• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제11권sup2호
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• pp.35-43
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• 2008

Jaundice is common in breast-fed infants. Any infant noted to be jaundiced at 2 weeks of age need to be evaluated for cholestasis with measurement of total and direct serum bilirubin. The most common causes of cholestatic jaundice in infants are biliary atresia and neonatal hepatitis. Genetic causes of the neonatal hepatitis syndrome are increasingly recognized and idiopathic neonatal hepatitis is decreasing. Cholestasis should be investigated using a structured protocol. Early detection and timely, accurate diagnosis is important for successful treatment and a favorable prognosis. In particular, a Kasai portoenterostomy for biliary atresia has the best outcome if performed before the infant is 8 weeks of age. The management of cholestasis is mainly supportive, including nutritional support and alleviation of symptoms to improve the quality of life. Specific treatments are available for some causes of neonatal hepatitis syndrome and should be started as soon as possible. For decompensated liver disease, liver transplantation yields a better outcome.

• Tribology and Lubricants
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• 제26권4호
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• pp.219-223
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• 2010

Despite the increasing need of nanometer-scale accuracy in abrasive machining using ultrasmall particles such as abrasive jet and chemical mechanical polishing(CMP), the process mechanism is still unknown. Based on the background, research on the effects of various process parameters on the machined surface at abrasive machining was motivated and performed by using finite element analysis where the effect of slurry fluid flow involved. The effect of particle shape on the machined surface during particle-surface collision was discussed in this paper. The results from FEA simulation revealed that any damage or defect generation on machined surface by the impact may occur only if the particle has enough impact energy. Therefore, it could be concluded that generation of the defects and damage on the wafer surface after CMP process was mainly due to direct contact of the 3 bodies, i.e., pad-particle-wafer.

• Journal of Chest Surgery
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• 제19권2호
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• pp.273-279
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• 1986

Total anomalous pulmonary venous return is a cardiac malformation in which there is no direct connection between any pulmonary vein and the left atrium but, rather all the pulmonary veins connect to the right atrium or one of its tributaries. TAPVC is a relatively uncommon anomaly, accounting for only about 1.5-3% of cases of congenital heart disease. Recently improvement in intraoperative techniques did eventually bring substantial improvements in the results in infants. 4 cases of TAPVC was successfully treated with one-stage operation, in the Dept. of Thoracic and Cardiovascular Surgery, National Medical Center in which 2 cases are supracardiac types and the other 2 cases are cardiac types. Sex ratio was 1:1, and the range of age was 2 years-18 years. The common pulmonary venous sinus was connected to the left vertical vein and innominate vein: in 2 supracardiac types and coronary sinus in 2 cardiac types. All cases are operated with standard cardiopulmonary bypass, and the hospital mortality was 0%.

• 제어로봇시스템학회논문지
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• 제6권8호
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• pp.703-709
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• 2000

This paper proposes a compliance control strategy for the robot manipulators accidentally interact-ing with an unknown environment. In this proposed method each in the diagonal stiffness matrix corre-sponding to the task coordinate in a Cartesian space is adaptively adjusted during contact along the corresponding axis based on the contact force with its environment. This method can be used for both unconstrained and constrained motions without any switching mechanism which often causes undesirable instability and/or vibrational motion of the end-effector. The experimental results show the effectiveness of the proposed method by employing a two link direct drive manipulator interacting with an unknown environment.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1991년도 하계학술대회 논문집
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• pp.247-250
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• 1991

In this paper, we have investigated the poling conditons depending upon the electric field and temperature for PZT ceramics with various stoichiometry prepared by wet direct method, and $MnO_2$ dopant. The electric field required for saturation polarization was plotted against temperature $(1,000/T^{\circ}K)$ so that the required field could be estimated at any given temperature by measuring the charge displaced during poling. From this curve it should be possible to predict the field required to produce maximum domain switching at temperature below the Curie temperature, when $MnO_2$ dopant was added to the PZT ceramics, the electric field required for saturation polarization was lowered than that of undoped PZT samples.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.397-400
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• 2004

The direct extrusion with porthole die can produce condenser tube which has the competitive power in costs and qualities compared with the existing conform extrusion. In general, porthole die extrusion has a great advantage in the forming that produces the hollow sections difficult to produce by conventional extrusion with a mandrel on the stem. Especially, condenser tube manufactured by porthole die belongs to sophisticated part and demands tighter dimension tolerance and higher surface finish than any other part. In order to confirm the general of porthole die extrusion, we perform the 3D FE analysis of hot porthole extrusion in non-steady state by using DEFORM 3D and investigate a pattern of elastic deformation for porthole die through the stress analysis using ANSYS 5.5 during extrusion process.

• 한국산업안전학회:학술대회논문집
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• 한국안전학회 1998년도 춘계 학술논문발표회 논문집
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• pp.265-270
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• 1998

As the goal of enterprises is to pursuit benefits, the goal of safety management is not only preventing accidents but also promoting benefits and productivity. However, enterprises have failed to realize the necessity of safety management, partly because they didn't grasp any appropriate evidences advocating effectiveness of safety management. This study aimed to survey construction-site engineers' consciousness on safety management contributing to cost reduction, construction period and quality enhancement. The result of this study showed that constriction-site engineers recognized the ratio of direct cost to Indirect cost as 1:2. The proportion of repliers who thought that safety management is contributable to cost reduction was 35％, to construction period was 20％, and to quality enhancement was 48％. The construction sites with excellent safety accomplisments also had good work and selling amounts.

• 한국통신학회논문지
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• 제34권7C호
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• pp.635-639
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• 2009

본 논문에서는 행벡터의 집합이 이진 벡터합 연산에 관해 닫혀있는 모든 하다마드 (Hadmard) 행렬들은 서로 동치(equivalent) 임융 증명한다. 이를 이용하면, 최대길이 수열로부터 생성된 순회 (cyclic) 하다마드 행렬과 크로네커 (Kronecker) 곱에 의해 생성된 월쉬-하다마드 (Walsh-Hadamard) 행렬이 동치임을 간단히 보일 수 있다.

• 한국정보기술응용학회:학술대회논문집
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• 한국정보기술응용학회 2005년도 6th 2005 International Conference on Computers, Communications and System
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• pp.187-190
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• 2005

Ultra wideband (UWB) technologies have been developed to exploit a new spectrum resource in substances and to realize ultra-high-speed communication, high precision geolocation, and other applications. The energy of UWB signal is extremely spread from near DC to a few GHz. This means that the interference between conventional narrowband systems and UWB systems is inevitable. However, the interference effects had not previously been studied from UWB wireless systems to conventional mobile wireless systems sharing the frequency bands such as WCDMA system. This paper experimentally evaluates the interference from two kinds of UWB sources, namely a direct-sequence spread-spectrum UWB source and an impulse radio UWB source, to a WCDMA digital transmission system. The average frame error rate degradations are presented. From these experimental results, we show that in all practical cases UWB system can coexist with WCDMA terminal without causing any dangerous interference.

• Journal of Electrical Engineering and Technology
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• 제12권6호
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• pp.2307-2316
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• 2017

The aim of this paper is to provide an optimal design of in-wheel motor for an electric scooter (E-scooter) considering economical production. The preliminary development in-wheel motor, which has a direct-driven outer rotor type attached to the E-scooter's rear wheel without any gear, is introduced first. The objective of the optimal design of this in-wheel motor is to improve the output characteristics of the motor and to have a stator form to facilitate automatic winding. Response surface methodology was used for the optimal design and 2-dimensional finite element method was used for electro-magnetic field analysis. Experimental results showed that the designed and fabricated in-wheel motor could satisfy the required specifications in terms of speed, power, efficiency, and cogging torque.