점탄성 물질로 만들어진 보의 대변형 해석

이경우,Lee, Kyung-Woo 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.5

The governing equation for a large deflection of linear viscoelastic beam is derived. Because of the complexity involved in the governing equation that is a nonlinear integro-differential equation, solutions were obtained by numerical approximations for the case of the cantilever beam under a concentrated load and a combined load.

부직포의 열적 성질과 보온성에 관한 책구 (III) -풍속과 두께 변화에 대하여-

이경우,박명수,신현세,주강,Lee, Kyung-Woo,Park, Myung-Soo,Shin, Hyun-Sae,Joo, Kang 한국섬유공학회 1990 한국섬유공학회지 Vol.27 No.12

The change of warmth retaining properties of non-woven fabric with thickness and air velocity has been studied. The transmission of air velocity was approached to inverse proportion at above thickness 30 mm in air velocity 1.5 m/sec but in the above air velocity that was disregarded. The effect of air velocity could be indicated to time of reach thermal equilibrium and transmission of air velocity. In the thermal equilibrium state, transition area which has less influence on the air velocity was detected in sample thickness 30 mm to 50 mm.

삼차신경 운동핵에서 교근 근방추 구심성 신경섬유 종말지의 미세구조

이경우,배용철,김진수,Lee, Kyung-Woo,Bae, Yong-Chul,Kim, Chin-Soo 대한악안면성형재건외과학회 1994 Maxillofacial Plastic Reconstructive Surgery Vol.16 No.3

교근의 근방추에서 유래하여 단일 연접성 고유수용성 악반사에 관여하는 구심성 신경섬유를 단일 축삭내 HRP 주입기법으로 염색해서 삼차신경 운동핵에서의 type I a 및 type II 신경 섬유 종말부의 미세 구조 및 연접양상을 분석한 결과는 다음과 같았다. ${\cdot}$ 대부분의 표식 종말지는 dome, 길쭉한 형태 혹은 둥근 모양을 나타내었으며, scalloped 형태 혹은 glomerulus 형태는 관찰되지 않았다. ${\cdot}$ 표식 종말지는 다수의 균일한 형태 및 크기(49-52nm) 의 투명한 구형의 소포와 때때로 소수의 치밀소포(직경:87-114nm)를 함유하고 있었다. ${\cdot}$ 표식 종말지의 크기는 type I a가 장경($1.91{\pm}0.63{\mu}m$), 단경($0.94{\pm}0.28{\mu}m$) 및 평균 직경($1.42{\pm}0.40{\mu}m$)에서 type II보다 작았다(p<0.05). ${\cdot}$ 표식 종말지는 신경원체 혹은 가지돌기와 비대칭 연접을 이루었으며, 다형소포와 같은 연접소포들을 함유하는 종말부와의 연접은 관찰되지 않았다. ${\cdot}$ 대부분의 type I a (94.9%) 및 type II(85.9%) 종말지는 단지 1개의 neuronal propile과 연접을 이루었으며, 4개 이상의 neuronal propile들과 연접을 이루는 경우는 관찰되지 않았다. ${\cdot}$ type I a 종말지에 있어서 대부분(87.2%)은 신경원체 및 근심부 가지돌기와 연접을 이루는데 반해 type II 종말지는 다수가(64.8%) 원심부 가지돌기와 연접을 이루었으며 신경원체 및 근심부 가지돌기와 연접을 이루는 경우는 35.2%에 그쳤다. 이상을 종합해 보면 단일 연접성 악반사를 일으키는 구심성 신경섬유 종말부는 삼차운동신경핵에서, 동통 및 촉각 또는 감각분별등 복잡한 감각을 처리하는 감각핵에서 보다 연접후신경원에 강력한 흥분성 신호를 전달하며 또한 대단히 단순한 연접양상을 이루는 것으로 나타났다. Muscle spindle afferents from masseter muscle were labelled by the intra-axonal HRP injection and were processed for light microscopic reconstruction. Regions containing terminal arbors scattered in the central portion of the masseteric motor neuron pool (type I a) and those restricted to 2-3 small portion of it (type II) were selected and processed for electronmicroscopic analysis with serial sections. The shape of the labelled boutons was dome or elongated shape. Scalloped or glomerulus shape with peripherial indentation containing pre or postsynaptic neuronal propiles, which is occasionally found in the trigeminal main sensory nucleus and spinal dorsal horn, was not observed. Both type Ia and type II boutons had pale axoplasm and contained clear, spherical vesicles of uniform size(dia : 49-52nm) and occasionally large dense cored vesicles(dia : 87-118nm). The synaptic vesicles were evenly distributed throughout the boutons although there was a slight tendency of vesicles to accumulate at the presynaptic site. The average of short and long diameter(short D. + long D./2) of type I a bouton was smaller than that of type II bouton. All the labelled boutons, which showed prominent postsynaptic density, large synaptic area and multiple synaptic contact, made asymmetrical synaptic contact with postsynaptic neuronal propiles. Most of the type Ia and type II boutons made synaptic contact with only one neuronal propile and boutons which shows synaptic contact or more neuronal propiles was not observed. Most of the type Ia boutons(87.2%) were presynaptic to the soma or proximal dendrite and a few remainder(12.8%) made synaptic contact with dendritic shaft or distal dendrite. In contrast, majority of type II boutons showed synaptic contact with dendritic shaft and remainder with soma or proximal dendrite. In conclusion, terminal boutons which participate in the excitatory monosynaptic jaw jerk reflex made synaptic contact with more proximal region of the neuron, and showed very simple synaptic connection, compared with those from the primary afferenst in the other region of the central nervous system such as spinal dorsal horn and trigeminal main sensory nucleus which assumed to be responsible for the mediating pain, tactile sensation, sensory processing or sensory discrimination.

U.C.C를 기반으로 하는 한시학습 방법 연구 -7차 고등학교 교육과정 한시를 중심으로-

이경우 ( Kyung Woo Lee ) 한국한문교육학회 2009 한문교육논집 Vol.32 No.-

In December 2006, <Time> magazine of the United States selected `you` for the person of the year, 2006` and announced `ordinary you` who boosting influence in the area of media blog or media `as a man of the year`. It shows the UCC rising a influence media. The advanced Internet environment make users unilaterally using the content stand in the position of active producers. This manuscript includes a concept of UCC and its characteristics. In general, the video UCC, as it is called, reminds us what is using the images and the video sources which are created by users themselves using those media such as digital camcorders or digital cameras, photo images or video. The video UCC which is designed in this paper is considered as what is User`s recreated-contents. Releasing contents using other`s production is against a copyright law. Therefore, key information about a copyright law and legal way to make the video UCC are explained in this manuscript. To make the video UCC, skill to deal with related software and support of hardware for photographing and editing are needed. There are two ways to overcome these difficulties. Firstly, I made a teacher`s own video UCC for education. Second, I, as a teacher, let students make story -boards of the scenario and edited them. The class using video UCC enabled students to be interested in the Sino- Korean poetry learning, and within a short time, people, history, ideology, in other words, the learners could get the background knowledge covering literature, history, philosophy. Trying making `Sino-Korean poetry video UCC scenarios` was not the superficial, simple knowledge acquisition of Sino-Korean poetry, but could recreate by being video, and internalize the author`s poetic emotions by a learner himself. Therefore, this learning could help develop the creativity, the emotion cultivation of the students. Through this research, I would like to propose a few things. First, most teachers should not be afraid to change their own media, have the active attitude. Second, a legal and institutional provision which enables learner to create freely their projects without the conflict of the copyright problem should be made. Third, it is necessary that the government have positive interesting and support to make the open sources which are free from the conflict of the copyright problem database, such as sound, photographic images or video clips. Fourth, a moduled-video editing tool by which people can edit easily video clips-open source that is required for the classes should be developed. Fifth, also for the development of e-textbooks in the future, we should keep in mind the changes in these media, and then the research should be conducted. Sixth, to be used effectively in the field of the professor-learning, the research and development of the professor-learning strategies should be continued.

타고나는 것인가 교육되는 것인가? 과외와 교육 불평등

이경우 ( Kyung Woo Lee ),한순구 ( Sun Ku Hahn ),성태윤 ( Tae Yoon Sung ) 연세대학교 경제연구소 2015 延世經濟硏究 Vol.22 No.1

우리나라는 1980년대에 과외에 관한 정책을 급격히 바꾸었다. 즉 1980년에 과외를 거의 완전히 금지했지만 1989년에 다시 자유화했다. 이 논문에서는 이러한 정책 변화를 활용하여 사교육이 서울대와 연세대와 같은 명문대학입학생 수에 미치는 영향을 분석한다. 실증분석의 결과, 1989년에 과외가 합법화된 이후 서울대와 연세대 합격자 수가 상대적으로 부유한 지역(강남, 수도권)에서 크게 늘었음을 알 수 있다. 이러한 결과는 부유한 가구가 과외와같은 사교육을 경제적으로 감당할 수 있기 때문에 덜 부유한 가구에 비해 과외 자유화로부터 더 큰 이익을 얻었음을 시사한다. In 1980s, Korea changed the policy on private tutoring quite dramatically: it was almost completely prohibited in 1980 but liberalized later in 1989. We use such a dramatic policy change to examine the impact of private education on the number of students who entered prominent universities such as Seoul National University and Yonsei University. We find from the empirical analysis that since the legalization of private tutoring in 1989, the number of such students has increased significantly in wealthier regions like Gangnam or the Capital area, compared with less wealthy regions. This finding indicates that wealthy households have benefitted from the liberalization of private tutoring disproportionately more, as only those households could afford costly private investment in education like private tutoring.

접속어미 " - 아서 " 와 " - 니까 " 의 연구

이경우 ( Kyung Woo Lee ) 한국어교육학회(구-한국국어교육연구학회) 1987 韓國國語敎育硏究會 論文集 Vol.30 No.-

1. 도시 저소득층을 위한 탁아프로그램 실시사례 : H 유아원을 중심으로

이경우(Kyung Woo Lee) 이화여자대학교 한국여성연구원 1988 여성학논집 Vol.5 No.-

The purpose of this study is (a) to design a conceptual day care program for children and their working mothers ; (b) to perform the program to H Kindergarten in Y Dong ; and (c) to modify conceptual day care program based on group games. The subject of the study is 30 H Kindergarten children of 5, 6, 7 years old and their working mothers. The method used for this study was to design instructional day care program based on "Model for Planning an Instructional System" by A.J. Fiorino. Also records by the study team (the researcher of this project, project assistant, the kindergarten teacher, and assistant teacher) and case studies were summarized for the study purpose. Finally group games for the day care program were modified after iteration. On the basis of perform ("trade offs") 45 group games were drawn for one academic year activities. In this study, only 12 group games are discussed in detail. The list of parents' education for 1988, and two parents' manuals are shown in the appendix.

1-3형 압전복합체를 이용한 광대역 수중 음향 트랜스듀서 개발

이경우(Lee, Kyung-Woo),소형종(So, Hyoung-Jong),임실묵(Lim, Sil-Mook),김원호(Kim, Won-Ho),김대연(Kim, Dae-Yun) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.4

Recently, it is required that acoustic transducers for underwater detection and communication sensor have wide bandwidth and low operating frequency. In this research, the new acoustic transducer is proposed. This transducer is tonpilz type, and made of 1-3 piezoelectric composites as a driving parts. The developed transducer is evaluated the TVR(transmission voltage response) and RVS(receiving voltage sensitivity) characteristics around $4{\sim}14\;kHz$ frequency range and is compared to conventional tonpilz transducer made of solid piezoelectric ceramics as a driving parts. The resonance frequency of the developed transducer is decreased by 30% and the -3 dB bandwidth is increased by 90%, compared to conventional transducer with same dimensions. The value of TVR is decreased by 9 dB and The value of RVS is the same at resonance frequency.

실행가능한 장애보험 개혁 연구

이경우(Kyung-woo Lee) 한국재정학회(구 한국재정·공공경제학회) 2018 재정학연구 Vol.11 No.2

이 연구에서는 한국의 장애보험에 관한 단순하면서도 효과적인 개혁 방안을 제시하고 그 후생효과를 측정한다. 즉 경증장애인과 중증장애인을 위한 공공부조 제도인 장애 수당과 장애인연금 대신, 급여를 장애 정도와 상관없이 소득인정액의 선형함수에 따라 지급 하는 “통합장애수당”을 도입하는 “단순개혁”의 효과를 분석한다. 이를 위해 경증장애와 중증장 애가 발생 가능하고 현행 장애보험 관련 제도들이 모두 존재하는 생애주기 모형을 고려한다. 분석 결과 단순개혁에 의한 후생효과를 극대화하려면 정부가 (i) 소득인정액이 월 231만원 미만이면 “120.1만원-0.53×소득인정액”에 따라 급여를 지급하지만, (ii) 소득인정액이 월 231 만원 이상이면 2.3만원의 정액세를 부과해야 한다. 장애가 심할수록 소득이 낮기 때문에 이러한 단순개혁을 통해 더 많은 정부 지원을 받을 수 있어서 자원배분의 형평성(equity)이 크게 개선된다. 이로 인한 후생효과는 0.72%의 소비증가와 동일하고 이는 장애보험 개혁의 최대 후생효과의 55.1%, 최대 형평성 개선효과의 84.6%에 달한다. 이 결과는 제시된 단순개혁이 사회후생을 증대시키는데 매우이 연구에서는 한국의 장애보험에 관한 단순하면서도 효과적인 개혁 방안을 제시하고 그 후생효과를 측정한다. 즉 경증장애인과 중증장애인을 위한 공공부조 제도인 장애 수당과 장애인연금 대신, 급여를 장애 정도와 상관없이 소득인정액의 선형함수에 따라 지급 하는 “통합장애수당”을 도입하는 “단순개혁”의 효과를 분석한다. 이를 위해 경증장애와 중증장 애가 발생 가능하고 현행 장애보험 관련 제도들이 모두 존재하는 생애주기 모형을 고려한다. 분석 결과 단순개혁에 의한 후생효과를 극대화하려면 정부가 (i) 소득인정액이 월 231만원 미만이면 “120.1만원-0.53×소득인정액”에 따라 급여를 지급하지만, (ii) 소득인정액이 월 231 만원 이상이면 2.3만원의 정액세를 부과해야 한다. 장애가 심할수록 소득이 낮기 때문에 이러한 단순개혁을 통해 더 많은 정부 지원을 받을 수 있어서 자원배분의 형평성(equity)이 크게 개선된다. 이로 인한 후생효과는 0.72%의 소비증가와 동일하고 이는 장애보험 개혁의 최대 후생효과의 55.1%, 최대 형평성 개선효과의 84.6%에 달한다. 이 결과는 제시된 단순개혁이 사회후생을 증대시키는데 매우 효과적임을 보여준다. 효과적임을 보여준다. This paper proposes a simple but effective reform of Korea’s disability insurance (DI) system and quantifies its welfare effects. Specifically, I consider the “simple reform” that replaces the current social assistance programs for the disabled with the “unified disability allowances,” which pay benefits by a linear function of the asset-adjusted income (AAI) regardless of the disability status. To assess its effects, I adopt a life-cycle model in which both mild and severe disabilities can occur, and all of Korea’s DI programs exist. I find that to maximize welfare gains from the simple reform, the government should (i) pay monthly benefits following the formula “1.201 million won–0.53×AAI” if AAI is below 2.31 million won; but (ii) impose a lump-sum tax of 23,000 won otherwise. As income tends to decline with the severity of disability, this reform yields a substantial equity gain because benefits rise more for more severely disabled agents. The simple reform is equivalent to a 0.72% consumption increase in terms of welfare effects and achieves 55.1% of the total welfare gains and 84.6% of the equity gain from the optimal reform. This finding suggests that the proposed simple reform be very effective in improving social welfare.

나노필터를 이용한 교내 미세먼지 저감 및 실내공기질 개선 - 라즈베리파이를 이용한 나노필터 실효성 검증-

이경우(Kyung-woo, Lee),김영진(Yung-Jin, Kim),이재준(Jae-jun, Lee),윤종호(Jong-Ho, Yoon) 한국생태환경건축학회 2019 한국생태환경건축학회 학술발표대회 논문집 Vol.19 No.2