양계사육을 위한 PC기반 LED 조광제어 시스템에서의 플리커링 현상에 관한 연구

조현길,이인수 제어로봇시스템학회 2014 제어로봇시스템학회 국내학술대회 논문집 Vol.2014 No.5

양계사육을 위한 PC기반 LED 조광제어 시스템 개발

조현길,이인수 한국정보기술학회 2014 한국정보기술학회논문지 Vol. No.

본 논문에서는 양계사육을 위한 PC 기반 LED 조광제어 시스템을 설계하고 제작하였다. 제안한 LED 조광제어 시스템은 운행을 위한 소프트웨어 프로그램과 임베디드 장치 및 펌웨어로 구성되어 있다. 또한 실험을 통해서 입력전압에서의 위상변화에 의해 깜빡거림인 플리커링 현상이 발생됨을 알 수 있었다. 만일 플리커링 현상이 발생되면 조명이 불규칙해진다. 또한 플리커링은 닭의 큰 스트레스의 원인이 된다. 그러므르 본 논문에서는 플리커링 현상을 감소시킬 수 있는 아날로그 위상동기화 회로를 이용한 새로운 조광 시스템을 개발하였다. 실험결과 제안한 아날로그 보상 회로에 기반한 조광방법을 적용한 경우에는 플리커링 현상이 발생되지 않음을 알 수 있었다. In this paper, we designed and manufactured a PC based LED(light emitting diode) dimming control system for poultry breeding. The proposed LED dimming control system consists of software program for operating and embedded device/firmware. From the experiments, also, we know that the variations of the phase of the input voltage is the cause of flickering. If a light flickers, it shines unsteadily. It also causes great stress to hens. In this article, therefore, a new LED dimming control system with analog phase synchronizing circuit was developed in order to reduce the flickering phenomenon. From the experiment results by proposed LED dimming control method based on analog phase synchronizing circuit for compensation of flickering phenomenon, we knew that there was no flickering phenomenon.

캠퍼스 조경식재의 문제점과 개선방안 연구 : 강원대학교를 대상으로

조현길 강원대학교 조형예술연구소 2007 조형예술연구 논문집 Vol. No.8

The purpose of this study is to analyze problems of campus landscape plantings for Kangwon National University and to explore desirable strategies to improve the problems. The problems and strategies were derived from field survey and questionnaire. Major problems were represented by lack of imageability along main access roads, low landscape diversity and poor sense of the season at building planting-strips, single-layered/spotty plantings and few resting spaces on large grass area, and poor plantings on artificial structures such as parking lots and walls. These problems resulted from a instant, decorative plantings by lay people after the completion of a construction without a landscape master plan by experts. This study suggested landscape planting strategies to improve each problem for access roads, a plaza, building planting-strips, grass spaces, resting places, parking lots, and cut slopes/retaining walls in the campus.

Carbon Storage and Uptake by Street Trees in Seoul

조현길,김진영,박혜미 강원대학교 산림과학연구소 2018 Journal of Forest Science Vol.34 No.2

This study quantified the carbon storage and uptake by street trees in Seoul and explored suitable planting and management strategies. A systematic sampling model was used to select 50 plots to survey the structures of street trees. The average density and cover of street trees were approximately 5.8 trees/100 m2 and 12.1%, respectively. Trees with a dbh of less than 30 cm accounted for about 66.3% of the total number of trees surveyed. The total carbon storage and uptake by the street trees were approximately 103,641 t and 10,992 t/yr, respectively. The total carbon uptake equaled the amount of annual carbon emissions from driving of about 11,000 cars. Street tree planting and management strategies were proposed to enhance carbon uptake. They included multi-layered and multi-aged planting, securing ground and space for plant growth, and avoiding excessive tree pruning.

Carbon Reduction Services of Evergreen Broadleaved Landscape Trees for Ilex rotunda and Machilus thunbergii in Southern Korea

조현길,김진영,박혜미 강원대학교 산림과학연구소 2019 Journal of Forest Science Vol.35 No.4

This study quantified carbon reduction services through direct harvesting of Ilex rotunda and Machilus thunbergii, which are the typical urban landscape tree species in southern Korea. A total of 20 open-grown tree specimens (10 specimens for each species) were selected reflecting various sizes of stem diameter at breast height of 1.2 m (DBH) at a regular interval. The study measured biomass for each part of the tree specimens including roots to compute total carbon storage per tree. Annual carbon uptake per tree was also calculated analyzing the DBH growth rate of stem disk specimens. Quantitative models were developed using DBH as an independent variable to easily estimate storage and annual uptake of carbon by tree growth for each species. All the models had a high goodness-of-fit with R2=0.95-0.99. The difference in carbon reduction services between DBH sizes increased with increasing DBH. The storage and annual uptake of carbon from a tree with DBH of 10 cm were 13.5 kg and 2.4 kg/yr for I. rotunda, and 19.1 kg and 3.6 kg/yr for M. thunbergii, respectively. The tree of this size stored the amount of carbon equivalent to that emitted from a gasoline use of approximately 24 L for I. rotunda and 34 L for M. thunbergii, respectively. The study provides actual measurement data to quantify carbon reduction services of urban open-grown landscape trees for the warm-temperate species that have been little known until now.

춘천시 주거지구내 수목피도의 차이가 난냉방에너지 이용 및 비용에 미치는 효과

조현길,안태원 한국조경학회 1999 韓國造景學會誌 Vol.27 No.2

This study quantified shading, evapotranspiration and windspeed-reduction effects of trees on use and cost of heating and cooling energy in two residential neighborhoods of Chuncheon different in tree cover. Annual savings per residence of heating energy were approximately 1,210 MJ(1%) and those of cooling energy, 130 kWh(10%) in study district 1 having tree cover of about 10% . For district 2 with tree cover of about 20%, annual heating and cooling savings were 2,130 MJ(2%) and 180 kWh(19%) per residence, respectively. Trees annually saved energy costs by approximately ￦31,000 ($26, $1=￦1,200) per residence in district 1 and by ￦49,000($41) in district 2. One tree taller than 3 m resulted in annual energy savings of ￦8,000($7) in the study districts. Energy savings by trees in district 2, which had higher tree cover by 10% difference than district 1, were about 2 times greater than those in district 1. This implies that more tree plantings could enhance energy saving effects. Of the total costs saved, 58% was attributed to windspeed reduction and 47%, evapotranspiration. However, shading increased energy costs by 5% due to tree plantings at the wrong locations. Full tree plantings on the west and north of buildings and avoidance of shade-tree plantings of use of solar-friendly trees on the south are recommended to increase building energy savings efficiently.

도시녹지의 대기환경개선 효과 : 서울시 중구를 중심으로;Focusing on Jung-gu in Seoul

조현길,조용현,안태원 江原大學校 附設 環境硏究所 2003 環境硏究 Vol.20 No.-

This study explored effects of urban greenspace on improving atmospheric environmcnt, which is concerned with CO₂, SO₂and NO₂ uptake, and with reduction of summer air temperatures. The site of this study was focused on Jung-gu in Seoul. Tree density and cover were1.1trecs/l00 m₂and 12.5% respectively for the study area except forest lands. Atmospheric purification by greenspace was associated with changes in tree cover per unit area of each land use type. The mean C02 storage by woody plants was 19.4t/ha, and annual uptake averaged 2.2t/ha/yr for C0₂, 1.9kg/ha/yr for SO₂and 5.0kg/ha/yr for NO₂. Entire tree plantings in the study area played a significant role by annually offsetting CO₂emissions of about 1,8301 from fossil fuel consumption by 330 persons, SO₂emissions of 1,620kg by 1,080 persons, and NO₂emissions of 4,230kg by 450 persons. The smnmer air temperature was 3.6℃ cooler at a location with 54% cover of woody plants and 4.5℃ cooler at a forest site with 100% cover, compared to a place with no planting. A 10% increase of woody plant cover was estimated to decrease slimmer air temperature by approximately 0.6℃ until a certain level of canopy cover. Analyzing data from the Automatic Weather Stations in Seoul revealed that increasing tree cover decreased mean air tern-perature for the smruner season (Jun∼Aug) in a nonlinear function. Woody plant cover was the best predictive variable of summer temperature reduction. The results from this study are expected to be useful in emphasizing the environmental benefits and importance of urban greenspace enlargement, and in urging the necessity for planting and management budgets.

마을 이미지성 창출을 위한 경관개선 구상 : 정선군 카지노 타운을 대상으로

조현길,김점수 강원대학교 조형예술연구소 2002 조형예술논문집 Vol.4 No.-

The purpose of this study is to identify landscape problems for Gohan and Sabook, casino towns in Jeongseon, and to conceptualize improvement strategies to create desirable village imageability. The study selected viewpoints with great visual quantity or high visibility, took photographs, and mapped spatially landscape problems and solutions. Main landscape problems of the study villages were bared tailings and cut slopes, inharmonious afforestation, old and poor buildings, confused skylines, and messed signboards and utility lines. Poor tree plantings on streets and around buildings, and stream pollution were also deteriorating visual quality of landscapes. Landscape planning of the study villages needs to put an emphasis on creating the imageability based on rurality and mining history. Priority of landscape improvement should be given to remodeling of building appearance, streetscape, and greenspace. Especially, within street viewshed having high visibility, required are building improvement, signboard regulation, native street-tree plantings, and screening plantings of old buildings. The results from this study are expected to be applied as practical information to regional policy formulation to improve the image of the study villages' built landscapes and to attract casino visitors and other tourists.

야영행위가 식생 및 토양에 미치는 영향에 고나한 연구-지리산국립공원 화엄사 지구 야영장을 대상으로

조현길,이경재,오구균 한국조경학회 1987 韓國造景學會誌 Vol.14 No.3

The overuse in the outdoor recreation lands has been deteriorating the natural resources and landscapes. So this study was executed to measure the users'impacts on vegetation and soil at Hwaum Temple District Campsite in the Mt. Jiri National Park, the southern part of Korea. Five sites were sampled in the study area according to the extent of impact observed. Then the users'densities and impacts on vegetation and soil were measured at each site. According to the result of this study, the numbers of species and individuals and the coverage of lower-layer vegetation showed outstanding changes by only light use. The numbers of species and individuals of middle-layer vegetation, species diversity indices, change rate in species composition of lower and middle-layer vegetation, damage rate of forces, contents of clay, soil moisture and organic matters, exchangeable base ions, soil hardness, organic matter depth and bare area of the campsite showed conspicuous changes from the site 4(19.6men / 1,000㎡). Especially, the self-repair of vegetation was impossible as the result of analysis of soil hardness and the formation of natural vegetation was expected to be difficult as the result of vegetation sturcture analysis over the users'average density of 19.6men /1,000㎡. The campsite management of this area shall be proposed as follows to prevent serious deterioration of natrual environment. A limitation of the present use and a conservation on soil and vegetation should be required at the site 4 and 5. Specially, prevention of camping recreation and artificial rehabilitation are necessary at the site 5(24. 3 men/1000㎡)

Implementation of an Energy Conservative Temperature and Humility Control System Using Carbon Heating Material in the Agro-livestock Field

조현길,이인수 한국정보기술학회 2014 JOURNAL OF ADVANCED INFORMATION TECHNOLOGY AND CON Vol.4 No.2

This study is to produce an energy-conservative temperature and humility control system by means of carbon heating materials. The produced carbon rods heater control system consists of the embedded devices and firmware programs. Additionally, its Android smart app program has been designed as well. The suggested carbon rods heater control system adopts SCR for high-power phase control. The temperature and humidity control device that adopts carbon heating materials developed in this study reduces power consumption as much as 20 to 40% compared to commonly used electrical heating elements.