• Journal of the Korea Institute of Information Security & Cryptology
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• v.28 no.6
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• pp.1553-1561
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• 2018

The source code for Android is open and easy to modify depending on the purpose. Recently, this charateristic has been exploited to bypass the runtime protection technique and extract the original executable code. Unfortunately, Android devices are so fragmented that it is difficult to verify the integrity of the system. To solve this problem, this paper proposes a technique to verify the integrity of the execution environment indirectly using the features of the application permission. Before executing the original executable code, it loads and executes the dummy DEX file to monitor for abnormal events and determine whether the system is intact. The proposed technique shows a performance overhead of about 2 seconds and shows that it can detect the bypassing technique that is currently disclosed.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.17 no.1
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• pp.57-66
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• 2007

Scanning worms increase network traffic load because they randomly scan network addresses to find hosts that are susceptible to infection. Since propagation speed is faster than human reaction, scanning worms cause severe network congestion. So we need to build an early detection system which can automatically detect and quarantine such attacks. We propose algorithms to detect scanning worms using network traffic characteristics such as variance, variance to mean ratio(VMR) and correlation coefficient. The proposed algorithm have been verified by computer simulation. Compared to existing algorithm, the proposed algorithm not only reduced computational complexity but also improved detection accuracy.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• v.13 no.2
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• pp.199-203
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• 2010

Sigmoid volvulus may cause acute or subacute colonic obstruction. Excessive length of the sigmoid colon may be a contributing factor. Typically, the patient develops bilious vomiting and marked gaseous abdominal distension. We report a case of sigmoid volvulus in a 9-year-old boy who presented with recurrent, sudden onset abdominal pain, abdominal distension, and vomiting for 1 year, which was diagnosed by simple abdominal X-ray, barium enema, computed tomography, and colonoscopic examination. Colonoscopic reduction failed and a sigmoid colectomy with primary repair was performed. The intra-operative findings showed that the sigmoid colon was noted to be dilated, and redundant with a lax mesentery. Two clear areas of compression (proximal and distal) were present. After sigmoidectomy, the symptoms resolved. After 5 years of follow-up, he had no new symptoms.

• The Journal of the Korea institute of electronic communication sciences
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• v.6 no.6
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• pp.939-950
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• 2011

Eco-friendly development is inevitable for eradicating poverty in developing countries. In order to make Eco-friendly development a worldwide movement, we have to provide education for Eco-friendly development. There are, however, many problems in achieving education for Eco-friendly development. In conducting human education, there should be a certain philosophy as a foundation. The Earth charter, which people from various countries have developed since the World Summit on Eco-friendly Development and on which they have gained an international consensus, including consensus from NGOs, should serve as a foundation to conduct education for peace, human rights and environment. In this paper, I have discussed first the loss of Sustainability, second the loss of the view that human development is the basis for education, third the decline of literacy, fourth the decline of education for women, fifth excessive emphasis on knowledge and rote learning, and sixth the deviation from quality-of-life education.

• The Journal of the Korea institute of electronic communication sciences
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• v.9 no.12
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• pp.1397-1404
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• 2014

Grab cranes are used for multi-purpose when the sand and soil are deposited into harbor wharf or the undersea construction is performed. Among the components of crane grab, the wire drum and disc brake pad are key expendables and have disadvantages that lot of heat is generated and very expensive when replacing them. In this study, the thermal image analysis for the disc brake, which works with wire drum of the crane is suggested. The suggested system performs the pad thermal diagnosis through the thermal image using the characteristics that the disc and pad surface temperatures are distributed abnormally before the brake failure and the disc pad damage. Therefore, the damage by the failure can be prevented by discovering the abnormality of the machine parts before failure and the life cycle of the pad and the cost can be extended and saved by operating the crane performing constant checkup for the overload.

• Nuclear industry
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• v.35 no.9
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• pp.46-52
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• 2015

1975년 우라늄협회로 출발한 세계원자력협회(WNA)는 원자력을 평화적으로 이용하는 것을 적극 지원하고, 원자력 발전과 핵연료주기 전반에 걸친 원자력 산업 발전을 위하고자 설립한 세계적 민간 기구로, 우라늄 채광부터 변환, 농축, 핵연료 제조, 원자력발전 운영, 기자재(설비) 제작 및 사용후핵연료 처분에 이르기까지 원자력발전의 전 주기 산업을 촉진하고 관련 정보를 지원하고 있다. 2001년 지금의 명칭으로 변경한 WNA는 전 세계 원자력산업체와 원자력 관련 기관, 대학 등 175개 회원사를 두고 상호 협력과 전문 인력 교육 기반 강화, 국제화에 적극 나서고 있으며, 원자력산업 정보 제공과 교환을 위해 관련 보고서와 자료도 수시로 발행하고 있다. 2013년부터 WNA를 이끌고 있는 아그네타 라이징 사무총장은 지난 11월 영국 런던 소재 WNA를 방문한 <원자력신문>과의 인터뷰를 통해, 원전과 주변지역 주민의 갑상선암 발병에 대한 인과 관계에 대하여 "갑상선암 발병이 원전과 연관성 있다는 주장은 과학적 근거가 없다"고 단호히 말하고, "한국과 유사한 사례가 해외 원자력계(과학계)와 의학계에 보고된 적이 있냐"는 질문에 "해외에서 정상 운영되고 있는 원전 시설은 국제방사선방호위원회(ICRP)의 엄격한 기준(ICRP-60)이 적용하고 있으며, 방사선 방호와 관련된 연구보고서(논문)를 꾸준히 내고 있지만 원전 주변 주민에 대한 여러 역학 조사에서도 갑상선암이 증가했다는 사례는 보고된 바 없다"고 말했다. 또한 "실제로 일본 원폭 생존자 연구와 체르노빌 원전 주변 주민 연구에 의하면 20세 이상의 성인에서 방사선 노출에 의해 갑상선암이 증가한다는 증거는 없었다."면서 "체르노빌 사고와 후쿠시마 원전 사고 이후 방사선 누출로 인해 방사선이 갑상선암의 발생률을 증가시키는 것으로 알려졌지만 실제로 원전에서 발생하는 방사능은 갑상선암을 유발시킬 수 있는 양에 비해 아주 적다. 그럼에도 원전 시설에서 나오는 방사능 수치에 대해 제대로 밝히는 기관이 없기 때문에 원전 주변에 살아도 영향을 받는 것으로 오해할 수 있다."고 덧붙였다. 아그네타 라이징 사무총장은 스웨덴 출신의 방사선 방호 전문가로, 스웨덴 국영기업 Vattenfall AB 그룹에서 원자력 에너지 환경 분야 최고 전문가로 활동했으며, 스웨덴원자력학회, 유럽원자력학회, 세계여성원자력전문인회(WiN-Global) 회장 등을 역임했다. 인터뷰 전문을 게재한다.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.34 no.5
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• pp.499-504
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• 2010

It is important to determine the exact soot mass in a DPF system in order to control the timing of PM regeneration. The soot mass accumulated in a filter can be estimated from the pressure drop in the filter and the exhaust gas flow rates. In this study, the soot index is defined as the pressure drop in the DPF divided by the pressure drop in a DOC. An effective signal processing method for determining the soot index is proposed; the results yielded by this method indicate good correlation between the soot index and the amount of soot loaded into the filter for both steady-state and transient-state operating conditions in a 3L diesel engine for passenger vehicles.

• Korean Chemical Engineering Research
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• v.55 no.6
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• pp.861-867
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• 2017

In order to improve the capacity and cycling stability of Ni-rich NCA cathode materials for lithium ion batteries, the boron and cobalt were doped in commercial $Li_{1.06}Ni_{0.91}Co_{0.08}Al_{0.01}O_2$ (NCA) powders. Commercial NCA particles are mixed composites such as secondary particles of about $5{\mu}m$ and $12{\mu}m$, and the particle size was decreased by doping boron and cobalt. The initial discharge capacities of the boron and cobalt doped NCA-B and NCA-Co were found to be 214 mAh/g and 200 mAh/g, respectively, which are higher values than that of the raw NCA cathode material. In particular, NCA-Co exhibits the best discharge capacity of 157 mAh/g after 20 cycles, which is probably due to the enhanced diffusion of lithium ion by crystal growth along with the c-axis direction.

• Korean Journal of Medicinal Crop Science
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• v.16 no.2
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• pp.106-111
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• 2008

This study was carried out to elucidate the influence of gibberellin soak and seed dressing with Toros wp. on the dehiscence of Eleutherococcus senticossus seeds. $GA_3$ treatment was effective on promoting after-ripening seed of Eleutherococcus senticossus whose concentration was higher until $500\;mg{\cdot}L^{-1}$, after-ripening period became shorter. But rotting percentage increased gradually up above $500\; mg{\cdot}L^{-1}\;GA_3$After all, $300\;mg{\cdot}L^{-1}\;GA_3$ was the most effective treatment for promoting after-ripening seed. Dressing treatment with Toros wp. on seeds reduced the dehiscent rate of E. senticosius. by suppressing activity of fungi living on the endocarp surface of seed.

• Journal of the Korea Convergence Society
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• v.9 no.3
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• pp.131-135
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• 2018

The purpose of the present study was to examine the effects of full immersion virtual reality (VR) on the autonomic nervous system. The study was conducted with 17 men in their 20s. The subjects were given full immersion VR content, and electrocardiogram (ECG) signals were measured for five minutes before and after the application of the full immersion VR. The autonomic nervous system was evaluated by analyzing the LF, HF, TP, and LF/HF ratio of the ECG signal. The obtained data was analyzed by conducting a paired sample t-test. After applying full immersion VR, the subjects' HF and TP decreased significantly, while their LF/HF ratio increased significantly. According to the results of this study, Full immersion VR provided stress to the autonomic nervous system, but the changes were within the normal range of healthy adults. Therefore, full immersion VR can be safely applied to healthy adults.