신경망을 이용한 우리말 음성의 인식에 관한 연구 - 복합 신경망을 이용한 초성자음 인식에 관한 연구

김석동,이행세,Kim, Suk-Dong,Lee, Haing-Sei 한국음향학회 1992 韓國音響學會誌 Vol.11 No.3

본 논문은 신경망을 이용한 자음인히기에 관한 연구이다. 우선 자음과 모음이 포함된 음성에서 자음부분을 분리하였다. 각각의 자음을 몇개의 집단으로 나누어서 자음구간대 영교차율을 조사하였다. 마지막으로 자음을 인식하기 위해 제어망과 몇개의 소규모 망으로 구성한 혼합 신경망을 제안한다. 제어망은 입력된 자음이 어느 집단에 속하는가를 결정하고, 소규모망에서는 각 집단에 속하는 자음을 인식한다. This paper is a study on the consonant recognition using neural network. First, the part of consonant was separated from the sound of vowel and consonant by the use of acoustic parameter. The rate of length vs. zero crossing rate in the sound of consonant had been studied by dividing each consonant into several groups. Finally, for the purpose of consonant recognition, the composite neural network which consists of a control network and several sub-network is proposed. The control network identifies the group to which the input consonant belongs and the sub-network recognizes the consonant in each group.

학회순례 - 창립 40돌 농업발전에 크게 기여 "한국작물학회"

김석동,Kim, Seok-Dong 한국과학기술단체총연합회 2002 과학과 기술 Vol.35 No.7

도협칼럼 - 문화와 공공도서관

김석동,Kim, Seok-Dong 한국도서관협회 2000 圖協會報 Vol.41 No.6

0.36Mn이 함유된 구상흑연주철의 냉각조건에 따른 기계적 거동 고찰

김석동,김성규,Kim, Suck-Dong,Kim, Sung-Gyoo 한국주조공학회 2021 한국주조공학회지 Vol.41 No.4

Effects of cooling condition after solidification on the microstructure and the mechanical properties of 0.36Mn containing ductile cast iron have been studied based on the minimized addition of Cu and Sn for vehicle component applications with better quality and cost competitiveness. Cu and Sn were selected for additional elements judging from the well-known fact of strong tendency of pearlite promotion followed by the tensile property improvement. After pouring of the Mg treated cast iron melt with various chemical compositions into the block specimens, two ways of post solidification cooling conditions were applied for comparison; both cooling in the mold and cooling in the air after dismantle at 800℃. The pearlite fraction of the mold-cooled specimens was analyzed as 27-44%, with the tensile strength and elongation of 513-568N/mm² and 10.4-14.3%, respectively. Whilest, the air cooled specimens showed the pearlite fraction of 77~85%, with the tensile strength and elongation of 728~758N/mm² and 3.2~6.0%, respectively. It is worthwhile to note that the remarkable improvement of both tensile strength and elongation of the ductile iron was achieved by the present air cooling condition with the minimized combined addition of Cu and Sn to the 0.36Mn containing ductile iron. 우수한 기계적 성질과 가격경쟁력을 갖는 구상흑연주철 합금 개발을 위해 Cu와 Sn을 소량 첨가한 고 Mn 구상흑연주철의 응고 후 냉각조건에 따른 미세조직과 기계적 특성을 분석하였다. 첨가원소인 Cu와 Sn의 경우 펄라이트 형성 촉진을 통한 인장특성 향상을 위해 선택하였다. 또한 물성에 미치는 냉각속도의 영향을 확인하기 위해, Mg 처리된 다양한 조성의 합금을 블록시편에 주입한 후 주형 내 냉각과 800℃에서 주형 해체 후 공랭의 두 가지 냉각 조건을 비교분석하였다. 주형 내 냉각 시편의 경우, 펄라이트 분율은 27-44%, 인장강도와 연신율은 각각 513-568N/mm²와 10.4-14.3%로 나타났다. 반면, 이른 형해체 공랭 시편의 경우에는 펄라이트 분율은 77~85%, 인장강도와 연신율은 각각 728~758N/mm²와 3.2~6.0% 이었다. 결론적으로, 소량의 Cu 및 Sn 함유 Mn 구상흑연주철의 공랭 시 괄목할만한 인장강도와 연신율의 증가를 확인할 수 있었다.

율무 박피 다수성 선발 계통의 생육 및 종실특성

이정일(Jung Il Lee),박장환(Jang Hwan Park),김석동(Sok Dong Kim),안병옥(Byeong Ok Ahn),이승택(Seung Tack Lee) 한국약용작물학회 1993 한국약용작물학회지 Vol.1 No.1

This study was conducted to select thin-shelled and high-yielding lines in job`s-tears. Two breeding lines of Suwon 3 and Suwon 6 were selected from the local collections. These two lines were tested and investigated on their characteristics under the field condition. The heading date of Suwon 3 and Suwon 6 was later one or two days, but the maturity date was one or two days earlier than that of check variety Kim-jejong, respectively. The number of grains per hill of Suwon 3, Suwon 6 was 50%, 49% greater and the milling rate was 3.8%, 5.6% higher than that of check variety, respectively. Althought 1000 grain weight of Suwon 3 and Suwon 6 was 20g lighter and the rate of ripeness was 6%, 12% lower, the raw grain yield was 22%, 20% higher than that of check variety, respectively. The thickness of seed coat of Suwon 3 and Suwon 6 was thiner and the hardness of seed coat was lower than that of check variety, therefore the milling time was decreased 12%, 7% compare to check variety, respectively. The crude protein contents of Suwon 3 and Suwon 6 was slightly higher and the amino acid composition of Suwon 6 was similar to Kimjejong, but Suwon 3 was lower than that of check variety.

고속철도 뜬침목 발생량에 대한 정량적 연구

김석동(Kim Suk-Dong),박용걸(Park Yong-Gul),김대상(Kim Dae-Sang),김학균(Kim Hark-Kyun) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-

Floating sleepers in a ballasted track increase both track deterioration and track irregularities. Consequently, a considerable maintenance work is required and maintenance cycle is shortened due to the floating sleepers. This paper quantifies the degrees of void between the floating sleepers and a ballast bed. In the future, the influence of floating sleepers on the track will be investigated by an analytical method using a dynamic model.

자갈궤도 뜬침목 간이 평가 방법

김대상(Kim Dae Sang),김현기(Kim Hyun Ki),이태균(Lee Tae Gyun),김석동(Kim Seok Dong),김성중(Kim Sung Jung) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-

Hanging sleepers, which are not fully supported between the sleepers and the ballast, could cause large dynamic forces especially on high speed ballasted track. The dynamic forces resulting from insufficient supporting forces may badly affect the running stability and safety of train. These also accelerate track irregularities and deteriorate track components rapidly. Consequently, thehanging sleepers will lead to sharp increases in track maintenance cost. This paper introduces a rapid and easy method to detect hanging sleepers with portable light falling weight deflectometer (LFWD) and summarizes the results of experiments performed at the high speed ballasted track.

Conservative Corporatism of Developmental States: One Common Outcome of Low Inequality Between Conservative and Social Democratic Corporatism

김석동 ( Seokdong Kim ) 한국행정학회 2022 한국행정학회 학술발표논문집 Vol.2022 No.2

My research provides a conceptualization of conservative corporatism compared to social democratic corporatism and, by extension, proposes a typology of the developmental state compared to the welfare state. Developmental states, such as Japan, South Korea, and Taiwan, maintained low inequality in the long term during rapid industrialization despite weak welfare regimes and low social expenditures. Why have both East Asian developmental states and European corporatist states commonly maintained long-term low inequality despite their contrasting ideologies of conservativism versus social democracy respectively? Developmental states have created state-led asymmetric coordination with firms but without labor. Both conservative corporatism and social democratic corporatism differ in the formation of the conservative welfare state and the social democratic welfare state respectively, but both have commonly maintained long-term low inequality. Developmental states’ conservative corporatism maintained egalitarianism with progressive land reforms, near-full employment, and educational improvement despite the absence of institutionalized welfare regimes. Social democratic corporatism can promote the state’s inclusiveness by sustaining a broad consensus between classes and, by extension, provide a roadmap for the inclusive state to realize economic democratization and to overcome inequality caused by the COVID-19 pandemic.

한국형 발전국가에서 사회적 다원화와 불평등에 따른 합의 민주주의의 요구 세계화와 외환위기 및 코로나19 이후에 ‘민주주의의 질’ 성찰

김석동(Kim, Seok-Dong) 서강대학교 현대정치연구소 2021 현대정치연구 Vol.14 No.1

민족적 동질성과 사회경제적 평등은 다수결 민주주의가 형성되는데 우호적인 조건이다. 반면 사회적 다원화와 불평등이 증가하게 되면 다수결 민주주의보다는 합의 민주주의가 대표성을 향상하여 민주주의의 질을 더 효과적으로 개선할 수 있다. 한국사회가 세계화와 외환위기 이후에 사회적 다원화와 사회경제적 불평등을 경험하면서, 경제민주화를 반영할 수 있는 합의 민주주의로 정치개혁의 요구가 거세지고 있다. 세계화 이후에 한국은 민족적 동질성의 약화와 함께 외국인과 탈북자 유입의 증가로 인해 사회적 다원화의 경향이 점차 강해지고 있다. 아울러 한국은 국가건설 초기에 평등한 사회였으나, 1997년 외환위기 이후의 저성장 시대에 특히 2020년 이후의 코로나19 대유행의 국면에 사회경제적 차원에서 불평등한 사회로 전환되고 있다. 게다가 한국의 급속한 산업화 과정에서 서울과 수도권 중심의 경제발전으로 인해 중앙과 지방 간의 양극화가 심해지고 있다. 이와 같은 사회경제적 불평등은 선거에서 현저한 쟁점으로 부상해왔으며, 반(半)다원적 사회로의 전환은 잠재적 쟁점이다. 이에 따라 한국 정당과 시민사회는 보편적 복지국가와 경제민주화 의제를 개헌 등의 담론을 통해 제기해왔다. Ethnic homogeneity and socioeconomic equality are conditions favorable for the formation of majoritarian democracy. Meanwhile, as social pluralization and inequality increase, consensus democracy can enhance the quality of democracy more effectively through enhancing representation than majoritarian democracy. As Korean society experiences social pluralization and socioeconomic inequality after globalization and the financial crisis, there is an increasing demand of political reforms for consensus democracy that reflects multiculturalism and economic democratization. Since globalization, South Korea has become increasingly more plural due to the weakening of ethnic homogeneity, as well as the increasing influx of ethnic minorities, foreigners, and North Korean defectors. Furthermore, during state building, South Korea was an egalitarian society, but is rapidly transforming into an unequal society in the socioeconomic dimension during the era of low economic growth after the financial crisis, particularly in the post-2020 COVID-19 pandemic. Moreover, during Korea’s rapid industrialization period, polarization between center and periphery has intensified due to economic development centered on Seoul and the metropolitan area. This socioeconomic inequality has emerged as a salient issue in elections, and the transition to a semi-plural society is a potential issue. Accordingly, Korean political parties and civil society have raised agendas of universal welfare state and economic democratization through discourse such as constitutional amendment.

시공간 특성을 이용한 지역명 인식에 대한 연구

김석동(Suk dong Kim) 호서대학교 중앙도서관 1993 호서대학교 논문집 Vol.1 No.-

This paper is about an experiment of speaker-dependent automatic Korean spoken words recognition using Multi-Layered Perceptron and Error Back-propagation algorithm. The object words are 50 citynames of D.D.D. local numbers. 43 of those are 2 syllables and the rest 7 are 3 syllables. The words were not segmented into syllables or phonemes, and some feature components extracted from the words in equal gap were applied to the neural network. That led independent result on the speech duration, and the PARCOR coefficients calculated from the frames using linear predictive analysis were employed as feature components. This paper tried to find out the optimum conditions through 4 differerent experiment which are comparison between total and pre-classified training, dependency of recognition rate on the number of frames and PARCOR order, recognition change due to the number of neurons in the hidden layer, and the comparison of the output pattern composition method of output neurons. Improving this research, real-time speaker-independent small-vocabulary automatic Korean speech recognition will be possible.