• 치과방사선
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• 제29권1호
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• pp.175-189
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• 1999

The purpose of this study was to established the characteristic radiographic features in salivary gland diseases by means of sialography and scintigraphy. Sialograms and scintigrams with diseases of salivary gland were examined. In this group were 5 salivary stones, 14 sialadenitis, 17 Sjogren's syndromes and 8 benign tumors. The obtained results were as follows; 1. In the configuration of the shape of main duct, those revealed that modified curvilinear and curvilinear types were predominant in Sjogren's syndromes but reverse sigmoid and angular types were in sialolithiasis and sialadenitis combined with sialodochitis. 2. In the configuration of the course of main duct, those revealed that smooth types were predominant in sialadenitis and irregular types were predominant in Sjogren's syndromes and benign tumors and irregular types were seen in all salivary stones and sialadenitis combined with sialodochitis, 3. In the type of intraglandular pattern, those revealed that destructive changes of salivary duct system and parenchyma were severe in sialadenitis and salivary stones and predominantly severe in Sjogren's syndromes. 4. The function of salivary gland was decreased severely in Sjogren's syndrome. and also decrease in salivary stone and sialadenitis. In benign tumor, the uptake of radioisotope was not seen in lesion and the function of salivary gland decreased in its remaining normal parenchyma.

• 대한핵의학회지
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• 제16권1호
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• pp.23-30
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• 1982

Serum thyroxine binding globulin (TBG) was measured with a radioimmunoassay (RIA) kit (GammaDab TBG). The TBG concentration in 23 adult normals was $23.7{\pm}1.9{\mu}g/ml(mean{\pm}SD)$. The serum TBG levels of $21.6{\pm}3.5{\mu}g/ml$) in hyperthyroidism, $24.7{\pm}4.9{\mu}g/ml$ in subacute thyroiditis, $20.7{\pm}7.0{\mu}g/ml$ in liver cirrhosis and $22.6{\pm}3.7{\mu}g/ml$ in sick patient were not significantly different from normals. The levels of $31.8{\pm}5.9{\mu}g/ml$ in hypothyroidism, $36.2{\pm}5.1{\mu}g/ml$ in pregnancy (p<0.01, p<0.001) and $29.3{\pm}6.1{\mu}g/ml$ in molar pregnancy (p<0.01) were significanty higher that in normals. In various cases without thyroid dieases (euthroid group), the TBG concentration correlated with the value for Amerlex $T_3$ (r=0.816) though there was curvilinear relationship. This relationship was altered in hyperthyroidism, subacute thyroiditis and molar pregnancy in which sera were overloaded with thyroxine $(T_4)$ so that concentration of unoccupied binding sites on TBG (free TBG concentration) were more decreased than expected from normal TBG concentrations. Hypothyroidism was also separated from the curvilinear relationship in euthyroid group indicating that free TBG concentrations were more increased relative to slightly increased TBG concentrations. Measurement of the TBG concentration was considered useful in the diagnosis of TBG defiency, in differentiating molar pregnancy from hyperthyroidism and for correct understanding the hormone binding in liver dieases and other nonthyroidal illness.

• 대한조선학회지
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• 제6권1호
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• pp.1-24
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• 1969

Chine형선(型船)의 선체진동(船體振動) 또는 운동(運動)의 해석(解析)에 필요(必要)한 부가질량계산(附加質量計算)에 기여(寄與)할 목적(目的)으로 등각사상법(等角寫像法)의 응용(應用), 즉(卽) 실선(實船)과 유사(類似)한 단면형상(斷面形狀)을 주는 2경수근(徑數群) 사상함수(寫像函數)를 얻어 이를 이용(利用)하여 동단면(同斷面)의 주상체(柱狀體)에 대(對)하여 이상유체(理想流體)의 자유수면(自由水面)에서의 상하(上下) 및 수평진동(水平振動)에 대(對)한 부가질량(附加質量)을 계통적(系統的)으로 계산(計算)했으며, 동계산결과(同計算結果)를 상하진동(上下振動)에 대(對)하여서는 Lewis form 주상체(柱狀體) 및 직선요소단면주상체(直線要素斷面柱狀體)에 대(對)한 이론적(理論的) 계산결과(計算結果)와 그리고 수평진동(水平振動)에 대(對)해서는 Lewis form 주상체(柱狀體)에 대(對)한 것과 비교고찰(比較考察)하였다.

• 한국동물생명공학회지
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• 제37권2호
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• pp.113-120
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• 2022

Sperm cryopreservation is a fundamental process for the long-term conservation of livestock genetic resources. Yet, the packaging method has been shown, among other factors, to affect the frozen-thawed (FT) sperm quality. This study aimed to develop a new mini-straw for sperm cryopreservation. In addition, the kinematic patterns, viability, acrosome integrity, and mitochondrial membrane potential (MMP) of boar spermatozoa frozen in the developed 0.25 mL straw, 0.25 mL (minitube, Germany), or 0.5 mL (IMV technologies, France) straws were assessed. Post-thaw kinematic parameters were not different (experiment 1: total motility (33.89%, 32.42%), progressive motility (19.13%, 19.09%), curvilinear velocity (42.32, 42.86), and average path velocity (33.40, 33.62) for minitube and the developed straws, respectively. Further, the viability (38.56%, 34.03%), acrosome integrity (53.38%, 48.88%), MMP (42.32%, 36.71%) of spermatozoa frozen using both straw were not differ statistically (p > 0.05). In experiment two, the quality parameters for semen frozen in the developed straw were compared with the 0.5 mL IMV straw. The total motility (41.26%, 39.1%), progressive motility (24.62%, 23.25%), curvilinear velocity (46.44, 48.25), and average path velocity (37.98, 39.12), respectively, for IMV and the developed straw, did not differ statistically. Additionally, there was no significant difference in the viability (39.60%, 33.17%), acrosome integrity (46.23%, 43.23%), and MMP (39.66, 32.51) for IMV and the developed straw, respectively. These results validate the safety and efficiency of the developed straw and highlight its great potential for clinical application. Moreover, both 0.25 mL and 0.5 mL straws fit the present protocol for cryopreservation of boar spermatozoa.

• Journal of Korea Trade
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• 제24권8호
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• pp.121-132
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• 2020

Purpose - The principle aim of this study is to further investigate the relationship between market diversity and export performance. We examine the benefits and costs of geographic market diversity regarding the number of countries exported to by firms on their export performance. Based on the financial risk reduction model and the entry costs model, we propose a way to incorporate the costs and benefits aspects of market diversity. Design/methodology - To empirically investigate our research question, the curvilinear relationship between market diversity and export performance, we built a secondary panel data set between 2015 and 2019, containing 17,863 observations of Korean exporting companies. A generalized least squares panel estimator with fixed effects was employed to test the hypothesis, and the statistical package, Stata 14, was used. Findings - Our main findings are as follows: As market diversity increases, export performance increases because exporters can diversify and reduce financial risks in export markets. However, the relationship between the two does not grow. As it peaks, the entry costs increase due to the high market diversity, thereby outweighing the benefits, leading, eventually to decrease in the export performance. Consequently, there is an inverted U-shaped relationship between market diversity and export performance. Originality/value - In the export and trade literature, the impact of market diversity on export performance has not been addressed yet, despite the importance of this subject. Many scholars have assumed a positive linear relationship between the two, considering only the decrease in market risks as the number of overseas markets increases, without examining the increase in the entry and management costs. Therefore, our study contributes by providing a new perspective for analyzing the characteristics and outcomes of market diversity.

• International Journal of Control, Automation, and Systems
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• 제3권2호
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• pp.173-182
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• 2005

In this paper, a target tracking algorithm for tracking maneuvering vehicles is presented. The overall algorithm belongs to the category of an interacting multiple-model (IMM) algorithm used to detect multiple targets using fused information from multiple sensors. First, two kinematic models are derived: a constant velocity model for linear motions, and a constant-speed turn model for curvilinear motions. Fpr the constant-speed turn model, a nonlinear information filter is used in place of the extended Kalman filter. Being equivalent to the Kalman filter (KF) algebraically, the information filter is extended to N-sensor distributed dynamic systems. The model-matched filter used in multi-sensor environments takes the form of a federated nonlinear information filter. In multi-sensor environments, the information-based filter is easier to decentralize, initialize, and fuse than a KF-based filter. In this paper, the structural features and information sharing principle of the federated information filter are discussed. The performance of the suggested algorithm using a Monte Carlo simulation under the two patterns is evaluated.

• 한국기계연구소 소보
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• 통권17호
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• pp.93-97
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• 1987

This paper is concerned on kinematic analysis and simulation of an automatic feeding mechanism and a curved inverse earn. The main objective is the development 0 fan algorithm of the earn-feeding mechanism and a CAD program. The computer program CACAFS (Computer-Aided Cam and Automatic Feeding System) is developed by using the state-of-the-art for CAD. Thus, the program CACAFS is independent of computer hardwares and also interactive. As the second part of paper, this paper introduces the technique for the mechanism simulation and graphics-oriented CAD programming. The first part of r paper presents the algorithm to analyze the motion of the inverse earn and the automatic feeding mechanism.

• 한국기계연구소 소보
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• 통권17호
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• pp.83-91
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• 1987

This paper is concerned on kinematic Analysis and Simulation of an automatic feeding mechanism and a curved inverse cam. The main objective is the development of an algorithm of the cam-feeding mechanism and a CAD program. The computer program CACAFS (Computer-Aided Cam and Automatic Feeding System is developed by using the state-of-the-art for CAD. Thus, the program CACAFS is independent of computer hardwares and also interactive. As the first part of paper, this paper introduces the algorithm to analyze the motion of the inverse cam and the automatic feeding mechanism. The second part of paper presents the technique for the mechanism simulation and graphics-oriented CAD programming.

• 한국전산유체공학회지
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• 제15권2호
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• pp.55-61
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• 2010

A dependence of weighting parameter in preconditioning method for solving low Mach number flow with incompressible flow nature is investigated. The present preconditioning method employs a finite-difference method applied Roe‘s flux difference splitting approximation with the MUSCL-TVD scheme and 4th-order Runge-Kutta method in curvilinear coordinates. From the computational results of benchmark flows through a 2-D backward-facing step duct it is confirmed that there exists a suitable value of the weighting parameter for accurate and stable computation. A useful method to determine the weighting parameter is introduced. With this method, high accuracy and stable computational results were obtained for the flow with low Mach number in the range of Mach number less than 0.3.

• 대한화학회지
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• 제38권11호
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• pp.800-807
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• 1994

직독식 원자방출분광기로 철강 재료중의 구성원소를 매트릭스 보정법으로 신속히 분석하는 방법에 대하여 연구하였다. 선형과 비선형법으로 매트릭스 보정계수를 구하였으며 이때 구한 매트릭스 계수는 서로 차이가 있지만 이들의 계수를 이용하여 구한 분석결과는 비교적 잘 일치하였다.