1Ll-7 Recent Trend on Cathode Materials for High Energy Lithium lon Batteries

김점수 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.0

전기자동차용 이차전지 기술동향

김점수 대한전기학회 2010 전기의 세계 Vol.59 No.4

수평격판을 갖는 상부가 부분 개방된 밀폐공간내의 자연대류

김점수,정인기,송동주,Kim, J.S.,Chung, I.K.,Song, D.J. 대한설비공학회 1995 설비공학 논문집 Vol.7 No.3

Natural convective flow and heat transfer characteristics in a partially opened enclosure fitted with a horizontal divider are investigated numerically. The enclosure is composed of a lower hot and a upper cold horizontal walls and adiabatic vertical walls. A divider is attached perpendicularly to the vertical insulated wall. The governing equations are solved by using the finite element method with Galerkin method. The computations have been carried out by varying the length of divider, the opening size, and the Rayleigh number based on the temperature difference between two horizontal walls and the enclosure height for air(Pr=0.71). As result, when the opening size is fixed, the intensity of the secondary flow is weaken as the length of divider increases. The maximum heat transfer rate over the upper cold wall occurs at a position bounded on the opening. However, when the length of divider is increased considerably, its maximum occurs at the right wall. The stability and frequency of oscillation are affected by the Rayleigh number and length of divider. The Nusselt number is increased with the increase of the opening size and the increase of Rayleigh number.

제어판이 부착된 수평격판에 의해 분리되는 밀폐공간내의 난류 자연대류 열전달 특성

김점수 대한설비공학회 2000 설비공학 논문집 Vol.12 No.2

Turbulent natural convective flow and heat transfer in a square enclosure with horizontal partition are investigated numerically. The enclosure is composed of a lower hot and a upper cold horizontal walls and adiabatic vertical walls. Partitions carried with the upward, downward, and both control plates are attached perpendicularly to the one of the vertical insulated walls, respectively. The low Reynolds number $k-\varepsilon$ model is adopted to calculate the turbulent thermal convection. The governing equations are solved by using the finite element method with Galerkin method. The computations have been carried out by varying the length of partition, the position of control plates, and the Rayleigh number based on the temperature difference between two horizontal walls and the enclosure height for water(Pr=4.95). When the control plates are attached at the edge of partition, the stability of oscillating flow grows wrose with the increase of Rayleigh number and the partition length. The heat transfer rate has been reducer than that of no control plate due to the restraint of control plates with the increase of Rayleigh number.

함정용 전투체계 아키텍처 개선을 위한 실시간 운영체제 적용방안 연구

김점수,장혜민,주정현,이균정,Kim, Chum-Su,Chang, Hye-Min,Joo, Jung-Hyun,Lee, Gyoon-Jung 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.3

A combat system for navy's battleship is a system of systems who supports naval indigenous operations by integrating and inter-operating many different kind of weapon and non-weapon systems, which has characteristics of large-scale complex computing system. This paper considers a characteristics of naval combat system which has been developed by domestic technology and suggests a way to improve future naval combat system in terms of computing architecture by applying commercial real-time operating system technologies. This paper also provides an evaluation criteria for combat system adaptability of real-time operating systems.

수평격판으로 분리된 정사각형 밀폐공간내의 층류 자연대류 해석

김점수,정인기,Kim, J.S.,Chung, I.K. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.3

The natural convective flow in a two-dimensional square enclosure with horizontal partitions is investigated numerically. The enclosure was composed of the lower hot and the upper cold horizontal walls and the adiabatic vertical walls, and two identical partitions were positioned perpendicularly at the mid-height of the right and left walls, respectively. The governing equations are solved by using the finite element method with Galerkin method. Calculations are made for different partition lengths, partition conductivites, and Rayleigh numbers based on the temperature difference between two horizontal walls and the enclosure height with water(Pr=4.95). An oscillatory motion of the natural convective flow is affected significantly by the variation of the gap width and Rayleigh number. When the gap width is comparatively short, the heat transfer rate is raised with the increase of the thermal conductivity of partitions. However, for sufficiently large gap widths at higher Rayleigh numbers, the average Nusselt numbers of the conductive partitions are smaller than those of the adiabatic partitions.

사상공단의 대기오염이 주변 산림의 식생구조에 미치는 영향

김점수,이강영 ( Jeom Soo Kim,Kang Young Lee ) 한국산림과학회 1996 한국산림과학회지 Vol.85 No.1

The object of this study was to examine the effects of air pollution on forest vegetation structure in the vinicity of Sasang industrial complex in Korea. Forest vegetation structure was investigated at 19 sample plots surrounding industrial complex and at one site away from industrial complex as a control. The results obtained were as follows; 1. For analysis of vegetation structure, upperstory of forests was mostly consisted of Pinus thunbergii, and partly of Alnus firma and Robinia pseudoacacia. In midstory, major components were Pinus thunbergii, Robinia pseudoacacia, Rhus trichocarpa, Rhus chinensis and Styrax japonica, In lower story, Pinus thunbergii was a minor component, while Robinia pseudoacacia, Quercus serrata, Rhus trichocarpa. and Rhododendron yedoense var. poukhanense which were known to be resistant to air pollution were found in large number. Especially, importance percentage of Robinia pseudoacacia was high, while that of Rhododendron mucronulatum was low in surrounding industrial complex. 2. For woody plants, number of species, species diversity and similarity index in industrial complex, were not significantly different from those in control plot. 3. For herbs, Oplismenus undulatifolius appeared in large number in most plots. The SDR₃ of Miscanthus sinensis, Calamagrostis arundinacea, Paederia scandens, Spodiopogon cotulifer and Carex humilis were high, but that of Aster scaber, Saussurea seoulensis, Solidago virgaaurea var. asiatica and Prunella vulgaris var. lilacina were low in the vicinity of industrial complex. 4. Number of herb species decreased to below 10 species at surrounding industrial complex as compared to 20 species in the control plot. In addition species diversity, and similarity index in the industrial complex were lower than those in control plot. It may be concluded that Pinus thunbergii forests in industrial complex consists of tree species resistant to air pollution, and that composition of woody vegetation in industrial complex was not much different from control plot, while composition of herbs was already quite different between the two plots. Forest vegetation structure, therefore, may change with time due to air pollution in the industrial complex.

사상공단 주변의 대기오염이 해송림에 (海松林) 미치는 영향

김점수,이강영 ( Jeom Soo Kim,Kang Young Lee ) 한국산림과학회 1994 한국산림과학회지 Vol.83 No.4

The objective of this study was to examine the effects op air pollution on Pinus thunbergii forests surrounding Sasang industrial complex in Korea. The injury index, contents of chlorophyll and mineral elements, and concentrations of water soluble sulfur in needles were investigated at sample plots surrounding industrial complex and compared with those of control far from industrial complex. The results obtained are as follows : 1. Discoloration of Pinus thunbergii needles was severe in the vicinity of industrial complex, and the older needle age classes was the more severe its injury appeared. Injury index was increased in the vicinity of industrial complex. 2. Water-soluble sulfur concentration was high in the vicinity of industrial complex at all of needle age classes, and those of all plots were higher than that of control. 3. Chlorophyll a contents were lower at surrounding industrial complex than that at control. It was supposed that chlorophyll a was destroyed by air pollutants. Total chlorophyll contents and content ratio of chlorophyll a to b were influenced by decrease of chlorophyll a contents. 4. Phosphorus contents in needles were decreased even in remoted regions with the increase of needle age classes. Colcium contents in needles were decreased near industrial complex at all needle ages classes. 5. There were negative correlation, between injury index and chlorophyll contents, injury index and calcium contents, and there were positive correlation between injury index and calcium contents. 6. Cluster analysis was carried out to divide the injured regions on sample plots. As a result of the analysis, there were devided 3 regions, severe regions(1 8 plots), medium regions (9, 10, 11, 12, 15, 17 plot), slight (13, 14, 16, 18, 19 plot and control) . 7. The cross section of visible injured needle showed the destruction of mesophyll cell, sclerenchyma cell in the outside of resin duct and endodermis, partially.

담즙성 구토와 혈변을 주소로 내원한 3일된 신생아의 장간막 림프관종 1례

김점수,정혜성,강기수,김용숙,박찬후,최명범,우향옥,고경혁,윤희상 대한소아청소년과학회 2001 Clinical and Experimental Pediatrics (CEP) Vol.44 No.11

Effects of Fish-Meal Application on the Growth of Chinese Cabbages (Brassica Campestris L.) and Soil Chemical Properties

김점수,강헌일,권기윤,박남숙,김동근,최인수 한국토양비료학회 2019 한국토양비료학회지 Vol.52 No.3

nitrogen requirements by evaluate the effect of the pollack fish-meal incorporation on growth properties of cabbage and soil chemistry. The study was conducted as pot (1/2,000a) test at the Miryang in Korea from May to August 2017. The treatment was divided into two groups; the amount of fish-meal treated were based by comparing the standard application ratio of nitrogen for Chinese cabbage with the nitrogen content of the fish-meal, and the chemical properties and the growth of the cabbage were compared by the treatments of 50%, 100%, 150%, 200% and 250%. The results obtained are following; the ammonia gas was produced from the after 2nd day of incorporated, and the amount of ammonia gas generated was geometrically correlated with the amount of fish processed. The soil pH level after study was lowered to about the pH 5.1 from 32.1 g/pot (1/2,000a). Due to the fish-meal increased the EC, content of Av. P2O5 acid and inorganic nitrogen, and the pH level did not decrease even when the inorganic nitrogen increased at NO3 - ‒N content of 5.4 mg/kg and NH4 + ‒N was higher than 3.3 mg/kg. The SPAD value at the time of cabbage harvest was positive correlation with the amount of fish-meal treated, and the biomass was similar to that of SPAD. The biomass of Chinese cabbage in fish-meal plots were higher than that of conventional treatments, and the weight of the headed cabbage was the highest in T4 (64.1 g/pot). The number of cabbage leaf was the highest in T3 (53.4 g/pot). Based on the above results, it is thought that if the C/N ratio adjusted plant organic resources, methods of mixing and technologies for minimizing pH drop are supplemented, it will be excellent eco-friendly organic resources instead of synthetic nitrogen