• Journal of Radiation Protection and Research
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• v.34 no.3
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• pp.115-120
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• 2009

Since 1990s, some events - detection of a dirty bomb in a Russian nation park in 1995, 9/11 terrorist attack to WTC in 2001, discovery of Al-Qaeda's experimentation to build a dirty bomb in 2003 etc - have showed that nuclear or radiological terrorism relating to radioactive materials (hereinafter "radioactive materials" is referred to as "nuclear material, nuclear spent fuel and radioactive source") is not incredible but serious and credible threat. Thus, to respond to the new threat, the international community has not only strengthened security and physical protection of radioactive materials but also established prevention of and response to illicit trafficking of radioactive materials. In this regard, our government has enacted or revised the national regulatory framework with a view to improving security of radioactive materials and joined the international convention or agreement to meet this international trend. For the purpose of prevention of nuclear/radiological terrorism, this paper reviews physical characteristics of nuclear material and existing detection instruments used for prevention of illicit trafficking. Finally, national detection regime against nuclear/radiological terrorism based on paths of the smuggled radioactive materials to terrorist's target building/area, national topography and road networks, and defence-in-depth concept is suggested in this paper. This study should contribute to protect people's health, safety and environment from nuclear/radiological terrorism.

• Tuberculosis and Respiratory Diseases
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• v.46 no.1
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• pp.75-81
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• 1999

Background : Recently, there are many patients with lipoid pneumonia by ingestion of shark liver oil in Korea, but only a few animal experimentations have been carried out. The purpose of this study is to evaluate sequential change of the lung after aspiration of shark liver oil and to provide the radiologic-pathologic correlation. Methods: A single intratracheal administration of shark liver oil was given to 14 white rabbits. They were then sacrificed sequentially from 1 week to 6 weeks after injection. We investigated the HRCT and pathologic findings Results: One was sudden death immediately after injection. Six of the 13 rabbits showed pneumonic infiltrations on the HRCT. There were air space consolidation with air-bronchogram on the HRCT of the first week. They were associated with the volume loss in the 4th week, and the traction bronchiectasis in the 6th week. The important pathologic findings were peribronchial alveolar inflammation with septal widening and cuboidal metaplasia of the alveolar wall. The number of macrophages in an alveoli was peaked in the second week and then gradually decreased. On the 6th week, we could find the proliferation of fibroblasts. Conclusion: We can prove the development of lipoid pneumonia after aspiration of squalene by animal experimentation, and the understanding of HRCT and pathologic findings may be helpful in proper evaluation of pneumonia due to aspiration of fish-extracted lipid.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39B no.5
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• pp.309-316
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• 2014

It is easy to reverse engineer an Android app package file(APK) and get its decompiled source code. Therefore, attackers obtains economic benefits by illegally using the decompiled source code, or modifies an app by inserting malware. To address these problems in Android, we propose an APK overwrite scheme that protects apps against illegal modification of themselves by using a new anti-reverse engineering technique. In this paper, the targets are the apps which have been written by any programmer. For a target app (original app), server system (1) makes a copy of a target app, (2) encrypts the target app, (3) creates a stub app by replacing the DEX (Dalvik Executable) of the copied version with our stub DEX, and then (4) distributes the stub app as well as the encrypted target app to users of smartphones. The users downloads both the encrypted target app and the corresponding stub app. Whenever the stub app is executed on smartphones, the stub app and our launcher app decrypt the encrypted target app, overwrite the stub app with the decrypted target one, and executes the decrypted one. Every time the target app ends its execution, the decrypted app is deleted. To verify the feasibility of the proposed scheme, experimentation with several popular apps are carried out. The results of the experiment demonstrate that our scheme is effective for preventing reverse engineering and tampering of Android apps.

• Journal of the Korean Association of Geographic Information Studies
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• v.20 no.4
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• pp.24-38
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• 2017

The awareness and demand for technological elements in the field of cloud computing and their application models have increased. Cloud-based service information systems are being expanded for use in many applications. Advancements in information technology are directly related to spatial information. PaaS is an important platform for implementing a substantial cloud ecosystem to develop geo-based application services. For this reason, it is necessary to analyze the PaaS cloud technology prior to the development of SaaS. The PaaS cloud supports sharing of related extensions, database operations and management, and application development and deployment. The development of geo-spatial information systems or services based on PaaS in ranging the domestic and overseas range is in the initial stages of both research and application. In this study, state-of-the-art cloud computing is reviewed and a conceptual design for geo-based applications is presented. The proposed model is based on container methods, which are the core elements of PaaS cloud technology based on open source. It is thought that these technologies contribute to the applicability and scalability of the geo-spatial information industry that addresses cloud computing. It is expected that the results of this study will provide a technological base for practical service implementation and experimentation for geo-based applications.

• Journal of the Economic Geographical Society of Korea
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• v.19 no.2
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• pp.173-188
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• 2016

This paper argues that the establishment of the Kaohsiung Export Processing Zone (KEPZ), the first EPZ in East Asia, is a compromise of cold-war geopolitical economy in the 1960s. The KEPZ is part of the liberalization policy advise of the US Aid agency which intended to push the KMT (Kuomintang) government to downsize the nationalized sectors and foster private enterprises and encourage foreign investments. However, the KMT state hesitated to embrace the advice wholeheartedly but was forced to implement selectively the policies. To meet the compromise between liberalization and control, the KMT government takes advantage of the KEPZ to grab the geoeconomic opportunities emerging from the new international division of labor in the 1960s without losing the geopolitical support from the US. The idea that zoning as a space of compromise would provide a subtle re-examination of the rise of the KEPZ which is conventionally explained by the functionalist arguments such as increase of employment opportunities, foreign investments and export by the far-sighted developmental state.

• Journal of IKEEE
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• v.9 no.1 s.16
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• pp.19-30
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• 2005

Packet classification is defined as the action to match the packet with a set of predefined rules. One of classification is to use Ternary Content Addressable Memory hardware search engine that has faster than other algorithmic methods. However, TCAM has some limitations. One of them is that TCAM can not perform range matching efficiently. A range has to be expanded into prefixes to fit the boundary. In general, the number of expansion could be up to 2w-2, where w is the width of the field. For example, if two range fields with 16 bits are used, there could be up to $30\;{\times}\;30\;=\;900$ expansions for a single rule. In this paper, we describe the novel algorithm for converting range matching rules into TCAM entry efficiently. The number of maximum entry is 2w-4 when using the algorithm. Furthermore, it has also benefit about the negation range. In the result of experimentation, the new scheme practically reduces 14 percent in case that searched fields are source port and destination port number.

• Korean Journal of Plant Resources
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• v.18 no.2
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• pp.270-278
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• 2005

This experiment was conducted to develop and design a product that is convenient and helpful to both patients and ordinary people who want to maintain their health. In this experimentation, the experimental rat have been given with high fat food to induce Diabetes. Organic brown rice was given as their main energy source and natural complex food, most of materials were freeze-dried, was given to observe its effects on their glucose amount in the plasma. The results are as follows. During 28 days of basal diets, as observing their weight variations, normal group gained weights, but the natural complex food(NCF) groups lost their weights. As comparing the amount of neutral fat levels in the plasma between the diabetes group who just had basal group and one who had NCF, group with NCF groups' level was much lower than the other group who just had basal food. As comparing total cholesterol levels in the plasma, with diabetes group with basal food, $50\%$ and $100\%$ NCF groups' levels were lowered than that group. Regarding HDL-cholesterol level, all NCE groups had around 30mg/dl and there were not much fluctuation among groups. As for LDL-cholesterol level, the $100\%$ NCF group had the lowest level and showed almost the same as the normal group. The amounts of the glucose in the plasma were lowered in all NCF groups. Among those NCE groups, $100\%$ NCF group had 120mg/dl to reach almost the same as the normal group.

• Journal of the Korea Society of Computer and Information
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• v.16 no.3
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• pp.175-187
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• 2011

Since insects play important roles in existence of plants and other animals in the natural environment, they are considered as necessary biological resources from the perspectives of those biodiversity conservation and national utilization strategy. For the conservation and utilization of insect species, an observational learning environment is needed for non-experts such as citizens and students to take interest in insects in the natural ecosystem. The insect identification is a main factor for the observational learning. A current time-consuming search method by insect classification is inefficient because it needs much time for the non-experts who lack insect knowledge to identify insect species. To solve this problem, we proposed an smart phone-based insect identification inference system that helps the non-experts identify insect species from observational characteristics in the natural environment. This system is based on the similarity between the observational information by an observer and the biological insect characteristics. For this system, we classified the observational characteristics of insects into 27 elements according to order, family, and species, and proposed similarity indexes to search similar insects. In addition, we developed an insect identification inference prototype system to show this study's viability and performed comparison experimentation between our system and a general insect classification search method. As the results, we showed that our system is more effective in identifying insect species and it can be more efficient in search time.

• Korean Journal of Food Science and Technology
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• v.41 no.4
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• pp.417-422
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• 2009

The purpose of this study was to measure the changes in S-adenosyl-L-methionine (SAM) content and to find the best condition for SAM Kimchi during fermentation with the different kinds of raw materials of Kimchi and the diverse ways of making Kimchi. As fermentation was processing, pH of all Kimchi groups dramatically decreases at the beginning stage of experimentation. However, pH value was 4.2-4.3 in the last stage. Titratable acidity tends toward the similar results in pH value. At the first, the SAM content went down time substantially and then increases. Kimchi (A), which was made of the most basic raw materials, resulted in the lowest content of SAM. The most abundant SAM content of Kimchi was the Kimchi made with certain materials. Kimchi (I) had the most has SAM content, overall. The best time of fermentation was when pH was between 4.3 and 5.3, and titratable acidity was 0.5-1.0%. As the results of this study, the highest SAM content in Kimchi could be made when Kimchi was fermented for 9-12 days and titratable acidity showed 0.5-1.0% This study proved that the ratio of raw materials such as red pepper, fermented fished sauces, and other materials improved the levels of SAM in the Kimchi.

• The Korean Journal of Ecology
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• v.25 no.4
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• pp.253-259
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• 2002

Application of phytoremediation in the polluted area to remove undesirable materials is a complex and difficult subject without detailed investigation and experimentation. We investigated the accumulation patterns of cadmium and lead in plants naturally grown, the bioavailability of plants to accumulate these toxic metals and the responses of P. thunbergii to cadmium and lead. The soil samples contained detectable lead (＜$17.5_\mu$g/g), whereas cadmium was not detected in the soils of study area. The whole body of Persicaria thunbergii contained detectable lead (＜320.$8_\mu$g/g/g) but cadmium was detected only in the stem (＜7.$4_\mu$g/g/g) and root (＜10.$4_\mu$g/g/g) of P. thunbergii. Cadmium was not detected in Trapa japonica and Nymphoides peltata, whereas lead was detected in T. japonica (＜323.$7_\mu$g/g/g) and N. peltata (＜177.$5_\mu$g/g/g). Correlation coefficient between lead content in soil and in these plant samples represented positive correlation. The total content of lead in each plant sample increased in the order of N. peltata$\leq$P. thunbergii