병렬 공간 데이터베이스의 질의 처리를 위한 비용 모델의 설계 (pp.90-92)

안성우(Sung-Woo Ahn),서영덕(Young-Dok Seo),홍봉희(Bong-Hee Hong) 한국정보과학회 2000 한국정보과학회 학술발표논문집 Vol.27 No.1B

비용모델과 측정(Cost Model and Estimation)은 모든 DBMS에서 성능 측정을 하기 위한 기본적인 도구이다. 지금까지의 질의 수행에 대한 비용모델을 제시하는 연구가 많이 있었지만 대부분의 연구가 특정 부분에 대한 비용-CPU비용, 색인 방법에 대한 I/O횟수, I/O비용 등-만을 고려함으로써 질의를 수행하는데 필요한 전체적인 비용을 산출하는데 부족한 점이 있었다. 그리고 병렬 공간 DBMS에 대한 비용모델을 산출하는 연구가 아직까지 이루어지지 않았다. 이 논문에서는 병렬 공간 DBMS에서 질의를 처리하는데 드는 전체적인 비용을 산출하고 있다. 기존의 연구에서 제시하고 있는 비용모델을 적용하고, 병렬 컴퓨터와 공간 데이터가 결합되었을 때의 고려사항을 추가하여 병렬 공간 DBMS에 적합한 전체적인 비용모델을 산출함으로써 병렬 공간 DBMS에서의 효율적인 질의수행에 대한 다른 연구를 수행할 때 비용모델에 대한 초석을 제공한다.

기업 정보시스템 형성과정에서의 유동성과 ‘기술의 논리’

안성우(Sung-Woo Ahn) 한국정보사회학회 2003 정보사회와 미디어 Vol.- No.5

청각장애 학생들의 인지과정 특성 연구

안성우(Seong Woo Ahn),이광렬(Kwang Ryeal Lee) 한국언어치료학회 2008 言語治療硏究 Vol.17 No.1

The purpose of this study is to investigate cognitive process ability in students with hearing impairment using Cognitive Assessment System developed on the basis of PASS model of intelligence by Das and Naglieri. Forty one students with hearing impairment who are aged from 12 to 17 years took part in this study. These students were divided into two groups according to their ages and performance level of sign language and vocabulary level and level of hearing loss. In this study, the picture vocabulary test was used to investigate students vocabulary ability, Korean Sign Language proficience checklist was used to examine students ability of sign language performance.   Results are following.   First, Students grade and degree of hearing loss do not have any effect on students cognitive process ability.   Second, Students vocabulary knowledge and performance level of Korean Sign Language have effect on students cognitive process performance. Student with high score on vocabulary test performed better than students with low score on vocabulary test on cognitive process test. On the top of that, student with high score on Korean sign language checklist performed better on cognitive process test than students with low score on Korean sign language checklist.

육자배기의 선율구조에 관한 연구

안성우(Ahn Sung-woo) 한국전통음악학회 2000 한국전통음악학 Vol.- No.1

YukJaBaeGi is well known as a representative of NamDoMinYo(a folk song sung in southern area of Korea) and has unique MiBunEum and SiGimSae. This research compares and analyzes the various music with its emphasis on JaJinYukJaBaeGi rather than GinYukJaBaeGi, two streams of YukJaBaeGi, We found several characteristics based on the analysis on eight kinds of YukJaBaeGi materials. First, YukJaBaeGi progresses with certain melody forms. Out of 57 JangDan, [melody form 1] has 12 JangDan, [melody form 2] has 17 JangDan, [melody form 3] has 17 JangDan, and the rest 11 JangDan show various other forms. Therefore, the melody of YukJaBaeGi can be roughly divided into 3 forms, and each material has different number of JangDan. Considering 6 Bak as 1 Gak, 4 Gak as 1 JangDan, and 3 JangDan as 1 Jeol, we found that the 5 materials have the same JangDanTeul, of which 1 Jeol consists of 3 JangDan. However, the rest 3 materials show Jeol, which consists of 2 or 4 JangDan. In addition, YukJaBaeGi in 『Tree with deep root』 and 『Korean music volume 4』, and 『YukJaBaeGi of IHwaJungSeon』 have JangDan which has 2 or 3 Gak rather than 4 Gak. We think the difference of singers and words resulted in such different structures of JangDan in each material. It is similar to SanJo where the performers play slightly differently, make and set up their own "Ryu" in the end. This characteristic also appears in Pansori, and it is one of the factors of Korea music which promotes autonomy and creativity. Accordingly, we could find that YuJaBaeGi could be different based on the person who sings and the words it has and is not always the same. Secondly, YukJaBaeGi follows the scale of GaeMyeonJo, g, b, c, d, e b, f. Most of the JongJiEum of each JangDan is g scale, and the JongJiEum of each Jeol with burden is c scale. We noticed an unusual fact that the end scale of Gak which is right before the c scale, the JongJiEum of each Jeol, is almost always g scale. We found that in most of the melody 1 Jeol consists of 3 JangDan from the fact that 1 Jeol with 3 JangDan are 16 cases, 1 Jeol with 2 JangDan are 5 cases, and 1 Jeol with 4 JangDan are 2 cases, out of the total melodies we analyzed. Further studies on Korean folk songs including YukJaBaeGi should be made from new research aspects. Folk Songs reflect characteristic emotion of their original provinces and those can be found both in melodies and in words. However, researches to date seem to place too much emphasis only on melody or scale. Scholars of Korean language also actively do researches on folk songs and the genre of music literature has been formed showing the breadth and depth of the ongoing folk song research. Words of folk songs may be what attract the scholars. 『Study on Korean GaAk(music)』 written by a Korean language scholar, approaches the words through the musical analytic methods as good as those of music scholars. It means that the music with words such as folk songs have substantial value. In this respect, the researches on the correlation between melodies and words of folk songs should be thoroughly made.

플립러닝을 적용한 수업방법이특수교육과 대학생의 전공 교과목 학업 성취에 미치는 영향

안성우(Ahn, Seoung-Woo),유은정(Yoo, Eun-Jung) 한국청각·언어장애교육학회 2021 한국청각·언어장애교육연구 Vol.12 No.2

본 연구의 목적은 플립러닝을 적용한 수업 방법이 특수교육과 대학생의 전공 교과목 학업 성취에 미치는 영향을 알아보는 것이다. 연구에 참여한 대상자는 P대학교 특수교육과 2학년 학생들이었고, 교과목 수업은 총 3년에 걸쳐 진행되었다. 수업이 진행된 연도에 따라 실험집단1, 실험집단2 그리고 통제집단으로 임의 배정하여, 실험을 진행하였다. 연구 방법은 양적 및 질적 연구의 혼합적 방법이며, 독립변인은 전통적 강의수업방식, 전체토론중심 플립러닝 수업방법과 짝토론 중심 플립러닝 수업 방법이고, 종속 변인은 중간고사 결과, 학교의 온라인 객관적 강의평가, 주관적 강의평가 그리고 학생들의 수강 소감문이었다. 연구결과는 다음과 같다. 세 집단 간에 중간고사 학업 성취도에는 유의미한 차이가 없으며, 온라인 객관적 강의 평가에서도 세 집단 간 유의미한 차이가 없었다. 그러나 주관적 강의 평가와 수강 소감문에서 플립러닝 수업방법에 대한 긍정적인 기술이 많았다. 결론적으로 거꾸로 수업이 전통적 강의식 수업보다 학업 성취 측면에서 더 효과적이지는 않았지만 다른 여러 측면에서는 효과가 있다는 것을 본 연구는 보여준다. This study investigated the effect of flipped learning on college students’academic achievement , their rating on lecture evaluation and their feedback on flipped learning method. Subjects were 2nd year students in 2016, 2017, 2018 in the department of special education who had took two academic subjects which were subject of diagnosis and evaluation for students with special needs and subject of education for students with hearing disabilities. Each group of students from a year of 2016, 2017, 2018 was exposed nonrandomly to 3 different types of teaching methods to the researcher’s advantage. 3 teaching methods included traditional teaching method, flipped learning method 1 and flipped learning method 2. The results are followed. There is no difference in effectiveness of each teaching method. Students who were exposed to flipped learning method performed as good as students who were exposed to traditional teaching method on academic achievement tests in diagnosis and evaluation for students with special needs and education for students with hearing disabilities. Qualitative analysis showed that degree of students’satisfaction toward flipped learning was higher.

저소득층 일반 아동과 다문화 가정 아동의 음운인식능력 비교 연구

안성우(Seoung-Woo Ahn),신영주(Young-Ju Shin) 한국언어치료학회 2008 言語治療硏究 Vol.17 No.4

The purpose of this study was to investigate difference in phonological awareness between multi-cultural background children and low-income children in order to find out the effect of language experience on development of phonological awareness ability when parental socioeconemic status was controlled. The sample was composed of 44 low-income children from Cheonlla province area and 48 multi-cultural background children from Busan area.The result obtained in this study were as follows:The total score of phonological awareness tasks of multi-cultural background children was similar to those of low-income class children. While phoneme awareness ability of low income children was not different from that of multi culture background children, phonological awareness ability in syllable is different between low income children and multi cultural background children.

인공와우이식 아동의 읽기 연구에 관한 선행연구 분석: 읽기 능력과 읽기 관련변인을 중심으로

안성우 ( Seong Woo Ahn ),허민정 ( Min Jung Heo ) 한국특수아동학회 2010 특수아동교육연구 Vol.12 No.3

이동체 데이터베이스를 위한 R-tree 기반 메인 메모리 색인의 설계 및 구현

안성우(Sung Woo Ahn),안경환(Kyoung Hwan An),홍봉희(Bong Hee Hong),이창우(Chang Woo Lee) 대한공간정보학회 2006 한국공간정보시스템학회 논문지 Vol.8 No.2

Recently, the need for Location-Based Services (LBS) has increased due to the development of mobile devices, such as PDAs, cellular phones and GPS. As a moving object database that stores and manages the positions of moving objects is the core technology of LBS, the scheme for maintaining the main memory DBMS to the server is necessary to store and process frequent reported positions of moving objects efficiently. However, previous works on a moving object database have studied mostly a disk based moving object index that is not guaranteed to work efficiently in the main memory DBMS because these indexes did not consider characteristics of the main memory. It is necessary to study the main memory index scheme for a moving object database. In this paper, we propose the main memory index scheme based on the R-tree for storing and processing positions of moving objects efficiently in the main memory DBMS. The proposed index scheme, which uses a growing node structure, prevents the splitting cost from increasing by delaying the node splitting when a node overflows. The proposed scheme also improves the search performance by using a MergeAndSplit policy for reducing overlaps between nodes and a LargeDomainNodeSplit policy for reducing a ratio of a domain size occupied by node`s MBRs. Our experiments show that the proposed index scheme outperforms the existing index scheme on the maximum 30% for range queries.

일반초등학교에 통합된 인공와우이식 아동의 구어능력 및 관련변인 분석

안성우 ( Seong Woo Ahn ),허민정 ( Min Jung Heo ) 한국특수아동학회 2011 특수아동교육연구 Vol.13 No.1

본 연구의 목적은 학령기 인공와우이식 아동의 구어능력을 어휘 이해 및 표현과 구문으로 나누어서 생활연령에 근거한 구어능력과 청각연령에 근거한 구어능력을 알아보고, 구어능력에 대한 수술연령, 수술전 청각수행력, 인공와우 사용기간, 생활연령, 현재의 청각수행력의 관련성을 분석하여 학령기 인공와우이식 아동의 청각-언어 재활에 대한 기초적 자료를 제공하고, 언어 중재에 대한 시사점을 제시하고자 하는 것이다. 이를 위해 만 5세 이전에 인공와우이식을 받고 초등학교에 재학 중인 인공와우이식 아동 79명을 대상으로 어휘력 검사와 구문의미 이해력검사를 시행하여 생활연령에 근거한 표준점수와 청각연령에 근거한 표준점수를 산출하였고, 언어 영역간 점수 차이를 비교하였다. 인공와우이식 아동의 구어능력에 대한 수술연령, 수술전 청각수행력, 인공와우 사용기간, 생활연령, 말소리 지각력의 관련성을 알아보기 위해서 상관분석과 중다회귀분석을 시행하였다. 분석 결과, 인공와우이식 아동의 생활연령에 근거한 구어능력은 또래 건청 아동에 비해서 매우 낮은 것으로 나타났으며, 특히 형태구문능력에서 큰 결함이 있었다. 청각연령에 근거한 구어능력을 분석한 결과 어휘발달 속도에서 청각연령이 같은 건청 아동보다 빠른 발달을 보였고, 표준점수는 건청 아동의 정상범주에 해당하였다. 관련변인을 분석한 결과, 수술연령과 말소리 지각력이 유의한 영향을 미치는 것으로 나타났다. The purpose of this study were to investigate the oral language abilities of school-aged children with cochlear implants in terms of vocabulary and morpho-syntactic aspects, and to analyze the effects of child-related factors and speech perception on language abilities in these children. The subjects of this study were 79 children with cochlear implants who received the cochlear implantation under age of five and used oral communication, and 114 CA matched normal hearing children. Language abilities were evaluated using the REVT and KOSECT, and were calculated standard scores with reference to both chronological age and hearing age. The effects of child-related factors and speech perception on language abilities were analyzed using correlational analysis and multiple regression. Participants showed oral language delay in standard scores derived from CA, but not in standard scores derived from HA. Among three aspects of language, children with CIs had more difficulties in morpho-syntactics than in receptive and expressive vocabulary. The results of multiple regression revealed speech perception and age at implantation affected oral language abilities of school aged children with CIs. These results showed that continuous and intensive auditory-language education, especially focusing on grammar, is required for school years, and early implantation is helpful for reducing the language delay before implantation.

아동의 연령과 부모의 사회 경제적 지위에 따른 아동의 음운 처리 능력과 글자지식 특성 연구

안성우 ( Seong Woo Ahn ) 한국특수아동학회 2008 특수아동교육연구 Vol.10 No.4