분산 시스템의 동적 파일 할당 연구

서필교(Seo Pil Kyo) 한국정보처리학회 1997 정보처리학회논문지 Vol.4 No.7

In a distributed system, the simple file allocation problem determines the placement of copies of a file, so as to minimize the operating costs. The simple file allocation problem assumes the cost parameters to be fixed. In practice, these parameters change over time. In this research, dynamic file allocation problem for both single and multiple files are considered, which account for these changing parameters. A model for dynamic file allocation problem is formulated as a mixed integer program for which Lagrangian relaxation based branch-and-bound algorithm is developed. This algorithms is implemented and its efficiency is tested on medium to large test problems.

휴대폰의 위치기반서비스와 Call Back URL SMS를 이용한 e-CRM 시스템 개발

전진호(Jin-Ho Jeon),서필교(Phil-Kyo Seo) 한국컴퓨터정보학회 2010 韓國컴퓨터情報學會論文誌 Vol.15 No.3

유비쿼터스 위치기반 서비스는 언제 어디서나 사람과 사물 같은 객체의 위치를 인식하고, 이를 기반으로 유용한 서비스를 제공하는 중요한 서비스로 대두되고 있다. 본 논문에서는 휴대폰의 위치 기반 정보(Location-Based Service)를 이용하여 사용자의 휴대단말기로 전달 받을 수 있는 차별화된 실시간 1:1 e-CRM 시스템을 구현하였다. 설계된 시스템을 통하여 적용가능한 여러가지 시나리오 중 고객이 대형 할인마트 인접 지역에 접근하였을 때 쇼핑 정보 및 할인정보를 SMS를 통해 제공하고 Call Back을 통해 할인쿠폰을 다운로드 받는 시나리오를 바탕으로 개발 및 테스트가 진행하였다. 제안된 시스템은 향 후 다양한 서비스의 이벤트를 적용함으로써 사용자의 활동 영역 따른 개인화된 차별적 실시간 마케팅 방법으로 활용이 가능할 것이다. Whenever and wherever, recognizing location of object such as human as well as things, ubiquitous Location-Based Service which provides useful service based on this are rising as an important service. In this paper, we implemented customized real time 1:1 e-CRM system that can communicate with user's mobile phone through using Location-Based Service of mobile phone. Among various scenarios that are applicable to designed system, development and test were conducted based on scenario that provides shopping information and discount information to customers through SMS as they approach to vicinity of large discount store and allow them to download discount coupons through Call Back. The suggested system will be applied to various service event and can be used as a customized real time marketing method according to user's personal activity area.

한국형 대형 할인점의 상품배치의 의사결정

주상호(Sang Ho Joo),서필교(Pil Kyo Seo) 한국유통경영학회 1999 유통경영학회지 Vol.2 No.-

The discount store we are dealing with in this study is typically located near a large scale apartment complex with high population density. In this type of discount store, we easily encounter the shopping environment in which customer movements are mixed in all directions and jammed in the aisle. This bothers the customers to shop in a comfortable and relaxed mood and, as a result, reduces the possibility of impulse purchasing. We propose a product display assignment problem in a large scale discount retailor store operation in Korea. We present a decision making model in which the product assignment is determined to minimize the customer flow congestion caused by customer movement for shopping in the display area. Due to the complexity of the problem, we propose a heuristic algorithm to obtain upper bounds on the optimum value. We also suggest a set of approaches to resolve the disorder unbalance among the groups of product display corners. We discuss the management of data base associated with the decision making problem. At the end we state the research contributions and further directions from operations management view point.

확장된 기술수용모형 (TAM)을 적용한 TV 건강 프로그램 시청의도 분석

최믿음(Mideum Choi),서필교(Pill-Kyo Seo),최명일(Myung-Il Choi),백혜진(Hye-Jin Paek) 한국언론학회 2014 한국언론학보 Vol.58 No.6

감염병 보도 지침에 따른 에볼라 바이러스 언론보도 내용분석:국내 주요 일간지를 중심으로

허용강(Heo, Yong-Kang),차수연(Cha, Soo-Yeon),서필교(Seo, Phil-Kyo),김소영(Kim, So-Young),백혜진(Paek, Hye-Jin) 한국헬스커뮤니케이션학회 2015 헬스커뮤니케이션연구 Vol.12 No.-

본 연구는 공중 보건 및 커뮤니케이션 분야에서 거의 다루지 않았던 건강위험 이슈에 대해 국내 주요언론들이 언론 보도 지침을 준수하고 있는지 알아보고자 하였다. 특히 2014년에 공중 보건 영역에서 중요한 이슈로 부각된 ‘에볼라 바이러스’를 주제로, 보건 및 헬스 분야의 전문 학 술단체인 한국헬스커뮤니케이션학회와 보건복지부 출입기자단이 협업하여 수립한 ‘감염병 보도 준칙’과 세계보건기구(WHO)의 ‘감염병 커뮤니케이션 지침’을 바탕으로 내용분석을 실시하였다. 분석 결과, 본 논문에서는 바이러스의 ‘유행’과 관련된 정보가 ‘위험의 크기’ 혹은 ‘위험의 정도’ 와 관련된 기사보다 많았고, 바이러스 ‘질병에 대한 특성’ 및 ‘감염병 관리’에 대한 정보는 상대적으로 적었다. 본 연구는 기존에 개발된 감염병 커뮤니케이션 지침이 실제 뉴스에서 잘 적용 되고 있는지를 살펴봄으로써, 보도 지침의 중요성과 더불어 지침을 준수하는 것의 중요성을 촉구하는데 있어 경험적 증거로 사용되는데 기여하고자 한다. Media play a crucial role in informing the public about an emerging infectious disease and its health risk. Thus, Korea Health Communication Association and press corps in the Ministry of Health and Welfare worked together to establish the infectious disease reporting guidelines, guided by and benchmarking World Health Organization(WHO)'s Outbreak Communication Guidelines. But little is known about the extent to which media comply to such guidelines. The purpose of this study to examine how mainstream newspapers report an emerging infectious disease comply to the guidelines in the context of Ebola Virus. A content analysis of 213 major newspaper reports indicated that reports cover individual incidents of virus infection more than the degree and magnitude of risk of Ebola Virus. The frequency of reports covering disease characteristics and control of Ebola Virus was not common. Accuracy of information on the Ebola outbreak and preventive guidelines for the public has much room for improvement. This study provides a first step to document evidence on how much media comply to the outbreak communication and reporting guidelines. The results can be used to urge the media to take more responsible reporting practices in such contexts of life-threatening events.

인터넷상거래에서 공동물류 활용 방안에 관한 연구

서필교,주상호 한국유통정보학회 2000 유통정보학회지 Vol.3 No.1

In a traditional business environment purchase ordered products are normally obtained right after they are paid, however in an Internet business environment except for the digitized products we have to wait until they are delivered to the delivery address. The delivery cost occupies a big portion of the total buying cost and the delivery time is an important factor to facilitate Internet business. When we use Internet shops, their Internet addresses are to be memorized. Each Internet shop has various ways of payment and delivery system. Meta shopping mall is a mall of malls where lots of Internet shopping malls are doing their own business. In a meta shopping mall system, an efficient logistics and distribution system can be used to minimize the total logistics and distribution costs. In this paper and 0/1 integer model and its solution procedure are proposed to minimize the total logistics and distribution cost and to meet the delivery time requirement. And also the application areas of this model is proposed.

분산 데이터베이스시스템에서 전송량 최소화를 위한 데이터파일 배치 및 경영보고서 작성위치 결정 모형

徐必敎 明知大學校 經濟硏究所 1999 경영연구 Vol.18 No.1

FILE ALLOCATION PROBLEM AT A CHANGING FILE ACCESS RATE

Seo, Pil Kyo 明知大學校 經濟硏究所 1994 경영연구 Vol.11 No.1

Relation Assignment with Join Site Selection Problem in Distributed Database Systems

Seo, Pil Kyo 明知大學校 經濟硏究所 1996 경영연구 Vol.13 No.1

분산처리환경에서 관계형 데이터베이스의 릴레이션을 분산시킬 경우 최적위치할당 결정과 관련하여 발생할 수 있는 문제는 화일할당문제(File Allocation Problem)과 질의 최적화문제(Query Optimization Problem)로 연구되어 왔다. 화일할당문제는 하나의 질의가 여러개의 파일(또는 릴레이션)을 요구할 경우 질의가 발생한 장소로 모든 화일들이 전송되어 처리된다는 가정 하에 연구되어 왔으며, 질의최적화 문제는 분산된 릴레이션 들의 질의 처리를 위해 최적 질의처리 방법, 특히 조인연산의 방법을 릴레이션의 위치는 이미 할당되어 있다는 가정하에 연구하여 왔다. 본 연구에서는 위의 두가지 문제를 동시에 해결할 수 있는 방법론에 초점을 맞추어 n-way 조인 문제를 포함한 릴레이션 할당문제를 0/1 정수계획법문제로 공식화 하였으며, Dual Ascent 형태의 문제해결 방안이 제시되고 있다.

한국형 대형 할인점의 상품배치의 의사결정

주상호,서필교 한국유통정보학회 1999 유통정보학회지 Vol.2 No.1

The discount store we are dealing with in this study is typically located near a large scale apartment complex with high population density. In this type of discount store, we easily encounter the shopping environment in which customer movements are mixed in all directions and jammed in the aisle. This bothers the customers to shop in a comfortable and relaxed mood and, as a result, reduces the possibility of impulse purchasing. We propose a product display assignment problem in a large scale discount retailor store operation in Korea. We present a decision making model in which the product assignment is determined to minimize the customer flow congestion caused by customer movement for shopping in the display area. Due to the complexity of the problem, we propose a heuristic algorithm to obtain upper bounds on the optimum value. We also suggest a set of approaches to resolve the disorder unbalance among the groups of product display corners. We discuss the management of data base associated with the decision making problem. At the end we state the research contributions and further directions from operations management view point.