스마트시티를 위한 시맨틱 서비스 디스커버리 시스템

윤창호 ( Chang Ho Yun ),박종원 ( Jong Won Park ),정혜선 ( Hae Sun Jung ),이용우 ( Yong Woo Lee ) 한국정보처리학회 2017 정보처리학회논문지. 컴퓨터 및 통신시스템 Vol.6 No.6

In Smart-cities, various types of integrated services must be linked to provide services to applications. Therefore, flexibility must be ensured between services so that various services can be efficiently provided. In order to secure the flexibility among services, it is very important to have a function to dynamically discover and invoke a desired service by searching for a semantic service by reflecting a recognized context through real-time context-aware in smart-cities. To date, quite a number of semantic service discovery techniques have been developed. However, they have not been verified as suitable for use in the smart-city domain. In this study, we tried to verify the existing ones to use a suitable one. We tested most of existing semantic service discovery techniques, but we found that none of them is suitable to our research. Therefore, we developed our own semantic service discovery technique. This paper introduces our work and presents the performance evaluation results that demonstrate that our developed works well and show good performance. For the performance evaluation, the experimental system was actually constructed and the real performance was measured. In the experiment, we implemented the semantic service discovery scenario that dynamically searches and calls the services needed to provide fire accident management services in smart cities.

스트림-리즈닝을 위한 실시간 사물인터넷 빅-데이터 처리^☆

윤창호 ( Chang Ho Yun ),박종원 ( Jong Won Park ),정혜선 ( Hae Sun Jung ),이용우 ( Yong Woo Lee ) 한국인터넷정보학회 2017 인터넷정보학회논문지 Vol.18 No.3

스마트-시티는 스마트-시티의 사물인터넷(Internet of Things: IoT) 디바이스를 비롯한 수많은 인프라를 지능적으로 관리하고, 다양한 스마트 어플리케이션을 도시민에게 제공한다. 스마트-시티에서는 스마트-시티 어플리케이션에서 필요한 다양한 정보를 제공하기 위하여 수많은 사물인터넷 기기들로부터 끊임없이 발생하는 대규모의 스트림 빅-데이터를 지능적으로 처리하는 기능이 필요하다. 하지만, 스마트-시티에서 대규모의 스트림 빅-데이터를 처리하는 것에는 실시간 처리와 관련된 제약들이 존재한다. 본 스마트-시티-사업단에서는 선행 연구에서 스마트-시티미들웨어와 이를 이용한 스트림-리즈닝 방법론 및 시스템을 개발하였다. 스마트-시티에서 스마트서비스를 제공하기 위하여, 스마트-시티-사업단에서는 스트림-리즈닝을 사용하는 방법론을 사용한다. 이 스트림-리즈닝은 대용량 데이터의 실시간 처리를 필요로 한다. 따라서, 후속연구로서 스마트-시티미들웨어의 클라우드-컴퓨팅 플랫폼을 이용하여 스트림-리즈닝을 위한 실시간 분산병렬처리 클라우드-컴퓨팅 방법론과 시스템을 개발하였다. 본 논문에서는 스마트-시티에서 발생하는 사물인터넷빅-데이터를 스트림-리즈닝에 사용하기 위하여 이 후속연구에서 개발된 클라우드 기반 실시간 분산병렬처리 연구결과를 소개한다. 스마트-시티의 각종 센서들로부터 전송되어지는 사물인터넷 빅-데이터를 사용하여 스트림-리즈닝하는 데 필요한 클라우드-컴퓨팅 기반의 실시간 분산처리 방법론과 시스템을 소개하고 있으며, 이 방법론을 선행연구에서 개발한 스마트-시티 미들웨어에 구현하여 실시간 분산처리 성능을 평가한 것을 소개한다. Smart Cities intelligently manage numerous infrastructures, including Smart-City IoT devices, and provide a variety of smart-city applications to citizen. In order to provide various information needed for smart-city applications, Smart Cities require a function to intelligently process large-scale streamed big data that are constantly generated from a large number of IoT devices. To provide smart services in Smart-City, the Smart-City Consortium uses stream reasoning. Our stream reasoning requires real-time processing of big data. However, there are limitations associated with real-time processing of large-scale streamed big data in Smart Cities. In this paper, we introduce one of our researches on cloud computing based real-time distributed-parallel-processing to be used in stream-reasoning of IoT big data in Smart Cities. The Smart-City Consortium introduced its previously developed smart-city middleware. In the research for this paper, we made cloud computing based real-time distributed-parallel-processing available in the cloud computing platform of the smart-city middleware developed in the previous research, so that we can perform real-time distributed-parallel-processing with them. This paper introduces a real-time distributed-parallel-processing method and system for stream reasoning with IoT big data transmitted from various sensors of Smart Cities and evaluate the performance of real-time distributed-parallel-processing of the system where the method is implemented.

초등학교 체육수업에서의 과제제시 형태분석

윤창호(Chang Ho Yun),조순묵(Soon Mook Cho) 한국스포츠교육학회 1998 한국스포츠교육학회지 Vol.5 No.2

선박용 애드혹 네트워크를 위한 Ship Ad-hoc Communication 프로토콜

윤창호,김승근,박종원,임용곤,Yun, Chang-Ho,Kim, Seung-Gun,Park, Jong-Won,Lim, Yong-Kon 한국정보통신학회 2012 한국정보통신학회논문지 Vol.16 No.5

Ship Ad-hoc Network (SANET)은 고비용의 위성 통신을 대체하여 선박에 멀티미디어 서비스를 제공하기 위한 선박 간 애드혹 네트워크이다. 현재 SANET의 물리계층은 해상 VHF 대역 디지털 통신의 표준인 ITU-R M. 1842-1을 반영할 수 있으나, 상위 계층은 명확한 표준화가 진행되지 않고 있다. 본 논문에서는 육상 애드혹 네트워크에 적용되는 매체접속제어와 라우팅 프로토콜을 기반으로, 해상 통신환경에 맞는 SANET용 네트워크 프로토콜인 Ship Ad-hoc Communication (SAC) 프로토콜을 제안한다. SAC 프로토콜은 매체접속제어와 라우팅을 하나의 알고리즘에서 수행하는 크로스 레이어 프로토콜로써, 이웃 선박의 유무, 목적지까지의 경로 설정 여부, 열악한 통신 환경 시 통신 모드 전환 등을 다양한 해상 환경을 반영한다. A ship ad-hoc network (SANET) can provide ships with diverse multimedia services by replacing expensive satellite communications. While ITU-R M. 1842-1, standards for maritime VHF band digital communications, can be used as the specifications of physical layer for SANETs, no standards are specified for higher layers of SANETs. In this paper, we propose a ship ad-hoc communication (SAC) protocol for SANETs, based on medium access control (MAC) and routing protocols for terrestrial ad-hoc networks. SAC protocol is a cross-layer protocol which combines MAC and routing into one algorithm and considers maritime environments, including the existence of neighboring ships, the possibility of routing to a destination, and changing the communication mode in case of VHF channel failure.

얼음과 파라핀 왁스 코팅 표면의 마찰

윤창호(Chang-ho Yun),김동조(Dong-jo Kim),김호영(Ho-Young Kim) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11

A thin wax layer on ski and snow board plates plays an important role in reduction of ice friction. To investigate an optimal technique for wax deposition on the plates, we consider the surface roughness and thickness of the wax layer as major parameters. The friction between the coated wax and ice is evaluated on a pin-on-disc tribometer over a wide range of sliding velocities (from 0.01 to 10 ㎧) and temperature (from -10℃ to -1.5℃). It is found that friction coefficient decreases with decreasing the thickness of the wax layer due to apparent hardness of the surface. The friction coefficient decreases with increasing the surface roughness at lower velocities for all temperature conditions. However, the friction coefficient is independent of the surface roughness at high velocities due to high wear rate of the wax layer.

반도체의 수요특성과 미ㆍ일의 정책

윤창호,Yun, Chang-Ho 한국전자정보통신산업진흥회 1986 電子振興 Vol.6 No.10

Bariatric surgery would be a primary solution to the sleep apnea?

Chang Ho Yun(윤창호) 대한외과학회 2014 대한외과학회 학술대회 초록집 Vol.2014 No.11

열병합 발전 배열을 이용한 지역냉방의 온실가스 저감효과 분석

윤창호(Chang Ho Yun),강병하(Byung Ha Kang),김석현(Sukhyun Kim) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6

욕지도 외해가두리 양식장의 참다랑어(Thunnus orientalis) 양식 사업성 비교분석

윤창호(Chang-Ho YUN),홍석남(Seok-Nam Hong),정관식(Gwan-Sik JEONG) 한국수산해양교육학회 2022 水産海洋敎育硏究 Vol.34 No.3

This study aimed to analyze the feasibility of T. orientalis offshore aquaculture production performance in Yokjido located in Tongyeong, Korea. Based on the collected biological, costs and market price data, the results indicated that under the same conditions of analyzing economic feasibility. At the social discount rate of 4.5% applied to public corporations and quasi-governmental organizations, 2,000 caught and imported T. orientalis were sold at a survival rate of 60%, respectively, at an individual weight of 30 kg to KRW 40,000/kg, thereby the financial feasibility of T. orientalis offshore cage culture was analyzed. The net present value (NPV) of caught bluefin tuna was 1,858,952 thousand won, and the corresponding internal rate of return (IRR) was 17.6%. In the case of imported, the net present value (NPV) was -1,157,227 thousand won, and the corresponding internal rate of return (IRR) was -4.2%. As a result of estimating the net present value (NPV) and internal rate of return (IRR) using the cash flows (including depreciation) generated for 10 years in units of the business period (1year). For the caught juvenile, NPV showed a positive value and IRR exceeded the social discount rate of 4.5%. On the other hand, in the case of imported, NPV had a negative value and IRR was less than 4.5% of the social discount rate. Therefore, it was found that there is a business possibility to cultivate T. orientalis with juvenile caught at the offshore farm in Yokjido has business potential.

인간 너머 지리교육을 위한 방향 모색 : 동물지리를 중심으로

윤창호(Yun, Chang-ho),임은진(Lim, Eun-jin) 한국사회과교육연구학회 2022 사회과교육 Vol.61 No.3