• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2012년도 춘계학술발표대회
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• pp.942-945
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• 2012

스마트 그리스 환경이 구축되어 고객과 전력회사 간 양방향 서비스가 가능하게 되면 전력회사는 고객에게 IHD나 ESP를 통해 여러 전력 서비스를 제공할 수 있게 된다. 더불어 다양한 third party 서비스 업체들도 고객의 정보를 이용한 부가 가치 사업을 개발하여 서비스하게 될 텐데 이 경우 AMI 망을 통한 안전한 정보 공유를 위해 전력망에 대한 보안 정책이 필요하게 된다. 본 논문에서는 국내 실정에 맞는 AMI 기술 개발 및 안전한 운영을 위해 AMI 보안에 관하여 기본적인 요구사항을 분석하고 보안 기능을 설계한다.

• International journal of advanced smart convergence
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• 제12권1호
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• pp.9-17
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• 2023

Recently, IoT technology has been widely used in many industries. Also research on integrating IoT technology with IoT sensors is actively underway. One of the important challenges in IoT is to support low-latency communication. With the development of communication networks and protocols, a variety of protocols are being used, and their performance is improving. In this paper, we compare the performance and analyze the characteristics of some of the major communication protocols in IoT application, namely MQTT, HTTP, and HTTPS. IoT sensors acquired data by connecting an Arduino equipped with ESP8266 and a temperature and humidity sensor (DHT11). The server measured the performance by building servers for each protocol using AWS EC2. We analyzed the packets transmitted between the Arduino and the server during the data transmission. We measured the amount of data and transfer time. The measurement results showed that MQTT had the lowest data transmission time and data amount among the three protocols.

• 한국안전학회지
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• 제9권4호
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• pp.132-136
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• 1994

The new spray system is proposed by using a pipe with hygroscopic needle electrode In order to develop an air-cleaning ESP with high collection efficiency for submicron particles and high removal efficiency for NOx, SO$_2$, NH$_3$. Fundamental characteristics of charging water spray, which is not an usual wet type, are investigated experimentally. As a result, corona discharging mode and ozone generation rate are significantly affected by the operational conditions, such as the applied voltage and wet condition of the needle electrode.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2022년도 제66차 하계학술대회논문집 30권2호
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• pp.485-486
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• 2022

본 논문에서는 OpenCV를 통해 기존의 물리적 버튼 등을 이용한 접촉제어가 아닌 비접촉으로 제어할 수 있는 시스템을 설계하였다. 시스템은 디지털 입력이나 아날로그 입력 등 두 가지 형태로의 모든 입력이 가능하며, 현실 세계에서 사람들이 사용하는 입력 방식과 유사한 방식으로 제어를 하게 함으로써 사용에 대한 기술에 대한 거부감을 줄일 수 있었다. 시스템은 ESP32-CAM 보드와 영상 스트리밍 서버를 FastAPI로 구축해 원격으로 접속과 조작이 가능하도록 설계하였다.

• 한국조경학회지
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• 제33권4호
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• pp.45-70
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• 2005

The purpose of this study is to overview foreign trends in the study of the landscape ecology through new framework of landscape ecological studies and to suggest possibility and limitation of introduction of landscape ecology studies in Korea. Because of historical reasons rooted in different disciplines, landscape ecology of the present time is not unified at all. Therefore, landscape ecology should be understood in an integrative manner accommodating different views and various aspects of landscape(NOOS, GEOS, BIOS). Facing the increasing environmental problems and the goal of sustainable landscape, the principle of a holistic approach complementarity and transdisciplinarity outlined in this paper (esp. connection physical-materials and cognitive system) might help to understand the characteristics of landscapes and landscape ecology. Important steps towards this direction are the landscape survey, diagnosis, the identification of landscape functions, the development of landscape evaluation models and landscape planning system. Recently there have been a few landscape ecological researches in Korea, which tells there have been strong needs to solve practical landscape problems caused by the rapid socioeconomic growth for several decades. However, almost of this studies are focused on cognitive and visual aspects of landscapes defined boundaries of disciplines. But for more holistic approach complementarity and transdisciplinarity in landscape ecological studies, many other aspects such as the consideration of geoecological and bioecologocal variables, preperation of ecological basic data(mapping) and the development of landscape planning as a tool for practical application should be integrated into the whole landscape system.

• 한국컴퓨터정보학회논문지
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• 제25권6호
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• pp.9-15
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• 2020

본 논문에서는 4차 산업혁명의 대표 기술 중 하나인 드론(무인항공)이 공항 안전 및 사생활 침해를 위협하는 사례를 제시 하고 문제를 해결하기 위해 드론 관제 시스템 제안을 기술하였다. 최근 (드론) 무인항공이 심각한 문제를 만들고 있다. 국내의 경우 19년 5월 21일 제주지방항공청에 따르면 같은 달 두 차례에 걸쳐 제주 정석비행장 상공에 드론이 비행하여 항공기 운행에 문제가 발생했고 해외 사례의 경우 영국 개트윅 국제공항 활주로 부근에 출현한 드론 때문에 항공기의 이착륙이 잠시 멈추는 소동이 발생하였으며, 또한 드론을 활용하여 개인의 사생활을 도촬 하는 등 여러 문제가 발생되고 있다. 본 논문은 드론(무인항공)에 Access Point(이하 AP) 트랜스폰더를 장착하여 드론의 비행정보(좌표, 고도, 장애 상태)를 원하는 불특정 다수가 드론 AP에 접근하여 드론의 비행정보를 수신 받고, 수신 받은 불특정 다수의 드론 AP 비행정보를 수집, 취합하여 유저 인터페이스 화면에 현 시점에 운행 중인 드론의 정보를 제공한다. 안전한 드론(무인항공)을 운행하기 위해 AP 트랜스폰더를 제안하고 드론의 비행 정보 송, 수신 및 데이터 수집 및 취합 실험을 수행한다[1-3].

• 한국태양에너지학회 논문집
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• 제31권6호
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• pp.103-110
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• 2011

The aim of this study was to analysis the Heating/cooling performance and Daylighting performance of Solar Window System built in apartments. the solar window is the idea to integrate daylight as a third form of solar energy into a PV/Solar Collector system. The process of this study is as follows: 1)Solar Window system was designed through the investigation of previous paper and work. 2)The simulation program(Lightscape3.2) was used in daylighting performance analysis. the reference model of simulation was made up to analysis daylighting performance on Solar Window system. 3)The simulation program(ESP-r, Therm5.0, Window6.0) was used in energy performance analysis. the reference model of simulation was made up to analysis energy and daylighting performance on Solar Window system. 4)The Size of Simulation model for daylighting and heating/cooling energy analysis was $148.5m^2$ 5)The lighting performance analysis was carried out with various variants, such as the size and installed area of Solar Window system. 6)Energy performance simulation was carried out with various variants, such as Integrated U-value of Solar Window system according to its position, installed angle and insulation thickness. Consequently, When Solar Window system is equipped with balcony window of Apartment, Annual heating and cooling energy of reference model was cut down at the average of $4.1kWh/m^2$ or 4.2%.

• 한국태양에너지학회 논문집
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• 제29권5호
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• pp.8-13
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• 2009

Feasibilities of the application of a micro gas turbine cogeneration system to a large size hospital building are studied by estimating energy demands and supplies. The energy demand for electricity is estimated by surveying and sorting the consumption records for various equipment and devices. The cooling heating, and hot water demands are further refined with TRNSYS and ESP-r to generate load profiles for the subsequent operation simulations. The operation of the suggested cogeneration system in conjunction with the load data is simulated for a time span of a year to predict energy consumption and gain profile. The simulation revealed that the thermal efficiency of the gas turbine is about 30% and it supplies 60% of the electricity required by the building. The recovered heat can meet 56% of total heating load and 67% of cooling, and the combined efficiency reaches up to 70%.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2009년도 하계학술발표대회 논문집
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• pp.1238-1243
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• 2009

As Social Overhead Capital(SOC) has been expanded, the highway road construction has been accelerated and city road system has been more complicated. So, long road tunnels have been increased and traffic flow rate also has been raised. Accordingly, the exhausting gas of vehicle cars seriously deteriorates the tunnel inside air quality and driving view. In order to improve tunnel inside air quality, it is needed to introduce a compulsory ventilation system as well as natural ventilation mechanism. The former, that is, a special compulsory ventilation facility is very useful and helpful to prevent a tunnel of being contaminated by traffic in most case. In the case of obtaining clearer and longer driving view, the ventilation systems have to be considered in order to remove floating contaminants or exhaust gas from engines. In this paper, discharge electrode design technology will be discussed.

• 동력기계공학회지
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• 제18권5호
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• pp.137-143
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• 2014

An investigation on lightning characteristics and damage to wind turbines was performed on Jeju and Gangwon regions. The lightning data from January 2010 to September 2013 detected by IMPACT ESP were collected and analyzed in detail. Hangyeong and Seongsan wind farms of Jeju province and Taebaek, Changjuk, Taegisan and Gangwon wind farms of Gangwon province were selected for this study. Lightning rates and lightning damage events at the six wind farms were compared with each other. Lightning maps for the two regions were drawn using lightning frequency data. As a result, lightning frequency of Gangwon region was higher than that of Jeju region, while lightning strength of Gangwon was weaker than that of Jeju. Lightning rates were assessed to be good for all of the six wind farms. No lightning damage to wind turbines occurred at the two wind farms of Jeju, while some lightning damage to wind turbines took place at the four wind farms of Gangwon.