약속어음 등의 위조와 불법행위로 인한 손해배상액(1)

정현수 한국사법행정학회 1987 사법행정 Vol.28 No.5

C-MLCA와 1차원 CAT를 이용한 의료 영상 암호화

정현수,조성진,김석태 한국전자통신학회 2019 한국전자통신학회 논문지 Vol.14 No.2

In this paper, we propose a encryption method using C-MLCA and 1D CAT to secure medical image for efficiently. First, we generate a state transition matrix using a Wolfram rule and create a sequence of maximum length. By operating the complemented vector, it converts an existing sequence to a more complex sequence. Then, we multiply the two sequences by rows and columns to generate C-MLCA basis images of the original image size and go through a XOR operation. Finally, we will get the encrypted image to operate the 1D CAT basis function created by setting the gateway values and the image which is calculated by transform coefficients. By comparing the encrypted image with the original image, we evaluate to analyze the histogram and PSNR. Also, by analyzing NPCR and key space, we confirmed that the proposed encryption method has a high level of stability and security. 본 논문에서는 효율적으로 의료 영상을 보호하기 위하여 C-MLCA와 1차원 CAT를 이용한 암호화 방법을 제안한다. 먼저, Wolfram 규칙으로 상태 전이 행렬을 생성한 후 최대 길이의 수열을 만든다. 다음으로 여원 벡터를 곱하여 복잡한 수열로 변환한다. 그리고 두 수열을 행과 열로 곱하여 원 의료 영상 크기의 기저 영상을 생성한 후 XOR 연산을 한다. 마지막으로 게이트웨이 값을 설정하여 만들어진 1차원 CAT 기저함수와 CAT 변형 계수가 적용된 영상을 연산하면, 최종적으로 암호화된 영상을 얻을 수 있다. 암호화된 영상은 원 의료 영상과 비교하기 위해 히스토그램과 PSNR을 사용하여 평가한다. 또한 NPCR과 키 공간 분석을 통하여 제안한 방법의 안정성을 검증한다.

21년간의 숙원사업을 성취한 전파천문학-세계전파통신회의 WRC-2000 의제 1.16-

정현수,정희창,이황재,배석희,강상선 한국천문학회 2000 天文學會報 Vol.25 No.2

모바일 앱 위·변조 공격 및 대응방안

정현수,Jung, Hyun Soo 중소기업융합학회 2015 융합정보논문지 Vol.5 No.1

최근 스마트폰 사용자가 늘어남에 따라 사소한 개인적 용도에서부터 금전거래까지 사용범위 또한 늘어나는 추세이다. 이에 발 맞춰서 해킹기술들도 다양해지는데 그중에서도 이슈화되고 있는 것이 위 변조이다. 모바일 앱 위 변조는 본래의 앱과 비슷하게 만들어내 사람들을 속이는 용도로 사용하는 해킹기술이다. 이 기술은 보안의 3대요소인 기밀성, 무결성, 가용성중에 무결성을 침해한다. 이 경우 신뢰성이 저하되고 앱 자체의 위험성 증가와 가치가 떨어지게 된다. 이를 통해 정보에 권한이 없는데도 마음대로 개인정보를 가져갈 수 있게 되고 심하게는 자산손실에 까지 사회적 영향을 끼치게 된다. 즉, 본 내용에는 위 변조의 정의와 원리, 마지막으로 대응방안까지 정리하였다. 이를 통해 현재 상황과 어떻게 예방할 수 있는지 알게 한다. Recently range of use also being increase along with smart phone users growing. And keep pace with hacking technician is increasing inter alia tamper technician has issued. This technician infringe integrity on three element of security of data. In this case reliability has deteriorated, the app itself has increased danger, and it's value has reduced. This can affect like take information even though don't have any authority to information or hemorrhage at large in this country. In other words, I has been arranged tamper's definition to.

수수의 추출조건에 따른 기능성 비교

정현수,이정훈,권해용,조유영,김형돈,서경혜,최재훈,장귀영,김동휘,이승은 한국약용작물학회 2018 한국약용작물학술대회 발표집 Vol.2018 No.10

Background : Acetylcholine is related with various functions, including cognition and behavior, and increased activity of cholinesterase has been reported in the brains of people suffering from Alzheimer’s disease (AD). As such, the inhibition of cholinesterase activity could be a means of ameliorating neuronal degenerative diseases such as AD. Reactive oxygen species (ROS) can cause neuronal cell damage. The AchE inhibitory effects of Sorghum bicolor (SB) have been revealed by research. This study was conducted to compare the cholinesterase inhibitory effects and anti-oxidative effects of SB extracts according to their extraction conditions. Methods and results : Eight extracts were prepared from SB seed, which was extracted using three different methods including room temperature extraction, reflux extraction at 85℃, and accelerate solvent extraction (ASE) at 50℃ by using distilled water and/or ethanol as a solvent. AchE and BuchE inhibition activities of the extracts were measured in vitro, and their inhibitory activities on ROS, nitric oxide (NO) production and cell proliferation were analyzed in lipoppolysacchride–treated BV2 mouse microglia cells. According to the results of the experiments, the 50% ethanol extract obtained by room temperature extraction showed a BuchE inhibitory effect of 40% at the final concentration of 100 ㎍/㎖, while the other 50% ethanol extracts showed a BuchE inhibitory effect of around 20%. The 100% Ethanol extract obtained from reflux extraction at 50 ㎍/㎖ showed the highest inhibitory effect on NO generation as 58.3%, whereas the 50% ethanol extract obtained from ASE extraction at 50 ㎍/ ㎖ showed the highest inhibitory effect on ROS generation as 56.0%. Conclusion : The results of the experiments show that the 50% and 100% ethanol extracts prepared under different temperature, pressure and solvent conditions have more effective on strong cholinesterase inhibition, anti-oxidative and anti-inflammatory effects..

Early Experience With a Thermo-Expandable Stent (Memokath) for the Management of Recurrent Urethral Stricture

정현수,김준우,이준녕,김현태,유은상,김범수 대한비뇨의학회 2013 Investigative and Clinical Urology Vol.54 No.12

Purpose: To report our early experience with thermo-expandable urethral stents (Memokath) for the management of recurrent urethral stricture and to assess the efficacy of urethral stents. Materials and Methods: Between March 2012 and February 2013, 13 patients with recurrent urethral stricture after several attempts with direct visual internal urethrotomy (DVIU) or failed urethroplasty underwent DVIU with thermally expandable, nickel-titanium alloy urethral stent (Memokath) insertion. Follow-up study time points were at 1, 3, 6, 9, and 12 months after stent insertion. Follow-up evaluation included uroflowmetry, retrograde urethrogram, plain radiography, and urinalysis. Results: The mean patient age was 47.7 years (range, 18 to 74 years). The mean urethral stricture length was 5.54 cm (range, 1 to 12 cm). There were six patients with bulbar, four patients with proximal penile, one patient with distal penile, and two patients with whole penile urethral strictures, respectively. The overall success rate was 69% (9/13) and the mean postoperative peak flow rate was 17.7 mL/s (range, 6 to 28 mL/s). Major complications occurred in four patients including one patient (7.7%) with urethrocutaneous fistula induced by the stent and three patients with urethral hyperplasia. The mean follow-up duration was 8.4 months. Conclusions: Our initial clinical experience indicates that thermo-expandable stents can be another temporary management option for recurrent urethral stricture patients who are unfit for or refuse urethroplasty. Distal or whole penile urethral stricture can be factors predicting poor results.

김정일체제의 '비김일성화'에 대한 연구

정현수 경희대학교 한국정치연구소 2016 한국정치연구 Vol. No.

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[경남의 연극인들] 경남연극을 ‘살아있게’ 하는 사람들

정현수 공연과이론을위한모임 2020 공연과 이론 Vol.- No.80

호주제도의 폐지에 따른 입법론적 과제

정현수 忠北大學校 法科大學 法學硏究所 2005 法學硏究 Vol.16 No.1

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선분 분할 탐지를 활용한 마스크 된 이미지 내의 물체 6자유도 자세 추정

정현수,황면중 제어·로봇·시스템학회 2022 제어·로봇·시스템학회 논문지 Vol.28 No.6

In this paper, for accurate grasping of objects, we propose a pose estimation algorithm that recognizes a three-dimensional object model within the mask area of the object detected by Mask R-CNN and estimates the 6D (degrees of freedom) pose of several instances. In industrial sites, it is challenging to determine the exact grasping position of small objects that lack characteristics when numerous parts are stacked. The proposed algorithm solves this problem by calculating the 6D pose of an object using the vertex detected from the contour of the object plane obtained from the image masked by instance segmentation. A line segmentation detection method in masked images based on low-cost RGB-D (Depth) cameras enables accurate pose estimation of objects for a robot gripper at high speed. The proposed method was verified through various experiments in an environment where rectangular objects were stacked. .