• 대한전자공학회논문지TC
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• 제46권5호
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• pp.88-94
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• 2009

본 논문에서는 다중 안테나 시스템에서 신호 수신을 위한 lattice reduction (LR) 기반 복호기의 복잡도를 줄이기 위한 방법을 제안한다. ML (Maximum Likelihood) 방식이 복호 성능은 우수하지만 안테나와 성상 점의 개수에 따라 지수적으로 복잡도가 증가하는데 반해 LR 기반의 복호기는 상대적으로 적은 복잡도로 동일한 다이버시티 성능을 보이는 것으로 알려져 있다. 그러나 LR 과정도 채널 행렬의 열 벡터 교환 과정을 포함한 반복 연산에 의해서 복잡도가 높고 하드웨어 구현이 어려운 점이 있다. LR 과정은 채널 행렬이 주어지는 경우 유일하게 결정되기 때문에 이 과정을 offline으로 미리 수행하여 Look-Up Table(LUT)에 저장하는 방식으로 계산량을 줄일 수 있다. 본 논문에서는 LR 기반 수신기에서 LUT 를 효율적으로 구성하는 방법을 제시하고 성능을 비교한다. 제안된 방식을 적용할 경우 기존의 LR 방식에 비하여 적은 연산량으로 유사한 수신 성능을 보임을 모의실험을 통하여 보인다.

• 복식
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• 제67권2호
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• pp.131-146
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• 2017

The aim of this study is to investigate the operating characteristics of fashion start-up companies and the characteristics of their founders. For this purpose, this study surveyed fashion start-up companies via online survey in May 2015, and analyzed the data from one hundred companies. The results are as follows. First, for the characteristics of the founders, female founders constituted 65.0% and male founders 35.0%. At the time of establishment, founders aged 26-35 constituted 77.0%. Founders with less than five years of work experience made up about 80%. 82.1% of the founders participated in domestic and foreign exhibitions/fairs. 41.0% of the founders were awarded fashion contest and competition awards, and 33.3% of the founders were supported by rising designer support projects. Second, for the operating characteristics of the start-up companies, clothing at 78.0% was the most popular entrepreneurial item, and the majority targeted the age 20-30 group. 78.0% of the companies had less than 40 production styles per season, and all the enterprises had less than 5 employees. 59.0% of the companies had export experience. Exports to China, Hong Kong, and Japan accounted for 67.4% of all exports. Major distribution channels were mainly select shops(offline select shops 79.8%, online select shops 62.8%). The main methods of promotion were fashion media articles/interviews, product sponsorship, and SNS. The most preferred distribution channel was becoming a part of online/offline select shops(92.6%). Viral marketing(84.4%), star marketing and costume sponsorship(66.7%) were the most preferred method of promotion. The most preferred way to enter foreign markets was to participate in domestic and foreign exhibitions/fairs/trade shows. This study provides basic data necessary for future founders preparing to launch fashion start-up companies. It also aids fashion start-up companies in developing more advanced business operation strategies.

• Journal of Korea Trade
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• 제25권3호
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• pp.153-168
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• 2021

Purpose - In this study, we aim to explore new distribution strategies for sustainable growth in the era of the 4th industrial revolution, focusing on SMEs (small and medium-sized enterprises) in Korea, and suggest ways to upgrade the government's official distribution channel to the next level. Design/methodology - First of all, this paper explored the prior research, the current status of sales support for SMEs, and the changes in the distribution industry due to COVID-19 pandemic. Based on Moon (2016)'s ABCD strategic model - Agility, Benchmarking, Convergence, and Dedication, the study then derived directions in which official distribution channels should move and the new distribution strategy for Korean SMEs to secure competitive advantage. Findings - First, in terms of 'Agility', in order to upgrade official distribution channels, which are currently at some competitive disadvantages compared to private distribution companies, we must quickly introduce technologies for the 4th industrial revolution, such as AI, Big Data, etc., and establish precise strategies to strengthen the capabilities of SMEs. Second, in terms of 'Benchmarking', the use of "Chamelezones" has been increasing to enhance the competitiveness of offline stores in line with recent ontact trends. Therefore, official distribution channels should also benchmark such cases, strengthening their competitiveness by utilizing offline spaces more efficiently and effectively. Third, in terms of 'Convergence', in line with the rapidly changing trend of the times, official distribution channels should also promote active partnerships with media commerce, e-commerce and ICT platforms, as well as cooperation with private retailers, and focus on creating synergy effects through them. Finally, from the perspective of 'Dedication', digitalization should be promoted step by step, finding the sector that can accelerate digital among the value chains of official distribution channels, and continuing to discuss how to digitize it realistically. Originality/value - Based on this analysis, we have presented strategies and implications for innovating official distribution channels for SMEs, which will contribute to enhancing the competitive advantage of official distribution channels in the post COVID-19 pandemic era.

• 전자통신동향분석
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• 제37권3호
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• pp.74-84
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• 2022

The Korean mobile service market has persistently grown with the number of subscribers and volume of mobile traffic. It shows the slow diffusion of 5G subscribers, and rapid growth of both the MVNO(Mobile Virtual Network Operator) market and unlocked mobile phones. Therefore, this study derives the direction of telcos' strategies and policy implications by empirically analyzing the usage and attitude of LTE and 5G subscribers. Our major findings are as follows: First, our current mobile service subscription market constitutes most long-term customers for their incumbent carriers only by device change from lock-in with bundle services. Mobile tariffs, data speed, and benefits of bundle services are important factors affecting choices and customers' satisfaction with a provider and intentions of churning to another. Second, demand and satisfaction for using 5G are less because speeds and service tariffs act as pain points for 5G services. Third, the users' high preferences for MVNOs and unlocked mobile phones are linked to their subscription to MVNOs' low-cost plans with unlocked mobile phones on online channels. These streams lead to a big change in the market competition that MNO(Mobile Network Operator)s' market shares are expected to decrease and MVNOs' shares will be increased by two times, in the near future. Therefore, MNOs need to change their distribution strategies from offline to online channels and try to resolve the stereotype, "mobile tariffs are expensive," by enhancing their service values. Finally, as consumers prefer one-stop service in the same channel regardless of the distribution channel, policies should focus on the consumers' needs for convenience rather than on the channel separation for perfectly unlocked mobile phones.

• 복식문화연구
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• 제32권2호
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• pp.199-214
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• 2024

Until now, research on consumers' purchasing behavior has primarily focused on psychological aspects or depended on consumer surveys. However, there may be a gap between consumers' self-reported perceptions and their observable actions. In response, this study aimed to investigate consumer purchasing behavior utilizing a big data approach. To this end, this study investigated the purchasing patterns of fashion items, both online and in retail stores, from a data-driven perspective. We also investigated whether individual consumers switched between online websites and retail establishments for making purchases. Data on 516,474 purchases were obtained from fashion companies. We used association rule analysis and K-means clustering to identify purchase patterns that were influenced by customer loyalty. Furthermore, sequential pattern analysis was applied to investigate the usage patterns of online and offline channels by consumers. The results showed that high-loyalty consumers mainly purchased infrequently bought items in the brand line, as well as high-priced items, and that these purchase patterns were similar both online and in stores. In contrast, the low-loyalty group showed different purchasing behaviors for online versus in-store purchases. In physical environments, the low-loyalty consumers tended to purchase less popular or more expensive items from the brand line, whereas in online environments, their purchases centered around items with relatively high sales volumes. Finally, we found that both high and low loyalty groups exclusively used a single preferred channel, either online or in-store. The findings help companies better understand consumer purchase patterns and build future marketing strategies around items with high brand centrality.

• 대한지리학회지
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• 제48권5호
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• pp.686-708
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• 2013

본 연구는 온라인 국민참여서비스, 사이버정당, 시민사회네트워크의 발달과 운동 등으로 구분되는 다양한 사이버정치 활동이 온라인에서 어떤 특징을 보이는지, 가상공간 안에서의 정치 활동이 오프라인의 환경과 어떤 연관성이 있는지 알아보는 것에 목표가 있다. 이를 위해 2012년 대통령 선거에서 사이버정치 활동을 했던 32명의 20대를 중심으로 연구를 수행하였고, 그 결과는 다음과 같다. 첫째, 가장 일반적인 사이버정치의 형태인 온라인 국민참여서비스의 경우, 온 오프라인에서 모두 정보의 탐색 및 획득은 누구나 쉽게 접근이 가능하고, 열려 있는 장소에서 일어나며, 정보의 창출과 재구조화는 안정감과 보호받고 있다는 느낌이 있는 닫혀 있고 지극히 개인적인 곳에서 이루어지고 있다. 둘째, 우리나라의 사이버정당은 가교공간으로 활용할 수 있는 충분한 여건을 갖추고 있음에도 불구하고 그 기능을 수행하지 못하나, 즉각 형성 소멸되는 즉시적 사회공간을 창출하는 데 부분적으로나마 공헌하고 있는 것으로 나타났다. 마지막으로 시민사회네트워크의 발달과 운동을 통해 형성된 온라인 관계는 정치적 성향과 관심에 따라 분절되며, 이는 오프라인에서의 네트워크와 주요 활동장소의 선택에까지 영향을 미친다.

• 한국빅데이터학회지
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• 제8권1호
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• pp.131-156
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• 2023

전통적인 오프라인 중심의 상거래 방식은 온라인과 모바일 기술의 발전으로 인해 크게 변화하고 있으며, 이러한 변화는 구매 패턴에 관한 소비자 행동의 변화를 동반했다. 온라인 쇼핑의 성장에도 불구하고 몽골에는 여전히 '가공식품'과 같은 특정 제품군에서는 전통적인 오프라인 매장을 더욱 선호하고 있다. 이러한 온라인과 오프라인 채널의 공존과 기능 변화에 대응하기 위해서는 기존 채널에 대한 성과를 면밀히 분석해야 한다. 특히, 채널의 역할 전환 혹은 통합과 같은 새로운 전략을 수립할 필요가 있다. 이에 본 연구에서는 몽골 유통 시장을 중심으로 오프라인 매장에 대한 매출, 이익, 판매량과 같은 성과 지표를 기준으로 군집분석을 실시하였으며, 각 군집의 특징을 주변환경과 비교하여 주요 특징을 발견하였다. 주요 군집에 속한 오프라인 매장의 성과 향상을 위해 온-오프라인 채널 간의 풀필먼트 허브 매장, 고객의 매장 체류 시간을 늘리기 위한 체험 매장, 그리고 매장 특성에 따라 서로 보완하여 트래픽을 증가시킬 수 있는 비관련 채널 간의 합병 등 세 가지 전략을 제안하였다. 이를 통해, 기존 유통 채널의 다변화와 함께 고객 경험 향상 및 수익성 개선을 달성할 수 있을 것이다.

• 대한의용생체공학회:의공학회지
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• 제28권2호
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• pp.258-264
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• 2007

Spatiotemporal changes of brain rhythmic activity at a certain frequency have been usually monitored in real time using scalp potential maps of multi-channel electroencephalography(EEG) or magnetic field maps of magnetoencephalography(MEG). In the present study, we investigate if it is possible to implement a real-time brain activity monitoring system which can monitor spatiotemporal changes of cortical rhythmic activity on a subject's cortical surface, neither on a sensor plane nor on a standard brain model, with a high temporal resolution. In the suggested system, a frequency domain inverse operator is preliminarily constructed, considering the individual subject's anatomical information, noise level, and sensor configurations. Spectral current power at each cortical vertex is then calculated for the Fourier transforms of successive sections of continuous data, when a single frequency or particular frequency band is given. An offline study which perfectly simulated the suggested system demonstrates that cortical rhythmic source changes can be monitored at the cortical level with a maximal delay time of about 200 ms, when 18 channel EEG data are analyzed under Pentium4 3.4GHz environment. Two sets of artifact-free, eye closed, resting EEG data acquired from a dementia patient and a normal male subject were used to show the feasibility of the suggested system. Factors influencing the computational delay are investigated and possible applications of the system are discussed as well.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2003년도 추계학술대회 논문집
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• pp.336-339
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• 2003

A digital data logging system has been developed for the purpose of a compact offline Ocean Bottom Seismometer(OBS). The Digital Data Logger(DDL) consists of A/D system, Micom with storage memory and firmware managing data files. The A/D system acquires data of 16bit/4ch with sampling rate of 250Hz per channel. The Micom, a micro controller board with T33521 processor of 8051 class, was equipped with 8 flash memories of 128MB for data storage capacity of 1GB. The firmware stores the acquiring data in form of binary files. The DDL was designated to be compact and light and to consume low energy as possible. The DDL is to interface with PC through USB(Universal Serial Bus). The performance of the DDL has been validated through tests with respect to a 3-axis seismometer.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 2006년도 추계학술대회
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• pp.3-16
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• 2006

In the age where the Internet changes everything, even the earth has become flat. The boarders between nations, locations, times, and industries are not maningful, and no single company can do the whole process well. Therefore, various types of 'Value network' and 'Relation web' emerge for moving first and fast learning. Bort the relationship maturity model (RMM) proposed and the partnership management initiatives at SKT demonstrate that the concept is important, and that the final goal can be reached only through a series of critical outcome at each phase. In particular, recognizing as core infrastructures various online/offline channels, deep trust, and rich communications is an important finding for a successful relationship management. Also, related literatures suggest the following key factors to be influential in more that two phases: professionalism including expertise, similarity, channel capacity. Based on these findings, future efforts need to be put on the research & development of related measurement and management tools. We do hope more people dance with their partners through these efforts.