• KSII Transactions on Internet and Information Systems (TIIS)
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• v.8 no.12
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• pp.4568-4587
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• 2014

Authentication of videos and images based on the content is becoming an important problem in information security. Unfortunately, previous studies lack the consideration of Kerckhoffs's principle in order to achieve this (i.e., a cryptosystem should be secure even if everything about the system, except the key, is public knowledge). In this paper, a solution to the problem of finding a relationship between a frame's index and its content is proposed based on the creative utilization of a robust manifold feature. The proposed solution is based on a novel semi-fragile watermarking scheme for H.264/AVC video content authentication. At first, the input I-frame is partitioned for feature extraction and watermark embedding. This is followed by the temporal feature extraction using the Isometric Mapping algorithm. The frame index is included in the feature to produce the temporal watermark. In order to improve security, the spatial watermark will be encrypted together with the temporal watermark. Finally, the resultant watermark is embedded into the Discrete Cosine Transform coefficients in the diagonal positions. At the receiver side, after watermark extraction and decryption, temporal tampering is detected through a mismatch between the frame index extracted from the temporal watermark and the observed frame index. Next, the feature is regenerate through temporal feature regeneration, and compared with the extracted feature. It is judged through the comparison whether the extracted temporal watermark is similar to that of the original watermarked video. Additionally, for spatial authentication, the tampered areas are located via the comparison between extracted and regenerated spatial features. Experimental results show that the proposed method is sensitive to intentional malicious attacks and modifications, whereas it is robust to legitimate manipulations, such as certain level of lossy compression, channel noise, Gaussian filtering and brightness adjustment. Through a comparison between the extracted frame index and the current frame index, the temporal tempering is identified. With the proposed scheme, a solution to the Kerckhoffs's principle problem is specified.

• ETRI Journal
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• v.37 no.6
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• pp.1251-1258
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• 2015

We investigate an image recovery method for sparse-view computed tomography (CT) using an iterative shrinkage algorithm based on a second-order approach. The two-step iterative shrinkage-thresholding (TwIST) algorithm including a total variation regularization technique is elucidated to be more robust than other first-order methods; it enables a perfect restoration of an original image even if given only a few projection views of a parallel-beam geometry. We find that the incoherency of a projection system matrix in CT geometry sufficiently satisfies the exact reconstruction principle even when the matrix itself has a large condition number. Image reconstruction from fan-beam CT can be well carried out, but the retrieval performance is very low when compared to a parallel-beam geometry. This is considered to be due to the matrix complexity of the projection geometry. We also evaluate the image retrieval performance of the TwIST algorithm -sing measured projection data.

• The Korean Society of Law and Medicine
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• v.23 no.1
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• pp.3-33
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• 2022

In relation to telemedicine in Korea's medical law, there are Articles 17, 17-2, and 34 of the Medical Act. Since 'direct examination' in Articles 17 and 17-2 of the Medical Act can be interpreted as 'self-examination' rather than 'face-to-face examination', it is difficult to see the above regulation as a regulation prohibiting telemedicine. Prohibiting telemedicine only with the concept of medical examination or the 'principle of face-to-face treatment' is against the principle of "nulla poena sine lege"(the principle of legality). However, in order to qualify as 'examination', it must be faithful enough to replace face-to-face examination, so issuing a medical certificate or prescription after a poor examination over the phone is considered a violation of the Medical Act. In that respect, the above regulation can be said to be a regulation that indirectly limits telemedicine. On the other hand, most lawyers interpret that telemedicine between medical personnel and patients is completely prohibited based on Article 34, and the Supreme Court recently ruled that such telemedicine is not permitted even if there is a patient's request. However, this interpretation is not only far from the legislative intention at the time when telemedicine regulations were introduced into the Medical Act of 2002, but also does not match the needs of reality or the legislative trend of foreign countries. The reason is that telemedicine regulations are erroneously legislated. The premise of the legislation is wrong, and there are considerable problems in the form and content of the legislation. As a result, contrary to the original legislative intent, telemedicine was completely banned. In foreign countries, it is difficult to find cases where telemedicine is completely banned and criminal punishment is imposed for it. In order to fundamentally solve the problem of telemedicine, Article 34 of the Medical Act needs to be deleted.

• Journal of Korean Society of Archives and Records Management
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• v.12 no.3
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• pp.203-232
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• 2012

The study aims at reviewing research trends of records classification and archival arrangement, analysing issues, and suggesting futures tasks in related research area. It starts with defining research categories of records and archives classification through analysing the term of 'classification' being found in the Public Records Management Act. Thirty five research papers which are covering classification of records and archives and published in 1980's are selected for contents analysis. Considering the analysis of domestic and foreign research, and the practical needs, it makes clear the issues and tasks for future research. The study concludes with emphasizing more empirical research for guiding records and archives management and reformulating archival theories in electronic environments.

• Journal of the Daesoon Academy of Sciences
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• v.26
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• pp.77-110
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• 2016

The purpose of this article is to study on the Correlative linkage between the cosmic principle of birth-growth and contraction-recess and the Non action Tao. The split time between birth-growth and contraction-recess is the conflict between the Prior Time and Posterior Time as the Great Renewal. The cycle of this Chaotic Renewals is the cycle of a cosmic circulation as 129,600 years. In relation to the correlative linkage of function, Jeong-san Sangje governs all the beings of the universe by means of the cosmic principle birth-growth and contraction-recess. Also Jeong-san Sangje, using the Non action Tao governing all the beings of the universe and let them exist as the original selves. Thus, the two necessities are mutual interdependent and mutual complementary. In relation to the correlative linkage of substance, Jeong-san Sangje is included in the cosmic life which forms of all the existences. That is personal God of Jeong-san Sangje that is a part of the cosmic life. So that Jeong-san Sangje is included in the cosmic life, the basis of all the cosmic affairs. He is also subordinate to the cosmic principle but he simultaneously governs it. Jeong-san Sangje is trans-versal mediator between the cosmic principle and the cosmic life of Non action Tao, since it is the origin of his mind. To understand the nature of Jeong-san Sangje who becomes one with the cosmic life, the old causal way of thinking which inquires the timely order and seeks for causes and effects should be abandoned. The new way of thinking is thus different from the old one. The core of cosmic life is abstracted as the essence-energy and god-blood. This structure is similar to the cosmic principle of birth-growth and contraction-recess. The death is a kind of event caused by the depletion of the essence, and all beings could altered into the god. It also would be returned to the natural birth place of the cosmos, as it were, that can be called the 'Return to the Origin'. As the cosmos goes to the new epoch, humans have been living together with the cosmic principle. Now we can expect the Posterior Time to open to humans as cosmic life of Non action Tao.

• Journal of the Korean Society of Costume
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• v.15
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• pp.21-45
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• 1990

The purpose of this thesis is to study the method of the reasonable pattern design. The studying method is based on the original principle of the trousers' cutting and I have a hypothesis about the trousers pattern which should be proved. When I selected the practical method, I made use of the international measuring rule, graph paper and tracing paper, in order to prove the new pattern design. The reasonable pattern design should be the one of the suitable original principles to be suited in the design through any measurement. Therefore, I have discussed the above mentioned design. I find out the conclusion to prove the hypothesis of pattern design with the experimental measure after showing the above mentiond design. The characteristics is as follows. First : To be convinient when walking, because of little degree as folding of the front part of trousers with the under-angle. Second : To be suitable in proportion to the length of trousers and the under-angle. Third ; When folding the center line of the Sapok (a name of one of the trousers parts), the length of the Sapoks is same and harmonized with the Sapoks because of the same angle of both Sapoks in any case of the measurement. Fourth : No correction of the lines when dressing, for the same points of the large Sapok and the small one. Fifth : To be easiness of the pattern design through the concrete measurement. I could find out a little extent errors of pattern showings, an easiness of dressing, scientification of formation in Korean trousers and standard of the practical measurement in the program to be presented as the result of studying.

• Journal of Environmental Science International
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• v.27 no.8
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• pp.711-721
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• 2018

In order to address housing issues, alleviate the concentration of urban populations, and resolve other issues regarding residential spaces, large residential complexes have been developed in Korea since the 1970s. The changes to the residential culture due to such development projects propagated rapidly, making the apartment complexes the most representative form of housing in Korea. In developing such large-scale complexes, plans for public open spaces, which play an important role in formulating the quality of residential environment, have been mostly the same, only utilizing the spaces remaining after planning other types of spaces. The current study looks at the case of Tama New Town development project, a Japanese new town development project that has a similar public open space system in large scale residential complex development projects in Korea. In doing so, the current study aims to identify the features of public open space plans. In the conclusion, the study first finds that various public open spaces must be reviewed and introduced in term of predicting social demands. Second, the study suggests the policy-makers should actively introduce pedestrian paths as a public open space. Third, the study deduces the planning implications of applying the principle of original landscape preservation.

• Journal of the Korean Operations Research and Management Science Society
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• v.27 no.4
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• pp.41-65
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• 2002

We study a multi-component production/inventory system in which individual components are made to meet various demand types. We assume that the demands arrive according to a Poisson process, but there is a fixed probability that a demand requests a particular kit of different components. Each component is produced by a flow line with several stations in which the processing times of each station follow a two-stage Coxian distribution. The production of each component is operated by an independent base-stock policy with blocking. We assume that the time needed to assemble final products follows a general distribution and the capacity of an assembling facility is sufficiently large. The objective of this study is to obtain key performance measures such as the distribution of the number of each orders for each final product and the mean time of fulfilling a customer order. The basic principle of the proposed approximation method is to decompose the original system into a set of subsystems, each subsystem being associated with a flow line. Each subsystem is analyzed in isolation using a Marie's method. An iterative procedure is then used to determine the unknown parameters of each subsystem. Numerical results show that the accuracy of the approximation method is acceptable.

• Journal of Korea Trade
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• v.26 no.7
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• pp.93-108
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• 2022

Purpose - This paper examines the admissibility of restitution as the legal consequence where a contract is frustrated under the Law of Reform (Frustrated Contracts) Act 1943 in comparison with Korean Civil Code (KCC). In order to provide practical guidelines and advice regarding choice of and application of law for contracting parties in international trade, the paper comparatively evaluates requirements and the scope of restitution under the Act 1943 and KCC. Design/methodology - This paper executes a comparative study to analyze whether the parties may claim restitution of money paid or non-money benefit obtained before or after the time of discharge under English law and KCC. To achieve the purpose, it focuses on the identifying characteristics of each statute, thereby providing guidelines to overcome difficulties in legal application and interpretation as to restitution as the consequence of frustration. Findings - Under English law, the benefit may be restituted according to Art 1943 or the common law rule, mistake of fact or law. Under the KCC, restitution is considered based on the principle of the obligation to recover the original obtained regardless of the time when the benefit is conferred. Whilst Act 1943 does not require careful analysis of the grounds of restitution, requirements to justify restitution according to the principle of unjust enrichment, mistake of fact or law, and the KCC should be met. Meanwhile, the KCC may provide more opportunities to award restitution because it does not require the burden of proof related to the defendant's good faith, unlike the principle of unjust enrichment. Originality/value - Where the contract is frustrated by the effect of COVID-19, one legal issue is a consequence of frustration. Therefore, this paper analyzes requirements and the scope of restitution under English law as compared with the KCC in a timely manner. It provides contracting parties with practical guidelines and advice to reduce unpredictability when they choose the governing law in a contract.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.32 no.6
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• pp.211-218
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• 1983

In this paper, an attempt is made to match the continuous state trajectory of the digital control system with that of its continuous data model. Matching the state trajectories instead of the output responses assures that the performances of the internal variables of the plant as well as the output variables are preserved in the discretization. The mathematical tool used in this research is an extended maximum principle of the Pontryagin type, which enables one to synthesize a staircase type of optimal control signals, such as the output signal of a zero-order hold asociated with a digital controller. A general mathematical expression of the digital controller which may be used to replace the analog controller of a general system while preserving as mauch as possible the performance characteristics of the original continuous-data control system is derived in this paper.