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이형렬 김천과학대학 1997 김천과학대학 논문집 Vol.23 No.-
The problems of SK combinator graph reduction machine are large graph traversal space to search nodes of combinator and many execution of garbage collector result from allocation of additional space. In order to reduce graph traversal space, this paper proposed new reduction machine that transform reduction rule and node cdnstruction. In addition, to reduce execution time of garbage collector, this paper proposed varient node size depending on combinator. And then show experimental result for proposed reduction machine.
이형렬 김천과학대학 2001 김천과학대학 논문집 Vol.27 No.-
This paper proposes character recognition system for complex color documents. The proposed system consists of two components : text extraction and text recognition. It extracts text regions using a neural network that trains a set of texture discrimination masks for the given texture clases : text region and non-text region. And it extracts character-segments from the text regions using location and color information. Character recognition is performed by the comparison of the extracted character-segment and the templates that represent shapes of characters. To assess the validity, the experiments are performed with a variety of documents.
이형렬 김천과학대학 2003 김천과학대학 논문집 Vol.29 No.-
A thinning algorithm is a vary important factor in order to increase recognition rate in the character recognition. This paper is the study of a parpllel thinning algorithm available for the recognition of various characters, and it proposes the thinning algorithm which can extract the skeleton of the recognized character almost similar to the original pattern by using the depth value of each pixel constructing the lines. Characteristics of the proposed algorithm are easiness of implementation of parallelism, the result of thinning is one pixel width. The proposed algorithm requires small number of iteration and only a single pass per iteration; hence, it is substantially faster than other algorithms.
이형렬,김홍읍 김천과학대학 2002 김천과학대학 논문집 Vol.28 No.-
Information representing the thickness of the original lines from the thinning results can be applied efficiently in order to implement the automated vectorizing system. This paper propose a preprocessing scheme of thinning which can show the information of the original lines' thickness of the thinning result. In the proposed scheme, the depth of each pixel constructing the lines of map was calculated, which was represented by the number of layers composed of neighboring pixels surrounding the original pixel. And then the original lines' thickness could be recognized through the depth information of the skeleton from the thinning results. We implemented the proposed scheme and experimented on a contour map. Using the depth information of the skeleton, we could easily distinguish each line of the contour either an intermediate or an index contour.
비평가인자 함수언어의 다중스레드 코드 생성을 위한 생성기의 설계
김홍읍,이형렬 김천과학대학 1998 김천과학대학 논문집 Vol.24 No.-
Non-strict functional language with implicit parallelism needs dynamic scheduling and synchronization, because of non-strict's mechanism. Multithreaded model is efficient parallel processing model to solve latency time, dynamic scheduling, synchronization problemby combination of dataflow mode and von Neumann model. This model's efficiency is determined by construcion of thread and source language. This paper's generator translates kernel language, intermediate code, from non-strict functional language with implicit parallelism. Now and then generator translates multithreaded code from kernel language through dataflow graph.
신석재,강현춘,안형환,강안수,김용렬,한성만,이한섭 明知大學校 産業技術硏究所 1995 産業技術硏究所論文集 Vol.14 No.-
In the electrodeposition of copper foil for preparing printed circuit boards, a little amount of gelatin as a addition agent has been used for the better characteristics of a coat of electroplating. Gelatin modifies the physical properties such as mechanical strength, matte-side roughness, ultimate tensile strength(U.T.S), and elongation of copper foil, furthermore gelatin have influence on the structure of electrodeposits and the cathode polarization. The electrolyte used was of a composition; CuSO₄·5H₂O 300g/ℓ, H₂SO₄ 100g/ℓ, NaCl 10 ppm as a brightner, and was gelatin 0-7 ppm as a addition agent. Current density was 50 A/dm², and the temperature of electrolytic bath was 50 to 52 ℃. Experiments showed that the optimum gelatin concentration was 5 ppm with the consideration of the numbers of electrodeposited nuclei. And the nuclei numbers was sharply increased under 5 ppm, but was almostly constant above 5ppm. Average matte-side roughness by Surfcorder was gradually increased with the increasing gelatine concentration up to 2 ppm, and maximum roughness was observed at 2ppm. The roughness showed gradual decrease within the concentration range of 2 to 4 ppm, and was almost constant above 4ppm . Within the gelatine concentration range of 0 to 7 ppm, as the concentration increased, UTS was increased and elongation was decreased logarithmically. Also, in comparison between UTS and elongation, gelatin was identified as an addition agent acting inversely.
Effect of Indium Mole Fraction on the Diode Characteristics of ZnO:In/p-Si(111) Heterojunctions
Lee, Jong Hoon,Jang, Bo Ra,Lee, Ju Young,Kim, Hong Seung,Jang, Nak Won,Kong, Bo Hyun,Cho, Hyung Koun,Bae, Ki Ryeol,Lee, Won Jae,Yun, Young IOP Publishing 2011 Japanese journal of applied physics Vol.50 No.r3
Neurite Guidance on Laser-Scribed Reduced Graphene Oxide
Lee, Sang Hwa,Lee, Han Byeol,Kim, Yoonyoung,Jeong, Jae Ryeol,Lee, Min Hyung,Kang, Kyungtae American Chemical Society 2018 NANO LETTERS Vol.18 No.12
<P>This paper describes a one-step, chemical-free method to generate micropatterned in vitro neuronal networks on chemically unmodified reduced graphene oxide. The suggested method relies on infrared-based photothermal reduction of graphene oxide, which concurrently leads to the formation of submicrometer-scale surface roughness that promotes neuronal adhesion and guides neurite outgrowth. A commercially available laser source (LightScribe DVD drive) controlled by a computer software can be used to reduce graphene oxide (GO), and its repetitive scribing to a GO film brings about gradual increase and decrease in electrical conductivity and neurite guiding ability of the scribed regions, respectively. Our results also indicate that the observed adhesion-promoting and neurite guiding effect originate from the contrast in surface nanotopography, but not that in conductivity. This method is readily applicable to diverse graphene-based biomedical devices.</P> [FIG OMISSION]</BR>
EPO 사용이 없었던 말기신부전으로 혈액투석 중인 환자에서 발생한 적혈구증가증
김형종 ( Hyung Jong Kim ),이동형 ( Dong Hyung Lee ),류동열 ( Dong Ryeol Ryu ),유태현 ( Tae Hyun Yoo ),최훈영 ( Hoon Young Choi ),정준원 ( Jun Won Jeong ),강신욱 ( Shin Wook Kang ),최규헌 ( Kyu Hun Choi ),이호영 ( Ho Yung Lee ) 대한신장학회 2005 Kidney Research and Clinical Practice Vol.24 No.4