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냉방부하 매칭 운전 알고리즘을 적용한 VRF 시스템의 성능평가
이재완,안영철,장석훈,김정훈,장세동 한국동력기계공학회 2019 동력시스템공학회지 Vol.23 No.5
본 연구에서는 VRF 시스템의 부하에 따른 목표 증발온도 가변 제어를 제안하였다. 냉방 부분부하 조건에서 실외온도와 습도를 고려하여 목표 증발온도를 높여 시스템의 능력을 줄여줌으로써 연속적인 운전을 가능하게 하고, 시스템 효율을 극대화 할 수 있도록 하였다. 이러한 로직 적용을 통해 연간 소비전력의 저감 효과를 시뮬레이션과 현장 제품테스트를 통하여 비교 검증하였다. 부하변동을 고려한 운전율 가변 제어시 쾌적성과 시스템 효율의 측면에서 온도와 습도를 함께 고려하여 제어하는 것이 효과적임을 확인하였다. 이러한 운전 제어 알고리즘을 이용한 효율의 개선은 추가 비용 부담이 없이 소프트웨어의 업그레이드 만으로 가능하기 때문에 VRF 시스템의 부분부하 효율 향상에 널리 기여할 수 있을 것으로 기대된다. 향후 다양한 설계조건에서의 시뮬레이션과 실증테스트를 통하여 DESC 로직의 실부하 운전조건에서의 부하대응 알고리즘을 더욱 정교하게 하여 VRF 시스템의 부분부하 운전에서의 효율을 더욱 개선할 수 있을 것으로 사료된다.
이재완 群山大學校 情報通信技術硏究所 1998 情報通信技術硏究論文集 Vol.2 No.-
As computer and communication technology is progressed, it is possible for systems to be interoperated in distributed systems. To provide the diversity services to user, system integration technology is needed. To do these, OMG proposed the CORBA which is middleware to be cooperated among distributed objects, regardless of specific plaforms and techniques. This paper proposes the reliable communication service based on the asynchronous event service suggested in OMG. A multicast service is also designed to be provided by using the distributor which is message agent.
이재완 청주대학교 산업과학연구소 1999 産業科學硏究 Vol.17 No.1
The marine algal flora and community structure of Jangho area, East coast of Korea, were investigated at two times June, 1998 and August, 1999. As a result, a total of 32 algal species - 6 greens, 7 browns and 19 reds - was identified. The flora was classified as the mixed flora based on species composition. In vertical distribution of intertidal marine algae, Chaetomorpha moniligera at the upper, Ulva pertusa at the middle, Sargassum thunbergii and Chondrus ocellatus at the lower zones, respectively. The dominant and subdominant species was Chondrus ocellatus, Ulva pertusa, Sargassum thunbergii, Chaetomorpha moniligera and Enteromorpha compressa. The biomass of the algal community on the average was 115.8 g dry wt/m²in dry matter.
이재완 청주대학교 산업과학연구소 2003 産業科學硏究 Vol.21 No.1
An intertidal marine algae at Taean peninsula, west coast of Korea, was investigated at seasonally March ∼ December 2002. As a result, a total of 44 algal species - 3 greens, 12 browns, and 20 reds - was identified. The marine algal flora was classified as the mixed one based on the species composition. The common species occurring frequently in this area through the year were Hizikia fusiformis, Sargassum horneri, S. thunbergii, melobesioedean algae, Gelidium divaricatum, Chondrus ocellatus, Gymnogongrus flabelliformis, Acrosorium yendoi, Ceramium boydenii, and Neorhodomela aculeata.
이재완 청주대학교 산업과학연구소 2000 産業科學硏究 Vol.18 No.1
An intertidal marine algal flora and community structure at Ulsan, east coast of Korea was investigated at two times June, 1998 and June, 2000 by a quadrat method along a transect line. As a result, marine algae were identified 29 species in 1998, and 25 species in 2000. The marine algal flora was classified as the mixed one based on the species composition. The dominant species were ULva pertusa in 1998 and Corallina pilulifera in 2000. The subdominant species Sargassum horneri, Corallina pilulifera in 1998 and Ulva pertusa, Enteromorpha linza in 2000. The vertical distribution pattern of intertidal marine algae was divided into three zones such as, Chaetomorpha moniligera (1998), Enteromorpha linza - Ulva pertusa, Corallina pilullfera - Sargassum thunbergu, S horneri (1998), S yezoense (2000) from upper to lower zones.
한국산 홍조류 붉은까막살 (Carpopeltis cornea)과 왕지누아리(Halymenia acuminata)의 ITS2 염기서열 비교
이재완 청주대학교 산업과학연구소 2000 産業科學硏究 Vol.18 No.1
Nucleotide sequences of the nuclear, ITS2 gene, as inferred from polymerase chain reaction amplified product, are introduced for Carpopeltis cornea and Halymenia acuminata in Korea .ITS2 sequences of C. cornea and H. acuminata are 366-bp, 359-bp long, respectively. Nucleotide difference of C. cornea and H. acuminata was 8 2% (30/366). The G+C content of C. cornea and H. acuminata was 45.4%, 44.4%, respectively. The 58s sequences of C. cornea and H. acuminata was showed the exactly same sequences of 129-bp long. Our ITS2 and 5.8s sequence data suggested that C. cornea and H. acuminata are not closely related group.
한국산 홍조 막우뭇가사리(Gelidium vagum Okamura)의 영양체 및 생식구조
이재완,이해복,이인규 청주대학교 산업과학연구소 1992 産業科學硏究 Vol.10 No.-
The vegetative structure and reproductive organs of Gelidium vagum Okamura were investigated in order to clarify the taxonomic characters of the species. The materials were collected at intertidal belt along the east, west and south coasts of Korea during May 1985 and June 1991. The plants grew singly on intertidal substratum by means of fibrous rhizoids. Primary branches became usually brother, tapering abruptly upward to form filiform branchlets. Broad surfaces of some main branches furnished with minute proliferations. Frond in section consisted of cortex, medulla and rhizoidal filaments. The reproductive structures were born on ultimate branchlets of the plant. The carpogonial branch was one-celled and developed from pericentral cells. The nutrient filaments developed at the base of carpogonial branches towards opposite direction of the trichogyne. The tetrasporangia occurred from fourth to sixth cortical cells from surface. They were divided mainly cruciately, or sometimes tetrahedrally. The taxonomic characteristics of the species, e.g., external morphology, occurrence of hairs, distribution of rhizoidal filaments, developmental sequence of carpogonial branch and nutrient filaments varied according to habitat of the populations.