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펄스모드 스위칭 직류전원 장치에 적합한 AC/DC 컨버터
문상호(S.H.Moon),노의철(E.C.Nho),김인동(I.D.Kim),김흥근(H.G.Kim),전태원(T.W.Chun) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
This paper describes a novel multilevel ac/dc power converter suitable for the protection of frequent output short-circuit. The output dc power of the proposed converter can be disconnected from the load within several hundred microseconds at the instant of short-circuit fault. The rising time of the de load voltage is as small as several hundred microseconds, and there is no overshoot of the dc voltage because the dc output capacitors keep undischarged state, Analysis and simulations are carried out to investigate the operation and usefulness of the proposed scheme
호맥건초의 생육단계와 절단이 산양의 채식 및 반추행동에 미치는 영향
문상호 ( S H Moon ),전병태 ( B T Jeon ),광전수헌 ( H Hirota ) 한국축산학회 1995 한국축산학회지 Vol.37 No.2
To determine feeding behavior in relation to quality and physical form of feed, this experiment was cunducted by feeding trials to evaluate eating and rumination behavior in goats fed a rye hay in a unchopped or chopped form harvested at two stages of maturity. Rye hay dried at two different stages of growth for experimental rations was offered ad libitum in the unchopped or 2cm long chopped form to twelve goats. Although there were no significant differences (P$gt;0.05), eating time was longer in the chopped form than in the unchopped form at harvested both growth stages, but times for the different growth stages were hardly different. Rumination time was longer in the group fed unchopped hay harvested at the boot stage and in the group fed chopped hay harvested at the heading stage, however, the differences were not significant (P$gt;0.05). Resting time was in contrast to rumination time. Goats in all groups exhibited the similar behavioral patterns, showing longer periods of eating from 12:00 to 19:00 and the most vigorous rumination after 19:00. However, the periods of rumination in groups fed hay harvested at the heading stage were greater than in groups fed hay harvested at the boot stage. Unitary time of eating per 100g or 100KJ of ingested nutrients was longer in groups fed chopped hay than in groups fed unchopped hay harvested at both growth stages, but there were no significant differences (P$gt;0.05) except for crude protein (P$lt;0.05). Unitary time of rumination per 100g or 100KJ of ingested nutrient was all long in the group fed unchopped hay harvested at the boot stage (P$gt;0.05) but was little different at heading stage. Unitary rumination time was significantly longer (P$lt;0.05) in groups fed hay harvested at the heading stage than in groups fed hay harvested at the boot stage. Number of chews was more numerous in groups fed unchopped hay than in groups fed chopped hay harvested at both stages and that was also greater at the heading stage than at the booting stage, although there were no significant differences (P$gt;0.05). As time past, number of chews per bolus tended to decrease in groups fed hay harvested at the boot stage but tended to increase in groups fed hay harvested at the heading stage. The result of chewing time per bolus was similar to that of number of chews. Chewing speed obtained by dividing the number of chews by chewing time was faster in groups fed unchopped hay than in groups fed chopped hay during the whole period and was faster in groups fed hay harvested at the heading stage than in groups fed hay harvested at the boot stage. Chewing speed was also the fastest during the period of 11:00-17:00 and tended to decrease therefore in all groups. Consequently, it is considered that feeding behavior is largely influenced by quality, chopping and intake of roughage.
Sorghum × Sudangrass hybrid 의 입모저장에 관한 연구 ; 1 . 입모저장기간이 생육특성 및 기호성 변화에 미치는 영향
이상무 ( S M Lee ),문상호 ( S H Moon ),백인철 ( I C Baek ),전병태 ( B T Jeon ) 한국축산학회 1994 한국축산학회지 Vol.36 No.1
Growth characteristics and palatability by different harvesting dates were measured in order to determine its availability and effective storage period when sorghum × sudangrass hybrid were stored as foggage. Experiment was carried out with six treatments as follows; T1, T2 and T3 were foggaged at 120, 160 and 200㎝ in plant length and T4, T5 and T6 were foggaged at boot, milk and dough stage on 7 october after regrowth respectively. Rice straw was offered to examine the relative palatability a, control. 1. Growth characteristics such as plant length, leaf length, leaf width, leaf number and stem hardness were decreased with prolongation of foggage period at all treatments. Especially, decrease and falling ratio were a heigher at T5 and T6 than the other treatments. 2. Greeness grade of leaf showed fast decoloration at TI and T2 treatments, but stem showed fast decoloration at TS and T6 treatments. Leaf and stem decolorized in mid-October and mid-november in all treatments. 3. Leaf ratio was deceased with prolongation of foggage period, but stem showed gradually increase. Grain ratio was stable increase at T6 treatments, but not at T5 treatment, 4. Dry matter contents of leaf and grain were stable increased at all treatment but stem was multifarious according to weather conditions. 5. Changes of palatability were high at T1, T2 and T3 treatments untill mid-October, but T4 treatment and rice straw showed high in early December. 6. According to the results obtained in this study, it was suggested that when sorghum x sudangrass hybrid is used as foggage, foggaging period would be suitable until mid-november and growth stage for foggaging would be recommendable from T2 to boot stage for maximum availability.
완충지수곡선에 의해 평가된 옥수수 사일리지의 발효품질과 사료가치와의 관계
전병태,김경훈,문상호 ( B . T . Jeon,K . H . Kim,S . H . Moon ) 한국축산학회 1997 한국축산학회지 Vol.39 No.2
The present study was conducted to investigate the relationship between the feed value and fermentation quality of silage evaluated by the rapid titration method. The buffer index value was determined from the amount of 0.1N NaOH consumed in titration of each 0.5 pH step. Thirty four samples of com silage which had been collected from farms were assessed by deriving the buffer index curve. The silages were also analysed by the routine chemical methods for organic acids, dry matter, crude protein, crude fiber and ammonia-nitrogen. Degradability of silage dry matter was measured by incubating samples in nylon bags suspended in the rumen. Duplicated bags were removed at 12 and 24h postincubation. Each of fourteen silages had a same peak position at pH 4.0 on index curve (B type) and showed the characteristics of lactic acid fermentation. Twenty silages with a same position peak at pH 4.5 (C type) were moderately well preserved. The B type silages were higher in dry matter content and lower in crude protein and crude fiber contents compared to the C type silages. It should be noted that the B type silages were ensiled at more profitable maturation stage than the C type silages. Fourteen silages which had been selected randomly were deteriorated in aerobic phase to obtain the spoiled silages. By the results of titrating those extract juice, all of the silages had the same peak positions at pH 5.0 on each buffer index curve (D type) and showed significantly (P$lt;0.001) lower dry matter degarability than the B and C types. The results indicate that feed values of silage can be predicted by the rapid titration method.
대전력 3상 유도전동기의 고정자권선을 이용한 전압원 인버터의 병렬운전
김보경(B. K. Kim),문상호(S. H. Moon),강성관(S. K. Kang),김인동(I. D. Kim),노의철(E. C. Nho),전성즙(S. J. Jeon) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
본 논문에서는 고압 대전력 3상 유도전동기의 고정자 권선을 이용한 전압원 인버터의 병렬운전 방식을 제안한다. 현재 사용되고 있는 대부분의 4극 이상 대전력 유도전동기는 각 상의 권선이 외부에서 접근이<br/> 가능하도록 외부단자가 설치되어 있으며, 이들 외부 단자를 이용하여 복수대의 전압원 인버터를 병렬운전하여 대전력 유도전동기를 구동할 수 있다. 이와 같이 고압 대전력 유도전동기를 복수 대의 전압원 인버<br/> 터를 병렬 운전하여 구동할 경우 , 특정 인버터의 고장발생 시 비록 구동 토크는 감소될지라도, 나머지 인버터로 시스템을 계속 구동할 수 있어 시스템의 고장대처능력을 향상시킬 수 있다. 또한 병렬 운전되고 있는 각 인버터의 스위칭 동작에 대해 서로 위상 차를 갖게 함으로서, 등가 스위칭 주파수를 증가시켜 출력 토크 리플 감소와 입력 전류 리플 감소 , DC Lmk 커패시터의 크기 감소와 같은 좋은 특성을 얻 을 수 있다. 또한 각 인버터로의 전력의 분산에 의해 시스템에서 발생하는 EMI 영향을 감소시킬 수 있다.<br/> 본 논문에서는 제안한 방식을 컴퓨터 시뮬레이션을 통해 특성을 증명하였다.