• Journal of Korean Library and Information Science Society
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• v.40 no.1
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• pp.493-516
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• 2009

The study is to suggest the roles of school library professionals upon changes of school libraries according to the 7th Korean Educational Curriculum. With this purpose, it investigates the policies and current status of allocations of school library professionals, and the interview of non-regular librarian about works. The study also compares job understanding of teacher-librarians, teachers managing school libraries and that of non-regular librarians in school libraries. It suggested the desirable roles of school library professionals.

• Progress in Medical Physics
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• v.24 no.4
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• pp.303-314
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• 2013

Image quality of computed tomography (CT) is very vulnerable to metal artifacts. Recently, the thickness and background normalization techniques have been introduced. Since they provide flat sinograms, it is easy to determine metal traces and a simple linear interpolation would be enough to describe the missing data in sinograms. In this study, we have developed a theory describing two normalization methods and compared two methods with respect to various sizes and numbers of metal inserts by using simple numerical simulations. The developed theory showed that the background normalization provide flatter sinograms than the thickness normalization, which was validated with the simulation results. Numerical simulation results with respect to various sizes and numbers of metal inserts showed that the background normalization was better than the thickness normalization for metal artifact corrections. Although the residual artifacts still existed, we have showed that the background normalization without the segmentation procedure was better than the thickness normalization for metal artifact corrections. Since the background normalization without the segmentation procedure is simple and it does not require any users' intervention, it can be readily installed in conventional CT systems.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38C no.4
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• pp.365-370
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• 2013

In this paper, we propose robust blind estimators for the frequency offset of orthogonal frequency division multiplexing in non-Gaussian noise environments. We first propose a maximum likelihood (ML) estimator in non-Gaussian noise modeled as a complex isotropic Cauchy process, and then, a simpler estimator based on the ML estimator is proposed. From numerical results, we confirm that the proposed estimators are robust to the non-Gaussian noise and have a better estimation performance over the conventional estimator in non-Gaussian noise environments.

• Korean Journal of Labor Studies
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• v.17 no.1
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• pp.139-176
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• 2011

Non-regular workers came to the fore while working class formation was in retreat along with the democratic labor movement of regular workers. The formation of principal agents, however, is yet to occur. Then, why non-regular workers' struggles could not yield a consequence in that regard? What kind of factors are to determine the outcome of the struggles and how do they do it? It is the aim of this study to answer those questions. In contrast with regular workers' struggles, non-regular workers' struggles tend to break out in response to capitalist offensives, rely on atypical and, often, extreme measures of struggle rather than strike in the form of work stoppage, drag out for too long, and appeal for social solidarity outside when the solidarity of regular workers is not available. Non-regular workers' struggles tend to end up with failure rather than success, and with weakening rather than strengthening of their organizational strength. So as to overcome the tendency to fail, non-regular workers' struggles need regular workers' solidarity in addition to their own strong mobilization power, while social solidarity or positional power could substitute for regular workers' solidarity in some cases. So as to build up their organizational strength, non-regular workers' struggles should win victories in the struggles, while a victory could turn into a trap in the case of conversion. Both regular workers' solidarity and the internal integration of the struggles are two foremost important factors in achieving the victory of struggles and the building-up of organizational strength. Those who have got involved in struggles are from the best organized sector among all the non-regular workers. As they have gone through weakening of organizational strength, it becomes more difficult for non-regular workers to form principal agents. Without non-regular workers' struggles, however, the capitalist offensives must have carried the day. In that sense, non-regular workers' struggles did a role in at least detaining capitalist offensives, if not stopping them. The practical implication of non-regular workers' struggles is that, if non-regular workers redefine the ultimate goal of their struggles as the formation of their principal agents for working class formation, it would be a strategically rational choice to identify the strategic objective of struggles with the maintaining and strengthening of their organizational strength rather than the achievement of their immediate demands.

• Proceedings of the Korean Statistical Society Conference
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• 2005.05a
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• pp.277-283
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• 2005

In general, stock prices do not follow normal distributions and mean trend indexes, volatility indexes, and volume indicators relating to these non-normal stock price are widely used as buy-sell strategies. These general buy-sell strategies are rather intuitive than statistical reasoning. The non-normality problem can be solved by normalizing process and statistical buy-sell strategy can be obtained by using mean trend and volatility indexes together with normalized stock prices. In this paper, buy-sell strategy based on mean trend and volatility index with normalized stock prices are proposed and applied to KOSPI200 data to see the feasibility of the proposed buy-sell strategy.

• The Optical Journal
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• s.129
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• pp.40-42
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• 2010

광학교육에 있어서 정규교육은 대학교에서 장기적인 계획을 수립하여 21세기 수요에 적합한 인재를 길러내는 역할을 수행한다면, 비정규교육은 주로 단기과정으로 개설된다. 국내의 경우는 인하대학교 광기술 교육센터와 전남대학교의 광기술인력교육센터에서 단기 교육과정을 개설하고 있으며, 최근 몇 년 사이에 개설강좌가 많이 늘어나서 광기술 교육수요에 적극적으로 대처하고 있다. 단기교육은 최신기술의 흐름을 파악하고 오프라인 교육과 온라인 교육이 병행되어야 한다. 그래서 지속적인 관심으로 광학교육을 발전시켜 나가야 한다.

• Korean Journal of Legislative Studies
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• v.24 no.3
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• pp.85-111
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• 2018

This study examines the puzzle of institutional change of irregular worker protection system in Korea through a theory of incremental institutional change. It is the case of "conversion" mode of institutional change that occurs when ambiguous rules permit reinterpretations of rules and regulations for converting functions of institutions into new ones without formal revision. Management sectors with enforcement power have circumvented main rules of high discretion since 2007. In institutional dimension, the extent of irregular workers and the provisions of limit on employment-period and prohibition-correction on discrimination lack sufficient details. In political context, veto possibilities have been downward. Irregular workers were hardly organized independently and two labor union federations mainly composed of regular workers were less receptive to them. Veto possibilities in legislation were also low: the Economic and Social Development Commission ended up in weak labor representation and labor parties in the National Assembly have undergone dissolution.

• Journal of Labour Economics
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• v.24 no.1
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• pp.177-205
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• 2001

This study investigates a long-tenn effect of labor career during middle life on the retirement process and income status later in life course. Two waves of KLIPS (Korean Labor Longitudinal Panel Survey) data sets collected in 1998 and 1999, are employed, which include detailed information on economic activities among those aged 15 and over. Results show that temporary, contracted workers during middle life not only have higher risk of job loss and poverty than those in permanent work status but also they are more likely to experience a stressful retirement process later in life course.

• Journal of the Society of Naval Architects of Korea
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• v.55 no.6
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• pp.466-473
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• 2018

Most frequency domain-based approaches assume that structural response should be a Gaussian random process. But a lot of non-Gaussian processes caused by multi-excitation and non-linearity in structural responses or load itself are observed in many real engineering problems. In this study, the effect of non-Normality on fatigue damages are discussed through case study. The accuracy of four frequency domain methods for non-Gaussian processes are compared in the case study. Power-law and Hermite models which are derived for non-Gaussian narrow-banded process tend to estimate fatigue damages less accurate than time domain results in small kurtosis and in case of large kurtosis they give conservative results. Weibull model seems to give conservative results in all environmental conditions considered. Among the four methods, Benascuitti-Tovo model for non-Gaussian process gives the best results in case study. This study could serve as background material for understanding the effect of non-normality on fatigue damages.

• The Journal of the Korea Contents Association
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• v.10 no.4
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• pp.386-396
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• 2010

The purpose of this study is to examine the non-regular labor dispute from beginning to the ends, thus, give guidance for future similar labor disputes. As a result of this study, firstly, subcontract company union negotiated with their companies, but after their companies was shut up, the union demanded negotiation with Hynix Co.(Hynix Co. contracted with union member's companies about cleaning job etc for every year). However, Hynix rejected the union's demand, because Hynix Co. do not have the legal obligation to negotiate with subcontract company union. Secondly, union members was to in unemployment and for the employment & negotiation with Hynix Co. they did illegal actions against Hynix Co. Thirdly, there was tried many efforts by NGO & government authorities etc to settle the disputes, and mediated, arbitrated by private expert(Certified Public Labor Attorney) Finally, both parties(that is Hynix Co. and subcontract company union) negotiated each other and settled the dispute without employment.