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On the Characteristic and Analysis of FCSR Sequences for Linear Complexity (선형복잡도 측면에서 FCSR의 이론절인 특성 및 분석 연구)

  • Seo Chang-Ho;Kim Seok-Woo
    • Journal of KIISE:Computer Systems and Theory
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    • v.32 no.10
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    • pp.507-511
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    • 2005
  • We have derived the linear complexity of a binary sequence generated by a Feedback with Carry Shift Regiater(FCSR) under the following condition: q is a power of a prime such that $q=r^e,\;(e{\geq}2)$ and r=2p+1, where both r and p are 2-prime. Also, a summation generator creates sequence from addition with carry of LFSR(Linear Feedback Shift Register) sequences. Similarly, it is possible to generate keystream by bitwise exclusive-oring on two FCSR sequences. In this paper, we described the cryptographic properties of a sequence generated by the FCSRs in view of the linear complexity.

A Study on the Parking Demand of Public Sized Apartments - Focused on Apartments at Chil-Gok Area in Daegu - (국민주택규모 아파트단지의 주차수요에 관한 연구 - 대구광역시 칠곡지구를 중심으로 -)

  • 박찬돈;박몽섭;하재명
    • Journal of the Korean housing association
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    • v.14 no.6
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    • pp.41-50
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    • 2003
  • The parking problem is caused by the parking demand. The ratio of parking demand at multi-family housing sites has been increased significantly, therefore several parking problems have occurred. The goal of this study is to investigate the parking demand per housing size of public-sized apartments, and to prepare that with the architectural regulations about parking supply. According to the results of this study, the parking demand of the small size housing unit(exclusive size:60 $m^2$ below) shows 1.09 car per the unit. and that of the medium size housing unit(exclusive size:60 $m^2$ over 85 $m^2$ below) shows 1.34 car per the unit. The parking demand of the small size housing unit was exceeded 56% more than the legal supply limit, and the parking demand of the medium size housing unit was exceeded 34% more. It is means that the level of architectural regulation about parking supply was not enough than the parking demand. So, it needs recon-sideration about the architectural regulations of parking supply.

A Study on Management of Foreign Seamen on Board Coastal & Offshore Fishing Boats (연근해어선에 승무하는 외국인 어선원의 관리방안)

  • Cha, Cheol-Pyo;Park, Jong-Un
    • Journal of Fisheries and Marine Sciences Education
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    • v.23 no.3
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    • pp.515-525
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    • 2011
  • Due to changes in internal and external environment of coastal & offshore fishery such as decrease in coastal & offshore fishery resources, rising labor costs, rising gas prices, rising turnover rate of seamen, and intensified avoiding 4D types of business, the domestic seamen's avoidance of going to sea is being intensified. In order to solve the problems of domestic seamen shortage, coastal & offshore fishery businesses prefer to employ foreign seamen whose wages are relatively low, so employment of foreign seamen continues to increase. However, the foreign seamen system has the problems in selecting and managing seamen but these problems have been not adequately dealt with, so damages to fishery business continue to occur due to the seamen's deserting. The cases, in which foreigners who entered the country to take the sea in coastal & offshore fishing boats deserted their workplace, recorded 36.4% as of 2010. So in order to achieve the purpose of the foreign seamen system itself through rational management of foreign seamen, the exclusive organization to manage foreign seamen should be established and the system to rationally select foreign seamen who have experiences of fishery should be established. The utilization of foreign seamen during off season needs to be maximized by establishing the employment connection system for the management of foreign seamen and employment stabilization, and the exclusive organization for education of foreign seamen and the organization for nurturing domestic seamen need to be established and operated.

Segmentation of Moving Multiple Vehicles using Logic Operations (논리연산을 이용한 주행차량 영상분할)

  • Choi Kiho
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.1 no.1
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    • pp.10-16
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    • 2002
  • In this paper, a novel algorithm for segmentation of moving multiple vehicles in video sequences using logic operations is proposed. For the case of multiple vehicles in a scene, the proposed algorithm begins with a robust double-edge image derived from the difference between two successive frames using exclusive OR operation. After extracting only the edges of moving multiple vehicles using Laplacian filter, AND operation and dilation operation, the image is segmented into moving multiple vehicle image. The features of moving vehicles can be directly extracted from the segmented images. The proposed algorithm has no the two preprocessing steps, so it can reduce noises which are norm at in preprocessing of the original images. The algorithm is more simplified using logic operations. The proposed algorithm is evaluated on an outdoor video sequence with moving multiple vehicles in 90,000 frames of 30fps by a low-end video camera and produces promising results.

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Effects of Self-breast Pumping in Primiparous Women after Cesarean Delivery (제왕절개술 초산모의 자가 착유 행위 효과)

  • Yeo, Jung-Hee;Moon, Guil-Nam;Lee, Sun-Ok
    • Women's Health Nursing
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    • v.18 no.2
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    • pp.98-107
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    • 2012
  • Purpose: This study was done to identify the effects of self-breast pumping on breastfeeding rates and, the degree of breast milk fullness among primiparous women giving birth by cesarean section. Methods: The study design was a non-synchronized posttest control group experiment with repeated measures. The participants were 60 women, 31 in the experimental group who used a manual pump 5 times a day after exclusive breastfeeding and 29 in the control group who breastfed exclusively with no other interventions. Results: While self-breast pumping did not improve breastfeeding rates or the degree of breast milk fullness at any of the time points studied, breastfeeding rates continued to remain high till 12 weeks postpartum in both groups. Conclusion: Although some modifications in research methods will be required to identify the effects of breast pumping and exclusive breastfeeding, both these approaches can be used as interventions to improve breastfeeding rates and breast milk quantity.

Firms Collaboration in the E-Business Environment A System Dynamics Simulation

  • Kim, Bowon
    • Proceedings of the Korea Society for Simulation Conference
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    • 2001.05a
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    • pp.163-163
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    • 2001
  • The primary research questions in this paper are why and how competing firms collaborate, not compete, in the virtual marketplace, e.g., B2B marketplace in the Internet environment. In order to answer the questions, we take on a system dynamics simulation approach: we consider two broad e-collaboration strategies: · Exclusive e-business strategy If the firm adopts this strategy, it allocates all of its resources (available for e-business development) to its own e-business capability building only. · Collaborative e-business strategy When the firm adopts a collaborative e-business strategy, it invests not only in its own, but also the industrys e-business capability building. From the system dynamics simulation results, we conclude that e-collaboration pays off in the long run: although it is hard to tell whether the collaborative strategy is better than the exclusive one during the initial period, it is unambiguous that the collaborative e-business strategy Performs much better in the long run. We infer that such collaboration could occur when the firms realize that they benefit from the expansion of the market demand due to their collaboration. That is, in order for such collaboration between competing firms to be sustainable, such collaboration should create more demand in the market so that each company could earn more profit even if it gets less in terms of market share.

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Fast Multi-Rate LDPC Encoder Architecture for WiBro System (WiBro 시스템을 위한 고속 LDPC 인코더 설계)

  • Kim, Jeong-Ki;S.P., Balakannan;Lee, Moon-Ho
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.45 no.7
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    • pp.1-8
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    • 2008
  • Low Density Parity Check codes(LDPC) are recently focused on communication systems due to its good performance. The standard of WiBro has also included LDPC codes as a channel coding. The weak point of implementation for LDPC encoder is that conventional binary Matrix Vector Multiplier has many clock cycles which limit throughput. In this paper, we propose semi-parallel architecture by using cyclic shift registers and exclusive-OR without conventional Matrix Vector Multipliers over the standard parity check matrices with Circulant Permutation Matrices(CPM). Furthermore, multi-rate encoder is designed by using proposed architecture. Our encoder with multi-rate for IEEE 802.16e LDPC has lower clock cycles and higher throughput.

A Study on Space Program of Korean Floating Marina Clubhouse

  • Pak, Sung-Sine
    • Journal of Navigation and Port Research
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    • v.36 no.7
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    • pp.545-552
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    • 2012
  • Domestic marina facilities today consist mostly of composite-type marinas with particular spatial composition characteristics, due to the regulatory restrictions that keep their development in the public sector and the tepid growth of marine leisure-sports. To develop a marina club design appropriate for domestic conditions, this study establishes space program standards for designing Korean marinas based on a case analysis of existing marina clubs and a survey of floating marina clubs. It is possible for a current composite-type Korean marina club to have a spatial composition of 16~18% for marina-exclusive facility (mFA), 47~49% for commercial facility (cFA), 27~30% for public space (pFA) and 5~8% for management space (emFA). With this composition as a basis, space program estimation of a Korean marina club can be done through the process of estimating in order the marina-exclusive facility area, the floor area by each space and the total floor area, the first floor area, the deck area and the pontoon area. Since the space program established in this study can be utilized as a tool for designing a Korean marina club, it is expected to be helpful in designing marina clubs in the future.

Are Online and Offline Delinquency Mutually Exclusive? Blurred Boundaries between Cyber Space and the Real-World

  • Ko, Nayoung;Hong, Myeonggi;Hwang, Jeeseon;Chang, Jeonghyeon;Hwang, EuiGab
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.15 no.8
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    • pp.3048-3067
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    • 2021
  • This study examines the similarities and differences between the causes of juvenile delinquency in online and offline environments and in personal characteristics. The study utilizes data from the '2014 Survey on Juvenile Victimization in Korea'. The population of this survey is students attending middle and high schools across the country. While this paper is based on the Self-Control theory, opportunity factors based on the Routine Activity theory and the Situational Action theory are also applied. Results show that the causes of offline delinquency are low self-control, routine activity and frequent gaming and SNS use. The causes of online delinquency are high self-control, existence of communication with unknown persons and the spectrum of personal information online. The common element of offline and online delinquency was the presence of delinquent peers. These results show that while online and offline delinquency cannot be explained with the same methodology, at the same time they are not mutually exclusive.

Paljak Roofs and Modern Joseon Architecture in North Korea: Selection and Exclusion (팔작지붕과 북한의 현대 조선식 건축: 선택과 배제)

  • Park, Dongmin
    • Journal of architectural history
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    • v.28 no.2
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    • pp.65-76
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    • 2019
  • Modern Joseon Architecture is North Korea's unique building style that interprets Korean traditional architecture in a modern way, and its most distinctive design feature is the Paljak roof that decorates the upper part of the buildings. This paper argues that continuous attempts at characterizing the nature of traditional Korean architecture in the late 1950s and early 1960s developed the theoretical rationale for the exclusive use of the Paljak roof in Modern Joseon Architecture. It also argues that the construction of the Pyongyang Grand Theater and the Okryu Restaurant during this period became a decisive moment for the formalization of the Paljak roof. The double roof rafters and gables and the "cheerful yet solemn" roofline were considered as main characteristic features of the Korean roof and the Paljak roof perfectly fits this description. Particularly, in North Korean society where Kim Il Sung became idolized as an impersonalized deity, an anecdote in which Kim Il Sung fixed a prominent gabled roof in the Pyongyang Grand Theater into a Paljak roof has allowed for the roof to gain an exclusive status. Hence, almost all Modern Joseon Architecture since the 1960s accepted the Paljak roof's monopoly position, rather than experimenting with other traditional roof types.