• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.34 no.7A
• /
• pp.515-522
• /
• 2009

In this paper, a novel transmission scheme with spatial modulation is proposed for coded orthogonal frequency division multiplexing (OFDM). The multiple-input multiple-output (MIMO) technique, so-called spatial modulation (SM), divides input data into antenna index and data signals, transmitting data signals through the specific antenna chosen by the antenna index. In order to retrieve data stream at the receiver, SM needs to detect the antenna index which means that data signals are transmitted via a certain antenna. For this reason, it should be guaranteed that channel matrix is orthogonal. For the real environment, a MIMO channel has difficulty in maintaining orthogonality due to spatial correlation. Moreover, the receiver of the conventional SM is operated by hard decision, so that this scheme has a limit to be adopted for practical systems. Therefore, soft-output demappers for the conventional and proposed schemes are derived to detect antenna index and data stream by soft decision, and a novel transmission scheme combined with spatial modulation is proposed to improve the bit error rate (BER) performance of the conventional scheme.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.21 no.5
• /
• pp.543-551
• /
• 2015

In this paper, Used on the bridge and ship, investigate the physical relationship of aluminium plate girders(A6082-T6) considering the marine environment. Plate girder will experience the patch loading such as moving load, surcharge in the product life cycle. The ultimate strength of aluminum plate girders subjected to these loads applied multiple numerical model and performed the elasto-plastic large deflection series analysis and was proposed the predicted formula for regression analysis. The predicted formula was shown by the relationship of ultimate strength and slenderness. If the slenderness is low(0-2.3), it causes a 9 % error, and If the slenderness is higher(2.3-4.0), it causes a 1-2 % error. Therefore, the propriety of proposed prediction formular was found to be assess rationally.

• Korean Journal of Plant Resources
• /
• v.15 no.2
• /
• pp.123-127
• /
• 2002

In order to obtain basic informations for selecting early maturing rice varieties which is suitable for early cropping before Alisma plantago in the southern part of Korea. Eleven rice varieties were grown from May to September in 1999∼2001 at Sunchon Youngieon Experiment Field and yield components and yield of plants were investingated. Early maturing rice cv. Jinbubyeo showed higher rough rice yield than any other varieties used in the experiment. It showed high yield components, culm length, panicle length, number of panicles per plant, number of spikelets per panicle and ratio of ripened grains. therefore, it was concluded that Jinbubyeo was the most suitable variety with high yield for the cultivation before Alisma plantago at the southern part of Korea. The heritability of culm length number of spikelets per panicle and rough rice yield were high and that of panicle length number of panicle per plant, ratio of ripened grain and 1,000 grain wt. of milled rice were low. The rough rice yield showed highly significant positive correlations with culm length, panicle length, number of spikelets per panicles and ratio of ripened grains.

• International Commerce and Information Review
• /
• v.15 no.1
• /
• pp.333-356
• /
• 2013

The main purpose of this article is to find out the determinants of usage and performance of the uTradeHub system in Korean SMEs. To achieve the purpose of the study, the research model and the hypotheses were developed based on the previous research on uTradeHub and e-Trade. And to test the research hypotheses, empirical survey was conducted to Korean SMEs which were using uTradeHub services. The results of the empirical analyses are as follows. First, among the external factors, intra-industry competition and transaction intensity were significant determinants of uTradeHub usage level. Secondly, among the internal factors, only CEO's support was found to be a significant determinant. Thirdly, among the IT related factors, IT infrastructure and IT training were positively related to uTradeHub usage level. Finally, the uTradeHub usage level was found to have positive effect both on financial and non-financial export performance of the Korean SMEs.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.19 no.9
• /
• pp.2121-2128
• /
• 2015

In this paper presents a method of extracting reliable and regions of interest (ROI) in barcode for the purpose of factory automation. backgrounds are separated based on directional components and the characteristics of detected patterns. post-processing is performed on candidate images with analysis of problems caused by blur, rotation and areas of high similarity. In addition, the resizing factor is used to achieve faster calculations through image resizing. The input images contained multiple product or barcode for application to diverse automation environments; a high extraction success rate is accomplished despite the maximum shooting distance of 80 cm. Simulations involving images with various shooting distances gave an ROI detection rate of 100% and a post-processing success rate of 99.3%.

• International Area Studies Review
• /
• v.12 no.2
• /
• pp.27-53
• /
• 2008

This paper investigates factors determining the level of nontraditional activities at banks around the world. Specifically, the paper examines what kinds of firm-specific and country-specific characteristics determine the level of noninterest income using a comprehensive multi-country database. This paper focuses beyond the traditional U.S. based analyses and provides detailed asset-liability management practices of banks around the world.The findings suggest that banks' size and loan loss provision, explicit deposit insurance, banking restriction, banking freedom ranking of respective countries, the extent of state and foreign ownership, governance, and transparency of the country have positive effects on the level of nontraditional activities. Greater dependence on traditional lending and financing, market based economy, and multiple bank supervisory bodies in the country have negative associations with noninterest income. The economic development of country however affects the extent of the relationship.

• The Journal of Korean Institute of Next Generation Computing
• /
• v.15 no.4
• /
• pp.80-88
• /
• 2019

Software Defined Networking (SDN) is the future network paradigm of decoupling control and data functions. In SDN structure, it is hard to address scalability in case of large-scale networks because single controller managed thousands of switches in a centralized fashion. Most of previous studies have focused on horizontal scalability, where distributed controllers are assigned to network devices. However, they have abstracted the control plane and the application plane into a single controller. The layer of the common SDN architecture is divided into data plane, control plane, and application plane, but the control plane and application plane have been modeled as a single controller although they are logically separated. In this paper, we propose a analytical traffic model considering the both application plane and control plane based on queuing theory. This model can be used to address scalability issues such as controller placement problem without complicated simulations.

• 한국벤처창업학회:학술대회논문집
• /
• 2020.06a
• /
• pp.45-50
• /
• 2020

최근 계획된 행동이론을 바탕으로 국내 증권형 크라우드펀딩 투자자의 참여의도와 무리행동에 관한 연구를 수행하였다. 연구 결과 계획된 행동이론의 주요변인 중 태도와 주관적 규범은 증권형 크라우드펀딩 투자자의 참여의도에 정(+)의 영향을 미치는 것으로 확인되었다. 그리고 간접효과 분석 결과 참여의도는 태도, 주관적 규범과 무리행동 사이에서 매개적 역할을 하는 것으로 확인되었다. 그러나 계획된 행동이론에서 행동의도의 주요 변인으로 제시된 지각된 행동통제는 참여의도에 미치는 영향이 통계적으로 비유의적인 것으로 나타났다. 대신 무리행동에는 직접적으로 정(+)의 영향을 미치는 것으로 확인되었다. 한편 국내 증권형 크라우드펀딩 투자자는 실제 투자행동을 할 때 플랫폼에서 제공되는 펀딩 진행정보를 일종의 신호로 보고 다수의 다른 투자자를 모방하여 무리행동을 한다는 것을 실증적으로 확인하였다. 본 연구는 종전 연구의 후속연구로서 국내 증권형 크라우드펀딩 투자자의 손실보전기대가 참여의도 및 무리행동에 조절적 역할을 하는지 여부를 연구해 보고자 한다. 손실보전기대는 증권형 크라우드펀딩 투자로 인해 투자자가 받게 되는 각종 혜택이나 투자조건에 따라 크라우드펀딩 투자로 인한 손실 일부 또는 전부를 보전하거나 손실 발생 가능성을 낮출 수 있다고 믿는 정도를 말한다. 본 연구를 통해 국내 증권형 크라우드펀딩 투자와 관련한 각종 혜택 및 투자조건 등이 투자자의 손실보전기대를 유발하여 투자자의 참여의도와 무리행동에 조절적 영향을 미치는지 여부를 실증적으로 확인함으로써 향후 크라우드펀딩 관계 당사자들의 동 제도 활성화 및 투자자 보호를 위한 각종 정책 및 사업계획 수립 등에 유의미한 결과로 활용될 수 있을 것이다.

• Journal of Korean Society of Steel Construction
• /
• v.29 no.1
• /
• pp.1-12
• /
• 2017

This paper proposes nominal flexural strength considering strain-hardening effect of HSB600 high performance steel for compact composite I-girders in positive bending. Unlike conventional steels, HSB600 undergoes strain-hardening just after yielding without going through yield plateau. However, because the nominal flexural strength specified in domestic and foreign bridge design specifications has been developed for the conventional steel composite girders, the nominal flexural strength does not appropriately consider the strain-hardening of HSB600. Therefore, plastic moment considering a strain-hardening is proposed so as to consider effect of the strain-hardening of HSB600 on flexural strength and then moment-curvature analysis is performed to a wide range of cross-sections. From results of the analysis, a parameter representing the effect of the strain-hardening on the flexural strength of HSB600 composite girders is proposed. Furthermore, by using this parameter, the nominal flexural strength considering the strain-hardening effect for HSB600 composite I-girders in positive bending is proposed and then evaluated by comparing with the current AASHTO LRFD bridge design specifications.

• Applied Microscopy
• /
• v.19 no.2
• /
• pp.119-137
• /
• 1989

It has been shown in this and earlier investigation that the turtle bladder mucosa has three main cell types on their mucosal surface. They are the granular cells, ${\alpha}$ CA cells, and ${\beta}$ CA cells. The three major transport mechanisms that occurs in the turtle bladder are sodium reabsorption, proton secretion, and bicarbonate secretion. In the present work the trans-port mechanisms by bladder epithelial cells of freshwater turtle, Pseudemys scripta, are summarized as follows. 1. The granular cells play an important role in sodium transport, while the ${\alpha}$ and ${\beta}$ CA cells do not appear to play a determining role in sodium transport. 2. It appears that the active sodium transport in the granular cells occurs in two-step process, implying that first, sodium diffuses into the cells, followed by an energy-dependent efflux step, which is catalyzed by the ouabain-sensitive Na-K ATPase. 3. The ${\alpha}$ type of CA cells are responsible for the proton secretion using the proton pump on the apical plasma membrane, while the ${\beta}$ type of CA cells are believed to be responsible for bicarbonate secretion. 4. When looked at under freeze-fracture electron microscopy, the apical plasma membrane of ${\alpha}$ cells have a characteristic population of rod-shaped intramembranous particles which are believed to be components of the proton pumps. Conversely, ${\beta}$ type of CA cells show rod-shaped particles in their basolateral plasma membranes, which is consistent with the proton absorptive, bicarbonate secretory mechanism. 5. In the turtle bladder, the ${\alpha}$ and ${\beta}$ type of cells are believed to be both responsible for proton transport, but in opposite directions.