• Journal of the Institute of Electronics and Information Engineers
• /
• v.49 no.11
• /
• pp.211-216
• /
• 2012

Such as disaster rescue in deep water, undersea exploration and monitering for environmental pollution, many applications require the acoustic communication for high data rate over underwater acoustic channel. As underwater channel is very complex and is time-varying, In this paper, The proposed OFDM system with synchronization errors and multipath delay spread is analyzed for high data rate and reliability and rubust service over UWA channels.

• Proceedings of the Korea Contents Association Conference
• /
• 2005.11a
• /
• pp.115-118
• /
• 2005

Leakage of waterworks pipe line net cause loss of water resources, additional foundation of pressurization facilities from pressure loss and soil weakening near leaked pipe line, etc. This is difficult to maintain and manage waterworks pipe line net and to cause serious economic loss. Rate of accounted water is better by monitoring always water pressure and flux, etc. from isolated region, positively dealing with leakage accident and preventing leakage from occurring. Actually after isolating region, average rate of accounted water in this region is 88.94% by continuously monitering control of water pressure and inflow rate. It is about 9.44% more than that of Busan metropolitan city in 2003, 79.5%.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2003.10a
• /
• pp.90-94
• /
• 2003

For the structure of VMS is required to the maritime MDT for realtime acquisition the position reporting of navigating ships. The first study is the recording method a navigating data by GPS, the 2th is SSB modem for data trans-receiver by use ship. And then the communication protocol of automatic traffic for in continues transmission a ship's ID, time and position data of GPS. In this paper have studied the SSB modem for transmission the voice and data at same time. Which is adapted to the communication control unit, protocol of data traffic and acquisition, displayer of character data. This maritime GPS MDT is considered to low-cost type by using microprocessor.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2003.10a
• /
• pp.81-85
• /
• 2003

For the structure of VMS by converting on digital the position reporting of departure fishery ship in the fishery communication that be required the management ＆ operation of information in organizational. In particular, Must be made the regional ＆ concentrational of the position reporting information. The division of region is considered to the circumstance of radio wave, fishing area, quantity of fishery ship and communication traffic etc., which is capable to the DB of VMS by be concentrated in oeadquarters, which is acquisition the position reporting information of respective region. In this study have designed for building of fishery information network and automatic transmission of the position reporting information from a fishery ship.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.16 no.3
• /
• pp.391-398
• /
• 2012

Detecting races is important for debugging shared-memory parallel programs, because the races result in unintended non-deterministic executions of the programs. Previous on-the-fly techniques to detect races in parallel programs with general inter-thread coordination show serious space overhead which depends on the maximum parallelism of the program. Therefore, this paper presents a loop splitting technique for on-the-fly race detection of parallel programs which is more efficient in space complexity than previous techniques. This loop splitting technique is the debugged program which preserves semantics of the original program. Monitering loop splitting program in on-the-fly can detect first races.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2011.05a
• /
• pp.113-117
• /
• 2011

"환경과 개발"을 함께 고려하는 지속 가능한 유역관리제도 정착을 위해 도입된 수질오염총량관리제도(TMDL)가 총 8년(1차: 2004~2010년, 2차: 2011~2015년)이라는 세월이 흘렀다. 또한 이 제도의 효율적인 추진을 위해 낙동강수계 총 41개 단위유역별 모니터링 사업(유량 및 수질조사)이 지속적으로 수행되고 있다. 이와 더불어 단위유역 내 지자체간 오염배출부하 기여도 분석을 위해 각 소하천들 중 주요 시 군 경계 소하천 유역 46개 지점을 선정하여 신규 소하천 모니터링 사업을 2010년 9월부터 수행하고 있다. 소하천 모니터링 사업의 목적은 오염총량관리 단위유역 내 시 군 경계 지점에 대하여 모니터링(유량 및 수질)을 효율적으로 실시하여 소유역내 유량/수질의 변화추세를 파악하고 오염총량관리제 기본 시행계획 수립 및 이행평가 등을 위한 기초 자료 제공 및 활용에 그 목적을 두고 있다. 본 연구는 2010년에 낙동강수계 소하천 모니터링 사업에서 수행된 소유역 분석결과 및 유량/수질 측정성과에 대한 평가 및 소하천별 수질오염현황에 대해 소개하고자 한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2013.05a
• /
• pp.536-537
• /
• 2013

현재 스마트폰(Smart phone) 및 테블릿 PC의 시장이 급속하게 성장함에 따라 현실 생활에 많은 변화가 일어나고 있으며 다양한 제품을 생산하는 생산 현장에서도 새로운 유형의 스마트모니터링 시스템의 도입이 가속화 되고 있다. 뿐만 아니라 테블릿 PC 시장의 급성장으로 인하여 기존의 사무실에서 관리하던 원격 모니터링 시스템이 급속도로 모바일 기능이 탑제된 스마트모니터링 시스템으로 발전해 나가고 있다. 본 논문에서는 갤럭시탭을 기반으로 다양한 품목을 생산하는 제조현장의 생산검사항목을 대상으로 하여 스마트디바이스(갤럭시탭)를 통하여 스마트디바이스에서 획득한 이미지(image) 정보과 텍스트(text) 정보를 원적지로 전송할 수 있는 기능과 또 다른 원격지에 모니터링 할 수 있는 스마트모니터링 시스템을 개발하여 모바일 스마트기기의 활용도를 높이고 보다 유연성이 있는 스마트모니터링 시스템을 제시하고자 한다.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.37 no.7A
• /
• pp.528-534
• /
• 2012

In order to achieve high capacity and reliable link quality of the overlay convergent networks with the cognitive networking based on the advanced capability of the mobile terminal, a Distributed Wireless Communication System (DWCS) can provide the capability of enhancing the link quality. This paper has considered virtual cell: the Dual Virtual Cell (DVC), and also proposes DVC employment strategy based on radio resource monitering. The considered system constructs DVC for multi-user high-rate data transmission, and the DWCS system exploits space-time trellis codes i.e., STTC to improve a spectral efficiency. The effects of imperfect CSI(channel state information) on the system performance has also been investigated.

• Journal of Korean Society for Atmospheric Environment
• /
• v.21 no.3
• /
• pp.377-397
• /
• 2005

A new box model is proposed to describe the dynamic trend of the spatially averaged concentrations of pollutants over a large urban area such as metropolitan Seoul. Being averaged temporally and spatially over a thresh-hold scales, the dynamics of the pollutant concentration becomes simple enough that the governing equation can be expressed in an explicit algebraic form as a function of several meteorological factors and the pollutant emission rate. The single most important meteorological factor is the wind speed dominating the daily variations of the pollutant concentrations. Given the meteorological data from the surface station in the metropolitan Seoul, the model concentration shows excellent agreement with observations from January 1, 1990 to December 31, 2000: the modeling uncertainty, for example, of $NO_2$ concentrations, defined as mean differences between the model concentrations and observations is $16\%$ of the model concentrations. Even for $PM_{10}$ of which secondary sources are considered to be very important and simple box model is irrelevant to, the model performance turns out good, modeling uncertainty being about $32\%$.

• Journal of Environmental Impact Assessment
• /
• v.18 no.6
• /
• pp.401-409
• /
• 2009

Multivariate statistical approaches to classify sampling sites with measuring their similarity by water quality data and understand the characteristics of classified clusters have been discussed for the optimal water quality monitering network. For empirical study, data of two years (2005, 2006) at the 9 sampling sites with the combination of 2 depth levels and 7 important variables related to water quality is collected in Yongdam reservoir. The similarity among sampling sites is measured with Euclidean distances of water quality related variables and they are classified by hierarchical clustering method. The clustered sites are discussed with principal component variables in the view of the geographical characteristics of them and reducing the number of measuring sites. Nine sampling sites are clustered as follows; One cluster of 5, 6, and 7 sampling sites shows the characteristic of low water depth and main stream of water. The sites of 2 and 4 are clustered into the same group by characteristics of hydraulics which come from that of main stream. But their changing pattern of water quality looks like different since the site of 2 is near to dam. The sampling sites of 3, 8, and 9 are individually positioned due to the different tributary.