• Review of KIISC
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• v.29 no.6
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• pp.5-12
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• 2019

Full Disk Encryption(FDE)과 File Based Encryption(FBE)는 파일 디스크를 암호화하는 방식으로 안드로이드에서는 연락처, 문자 등의 사용자 데이터가 저장되는 데이터 파티션(/data)에 적용된다. FDE는 파티션 전체를 하나의 키로 암호화하는 방식이나 FBE는 2개 이상의 키로 파티션을 나누어 암호화한다. 이러한 FDE와 FBE는 기기 분실 및 도난 시 개인 정보 유출 피해를 방지할 수 있으나, 디지털 포렌식 수사 과정에서 증거 데이터 수집 및 분석을 어렵게 한다. 따라서 디지털 포렌식 관점의 FDE. FBE 분석 및 복호 방안에 관한 연구가 필요하다. 본 논문은 기존 FDE와 FBE의 복호 및 안전성 연구를 정리하고, 매년 FBE FDE가 보완되어 탑재되는 새로운 안드로이드 버전에 발맞춘 꾸준한 분석의 필요성을 시사한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.677-678
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• 2009

USB메모리의 분실 및 도난을 통하여 개인정보 유출 사건이 증가함에 따라 보안USB 솔루션이 개발되어 사용자들에게 제공되고 있다. 이러한 보안USB 솔루션은 비밀번호를 기반으로 사용자 인증을 제공 하고 있어 비밀번호 분실 시 보안영역에 접근할 수 없는 불편함을 가지고 있다. 이를 해결하기 위해 여러 보안USB 솔루션에서 서버를 이용한 비밀번호 백업/복구 서비스를 제공하지만 이 또한 네트워크에 연결되어 있지 않은 클라이언트에서 비밀번호를 변경 시 변경된 비밀번호가 서버에 동기화 되지 못하는 문제가 발생되고 있다. 따라서 본 논문은 Off-Line 환경에서 변경된 비밀번호를 USB메모리에 안전하게 저장한 뒤 On-Line 환경으로 변경 시 변경된 비밀번호를 서버와 동기화 하는 방법을 제시한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.1432-1435
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• 2009

최근 모바일 단말기의 급격한 발전으로 인해 단말기에 유입되는 정보의 중요성이 더욱 부각되고 있다. 분실 혹은 도난 시 발생하는 사고는 서비스 과다 사용으로 인한 금전적인 피해뿐만 아니라 사용자 정보 유출 등으로 인한 정신적인 피해, 개인정보를 악용한 협박 등의 범죄로 점차 발전하여 그 심각성은 나날이 더해가고 있는 실정이다. 본 논문에서는 모바일 단말기와 이동통신사간의 상호인증을 통하여 원격제어 권한을 얻어 사용자 정보를 판독 불가능 상태 혹은 삭제할 수 있게 하여 외부 노출 시 안전하게 보호할 수 있게 하고, 이동통신사를 통해 사용자 정보를 안전하게 수집하여 향후 원래 상태로 완벽하게 복구할 수 있는 시스템을 제안한다.

• Journal of Digital Convergence
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• v.13 no.12
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• pp.285-290
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• 2015

The purpose of this study is to compare the status of eyesight according to the change of astigmatism axis in myopic astigmatism and to minimize errors in making astigmatic glasses based on accurate optometry and prescription. The subjects were 93 males and females(186 eyes) who have myopic astigmatism without any ocular disease or systemic disease. We performed comparative analysis on the status of visual acuity according to the change of astigmatism axis to 5, 10 and 15 degree in corrected eyesight 1.0. The direct astigmatism was the most common astigmatism type among the 186 eyes. After all subjects were perfectly corrected into 1.0, the change of astigmatism axis affected eyesight; The results suggested that the more change was made in astigmatism axis, the worse their eyesight would become. The main astigmatism type was changed from direct astigmatism to inverse astigmatism as age increased. The change of the astigmatism axis resulted in failing of corrected eyesight. Therefore, the convergence of examination and correction for astigmatism strength and axis is necessary when conducting refraction inspection for astigmatism.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.04a
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• pp.695-698
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• 2012

개인정보보호법이 제정 및 시행됨에 따라서 고유식별정보를 처리하는 경우 그 고유식별정보가 분실, 도난, 유출, 변조 또는 훼손 되지 않아야 한다[1]. 하지만 현재 운송업계의 택배 서비스를 이용 시 고유식별정보가 고스란히 노출 되어있으며, 위 변조 또한 가능하다. 이러한 주소, 성명, 전화번호 등 개인을 식별할 수 있는 개인정보를 악용하여, 명의 도용이나 피싱 등의 심각한 문제가 발생될 수 있다. 현재 택배 시스템은 발신, 수신, 배송에 대한 사고 및 논쟁 발생 시 그에 따른 증거자료가 부족하기 때문에 책임이 불명확하다. 이를 사전에 방지하기 위해서는 관련된 증거를 생성, 수집, 유지, 활용, 검사하는 절차와 그 역할을 담당할 신뢰된 제3의 기관이 필요하다. 본 논문에서는 현재의 택배 시스템을 점검해 보고 개인정보보호 차원에서의 해결방안을 모색하는 것과 발신, 수신, 배송의 부인방지 서비스 적용을 목표로 한다.

• Journal of Korean Ophthalmic Optics Society
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• v.6 no.2
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• pp.53-57
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• 2001

The corneal structure and function changes somewhat with aging. We were performed the analysis of women college students on the base curve, power, and astigmatism axis of the cornea by keratometer. All women subjects were between the ages of 19 and 20 years. On the corneal base curve. the right eye of the ages of 19 was 7.64 mm in vertical and 7.81 mm in horizontal. But, the left eye was 7.65 mm in vertical and 7.83 mm in horizontal on the other hand, the right and left eye of the ages of 20 was 7.72 mm in vertical and 7.75 mm in horizontal. On the corneal diopter power, the right eye of the ages of 19 was 44.21 diopter in vertical and 43.32 diopter in horizontal. But, the left eye was 44.23 diopter in vertical and 43.24 diopter in horizontal. On the other hand, the right eye of the ages of 20 was 43.67 diopter in vertical and 43.62 diopter in horizontal. But, the left eye was 43.73 diopter in vertical and 43.6 diopter in horizontal. According to the corneal astigmatism axis style, the right eye of the ages of 19 have 83% positive for with the rule astigmatism, and 16% positive for against the rule astigmatism. But, the left eye of the ages of 19 have 86% positive for with the rule astigmatism, and 12% positive for against the rule astigmatism. On the other hand, the right eye of the ages of 19 have 56% positive for with the rule astigmatism, and 44 % positive for against the rule astigmatism. But, the left eye of the ages of 20 have 56% positive for with the rule astigmatism, and 41% positive for against the rule astigmatism. According to the diopter power of corneal astigmatism. The right eye of the ages of 19 have 36% positive for behind 1 diopter and left eye have 31%. But, the right and left eye of the ages of 20 have 37.5%. The right and left eye of the ages of 19 have 42% positive for 1 diopter, and the right eye of the ages of 20 have 34.4% positive for 1 diopter and the left eye have 43.8%. The right eye of the ages of 19 have 12% positive for 2 diopter and left eye have 22%. But, the right eye of the ages of 20 have 15.6% positive for 2 diopter and the left eye have 12%. The right eye of the ages of 19 have 4% positive for 3 diopter and left eye have 3%. But, the left eye of the ages of 20 have 3% positive for 3 diopter and the left eye have 6%. On the other hand, the right eye of ages of 19 have 6% positive over 4 diopter, and the left eye have 2%. But, the right eye of ages of 20 have only 9% positive over 4 diopter.

• Journal of Korean Ophthalmic Optics Society
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• v.9 no.2
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• pp.439-446
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• 2004

Many studies have reported that retinal defocus cause and increase refractive error specially myopia. Uncorrected astigmatism may be one factor of retinal defocus factors. To understand the relationship between myopia and astigmatism 62 college students were participated in this study. Spherical refractive error and astigmatism were measured using N-vision 5001 autorefractor (Shinnippon). Co-relations between spherical refractive error and astigmatism were high both in the with-the-rule astigmatism group(r=0.53; ANOVA F=32.40, N=87, P<0.05) and oblique astigmatism group (r=0.53ANOVA F=5.14, N=15, P<0.001). However it was very low (r=0.09; ANOVA F=0.18, N=22, P<0.001)in the against-the-rule stigmatism group. In the total group co-relation was also high (r=0.56: ANOVA F=77.80, N=173, P<0.001). Uncorrected astigmatism may cause and increase spherical refractive error.

• Journal of Korean Ophthalmic Optics Society
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• v.13 no.1
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• pp.77-81
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• 2008

Purpose: This study was to investigate the refractive state of an asian population (male: 39, female: 53) from 21 to 30 years old who visited the A optical shop at jongnogu in seoul. Methods: The visual acuity test was performed by the object and subject method. Results: Among the 184 eyes, myopia is 83.16% and emmetropia is 16.84%, respectively. As for the equivalent spheric power of myopic abnormal refractive eyes, the -m0.5Dt < spheric equivalent ${\leq}$ -2.00Dt was 40.53%, the -2.00Dt < spheric equivalent ${\leq}$ -6.00Dt was 51.63% and anything over the -6.00Dt was 7.85%. The percentages of with-the-rule, against-the-rule and oblique astigmatism among people with astigmatism were 46.67%, 35.56% and 7.77%, respectively. The average of pupillary distance in male (64.5${\pm}$2.9 mm) was greater than that in female (61.9${\pm}$2.3 mm). Conclusions: Korean opticians were provided some useful information about making up a prescription by this research.

• Journal of Korea Multimedia Society
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• v.6 no.3
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• pp.469-480
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• 2003

The accurate user- authentication technology is being raised as one of the most important in this current society, which is, so called, information society. Most authentication technology is used to identify users by using the special characteristics of users. This paper has established an e-commerce shopping mall based on conventional e-commerce systems. It also suggested and established the user authentication interface that uses the mouse gesture, which is the new authentication of what users have. The user authentication interface using the mouse gesture generates the status of recognition directly on the screen by comparing the stored pattern values with the unique pattern values that users entered. When users purchase products through the shopping mall and enter their another signature information together with payment information, security can be more increased. Experimental results show that our mouse gesture interface may be useful to provide more security to e-commerce server.

• Smart Media Journal
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• v.5 no.4
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• pp.131-137
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• 2016

Since the phenomenon that the consumers slip important calls since they do not know the receiving information of the smart phone in spaces which smart phones can not be carried, the development of technology to solve this problem is urgent and the cases of burglary and losses of smart phones during hobby and recreation life are increasing and especially since burglary behaviors are occurring much in places such as bathing resort, swimming pool, Korean dry sauna, sauna and spa etc, the schemes to protect smart phones during hobbies and recreation life is needed. Since the smart watch, the conventional wearable device are high price machines and due to the burden about A/S costs for the damage or failure of the machine during exercise, hobbies and recreation activities, the burden about the use is high, development of products which can reduce such burden and emphasize the usefulness is urgent and in order to solve this problem, the added value and psychological repercussion effect will be very high in areas of smart phone users and utilizing them by developing the system which can know if the smart phone has received calls at least in places where smart phones can not be carried.