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Allocation in Multi-way Stratification by Linear Programing
NamKung, Pyong,Choi, Jae-Hyuk 한국통계학회 2006 Communications for statistical applications and me Vol.13 No.2
Winkler (1990, 2001), Sitter and Skinner (1994), Wilson and Sitter (2002) present a method which applies linear programing to designing surveys with multi-way stratification, primarily in situation where the desired sample size is less than or only slightly larger than the total number of stratification cells. A comparison is made with existing methods both by illustrating the sampling schemes generated for specific examples, by evaluating sample mean, variance estimation, and mean squared errors, and by simulating sample mean for all methods. The computations required can, however, increase rapidly as the number of cells in the multi-way classification increase. In this article their approach is applied to multi-way stratification using real data.
Namkung, Hueon,Kim, Hyung-Taek,Wang, Fuchen,Lin, Kuangfei,Yu, Guangsuo Springer-Verlag 2017 Korean Journal of Chemical Engineering Vol.34 No.12
<P>Particle stickiness is a key parameter for increasing ash deposition in gasification process. We conducted multilateral investigations to evaluate particle stickiness of coal ash at low temperature fouling conditions through Watt and Fereday's viscosity model, dilatometry (DIL) and laser flash apparatus (LFA) technique. Seventeen coals were employed for ash deposition experiments under gasification condition through drop tube furnace (DTF). The low viscosity not only led to increasing ash deposition behavior, but also increasing the particle size of deposited ash. From DIL analysis, the ash sintering behavior increased with increasing temperature due to increase of particle stickiness. The high amount of Fe2O3, CaO and MgO components resulted in low sintering temperature and high reduction of physical length. Through LFA analysis, the thermal conductivity increased with increasing temperature, because of increasing particle stickiness. In addition, its value was correlated with the propensity of common fouling indices.</P>
Namkung, Junghyun,Kim, Kyunga,Yi, Sungon,Chung, Wonil,Kwon, Min-Seok,Park, Taesung Oxford University Press 2009 Bioinformatics Vol.25 No.3
<P>Gene-gene interactions are important contributors to complex biological traits. Multifactor dimensionality reduction (MDR) is a method to analyze gene-gene interactions and has been applied to many genetics studies of complex diseases. In order to identify the best interaction model associated with disease susceptibility, MDR classifiers corresponding to interaction models has been constructed and evaluated as a predictor of disease status via a certain measure such as balanced accuracy (BA). It has been shown that the performance of MDR tends to depend on the choice of the evaluation measures.</P>
Revision of the Fauna of Korean Spiders (Arachnida: Araneae)
Namkung, Joon,Kim, Seung-Tae,Lee, Joon-Ho Korean Society of Applied Entomology 2000 INSECTA KOREANA Vol.17 No.4
A list of Korean spiders was revised, including 46 families 225 genera 622 species which were reported by December 1999. Of these 61 added species and 37 alterated scientific names were supplemented, and 3 species, which have been reported since June 1994, were newly synonymized. The spider fauna of Korea is composed of 12 Cosmopolitan, 34 Holarctic, 66 Palearctic and 136 Korean endemic species. The spider fauna of Korea has much more similarity with Japanese spider fauna than with those of other countries.
Effect of Si addition on the magnetic properties of melt-quenched Ni–Fe alloy strip
Namkung, J.,Kim, M.C.,Park, C.G. Elsevier Sequoia 2007 Materials science & engineering Structural materia Vol.449 No.-
<P><B>Abstract</B></P><P>A sheet manufacturing technology for 79Ni–Fe alloy, which is highly permeable and has soft magnetic properties, was developed based on the melt drag casting method. Melt drag strip was manufactured using the new 79Ni–Fe–Si alloy designed considering the strip forming ability and soft magnetic properties in the single-roll casting method. The microstructure and soft magnetic properties were measured based on following casting and heat treatment processes. Oxygen concentration within the air-heated molten 79Ni–Fe alloy decreased rapidly following the addition of a small quantity of Si to the existing 79Ni–Fe alloy. Moreover, the effect of enhancing the strip-forming ability was determined by increasing the liquidus line temperature and solidus line temperature interval of 79Ni–Fe alloy with the additional Si concentration. As a result of cold processing and proper heat treatment, the melt drag cast 79Ni–19Fe–2Si alloy exhibited excellent soft magnetic properties compared with the 79Ni–Fe alloy strip. Therefore, the forming ability of melt drag strip can be enhanced by adding a small quantity of Si to the traditional 79Ni–Fe alloy. Likewise, soft magnetic properties can be enhanced by reducing oxygen concentration within the molten metal.</P>
Namkung, Yong,Lee, Chung-Choo,Oh, Moon-You 제주대학교 1980 논문집 Vol.12 No.-
The polymorphism of the Group-Specific Component(Gc) was studied in serum samples from Jeju-do population of Korea using thin layered (1mm) polyacrylamide gel isoelectric focusing (PAGIF). Six common subtypes, 1F-1F, 1F-1S, 1S-1S, 1S-2, 1F-S and 2-2, were found. The allele frequencies were for Gc 1F;0.518, for 1S;0.312 and for Gc 2;0. 170, respectively. The heterogeneity rate was 0.5065.
A New Species of Cave Dwelling Grylloblattoidea (Grylloblattidae) from Korea
Namkung, Joon 한국곤충학회 1974 Korean journal of entomology Vol.4 No.1
원시무시곤충으로 주목되고 있는 Grylloblattoidea는 1914년 E.M. Walker가 최초로 발표한 이래, 북미각지에서 7종.2아종, 일본에서 5종, Siberia에서 1종이 기재된 바 있으나 우리나라에서는 아직껏 밝혀진 바가 없다. 저자는 1966년 6월 보한강상류인 정선군 비룡동굴에서 완전한 1성웅을 채집한 바 있어 여기에 Gallcisiana biryongensis(비룡갈르와 벌레)로 명명 기재한다. 본종은 다양색.무안.체장 34mm로 기지의 어느 것보다도 대형종이다. 대체적구조는 일본산 Galloisiana nipponensis에 닮으나 제10복배판 끝 Supra-anal plate가 둔만년필촉과 같이 무듸게 되며, 북미종과는 부절욕반이 있음에서 외관상으로도 분명히 구별된다. 본종의 중요 표징은 다음과 같다. (1) 두부는 편본하고 폭이 약간 넓은 원형으로 두개선이 명료하고, 복안은 퇴화되었으나 강대한 안부강모가 나있다. (2) 전흉배는 저대한 정방형, 중흉배는 전변이 좁은 제형, 후흉배는 전변이 약천 좁은 제형으로 각 측연과 중앙부에 불규칙한 강모가 나있다. (3) 복배판은 제4, 5절이 최대이며, 각 절의 하변에 8개, 측연에 1개씩의 강모가 정열하며 제10배판 끝은 순한 만년필촉 꼴로 일견 2분 된 듯한 감을 준다. (4) 미모는 9절로 되며, 각 말단부에 3,4재의 장강모가 나 있고, 미세 투명한 긴 감각모가 보인다. (5) 보각은 완장하며 부절욕반이 명료하다. (6) 웅생식기관은 복잡한 구조를 갖추며, 복지는 좌우비대칭으로 좌지는 폭광인 ?꼴이고, 우지는 장삼각형으로 기부끝에 투명한 단추꼴 돌기가 보인다. (7) 대형의 주름진 반전낭이 우음경엽부에서 돌출하고 있으며, 비교적 완장한 주음경과 부음경이 보인다.
Prediction of coal fouling using an alternative index under the gasification condition
Namkung, H.,Xu, L.H.,Kang, T.J.,Kim, D.S.,Kwon, H.B.,Kim, H.T. Applied Science Publishers 2013 APPLIED ENERGY Vol.102 No.-
Coal gasification was carried out in order to verify the coal fouling tendency in the drop tube furnace (DTF), which can simulate an entrained-bed gasifier. Thirteen pulverized coal samples, in the range of bituminous and sub-bituminous, were utilized, and compared, with predictions using a wide range of empirical indices. Large discrepancies were noted in most cases, with respect to experimental results, ash deposition rates, and different indices. Some indices used for anticipating fouling tendency are not co-related with the results of this experiment. A newly approached index, which is especially important considering the diffusivity parameter, looks at the ratio of acid and alkali mineral matters injected into gasifier and heat flux, indicates that traditional expressions are modified to account for other parameters which influence the ash deposition phenomenon. The alternative index resulted in improved correlations between predictions and experimental observations.
A Study on Nonresponse Errors in the Internet Survey
Namkung, Pyong,Kim, Min Jung 한국통계학회 2002 Communications for statistical applications and me Vol.9 No.3
The advantage of internet survey compared to the traditional survey methods are speedy in data collection, cost-effective, high performed design and able to data process and analysis at the same time. The other side are difficult to select sample, come from serious nonresponse errors. We suggest the new internet survey method to the questionnaire design that have the high response rate, enough to advanced preparations and system stability.