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$Al/{Al_2}{O_3}$금속복합재료의 기계적 성질과 피로거동
송정일,임홍준,한경섭,Song, Jeong-Il,LIm, Hong-Jun,Han, Gyeong-Seop 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.3
The metal matrix composites(MMC) are currently receiving a great deal of attention. These composites possess exellent mechanical and physical properties such as modulus, strength, wear resistance and thermal stability, which make them very attractive for use in automotive piston. In this study, $Al/{Al_2}{O_3}$(15%) composites are fabricated by the squeeze casting method. Mechanical properties such as tensile strength and ductility are performed at room and elevated temperature($250^{\circ}C$ and $350^{\circ}C$), respectively. Through thermomechanical analyser, thermal expansion coefficient of $Al/{Al_2}{O_3}$ composites are conducted for ranging from room temperature to ($400^{\circ}C$.And bending fatigue tests are also performed by the rotary bending machine at room temperature.The tensile strength and elastic modulus have been improved up to 38% and 35% by the addition of the reinforcements, respectively. Thermal expansion coefficients of MMCs which is located normal and parralel to the applied pressure are showed slightly different less than 10%. Fatigue strengh of the composite was improved by about 20% compared with that of unreinforced Al alloy. The results of this study will be used to understand the basic fracture behavior of MMCs and eventually to expand the applocation of MMCs as a machine parts undertaken various loadings.
송정은(Jeong Eun Song),한동국(Dong-Guk Han),이문규(Mun-Kyu Lee),최두호(Dooho Choi) 한국정보보호학회 2009 정보보호학회논문지 Vol.19 No.2
NTRU는 1990년대 Hoffstein 등에 의해 제안된 격자(Lattice) 기반 공개키 암호체계로서 기존의 공개키 암호와 비교하여 동일한 안전성을 제공하면서 암호화 및 복호화 속도가 빠르며 양자 연산 알고리즘을 이용한 공격에도 강하다는 이점이 있어 많은 주목을 받고 있다. 본 논문에서는 단순 전력 분석 공격과 통계적 특성을 이용한 전력 분석공격인 상관계수 전력 분석 공격에 대한 NTRU의 안전성을 분석하고, NesC로 구현한 NTRU의 연산을 Telos 모트(mote)에서 수행시켜 측정한 전력 소모 데이터에 상관계수 전력 분석 공격을 적용하여 개인키 정보를 복원하는 실험 결과를 보인다. 또한 이러한 전력 분석 공격을 방지하기 위한 대응 방법을 제시한다. 먼저, 단순 전력 분석 공격을 방지하기 위해 연산 결과를 저장할 배열을 0이 아닌 수로 초기화 시키는 방법을 제안하고, 통계적 특성을 이용한 전력분석 공격을 방지하기 위해 연산 순서를 변경하거나 컨볼루션(convolution) 연산에 사용되는 피연산자들에게 무작위성(randomness)을 부여하여 같은 입력에 대해서 랜덤한 전력 소모를 보이도록 하는 방법을 제안한다. The NTRU cryptosystem proposed by Hoffstein et al. in 1990s is a public key cryptosystem based on hard lattice problems. NTRU has many advantages compared to other public key cryptosystems such as RSA and elliptic curve cryptosystems. For example, it guarantees high speed encryption and decryption with the same level of security, and there is no known quantum computing algorithm for speeding up attacks against NTRU. In this paper, we analyze the security of NTRU against the simple power analysis (SPA) attack and the statistical power analysis (STPA) attack such as the correlation power analysis (CPA) attack. First, we implement NTRU operations using NesC on a Telos mote, and we show how to apply CPA to recover a private key from collected power traces. We also suggest countermeasures against these attacks. In order to prevent SPA, we propose to use a nonzero value to initialize the array which will store the result of a convolution operation. On the other hand, in order to prevent STPA, we propose two techniques to randomize power traces related to the same input. The first one is random ordering of the computation sequences in a convolution operation and the other is data randomization in convolution operation.
미코플라스마에 의해 폐침범 없이 발생한 중증 급성 간염 1예
정한택 ( Han Taek Jeong ),오재영 ( Jae Young Oh ),송정은 ( Jung Eun Song ),김병석 ( Byung Seok Kim ),이창형 ( Chang Hyeong Lee ) 대한소화기학회 2017 대한소화기학회지 Vol.70 No.1
Mycoplasma pneumoniae (M. pneumoniae) is a major cause of community acquired respiratory infections. And it also causes a num-ber of extrapulmonary manifestations including cardiovascular, dermatological, musculoskeletal, and hematological systems. But, acute hepatitis without lung involvement is rare in adults. Here, we report a case of 32-year-old man who presented with fever, chilling, myalgia, and headache. Biochemical analysis showed severely impaired liver function and leukopenia. Laboratory tests and liver biop-sy demonstrated a hepatocellular pattern of M. pneumoniae-associated acute hepatitis. Clinical symptoms and laboratory parame-ters are improved rapidly under treatment with macrolide. Therefore, We recommend that phsycians should consider a possibility of M. pneumoniae infection in acute hepatitis without lung and extrapulmonary involvement, when other more frequent causes have been excluded. (Korean J Gastroenterol 2017;70:50-53)
동적 물성치를 고려한 진공 인터럽터 충격특성의 영향인자 분석
임지호,송정한,허훈,박우진,오일성,안길영,최종웅,Lim, Ji-Ho,Song, Jeong-Han,Huh, Hoon,Park, Woo-Jin,Oh, Il-Seong,Ahn, Gil-Young,Choe, Jong-Woong 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.5
Vacuum interrupters in order to be used in various switch-gear components such as circuit breakers, distribution switches, contactors, etc. spread the arc uniformly over the surface of the contacts. The electrodes of vacuum interrupters are made of sinter-forged Cu-Cr materials for good electrical and mechanical characteristics. Since the closing velocity is 1-2m/s and impact deformation of the electrode depends on the strain rate at that velocity, the dynamic behavior of the sinter-forged Cu-Cr is a key to investigate the impact characteristics of the electrodes. The dynamic response of the material at the high strain rate is obtained from the split Hopkinson pressure bar test using disc-type specimens. Experimental results from both quasi-static and dynamic compressive tests are Interpolated to construct the Johnson-Cook model as the constitutive relation that should be applied to simulation of the dynamic behavior of the electrodes. The impact characteristics of a vacuum interrupter are investigated with computer simulations by changing the value of five parameters such as the initial velocity of a movable electrode, the added mass of a movable electrode, the wipe spring constant, initial offset of a wipe spring and the virtual fixed spring constant.
한수진,송정모,Han, Su-Jin,Song, Jeong-Mo 사상체질의학회 2010 사상체질의학회지 Vol.22 No.4
1. Objectives The purpose of this study was to give an account of the effects of Sasang constitutional medicine and fasting therapy for the patient who has suffered from various signs or symptoms caused by psoriasis. 2. Methods The cases were one 50-year old man diagnosed as Taeeumin and one 29-year old man diagnosed as Soyangin. They all have the symptoms caused by psoriasis, such as rash, erythema, scaly skin, itching, etc. So we've recorded the progress of their symptoms as a score at the tables to check their conditions throughout the hospitalized period. We've diagnosed them as Soyangin, Taeeumin have prescribed Yangdokbaecho-tang and Galgeunhaegi-tang and have carried out fasting therapy. 3. Results and Conclusions The general condition of the patient have improved incredibly, where the each scores at the tables dropped from 4 to 0,1 and their symptoms like rash, erythema, scaly skin, itching, edema have almost disappeared at the end of the hospitalization period. This indicates that Yangdokbaecho-tang and Galgeunhaegi-tang can be used to treat main symptoms of psoriasis and fasting therapy can be used as a subsidiary therapy for the psoriasis.
소양인(少陽人) 처방을 활용한 성인형 아토피피부염 치험 1례(例)
한수진,송정모,Han, Su-Jin,Song, Jeong-Mo 사상체질의학회 2009 사상체질의학회지 Vol.21 No.3
1. Objectives: The purpose of this case study is to evaluate the effects of Sasang constitutional therapy and treatment of an adult atopic dermatitis patient, who was diagnosed Soyangin, Interior febrile disease induced from the stomach affected by heat(少陽人 胃受熱裏熱病). 2. Methods: The adult Atopic Dermatitis patient was diagnosed Soyangin, Interior febrile disease induced from the stomach affected by heat(少陽人 胃受熱裏熱病) which was based on his Nature & Emotion(性情), physical characteristics, symptoms. He was medicated with Prescriptions of Soyangin. 3. Results and Conclusions: The clinical evaluation was made by SCORAD index, Total eosinophil count and Total IgE. After treatment, his SCORAD results significantly decreased from 88.4 to 21.9, Total eosinophil count decreased from 1320 to 120 and Total IgE also decreased from 1406.6 to 897.3. And the patient's subjective symptom and gerneral condition considerably improved after treatment. This case study describe the effectiveness on adult Atopic Aermatitis symptom by using Prescriptions of Soyangin.
향부자팔물탕(香附子八物湯)을 활용한 소음인(少陰人) 수족번열증(手足煩熱證) 치험 1례
한수진,정성국,최대성,송정모,Han, Su-Jin,Jung, Sung-Kook,Choi, Dai-Sung,Song, Jeong-Mo 사상체질의학회 2011 사상체질의학회지 Vol.23 No.3
1. Objectives: The purpose of this study is to evaluate the effect of Hyangbujapalmul-tang(香附子八物湯) for hot flush on the palms and soles of the feet. 2. Methods: The patient was hospitalized from June 4. 2011 to June 18. 2011. The Patient Was treated with herbal medicine. The changes in symptoms can be diagnosed by the help of DITI(Digital Infrared Thermal Imaging) and VAS(Visual analogue Score). 3. Results By the use of Hyangbujapalmul-tang(香附子八物湯), this patient showed a positive response. We compared the temperature of palm with that of sole the feet on DITI. After the treatment, the symptoms and DITI, VAS results improved. The temperature of palms and soles of the feet after treatment were statistically lower than those before treatment. 4. Conclusions: We suggest that Hyangbujapalmul-tang(香附子八物湯) significantly has a curative effect on hot flush on the palms and soles of the feet patient with Soeumin.