• The Journal of the Korea institute of electronic communication sciences
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• v.15 no.5
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• pp.981-986
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• 2020

The Internet of Things refers to a space-of-things connection network configured to allow things with built-in sensors and communication functions to interact with people and other things, regardless of the restriction of place or time.IoT is a network developed for the purpose of services for human convenience, but the scope of its use is expanding across industries such as power transmission, energy management, and factory automation. However, the communication protocol of IoT, MQTT, is a lightweight message transmission protocol based on the push technology and has a security vulnerability, and this suggests that there are risks such as personal information infringement or industrial information leakage. To solve this problem, we designed a synchronous MQTT security channel that creates a secure channel by using the characteristic that different chaotic dynamical systems are synchronized with arbitrary values in the lightweight message transmission MQTT protocol. The communication channel we designed is a method of transmitting information to the noise channel by using characteristics such as random number similarity of chaotic signals, sensitivity to initial value, and reproducibility of signals. The encryption method synchronized with the proposed key value is a method optimized for the lightweight message transmission protocol, and if applied to the MQTT of IoT, it is believed to be effective in creating a secure channel.

• Information Systems Review
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• v.4 no.1
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• pp.33-45
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• 2002

With the advance of information technology, it is possible to build the interactive communication channel among relationship participants with low cost, and this channel makes ties between consumers and company by enabling information sharing and exchange. In order to maintain customer relationship, it is necessary to support customer information that includes of-the-customer, for-the-customer, and by-the-customer information. From the three types of customer information, the proper information for the relationship management like the level and type of commitment can be extracted. Customer Information System (CIS), which includes database, communication channel, application program, should be designed to facilitate the customer relationship management. Since lots of investments to information system are required, it is not easy to implement. This paper develops a framework of dynamic customer relationship management and suggests an effective information technology strategy to support that.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2002.05a
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• pp.750-754
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• 2002

현대 기업 경영환경의 가장 큰 변화는 개개의 기업들이 기업전체의 효율성과 이익의 향상을 위해서 공급망 (Supply Chain)에 대하여 많은 관심을 기울이기 시작했다는 것이다. 여기서 공급망이란 원료의 조달부터, 중간재로의 가공 및 유통, 최종제품의 생산 및 배송까지의 기능을 수행하기 위한 설비와 유통 채널의 네트워크를 말하며, 모든 기업들은 원자재에서 최종소비자의 형태로 공급망에 참여한다, 결국 공급망의 형태는 산업과 기업에 따라서 매우 복잡하고 다양할 수밖에 없는데, 원재료의 수급에서 고객에게 제품을 전달하는 자원과 정보등 일련의 흐름전체를 경쟁력 있는 업무의 흐름으로 관리하려는 관리 시스템이 공급망 관리(SCM :Supply Chain Management )인 것이다. 기업들의 공급망 관리에 대한 관심이 증대하는 반면에 고객 수요패턴의 불확실성이나 급변하는 기업환경 등 여러 외부 입력 값들의 변화에 따라 효율적인 공급망 구성을 위한 연구는 부족한 실정이다. 이러한 문제를 해결하기 위해 최근 시뮬레이션을 적용한 공급망 시뮬레이터(SCS : Supply Chain Simulator )에 많은 관심이 집중되고 있다. 본 연구에서는 SCS 의 일종인 Arena Professional Edition과 공급망 관리의 성과를 측정하고 개선분야를 직접적으로 파악할 수 있는 SCOR (Supply Chain Operations Reference Model)을 이용하여 제조기업의 효율적인 SCM 의사결정에 대해서 알아보고자 한다.

• Journal of Global Scholars of Marketing Science
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• v.18 no.3
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• pp.1-25
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• 2008

Ⅰ. Introduction Retailers in the 21st century are being told that future retailers are those who can execute seamless multi-channel access. The reason is that retailers should be where shoppers want them, when they want them anytime, anywhere and in multiple formats. Multi-channel access is considered one of the top 10 trends of all business in the next decade (Patricia T. Warrington, et al., 2007) And most firms use both direct and indirect channels in their markets. Given this trend, we need to evaluate a channel equity more systematically than before as this issue is expected to get more attention to consumers as well as to brand managers. Consumers are becoming very much confused concerning the choice of place where they shop for durable goods as there are at least 6-7 retail options. On the other hand, manufacturers have to deal with category killers, their dealers network, Internet shopping malls, and other avenue of distribution channels and they hope their retail channel behave like extensions of their own companies. They would like their products to be foremost in the retailer's mind-the first to be proposed and effectively communicated to potential customers. To enable this hope to come reality, they should know each channel's advantages and disadvantages from consumer perspectives. In addition, customer satisfaction is the key determinant of retail customer loyalty. However, there are only a few researches regarding the effects of shopping satisfaction and perceptions on consumers' channel choices and channels. The purpose of this study was to assess Korean consumers' channel choice and satisfaction towards channels they prefer to use in the case of electronic goods shopping. Korean electronic goods retail market is one of good example of multi-channel shopping environments. As the Korea retail market has been undergoing significant structural changes since it had opened to global retailers in 1996, new formats such as hypermarkets, Internet shopping malls and category killers have arrived for the last decade. Korean electronic goods shoppers have seven major channels : (1)category killers (2) hypermarket (3) manufacturer dealer shop (4) Internet shopping malls (5) department store (6) TV home-shopping (7) speciality shopping arcade. Korean retail sector has been modernized with amazing speed for the last decade. Overall summary of major retail channels is as follows: Hypermarket has been number 1 retailer type in sales volume from 2003 ; non-store retailing has been number 2 from 2007 ; department store is now number 3 ; small scale category killers are growing rapidly in the area of electronics and office products in particular. We try to evaluate each channel's equity using a consumer survey. The survey was done by telephone interview with 1000 housewife who lives nationwide. Sampling was done according to 2005 national census and average interview time was 10 to 15 minutes. Ⅱ. Research Summary We have found that seven major retail channels compete with each other within Korean consumers' minds in terms of price and service. Each channel seem to have its unique selling points. Department stores were perceived as the best electronic goods shopping destinations due to after service. Internet shopping malls were perceived as the convenient channel owing to price checking. Category killers and hypermarkets were more attractive in both price merits and location conveniences. On the other hand, manufacturers dealer networks were pulling customers mainly by location and after service. Category killers and hypermarkets were most beloved retail channel for Korean consumers. However category killers compete mainly with department stores and shopping arcades while hypermarkets tend to compete with Internet and TV home shopping channels. Regarding channel satisfaction, the top 3 channels were service-driven retailers: department stores (4.27); dealer shop (4.21); and Internet shopping malls (4.21). Speciality shopping arcade(3.98) were the least satisfied channels among Korean consumers. Ⅲ. Implications We try to identify the whole picture of multi-channel retail shopping environments and its implications in the context of Korean electronic goods. From manufacturers' perspectives, multi-channel may cause channel conflicts. Furthermore, inter-channel competition draws much more attention as hypermarkets and category killers have grown rapidly in recent years. At the same time, from consumers' perspectives, 'buy where' is becoming an important buying decision as it would decide the level of shopping satisfaction. We need to develop the concept of 'channel equity' to manage multi-channel distribution effectively. Firms should measure and monitor their prime channel equity in regular basis to maximize their channel potentials. Prototype channel equity positioning map has been developed as follows. We expect more studies to develop the concept of 'channel equity' in the future.

• Broadcasting and Media Magazine
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• v.2 no.1
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• pp.65-72
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• 1997

디지털 위성 방송 서비스의 시작으로 방송 사업자는 다채널 및 전문 채널의 활성화로 유료 방송 서비스에 많은 관심을 가지고 있다. 본 논문에서는 이 유료 방송 서비스의 송신 및 수신 시스템의 구조에 대해 언급하고 특히 선 지불 메커니즘을 따르는 유료 방송을 위해서 스마트 카드가 어떠한 관리 기능을 포함하여야 하는지를 기술하고, 그에 따른 선지불 기능 수행 과정을 송신측과 수신측으로 나뉘어 설명하여 선지불/후지불 메커니즘 각각의 장단점에 대해 논한다.

• Broadcasting and Media Magazine
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• v.2 no.1
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• pp.66-71
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• 1997

디지털 위성 방송 서비스의 시작으로 방송 사업자는 다채널 및 전문 채널의 활성화로 류료 방송 서비스에 많은 관심을 가지고 있다. 본 논문에서는 이 유료 방송 서비스의 송신 및 수신 시스템의 구조에 대해 언급하고 특히 선 지불 메커니즘을 따르는 유료 방송을 위해서 스마트 카드가 어떠한 관리기능을 포함하여야 하는지를 기술하고, 그에 따른 선 지불 기능 수행 과정을 송신측과 수신축으로 나뉘어 설명하여 선지불/후지불 메커니즘 각각의 장단점에 대해 논한다.

• 제어로봇시스템학회:학술대회논문집
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• 1986.10a
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• pp.471-473
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• 1986

맥주 제조 공정은 다음과 같이 이루어 진다. 담금공정-발효공정-저장공정-여과공정-제품공정, 이중 발효 및 저장 공정은 미생물이 관여하므로 균체의 생육과 제품 생산과의 관계등이 아주 예민하고 복잡하므르 Computer에 의한 자동 계측 및 제어는 효과적인 공정관리 수단이 되며, 또한 품질 향상과 균일화를 기대 할 수 있다. 이에 발효 및 저장조의 128 채널의 공정치 On-line monitoring, graphic display, disk 저장, 프린터로의 reporting 및 제어를 위한 hardware system 구성과 software를 개발하였다.

• Proceedings of the IEEK Conference
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• 2003.07a
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• pp.61-64
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• 2003

GPRS is designed for transmitting packet data and supposed to take its radio resource form the pool of channels unused by GSM voice services. In this paper, The GPRS and GSM circuit switched services share the same radio resource. Whenever a channel is not used by circuit switched services, it may be utilized by GPRS. In this paper, the main aim is performance and comparison resource management policies with channel de-allocation in GPRS network. Three resource management policies is voice priority, R-reservation, dynamic reservation.

• Review of KIISC
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• v.11 no.4
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• pp.44-60
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• 2001

거래를 포함한 커뮤니케이션이 효율적으로 발전함에 따라 보다 다양한 채널의 커뮤니케이션이 가능해졌으나, 신뢰 메커니즘이 아직 형성되지 못하여 불확실성과 위험 요소를 야기시킬 수 있기 때문에 정보 사회에서의 신뢰성에 대한 문제는 점점 중요한 의미를 갖게 되었다. 정보사회에서 신뢰를 형성하는 방법은 매우 다양하다. 기존에는 이용자의 경험 및 타인으로부터의 정보입수, 공급자의 신용 및 명성, 정부의 법·제도 등을 토대로 신뢰형성이 이루어져 왔으나, 정보사회에서는 전자서명이라는 새로운 기술과 이러한 기술을 사회적으로 이용가능하게 하는 인증 관리 체계의 도입을 토대로 이루어지고 있다. 본 고에서는 전자서명과 인증제도의 국내·외적인 동향에 대해 분석하고자 한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2001.05a
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• pp.409-424
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• 2001

미국 디지털 유선방송 표준인 OpenCable 방식을 디지털유선방송 추진위원회에서 만장일치로 선정하여 정보통신부에 권고한 상태, 기술기준 정리 및 데이터 방송, Text Bed 관리 등의 업무를 추진위원호에서 수행할 예정임. 디지털 유선방송은 전송방식이 256QAM이 표준이므로, 최대 6MHz 대역내 다수의 HDTV 채널 수용이 가능할 것임. STB내에 OCAP Middleware가 탑재될 것이고 Web Browsing, Chatting, Email 등이 표준으로 되어 있고 양방향 데이터방송이 가능하므로, 현재의 단순한 방송위주의 유선방송에서 본격적인 방송 통신의 융합체로 새롭게 탄생할 것으로 예상됨