• Title/Summary/Keyword: Space-shifting

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Place-shifting of TV Content by the Use of Slingbox and the Copyright (슬링박스를 이용한 TV프로그램의 장소이동 시청의 저작권법상의 성격)

  • Cho, Youn-Ha
    • The Journal of the Korea Contents Association
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    • v.13 no.7
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    • pp.158-167
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    • 2013
  • This research examines the legal liability of place-shifting of TV contents by the use of the Slingbox. The place-shifting of TV contents is fair use because it is a non-commercial private use based on the relevant case law regarding time-shifting and device-shifting such as Sony, RIAA and Napster. But the sharing of place-shifting function is likely to be liable for copyright infringement. And place-shifting may not be fair use based on the cases which denied fair use of time-shifting and space-shifting because the consumers' convenience for the use of the copyrighted work is against the purpose of legislation of copyright law. Place-shifting is unlikely to have a significant effect on the potential market for TV contents because it presents lucrative new platforms to disseminate TV contents to computers and mobile devices. However it is likely to have negative effect because various devices can be the follow-up marketplaces of the copyright holders of TV contents. This study proposes the "innovative medium defense," a new doctrine to analyze liability of innovative media.

Hierarchial Encryption System Using Two-Step Phase-Shifting Digital Holography Technology Based on XOR and Scramble Operations (XOR 및 스크램블 연산 기반 2단계 위상 천이 디지털 홀로그래피 기술을 이용한 계층적 암호화 시스템)

  • Kim, Cheolsu
    • Journal of Korea Multimedia Society
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    • v.25 no.8
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    • pp.983-990
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    • 2022
  • In this paper, we implemented a hierarchical encryption system using two-step phase-shifting digital holography(PSDH) technology based on XOR and scramble operations. The proposed encryption system is a system that authenticates access through the issuance of an encryption key for access to individual laboratories, department offices, and universities. In the encryption process, we proposed a double encryption method using XOR and scramble operation with digital technology and two-step phase-shifting digital holography with optical technology. In the two-step PSDH process, an new method of determining the reference wave intensity without measuring it by using random common object image gererated from digital encryption process was also proposed. In the decryption process, the process is performed in the reverse order of encryption process. And only when the various key information used in the encryption process is correct, the encrypted information can be decrypted, so that the user can access the desired place. That is, there is a feature that can hierarchically control the space that can be accessed according to the type of key issued in the proposed encryption system. Through the computer simulation, the feasibility of the proposed hierarchical encryption system was confirmed.

Three-dimensional relative-distance measurement by use of the phase-shifting digital holography (위상천이 디지털 홀로그래피를 이용한 3차원 상대 거리 측정)

  • Kim, Hyun;Lee, Yeon-H.
    • Korean Journal of Optics and Photonics
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    • v.14 no.2
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    • pp.200-207
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    • 2003
  • In this paper we present a new method of measuring the relative distance of two point objects in three-dimensional space by using phase-shifting digital holography. In our system the reference beam of a spherical wave is used instead of a plane wave. The system is computer simulated and built on an optical table for experiments. It is shown from computer simulations and experiments that the relative distance can be measured without the exact information on the reference beam used in the hologram record. It is shown from experiments that the relative distance between two point objects separated by 0.5 cm in the distance of about 300 cm from the CCD can be measured with an error less than 10%.

The study on the characteristics of space and the design method in the office by Gaetano Pesce (가에타노 페쉐 사무공간의 특성과 디자인 방법에 관한 연구)

  • Park, So-La
    • Korean Institute of Interior Design Journal
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    • no.34
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    • pp.37-44
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    • 2002
  • In the latter half of the 20th century, the rapid change into the information society changes the concept of workplace. Especially the new types of office space are appearing to accept interaction and flexibility, which are the representative features of the information society. Therefore, this study is to suggest the appropriate office environment in the information society shifting from the territorial to the virtual, after analyzing the characteristics of space and design method for the Chiat/Day advertising agency in New York (1995) that was designed by Gaetano Pesce. As a result, in terms of the constitution and the arrangement of space, the non-territorial and the virtual features appear, and in terms of the analysis of design elements, in which various semantic connotations are used, horizontal, pluralistic, and fluid features appear. This kind of analysis would be helpful in finding new alternatives for the rapidly changing office environment.

An Adaptive Decision-Directed Equalizer using Iterative Hyperplane Projection for SIMO systems (IHP 알고리즘을 이용한 SIMO 시스템용 적응 직접 결정 등화기 연구)

  • Lee Won-Cheol
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.1C
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    • pp.82-91
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    • 2005
  • This paper introduces an efficient affine projection algorithm(APA) using iterative hyperplane projection. Among various fast converging adaptation algorithms, APA has been preferred to be employed for various applications due to its inherent effectiveness against the rank deficient problem. However, the amount of complexity of the conventional APA could not be negligible because of the accomplishment of sample matrix inversion(SMI). Moreover, the 'shifting invariance property' usually exploited in single channel case does not hold for the application of space-time decision-directed equalizer(STDE) deployed in single-input-multi-output(SIMO) systems. Thus, it is impossible to utilize the fast adaptation schemes such as fast transversal filter(FlF) having low-complexity. To accomplish such tasks, this paper introduces the low-complexity APA by employing hyperplane projection algorithm, which shows the excellent tracking capability as well as the fast convergence. In order to confirm th validity of the proposed method, its performance is evaluated under wireless SIMO channel in respect to bit error rate(BER) behavior and computational complexity.

Development of a New Lunar Regolith Simulant using an Automated Program Framework

  • GyeongRok Kwon;Kyeong Ja Kim;Eungseok Yi
    • Journal of Astronomy and Space Sciences
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    • v.41 no.2
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    • pp.79-85
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    • 2024
  • Nowadays, the trend in lunar exploration missions is shifting from prospecting lunar surface to utilizing in-situ resources and establishing sustainable bridgehead. In the past, experiments were mainly focused on rover maneuvers and equipment operations. But the current shift in trend requires more complex experiments that includes preparations for resource extraction, space construction and even space agriculture. To achieve that, the experiment requires a sophisticated simulation of the lunar environment, but we are not yet prepared for this. Particularly, in the case of lunar regolith simulants, precise physical and chemical composition with a rapid development speed rate that allows different terrains to be simulated is required. However, existing lunar regolith simulants, designed for 20th-century exploration paradigms, are not sufficient to meet the requirements of modern space exploration. In order to prepare for the latest trends in space exploration, it is necessary to innovate the methodology for producing simulants. In this study, the basic framework for lunar regolith simulant development was established to realize this goal. The framework not only has a sample database and a database of potential simulation target compositions, but also has a built-in function to automatically calculate the optimal material mixing ratio through the particle swarm optimization algorithm to reproduce the target simulation, enabling fast and accurate simulant development. Using this framework, we anticipate a more agile response to the evolving needs toward simulants for space exploration.

Elimination of a Common Mode Voltage Pulse in Converter/Inverter System Modifying Space-Vector PWM Method (공간전압벡터 PWM을 이용한 컨버터/인버터 시스템에서의 커먼 모드 전압 펄스 제거)

  • Lee, Hyeon-Dong;Lee, Yeong-Min;Seol, Seung-Gi
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.48 no.2
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    • pp.89-96
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    • 1999
  • This paper proposes a common-mode voltage reduction method base on SVPWM(Space-Vector Pulsewidth Modulation) in three phase PWM converter/inverter system. By shifting the active voltage vector of inverter and aligning this to the active vector of converter, it is possible to eliminate a common-mode voltage pulse in one control period. Since the proposed PWM method maintains the active voltage vector, it does not affect the control performance of PWM converter/inverter system. Without any extra hardware, overall common mode voltage dv/dt and conrresponding leakage current can be reduced to two-third of the conventional three phase symmetric SVPWM scheme.

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Roughness Measurement Performance Obtained with Optical Interferometry and Stylus Method

  • Rhee Hyug-Gyo;Lee Yun-Woo;Lee In-Won;Vorburger Theodore V.
    • Journal of the Optical Society of Korea
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    • v.10 no.1
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    • pp.48-54
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    • 2006
  • White-light scanning interferometry (WLI) and phase shifting interferometry (PSI) are increasingly used for surface topography measurements, particularly for areal measurements. In this paper, we compare surface profiling results obtained from above two optical methods with those obtained from stylus instruments. For moderately rough surfaces ($Ra{\approx}500\;nm$), roughness measurements obtained with WLI and the stylus method seem to provide close agreement on the same roughness samples. For surface roughness measurements in the 50 nm to 300 nm range of Ra, discrepancies between WLI and the stylus method are observed. In some cases the discrepancy is as large as 109% of the value obtained with the stylus method. By contrast, the PSI results are in good agreement with those of the stylus technique.

A Study on the Extraction of Formal Vocabularies related with Form Generation in Space Design (형태생성과 연관된 공간디자인의 형태어휘 추출)

  • Choi, Eun-Hee
    • Korean Institute of Interior Design Journal
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    • v.16 no.6
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    • pp.65-76
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    • 2007
  • This research is progressed on the premise that there is a basic rule to organize a space in form generation process. In this study first, antecedent researches are inquired, and formal vocabularies related with form generation in space design are founded. Generally in the organizing process of spatial form designer could have selectively combined formal vocabularies consciously or unconsciously, and these formal vocabularies related with form generation are classified with 'formal elements' and 'spatial relationships'. First, as formal elements '2-dimensional line elements(rectilinear, oblique-linear, curvilinear)' are chosen. Second, formal vocabularies of 'spatial relationships' are 37 extracted from literatures related with architectural language or spatial language. Among them there are several vocabularies with similar or same meaning, they are unitized to representative one. Thereupon 20 vocabularies are finally selected as the formal vocabularies of 'spatial relationships', they are addition, subtraction, intersection, superimposition, juxtaposition, shifting, rotation, reflection, scaling, stretching, shear, bending, folding, distortion, articulation, deconstruction, symmetry, repetition, proportion, and asymmetry.

Bond Graph Modeling and Control for an Automatic Transmission (자동변속기의 본드선도 모델링 및 제어)

  • 강민수;강조웅;김종식
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.425-430
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    • 2002
  • An automatic transmission model using the bond graph techniques is developed for analyzing shift characteristics of vehicles. Bond graph models can be systemically manipulated to yield state space equations of standard form. Bond graph techniques are applied for modeling overall automatic transmission systems and shift models. A fuzzy controller is synthesized for the verification of a shifting model in the ${1^st} gear to the {2^nd}$ gear. Simulation results show the fitness of models by the bond graph techniques.

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