함정에서 발생하는 자계신호의 성분분리에 대한 검토

김영학,도재원,Kim, Young-Hak,Doh, JaeWon 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.8

함정의 탈자결과 평가를 위한 자계신호의 분리방법에 대한 이론적 근거와 해저 면에 설치되는 사각코일로부터 발생하는 불균일한 자계가 분리결과에 미치는 영향을 측정 신호와 FEM해석을 통해 검토하였다. 측정신호는 제작된 모델함에서 발생하는 자계를 자계센서로 측정한 것이며 FEM 계산은 제작된 모델함과 동일한 형상으로 수행되었다. ILM(induced longitudinal magnetization) 신호와 IVM(induced vertical magnetization) 신호는 함정이 가지는 투자율과 지자계의 수평과 수직방향 성분에 의해 각각 발생하는 자화에 의한 것이며, PLM(permanent longitudinal magnetization) 신호와 PVM(permanent vertical magnetization) 신호는 함정의 영구자화의 수평성분과 수직성분에 의한 것임이 확인되었다. 또한 사각 코일의 수직방향의 자계는 균일한 지자계를 완전히 상쇄할 수 없어 사각코일의 면적에 가까운 크기를 가지는 함정 일수록 사각코일의 자계 불균일성의 영향을 크게 받게 됨을 알았다. This paper investigated the separation of magnetic signal from a ferro-magnetic object. The magnetic signals were ILM(induced longitudinal magnetization) and IVM(induced vertical magnetization), which were induced by earth magnetic field and PLM(permanent longitudinal magnetization) and PVM(permanent vertical magnetization), which were due to a permanent magnetization of the object, respectively. Magnetic signal separation was based on the fact that magnetization vector could be analyzed according to longitudinal and vertical directions. Also the influence of non-uniform magnetic field from a rectangular coil on the separation was examined. A military vessel with a size close to rectangular coil has more errors on the magnetic signal separation.

함정의 형상 반자계 효과가 탈자에 미치는 영향

김영학,Kim, Young-Hak 한국정보통신학회 2016 한국정보통신학회논문지 Vol.20 No.2

본 논문은 함정의 형상이 탈자 이후에 함정에 형성되는 수직자화에 미치는 영향에 대해 조사하였다. 선박의 전면 전개도로부터 함정의 형상을 삼각형, 사각형, 원형으로 선택하여 지자계에 의한 수직방향의 유도자화를 FEM 정자장 해석으로 조사하였다. 탈자과정 중에 자화에 의한 자계를 측정하였으며, 탈자 이후 성분분리를 통해 영구자화에 의한 자계의 수평 및 수직성분의 크기를 바이어스 자계의 변화에 따라 조사하였다. 이 실험으로부터 함정의 형상을 고려하는 탈자처리 방법이 필요하며 방법으로 선수와 선미 쪽에 권선 간격을 좁게 하여 함정의 중앙부분보다 비교적 더 큰 자계가 인가되도록 하는 것이 바람직하다는 것을 알았다. This paper studied on the influence of naval vessel shape on vertical magnetic field after the vessel was demagnetized. The triangular shape, the rectangular shape and circular shape were adaped from vessel's structual drawings. Magneto-static FEM analysis was performed to obtain the iduced magnetic field due to earth magnetic field for those shapes. During demagnetization process, magnetic field of residual magnetization was observed. The holizontal and vertical magnetic field were calculated depending on vertical bias magnetic field through magnetc component seperation. To demagnetize naval vessel ship, demagnetizing coils shoud be wound more finely in the vow and stern of the ship than it should be in the mid-part of the ship.

Flash D 탈자방법에서 수직자화예측을 위한 초기자화율에 관한 검토

김영학,도재원,Kim, Young-Hak,Doh, Jaewon 한국군사과학기술학회 2014 한국군사과학기술학회지 Vol.17 No.5

A permanent vertical magnetization should be obtained to counteract induced vertical magnetization due to the earth's background field during the Flash D demagnetization process. A vertical susceptibility is needed to calculate a extra-permanent magnetization, which is needed to control the permanent vertical magnetization in stage 2 of Flash D demagnetization and added to the final vertical permanent magnetization. Two susceptibilities were found in this paper. One is obtained from the extra-magnetization. The other is obtained by magnetic field measurement from the scaled physical vessel when the vessel is excited by vertical magnetic field. The initial susceptibility by the extra-magnetization was 0.101~0.109 and the one from the measured magnetic field was 0.122. Two susceptibilities have a good agreement each other. From this paper, it is found that the susceptibility is able to appllied to calculate the extr-magnetization.

비히스테리자화에 의한 강관의 탈자 기법 연구

김영학,양창섭,신광호,Kim, Young-Hak,Yang, Chang-Seob,Shin, Kwang-Ho 한국군사과학기술학회 2009 한국군사과학기술학회지 Vol.12 No.1

In this study, we investigated whether the anhysteretic demagnetization process would be applicable to remove a complicated magnetization of a steel tube as a part of the experimental earlier study for a deperming of naval vessel. The magnetic tube used in this study was a 10cm-long and 1cm-diameter steel tube, and magnetized with a E-shape ferrite core to form a nonuniform magnetization in it. In the anhysteretic demagnetization process, a dc magnetic field applied along the longitudinal direction of the tube decreased from ${\pm}$3kA/m to zero-field with the step of ${\pm}$300A/m. At the same time, an ac bias magnetic field with the frequency of 60Hz and the field intensity of 300A/m was excited along the circumstantial direction of the tube. It was found that the anhysteretic process was useful to demagnetize a small-object like a steel tube from the experimental results showing the residual magnetization reduced over 90%.

김우진 희곡 <이영녀>에 나타난 몸성 연구 -3막을 중심으로

김영학 ( Kim Young-hak ) 한민족어문학회 2018 韓民族語文學 Vol.0 No.79

본고에서는 김우진 작 <이영녀>의 3막을 대상으로 희곡은 공연을 전제로 쓰인다는 사실을 상기하며 희곡텍스트에 구현된 연극성을 밝히고자 했다. 그러면서 <이영녀>의 3막이 1, 2막과 달리 인물의 몸성과 소리의 몸성이 텍스트의 근간을 이룬 점과 텍스트의 연극성을 효과적으로 고찰할 수 있는 점을 고려해 메를로 퐁티의 ‘몸의 현상학’을 연구방법론으로 삼았다. 먼저 인물의 몸성을 살폈다. 연구결과 김우진은 <이영녀> 3막을 인물의 미세한 심리의 변화가 몸으로 전달되도록 극작했음을 알 수 있었다. 그리고 그 결과로 얻은 인물의 몸성은 관객의 몸을 감각적으로 일깨워 연극에 개입하게 이끌 수 있음을 알았다. 즉 무대 공간에서 관객의 몸은 지각이 이루어지는 현상적인 몸으로 거듭날 수 있는 것이다. 이렇듯 말을 배제함으로써 얻은 배우 몸의 현존은 무대에서 공동 현존하는 관객의 몸성 또한 부각시킨다는 것이다. 그럼으로써 관객의 지각은 이성적으로 수용하는 차원을 넘어 감각적으로 느끼는 차원으로 확장될 수 있을 것이다. 다음으로 소리의 몸성을 살폈다. 김우진은 작품 결말에 무대를 비워놓고 효과음과 두 여성의 대화만 흐르게 한다. 관객의 예상을 깨는 이런 무대 운용으로 소리의 몸성을 강조하고 이와 동시에 로고스적인 역할을 해야 하는 언어의 의미 기능은 살리고 있다. 이런 소리의 몸성은 감각적 층위의 보이지 않는 것들을 지속적으로 감각하도록 이끄는 효과를 내기에 연극의 수행성을 제고함을 알 수 있었다. 이상에서 살핀 것처럼 김우진은 <이영녀>를 창작하면서 몸을 그 자체 하나의 주체로 인식했고, 세계와 소통하는 실존태로 받아들였다. 김우진이 작품에 구현한 몸의 물질성은 포스트드라마 연극의 지향성과 궤를 같이 하기에 놀라웠다. 이는 서구 사실주의극과 자연주의극이 소개되던 근대극 정립기에 활동한 작가이면서도 시대를 초월한 현대성을 구가한 작가라는 사실을 입증하는 것이었다. 김우진은 우리 사회에 현상학이론이 알려지기 전에 활동했던 극작가였지만 결과적으로 희곡 <이영녀>는 현상학적 몸을 구현해 보인다. 김우진이 희곡창작을 하면서 연극성에 대한 탐구를 치열하게 한 결과라 할 수 있겠다. 이런 연극성 덕분에 오늘날에도 <이영녀>는 연극 현장에서 자주 만날 수 있을 것으로 기대한다. Remembering that a drama is written with an assumption that it is for performance, this study aimed to identify the theatricality realized in the Act III of Kim Woo-Jin's drama < Leeyoungnyo >. As in the Act III of < Leeyoungnyo >, the text was based on the momirity of the characters and sound, unlike seen in Acts I and II, and theatricality of the text can be effectively examined. This study gave a focus on the Merleau Ponty's phenomenology of the body as a study method. First, this study examined the momirity of characters and as a result, it was discovered that Kim Woo-Jin intended the Act III of < Leeyoungnyo > to deliver the delicate psychological change of characters through their bodies. The momirity obtained awoke bodies of the audience sensually to join in the drama. That is, the audience’s bodies in a stage could be born again as the phenomenological bodies for perception. Thus, the existence of the character’s bodies, which were obtained through exclusion of words, also highlighted the momirity of the audience who existed. The audience's perception could be extended to the level of the sensual feeling beyond reasonable accommodation. Second, this study examined the momirity of sound. Kim Woo-Jin had sound effects and talks between the two women, which could be heard in an empty stage. Such exceptional stage direction emphasized the momirity of sound, and the semantic function of language that would work as logos. As such the momirity of sound induced us to feel what was invisible over the sensuous horizon, whereby the performance could be better. As examined above, Kim Woo-Jin recognized the bodies as a subject in writing < Leeyoungnyo >, and accepted them as existence that communicates with the world. It was surprising that the materiality of the bodies realized in his drama has the same directionality as the post-drama. It was proved that he was a playwright of the formation period of modern drama, when the realism drama and naturalism drama were introduced and enjoyed during the modernism transcending the ages. Kim Woo-Jin realized phenomenological body in < Leeyoungnyo >, although he did not know that the theories of phenomenology at the time when he was active in creating. It means that he fiercely explored the concepts of theatricality while writing dramas. It is expected that < Leeyoungnyo > will be often performed in a stage thanks to such theatricality.

<봉산탈춤>과 양주별산대놀이, 노장과장 연구 -인물의 몸짓을 중심으로-

김영학 ( Young Hak Kim ) 한민족어문학회 2014 韓民族語文學 Vol.0 No.68

This study speculated on the bodies represented in <Bongsan Talchum> and <Yangjoo Byeolsandae Nori> which take typical positions in the Korean mask drama. This study focused on the bodies realized in the texts, especially the characters(Chibari and Miyal) whose bodies played an important role while they produced important meaning through their bodies even though they did not speak any lines in the dramas. The four characters examined in this study had a common element in that they did not hide their instinct. They practiced their desires with their bodies. If there were obstacles when they took the subjects they desired, they behaved bravely in taking them. Following their senses, they reached for their goal and depended on the movement of their bodies. In other words, the players in mask dramas who led community culture were faithful to the needs of their bodies to show that any member can have freedom to enjoy their bodies. The dramas had a human perspective on the bodies presented, not a Confucian perspective. It is a modern perspective of leaders of mask dramas who wanted to be reborn as subjects of bodies beyond the taboos of Confucian feudal society. Probably the public who were oppressed under moral taboos would cheer and yell in delight. This is why our mask dramas have been popular and passed down for such a long time.

재구성 가능한 메쉬에서 결정적 유한 자동장치 문제에 대한 상수시간 알고리즘

김영학(Young Hak Kim) 한국정보처리학회 1999 정보처리학회논문지 Vol.6 No.11

In this paper, we propose the mod%uB514 %uC0C8 measure and compare the performances of the Linux, PC_Solaris and FreeBSD which are the heterogeneous PC based UNIX kernels connected by network. Using the stop-watch timer with the %u33B2 unit, we measure the important performance indices of UNIX kernels which are the primitive and command execution time and disk I/O time. Also we measure the message transfer time using the TCP, UDP and RPC methods to compare the network performance of UNIX kernels. And we compare the performance of NFS for each UNIX kernels. And we display the measured data on internet.

대학 < 사고와 표현 > 교과에 대한 플립 러닝 적용 사례 연구

김영학 ( Young Hak Kim ) 한민족어문학회 2016 韓民族語文學 Vol.0 No.72

본 연구의 목적은 플립 러닝 수업이 < 사고와 표현 > 교과에 어떻게 기여하는지를 밝히는 것이다. 더불어 < 사고와 표현 > 교과를 지도할 수 있는 플립 러닝 교육 방법을 마련하는 작은 계기로 삼고자 했다. 이를 위하여 플립 러닝 수업을 설계해 2015년 1학기 S대학 수업에서 수행한 후 교육효과를 검증하기 위한 설문 조사를 했다. 수업 참여도, 창의적 사고력, 자기주도적 학습능력에 대한 설문 결과를 분석했고, 같은 학과의 플립 러닝 비참여 분반의 설문 결과와 비교하여 교육 효과를 검증하였다. 검증 결과 플립 러닝 참여 분반이 비참여 분반보다 교육 효과를 낸 것으로 나타났다. 그중에서도 < 사고와 표현 > 교과에서 지향하는 창의적사고력을 신장한 점과 자기주도적 학습 능력에서 압도적으로 효과를 낸 점은 플립 러닝수업이 왜 미래 교육으로 각광받고 있는지를 실감케 했다. 플립 러닝을 적용한 수업은 학습자들이 미리 강의를 듣고 수업에 임하므로 교실에서의 수업 운용은 종래 수업보다 훨씬 탄력적으로 할 수 있다. 교수자는 고급 사고력을 촉진할수 있는 질문으로 본 학습을 촉진하며 활동을 이끌 수 있고, 학습자는 여유롭게 토의하면서 주어진 문제를 더욱 심층적으로 해결하는 방안을 터득할 수 있다. 이런 플립 러닝의 해체적 수업 전략 때문에 < 사고와 표현 > 교과에서 지향하는 창의적 사고력과 의사소통능력의 신장을 꾀할 수 있었다는 결론을 얻었다. The aims of this study are to identify how a flipped learning program contributes to the program of < Thinking and Expression >, and to prepare for the development of flipped learning methods to teach the program of < Thinking and Expression >. For these purposes, this study planned a flipped learning program and provided it for S university students during the first semester of 2015, after which the subjects were interviewed through the use of a questionnaire. The responses on class participation, creative thinking ability and self-leading learning ability were analysed and the results were compared with the results from non-participants in the same department to demonstrate the program``s educational effect. As a result, it was discovered that a greater education effect was shown in the participants taking the flipped learning program than in non-participants. In particular, as the program contributed to an increase in creative thinking ability that the < Thinking and Expression > program pursued, and had an outstanding effect on self-leading learning ability, it has been welcomed as a future education program. In the class for which the flipped learning is applied, as students study online programs before class, classroom teaching and learning can be more flexible. Teachers can facilitate learning through questions which can encourage quality thinking ability and students can acquire the ability to solve problems more intensively through discussion. This study suggests that flipped learning can facilitate in increasing the creative thinking and communication ability that the < Thinking and Expression > program pursued because of the dismantling class strategy of the flipped learning.

[SAFETY 부문] Monte Carlo 방법을 이용한 충돌 판별 알고리즘의 신뢰성 검증

김영학(Young-Hak Kim),정현용(Hyun-Yong Jeong) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

The Monte Carlo method was used to evaluate the reliability of crash discrimination algorithms. Through the Fast Fourier Transformation, crash pulses obtained during frontal crash tests of a mini van and a sports utility vehicle were transformed to the frequency domain, and basic signals and changeable signals were determined. By modifying the changeable signals through random generation and combining the modified signals and the basic signals, numerous crash pulses Could be generated For the generated pulses, crash discrimination algorithms were evaluated by examining whether they resulted in time-to-fires faster than required time-to-fires for the pulses requiring air bag deployment and whether they did not result in air bag deployment for the pulses requiring no air bag deployment The crash discrimination algorithm in which the summation of the absolute value of the deceleration change or the absolute value of the deceleration change multiplied by velocity was used as a metric was proven to be highly reliable.

劍道審判判定 結果에 따른 選手들의 心理的 考察

金榮學(Kim, Young-hak) 용인대학교 무도연구소 1992 武道硏究所誌 Vol.4 No.1