• Current Research on Agriculture and Life Sciences
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• 제7권
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• pp.47-53
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• 1989

감미종(甘味種) 고추의 육종재료(育種材料)로 사용(使用)하고저 미국(美國)과 일본(日本)으로 부터 도입(導入)한 피만계와 기타의 고추 품종(品種)을 포장(圃場)에 재식(栽植)하여 그 특성(特性)을 조사(調査)하였다. 수량(收量)에 있어서는 대사자(大獅子), 기옥조생(埼玉早生), 평안영광(平安榮光), 시장(市場) 등 일본(日本)에서 도입(導入)된 품종(品種)들이 상위(上位)에 있고 다음으로 Keystone Resistant Giant #3, Emerald Giant 등의 순으로 수량(收量)이 많았다. 일본(日本)에서 도입(導入)된 품종(品種)들은 수량(收量)이 많고 착과성(着果性)이 양호(良好)하였으나 과실(果實)은 비교적(比較的) 작았다. 미국(美國)에서 도입(導入)된 품종(品鍾)들은 수량(收量)과 초세(草勢)에서 일본(日本) 품종(品種)보다 떨어지나 대과(大果)를 생산(生産)하였다. 그중에서도 Keystone Resistant Giant #3, Yolo Wonder 계, Emerald Giant, Mercury 등의 과실(果實)이 가장 대과(大果)이었다. 피만계와 함께 재배한 Cubanelle, Sweet Banana, Anaheim, Cheny Sweet 등의 특성(特性)도 조사(調査)하고 그 용도(用途)에 대하여도 논(論)하였다.

• 대한한의학방제학회지
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• 제23권1호
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• pp.151-159
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• 2015

Objectives : This study was performed to investigate the effect of herbal steam therapy on peripheral facial paralysis. Methods : 55 patients with peripheral facial paralysis were treated with Korean Medicine therapy including herbal steam therapy. We evaluated the effect of Korean Medicine therapy including herbal steam therapy by Yanagihara grading system. Results : 1. 55 patients were treated with Korean Medicine therapy and 23.27±14.11 times of herbal steam therapy. 2. After treatment, Y-system score was significantly increased(p-value＜0.001) from 18.00±6.5514 to 35.00±6.3404. Conclusions : Herbal stream therapy seem to be effective to improve symptoms of peripheral facial paralysis. Further studies will be needed to identify the beneficial of herbal steam therapy on peripheral facial paralysis.

• 한국자동차공학회논문집
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• 제16권1호
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• pp.45-51
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• 2008

This paper presents theoretical and experimental analysis on the characteristics of the power spectrum of electormagnetic waves radiating from the spark plug and their cables of a distributorless ignition system. The theoretical study was conducted applying the microwave transmission line theory and the antenna theory. The experimental works were carried out to measure the standing wave ratio(SWR) and the radiation power spectrum of this system. As a result, it has been found that a spark plug and its cable is working as a monopole antenna radiating elelctromagnetic waves. Because of its similar structure to a monopole antenna, the envelope of radiation power spectrum distribution has a bell shape which can be obtained from a monopole antenna operating as a series resonant circuit. The frequency characteristics from the SWR measurements show a similar frequency characteristics of power spectrum of the system studied. Also, it has been found that the density of the power spectrum of the system fitting a long time used spark plug is higher than that of fitting a new spark plug.

• Ocean and Polar Research
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• 제32권2호
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• pp.113-122
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• 2010

Understanding the abundance and distribution of massive jellyfish is necessary to forecast where or when their blooms will happen. The acoustic technique is one of the most useful methods of obtaining information if the acoustic characteristics of the targets are known. This study was conducted to determine the acoustic target strength (TS, dB) of two jellyfish species, Aurelia aurita and Cyanea nozakii, in the southern coast of Korea. For the ex situ measurements, 120, 200, and 420 kHz split beam transducers were used, and jellyfish with various bell lengths were arranged to prepare multiple jellyfish. Under 2 vertical individuals, the mean TS for multiple A. aurita at 120, 200, and 420 kHz was -72.7, -71.7, and -68.2 dB, respectively. In the case of 5 vertical individuals, the mean TS of the species was -71.3, -68.2, and -62.0 dB. Finally, the mean TS of C. nozakii at 120, 200, and 200 kHz was -62.0, -60.3, and -58.2 dB under 2 individuals and -58.1, -57.4, and -54.0 dB under 4 individuals, respectively. For both species, higher numbers of jellyfish resulted in a higher TS. In addition, higher frequencies were associated with a higher TS for the same jellyfish. These TS results for two species can be used as essential data for the acoustic detection of jellyfish in an open ocean or coastal area.

• 한국항공우주학회지
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• 제43권4호
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• pp.311-317
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• 2015

본 연구는 공압시험용 핀틀추력기의 비정상상태 특성을 예측하기 위한 1-D 시뮬레이션 적용법을 기술한다. 추력을 제어하기 위해 질량유량, 챔버압력, 노즐출구 압력은 핵심 매개변수이다. 챔버압력은 핀틀 스트로크 변화에 따라 단조롭게 증감하였지만, 추력은 챔버 압력의 변화와 다른 양상을 보였다. 핀틀이 전진할 때 핀틀 속도와 챔버 자유체적이 특정 값을 초과하면 추력 값은 초기에 감소하다가 다시 증가하는 경향을 보였다. 1-D 시뮬레이션은 비정상 상태 특성을 예측하는데 한계가 있지만 실험이나 수치해석 이전에 듀얼벨 노즐과 같은 다양한 고도보정노즐 추력기의 초기 성능 평가에 여전히 유용하다.

• 대한물리치료과학회지
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• 제10권2호
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• pp.96-103
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• 2003

The purpose of this study was to assess the effect of applied pressure to abdomen on lumbar and abdominal muscle activation during upper limb exercise. The experimental group consisted of twenty-seven healthy male subjects (mean age=$22.40{\pm}2.19years$, mean height=$175.30{\pm}2.19cm$, mean weight= $67.67{\pm}7.44kg$, RM=$8.43{\pm}2.76kg$). In each different pressure condition (OmmHg, 30mmHg, 70mmHg, 100mmHg), upper limb exercise was performed in total of 10 trials with 10 RM dumb-bell exercise. Lumbar and abdominal muscle activity was measured using surface bipolar electrode electromyography(EMG). EMG activity was measured from upper rectus abdominis, external oblique abdominis, internal oblique abdominis, and elector spinae. The raw EMG signal was processed into the root mean square(RMS). All RMS EMG data were normalized and express as a percentage of the EMG(%EMG). Collected data were statistically analyzed by SPSS/PC Ver 10.0 using two-way analysis of variance for repeated measures($4{\pm}3$) and Bonferroni post hoc, test. Lumbar and abdominal muscle activation was significantly increased when 100 mmHg was applied(p<.05). Upper rectus abdominis activation was significantly increased compared as other muscles activation(p<.05). However, there were no interaction between pressure and muscles(p>.05). The findings of this study can be used as a fundamental data when lumbar orthosis is applied and external pressure can be used as a therapeutic tool.

• 대한수학회지
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• 제45권3호
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• pp.727-740
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• 2008

A ring R is called IFP, due to Bell, if ab=0 implies aRb=0 for $a,b{\in}R$. Huh et al. showed that the IFP condition need not be preserved by polynomial ring extensions. But it is shown that ${\sum}^n_{i=0}$ $E_{ai}E$ is a nonzero nilpotent ideal of E whenever R is an IFP ring and $0{\neq}f{\in}F$ is nilpotent, where E is a polynomial ring over R, F is a polynomial ring over E, and $a_i^{'s}$ are the coefficients of f. we shall use the term near IFP to denote such a ring as having place near at the IFPness. In the present note the structures of IFP rings and near-IFP rings are observed, extending the classes of them. IFP rings are NI (i.e., nilpotent elements form an ideal). It is shown that the near-IFPness and the NIness are distinct each other, and the relations among them and related conditions are examined.

• 한국미생물·생명공학회지
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• 제19권1호
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• pp.31-36
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• 1991

Tn5의 kanamycin 저항성 유전자를 가진 pBEL1 plasmid와 C.glutamicum cryptic plasmid인 pSR1으로 7.5kb의 새로운 plasmid를 만든 후, 이를 pCE1301이라 명명하였다. 이 pCE1301은 PEG1301은 PEG-protoplast법으로 C.glutamicum을 형질전환하였을 때 효율이 약 $3.0\times 10^3$형질전환제/$\mu g$이었으며 SalI과 EcoRI 제한효소 절단부위가 1개씩이었다. 또 Km이 없는 배지에서 25세대까지 안정하게 유지되었으며 B.flavum, E.coli에서 복제되었다. 이 pCE1301을 이용하여 C.glutamicum 의 homoserine dehydrogenase 유전자를 cloning하였다.

• 한국미생물·생명공학회지
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• 제19권1호
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• pp.37-44
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• 1991

진핵세포 유전자의 기초대사발현의 조절계를 밝히기 위한 일환으로, 효모의 histidine생합성계 효소의 구조유전자 HIS5를 이용하였다. HIS5 유전자는 충분한 아미노산 조건하에서는 발현이 억제되어 비교적 높은 기초발현만을 하나, 어떤 아미노산이 결핍되면 탈억제되어 높은 발현량을 보이며 탈억제는 cis의 작용인자인 promoter상의 5'-TGACTC-3' 및 trans 작용인자 GCN4와 GCD17 GCN2등이 관여한다. trans 작용인자들에 의한 HIS5 유전자의 발현량의 변화를 간단하게 측정하기 위하여, HIS5 promoter와 repressible acid phoshates(APase)의 구조유전자중 promoter를 제거한 DNA단편을 연결시켜 HIS5-PHO5 융합유전자를 이용하였다. gcn2 및 gcn4 변이주의 APase 활성은 야생주와 비교하여 3내지 4배 낮았으며, gcn2변이주와 gcn2 gcn4 이중변이주의 APase 활성은 유사하였다.

• 기술사
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• 제24권6호
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• pp.106-112
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• 1991

Electronics has different meanings to different people and in different countries. Hence, let me difine the term in the sense that it is used here. Electronics in the science and the technology of the passage of charged particles in a gas, in a vacumn, or in a semiconductor. The beginning of electronics came in 1895 when H. A. Lorentz postulated the existence of discrete charges called electrons. Two years later J.J. Thompson found these electrons experimentally. In the same year (1897) Braun built what was probaly the first electron tube, essentially a primitive cathode-ray tube. It was not until the start of the 20th century that electronics began to take technological shape. In 1904 Fleming invented the diode which he called a valve. This era begins with the invention of the transistor about 30 years ago. The history of this invention is interesting. M.J. Kelly, director of research(and later president of Bell Laboratories), had the foresight to realize that the telephone system needed electronic switching and better amplifiers. Vacuum tubes were not very reliable, principally because they generated a great deal of heat even when they were not being used, and, particularly, because filaments burned out and the tubes had to be replaced. In 1945 a solid-state physics group wa formed. The foregoing completes the history of electronics and electronic industries up to 1978. There is already a start toward a merging of the computer and the communication industries which might be called information manipulation. This includes storage of information, sorting, computation, information retrieval, and transmission of data. This combination of the computer and the communication fields will penetrate many disciplines. Applications will be made in the fields of law, medicine, biological sciences, engineering, library services publishing banking, reservation systems, management control, education, and defense.