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임재형(JaeHyung Lim),이승주(SeungJoo Lee),서영덕(Young-Duk Seo) 한국정보기술학회 2022 Proceedings of KIIT Conference Vol.2022 No.6
다양한 플랫폼 환경의 사용자가 늘어나면서 개인 추천시스템 이외에도 비슷한 소비 형태를 지닌 사용자들을 대상으로 하는 그룹 추천시스템의 필요성이 커지고 있다. 그룹을 만들기 위해 우선 사용자들의 특성을 분석해야 하므로, 본 논문에서는 행렬 분해 모델을 통해 사용자들을 나타낼 수 있는 저차원의 특성 벡터를 클러스터링 하였다. 이를 기반으로 성능 평가를 실시해 본 결과 그룹이 추천해준 아이템에 대하여 사용자들도 실제로 선호도가 높다는 것을 확인하였다. As the number of users of various platform environments increases, there is a growing need for a group recommender system targeting users with similar consumption patterns. We first analyze the characteristics of users to create a group. Then, we cluster low-dimensional characteristic vectors that can represent users through a matrix factorization models. As a result of comparative evaluations based on this, we verify that users actually have high preference for the items recommended by the group.
Microstructure Evolution and Mechanical Properties of Al/Al-Mg/Al composite sheet metals
Jaehyung Cho,Su-Hyeon Kim,Hyoung-Wook Kim,Cha-Yong Lim,Eun-Young Kim,Shi-Hoon Choi 한국소성가공학회 2011 기타자료 Vol.2011 No.8
Two different types of aluminum alloys of AA1050 and AA5182 were used to manufacture Al/Al-Mg/Al composite sheet metals by roll bonding technology at room temperature. The composite sheet metals were annealed at 400℃ and carried out uniaxial tension tests to investigate mechanical properties. Macroscopic mechanical properties are strongly dependent on the volume (or thickness) fraction of two component layers. Microstructure and texture evolution were also investigated during roll bonding process. The AA1050 sheets located in the outer layer mainly consist of shear texture components and the AA5182 sheet located in the center layer consists of plane strain texture components. With differential speeds of the top and bottom rolls, roll bonding was also carried out. Elongation along the RD and TD was improved at a speed difference of approximately 10%?20%.
장재형(Jaehyung Jang),임재현(Jaehyeon Lim) 한국국제조세협회 2015 조세학술논집 Vol.31 No.2
The credibility of tax law as a subpart of the legal system depends on the preciseness of its concepts and scopes thereof. Tax expenditures, as one of the groundwork for tax law, need detailed analysis and review. Many important financial control systems such as the tax expenditure budgetary system required by the 「National Finance Law」 amended in 2010 or the preliminary feasibility study on new tax preferential regulation required by the 「Tax Reduction and Exemption Control Act」 amended in 2014 are based on the concept and the scope of tax expenditures. Since the tax expenditures are the exception to the benchmark tax system, constitutional principles should be applied in a different way. In view of tax equalitarianism, tax expenditures should be kept at a minimum necessary level, and the benefit of the doubt in the interpretation of the clause (in dubio pro fisco) should be given to the tax authority. Tax expenditures defined in the 「Tax Reduction and Exemption Control Act」 and the 「Tax Expenditure Budgetary Report」 are “departure from the benchmark tax system, such as tax exemption, tax reduction, tax credit, tax allowance, preferential tax rate or tax deferral made under certain requirements, having the characteristic of financial expenditures.” Tax expenditures of Republic of Korea in 2015 amounted to 33.5 trillion won, among which 18.5 trillion won are from the 「Tax Reduction and Exemption Control Act」 and 14.5 trillion won are from individual tax law such as the 「Income Tax Law」. Main objective of this study is to ascertain whether the items of the Tax Expenditure Budgetary Report match the definition of tax expenditures. Different countries have used various specific criteria for the tax expenditures. The United States and Canada use a broadly defined definition for tax expenditures, while the United Kingdom and Germany apply a narrower scope of tax expenditures. The United Kingdom distinguishes between tax expenditures and ‘structural reliefs’, and Germany only makes reference to aid to enterprises and business sectors of the economy. In particular, many countries commonly exclude some measures from the scope of tax expenditures, such as a allowance for family units, credit for pension, and a tax deferral, because these measures lack particularity concerning beneficiaries, do not serve a particular purpose other than the efficient operation of the tax system, and are not administratively feasible to eliminate. If the tax expenditures included in the 「Tax Expenditure Budgetary Report」 are analyzed by the same logic, some measures have more characteristics of the structural norm than of tax expenditures. Even under the broadest definition for tax expenditures, personal or family allowances for individual income tax, deemed input VAT credit, and pension credit, which constitute over 20 percent of the entire amount of tax expenditures, are more of the structural norm than tax expenditures. Although the number of such measures is not so high, since their revenue amounts are large in sum, they can distort the tax policy. Accordingly, the scope and concept of tax expenditures must be defined in a lucid manner and in concordance with internationally used criteria for tax expenditures. Then, the tax policy on the reduction of tax expenditures will be clearly made and be implemented without.
Compact Optical Autocorrelator with 0.1-Meter Scanning Range Using a Rotating Pair of Mirrors
장재형(Jaehyung Jang),이승후(Seunghoo Lee),이우정(Woojeong Lee),임현우(Hyeonwoo Lim),이주형(Joohyung Lee) Korean Society for Precision Engineering 2021 한국정밀공학회지 Vol.38 No.5
We present a rotating pair of mirrors based optical autocorrelator which is capable of providing a 0.1 m scanning range. The rotating mirror-pair technique enables rapid data update-rate, compactness, and simpler data post-processing compared to that of conventional linear motion-based optical autocorrelators. We optimized the geometrical design of the mirror-pair configuration by using off-the-shelf mirrors and conducted a simulation to calculate the expected capability of the scanning range. By exploiting a He-Ne laser as a light source, we validated the performance of the autocorrelator in its provision of a 100 mm scanning range and 0.2 Hz data update-rate, which was limited by the adopted commercial data sampling device, and not limited by the proposed principle. The developed autocorrelator is expected to be adopted for various applications that require sub-cm<SUP>-1</SUP> spectroscopic resolution.
Kim, Jaehyung,Lim, Taemook,Ryu, Ho-Geun Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.8
A valve assembly used in nuclear power plants must be qualified and supervised. New technical standards such as ASME QME-1 2007 particularly require detailed qualification using experiment and analysis. Particularly, diagnostic tests and engineering studies are required for qualification of ASME QME-1 2007. Among these studies, the research on the measurement of friction coefficient and packing stress is important. The irregular change of packing stress along the stroke distance occurs because of the abnormal phenomenon, which must be found and studied with quantitative methods. Packing stress should be analyzed conservatively through experimentation and analysis. In this study, various formulas were applied to measure and calculate coefficient of friction and packing stress. This study can be used in relation to qualification and supervision of packing materials. And the calculation using static diagnosis test can be used to find the packing frictional force in dynamic diagnosis test with flow pressure in a pipe. This study has made it possible to reliably consider packing frictional force generated in a valve body. And so, it is believed that more margin can be secured when evaluating the capacity of valve actuator by applying the accurate frictional force generated in the valve assembly.
Sensitive and Selective Detection of HIV-1 RRE RNA Using Vertical Silicon Nanowire Electrode Array
Lee, Jaehyung,Hong, Min-Ho,Han, Sanghun,Na, Jukwan,Kim, Ilsoo,Kwon, Yong-Joon,Lim, Yong-beom,Choi, Heon-Jin Springer US 2016 NANOSCALE RESEARCH LETTERS Vol.11 No.1
<P>In this study, HIV-1 Rev response element (RRE) RNA was detected via an Au-coated vertical silicon nanowire electrode array (VSNEA). The VSNEA was fabricated by combining bottom-up and top-down approaches and then immobilized by artificial peptides for the recognition of HIV-1 RRE. Differential pulse voltammetry (DPV) analysis was used to measure the electrochemical response of the peptide-immobilized VSNEA to the concentration and types of HIV-1 RRE RNA. DPV peaks showed linearity to the concentration of RNA with a detection limit down to 1.513 fM. It also showed the clear different peaks to the mutated HIV-1 RRE RNA. The high sensitivity and selectivity of VSNEA for the detection of HIV-1 RRE RNA may be attributed to the high surface-to-volume ratio and total overlap diffusion mode of ions of the one-dimensional nanowire electrodes.</P>