• Parasites, Hosts and Diseases
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• 제22권2호
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• pp.181-189
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• 1984

우리나라산(전남 강진 및 경남 금해시)미꾸리에서 이전고무극구흡충(Echinostoma cinetorchis)의 피낭유충을 처음으로 검출하고 횐쥐에 감염시킨 후 성충을 얻어 종을 확인하였다. 또, 미꾸리의 피낭유충 감염상황과 횐쥐에서의 간단한 발육과정을 관찰하였다. 결과를 요약하면 다음과 같다. 1. 미꾸리 46마리중 5마리 (10.9%)에서 담낭유충이 검출되었고 감염된 미꾸리당 감염대은 평균 34.4개이었다. 피낭유충은 미꾸리의 후복벽에서만 발견되었다. 2. 실험감염 횐쥐에서 감염 6∼28일까지 총 충체회수률은 24.6%이었으며 감염기간이 길어짐에 따라 회수률은 감소되었다. 3. 충체는 두증과 두련(37∼38개)이 뚜렷하고 고환이 이전하거나 소실되는 점으로 보아 E. sinetorchis Ando et Ozaki, 1923로 동정되었다. 4. 충체의 발육은 감염6일부터 10일 사이에 가장현저하였으며 이 기간중 특히 생식기관의 발육이 비생식기관에 비해 빠르고 현저하였다. 이상의 결과로 볼 때 우리나라에서 미꾸리가 이전고구극구흡충의 제이중간숙주 역할을 하고 있음이 입증되었고 실험적으로 얻은 성충의 형태에서 고구의 이전 또는 소실이 종의 특성임이 재확인되었다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.565-569
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• 2004

The wing-body trucks are special vehicles that are designed to provide large carrying space and to protect the freights from outside impacts and bad weather. They are constructed to the structure opening and shutting three-layered aluminum top. In the middle- and large-size(above one-ton) wing-body trucks, wing-body is opened/closed by opening and shutting device of oil pressure type. But one-ton truck is constructed that its wing-body is opened/closed in manual to use helping of stay-dampers. So, we developed an electronic opening and shutting device for one-ton wing-body trucks to improve the inconvenience of usage for manually operated wing-body. The developed device is consisted of two connected links and a dc motor combined with an worm gear. The worm gear changes the rotation axis of the dc motor to a right-angled direction and transfers the torque of dc motor to the links. The two connected links open/shut the wing-body using the torque transferred from the dc motor. When the wing-body starts to be opened, the biggest torque is required from the dc motor for opening the wing-body. And as the wing-body is opened more and more, the required torque is smaller for opening the wing-body. Thus, the structure of two connected links are designed to locate at the center of worm gear so that maximum torque of the dc motor is transferred the links at the initial time starting to open wing-body. The controller of the device with open and closed buttons also is designed to protect the device from over-opening and over shutting operations. The developed device is accomplished for many experiments using actual vehicle. Those experiments show that the device has more excellent performance than the oil pressure type.

• 한국잠사곤충학회지
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• 제3권
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• pp.23-28
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• 1963

(1) 산란후 유정란의 RNA량은 계속 증가하여 제 5일에 최고 (제 1일의 약 2.1배)에 달하고 제 6일부터 약간 감소된다. 이와 같은 RNA 량의 변동은 잠란의 배자형성 및 발육과 밀접한 관계가 있는 것으로 생각된다. (2) 무정란의 RNA 량은 산란직후부터 유정란의 그것에 비하여 대단히 적고 (약 절반임) 제 4일까지 약간의 증가를 보이나 제 5일부터 감소한다. (3) 조사유정란은 방사선조사(3,000 r)후 제 2일까지는 RNA 량이 약간 증가하나 그 후부터는 별 변동이 없다. 즉 방사선 조사로 란 RNA 합성이 크게 억제됨을 알 수 있다.(4) 침산처리란은 침산처리 제 4일부터 RNA 량이 격증하여 부화 1일 전인 제 7일까지 계속된다. 비침산란은 해기간중 RNA 량의 변동이 거의없다. 조사침산처리란 (1,500 r)에 있어서는 조사후 제 3일까지는 비조사란과 달라 RNA 량이 감소되었다가 제 4일부터 격증하여 제 7일까지 계속된다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.372-376
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• 2004

With the growing traffic density and increasing comfort requirements, the automation of the drive train will gain importance in vehicles. The automatic clutch actuation relieves the drivers especially in urban driving and stop-and-go traffic conditions. In this paper, an electro-mechanical actuator for clutch-by-wire (CBW) system is implemented as the first stage for the development of automated manual transmissions. The prototype of CBW actuator is designed systematically, which is composed of the electric motor, worm & worm wheel and crank mechanism. And the test rig is developed to perform the basic function test for the automatic clutch actuation. The developed prototype is validated by the experimental results on the test rig.

• 한국임상수의학회지
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• 제21권3호
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• pp.248-252
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• 2004

DNase activity from infective larvae of the parasitic nematode Haemonchus contortus was characterized and compared to that from whole worm. DNase activity from infective larvae was detected throughout pHs 4-10, but high activity was detected under acidic conditions. The activity was not inhibited by 10 mM EDTA at pH 5.0, but was significantly inhibited at pH 7.0. The activity produced DNA, fragments with mixtures of 3'-hydroxyls (OH) and 3'-phosphates (P) at each pH with predominance of 3'-P. A unique DNase activity at 37 kDa was identified from infective larvae on zymograms. The 37 kDa DNase was detected only at pH 5.0, but not at pH 7.0, and this activity was not inhibited by EDTA at pH 5.0. These characteristics of the 37 kDa infective larval DNase resemble those of classic acidic DNases (e.g., DNase II). In contrast, 34, 36 and 38.5 kDa DNase activities were shown to be specific for whole worm. This result demonstrated that DNases in H contortus are regulated during development.

• Journal of Biosystems Engineering
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• 제22권4호
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• pp.497-502
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• 1997

Automation facilities of greenhouses have been continuously developed. However, the conventional two-stage worm gear reducer reveals some problems, including low transmission efficiency. The worm gear reducer also have some difficulties in manufacturing and short life. Therefore, this study was performed to develop a planetary gear reducer, having a high Sear reduction ratio and high torque transmission efficiency. The planetary gear system consisted of a fixed ring gear and a 2-teeth differential ring gear turning slow, as the planetary pinion orbits fast around the fixed ring gear. The developed gear system can achieve a high speed reduction rate at one stage. The reducing system was employed to the greenhouse ventilation system. The reducer has the transmission efficiency of 70.5%, 2∼3 times longer life time, and twofold roll-up torque at an affordable price, comparing with conventional reducers. This reducer can be also applied to many industrial equipments, such as industrial crane, hoist, elevator and gondola etc.

• 한국토양동물학회지
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• 제7권1_2호
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• pp.29-34
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• 2002

Hox genes are a family of regulatory gene encoding transcription factor that primarily play a crucial role during development. Several indications suggest their involvement in the control of cell growth and regenration. RT-PCR and souther blot analysis revealed that labial-like gene was increasingly expressed along a spatial gradient in the anterior region of intact worm. During head and tail regeneration, labial-like gene was expressed only in the head region of regenerating body pieces, suggesting that the gene is involved in the anteroposterior patterning in earth-worm. This result could give us information on the significance of Hox genes and the relationship between Hox genes during regeneration.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2011년도 춘계학술대회 논문집
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• pp.413-414
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• 2011

• Parasites, Hosts and Diseases
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• 제34권1호
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• pp.21-26
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• 1996

우리 나라 고유의 인체 기생 장흡충의 하나인 참굴큰입홉충(Gvmophono천es seoi) 피낭유충에 대한 방사선 조사가 실험적 종숙주인 C3H 마우스 감염 능력에 어떠한 영향을 미치는지 관찰하였다. 유행지에서 굴을 채집하여 비조사 대조군 피낭유충 소사군 및 굴 조사군 등 3개 군으로 나누고, 각 군에서 얻은 피낭유충을 C3H 마우스 마리당 각각 100개씩 경구감염시킨 다음 7일째에 충체 회수율을 관찰하였다. 연구 결과, 피낭유충 조사군에서는 200 Gy 이상 조사시 대조군에 비해 유의하게 충체 회수율이 감소하였다. 생존 충체의 자궁 내 충란수는 50 Gy 이상 조사시 통계적으로 유의한 감소를 보였다. 굴 조사군에서는 50 Gy 이상 조사시 충체 회수율이 유의하게 감소하였으며 50 Gy 이상 조사시 자궁내 충란수의 유의한 감소를 보였다. 이상의 결과를 종합할 때 굴에 200-1 000 Gy를 조사할 경우 참굴큰입흡충 피낭유충의 갈멸 효과가 뚜렷하였으며, 따라서 이 흡충증 관리 방법의 하나로 이용할 수 있을 것으로 전망하였다.

• Parasites, Hosts and Diseases
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• 제37권1호
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• pp.13-19
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• 1999

The effects of in vitro culture methods on morphological development and infectivity of Strongyloides venezuelensis filariform larvae ($L_3$) to rats were investigated. A significantly higher body length was observed in $L_3$ from filter paper culture ($597.3{\;}{\pm}{\;}32.2{\;}{\mu\textrm{m}}$) than those in fecal (($509.9{\;}{\pm}{\;}35.0{\;}{\mu\textrm{m}}$) and nutrient broth culture (503.3{\;}{\pm}{\;}31.0{\;}{\mu\textrm{m}}) (P<0.05). Larval infectivity was assessed by exposing rats to 1,000 $L_3$ from each culture and worms were recovered from the lungs and small intestines. Recovery rate of these worms did not show any significant difference. A significantly greater body length of adults was recorded in those corresponding to the $L_3$ harvested from filter paper (2,777.5{\;}{\pm}{\;}204.4{\;}{\mu\textrm{m}}$) and nutrient broth culture (($2.732.5{\;}{\pm}{\;}169.8{\;}{\mu\textrm{m}}$) than those corresponding to the $L_3$ obtained from fecal culture (($2.600.5{\;}{\pm}{\;}172.4{\;}{\mu\textrm{m}}$) (P<0.05). Although worm fecundity and EPG counts differed among culture methods but worm burdens and course of infection did not. These findings suggest that the methods of cultures have a significant effect on the morphological development of the larvae to the $L_3$ stage, but do not influence the infectivity to rats.