• 대한가정학회지
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• 제41권12호
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• pp.229-243
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• 2003

The purpose of this study is to understand North Korean female defectors' survival strategies in China. In this research, 13 female defectors in China were interviewed. There seemed to be 6 survival strategies in the interview. They disguised themselves as if they were Chosunjok；they tried to wear fashionable clothes, to mimic Chosunjok dialect, to speak mingling Chinese words with Korean words, and to get counterfeit ID cards. They suppressed themselves from showing their angers or resentment against Chinese who looked down on them due to their illegal status, but they would seek chances to revenge on them in the future. They have survived by gelling married to Chinese, but they were reluctant to have a baby because it was not for sure what their future lives are going to be like. They were alert against people around them all the time, especially against North Korean defectors, and were conscious of their competitive relationship among themselves. Finally, some of them appeared to seek routes to immigrate to South Korea, but others who didn't yet make up their minds to immigrate to South Korea had vague anticipations of North and South Koreas to be reunified.

• 융합보안논문지
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• 제16권3_1호
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• pp.107-114
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• 2016

북한은 그동안 핵을 고도화하고 미사일의 발사 거리를 늘려왔다. 북한이 대화를 통해 핵을 포기할 가능성은 이미 사라진 것으로 보인다. 김정은은 중국 특사가 미사일 발사를 말리기 위해 평양을 방문했는데도 비웃듯이 로켓을 쏘아 올렸다. 상황이 이런데도 대화로 문제를 해결할 수 있을 것인가. 한반도 비핵화의 유일한 길은 실효적인 대북제재를 통해 북한이 스스로 핵을 포기하도록 하는 것이다. 이를 위해 중국은 어떤 형태로든 역할을 해야 한다. 한국 내에서는 북한의 핵 미사일 위협에 대한 자위 차원에서 고고도미사일방어체계(사드)의 도입은 물론 핵무장 여론이 높아지고 있다. 이런 흐름은 중국의 전략적 이익에 부합하지 않을 것이다. 본 논문은 북한이 앞으로 어떤 행보를 해 나갈 것인가를 예측하기 위해서는 북한의 '군사정책'이 될 것이라는 가정 하에 김정은 체제의 군사정책 특징을 분석하고 전망하여 의미 있는 시사점을 찾고자 하는데 목적이 있다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권5호
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• pp.1912-1931
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• 2018

In future wireless network, user experience and energy efficiency will play more and more important roles in the communication systems compared to their roles at present. Quality of experience (QoE) and Energy Efficiency (EE) become the widely used metrics. In this paper, we study a combinatorial problem of QoE and EE and investigate a fair power allocation in heterogeneous networks. We first design a new metric, QoE-aware EE (QEE) to reflect the relationship of QoE and energy. Then, the concept of Utopia QEE is introduced, which is defined as the achievable maximum QEE in ideal conditions, for each user. Finally, we transform the power allocation process to an optimization of ratio of QEE and Utopia QEE and use invasive weed optimization (IWO) algorithm to solve the optimization problem. Numerical simulation results indicate that the proposed algorithm can get converged and efficiently improve the system energy efficiency and the QoE for each user.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권6호
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• pp.3165-3181
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• 2019

Spherical videos, which are also called 360-degree videos, have become increasingly popular due to the rapid development of virtual reality technology. However, the large amount of data in such videos is a huge challenge for existing transmission system. To use the existing encode framework, it should be converted into a 2D image plane by using a specific projection format, e.g. the equi-rectangular projection (ERP) format. The existing high-efficiency video coding standard (HEVC) can effectively compress video content, but its enormous computational complexity makes the time spent on compressing high-frame-rate and high-resolution 360-degree videos disproportionate to the benefits of compression. Focusing on the ERP format characteristics of 360-degree videos, this work develops a fast decision algorithm for predicting the coding unit depth interval and adaptive mode decision for intra prediction mode. The algorithm makes full use of the video characteristics of the ERP format by dealing with pole and equatorial areas separately. It sets different reference blocks and determination conditions according to the degree of stretching, which can reduce the coding time while ensuring the quality. Compared with the original reference software HM-16.16, the proposed algorithm can reduce time consumption by 39.3% in the all-intra configuration, and the BD-rate increases by only 0.84%.

• 융합보안논문지
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• 제18권2호
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• pp.89-99
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• 2018

2018년은 한반도 평화정착을 위한 중대한 전환점에 서있다. 금년 4~6월에 남한 미국-북한간 정상회담을 기점으로, 북한 핵과 미사일의 '완전하고, 검증가능하며, 불가역적인 폐기(CVID)'를 위한 험난한 여정이 시작되었다. 한국에 있어 '북핵의 CVID'만이 평화를 위한 최소한의 조건(하한선) 이지만, 북한+중국+러시아 등에게 '북핵의 CVID' 달성은 그들의 정치 군사적 위상을 크게 축소시킨다고 인식할 가능성이 크다. 따라서 남북-미북 정상 간에 북한 핵을 비핵화한다고 합의하더라고 그 실천과정에서 많은 난관이 예상된다. 중국에 있어서 북한의 존재는 단순히 국제적인 문제를 일으키는 하나의 국가가 아니라 정치적으로도 동북아에서 패권경쟁을 하는 미국과의 관계에서 매우 중요한 레버리지를 제공하는 전략적 가치가 있는 국가이다. 북한은 미국으로 하여금 중국에게 자꾸 뭔가를 부탁하지 않으면 안 되게 만드는 존재이다. 이에 급부상하고 있는 중국의 강압적인 패권행사를 거부하고, 비핵화 합의에 대한 이행과정에서의 불확실성을 해소하여 '북핵의 CVID'달성을 위한 차선의 대안으로써 '한일 안보협력'의 필요성을 제시하였다.

• Environmental Engineering Research
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• 제21권4호
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• pp.409-419
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• 2016

As a major energy consumption province, the issue about the carbon emissions in Hebei Province, China has been concerned by the government. The carbon emissions can be effectively reduced due to a more rational energy consumption structure. Thus, in this paper the constraint of low carbon emissions is considered as a foundation and four energies--coal, petroleum, natural gas and electricity including wind power, nuclear power and hydro-power etc are selected as the main analysis objects of the adjustment of energy structure. This paper takes energy cost minimum and carbon trading cost minimum as the objective functions based on the economic growth, energy saving and emission reduction targets and constructs an optimization model of energy consumption structure. And empirical research about energy consumption structure optimization in 2015 and 2020 is carried out based on the energy consumption data in Hebei Province, China during the period 1995-2013, which indicates that the energy consumption in Hebei dominated by coal cannot be replaced in the next seven years, from 2014 to 2020, when the coal consumption proportion is still up to 85.93%. Finally, the corresponding policy suggestions are put forward, according to the results of the energy structure optimization in Hebei Province.

• Journal of Electrical Engineering and Technology
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• 제10권4호
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• pp.1726-1733
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• 2015

In order to study the effect of the high-altitude and dusty weather in northwest of China on the corona characteristics of transmission lines, a corona caged based experimental system with sandy and dusty flow condition is numerically investigated and designed. This system overcomes the difficulties caused by harsh environment and offers easy usage for off-site tests. The design parameters are mainly determined by the characteristics of strong sandstorm in northwest region and test requirements. By the comparison of numerical simulation of the particle diffusion in four programs with rectangular or circular air-duct, a practical technology, which introduces swirl to control the particle diffusion length, is obtained. Accordingly, the structure of round air-duct with swirl elbow in inlet and outlet of high level segment is selected as final program. Systems of control and measurement are designed at the same time. Field tuning results show that the test system could ensure the range of sandy and dusty coverage. The wind speed, sandy and dusty concentration could be controlled and meet the requirements of accuracy. The experimental system has many features, such as simple structure, easy to be assembled, disassembled, transported and operated, small space occupied.

• 한국경제지리학회지
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• 제22권4호
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• pp.438-457
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• 2019

본 연구의 주요 목적은 북한 노동력의 대북 접경지역 진출 유형과 요인을 규명하고자 하는 것이다. 특히, 본 논문은 북한 노동력의 대북 접경지역 진출 경로 및 유형을 1) 대북 무역 상인과 북한 대방의 거래를 통한 진입과 2) 조선족 중개업체와 북한 대방의 거래를 통한 진입으로 구분하였으며, 대북 접경지역의 공간적 맥락에서 북한 노동력의 진출 요인을 분석하고자 했다. 우선 북한 노동력의 대북 접경지역 진입 경로 및 유형은 유엔 결의 2094호 이후 대북제재의 성격이 '촉구(call-upon)'에서 '의무화 및 강제화(decide)'로 전환되면서 크게 두 가지 측면에서 변화가 나타났다. 첫째, 중국 기업에게 북한 노동력을 파견할 수 있는 북한 대방과의 거래 주체가 대북 거래 상인에서 전문화된 조선족 중개업체로 전환되었다. 둘째, 중국으로 파견되는 북한 노동력의 성격이 '중화인민공화국입경출경관리법'과 '외국인재중국취업관리규정'에 따라 공식적인 취업 허가증과 취업 거류증을 취득한 공식 노동자에서 북·중 간 '무역비자협정'과 '국경 주민에 대한 통행증 제도'를 이용하거나 단기 방문 및 관광 비자를 취득하여 편법으로 대북 접경지역에 장기 체류하는 비공식 노동자(informal workers)로 전환되었다. 따라서 북한 노동자에 대한 실질적인 제재가 가해진 이후에 이러한 비공식 노동자들의 안정적인 체류와 관리 및 통제를 위한 전문적인 서비스에 대한 수요가 높아짐에 따라 대북 접경지역에 북한 노동자 중개업체가 활성화되고 있다. 이와 더불어 북한 노동력의 대북 접경지역 진입 요인은 세 가지 측면 - 1) 중국 사회보험제도의 개혁에 따른 실질 임금 상승, 2) 대북 접경지역의 취약한 노동시장 구조, 3) 안정적이고 관리 용이한 노동력 활용 -에서 분석했다.

• Environmental Engineering Research
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• 제21권4호
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• pp.355-364
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• 2016

Beijing, as a cradle of modern industry and the third largest metropolitan area in China, faces more responsibilities to adjust industrial structure and mitigate carbon emissions. The purpose of this study is aimed at predicting and comparing industrial carbon emissions of Beijing in ten scenarios under different policy focus, and then providing emission-cutting recommendations. In views of various scenarios issues, system dynamics has been applied to predict and simulate. To begin with, the model has been established following the step of causal loop diagram and stock flow diagram. This paper decomposes scenarios factors into energy structure, high energy consumption enterprises and growth rate of industrial output. The prediction and scenario simulation results shows that energy structure, carbon intensity and heavy energy consumption enterprises are key factors, and multiple factors has more significant impact on industrial carbon emissions. Hence, some recommendations about low-carbon mode of Beijing industrial carbon emission have been proposed according to simulation results.

• 환경영향평가
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• 제23권3호
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• pp.220-226
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• 2014

This study investigated temporal-spatial and variations in Geostationary Ocean Color Imager (GOCI) products of parameters total suspended solids (TSS) and chlorophyll-a in the North Marine Areas of East China Sea.GOCI data were collected daily from February 2012 to December 2012. The higher chlorophyll-a values were observed during the investigation period. The relatively large increase in TSS and chlorophyll-a at the sampling stations coupled with typhoon events during the summer rainy period. The abnormal chlorophyll-a concentration was mainly driven by meteorological factors such as typhoon and rainfall in the coastal areas of Jeju and the North Marine Areas of East China Sea. The abnormal high chlorophyll-a concentration at the majority of the coastal stations indicate eutrophication of coastal waters, especially Red tide. The events such as eutrophication and abnormal high chlorophyll-a concentration may potentially influence outbreak of Red Tide, detected with GOCI parameters.