• 소성∙가공
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• 제29권1호
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• pp.27-36
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• 2020

The Goss texture component of {110}<001> is well known as one of the best texture components to improve the magnetic properties of electrical steel sheets. The small amount of the Goss texture component is obtained at the surface of the steel sheet by shear deformation due to friction between the steel sheet and the roll during conventional symmetric rolling. This study aims to identify a method to obtain high intensity of the Goss texture component not only at the surface but in the whole layer of the steel sheet by shear deformation of asymmetric rolling. Low carbon steel sheets, which have different initial texture, were asymmetrically rolled by about 50%, 70%, and 80%. The pole figures of the top, center, and bottom layers of the initial and asymmetrically rolled low carbon steel sheets were measured by an X-ray diffractometer. Based on the measured pole figures of these samples, the intensities of the main texture components were analyzed for the initial and asymmetrically rolled low carbon steel sheets. As a result, the initial low carbon steel sheet with the γ-fiber component showed a higher intensity of the Goss texture component in the whole layer than the steel sheet with other texture components after asymmetric rolling.

• Journal of Ginseng Research
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• 제22권2호
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• pp.73-81
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• 1998

In order to stabilize the price of fresh ginseng by extension of seasonal variation and marketing structure, and to reduce the cost of production by works of intensive and short term, studies were carried out. As fresh ginseng of 4 years old by the MA (modified atmosphere storage) and CA (controlled atmosphere storage) was stored for 12 week at 4$^{\circ}C$, samples were collected after every 1, 2, 3, 4, 6, 8, 12 weeks for processing red ginseng. Chemical characteristics on ginseng steamed red for the quality evaluation are summarized as follows. The composition of free sugar was consisted of fructose, glucose, sucrose, and maltose in fresh ginseng. And small change was revealed in free sugar composition during the storage period. Glucose and sucrose were largely increased in both treatments of MA (modified atmosphere storage) and CA (controlled atmosphere storage) after 4 week, wherein maltose was decreased. Fifteen different amino acids were identified, and total amount of histamine and arginine were over 40%. Phenylalanine was slightly decreased. As the volatile components in control red ginseng, six different ones including triisopropyl benzene were detected. B-1 ($CO_2$ : $O_2$ : N2=6 : 4.90, DF-100) of CA and E-1 (CPP, DF-100) of MA did not shown triisopropyl benzene as the volatile components. And ${\gamma}$-muurolene, guaiaene, and beta-patchoulene were reduced, but the other components showed the trend of increase.

• 대한약리학회지
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• 제10권2호
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• pp.39-42
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• 1974

Despite a considerable amount of investigation there continues to be disagreement concerning the proteins present in human seminal plasma. Recently their identification has assumed a greater importance following evidence that infertility in men and women may have an immunological cause (Katsh, 1959; Quinlivan, 1969). Seminal plasma is composed of fluids secreted by the prostate, seminal vesicles, ampullae, ducti deferentes, bulbourethral (Cowper's) glands, urethral(Littre's) glands and the epididymes. Prostatic juice, one of the major components of seminal plasma, has an important role in secretion of acid phosphatase and prostaglandin. A few studies have been reported of human prostatic juice, since, in human subjects, there were some problems in studying prostatic juice due to quite small amount of secretion and possibility of contamination with fluids from the seminal vesicles and ejaculatory ducts. The purpose of the present study was to determine the basic components of proteins in human prostatic juice. Prostatic juice was obtained from normal healthy man of $20{\sim}30\;year-old$ by massage of the prostate, and protein components were separated by means of disc electrophoresis. The results are summarized as follows; 1) Total numbers of protein fractions of normal human serum and prostatic juice are $14{\sim}18$ bands and $9{\sim}12$ bands, respectively. Prostatic juice produces two deeply staining bands which appear similar to those formed by $beta-_1$ globulin and albumin. 2) $Alpha-_1$ globulin area in the fractions of prostatic juice shows 4 bands and one more band is found than that of serum. On the other hand, the fractions of immunoglobulin and $alpha-_2$ globulin areas are eight in serum and it has three bands more than that of prostatic juice. 3) $Alpha-_1$ globulin area in the prostatic juice is more deeply stained than that of serum. In contrast with $alpha-_1$ globulin area, immunoglobulin and $alpha-_2$ globulin areas in the prostatic juice show weaker staining than serum.

• 한국연초학회지
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• 제10권1호
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• pp.75-82
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• 1988

Cigarettes were made using a triple filter with several porous materials in its cavity. The removal effect of the adsorbents on carbon monoxide and hydrogen cyanide in cigarette smoke was investigated with the variation of their surface area and pore volume distributions. Several attempts were made to activated coconut shell based char under the fixed steam purging rate. 1. The specific surface area increased in number of micropore. It was found for transitional pore to have a little effect on the total surface area. 2. A Small amount of the particulate matter adsorbed on the adsorbents with transitional pores, Zeolite showed a little effect on the carbon monoxide adsorption though its small pore volume, but there was no significant difference in the adsorption capacity zeolite and the others. 3. In the adsorption for hydrogen cyanide as a vapor phase in cigarette smoke, the adsorption effect of the adsorbents increased remarkably with increasing their surface area and number of micropore. It was considered that the adsorbents with small pore volume like molecular seive 4A, in which the capillary diffusion of adsorbates could not be able, would not be effective for the adsorption of hydrogen cyanide.

• 대한기계학회논문집B
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• 제29권2호
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• pp.271-278
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• 2005

In this paper, the performance of Kim-chi refrigerator with three evaporator and one compressor was investigated in employing $55\%$ propane and $45\%$ isobutane (R290/R600a) refrigerant mixture as an alternative refrigerant of R134a. The drop-in test was performed by varying both refrigerant charge and capillary tube length in order to find both the performance and reliability of a small multi-refrigeration system. Results show that the power consumption is decreased by about $15\%$ and COP is increased by about $10\%$, respectively as compared to the baseline system using R-134a. In addition, the propane/isobutane refrigerant mixture system took advantage of the minimization of modification and redesigning of system components because thermodynamic properties such as saturation pressure, temperature, normal boiling point(NBP) characteristics are similar to those of R134a. The reduction of sales cost is caused by the decrease of refrigerant cost per unit mass and refrigerant charge amount necessary for the refrigeration system.

• 한국분무공학회지
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• 제27권3호
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• pp.155-160
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• 2022

Recently, major developed countries have strengthened automobile fuel efficiency regulations and carbon dioxide emission allowance standards to curb climate change caused by global warming worldwide. Accordingly, research and manufacturing on electric vehicles that do not emit pollutants during actual driving on the road are being conducted. Several automobile companies are producing and testing electric vehicles to commercialize them, but it takes a lot of manpower and time to test and evaluate mass-produced electric vehicles with driving mileage of more than 300km on a per-charge. Therefore, in order to reduce this, a simulation model was developed in this study. This study used vehicle information and MCT speed profile of small electric vehicle as basic data. It was developed by applying Simulink, which models the system in a block diagram method using MATLAB software. Based on the vehicle dynamics, the simulation model consisted of major components of electric vehicles such as motor, battery, wheel/tire, brake, and acceleration. Through the development model, the amount of change in battery SOC and the mileage during driving were calculated. For verification, battery SOC data and vehicle speed data were compared and analyzed using CAN communication during the chassis dynamometer test. In addition, the reliability of the simulation model was confirmed through an analysis of the correlation between the result data and the data acquired through CAN communication.

• 한국산학기술학회논문지
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• 제21권12호
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• pp.261-267
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• 2020

휴대용기기에 대한 경박단소 및 빠른 속도에 대한 요구는 반도체 패키징 기술에도 변화를 가져왔다. 이에 대한 대응의 하나로 stacked chip scale package(SCSP)가 업계에서 사용되고 있다. SCSP를 구현하기 위한 핵심소재 중의 하나가 die attach film(DAF)이다. 특히, 다이와 기판을 접착하거나 다이와 다이를 접착하는 경우, DAF의 접착필름은 기판의 단차나 본딩 와이어 사이를 기공의 발생 없이 채우기 위해 우수한 고온 유동성이 요구된다. 그러나 이 경우 경화 크랙의 발생을 최소화하기 위해 2단계 경화가 종종 요구되나, 공정시간 단축을 위해서는 1단계 경화가 바람직하다. 본 연구에서는 DAF 접착필름의 조성물을 경화 성분(에폭시 수지), 유연 성분(고무성분), 딱딱한 성분(페녹시수지, 실리카), 3개 군으로 분류하고, 조성물의 변화에 따른 1단계 경화시 경화 크랙, 고온 유동성, die attach (DA) 기공발생에 대한 영향을 혼합물 실험 설계법를 통해 살펴보았다. 경화 크랙은 딱딱한 성분 함량에 가장 크게 영향을 받았으며, 함량이 증가할수록 경화 크랙이 감소하였다. DA 기공의 발생은 딱딱한 성분의 함량이 감소할수록 감소하였으며, 특히, 딱딱한 성분의 함량이 적은 경우는 경화 성분의 함량이 감소할수록, 기공의 발생이 억제되었다. 고온 유동성은 100℃ 저장탄성 계수와 120℃에서의 블리드 아웃(BL-120)으로 평가되었다. 100℃의 고온 저장탄성률은 딱딱한 성분의 감소가 중요하였고, 유동성 지표인 BL-120의 경우는 경화 성분의 함량의 증가와 딱딱한 성분의 감소가 동시에 중요하였다.

• 한국식품과학회지
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• 제20권3호
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• pp.293-302
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• 1988

본 연구는 모과의 비휘발성 성분에 과한 조성을 규명하기 위한 기초 연구 과제로써 행하여졌다. 주요 비휘발성 성분은 유리 아미노산의 경우 valine, asparagin ${\gamma}-aminobutyric\;acid$, aspartic acid 와 serine 이 전체의 72%를 차지하고 arginine, tyrosine, methionine과 tryptophan은 거의 검출되지 않아다. Peptide 구성 아미노산으로는 주로 glutamic acid와 glutamine이었으며 cysteic acid, methione sulfone과 tryptophan은 검출되지 않았다. 핵산관련 물질의 분석 결과 cytosine, UMP, CMP는 소량 존재하셨으며 GMP, IMP, AMP는 검출되지 않았다. 당 분석결과 주성분은 glucose, sorbose, sucrose, fructose였으며 fructose 함량이 가장 높은 것으로 판명되었다. GC 및 GC-MS방법에 의해 총 11성분의 유기산이 동정 되었으며 이들중 tartaric acid및 ${\alpha}-ketoglutaric\;acid$가 주성분이었다. 정량된 총 비타민 C 함량은 386.6 mg%였으며 ascorbic-acid dehydroascorbic acid와 2,3-diketo-L-gulonic acid는 각각 28.8mg%, 154.5mg%, 197.3mg%였다. 무기성분으로는 칼슘과 인이 주요 성분으로 나타났으며 카드뮴, 구리, 납은 소량 존재하였다. 모과의 천연 및 합성 extract에 대한 관능검사의 결과 유리형, 아미노산, 당, 유기산, 비타민 C및 무기질의 맛의 주성분으로 판명되었다. 따라서 모과의 향미 성분 중 비휘발성 성분은 주로 상기 다섯 그룹에 의해서 나타남을 확인하였다.

• Journal of Crop Science and Biotechnology
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• 제10권3호
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• pp.193-200
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• 2007

Mungbean plants generally have a relatively close canopy, thus a large amount of self-shading can reduce yield due to poor light penetration. Modification of leaflet type can affect leaf canopy and could alter seed yield. Two multiple leaflet mutants were obtained from gamma-ray irradiation and used to study the mode of inheritance related to leaflet types and to evaluate their agronomic features. The cross between large-heptafoliate leaflet with small-pentafoliate leaflet mutants produce all $F_1$ plants with normal trifoliate leaflets. The $F_2$ plants segregated in leaflet size and leaflet number into a 9:3:3:1 ratio of large-trifoliate: large-heptafoliate: small-pentafoliate: small-heptafoliate plants, suggesting that independent loci control leaflet size and leaflet number. Regarding leaflet number, the $F_2$ population can be classified into normal-trifoliate, small-pentafoliate, large-heptafoliate, and small-heptafoliate at the dihybrid ratio of 9:3:3:1. The gene symbols $N_1,n_1$ and $N_2,n_2$ are proposed to represent leaflet number. Since no plant was found with large-pentafoliate leaflets, we hypothesize that the $N_2$ allele expresses pleiotropic effect on both leaflet number and leaflet size. Another possibility is that an additional locus with S and s alleles controls leaflet size and S is tightly linked with $N_2$. The effect of multifoliate leaflet on yield and yield components was evaluated in four mungbean families each with four leaflet isolines under three environments. Averaging across the families and environments, the normal-trifoliate and large-heptafoliate lines gave higher yield than small pentafoliate and heptafoliate ones. These two large leaflet lines also had higher leaf area per plant than the other multifoliate lines. Therefore, the mungbean lines with a greater leaf area, which were likely to intercept more sunlight, gave greater yield. Three AFLP markers that were found to be linked to number of leaflets per leaf, corresponded to the N1 allele of the smallpentafoliate parent.

• Applied Biological Chemistry
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• 제16권1호
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• pp.49-52
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• 1973

한국에서 널리 식용(식용)하고 있는 동태와 조기의 생어(생어)와 건어(건어)의 정미성분중(呈味成分中) 16종(種)의 유리(遊離) amino 산(酸)을 건물량(乾物量)으로 환산(換算) 비교(比較)한 결과(結果)는 다음과 같다. 1) Arginine은 극미량(極徵量)만이 검출(檢出)되였고 Lysine, Histidine, Glycine, Alanine, Glutamic acid 등(等)은 비교적(比較的) 많았다. 2) 건어(乾魚)로 하였을 때 Lysine은 감소(減少). 하였으며 Methionine은 동태에서 감소(減少), 조기에서는 증가(增加)하였고 타성분(他成分)들은 차이(差異)는 있으나 모두 증가(增加)하였다. 3) 조기와 동태의 유리(遊離) amino 산(酸) 함량(含量)은 조기가 높았다. 4) 정미성분(呈味成分)으로서 유리(遊離) amino 산(酸)의 영향(影響)만을 고려(考慮)한다면 생어(生魚)보다 건어(乾魚)의 맛이 농후(濃厚)하다.