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오연찬,이남도,김종구 한국환경과학회 2004 한국환경과학회지 Vol.13 No.3
This study was conducted to evaluate water quality in the Mankyung River using multivariate analysis. The analysis data which was surveyed from January 1996 to December 2002 in Mankyung river was aquired by the ministry of environment. Twelve water quality parameters were determined on each survey. The results were summarized as follow ; Water quality in the Mankyung River could be explained up to 74.90% by four factors which were included in loading of organic matter and nutrients by the tributaries(43.28%), seasonal variation(10.40%), loading of pathogenic bacteria by domestic sewage of Gapcheon (12.41%) and internal metabolism in river(8.81%). The result of cluster analysis by station was classified into three group that has different water quality characteristics. Especially, Iksan river was appeared to considerable water quality characteristics against other station. In monthly cluster analysis, three group was classified by seasonal characteristics. Also, in yearly cluster analysis, three group was classified. It is necessary to control the pollutant loadings by domestic sewage and livestock waste for water quality management of Mankyung river.
조아라,연찬미,김동현,정의헌 한국광학회 2016 Current Optics and Photonics Vol.20 No.1
Recently laser speckle contrast (LSC) imaging has become a widely used optical method for in vivoassessment of blood flow in the animal brain. LSC imaging is useful for monitoring brain hemodynamicswith relatively high spatio-temporal resolution. A speckle contrast imaging system has been implementedwith electrical sensory stimulation apparatus. LSC imaging is combined with optical intrinsic signal imagingin order to measure changes in cerebral blood flow as well as neural activity in response to electricalsensory stimulation applied to the hindlimb region of the mouse brain. We found that blood flow andoxygen consumption are correlated and both sides of hindlimb activation regions are symmetrically located. This apparatus could be used to monitor spatial or temporal responses of cerebral blood flow in animaldisease models such as ischemic stroke or cortical spreading depression.
SCM(Supply Chain Management)의 프로세스연구와 타 시스템과의 연계성 연구
박주식,이태우,연찬호,강경식 대한안전경영과학회 2001 대한안전경영과학회지 Vol.3 No.1
In supply chain management, coordination between a manufacture and suppliers Is regarded as the most important issue when partnership of organizations of considered. This paper Introduces the current status of SCM in terms of physical systems, relation with other solution systems as well as the general history and definitions of SCM. Researches are categorized into deterministic, stochastic, and several future research areas are discussed in the paper.
정력자(Lepidii seu Descurainiae Semen) 위품, 콩다닥냉이(십자화과)의 미세형태학적 연구
강 연찬,송준호 한약정보연구회 2024 한약정보연구회지 Vol.12 No.1
The Lepidium virginicum L., recognized as an adulterant of Lepidii seu Descurainiae Semen, belongs to the Brassicaceae Burnett family. This study aimed to analyze and describe the characteristics of epidermal cells from the leaves, sepals, petals, and seeds using light microscopy, stereoscopic microscopy, and field emission-scanning electron microscopy. The leaves of L. virginicum are of the amphistomatic type. The epidermal cells from the leaves are irregular and convex, with striations on the surface of the cuticle layer. There are long, simple unicellular trichomes on both the adaxial and abaxial surfaces of the leaves. The inner side of a sepal is an isodiametric rectangle, whereas the outer side has an irregular cell shape with an undulated anticlinal cell wall. A unicellular papillose trichome and stomata-like structures are present on the outer side of a sepal. The epidermal cells from an anther are square or pentagonal, with striations on the cuticle layer's surface. The petal's epidermal cells are hexagonal on the proximal surface and conical on the distal surface. The periclinal cell walls of a petal are convex with striations, and the cell shapes are papillose. A wing-like appendage is found at the marginal part of a seed, with papillose epidermal cells. The obtained results provide valuable information for the correct authentication of Lepidii seu Descurainiae Semen and offer insights into future taxonomic research on the genus Lepidium L.
신재생에너지 발전원을 고려한 발전기 예방정비계획수립에 관한 연구
이연찬(Yeonchan Lee),오웅진(Ungjin Oh),최재석(Jaeseok Choi),정명훈(Myeonghoon Jung) 대한전기학회 2018 전기학회논문지 Vol.67 No.5
The purpose of this paper is to establish a new optimum Generator Maintenance Scheduling(GMS) considering renewable energy generator. In this paper, the total renewable energy generation is estimated using hourly capacity factor of renewable energy generator. The GMS was optimized with the objective function of maximizing the minimum reserve rate, minimizing the probabilistic production cost, minimizing the loss of load expectation, and minimizing CO₂ emissions. In the case study of this paper, GMS considering renewable energy and GMS not considering renewable energy are shown by each objective function. And it shows scenarios of the reliability, the environmental and economical factors when two nuclear power plants inputted and ten coal thermal power plants shut downed respectively.