• Parasites, Hosts and Diseases
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• 제59권5호
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• pp.519-522
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• 2021

The Chinese edible frogs, Hoplobatrachus rugulosus (n=20), and the striped snakehead fish, Channa striata (n=34), were purchased from local markets in 3 administrative regions of Cambodia (Phnom Penh, Pursat, and Takeo Provinces) from May 2017 to April 2019, and their infection status with Gnathostoma sp. larvae was investigated. The frogs and fish were transported to the laboratory with ice and examined using the artificial digestion method. Advanced 3rd-stage larvae (AdL₃) of Gnathostoma spinigerum, 24 in total number (1-6 larvae/frog), were detected from 6 (60.0%) out of 10 frogs purchased from Phnom Penh. No gnathostome larvae were detected in 10 frogs purchased from Takeo Province and 34 snakeheads from Phnom Penh, Pursat, and Takeo Provinces. AdL₃ isolated from the frogs were 2.55-3.90 mm long and 0.31-0.36 mm wide. They had a characteristic head bulb (0.081×0.191 mm in average size) with 4 rows of hooklets, a muscular long esophagus (0.950-1.230 mm long), and 2 pairs of cervical sacs (0.530-0.890 mm long). The average number of hooklets in the 1st, 2nd, 3rd, and 4th rows was 41, 45, 48, and 51, respectively. These features were consistent with G. spinigerum AdL₃. By the present study, it has been first confirmed that the Chinese edible frog, H. rugulosus, from Phnom Penh serves as a second intermediate host for G. spinigerum, although their intensity of infection was not so high compared to other previously reported localities.

• 한국산학기술학회논문지
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• 제17권6호
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• pp.700-707
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• 2016

최근 군에서 사격 훈련 중 1990년에 제조된 40mm 저속유탄(K200)은 탄착불발에 의한 탄약 악작용이 발생하였다. 악작용 내용은 총 72발의 사격 중 11발의 불발탄이 발생되어 불발율은 15% 정도였다. 탄약은 장기 저장 후 사용하는 품질특성을 가지고 있으므로 장기 저장시에도 성능 및 안전성 등의 확보가 필수적이다. 따라서 본 연구에서는 40mm 저속유탄용 신관의 품질개선을 통해 불발율을 최소화하고자 하였다. 첫 번째로 기폭관 성능시험, 발사시험 등을 수행한 결과 불발의 원인을 신관 화공품인 기폭관의 경시변화에 의한 성능저하로 판단하였다. 두 번째로 불발율을 최소화하기 위해 기폭관의 화약량을 증가시키고 화약량 증가에 따른 부품의 치수를 변경하는 등 40mm 저속유탄 신관의 품질개선을 추진하였다. 마지막으로 품질 개선 전 후 기존품과 개선품의 가속노화시험을 통해 저장수명을 예측해 본 결과 기존품은 6.5년, 개선품은 45.5년으로 개선되어 신관의 수명이 약 7배 향상된 결과를 도출하였다. 이에 품질 개선된 40mm 저속유탄 신관은 장기 저장시 불발율이 감소되어 40mm 저속유탄의 안전성, 신뢰성, 성능 향상에 기여할 것으로 판단된다.

• The Journal of Advanced Prosthodontics
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• 제13권3호
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• pp.172-179
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• 2021

Purpose. This intra-patient retrospective study of up to 10 years evaluated the clinical success and risk factors of 6- and 8-mm long implants and their respective prostheses. Materials and Methods. The sample consisted of patients treated at a Military Polyclinic dental service, who received both 6- and 8-mm long tissue level implants in the posterior region of the same arch. Data were collected from the dental charts, clinical and radiographic exams, self-report of sleep bruxism, measurement of maximum occlusal force, and clinical crown-to-implant (C/I) ratio. Data were analyzed by descriptive and inferential statistics with univariate and hierarchical multivariate models, at the 0.05 significance level. Results. The 30 patients (27 women) had 85 implants and 83 prostheses. Two implants were lost before prosthesis installation (implant survival: 97.6%). Ten events of prosthetic complication (screw tightening loss) occurred in five patients (success rate: 87.9%) in a single moment. Only the variable C/I ratio had a significant effect for repairable prosthesis complication (P<.05). Conclusion. The results suggest that 6- and 8-mm long implants have similar long-term clinical success for implants and prostheses.

• Tuberculosis and Respiratory Diseases
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• 제46권4호
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• pp.542-547
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• 1999

연구배경: 전산화 단층 촬영(CT)에 의한 폐암의 종격동 림프절전이 판정은 폐암의 치료계획과 예후 결정에 중요하다. 일반적으로 종격동 림프절의 장경이 15mm 이상이면 폐암 전이로 인정하는 방법이 정확도가 양호하다고 한다. 림프절의 크기가 증가하기 이전의 미소전이 시에는 CT로서의 전이가 인정되지 못한다. 특히 폐암의 조직병리학적 구분에 의한 폐 선암은 다른 폐암보다 미소전이와 원격전이가 잘 되므로, 비선암에 비해 종격동 림프절 전이가 있더라도 CT상에 림프절 크기의 증가가 뚜렷하지 않으리라 생각된다. 이에 저자들은 폐암의 종격동 림프절 전이의 판정 기준으로 CT상의 일정 크기 이상의 기준을 일률적으로 적용하는 것보다는 미소전이가 잘 되는 선암은 비선암보다 림프절 크기의 증가 기준이 낮아야 한다는 생각아래 그 실태를 파악하였다. 방 법: 대상은 원광대학병원에서 원발성 비소세포 폐암으로 진단받고, 근치적 폐암 절제술을 실시받는 60례이다. 남녀비는 남자 46명, 여자 14명이었고, 중간 연령은 61.5세였다. 조직병리학적 구분은 편평상피암이 41례, 대세포암 2례, 선암 17례이다. TNM 병기상 I기가 23례 II기가 24례 IIIA기가 13례였다(Table 1). 수술전 CT상의 림프절 크기와 수술 후 병리학적으로 전이가 확인된 림프절의 크기를 상호 비교하여 비선암 및 선암의 경우에 있어서 각각의 전이 림프절 크기의 차이를 확인한다. 그리고 각 폐암별로 림프절 장경 기준 15mm, 10mm를 각각 폐암 전이기준으로 하였을 때의 예민도, 특이도, 정확도를 계산하여 서로 비교하였다. 결 과: CT상 림프절 장경 10mm 이상인 림프절군에서 수술후 조직병리학상 폐암의 전이가 인정된 림프절의 평균 장경은 비선암군이 16.0($\pm8.0$)mm, 선암군이 12.0($\pm3.2$)mm로서 통계화적으로 유의하게 선암군의 림프절 장경이 비선암군의 림프절 장경보다 작았다(p<0.05). 종격동 림프절의 장경 15mm이상을 폐암 전이로 인정할 경우에 예민도, 특이도, 양성예측율, 음성예측율, 정확도가 비선암군이 54%, 100%, 100%, 83%, 86%였으며 선암군은 43%, 90%, 75%, 69%, 71%였다(Table 2). 종격동 림프절의 장경 10mm 이상을 폐암 전이로 인정할 경우에 예민도, 특이도, 양성예측율, 음성예측율 정확도가 비산암군이 65%, 77%, 61%, 92%, 79%였으며 선암군은 100%, 80%, 78%, 100%, 88%였다(Table 3). 결 론: 선암군에 있어서 종격동 림프절 장경 10mm를 기준으로 하였을때의 폐암 전이 인정의 정확도가 88%로서, 15mm를 기준으로 하였을때의 79%보다 양호함을 확인할 수 있었다.

• 대한치과보철학회지
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• 제39권5호
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• pp.463-476
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• 2001

Since the treatment of edentulous patients with osseointegrated implant was first introduced more than 30 years ago, implant therapy has become one of the most important dental treatment modalities today. Based on the previous experience and knowledge, $Br{\aa}nemark\;Novum^{(R)}$ protocol was introduced with the concept of simplifying surgical and prosthetic technique and reducing healing time recently. This protocol recommends the installation of three 5mm wide diameter futures in anterior mandible and the prefabricated titanium bars for superstructure fabrication. This study was designed to analyze the stress distribution at fixture and superstructure area according to changes of fixture number, diameter and superstructure materials. Four 3-dimensional finite element models were fabricated. Model 1 - 5 standard fixtures (13mm long and 3.75mm in diameter) & superstructure consisted of type IV gold alloy and resin Model 2- 3 wide diameter fixtures (13mm long and 5.0mm in diameter) & superstructure consisted of type IV gold alloy and resin Model 3-3 wide diameter fixtures (13mm long and 5.0mm in diameter) & superstructure consisted of titanium and resin Model 4-3 wide diameter fixtures (13mm long and 5.0mm in diameter) & superstructure consisted of titanium and porcelain A 150N occlusal force was applied on the 1st molar of each model in 3 directions - vertical($90^{\circ}$), horizontal($0^{\circ}$) and oblique($120^{\circ}$). After analyzing the stresses and displacements, following results were obtained. 1. There were no significant difference in stress distribution among experimental models. 2. Model 2, 3, 4 showed less amount of compressive stress than that of model 1. However, tensile stress was similar. 3. Veneer material with a high modulus of elasticity demonstrated less stress accumulation in the superstructure. Within the limites of this study, $Br{\aa}nemark\;Novum^{(R)}$ protocol demonstrated comparable biomechanical properties to conventional protocol.

• 한국임상수의학회지
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• 제17권1호
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• pp.187-193
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• 2000

Fifteen adult Korea Jin-do dogs were studied by echocardiography to obtain the basic data of the imaging planes and normal references ranges to the aorta and pulmonary artery internal dimension. Measurements of aortic root internal dimension(AOID) and right pulmonary artery internal dimension (RPAID) were made at modified pulmonary arteries level short-axis view and left ventricular outflow tract long-axis view. The aortic root internal dimension and right pulmonary artery internal dimension at modified pulmonary arteries level short-axis view were 18.7$\pm$1.3mm (mean$\pm$SD) and 10.1$\pm$0.8mm, respectively. And RPAID/AOID was 0.5$\pm$0.1mm. The aortic root internal dimension and right pulmonary artery internal dimension at left ventricular outflow tract long-axis view were 19.3$\pm$1.6 mm and 10.7$\pm$1.3mm, respectively. And RPAID/AOID was 0.5$\pm$0.1mm. These results indicate that modified pulmonary arteries level short-axis view is useful planes to examine the aortic root and pulmonary arteries, and aortic root internal dimension is significantly higher(40~50%)than the right pulmonary artery internal dimension. Therefore measurements of aortic root internal and right pulmonary artery internal dimension can be used for monitoring dilation of pulmonary artery.

• 한국작물학회지
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• 제45권4호
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• pp.251-256
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• 2000

Astragalus membranaceus has flowers that are similar to that of the legume family, but shows poor bearing when self-pollination is induced. Thus, this study was carried out observing the ripening procedure of pistils and stamens and development stages of pollen in the context of the birth and growth of the flower. As to the bearing of the flower of A. membranaceus, few pod setting and 13% pod setting were observed when self-pollination is induced by paper-bag covering or artificial pollination treated respectively. The result indicates that A. membranaceus is a cross-pollination plant. A pistil grew faster than a stamen until just before blooming. The flower size was about 17.0mm$\times$4.0mm. Pistils and stamens had the same length after flowering. Pollen mother cells passed through meiosis and mitosis when its length reached around 3.5mm, thus creating the tetrade when 4 mm long. Pollen attained full growth when the bud was about 10mm long. An anther was found to tend to dehisce when the length of a bud reached around 12.0mm. As to the shape of pollen, about 70 % were normal. 1% and 30 % were small or empty pollen respectively. The result indicates that pollen of A. membranaceus attains full growth just before anther dehiscence which occurs before blooming while pistils grow faster than stamens until before flowering.

• 대한화학회지
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• 제39권11호
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• pp.863-868
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• 1995

내벽이 유리로 코팅된 스테인레스 스틸 관, 실리카로 코팅된 스테인레스 스틸관 및 보통 스테인레스 스틸관 등 여러 재질의 관에 C18 (5.mu.) 고정상을 충전시켜 길이 30cm, 내경 1mm 및 0.5mm인 마이크로컬럼들을 제작하고 그 성능을 비교 조사하였다.p-Nitroaniline과 N, N-dimethyl-o-nitro-p-toluidine 및 ethyl-benzene 등을 시험 용질로 사용하였다. 유리 또는 실리카로 코팅된 컬럼이 보통 스테인레스 스틸 컬럼보다 효율이 우수하며 컬럼내면이 거울같이 고와야 정지상 충전이 잘되는 것을 확인하였다. 유리코팅된 경우 내경 0.5mm, 길이 30cm 인 컬럼에 대해서도 이론단수가 10,000을 상회하는 결과를 얻을 수 있었다.

• 한국지반신소재학회논문집
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• 제16권2호
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• pp.89-96
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• 2017

본 연구에서는 국내에서 30m 이상인 대심도에서 강성이 큰 CS-H벽체를 만들기 위하여 지반신소재를 이용하였으며 지반신소재의 혼입율과 슬럼프(슬럼프 플로우) 값에 변화를 주어 현장여건에 맞는 배합을 실시하였으며 목표 슬럼프 180mm 및 슬럼프 플로우 500mm에서는 초기 휨강도, 장기 거동특성 및 탄성계수의 역학적 특성과 동시에 경제성을 모두 만족할 수 있는 배합을 확인하였으나 슬럼프 플로우 600mm에서는 역학적 특성 및 초기, 장기 거동특성에서 취약한 결과를 보였다.

• 대한치과보철학회지
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• 제35권4호
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• pp.627-646
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• 1997

In order to find the degree of osseointegration at bone-implant interface of clinically successful implants, models including the 3.75mm wide, 10mm long screw type $Br{\aa}nemark$ implant as a standard and cylinder, 15mm long, 5.0mm wide, two splinted implants, and implants installed in various cancellous bone density were designed. Also, the amount of load and material of prostheses were changed. The stress and minimum contact fraction were analyzed on each model using three-dimensional finite element method(I-DEAS and ABAQUS version 5.5). The results of this study were as follows. 1. 10mm long, 3.75mm diameter-screw type implant had $36.5{\sim}43.7%$ of minimum contact fraction. 2. Cylinder type implant showed inferior stress distribution and higher minimum contact fraction than screw type. 3. As implant length was increased, minimum contact fraction was increased a little, however, maximum principal stress was decreased. 4. Implants with a large diameter had lower stress value with slightly higher minimum contact fraction than standard screw type. 5. Two splinted implants showed no change of minimum contact fraction. 6. The higher bone density, the lower stress value. 7. The material of occlusal surface had no effect on the stress of the bone-implant interface.