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- 저자 : ( Haneol Lee ) (검색결과 75 건)
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Lee Haneol 인하대학교 국제관계연구소 2021 Pacific Focus Vol.36 No.1
This article explores alliance effectiveness with a particular focus on peacetime capability‐building activities. Questioning why an alliance succeeds in an effective capability‐building activity sometimes but not others, this article argues that the key to effectiveness rests on the civil‐military relations of the smaller ally. The military effectiveness of capability‐building activities increases if the preferences of civilian and military leaders of the smaller ally are converged. Furthermore, constructive civil‐military coordination positively impacts military effectiveness. This article tests these propositions with the FX‐III project, which is regarded as the largest fighter jet procurement project of the Republic of Korea (ROK). The military effectiveness of the project declined across two phases, which is attributable primarily to unproductive coordination between civilian and military leaders in phase two. This case study reveals that the impact of preference alignment does not influence military effectiveness as broadly as does civil‐military coordination.
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Lee, Haneol,Deshmukh, P.R.,Kim, Jong Hun,Hyun, Hyung Soo,Sohn, Youngku,Shin, Weon Gyu Elsevier 2019 JOURNAL OF ALLOYS AND COMPOUNDS Vol.810 No.-
<P><B>Abstract</B></P> <P>In the present study, metal oxide (TiO<SUB>2</SUB> or SnO<SUB>2</SUB>) nanoparticles were coated on boron particles using a facile spray drying technique. The coating of metal oxide nanoparticles on the boron surface was varied by changing the weight ratio of metal oxide nanoparticles to boron particles. The crystalline structure of the metal oxide nanoparticles was mainly retained without any additional phase formation on the metal oxide coated boron particles, as identified by XRD. FIB-SEM images showed that the TiO<SUB>2</SUB> or SnO<SUB>2</SUB> coated boron particles formed microspheres with diameters between 5 and 10 μm. FIB-cross sectional images indicated the microspheres had a porous structure, and every individual boron particle was coated by metal oxide nanoparticles. The line scanning profile, elemental mapping and corresponding EDAX spectra results indicated the boron particles were well coated with metal oxide nanoparticles, and confirmed the presence of respective elements in the samples, respectively. TEM study showed the fine coating of metal oxide nanoparticles on the surface of the boron particles. The surface elemental composition was identified with XPS, and revealed the strong interaction between the metal oxide and boron particles. The thermal behavior of the boron, metal oxide and metal oxide nanoparticle coated boron particles was studied in the presence of nitrogen and air atmosphere using thermogravimetric analysis. The TGA of the metal oxide nanoparticle coated boron particles showed enhanced oxidation-resistance performance in the presence of air atmosphere.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Metal oxide nanoparticle coating on boron particles using spray-drying technique. </LI> <LI> Porous microspheres of metal oxide nanoparticle coated boron particles. </LI> <LI> Well distribution and coating of metal oxide nanoparticles on the boron particles. </LI> <LI> Enhanced oxidation-resistance performance of metal oxide coated boron particles. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Lee, Haneol,Park, Chan Jong Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.6
As the IAEA has applied integrated safeguards and a state level approach to member states, the importance of national inspection has increased. However, the requirements for national inspection for some member states are different from the IAEA safeguards. In particular, the national inspection for the ROK requires on-site U concentration analysis due to a domestic notification. This research proposes an on-site U concentration analysis (OUCA) method for UO<sub>2</sub> pellets using gamma spectroscopy to satisfy the domestic notification requirement. The OUCA method calculates the U concentration of UO<sub>2</sub> pellets using the measured net X-ray counts and declared <sup>235</sup>U enrichment. This research demonstrates the feasibility of the OUCA method using both MCNP simulation and experiment. It simulated and measured the net X-ray counts of different UO<sub>2</sub> pellets with different U concentrations and <sup>235</sup>U enrichments. The simulated and measured net X-ray counts were fitted to polynomials as a function of U concentration and <sup>235</sup>U enrichment. The goodness-of-fit results of both simulation and experiment demonstrated the feasibility of the OUCA method.
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Lee, Haneol,Yim, Man-Sung Elsevier 2017 Progress in nuclear energy Vol.94 No.-
<P><B>Abstract</B></P> <P>Using computational models, this research examined electricity generation from spent nuclear fuel and its possible uses. The proposed approach was based on converting gamma radiation energy into electricity using scintillators and photovoltaic cells. The work includes performing gamma radiation environment analysis around spent fuel, scintillated photon analysis, and photovoltaic cell analysis for electricity generation. The OrigenArp code was used for gamma radiation environment analysis and the MCNPX 2.7.0 code was used for analyzing scintillation process. For the scintillated photon analysis and photovoltaic cell analysis, a new simulation model was developed and validated based on comparison with experimental data. The effect of self-absorption and radiation damage within the scintillator was described by using experimental data. Based on using 14 energy conversion system units in a spent fuel storage pool in a PWR with CdWO<SUB>4</SUB> as scintillator and SiO2 as photovoltaic cell, generation of electric energy was estimated to range between a few hundred watts and a few watts depending on the cooling time. The estimated amount of electric power generation from spent fuel energy conversion was not enough for large scale applications. But the converted electric power could be utilized as emergency power source in an operating nuclear power plant for various detection and monitoring purposes and for the support of spent fuel pool cooling pump operations.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The feasibility on radiation conversion into electricity using scintillator photovoltaic cell was demonstrated. </LI> <LI> The generated electricity inside a spent fuel storage pool was calculated using computational models. </LI> <LI> The computational model used considered photon self-absorption and radiation damage in a scintillator. </LI> <LI> The computational model used was validated using a lab-scale experiment and was found to be reasonably accurate. </LI> <LI> The generated electricity could be utilized for small-scale applications such as for spent fuel safeguards. </LI> </UL> </P>
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이한얼(Haneol Lee),오남수(Namsoo Oh),로드리그 휴고(Hugo Rodrigue) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
In this study, an inflatable gripper made with plastic films based on pouch motors is introduced. Pouch motor is an actuator which makes contraction in the longitudinal direction while expanding in the lateral direction when pressure is applied to the pouch. If the length of both ends of the pouch motor is limited to less than total length, overlap occurs between two inflated pouches makes forces outwards. And if this of one side is limited, pouches of unfixed side cannot maintain the overlap, so it can make bending angles. The gripper consists of two pouch motors based on this principle. First chamber makes bending motion by inflating. Second chamber is constrained to the unfixed side of the first chamber. It prevents the first chamber being released by the load and makes forces higher. Single actuator made with PE tubes with a width of 50 mm and a thickness of 0.05 mm can bends about 360 degrees and sustains over 1 kg loads at 10 kPa. Bending angles and forces of the gripper at the same pressure can be varied by changing the length of constraint or size of pouches.
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이한얼(Haneol Lee),김휘강(Huy Kang Kim) 한국정보보호학회 2021 정보보호학회논문지 Vol.31 No.4
커널을 변조하는 루트킷과 같은 악성코드가 만약 메모리 분석을 회피하기 위한 메커니즘을 추가하게 될 경우, 분석이 어려워지거나 불가능하게 되면서 분석가의 판단에 악영향을 미칠 수 있다. 따라서 향후 고도화된 커널 변조를 통해 탐지를 우회하는 루트킷과 같은 악성코드에 선제적으로 대응하고자 한다. 이를 위해 공격자의 관점에서 윈도우 커널에서 사용되는 주요 구조체를 분석하고, 커널 객체를 변조할 수 있는 방법을 적용하여 메모리 덤프 파일에 변조를 진행하였다. 변조 결과 널리 사용되는 메모리 분석 도구에서 탐지가 되지 않는 것을 실험을 통해 확인하였다. 이후 분석가의 관점에서 변조 저항성의 개념을 사용하여 변조를 탐지할 수 있는 소프트웨어 형태로 만들어 기존 메모리 분석 도구에서 탐지되지 않는 영역에 대해 탐지 가능함을 보인다. 본 연구를 통해 선제적으로 커널 영역에 대해 변조를 시도하고 정밀 분석이 가능하도록 인사이트를 도출하였다는 데 의의가 있다 판단된다. 하지만 정밀 분석을 위한 소프트웨어 구현에 있어 필요한 탐지 규칙을 수동으로 생성해야 한다는 한계점이 존재한다. Malware, such as a rootkit that modifies the kernel, can adversely affect the analyst’s judgment, making the analysis difficult or impossible if a mechanism to evade memory analysis is added. Therefore, we plan to preemptively respond to malware such as rootkits that bypass detection through advanced kernel modulation in the future. To this end, the main structure used in the Windows kernel was analyzed from the attacker’s point of view, and a method capable of modulating the kernel object was applied to modulate the memory dump file. The result of tampering is confirmed through experimentation that it cannot be detected by memory analysis tool widely used worldwide. Then, from the analyst’s point of view, using the concept of tamper resistance, it is made in the form of software that can detect tampering and shows that it is possible to detect areas that are not detected by existing memory analysis tools. Through this study, it is judged that it is meaningful in that it preemptively attempted to modulate the kernel area and derived insights to enable precise analysis. However, there is a limitation in that the necessary detection rules need to be manually created in software implementation for precise analysis.
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Cho, Haneol,Son, Hyunsu,Kim, Donghun,Lee, Minho,Boateng, Samuel,Han, HyukSu,Kim, Kang Min,Kim, Seungchul,Choi, Heechae,Song, Taeseup,Lee, Kyu Hwan American Chemical Society 2017 The Journal of Physical Chemistry Part C Vol.121 No.28
<P>Li4Ti5O12 (LTO) has attracted tremendous attention as a stationary Li-ion battery anode material due to its excellent stability. However, the poor rate capability caused by the low electrical conductivity limits its practical use. Previously, Mg-doping in LTO has been used to improve the electrical conductivity and electrochemical properties, but the Mg-doped LTO system generally exhibits large anomalies in the electrical properties and capacities, which limits the reliable mass-production of engineered LTO. In this study, on the basis of first-principles calculations and related experiments, we systematically study the effects of charge-compensating point defects of the Mg-doped LTO on the electrical properties. A combination of first-principles calculations with thermodynamic modeling shows that high-temperature annealing under reducing conditions could effectively alter the Mg-doping site from a Ti4+ to Li+ site and increase the electrical conductivity significantly due to reduced electron effective mass and increased carrier concentration. Mg-doped LTO annealed under reducing condition exhibits a significantly improved rate compared capability with that of LTO annealed under air condition. The theoretical-analysis-associated experimental results provide more general design guidelines for the preparation of doped LTO with the promise of further improvements in performance.</P>
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