고속의 암호칩 구현을 위한 파이프라인드 설계 방법

이완복,류대현,최태완 진주산업대학교 2004 論文集 Vol.43 No.-

Symmetric key cryptography algorithms are continuous repeating process of transpose and transposition, and have four modes of CBC, ECB, CFB, and OFB according to the operation methodology. Also, the algorithms have a number of computation because final cryptography sentences in the algorithm are internally accomplished by the various round of repeating computation. In this paper, we propose the pipelined design methodology to accelerate the cryptography operation in the ECB mode of block cryptography algorithm. In the proposed method, we implemented cryptography operation block of many rounds and can extremely improve overall operational speed because the method is continuously executed. As the results of estimation after designing the cryptography chip by pipelened structure, several tens of improved performance in the case of 3DES is possible, but we have known the generating of disadvantage that the chip size is increased.

비정질 금속 리본 Co66Fe4NiB14Si15 거대자기임피턴스 효과

이희복,조완식 公州大學校 基礎科學硏究所 1996 自然科學硏究 Vol.5 No.-

비정질 금속 ?? 거대자기임피턴스 효과를 측정하였다. 자기 임피턴스 효과는 강자성체 시료의 임피턴스가 시료에 걸어준 자기장에 따라서 달라지는 현상이다. MlR (Magnetoimpedance Ratios)는 ?? 정의되며 ? 시료방향으로 자기장을 가하여 임피턴스가 포화될 때의 자기장의 세기이다. 본 시료의 MIR 값은 적절한 자장중 열처리 후에 250 %이상 증가하였다. The giant magnetoimpedance (GMI) effect in amorphous ribbon ?? has been obtained. Magnetoimpedance (MI) effect is a high-frequency phenomenon, which describes the changes of impedance in any ferromagnetic sample, when a magnetic field is applied on it. MlR(Magnetoimpedance Ratios) is defined as ?? where ?? is the saturating field along the long side of the sample. The MIR of the sample has been reached as much as 250% after proper thermal treatments in a magnetic field.

大腸洗滌이 血液의 有形成分에 미치는 影響 : 육상선수를 중심으로

우재학,이복식,하현보,윤양진,이종환 釜山大學校 附設 體育科學硏究所 1987 體育科學硏究所 論文集 Vol.3 No.-

TERUDERMIS를 이용한 골 혹은 건이 노출된 창상의 치료

최민호,이상복,황정욱,양완석,이강길 大韓成形外科學會 1999 Archives of Plastic Surgery Vol.26 No.3

Deep skin and soft tissue defects with exposed bone and tendon is difficult to treat, because skin graft rarely survives and flap surgery is sacrifice of donor site. Since "Stage I" membrane was developed by Yannas and Bruke in 1980, numerous kinds of artificial skin have been developed. The adaptability of "Terudermis", developed by the Terumo Co., as an artificial skin composed of sponge made of a fibrillar atelocollagen and a heat-denatured atelocollagen, was clinically evaluated on application to 13 cases presenting deep skin and soft tissue defect with exposed bones and tendons from October 1997 to march 1998. Terudermis has the advantage of allowing early incorporation of fibroblasts and capillaries into its collagen sponge due to very weak dehydrothermal cross-linking. Before Terudermis graft, several days of wet dressing and debridement were required to prepare healthy well- vascularized bed because Terudermis was weak on unsanitary wounds. After bed preparation, Terudermis was grafted like usual skin graft. Tie-over bolster dressing or compressive dressing was used case by case. The dressing was opened 2~3 days after Terudermis grafting. Wet dressing was done daily until the skin graft was done. Autologous skin graft was done 2∼3 weeks after Terudermis graft. Our clinical results indicated that Terudermis was beneficial in treating 77% of our patients. Through the use of this new method, treatment of severe skin and soft tissue defects that are usually treated by musculocutaneous or other conventional skin flaps can be replaced by Terudermis as an new artificial dermis.

Views of Principals and General Education Teachers towards Inclusion for Kindergarteners with Disabilities

Lee, Sang Bok,Kwon, Myung Ok,Lee, Wan Wo 한국정서행동장애학회 2005 정서ㆍ행동장애연구 Vol.21 No.4

본 연구는 B시에 소재하고 있는 사립유아교육기관의 운영자와 일반교사가 지니고 있는 장애(위험) 유아들의 통합교육에 대한 인식을 알아보고자 하였다. 현재 우리나라 유치원과정의 유아들에 대한 통합교육 필요사항들을 근거로 하여, 이전 연구에서 제시된 질문들을 재구성하여 그 타당도와 신뢰도를 점검한 설문지를 통하여 자료수집 되었다. 222명의 응답자들을 대상으로 수집된 자료분석의 결과, 유아교육기관의 운영자와 일반교사 대부분이 통합교육에 대해 긍정적인 인식을 나타내고 있음을 나타냈다. Inclusion is one of the more attention-getting issues on the current education. The current study was to examine the views of kindergarten principals and general education teachers towards inclusion for young children with disabilities. A sample of 222 participants(99 principals and 113 teachers) in B city of Korea were studied, using a survey questionnaire, their perception was analysed. The results showed positiveness towards inclusion in the respondents' views suggests practical readiness requires to be launched.

Evaluation of internal fit of interim crown fabricated with CAD/CAM milling and 3D printing system

Lee, Wan-Sun,Lee, Du-Hyeong,Lee, Kyu-Bok The Korean Academy of Prosthodonitics 2017 The Journal of Advanced Prosthodontics Vol.9 No.4

PURPOSE. This study is to evaluate the internal fit of the crown manufactured by CAD/CAM milling method and 3D printing method. MATERIALS AND METHODS. The master model was fabricated with stainless steel by using CNC machine and the work model was created from the vinyl-polysiloxane impression. After scanning the working model, the design software is used to design the crown. The saved STL file is used on the CAD/CAM milling method and two types of 3D printing method to produce 10 interim crowns per group. Internal discrepancy measurement uses the silicon replica method and the measured data are analyzed with One-way ANOVA to verify the statistic significance. RESULTS. The discrepancy means (standard deviation) of the 3 groups are $171.6\;(97.4){\mu}m$ for the crown manufactured by the milling system and 149.1 (65.9) and $91.1\;(36.4){\mu}m$, respectively, for the crowns manufactured with the two types of 3D printing system. There was a statistically significant difference and the 3D printing system group showed more outstanding value than the milling system group. CONCLUSION. The marginal and internal fit of the interim restoration has more outstanding 3D printing method than the CAD/CAM milling method. Therefore, the 3D printing method is considered as applicable for not only the interim restoration production, but also in the dental prosthesis production with a higher level of completion.

DEVSIF Composer: A Synthesis Tool for Fast Interpretation of Simulation Models

Lee, Wan-Bok The Korea Institute of Information and Commucation 2008 Journal of information and communication convergen Vol.6 No.1

The methods or algorithms which can accelerate simulation speed became of great importance, as the modeling and simulation methodology for discrete event systems is used in many areas such as model validation/verification and performance evaluation. This paper proposes a tool named, DEVSIF composer. The tool is made of an automated compiled simulation technology and it builds a new composed model which can be executed much fast by composing the component models together. Models are described by our new specification language DEVSIF, which is compatible with object-oriented language and supports representation of a hierarchical model structure. Experimental results demonstrates that DEVSIF composer enhances the simulation speed of a transformed DEVS model 5 times faster than that of the original ones in average.

Selective Detection of a Reducing Gas Using WO₃ -Decorated ZnO Nanorod-Based Sensor in the Presence of Oxidizing Gases

Lee, Jae Kyung,Lee, Woo Seok,Lee, Wan In,Choi, Seung Bok,Hyun, Soong Keun,Lee, Chongmu Wiley (John WileySons) 2018 Physica status solidi. PSS. A, Applications and ma Vol.215 No.20

Electroluminescent Properties of Organic Light-emitting Diodes with Hole-injection Layer of CuPc

Lee, Jung-Bok,Lee, Won-Jae,Kim, Tae-Wan The Korean Institute of Electrical and Electronic 2014 Transactions on Electrical and Electronic Material Vol.15 No.1

Emission properties of the organic light-emitting diodes were investigated with the use of a hole-injection layer of copper(II)-phthalocyanine (CuPc). The manufactured device structure is indium-tin-oxide (ITO) (180 nm)/CuPc (0~50 nm)/N,N'-Bis(3-methylphenyl)-N,N'-diphenylbenzidine (TPD) (40 nm)/tris-(8-hydroxyquinoline) aluminum (III) ($Alq_3$) (60 nm)/Al(100 nm). We investigated the luminescence properties of $Alq_3$ which is affected by the CuPc hole-injection layer. Also, we studied the influence of light-emission properties in the structure of an ITO/CuPc/TPD/$Alq_3$/Al device depending on the several thicknesses of CuPc (0~50 nm) layer. As a result, it was found that the hole injection occurs smoothly in the device with 20 nm thick CuPc layer, and the properties become significantly worse in the device with a CuPc layer thickness higher than 40 nm. We studied the topography and external quantum efficiency depending on the layer thickness of CuPc. Also, we analyzed the electroluminescent characteristics in the low and high-voltage range.

Evaluation of internal fit of interim crown fabricated with CAD/CAM milling and 3D printing system

Wan-Sun Lee,Du-Hyeong Lee,Kyu-Bok Lee 대한치과보철학회 2017 The Journal of Advanced Prosthodontics Vol.9 No.4

PURPOSE. This study is to evaluate the internal fit of the crown manufactured by CAD/CAM milling method and 3D printing method. MATERIALS AND METHODS. The master model was fabricated with stainless steel by using CNC machine and the work model was created from the vinyl-polysiloxane impression. After scanning the working model, the design software is used to design the crown. The saved STL file is used on the CAD/CAM milling method and two types of 3D printing method to produce 10 interim crowns per group. Internal discrepancy measurement uses the silicon replica method and the measured data are analyzed with One-way ANOVA to verify the statistic significance. RESULTS. The discrepancy means (standard deviation) of the 3 groups are 171.6 (97.4) μm for the crown manufactured by the milling system and 149.1 (65.9) and 91.1 (36.4) μm, respectively, for the crowns manufactured with the two types of 3D printing system. There was a statistically significant difference and the 3D printing system group showed more outstanding value than the milling system group. CONCLUSION. The marginal and internal fit of the interim restoration has more outstanding 3D printing method than the CAD/CAM milling method. Therefore, the 3D printing method is considered as applicable for not only the interim restoration production, but also in the dental prosthesis production with a higher level of completion.