력한 일은 본국의 국력을 소모하기보다 외국 세력을 이용해야 한다는 조조의 논의와 일맥상통한다. 셋째, 이른바 조조의 ‘徙民實邊’ 정책은 실제로 文帝에 의해 이행되었으며, 이후 武帝 시기 西域 진출에 이 방법을 적극 활용하여 변경의 內地化에 기여했다. 넷째, 둔전 설치는 漢 군대의 단점이었던 遠征에서의 보급문 제에 도움이 되었다. 漢 군대는 흉노 원정에서 보급 문제로 李陵, 李廣利 등 여러 장군을 잃는 등 군대의 한계를 끝내 극복하지 못했지만, 둔전은 주둔과 방어에는 매우 효과적이 었다. 漢初, 賈誼를 비롯한 여러 정치가가 한이 직면했던 여러 문제를 해결하기 위해 각자 의견을 제시하지만 논의의 구체성과 실행 가능성에서 조조보다 자세한 자는 없었다. 조 조의 논의는 분명하고 논리적인 데다 구체적이었다. 文・景帝 시기를 거치면서 漢이 국방 정책에서 자립하고, 武帝가 동아시아 국제 정치에서 주도권을 보유하게 되는 일련의 역 사적 과정을 설명하는 데 조조의 개혁을 제외하고 설명하기 어려울 것이다. 漢初 역사에서 鼂錯에 주목해야 하는 이유는 바로 여기에 있다. The Han Dynasty faced with various problems from the beginning time. The two most important problems the Empire had to solve were to suppress the forces threatening the royal family and the Huns defending the northern oppression. Zhao Cuo[鼂錯]'s reform, during the period of Emperor Wu, provided an important method and institutional basis for the rectification and establishment of an exterior policy. The reform plan of national defense policy proposed by Zhao Cuo can be summarized into four aspects. First, Zhao Cuo wanted to cultivate a new army against the Huns cavalry. First of all, it emphasizes the cultivation of commanders who are good at war. At the same time, it also mentioned the importance of weapon application and emphasized the characteristics of choosing troops according to the fighting terrain. For the reorganization of the Han Dynasty’s military system, Zhao Cuo's discussion reflects a considerable part of the facts. Second, the policy of using immigrant tribes to defend and attack the Huns has expanded to the aspect of the need for diplomacy in Northeast Asia and the Western Regions. WuDi[武帝]'s Alliance of the "Dong Hu[東胡]" to the east, confederate with the "Wu Sun[烏孫]" to the north, and alliance with several western countries to the west are in line with Zhao Cuo's discussion that foreign forces should be used. Third, Zhao Cuo's pllicy of Immigrate to the border[徙民實邊政策] was actually implemented by the emperor, and later, Wu-Di actively utilized this method when it advanced to various western countries. Fourth, Zhao Cuo's Land reclamation for the establishment of a war-fighting system helped the supply of the troops. It would be difficult to explain, except for the reform of the Zhao Cuo, to explain a series of historical processes in which Han Dynasty[漢帝國] on his own feet in defense policy and Wu Di[武帝] takes the initiative in international politics in East Asia. This is why we should pay attention to Zhao Cuo in history.

      • KCI등재

        오래 경과된 외상성 안구함몰의 치료

        권민,김정근,배기범,권재환,조중환 대한이비인후과학회 2007 대한이비인후과학회지 두경부외과학 Vol.50 No.2

        Background and Objectives:Enophthalmos is a comon sequelae of orbital fracture. Moreover, it is difficult to treat second-arily. We assessed the effect of filling up the orbital volume defect with implants on the correction of late posttraumatic enoph-thalmos. Subjects and Method:because of late postraumatic enophthalmos from July 2001 to December 2005. To corect late posttraumatic enophthalmos, porous polyethylene (Medpor), Medporenophthalmos wedge implant, absorbable mesh, bone graft particulate, rib cartilage, auricle cartilage, and maxilla anterior wall were used. Results:Among 11 patients, 6 patients were men and 5 patients were women. The average age was 33.2 years with the follow-up period of 21.8 months. Five patients had orbital floor fracture, 1 3 patients had zygoma fracture. Excellent results were obtained in all 5 patients with diplopia. The amount of enophthalmos corrected was between 1 and 5 mm (mean 2.5 mm). There was no case of visual loss, infection, migration, or exposure of implant, but we caried out re-operation on 1 case due to over reduction. Conclusion:Filling up the volume defect with proper implants is a relatively simple, safe and efficient technique in corecting late posttraumatic enophthalmos. (Korean J Otolaryngol 2007;50:128-33)

      • KCI등재

        Korean Preschoolers' Use of Literate Language Features in Spoken Narratives

        권민,이숙희 한국유아교육학회 2008 INTERNATIONAL JOURNAL OF EARLY CHILDHOOD EDUCATION Vol.14 No.2

        This study was carried out to examine Korean preschoolers' use of literate language usage in oral narratives of a wordless picture book. 315 preschoolers aged from 3-, 4- and 5-year-olds' narratives were coded for literate language features, which were elaborated noun phrases, adverbs, conjunctions, mental verbs and linguistic verbs. The results of this study showed that literate language features were present in preschool children's narratives, and that the usage rate for the most of features varied significantly across the preschool age group. The oral narratives of 3-year-old children contained fewer adverbial phrases and conjunctions than the oral narratives of 4- or 5-year old children. Additionally, the narratives of 3-or 4-year old children contained fewer simple and complex noun phrases, adverbs and linguistic verbs than the narratives of 5-year-old children. It seems that most of the literate language features in Korean preschoolers develop distinctively at age 5. The results of the gender difference investigation showed no difference for literate language features. Korean preschoolers' use of literate language in spoken narratives not only converge on the previous results from American young children, but also show unique literate language use.

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