• Journal of Mushroom
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• v.19 no.3
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• pp.160-165
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• 2021

This study was conducted to investigate a suitable substrate formulation for bag cultivation of Hypsizygus marmoreus. To determine the optimum media composition for H. marmoreus, chemical properties of various media and culture properties were investigated. The fastest primordia formation (9.0 days), the shortest fruiting body harvest period (18.0 days), and the highest yield (144.7 g/bag) were realized with the T6 formulation (55:15:20:5:5 mixing ratio of poplar sawdust, wheat bran, rice bran, dried soybean powder, and palm kernel, respectively). The chemical properties of the T6 formulation were pH, 6.0; total carbon, 19.0%; total nitrogen, 0.83%; C/N ratio, 22.8; P₂O₅, 0.61%; K₂O, 0.46%; and MgO, 0.29%. This is the first attempt using plastic bags for cultivation and will help expand the production of H. marmoreus.

• The Korean Journal of Applied Statistics
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• v.24 no.6
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• pp.987-994
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• 2011

From the point view of credit evaluation whose population is divided into the default and non-default state, two methods are considered to estimate conditional distribution functions: one is to estimate under the assumption that the data is followed the mixture normal distribution and the other is to use the kernel density estimation. The parameters of normal mixture are estimated using the EM algorithm. For the kernel density estimation, five kinds of well known kernel functions and four kinds of the bandwidths are explored. In addition, the corresponding ROC functions are obtained based on the estimated distribution functions. The goodness-of-fit of the estimated distribution functions are discussed and the performance of the ROC functions are compared. In this work, it is found that the kernel distribution functions shows better fit, and the ROC function obtained under the assumption of normal mixture shows better performance.

• Journal of the Korea Institute of Military Science and Technology
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• v.17 no.6
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• pp.773-785
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• 2014

For decades, modeling of pilots has been intensively studied due to its advantages in reducing costs for training and enhancing safety of pilots. In particular, research for modeling of pilots' non-kinetic behaviors which refer to the decisions made by pilots is beneficial as the expertise of pilots can be inherent in the models. With the recent growth in the amount of combat logs accumulated, employing statistical learning methods for the modeling becomes possible. However, the combat logs consist of heterogeneous data that are not only continuous or discrete but also sequence independent or dependent, making it difficult to directly applying the learning methods without modifications. Therefore, in this paper, we present a kernel function named hybrid sequence kernel which addresses the problem by using multiple kernel learning methods. Based on the empirical experiments by using combat logs obtained from a simulator, the proposed kernel showed satisfactory results.

• Journal of the Korea Society for Simulation
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• v.17 no.4
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• pp.71-80
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• 2008

In this study, a simulation framework, which can support developing various simulation systems for the improvement of process planning in shipbuilding such as the block erection, the block turn-over, and so on, is proposed. In addition, a simulation kernel, which is a key component of the simulation framework, is implemented according to the concept of the combined discrete event and discrete time simulation. To evaluate the efficiency and applicability of the proposed simulation framework, it is applied to the block erection process in shipbuilding. The result shows that the proposed simulation framework can provide the consistent, integrated development environment for a simulation system, as compared with existing studies and commercial simulation systems.

• Proceedings of the Korea Information Processing Society Conference
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• 2000.10a
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• pp.833-836
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• 2000

지금까지 침입탐지시스템은 침입행위를 어떻게 판단할 것인가 하는 부분에 많은 연구가 진행되었다. 고속 네트워크과 다양한 사용자의 요구는 침입탐지시스템이 더 많은 데이터의 처리를 요구하게 되었고, 많은 크래커들에 의해서 더욱 새롭고 다양한 침입방법이 소개되었다. 침입탐지시스템은 새로운 침입 방법과 더 많은 데이터를 실시간으로 처리하기 위해서는 고성능의 그리고 지능형의 데이터 처리 기술이 절실하다. 본 논문은 실시간 데이터 처리와 새로운 침입 방법에 대해서 능동적인 대처를 위해서 멀티 에이전트 기반의 분산 침입탐지기술과 데이터 중심의 비정상행위 탐지 기술인 커널 기반의 침입탐지기술의 혼합형 침입탐지시스템을 제안한다.

• The Transactions of the Korea Information Processing Society
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• v.7 no.1
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• pp.74-87
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• 2000

PVM (parallel virtual machine) provides a programming environment that allows a collection of networked workstations to appear as a single parallel computational resource. The performance of parallel applications in this environment depends on the performance of data transfers between tasks. In this paper, we present a new Myrinet-based communication model of PVM that improves PVM communication performance over a high-speed Myrinet LAN. The proposed PVM communication model adopts a communication mechanism that allows any user-level process to directly access the network interface board without going through UDP/IP protocol stacks in the kernel. This mechanism provides faster data transfers between PVM tasks over the Myrinet since it avoids data copy overhead from kernel (user space) to user space (kernel) and reduces communication latency due to network protocol software layers. We implemented EPVM (Enhanced PVM), our updated version of the traditional PVM using UDP/IP, that is based on the proposed communication model over the Myrinet. Performance results show EPVM achieves communication speed-up of one to two over the traditional PVM.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10c
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• pp.581-583
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• 1999

IEEE1394는 다양한 디지털 기기들이 고속의 시리얼 버스를 통해 데이터를 송수신할 수 있는 홈네트워킹 기술 표준이다. 현재 이 기술을 이용하여 인터넷과 연결하기 위한 표준화가 IETF에서 진행중이다. 본 논문에서는 리눅스 호스트에 장착된 IEEE1394 호스트 어댑터를 작동시킬 수 있는 디바이스 드라이버와 IETF에서 상정한 IPv4-over-1394 초안을 기초로 하여 이더넷과 IEEE1394를 연결하는 게이트웨이를 개발하였다. 본 논문에서는 IEEE1394용 리눅스 드라이버 모듈과 IPv4-over-1394를 구현한 커널 모듈의 구조를 설명하여 이더넷과 IEEE1394의 혼합 네트워크 환경에서 인터넷 응용 프로그램의 수행 실험으로 구현 모듈을 검증하였다.

• Journal of the Korean Data and Information Science Society
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• v.23 no.4
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• pp.739-748
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• 2012

In this paper we propose a mixed effects least squares support vector machine (LS-SVM) for the censored data which are observed from different groups. We use weights by which the randomly right censoring is taken into account in the nonlinear regression. The weights are formed with Kaplan-Meier estimates of censoring distribution. In the proposed model a random effects term representing inter-group variation is included. Furthermore generalized cross validation function is proposed for the selection of the optimal values of hyper-parameters. Experimental results are then presented which indicate the performance of the proposed LS-SVM by comparing with a standard LS-SVM for the censored data.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.27 no.5
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• pp.337-343
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• 2014

This paper presents a continuum-based shape design sensitivity analysis(DSA) method for crack propagation problems using a reproducing kernel method(RKM), which facilitates the remeshing problem required for finite element analysis(FEA) and provides the higher order shape functions by increasing the continuity of the kernel functions. A linear elasticity is considered to obtain the required stress field around the crack tip for the evaluation of J-integral. The sensitivity of displacement field and stress intensity factor(SIF) with respect to shape design variables are derived using a material derivative approach. For efficient computation of design sensitivity, an adjoint variable method is employed tather than the direct differentiation method. Through numerical examples, The mesh-free and the DSA methods show excellent agreement with finite difference results. The DSA results are further extended to a shape optimization of crack propagation problems to control the propagation path.

• Journal of Service Research and Studies
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• v.5 no.1
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• pp.57-70
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• 2015

This paper develop curnel based high speed packet filtering imbedded gateway and firewall using cloud database. This study develop equipment include of predict function through bigdata analysis using cloud system. This equipment include intrusion prevention for network attack, and include system security function of L7 switch based contents. This study can improve security level of little company and general family. This study can pioneer a new market. This study can develop high perfomance switch and replacement of existing security equipment. This study proposed new next generation algorithm for constuction of high performance system from low specifications.