돌산갓의 핵산관련물질의 HPLC 함량

김재이,최재수,최홍식 한국생명과학회 2000 한국생명과학회 학술발표회 Vol.27 No.-

가정용청소기의 유해전자파 억제대책에 관한 연구

김재이,고영권,전숙희 東新大學校 1999 論文集 Vol.11 No.-

In this paper, various emission patterns of vacuum cleaners were investigated. The typical models of each marker were selected in the study. The frequency and included voltage of EMI(electromagnetic interference) from each vacuum cleaners were measured by using electromagnetic receptor. As the result, we were found that the vertical deflection frequency and induced voltage is about 1~8[㎒] and 6~20[㏈㎶] respectively.

OA용 CRT 모니터의 유해 전자파환경 개선대책

김재이,고영권 동신대학교 환경연구소 2002 환경연구 Vol.7 No.1

오늘날 우리는 많은 정보통신 단말기, 사무자동화기기 그리고 측정기기를 사용하고 있다. 본 논문에서는 가장 대표적인 PA용 CRT 모니터에서 방출되는 유해전자파방출패턴을 조사하였다. 각 제작사의 대표적 모델이 본 연구를 위해 선정되었으며, 각 CRT로부터 방출되는 유해전자파의 유기전압과 주파수는 특별히 제작된 전자파수신기를 사용하여 측정 하였다. 연구결과로서, 메쉬방법을 이용한 EMI차폐 효과는 매우 안전하고 효과적임을 확인하였다. Nowadays, we are using many information and communication apparatus, office automation machinery and tools and measurement instruments. In this paper, various emission patterns of typical cathode-ray tubes were investigated. The typical models of each maker were selected in the study. The frequency and induced voltage of EMI(Electromagnetic interference) from each cathode-ray tubes were measured by using special electromagnetic receptor. As the result, we knew that the EMI shielding effect by mesh method is very effective and safe.

속도 제어와 차간거리 제어 수용성 개선을 위한 종방향 알고리즘 개발

김재이,박만복 한국ITS학회 2022 한국ITS학회논문지 Vol.21 No.3

Driver acceptance of autonomous driving is very important. The autonomous driving longitudinal controller, which is one of the factors affecting acceptability, consists of a high-level controller and a low-level controller. The host controller decides the cruise control and the space control according to the situation and creates the required target speed. The sub-controller performs control by creating an acceleration signal to follow the target speed. In this paper, we propose an algorithm to improve the inter-vehicle distance fluctuations that occur in the cruise control and space control switching problems in the host controller. The proposed method is to add an approach algorithm to the cruise control at the time of switching from cruise control to space control so that it is switched to space control at the correct switching distance. Through this, the error was improved from 12m error to 4m, and actual vehicle verification was performed. 자율주행 시스템의 수용성 보장은 중요하다. 시스템 수용성 요소 중 하나인 자율주행 종방향 제어기는 상위 제어기와 하위 제어기로 구성된다. 상위 제어기는 Cruise 제어와 Space 제어를 상황에 맞는 제어를 결정하고 필요한 목표 속도를 만든다. 하위 제어기에서는 목표 속도를추종하기 위한 가속도 신호를 만들어서 제어를 수행한다. 본 논문에서는 상위 제어기에서Cruise 제어와 Space 제어전환 문제에서 발생하는 차간거리 변동을 개선하는 알고리즘을 제안한다. 제안한 방법은 Cruise 제어에서 Space 제어로 전환되는 시점에 Cruise 제어에 Approach 알고리즘을 추가하여 전환 거리에서 Space 제어로 전환되도록 하는 것이다. 이를 통해서 ± 12m 초기 오차에서 ±4m까지 오차를 개선했으며 실차검증을 수행하였다.

Effect of bioactive glass addition on the physical properties of mineral trioxide aggregate

김재이,김현정,Seok Woo Chang,Soram Oh,Sun Young Kim,Kyoung-Kyu Choi,Duck-Su Kim,Ji-Hyun Jang 한국생체재료학회 2021 생체재료학회지 Vol.25 No.4

Background: The addition of bioactive glass (BG), a highly bioactive material with remineralization potential, might improve the drawback of weakening property of mineral trioxide aggregates (MTA) when it encounters with body fluid. This study aims to evaluate the effect of BG addition on physical properties of MTA. Methods: ProRoot (MTA), and MTA with various concentrations of BG (1, 2, 5 and 10% BG/MTA) were prepared. Simulated body fluid (SBF) was used to investigate the effect of the storage solution on dentin remineralization. Prepared specimens were examined as following; the push-out bond strength to dentin, compressive strength, setting time solubility and X-ray diffraction (XRD) analysis. Results: The 2% BG/MTA showed higher push-out bond strengths than control group after 7 days of SBF storage. The 2% BG/MTA exhibited the highest compressive strength. Setting times were reduced in the 1 and 2% BG/MTA groups, and solubility of all experimental groups were clinically acceptable. In all groups, precipitates were observed in dentinal tubules via SEM. XRD showed the increased hydroxyapatite peaks in the 2, 5 and 10% BG/MTA groups. Conclusion: It was verified that the BG-added MTA increased dentin push-out bond strength and compressive strength under SBF storage. The addition of BG did not negatively affect the MTA maturation reaction; it increased the amount of hydroxyapatite during SBF maturation.

GIS형 접지계의 분류율 산정에 관한 연구

김재이,정길조 대한전기학회 2005 전기학회논문지C Vol.54 No.4(C)

The testing and evaluating shunting rates of operating substations have become difficult recently due to various factors including increased fault current, limited area of urban substations and construction of substations in mountain location. In this paper, we have analysed the computation and measurement method of shunting currents that be applied grounding system maintenance of power substations. Also, simple and detailed test methods using 70Hz current injection are explained. A computer program is developed for a study on the shunting properties such as grounding impedance and shunting rates of grounding current, and the simulation results are compared with the measurement data to prove validity and effectiveness of the program and measurement method under commercial operation of a GIS type model substation respectively.

접지계의 경년변화 특성에 관한 연구

김재이 대한전기학회 2005 전기학회논문지C Vol.54 No.5(C)

In this paper, the secular changes of buried grounding electrodes was investigated; the electrodes are such facilities as grounding grid, grounding connector, grounding terminal and grounding rod etc.. The corrosiveness of removed substation grounding electrodes after commercial operation more than 50 years was measured and its conductivity deterioration trend was analyzed. The measuring results using three experimental methods were compared, finally the consideration for safe and economic grounding design were shown. As the result, it shows the maintenance necessity of grounding systems.

大豆의 遺傳的 變異와 選拔에 關한 硏究

金在利 건국대학교 1976 論文集 Vol.3 No.1

In order to establish gene source bank of soybean, collection of 825 lines currently grown by farmers was made from the southern part of Korean peninsula. From this population, the range of phenotypic variation of several important agronomic characters and the amount of genetic variation within the population with the aid of suitable genetic parameters, such as genetic coefficient of variation, heritability, and genetic advance for improvement of the traits were investigated. An attempt was also made to get available information on the relative importance of yield components fur developing high yielding variety. The results were summarized as follows : 1.Yield was ranged from 190.0 kg to 2,349 kg per hectare with the standard deviation of 494.04. Majority of lines of the collection were ranged between 795 kg and 1,245 kg and 30 lines yielding over 1,620 kg were found. 2.The collection was consisted of two different groups in seed size, 13.5 gr and 29.0 gr in average of 100 seed weight, respectively. Of the collection, five lines were over 40 gr in 100 seed weight. Plant height was ranged from 45.5 cm to 129.0 cm with the average of 74.79 cm and number of pods per plant from 26.0 to 140.5 with the average of 52.83 was observed. 3.Protein content was ranged from 37.0% to 49.5% and the average was 42.03%. The major part of the collection was distributed from 40.7% to 44.2% in protein content. The average of oil content was 11.46%, and 70 percent of the collection was distributed between 16.5% and 19.0%. These results suggest that high protein lines among the collection flay play an significant role for improvement of protein content, whereas high oil content line was not found from this collection. 4.Seed weight, plant height, and number of pods per plant were shown relatively high heritability value and genetic advance. However, maturity showed high heritability estimate but less genetic advance due to the narrow range of phenotypic variation. 5.The genotypic and phenotypic correlation coefficients showed that the yield of soybean was positively associated with seed weight, number of pods per plant, plant height, and maturity. The high possitive correlations between seed yield and yield components may be due to the high positive direct effect of the yield components upon yield . In general, the genotypic correlation coefficients were found to be higher than the phenotypic correlation coefficients. Consequently, it could be concluded that seed weight, number of pods per plant, plant height, and maturity were useful as an indicator for selection of high yielding variety.

가전기기의 불요전자파 억제를 위한 효과적인 차폐시스템 구현

김재이,정종욱 동신대학교 환경연구소 2003 환경연구 Vol.8 No.1

In this paper, electromagnetic wave environment generated from electronic equipments was investigated. Since the main source of electromagnetic waves are electronic Equipments, the field intensity of a harmful electromagnetic wave was measured and its harmful level was analyzed. In case of such appliances as electric blender, electric hair dryer, ect. which main operating component is a motor, the unwanted electromagnetic waves ranging from 30MHz to 500MHz of wide frequency band were reduced to about 14% in average. It was also found that the result was 23% in case of TV set; 38%, microwave oven; and 27% -65%, vacuum cleaner, respectively. Based on this analysis, this study proposed efficient shielding method to suppress unwanted electromagnetic waves

PC모니터의 장해전자파 방출 특성

金在珥,高永赫 東新大學校 工業技術硏究所 1997 工業技術硏究 Vol.3 No.-

In this paper, various emission patterns of personal computer monitors were investigated. The typical models of each maker were selected in the study. The frequency and induced voltage of EMI(electromagnetic interference) from each personal computer monitor were measured by using electromagnetic receptor. As the result, we were found that the vertical deflection frequency and induced voltage is about 30∼50[KHz] and 10∼60[db μV] respectively.