Korean Association for Public Security Administration

Regulatory policies are indispensable to efficiently curbing anthropogenic CO2 emissions and sustainably producing emission-intensive goods. Though previous modelling practice has studied the cost and benefit of different regulatory policies, such as command-and-control (CAC) and emission trading scheme (ETS), little is known about that for overlapped emission regulation policies. Here, we built up a Data Envelopment Analysis model to study the losses and gains from the overlapped implementation of CAC and ETS for Korean coal-fired power plants during 2011–2015. We showed that the initial phase of CAC in 2012 caused a sudden loss in power plants’ output, but that the loss was gradually eliminated in 2013 and 2014. Upon promulgation in 2015, ETS is expected to increase only 0.990% of output compared to CAC, yet it largely failed to deliver the potential benefit in its first year. The overlapped implementation of CAC and ETS contributes to a small share (5.567%) of the unrealized benefit. Nonetheless, we showed that implementing CAC and ETS in parallel tends to disproportionately affect less efficient power plants by restricting their strategies to meet regulatory measures. Therefore, we suggest that the integration of CAC and ETS can be a transitory measure as ETS provides only marginal welfare benefits, but ETS must be fully adopted and strengthened in the near future to economically and equitably mitigate CO2 emissions.

Multiphoton interference effects can be measured with a single detector when two input photons are temporally well separated when compared with the dead time of the single-photon avalanche detector. Here we experimentally demonstrate that the Hong-Ou-Mandel interference effect can be observed with a single non-photon-number resolving detector via a time-delayed coincidence measurement of successive electrical signals from the detector. The two-photon interference experiment is performed by utilizing temporally well-separated pairwise weak coherent pulses, and the interference fringes are successfully measured with high visibility in the range of the limited upper bound for the weak coherent photon source.

Data deduplication is a technique that removes redundancy of data on the storage. For cloud storage services, enabling deduplication over encrypted data is of vital importance to achieve both cost savings and keeping data confidentiality simultaneously. Recently proposed solutions are not sufficient because of lacking desired level of security and efficiency. In this paper, we propose SEED, a novel scheme for serverless and efficient encrypted deduplication. Without aid of any additional servers, SEED provides strong confidentiality to the outsourced data. In addition, its non-interactive file encryption with support of lazy encryption greatly reduces latency in file uploading process. Security analysis and performance evaluations show the superior efficiency and effectiveness of SEED for cloud storage services.

During recent years, the role of information technology in shaping politics and social movements in the digital age is drawing increasing scholarly attention. There is, however, little such literature on North Korea as the country remains almost completely cut off from the Internet. Since the mid-1990s, the DPRK government has strategically developed its information and communication technology and has subsequently built a domestic intranet. Although North Korea keeps a minimal presence on the web, there are signs that the country is taking small and cautious steps to allow some social elites to take advantage of the Internet in order to leapfrog its economic development. Indeed, a high-profile defector indicated that North Korea will most likely start allowing wider but limited internet access in the near future. This paper examines North Korea's intranet and Internet policies and explores their political implications by drawing upon first-hand data from Korean sources and existing literature as well as by juxtaposing the North Korean case with other communist regimes such as China and Cuba in terms of their attempts to control and manipulate the Internet. It shows that the DPRK government is likely to learn from the Chinese and Cuban experiences and adopt a ‘Mosquito-Net’ model in controlling the Internet in an effort to attract foreign investment while keeping out information deemed threatening by the regime.

To overcome the viewing resolution limit defined by the Nyquist sampling theorem for a given lenslet pitch, a Moving Array-Lens Technique (MALT) was developed in 3-D integral imaging technique. Even though the MALT is an effective method for resolution improvement of Integral Imaging, this cannot be applied to a real-time 3-D integral imaging display system because of its mechanical movement. In this paper, we propose an integral imaging display using a computational pick-up method based on Intermediate-View Reconstruction Technique instead of optical moving pickup. We show that the proposed system can provide optically resolution-improved 3-D images of integral imaging by use of EIs generated by the IVRT through the optical experiments.

With the growth of the Internet, communication and network security have been the focus of much attention. In addition, deployment of resource intensive security protocols in battery-powered mobile devices has raised power consumption to a significant design basis of network design. In this paper, we propose a power-efficient secure communication restart mechanism for a wireless network and analyze the power consumed while restarting a secure communication. An experimental test bed was developed to inspect the proposed mechanism and to evaluate it in terms of power consumption relative to that of conventional secure communication restart mechanisms. Using our enhanced mechanism, we were able to reduce the power consumed during a secure communication restart by up to 60% compared with conventional restart mechanisms.

As computers supplied in a homes, offices, and Internet use increases, various service based on the Internet are developed. In the future, many devices such as wireless PDA, Internet telephone, TV, refrigerator and oven will be connected on the Internet and the Internet address exhaustion problem is gradually raised. The present IPv4 address exhaustion problem is being solved through NAT (network address translation) and the transition to next generation Internet is accelerated because of the advantages offered in various functions of mobility security service, QoS, as well as solutions for IPv4's address exhaustion. In IPv6, all hosts are designed to create and set their address automatically without the manager's intervention using the neighbor discovery protocol. When IPv6 host sets its address automatically, there are serious security vulnerabilities. To solve this security problem, many people have researched about a secure auto-configuration. In this paper, we analyze the security vulnerabilities in auto-configuration and provide security requirements for secure auto-configuration

While navigating, most autonomous mobile robots view things only in front of them and, as a result, they may collide with objects moving from the side or behind. To overcome this problem, an active omni-directional range sensor system is presented, that is capable of obtaining the omni-directional range data on a navigation environment through the use of a laser conic plane and a conic mirror. Based on this system configuration, we propose a self-localization algorithm. The proposed algorithm to estimate the current position and heading angle of mobile robots utilizes the registered range data obtained at two positions; current and previous and matches the two range informations. To show the effectiveness of the proposed algorithm, a series of simulations was conducted under various navigation conditions. The results show that the proposed algorithm is very efficient in processing, and can be effectively utilized for self-localization of mobile robots in unknown environments.