스마트폰 뱅킹에서 사용하는 보안카드의 안전성 강화방안

이현종, 조인준 배재대학교 공학연구소 2014 공학논문집 Vol.16 No.1

전 세계적으로 스마트폰이 보급되면서 스마트폰을 활용한 여러 가지 서비스가 증가하고 있다. 다양한 앱의 개발 및 소셜 네트워크 서비스 등으로 사용자에게 편리성을 제공하고 있으나, 그 취약점 또한 해결해야할 하나의 과제이다. 그중에서도 스마트폰 뱅킹은 이미 그 가입자수가 상당수에 이름에도 스마트폰 뱅킹 니즈의 부재, 보안문제와 정보 유출 가능성에 대한 우려로 사용을 기피하고 있다. 특히 스마트폰 뱅킹에 사용되는 보안카드는 사용자의 편의를 위해 메모나 사진으로 저장하여 사용하고 있는 실정이며 이는 해킹에 의해 그대로 노출될 수 밖에 없다. 스마트폰 뱅킹은 스마트폰으로 플랫폼은 변경되었으나 인증방식은 기존의 PC 기반의 인터넷 뱅킹 인증방식을 도입하여 취약점을 그대로 갖고 있다. 특히 보안카드와 관련한 보안방식은 미흡한 실정이다. 본 논문에서는 스마트폰 환경에서 안전하게 보안카드를 사용할 수 있는 방안을 제시한다. 제안한 방안은 패스워드 기반의 암호화로 시스템에 접속시마다 키값이 변경되어 보안카드를 암호화하므로 보안의 강도를 높였고 노출의 우려가 없다.

합성 다이아몬드(diamond)의 열적열화(熱的劣化)현상에 대한 연구

현준원 단국대학교 1996 論文集 Vol.30 No.-

We have investigated thermal degradation behavior of thermally resistant, single crystalline synthetic diamond grains under high-strength. During heat-treatment at high temperature, cracks begin to occur at the interface between inclusion and diamond prior to melting of the inclusions. Cracks form initially at the site of inclusions and are kept to the high temperature. The crack propagates along the {111} plane. The cracks generated during heat-treatment decrease a loadability of grains.

합성 다이아몬드의 자기적 특성에 관한 연구

현준원 단국대학교 신소재기술연구소 1997 신소재 Vol.7 No.-

고온·고압에서 Fe-Co, Fe-Ni 및 Mn-Ni 계로부터 합성된 다이아몬드의 자기적 특성에 대해 연구하였다. Mn-Ni 계는 Fe-Co와 Fe-Ni 계보다 용해온도가 낮기 때문에 금속함유물을 많이 포함하며, Fe-Co와 Fe-Ni 계의 다이아몬드 분말이 강자성을 띄는 반면 Mn-Ni계의 다이아몬드 분말들은 약상자성을 나타낸다. 따라서 합성 다이아몬드의 자기적 특성은 촉매금속과 온도에 크게 의존하게 된다. We have Investigated magnetic properties of diamond synthesized by Fe-Co, Fe-Ni and Mn-Ni sonvent alloys on high temperature, high pressure. Because melting point of Mn-Ni system is lower than Fe-Co and Fe-Ni system, it contains metal inclusions. The magnetic properties of synthetic diamonds depend on catalyst and synthetic temperature largely.

단결정 합성 다이아몬드(diamond)의 함유물과 강도

현준원 단국대학교 신소재기술연구소 1995 신소재 Vol.5 No.-

Fe-Co-C계와 Mn-Ni-C 계의 촉매를 써서 합성한 단결정 합성 diamond의 함유물이 강도에 미치는 영향을 연구하였다. 금속촉매를 사용하여 합성한 diamond 결정들은 방향족 함유물과 위치 함유물을 포함하며, 이러한 함유물은 diamond 결정을 균열시켜 강도를 크게 감소 시키게 된다. 방향족 함유물을 지닌 Fe-Co-C계의 결정들이 위치 함유물로 특징 되어지는 Mn-Ni-C계의 diamond 결정보다 강도 면에서 우수함을 관찰하였다. 낮은 내열성 온도와 큰 열팽창이 합성 diamond의 강도를 감소시키며, 결정의 강도는 합성 온도에 의존한다. Inclusion of synthetic diamond monocrystals synthesized by Fe-Do-C and Mn-Ni-C systems were studied to examine the strength of diamonds. Diamond crystals synthesized by solving alloy contain the oriented and local inclusions. Because of these inclusions, diamond crystals easily crack and their strength decreases enormously. As for as concerned with the strength, crystals of Fe-Co-C system of the oriented inclusions were observed more excellent than diamond crystals of Mn-Ni-C. Due to the low-resistant temperature and large thermal-expansion coefficient, the strength of synthetic diamonds decreases and depends on the synthetic temperature.

원형구멍과 원형 강체개재물에 의한 2차원 탄성파 산란현상의 주파수 해석

任賢準,金雄起 弘益大學校 科學技術硏究所 1997 科學技術硏究論文集 Vol.8 No.-

The characteristics of elastic waves scattered from a circular hole and circular rigid inclusion have been studied. It was found that the shape of partial waves of the scattered elastic waves change according to the property and size of the scatterer. It was observed that the peaks and dips in the partial scattered waves from a circular hole and those from a rigid inclusion are switched. It was also found that as the radius of scatterers increases, the modulus of the partial waves increases and the peak-to-peak frequency intervals decrease. The relation between scattering from a circular hole and a rigid inclusion, and their resonance was addressed in terms of circumferential waves around the scatterers. The result of this can be utilized as a good foundation for elastic wave scattering from elastic inclusions of similar geometrical shape.

순막조건화에서의 적핵과 소뇌 중간핵의 기능

김현택,최준식,김기석 한국심리학회 1996 한국심리학회지 생물 및 생리 Vol.3 No.1

토끼 순막조건화에 관여하는 뇌간과 소뇌의 구조물들의 기능을 검토하고자 뇌간의 대표적 운동핵인 적핵과 소뇌의 심부핵 중 하나인 중간핵을 연구대상으로 선정하였다. 실험 1에서는 조건자극으로 400msec동안의 정현파 청각자극을 제시하고 무조건자극으로는 뇌간의 운동핵이며 순막반응의 출력핵이라고 알려진 적핵에 자극용 전극을 삽입하여 전기자극을 가함과 동시에 각막 공기분사를 복합적으로 제시하면서 전형적인 지연조건화를 시켰다. 그리고 소거시에는 조건자극과 함께 적핵전기자극만을 제시하였다. 이와함께 조건반응의 신경적 가소성 형성의 후보구조물로 알려진 중간핵에 기록용 전극을 삽입하여 조건화동안의 중간핵 뉴런들의 다단위 활동을 기록하였다. 실험 결과 적핵자극은 조건화의 습득과 소거에 유의미한 영향을 미치지 못하였다. 따라서 적핵은 순막조건화에서는 단순운동 출력핵임을 확인하였다. 그와 함께 소뇌 중간핵에서의 다단위활동의 기록은 이 핵이 조건반응이 형성되는 가소성구조물 또는 그 출력을 받는 구조물임을 입증해 주었다. 실험 2에서는 조건자극 및 무조건자극복합은 실험 1과 동일하게 하였다. 단지 소뇌 중간핵에 자극전극을 삽입하여 전기자극을 가하면서 조건화를 시킨 점만 다를 뿐이다. 결과를 보면 중간핵을 자극하면 순막조건화의 습득에서 유의미한 지체를 보였고 소거에서 유의미한 촉진을 보였다. 이는 중간핵이 조건반응의 형성 및 해제에 중요한 역할을 하는 구조물임을 시사하는 것이다. The red nucleus and the cerebellar interpositus nucleus were successively investigated in terms of multiple plastic structures mediating the classical conditioning of the rabbit's nictitating membrane response (NMR). In experiment 1, monopolar tungsten stimulating electrodes and low-impedance monopolar tungsten recording microelectrodes were chronically implanted into the red nucleus and the interpositus nucleus respectively. All animals were trained with delay conditioning paradigm. In order to investigate any involvment of the red nucleus in the conditioning of NMR, animals of the experimental group were trained with the tone conditioned stimulus (CS) (400msec, 1㎑, 85㏈, sine wave) and unconditioned stimulus (US) consisted of the electrical stimulation of the red nucleus (100msec, 400㎐, pulse width 0.1msec, 60~150㎂) and simultaneous corneal airpuff(100msec, 100g/㎠) in the five aquisition sessions. In two successive extinction sessions, the animals were trained with the tone CS and the electrical stimulation US of the red nucleus alone. Animals of the control group were trained with the tone CS and the corneal airpuff US in the same aquisition sessions and with the tone CS alone in the same extinction sessions. Results showed that the electrical stimulation US of the red nucleus neither facillitates the learning rate in the aquistion stage nor maintains the conditioned response(CR) in the extinction stage. It may be concluded that the red nucleus is a mere output structure and is not an essential one in the neural network mediating the conditioning of NMR. Multiple unit activity(MUA) recorded from the cerebellar interpositus nucleus was processed to 16msec-bin histogram and the NMR was averaged in each session. The averaged NMR was highly correlated with the histogram and the histogram of MUA preceded the averaged NMR. This supports the previous reports that the cerebellar interpositus nucleus may be the neural substrate of the conditioning of NMR. In experiment 2, stimulating electrodes and recording microelectrodes were chronically implanted into the cerebellar interpositus nucleus and the red nucleus respectively. All training methods were identical with the experiment 1, except for exchanging the stimulating target structure for the recording one. Results showed that the electrical stimulation US of the cerebellar interpositus nucleus severely retarded the aqusition of the CR. It is concluded that the cerebellar interpositus nucleus may be a structure of plasticity included in an essential neural network mediating the conditioning of NMR. Possible interpretations of the result, concerning the side effect of the electrical stimulation and the function of the inferior olive-cerebellar cortex-interpositus nucleus-inferior olive recurrent loop, are discussed.

전통음료 인지도에 관련된 제요인 분석

이현주,손경희,이민준 한국식생활문화학회 2001 韓國食生活文化學會誌 Vol.16 No.5

Traditional Korean beverage can be divided into Jang, Gahl Soo, Mi Su, Mil Su, Soo Jung Gwa, Shick Hae, Tahng, Hwa Chae, Sook Su, and Tea according to ingredients and how it is proccessed. The purpose of this study was to investigate the Korean beverage percetpion and to analyze the factors(sociodemographic factors and life-style related factors) which influence percetpion of Korean beverage. Questionnaries were hand delivered to 2,200 subject residing in Seoul and 1,884 questionnaris were collected : resulting in 84% response rate. Statistical data analysis was completed using SAS Package program for the analysis of covariance(ANOCOVA). The results are as follows: (a) Survey on Korean beverage perception showed that the recognition rates of Shick Hae(58.4%), Cition Tea(53.5%), Sung Nung(48.7%) and Soo Jung Gwa(40.8%) were high, whereas those for Tahng, Jang, and Gahl Soo were low. (b) About 40% of respondents performing 4 kinds of Korean traditional ceremony a year. The percentage that reported they purchased Korean beverages was 44.0%, higher than the 38.5% that answered they made Korean beverage at home. (c) In analyzing the factors which influence beverage perception, the sociodemographic factors variously influenced perception rate depending on beverage. Age and sex had influenced on perception rate of Shick Hae and Donggulre Tea. Income level influenced on the perception rate of Sung Nung and Citron Tea. Sociodemograhpic factors like senior over 50s, female and extended family size had positive influence on the perception rate

직류 전철 계통의 정류기용 몰드변압기 안전성에 관한 연구

주현정,박현준,김경화 서울産業大學校 2005 논문집 Vol.54 No.3

Electric railroad transformer of a supply of Operation power of DC electric cars is intense Fluctuation of load and flows the only big short-circuit current as a accident of the power system, it is a peculiarity more severe than general power transformer. Consequently, researches the properties about the rectifier mold transformer of DC substation and applies with data of safety of the electric railroad transformer. This paper analyzed a failure mode, the accident occurrence scenario and the be latent dangerous unit against the rectifier mold transformer of DC railway system.

만성 B형 간염 환자의 급성 악화 후 발생한 피부 결절 다발동맥염과 류마티스관절염

이주현,김민,이준성,장선희,윤보영,이윤우 인제대학교 2009 仁濟醫學 Vol.30 No.-

Cutaneous polyarteritis nodosa(CPAN) is a rare vascular disorder that affects small and medium-sized arteries in the reticular dermis and subcutaneous tissue. It has been described as a distinct clinical entity with benign and a chronic prolonged course without systemic involvement. Hepatitis B virus-related polyarteritis nodosa (HBV-related PAN) is typical form of classic PAN. Its pathogenesis is not well known, but considered an immune complex-mediated disease. The patients with HBV-related PAN often present with malignant hypertension, orchitis, and vascular nephropathy. But, HBV-related CPAN has been rarely reported. Rheumatoid vasculitis is a complication of rheumatoid arthritis that can be lead to variety of clinically significant skin and systemic conditions, It has been reported before or at the time of rheumatoid arthritis diagnosis but is usually seen an average of 10 to 14 years after arthritis onset. The histological features of cutaneous vasculitis in rheumatoid arthritis overlapped both the characteristics of cutaneous necrotizing venulitis and cutaneous polyarteritis nodosa. But polyarteritis nodosa-like rheumatoid vasculitis has rarely been reported. We report a case of rheumatoid arthritis and cutaneous polyarteritis nodosa in a chronic hepatitis B with acute exacerbation.

제주 자생 식물 추출물의 타이로시네이즈 효소 저해 효능 연구

김준현 水原大學校 2018 論文集 Vol.32 No.-

It has been well known Jeju Island, the southern part of Korea has still unexplored natural plants of potential therapeutic importance. To identify the new materials that brighten skin among the natural plants, we measured the inhibitory effects of tyrosinase activity with ethanol extracts of Cosmos sulphureus Cav flower, Brassica napus flower, Prunus serrulata var. spontanea flower, Arctium lappa, Helianthus tuberosus and Camelia japonica I. flower from Jeju Island. Cosmos sulphureus Cav. flower showed 67.84% inhibition of tyrosinase activity, whereas Prunus showed 24.19% inhibition, compared with Arbutin. Camelia japonica I. flower showed 0.92% inhibition. However, other flower extracts tested did not show inhibition. These results suggest Cosmos sulphureus Cav. and Prunus serrulata var. spontanea flower may have the powerful brightening effect that can be applied for developing a new skin product, however further studies are needed to identify effective component and study its physiological mechanism in the near future.