돌산갓의 핵산관련물질의 HPLC 함량

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

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.

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.

접지계통의 보호계전시스템에 대한 영향

김재이 東新大學校 2002 論文集 Vol.12 No.-

In operating power substation the roll of grounding is closely related with power system protection system. The grounding system is very important in order to raise the power system reliability. This paper presents a effect investigation for asymmetry properties, equivalent modeling of substations grounding system, overvoltage analysis by EMTP and operating examples of protection relay.

접지전극의 경년변화 조사연구

김재이,고태석 동신대학교 환경연구소 2004 환경연구 Vol.9 No.1

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.

통신기지국 접지시스템의 과도현상 해석에 관한 연구

김재이,윤태양 東新大學校 工業技術硏究所 2003 工業技術硏究 Vol.9 No.-

The grounding system design of the communication base station can be on the unfavorable conditions to induce the safe designing because of the limited area of the communication base station and the week point of surge caused by the given geographical condition such as the top point of mountain. In this thesis, it is examined throughly about the way of safe designing that can reduce GPR(Ground Potential Rise) within the normal frequency band. And it is also considered the effective counter plan to cope with a transient phenomena that happen when surge of scores MHz-band inserted.

부산의 인공도 계획

김재이,KIM Jae Kyoung 대한화약발파공학회 1993 화약발파 Vol.11 No.3

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.

통신설비 접지설계기술의 개선

김재이 東新大學校 1996 論文集 Vol.8 No.-

The transient characteristics of grounding systems are very important in the grounding design of communication installations and depend on the shape and size of electrodes, soil resistivity and the magnitude and wave of the injection current. Generally former grounding design was not considered grounding resistance by transient analysis. This paper presents an algorithm to compute the transient grounding resistance of grounding systems and simulation results are compared with the measured datas to prove the validity of the algorithm.

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.