Shape Invariant Korean Character Recogmition Using Optical Associative Memory

도양회,김정우,김수중 濟州大學校 工科大學 産業技術硏究所 1994 産業技術硏究報告 Vol.5 No.-

A holographic implementation of an optical associative memory system for shape invariant recognition of the printed Korean character is proposed. The structure of the recognition system is a single-layer neural network employing feedback. To form an optical memory loop, we use cascaded Vander Lugt correlators. The first holographic correlator is made of MACE filter having a high discrimination capability. And to reduce the size of the recognition system, we multiplex four MACE filters into one. Thus, 14 consonant MACE filters and 10 vowel MACE filters can be synthesized into four consonant MMACE filters and three vowel MMACE filters, respectively. The second holographic correlator. on the other hand, is made of a CMF having broadband characteristics so that the reconstructed image has high fidelity. Computer simulation results show that the proposed system has shape invariance and high discrimition capability.

멀티미디어를 활용한 교육방법 변화의 경향과 과제 : 광주광역시 교육청 사례를 중심으로 A Case of Kwangju School District

김회수 한국교육정보방송학회 1996 교육정보미디어연구 Vol.1 No.2

본 연구의 목적은 학교 교육 현장에 어느 정도 컴퓨터 활용기반이 구축되어 있는가, 그리고 학교교육 정보화률 추진하기 위해서 어떠한 요인이 충족되어야 할 것인가를 광주광역시 교육청의 사례를 기초로 검토하는 것이다. 학교교육의 문제점으로 지적되는 삶과 유리된 교육 지식전달 위주의 교육, 창의력을 기르지 못하는 교육 둥이 지적되었고 이를 위해 컴퓨터를 활용할 수 있다고 보았다. 현재 학교교육 헌장에 보급되는 하드웨어 및 소프트웨어의 실태는 열악한 상황이기 때문에 광주광역시 교육청과 전남교육청의 사례에 비추어볼 때 하드웨어 투자를 위한 장기적인 계획 수립과 시행, 소프트웨어 개발체제의 구축, 행·재정적 지원, 사회적 지원 분위기 확산, 각종 자문을 위한 컨소시엄 구축, 교사연수, 적극적 소프트웨어 개발과 활용을 위한 유인체제의 확립과 시행 등이 효과적인 교육정보화를 위한 관건임을 지적되었다. The first task of this paper was to examine the value of multimedia for solving problems of schooling such as decontextualized instruction, implementation of knowledge-centered curriculum, and fail to ehance creative thinking skills. This paper also analyized the status of information infrastructure in schools. After discussing these aspects, a short history of recent educational innovations in Kwangju is given. Attention is then turned towards more practical issues surrounding incorporation of information technology in the Kwangju school system. Results from this case study showed that several factors needed to be considered. These include: (1) building social consensus about educational technology innovations, (2) attaining administrative and financial support, (3) in-service teacher training, (4) distribution of advanced hardware and software, (5) cooperation with colleges and companies, (6) reward and incentive system.

비정질/다결정 실리콘 Gate를 이용한 Gate 산화막 특성 개선

정회환,정관수 慶熙大學校 材料科學技術硏究所 1992 材料科學技術硏究論集 Vol.5 No.-

The polysilicon films were deposited in a LPCVD furnace on oxidized substrates at temperatures above 620℃. The polysilicon gates were doped by a LPCVD furnace with POCl_(3) as the dopant gas. Dopant diffusion through the gate can lead to a degradation of the electrical properties. The interface properties have been characterized SIMS, ASR analysis. We have studied the breakdown properties of MOS fabricatied by depositing polysilicon on very thin(200Å) gate oxides grown by wet oxidation in a conventional furnace. The amorphous/poly silicon gates have higher breakdown field than the polysilicon gates.

작문매체와 학습자의 메타인지가 작문의 질과 길이 및 작문태도에 미치는 영향

조경은,김회수,염시창 한국교육정보미디어학회 1999 교육정보미디어연구 Vol.5 No.2

본 연구의 목적은 작문에서의 컴퓨터(워드프로세서) 사용이 최근 작문에서 중요하게 논의되고 있는 학습자의 메타인지와 함께 작문의 결과에 미치는 영향을 알아보는 것이었다. 이를 위해 광주에 있는 U중학교 3학년 남학생 80명을 대상으로 메타인지 수준별(상·하)과 워드집단과 지필집단으로 무선 배정한 후 수업시간에 작문을 하도록 하고 작문 결과와 작문 태도 검사를 통해 작문의 길이와 질, 그리고 작문에 대한 태도 및 그 상호작용 효과를 실험하였다. 실험 결과 워드를 사용한 집단과 메타인지 상위 집단의 작문의 길이와 질은 더 좋았으나, 작문의 태도나 작문 매체와 메타인지 수준에 따른 작문의 길이와 질, 태도의 상호작용 효과는 의의 있는 차이가 없었다. 이에 작문 매체와 메타인지 수준은 작문의 길이와 질에 영향을 준다는 것과, 작문의 태도 및 매체와 메타인지 수준의 상호작용 효과는 다양한 실험 설계와 충분한 시간, 워드프로세서를 이용한 작문 기회의 확대 등과 더불어 다시 논의되어져야 할 것임을 알 수 있었다. The purpose of this study was to examine the effects of media and metacognition and their interactive effects on writing quantity, quality, and students' attitudes toward writing. The subjects of this experiment were selected 80 male students from third grades at U middle school in Kwangju city. The research design was 2x2 factorial design with four groups by levels of metacognition and writing medm. On the basis of metacognition test scores, the subjects were divided into two groupshgh vs. low), and these groups were randomly assigned to ane of word-processor writing group and hand-writing group, forming four groups in total. After pretest of writing attitudes, each group were given 45 minutes writing time and took the posttest of writing attitudes after a week. ANOVA and ANCOVA were employed to analyze the data and the significance level, alpha was set at a .05 level. The results were as follows: First, the word-processing group was superior to the hand writing group in writing quantity and quality. second, the high-metacognition group was superior to the low metacognition group in writing quantity and quality. But, writing media and metacognition didn't have a significant effects on student' s attitudes. third, there was no interaction effects between the writing media and the levels of prior metacognition on writing quantity, quality and students' attitudes. Last, in the word-processing group, high metacognition subjects received higher scores than low metacognition subjects. The findmgs from this study indicated that writing media and metacognition had significant effects on writing quantity and quality, and that we must rethink

Scanning Tunneling Microscope(STM)의 제작

김동식,정회환,정관수 慶熙大學校 材料科學技術硏究所 1993 材料科學技術硏究論集 Vol.6 No.-

In this paper, we have designed and constructed a scanning tunneling microscope(STM) for studying on the atomic scale strucure of semiconductor surfaces We considered next four points. Firstly, we used triple spring damping system for stable measurement. Secondly, we soldered electronic part on PCB board to minimize electronic noise. Thirdly, we made stable power supply part to reduce drift power noise. Fourthly, stainless steel 302 was used for future UHV experiment. In operating the STM, we could eliminate the effect of external vibration by adopting the triple spring damping system. Noise of 60 Hz which was generated by wire connection between electronic and mechanical part, was eliminated by drying the silver paste thoroughly. Tip voltage was biased by 10mV We have obtained clear images of HOPG(high oriented pyrolitic graphite) when tunneling current was 2nA. In conclusion, we have confirmed that our STM have a resolution of atomic scale by investigation of the image of HOPG surface.

열 변화에 의한 구리전선의 미세조직 및 상 변화에 관한 연구(Ⅲ)

박성우,김윤회,김상현,박남규,김수철,김영만 內務部 國立科學搜査硏究所 2002 國立 科學 搜査 硏究所 年報 Vol.34 No.-

Image encryption and Identification for security verification

김종윤,도양회,김수중 濟州大學校 産業技術硏究所 1999 산업기술연구소논문집 Vol.10 No.1

A new image encoding and identification scheme is proposed for security verification by using a CGH (computer generated hologram), random phase mask, and correlation technique. The encrypted image. which is attached to the security product, is made by multiplying QP-CGH(quadratic phase CGH) with a random phase function. The random phase function plays a key role when the encrypted image is decrypted. The encrypted image can be optically recovered by a 2-f imaging system and automatically verified for personal identification by a 4-f correlation system. Simulation results show the proposed method can be used for both the reconstruction of an original image and the recognition of an encrypted image.

건식경량벽체의 내충격성능 평가방법에 관한 연구 (Ⅰ) : 인간이 벽체에 가하는 충격하중의 분석을 위한 실험 및 고찰 An Experiment to Analyze the Human Impact Load Applied to Framed Walls

신윤호,안정업,김대희,최수경 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

The purpose of this study is to establish an evaluation method of fracture of light-weight framed walls by human impact load. In this paper, part (I), we analyzed human impact load applied to framed walls. At first, we made original measuring equipment of impact load, and carried out the experiment on human impact load in various action. After the experiment, we extracted the essential characteristics. And grasped the property of human impact load systematically based on the relation between maximum load and load velocity.

메타인지적 지식과 작동기억이 메타인지적 규제 요구 과제의 성취에 미치는 영향

진화봉,이순아,김회수 한국교육정보미디어학회 2003 교육정보미디어연구 Vol.9 No.3

본 연구는 자기주도적 학습 능력의 핵심요소로 강조되는 메타인지가 작동기억의 중앙집행장치와 어떤 관계에 있는지 경험적 연구를 통해 밝히고자 하였다. 이를 위해 초등학생을 대상으로 세 개의 실험집단과 한 개의 비교집단을 구성하여, 메타인지적 지식과 작동기억이 메타인지적 규제 요구 과제의 성취도에 어떤 영향을 주는지 검토하였다. 실험 결과, 메타인지적 지식 수준이 높은 피험자는 낮은 피험자보다 메타인지적 규제를 요구하는 과제에서 더 높은 성취도를 나타냈다. 작동기억 용량에 따른 메타인지적 규제 요구 과제 성취도에 미치는 효과분석에서는 중앙집행장치와 언어적 작동기억을 제외한 시· 공간적 작동기억이 성취도에 영향을 미치는 것으로 나타났다. 그러나 시 · 공간적 작동기억 검사도구의 신뢰도가 높지 않았기 때문에 이 문제에 대한 결론을 확정하기 위해서는 추가적인 반복실험이 필요하다. 작동기억을 억제했을 때의 메타인지적 규제 요구 과제 성취도는 예측했던 대로 중앙집행장치 억제집단이 비교집단에 비해 유의미하게 낮고, 네 집단 중에서도 가장 낮은 것으로 나타났다. 이 결과는 메타인지적 규제 요구 과제가 중앙집행장치의 많은 인지적 자원을 필요로 하기 때문에 중앙집행장치 용량의 상하에 따른 성취도는 차이가 나타나지 않지만, 중앙집행장치를 억제하면 성취도는 크게 떨어지는 것으로 해석된다. 본 연구결과는 메타인지적 규제의 기능을 작동기억의 중앙집행장치가 담당하며, 메타인지적 규제능력이 높은 학습자는 자기주도적 학습에서 성공할 가능성이 높다는 것을 시사한다. 따라서 자기주도적 학습을 메타인지적 규제의 관점에서 접근하는 연구는 작동기억의 중앙집행장치를 고려해야 보다 설명력 있는 결과를 얻을 수 있을 것이다. This study was to examine the relationship between two components of metacognition and working memory that were considered as critical constructs to have influence on self-directed learning. The subjects were 140 sixth graders. They were randomly assigned to the three experimental groups and the control. Three experimental groups were given tasks requiring metacognitive regulation and concurrent working memory suppression tasks. The control group performed only the task requiring metacognitive regulation. The results of this study were as follows: The subjects with high metacognitive knowledge got higher achievement in the task requiring metacognitive regulation than the low metacognitive knowledge group. Visuo-spatial working memory span affected task performance requiring metacognitive regulation. However, because of low reliability of visuo-spatial span test additional experiments are necessary to confirm the results. As expected, the central executive suppression group showed significantly lower performance of metacognitive regulation tasks than the control group. Also the other groups got the lowest achievement. The findings suggested that the central executive would play the role of metacognitive regulation and the students with high metacognitive regulation skills would be successful in self-directed learning. It is desired that the study regarding the relationship between self-directed learning and metacognitive regulation skills consider the students' central executive capacity.

Construction Process & Technologies Applied to Parc.1 Project

Hoi-soo, Seo,Jae-min, Baek Council on Tall Building and Urban Habitat Korea 2022 International journal of high-rise buildings Vol.11 No.3

POSCO E&C has completed Parc.1 project successfully. The construction period was 42months, and 1.5 million workers were participated till completion. To meet schedule management and quality control, POSCO E&C has adopted a lot of technologies such as GPS measurement, 3D scanning, vibration control, stack effect control, column shortening control, etc