http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Fu Yang,Gang Chen,Yu Kang,Dongmin Ma,Qilin Chen,Tian Tao,Fu Deliang 한국지질과학협의회 2020 Geosciences Journal Vol.24 No.2
The U-Pb ages of single zircon grains contained in the sandstone samples were analyzed by the LA-ICP-MS method, the sediment provenances and geological significance were discussed. The LA-ICP-MS zircon U-Pb dating from the sandstones, tuffaceous sandstones and volcanic tuffs of the Pingliang and Zhaolaoyu Formations along the southwestern Ordos Block are used to limit the maximum depositional age and material sources. The results show that: (1) The youngest ages of zircon dating in the three samples are 445 Ma, 444 Ma and 443 Ma, respectively, suggesting that the studied Formations were deposited in the Late Ordovician. (2) The detrital zircon U-Pb age analysis of the sandstones sample from the Pinliang Formation clustered in the 445–477 Ma, 588–1548 Ma and 1612–2496 Ma with the corresponding youngest peak age of 454.5 ± 3.3 Ma. (3) The distribution of zircon U-Pb age in sandstone samples showing that the sedimentary rocks detritus was mainly sourced from the North Qinling-Qilian terranes and the NCC, and has double provenance supply in the north and south. The material source of the tuffaceous sandstones and volcanic tuffs mainly comes from the volcanic and magmatic activity related to the North Qilian-North Qinling Island Arcs.
장창식,강맹규 한양대학교 공학기술연구소 1993 공학기술논문집 Vol.2 No.1
Given a case of known dimensions, a collection of rectangular boxes of different size, and number of boxes of each type, the problem is to find suitable positions for placing the boxes in the case in such a way that spaces required can be minimized. You occasionally face this problem at business, shipment or truck cargo area. This paper developes three dimensional space cutting, space packing, space merging techniques. The method proposed is verified superious to any others with comparision.
동일하지 않는 병렬기계 시스템에서 지연작업수를 최소화하는 Tabu Search 방법
전태웅,강맹규 한국경영과학회 1995 經營 科學 Vol.12 No.3
This paper presents a Tabu Search method to minimize a number of tardy jobs in the nonidentical parallel machine scheduling. The Tabu Search method employs a restricted neighborhood for the reduction of computation time. In this paper, we use two different types of method for a single machine scheduling. One is Moore's algorithm and the other is insertion method. We discuss computational experiments on more than 1000 test problems.
김헌태,권상호,지영근,강맹규 한국경영과학회 2003 한국경영과학회지 Vol.28 No.2
The traveling salesman problem (TSP) is an NP-hard problem. As the number of nodes increases, it takes a lot of time find an optimal solution. Instead of considering all arcs, if we select and consider only some arcs more likely to be included in an optimal solution, we can find efficiently an optimal solution. Arc candidate set is a group of some good arcs. For the Lack of study in the asymmetric TSP, it needs to research arc candidate set for the asymmetric TSP systematically. In this paper, we suggest a regression function determining arc candidate set for the asymmetric TSP. We established the function based on 2100 experiments, and we proved the goodness of fit for the model through various 787 problems. The result showed that the optimal solutions obtained from our arc candidate set are equal to the ones of original problems. We expect that this function would be useful to reduce the complexity of TSP.
Characteristics of Gas- and Particle-phase Acids and NH₃at Urban and Rural Sites in Korea
Chang-Jin Ma(Chang-Jin Ma),Hui-Kang Kim(Hui-Kang Kim),Gong-Unn Kang(Gong-Unn Kang),Susumu Tohno(Susumu Tohno),Mikio Kasahara(Mikio Kasahara) 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.E1
To study the characteristics of ammonia and the related compounds, atmospheric aerosols and gases were collected using a triple filter pack sampler, a low volume air sampler, and a three-stage Andersen air sampler in Seoul and Kangwha Island, Korea from Dec. 1996 to Oct. 1997. Ammonia concentrations showed approximately two times higher in summer than in winter at both sites. The highest HNO₃ levels were generally observed in summertime at two sampling sites. The average mass concentration of PM_2.5 in heavily industrialized Seoul was about three times higher than that of Kangwha. In winter, the sum of NH₄^+ and its counter ions (such as CI^-, NO₃^-, and S0₄²^-) comprised 30-41% of PM_2.5 mass concentration at each sampling site. Temperature dependence of particulate nitrate was examined at the urban sampling site. The formation of the nitrate in the fine mode was dependent not only on the amount of precursors but also on the variation of temperature. (NH₄)S0₄and NH₄HS0₄coexisted with NH₄NO₃and NH₄Cl at each site. According to the summertime backward trajectory analysis. NO₃- showed higher level with air parcels transported from northeast Asian continent. On the other hand, the concentration of SO₄²- showed significantly higher level when air masses originated from Pacific Ocean, southern part of Japan. and Korea.
An Experimental Estimation of Two Detection Limit Models
Chang-Jin Ma(Chang-Jin Ma),Susumu Tohno(Susumu Tohno),Mikio Kasahara(Mikio Kasahara),Gong-Unn Kang(Gong-Unn Kang) 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.E1
In environmental studies, decisions are often made on the analytical data indicating certain contaminants as being "detected" or "non-detectible." Since detection limits are analytical method specific, one has to first review the concepts and definitions associated with analytical method systems and specifications. In this study, the experimental analytical values for a series of low level standards (for an ionic species) were used as an example to estimate two different method detection limits (MDL). The scores of EPA's MOL and Pallesen's MDL determined by real analytical scores are 0.0575 and 0.0561 mg/L, respectively for our nitrate data. These scores determined by two different MDL models are roughly similar, while there are apparent differences between two methods with respect to statistical and systematical procedure. However, detennination of MDL for one's laboratory provides some practical applications which helps to assure one's regulating authorities that one's measured scores are accurate.
Kang Ma,Xihao Ye,Haifeng Yu,Ruoyang Wu,Yong Li,Weibin Li 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.3
To study the seismic behavior and influencing factors of prefabricated steel frame composite joints, cyclic loading tests of two groups of scaled specimens were carried out, and the refined numerical model was established and its validity was verified. The failure mode, hysteretic behavior and moment-rotation curve of composite joints and pure steel joints were compared, and the influence of composite slab on the mechanical properties of joints was summarized. At the same time, the parameters of the key components were selected as variables to study the changing law of the stress properties of the joints. The results indicate that the main failure modes of the overhanging end plate connection are end plate yield, bolt breakage and stiffener buckling, and the composite joints will also have local crushing of composite slab. The factors that significantly affect the bearing capacity and initial rotational stiffness of joints include the thickness of end plate, the setting of end plate stiffener, the extension of end plate, the strength of steel, the thickness of slab and the diameter of steel bars. In addition, the shape of end plate stiffeners has obvious influence on the stress distribution of joints. Finally, the calculation model of the overhanging end plate connection composite joint's initial rotational stiffness was proposed, and the stiffness superposition method was used to consider the bending stiffness of the end plate. At the same time, its reliability and high accuracy were verified, which was of great significance to engineering application.
The Linkage between Employment and Population Movements in the Decentralisation Process
Ma, Kang-Raea 韓國地域開發學會 2008 韓國地域開發學會誌 Vol.20 No.4
고용의 공간적 재배치는 인구의 공간적 이동과 밀접한 관계를 갖는다. 국내외 주요도시들에서 직장지와 주거지를 잇는 통근통행의 소요시간이 수년 혹은 수십 년간 그다지 큰 변화를 보이지 않았다는 사실은 공간구조의 분산화 및 교외화 과정 속에서 인구와 고용이 긴밀한 연관관계 하에 재배치 되었다는 것을 의미하는 것이다. 본 연구는 인구주택총조사 2%표본의 네시점자료(1990, 1995, 2000, & 2005)를 이용하여 수도권에서 고용과 인구의 분산화가 어떻게 진행되었는지를 확인하고, 인구와 고용의 재배치 속에서 나타나는 역동적 인과 관계성에 대해 명확히 하고자 하였다. 이를 위해 먼저, 고전적 단일중심모형을 인구와 고용으로 나누어 추정하여 공간구조 분산화의 대략적 패턴에 대한 이해를 도모하였다. 두 번째로 인구와 고용의 인과관계성을 확인하기 위해 그랜져 인과관계 검정(Granger Causality Test)을 이용하여 실증분석을 수행하였다. 분석결과, 과거 15년간의 수도권은 해외의 거대 도시들이 보여왔던 것처럼 괄목할 만한 인구고용의 분산화가 진행되어 왔음을 알 수 있었으며 인구의 교외화가 고용의 교외화를 주도하고 있음을 확인할 수 있었다. 수도권의 직장과 인구의 분산화에 관한 현상적 이해를 도모한 본 논문의 연구결과를 기반으로 향후 연구에서는 이러한 현상에 관한 맥락적 해석이 필요하다고 판단된다.