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다차원 뉴튼-랩슨 방법을 이용한 하드 디스크/헤드 시스템의 3차원 평형위치 검색
장인배 江原大學校 産業技術硏究所 1995 産業技術硏究 Vol.15 No.-
This paper suggests the three dimensional steady state searching techniques of hard disk/head system, which has some skew angle with flexure. In order to analyze the steady state behaviors of magnetic head slider, the localized Knudsen number and the localized bearing numbers are sued. For finding the steady state of magnetic head slider under the pre-loaded condition, I proposed multi-dimensional Newton-Raphson method which traces the equilibrium position of magnetic head slider, which has 3-degrees of freedom, using Jacobian matrix. The multi-dimensional Newton-Raphson method is very efficient technique for finding the steady state position of magnetic head slider because it approaches to the equilibrium position with changing three parameters simultaneously.
장인배,한동철 한국소음진동공학회 1995 소음 진동 Vol.5 No.1
In this study, we investigated the operational limit of magnetic bearing-rotor system due to the maximum force limit and slew rjate limit of the electromagnetic actuator as a function of the time dependent control characteristics. The feedback gain of the controller varies the current of the electromagnet coil with the motion of the rotor. The distorsion of magnetic force due to the slew rate limit is not occurred jup to 30, 000 rpm in the magnetic bearing that we have a close relation with the rotational speed and vibration level of the rotor and the proportional gain of the controller. Therefore the maximum force limit determines the maximum allowable orbit radius of the magnetic bearing-rotor system. The maximum allowable vibration levels are exponentially decreased according to the increment of rotational speed and proportional gain of the controller.
수확시기에 따른 새싹삼의 부위별 생육 및 Ginsenoside 함량 변화
장인배,유 진,서수정,장인복,권기범 한국약용작물학회 2018 한국약용작물학회지 Vol.26 No.3
Background: Since the revised Ginseng Industrial Act was passed, ginseng sprouts have become a new medicinal vegetable for which there is high consumer demand. However, the existing amount of research and data on ginseng production has not kept pace with this changed reality. Methods and Results: In this study we analyzed the changes in the amounts of ginsenosides in different parts of growing ginseng sprouts during the period from when organic seedlings were planted in nursery soil until 8 weeks of cultivation had elapsed, which was when the leaves hardened. In the leaves, ginsenoside content increased 1.62 times with the panaxadiol (PD) system and 1.31 - 1.56 times with the panaxatriol (PT) system from 7 to 56 days after transplantation. During the same period, the total ginsenoside content of the stems decreased by 0.66 - 0.91 times, and those of the roots increased until the 21st day, and then underwent steep declines. The effect of fermented press cake extract (FPCE) and tap water (TP) on the total amount of ginsenoside per plant were similar, and could be represented with the equations y = 1.4330 + 0.2262x - 0.0008x2 and y = 0.9555 + 0.2997x - 0.0031x2 in which y = ginsenoside content x = amount of and on the total amounts of FPCE or TP, respectively after 26.4 days, however, the difference between ginsenoside content with FPCE and TP widened. Conclusions: These results suggested that the amounts of ginsenosides in different parts of ginseng varied with the cultivation period and nutrient supply. These findings also provide fundamental data on the distribution of ginsenosides among plant parts for 2- year-old ginseng plants in the early- growth stage.
장인배,도경란,Hyunseung Hwang,서수정,Jin Yu,장인복,문지원,Changhoo Chun 한국원예학회 2021 Horticulture, Environment, and Biotechnology Vol.62 No.4
To determine the optimal light intensity and enable plants to cope with various environmental stresses in plant factories, the morphological and photosynthetic characteristics of ginseng seedlings, including the secondary metabolites, were investigated under six light intensities: 25, 50, 75, 100, 125, and 150 μmol m−2 s−1. The shoot length increased with lower light intensity up to 75 μmol m−2 s−1, and the leaf area and specific leaf weight were greatest at 100 and 75 μmol m−2 s−1, respectively. Stomata frequency was higher from 100 μmol m−2 s−1 with higher light intensity, and single stomatal pore length also increased at 150 μmol m−2 s−1. Net photosynthetic rate at light saturation and net photosynthetic rate in growth condition increased sequentially up to 100 μmol m−2 s−1 before rapidly decreasing at 150 μmol m−2 s−1. The dark respiration rate and light compensation point were significantly high at 150 μmol m−2 s−1 only. Fv/Fm and chlorophyll content statistically differed from 63 and 84 days after seedling stand, respectively. Thus, the leaves withered to death with higher light intensity. The ginsenoside content in the roots significantly increased according to the light intensity, and the panaxadiol/panaxatriol (PT) ratio tended to decrease as the PT-type ginsenosides increased further. Taken together, the range of 75–100 μmol m−2 s−1 was found to be beneficial for growth, photosynthetic acclimation response, and total accumulated ginsenosides of ginseng seedlings.
장인배,도경란,서수정,Jin Yu,장인복,문지원,Changhoo Chun 한국원예학회 2020 Horticulture, Environment, and Biotechnology Vol.61 No.4
Ginseng, a semi-shade perennial plant, is greatly aff ected by light. However, light quality has only been studied in a fewpapers involving growth tests under monochromatic light or based on hairy root cultures. A plant factory with light-emittingdiodes (LEDs) may provide high precision and standardization of ginseng seedlings for transplanting, and plant responsesto light quality should be investigated for designing the optimal lighting conditions for this environment. In this study, variousratios of red light (R):blue light (B) were set from 100:0 to 0:100% at the same photosynthetic photon fl ux density of75 μmol m −2 s −1 . As R increased, the shoot length became longer from R75B25, resulting in the single treatment of R being1.68 times that of B. Compared to monochromatic R or B treatments, the overall growth of ginseng seedlings in R50B50treatment increased. In the mesophyll structure, mixed light as R50B50 or while LEDs increased starch grains, and onlyR treatment led to dense chloroplasts in palisade and spongy parenchyma cells. Increasing R ratios had negative eff ects onCO 2 assimilation rate ( A N ), light-saturated net photosynthesis rate ( A sat ), and chlorophyll parameters. The higher the R ratio,the higher the ginsenoside content in leaves, while roots were less aff ected by spectral changes. Monochromatic R inducedmalformation and senescence of ginseng leaves, while the addition of 25% B was suffi cient to prevent the abnormal developmentof leaves and dysfunctional photosynthetic operation of ginseng seedlings. The results suggest that combinations ofR and B should be considered when designing artifi cial lighting systems for a closed-type plant factory since R aff ects themorphological characteristics and ginsenoside content of ginseng seedlings.
마그네틱 헤드 슬라이더의 極小 空氣膜에 대한 定常狀態 解析
장인배,한동철 대한기계학회 1989 대한기계학회논문집 Vol.13 No.4
This paper analyze the steady state performance of a self-acting air lubricated slider bearing in hard disk/head system. Modified Reynolds' equation is derived from the steady state compressible Navier-Stokes equation, under slip-flow conditions. Finite difference technique and numerical procedure are described by using Newton-Raphson iteration method to slove the non-linear equations. These techniques are applied to conventional slider bearings and the effects of molecular mean free path(MMFP) for a recording surface of hard disk are shown. The calculation procedure developed here, wide applicabilities in practical head design procedures, and converges rapidly.