Improvement on Bailey-Paar's Optimal Extension Field Arithmetic

이문규,Lee, Mun-Kyu Korean Institute of Information Scientists and Eng 2008 정보과학회논문지 : 시스템 및 이론 Vol.35 No.7

최적확장체(Optimal Extension Field: OEF)는 유한체의 일종으로서, 타원곡선 암호시스템의 소프트웨어 구현에 있어 매우 유용하다. Bailey 및 Paar는 $P^i$ 거듭제곱 연산을 비롯하여 다수의 효율적인 OEF 연산 알고리즘을 제안하였으며, 또한 암호 응용에 적합한 OEF를 생성하기 위한 효과적인 알고리즘을 제안하였다. 본 논문에서는 Bailey-Paar의 $P^i$ 거듭제곱 알고리즘이 적용되지 않는 반례를 제시하며, 또한 그들의 OEF 생성 알고리즘은 실제로 OEF가 아닌 유한체를 OEF로 출력하는 오류가 있음을 보인다. 본 논문에서는 이러한 문제들을 해결한 개선된 알고리즘들을 제시하고, OEF의 개수에 관한 수정된 통계치를 제시한다. Optimal Extension Fields (OEFs) are finite fields of a special form which are very useful for software implementation of elliptic curve cryptosystems. Bailey and Paar introduced efficient OEF arithmetic algorithms including the $p^ith$ powering operation, and an efficient algorithm to construct OEFs for cryptographic use. In this paper, we give a counterexample where their $p^ith$ powering algorithm does not work, and show that their OEF construction algorithm is faulty, i.e., it may produce some non-OEFs as output. We present improved algorithms which correct these problems, and give improved statistics for the number of OEFs.

압착단자의 3차원 검사를 위한 스테레오 비젼 알고리즘

이문규,장상원,Lee, Moon-Kyu,Jang, Sang-Won 대한산업공학회 1998 산업공학 Vol.11 No.2

This paper suggests a stereo vision-based algorithm for the 3-dimensional inspection of a crimped terminal. The crimped terminal is one of wire harness assemblies which transmit current or signals between a pair of electrical or electronic assemblies. Four types of nonconformities considered includes terminal rolling, band up/down, twist, and crimp height. To obtain stereo image correspondence, an algorithm using Hough transform is proposed. Coordinate transform is then applied to evaluate the degree of 3-dimensional nonconformities. The algorithm has been successfully tested on a number of real specimens collected from a wire harness factory. The test results show the feasibility of the proposed algorithm.

PNF를 이용한 보행 훈련이 만성 뇌졸중 환자의 균형 및 보행에 미치는 영향(단일사례설계)

이문규,윤태원,김윤환,임재헌,Lee, Moon-Kyu,Yun, Tae-Won,Kim, Yoon-Hwan,Lim, Jae-Heon 대한고유수용성신경근촉진법학회 2012 PNF and Movement Vol.10 No.1

Purpose : The purpose of this study was to observe the effect of a gait training using PNF on a gait and balance ability of a person with chronic stroke. Methods : The subject was left hemiplegia due to cerebral infarction. The subject participated in PNF gait training session as well as baseline for 30 minutes a day for 4 weeks. we used the 10-meter walking test(10MWT), figure-8-of walk test(F8WT), dynamic gait index(DGI) for measuring the gait ability and four square step test(FSST), Berg balance scale(BBS) for measuring the balance ability through the whole sessions. Results : The gait ability was enhanced compared to first baseline, as measured by 10MWT(27.3%), F8WT(36.6%), DGI(8 points increased). The balance ability was improved compared to first baseline, as measured by FSST(49.1%), BBS(10 points increased). The increase was maintained in second baseline session. Conclusion : The PNF gait training program is helpful to enhance the adaptation of the gait and balance according to the various environmental demands.

ICF 모형의 고유수용성신경근촉진법 실기 적용

이문규,김태윤,Lee, Moon-kyu,Kim, Tae-yoon 대한고유수용성신경근촉진법학회 2009 PNF and Movement Vol.7 No.1

Purpose : To provide a convenient framework for PNF practice, we reviewed the relationship between ICF framework and PNF framework. Methods : We reviewed literatures related with ICF and PNF. Results : ICF model is useful tool for physical therapist who is working in PNF to identify the interactions the components of individual's health, especially the relationship between functioning and disability. A framework for PNF is philosophy which included the concept, functional approach. It is essential to identify primary activity limitation and causal impairment in PNF field and evaluate the their relationship. The ICF model can be used to classify the examination information. Next step is to prioritize the activity limitation and then evaluate the interrelationships among each components of the ICF framework. Conclusions : ICF model guides physical therapist in PNF practice to identify patient problems and evaluate the interrelationship of components of their health. This model is logical framework to directs functional approach as PNF philosophy to be approached the goal.

컴팩트 냅색 기반의 공개키 암호시스템에 대한 저밀도 공격

이문규(Mun-kyu Lee),박근수(Kunsoo Park) 한국정보과학회 1997 한국정보과학회 학술발표논문집 Vol.24 No.2Ⅳ

냅색 문제는 NP-complete 문제로서, 이 문제에 기반한 많은 공개키 암호시스템들이 제안된 바 있다. R. C. Merkle과 M. E. Hellman은 컴팩트 Merkle-Hellman 시스템을 제안하였으며, C. H. Lin, C. C. Chang, 그리고 R. C. T. Lee는 Diophantine 방정식에 기반한 공개키 암호시스템(LCL 시스템)을 구성하였으나 이 시스템의 암호화 함수는 컴팩트 냅색 암호시스템의 그것과 같다. 본 논문에서는, 평문의 서브블럭 크기 b가 logn 보다 매우 크다는 가정하에서, 밀도가 1보다 작은 대부분의 컴팩트 냅색 시스템들은 저밀도 공격을 이용하여 깨진다는 것을 증명한다. 또한 실험을 통해 저밀도 공격 방법이 컴팩트 Merkle-Hellman 시스템과 LCL 시스템에 대한 공격에서 좋은 성능을 보임을 확인한다.

압착단자의 자동검사를 위한 시각인식 알고리즘

이문규,이정화,Lee, Moon-Kyu,Lee, Jung-Hwa 대한산업공학회 1998 산업공학 Vol.11 No.1

This paper describes a machine vision algorithm for inspecting a crimpled terminal. The crimpled terminal is one of wire harness assemblies which transmit current or signals between a pair of electrical or electronic assemblies. The major defect considered is wire exposure on wire barrels. To detect the wire exposure, we develope a multi-layer perceptron in which three features extracted from the image of the crimpled terminal are used as input data. The three features are edginess, variance, and total number of valley points(TVP). The multi-layer neural network has been successfully tested on a number of real specimens collected from a wire-harness factory.

블록 암호 알고리즘을 사용하지 않는 인증 암호화 방법

이문규,김동규,박근수,Lee, Mun-Kyu,Kim, Dong-Kyue,Park, Kunsun 한국정보과학회 2002 정보과학회논문지 : 시스템 및 이론 Vol.29 No.5

We propose a new authenticated encryption scheme that does not require any block encryption algorithm. Our scheme is based on the Horster-Michels-Petersen authenticated encryption scheme, and it uses a technique in the Bae~Deng signcryption scheme so that the sender's signature can be verified by an arbitrary third party. Since our scheme does not use any block encryption algorithm, we can reduce the code size in its implementation. The computation and communication costs of the proposed scheme are almost the same as those of the Bao-Deng scheme that uses a block encryption algorithm. Our scheme also satisfies all the security properties such as confidentiality, authenticity and nonrepudiation. 본 논문에서는 블록 암호 알고리즘을 사용하지 않는 새로운 인증 암호화 방법을 제안한다. 이 방법은 Horster-Michels-Petersen 인증 암호화 방법에 기반하고 있으며, Bao-Deng 서명암호화에 이용된 기법을 적용함으로써 전송자의 서명을 수신자 이외의 임의의 제삼자가 검증할 수 있는 특성을 지닌다. 제안된 방법은 블록 암호 알고리즘을 이용하지 않으므로 구현시 코드 크기를 줄일 수 있는 장점을 가지며, 블록 암호 알고리즘을 이용하는 Bao-Deng 방법과 거의 같은 정도의 계산량 및 통신량만을 필요로 한다. 또한 제안된 방법은 기밀성, 인증성, 부인방지 등 안전성 요건들을 만족시킨다.

신경계물리치료에서의 근거중심실기(2) -지속가능한 EBP 수행을 위한 정보검색 기술-

이문규,김태윤,임재헌,Lee, Moon-Kyu,Kim, Tae-Yoon,Lim, Jae-Heon 대한고유수용성신경근촉진법학회 2017 PNF and Movement Vol.15 No.2

Purpose: Researchers found that blocks of evidence-based practice (EBP) implementation lacked opportunities for EBP education. The study found that physical therapists had negative views of research as well as their roles in EBP, lacked confidence in EBP, and had limited access to web-based materials. The purpose of this study was to highlight the importance of information research technology for efficient EBP in a clinical environment. Methods: The web-based information research technologies that should be used for sustainable EBP include: the clinical practice guideline (CPG) and PubMed's My NCBI service. Journal mailing services and other academic information sources should also be used to gather information from RSS feeds. An EBP library or archive must be created. A site that provides EBP-specific information is also needed. Results: We should usually do EBP. Practitioners must learn and use information technologies that will help them improve their EBP skills. Conclusion: Facilitating EBP implementation and building an EBP system require related education as well as a practical work environment and equipment. However, the highest priority is individual efforts and trial. Information technology will complement the lack of time. It is important to use information research technology to overcome real obstacles. Lasting EBP must use a number of web-based information research technologies to overcome the practical challenges encountered in EBP implementation.

바렉터 다이오드를 이용하지 않은 광대역 Push-Push 전압제어 발진기

이문규,문성모,민상보,Lee Moon-Que,Moon Seong-Mo,Min Sangbo 한국전자파학회 2005 한국전자파학회논문지 Vol.16 No.4

본 논문에서는 저가형 구조에 이용 가능한 X-band 대역의 push-push형 VCO를 제안하였다. 제작된 push-push형 발진기는 부가적인 바렉터 다이오드를 사용하지 않고, 컬렉터 바이어스를 가변하여 X-band에서 넓은 주파수 가변을 얻었다. 측정 결과 컬렉터 바이어스 전압을 $4\~9V$ 가변하였을 때 $10.9\cal{GHz}\~11.8\cal{GHz}$의 $900\cal{MHz}$의 주파수 가변, $-30\;\cal{dBc}$ 이하의 우수한 $f_0$ 억압 특성, $-115\;\cal{dBc/Hz}\;@\;1\;\cal{MHz}$의 위상 잡음 특성을 가졌다. An X-band push-push VCO for low cost applications is proposed. The designed push-push oscillator achieves a wide tuning range in the X-band by the collector bias tuning instead of extra varactor diodes. The measurement shows a wide tuning bandwidth of $900\;\cal{MHz}\;from\;10.9\;\cal{GHz}\;to\;11.8\;\cal{GHz}$ with a drain bias voltage varying from 4 to 9 V, excellent fudamental suppression of $-30\;\cal{dBc}$ and good phase noise of $-115\;\cal{dBc/Hz}\;@\;1\;\cal{MHz}$ offset.

신경계물리치료에서의 근거중심실기(1) -임상의사결정과정에 EBP 적용하기-

이문규,임재헌,김태윤,Lee, Moon-Kyu,Lim, Jae-Heon,Kim, Tae-Yoon 대한고유수용성신경근촉진법학회 2016 PNF and Movement Vol.14 No.3

Purpose: The purpose of this study was to share an experience about processes and lessons learned to execute evidence-based practice (EBP) in neurological physical therapy. Methods: The most important thing in applying EBP to practice is to search, find, and appraise the existing evidence. Many evidence databases are available, such as CENTRAL, PEDro, PUBMED, and EMBASE. However, the knowledge represented in these databases is not always perfect. The practice model is a set of processes to resolve client problems. Therapists should make hypothesis-focused decisions through EBP. Integrating clinical reasoning and evidence is most important when it comes to the execution of EBP. Results: The process of EBP consisted of following: coming up with clinical questions, followed by searching for, appraising, evaluating, and integrating evidence. To integrate EBP into practice, it is necessary to consider clinical expertise, patient value and preferences, as well as research wth the best evidence. We provided an example of a clinical case with a stroke patient to show how this process and framework concerning clinical reasoning through evidences can be integrateds. During this process, we also utilized information technology to improve EBP ability. Conclusion: We should recognize what manner of information is needed to resolve eash patient's problem, and we should search for this information efficiently. Then, we should judge the value of the information obtained as it applies, to the clinical setting.