돌산갓의 핵산관련물질의 HPLC 함량

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

부산의 인공도 계획

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

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.

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.

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.

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

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.