• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 2004.10a
• /
• pp.367-370
• /
• 2004

본 연구에서는 lot-for-lot 정책으로 운영되는 불균등한 bargaining power를 갖는 단일 생산자와 단일 수요가로 구성된 공급망 시스템에서 생산자와 수요가의 생산량(또는 주문량)의 결정을 위한 통합 모델과 이에 따르는 통합효과의 적정 배분방법을 제안하고자 한다. Quantity incentive라는 개념을 고안하여 공급망 시스템에서 우위를 점하고 있는 생산자(또는 수요가)에게 수요가(또는 생산자)가 현재의 운영정책의 변경을 요구하고 이에 상응하는 보상금을 지불하는 형태의 조정방법을 제안하고자 한다. 이러한 과정을 통해 안정적인 공급망 시스템 운영을 위한 통합 효과의 적정 배분 방법을 추가적으로 제시하고자 한다.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 2004.10a
• /
• pp.574-577
• /
• 2004

본 연구에서는 lot-for-lot 정책으로 운영되는 불균등한 bargaining power를 갖는 단일 생산자와 단일 수요가로 구성된 공급망 시스템에서 생산자와 수요가의 생산량(또는 주문량)의 결정을 위한 통합 모델과 이에 따르는 통합효과의 적정 배분방법을 제안하고자 한다. Quantity incentive라는 개념을 고안하여 공급망 시스템에서 우위를 점하고 있는 생산자(또는 수요가)에게 수요가(또는 생산자)가 현재의 운영정책의 변경을 요구하고 이에 상응하는 보상금을 지불하는 형태의 조정방법을 제안하고자 한다. 이러한 과정을 통해 안정적인 공급망 시스템 운영을 위한 통합 효과의 적정 배분 방법을 추가적으로 제시하고자 한다.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.9 no.3
• /
• pp.510-515
• /
• 2005

Doppler spread can occur due to the relative movement of transmitter and receiver. The Doppler frequency shift varies as the relative location and the velocity of transceivers change. This Doppler spread may seriously degrade the performance of OFDM system which is considered to be very efficient for multimedia wireless communication. Therefore, applying the method of receiver diversity, we analyze the degree of BER improvement in Doppler spread environments to investigate the effectiveness of the chosen methods according to various wireless channels.

• Journal of the Institute of Electronics Engineers of Korea SD
• /
• v.45 no.10
• /
• pp.15-22
• /
• 2008

The bulk-planer MOSFET has a scaling limitation due to the short channel effect (SCE). The Double-Gate MOSFET (DG-MOSFET) is a next generation device for nanoscale with excellent control of SCE. The quantum effect in lateral direction is important for subthreshold characteristics when the effective channel length of DG-MOSFET is less than 10nm, Also, ballistic transport is setting important. This study shows modeling and design issues of nanoscale DG-MOSFET considering the 2D quantum effect and ballistic transport. We have optimized device characteristics of DG-MOSFET using a proper value of $t_{si}$ underlap and lateral doping gradient.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• v.9 no.2
• /
• pp.887-890
• /
• 2005

The double gate(DG) MOSFET is a promising candidate to further extend the CMOS scaling and provide better control of short channel effect(SCE). DGMOSFETs, having ultra thin updoped Si channel for SCEs control, are being validated for sub-20nm scaling, A channel effects such as the subthreshold swing(SS), and the threshold voltage roll-off(${\Delta}V_{th}$). The propsed model includes the effects of thermionic emission and quantum tunneling of carriers through the source-drain barrier. The proposed model is used to design contours for gate length, channel thickness, and gate oxide thickness.

• Bulletin of the Society of Naval Architects of Korea
• /
• v.26 no.2
• /
• pp.41-48
• /
• 1989

This paper investigates the relationship between strain hardening exponents(n) of various marine materials and fatigue crack retardation effect after applying single overload. Using the four different sheet materials, following results are obtained. (1) The fatigue crack propagation rate after applying single overload was retarded and the effects of this retardation were closely related to the strain hardening exponent. (2) The larger the strain hardening exponents were, the more were the fatigue crack retardation effects after applying single overload. (3) The considerable crack closure with the applying of a overload was observed in matrals with large strain hardening exponent. When n is smaller than 0.1, the fatigue crack retardation effects are negligible. On the contrary, when n is larger than 0.2 the fatigue crack retardation effects are significant.

• Journal of the Korean earth science society
• /
• v.24 no.3
• /
• pp.141-149
• /
• 2003

This study investigated the effect of gender grouping on cooperative learning on the basis of student achievement and science-teaming attitude. Homogeneous and heterogeneous gender groupings were used in the treatment groups for the learning strategies of earth science. Traditional instruction was performed for the control group. Three classes at a middle school were assigned to the groups. Before the treatment instruction, a questionnaire about science-learning attitude was administered to 144 students, and their scores were utilized as covariate. Then, the same questionnaire was given with a test of science achievement designed in this study. The changes in both achievement and attitude among the three groups were analyzed statistically. Significant differences were not shown in science achievement or in the difference of gender with respect to perceptions about science. There were significant changes between the homogeneous and heterogeneous gender grouping in their attitudes toward science instruction. Here the cooperative learning group, regardless of the gender grouping, tends to exhibit more positive perceptions towards their learning environment than the control group, particularly in female students.

• The Journal of the Korea Contents Association
• /
• v.8 no.10
• /
• pp.37-44
• /
• 2008

This paper presented a solution to encryption and decryption problem suffering data transmission error for encrypted message transmission. Block cypher algorithms experience avalanche effect that a single bit error in an encrypted message brings substantial error bits after decryption. The proposed fault tolerant scheme addresses this error avalanche effect exploiting a multi-dimensional data array shuffling process and an error correction code. The shuffling process is to simplify the error correction. The shuffling disperses error bits to many data arrays so that each n-bit data block may comprises only one error bit. Thereby, the error correction scheme can easily restore the one bit error in an n-bit data block. This scheme can be extended on larger data blocks.

• The Journal of the Korea Contents Association
• /
• v.14 no.6
• /
• pp.491-498
• /
• 2014

Programming learning tend to improve the high thinking ability by experiencing problem solving process through programming recently, There are the previous studies that small group cooperative learning has the effect of the learning that is based logical thinking and creativity, while programming learning has relied on individual learner's thinking and principles traditionally. In this paper, it was verified the effect on improving the problem solving ability to perform by the small cooperative learning group in a problem solving process of programming learning. For this, it was developed and applied a model that include small cooperative learning group based on the problem solving 5 steps. The results of this study showed that the small cooperative learning group has positive effect of the problem solving ability in programming learning and has no relationship with cognitive style.

• Proceedings of the Korea Association of Crystal Growth Conference
• /
• 1997.10a
• /
• pp.27-31
• /
• 1997

액상법에 의한 단분산 ZnS입자의 합성을 60~9$0^{\circ}C$에서 행하여, 반응조건이 ZnS입자의 형태에 미치는 효과를 검토했다. ZnS입자의 형태는 반응 시간의 경과와 더불어 단분산으로부터 다분산 혹은 응집체로 변화하였다. 반응 온도 60~9$0^{\circ}C$에서 초기 농도적이 중간값이고, 반응시간이 짧을 경우 입경 0.2~0.8$\mu\textrm{m}$의 구상 단분산 입자를 얻었다. 또한 Ag$_2$NO$_3$, EtOH용액, $0^{\circ}C$에서, Ag$_2$S에 의한 ZnS의 균일 피복이 가능하였다.