• Information and Communications Magazine
• /
• v.33 no.5
• /
• pp.48-54
• /
• 2016

우리는 물리적인 현실 세계와 디지털의 가상 세계에서 매일 끊임없이 데이터를 양산해내고 있다. 구글, 아마존, MS, IBM 등의 유수 기업들은 이미 데이터를 수집하고 분석하여 특정 사용자나 불특정 다수에게 다양한 서비스를 제공하면서 새로운 형태의 이윤을 창출하고 있다. 가까운 미래에 사물인터넷(Internet of Things)이 본격적으로 활성화된다면 사람뿐만 아니라 모든 사물들이 인터넷을 통해 데이터를 양산하고 서로 교환하는 그야말로 데이터 빅뱅의 시대가 도래할 것으로 예상된다. 이러한 변혁의 시대에 우리는 사물인터넷을 통해 수집되는 수많은 데이터를 어떻게 활용할 것인지에 대해 진지하게 고민하고 연구할 필요가 있다. 본고에서는 사물인터넷을 통해 수집된 데이터를 효과적으로 활용하기 위해 필요한 핵심기술 중 하나인 기계학습(Machine Learning)에 대해 기본 개념, 종류, 평가방법 등을 설명하고 기계학습 알고리즘 중 딥 러닝(Deep Learning)에 대한 기술 동향을 살펴본 후, 사물인터넷에서 기계학습 프레임워크에 대해 간략히 소개한다.

• Proceedings of the KWS Conference
• /
• 2006.10a
• /
• pp.23-25
• /
• 2006

The purpose of this study is to optimize the plate thickness of the main frame of a construction equipment. For this, the load history at the joints of the main frame was evaluated using mechanism and finite element analysis. With the load data, the stress and the stiffness at the main frame was evaluated and the fatigue life at each weld joint of the main frame was assessed with the change of the plate thickness. Based on the results of this study, the proper plate thicknesses of the frame of the construction equipment were proposed.

• Journal of Yeungnam Medical Science
• /
• v.21 no.2
• /
• pp.251-255
• /
• 2004

Spontaneous uterine rupture of the unscarred uterus during the second trimester of pregnancy is rare, but it is a surgical emergency. Because it results in rapid deterioration of patient and high mortality despite of prompt operation and massive transfusion, early diagnosis and proper management are critical for optimizing patient care. We present a case of spontaneous uterine rupture with fetal death in 14 weeks gestation with a brief review of literatures.

• Journal of Yeungnam Medical Science
• /
• v.16 no.2
• /
• pp.141-154
• /
• 1999

Premature birth is the single largest cause of perinatal mortality and morbidity nonanomalous infants in developing countries. Advances in neonatal care have lead to increase survival and reduced short and long term morbidity for preterm infants, but the rate of preter birth has actually increased. This review provides recent multifactorial approaches to treatme and prevention of preterm birth.

• Journal of Yeungnam Medical Science
• /
• v.25 no.2
• /
• pp.124-127
• /
• 2008

Leiomyomas are common in the myometrial layer of the uterus, though they are rarely found in other reproductive organs. Leiomyomas are benign, hormone-sensitive smooth muscle tumors. They develop during the reproductive years and regress after menopause. Preoperative diagnosis is difficult to make. We present a case of a 54-year-old woman with a vaginal wall tumor. The management in this case included surgical excision. Histologic examination definitively confirmed the diagnosis of a vaginal leiomyoma. We report the details of this case along with a brief review of the literature.

• Journal of the Korean Society for Precision Engineering
• /
• v.16 no.5 s.98
• /
• pp.83-90
• /
• 1999

The prevalence of microprocessor-based controllers in automotive system has greatly increased the need for tools which can be used to validate and test control system over their full range of operation. The objective of this paper is to develop a real time simulator of an anti-lock braking system and traction control system by the methodology of using hardware-in-the-loop simulation based on a personal computer. By use of this simulator, the analyses of commercial electronic control units and components for ABS/TCS were performed successfully. The simulator of this research can be applied to development of more advanced control system(such as vehicle dynamic control system) and other automotive system.

• Proceedings of the KWS Conference
• /
• 2005.11a
• /
• pp.91-93
• /
• 2005

The purpose of this study is to evaluate effects of stiffener configuration welded to the plate on the fatigue strength. Nominal stress and hot spot stress for the stiffened plate under pure bending condition were evaluated using FEA and experiment and fatigue test for each specimen was performed. For S and SD type, the fatigue strength increase with a decrease in the nominal stress and hot spot stress. D type with doubler plate was found to have the lowest value of nominal and hot spot stress for a given condition. However its fatigue strength was smaller than the others.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.9 no.2
• /
• pp.152-167
• /
• 2001

Recently safety systems for the commercial vehicle have been rapidly developed. However, we still have many problems in the vehicle stability and the braking performance. Especially, a commercial vehicle may meet a dangerous braking condition when the vehicle is lightly loaded or empty and when the road is wet or slippery. Under these conditions, the truck can spin out or the tractor can jackknife or the trailer can swing out. To design the air brake system for the commercial vehicle, since the air brake system has many design variables, there must have been intensive researches on a method how to prevent dynamic instability and how to maximize the vehicle deceleration. In this study, mathematical models about the tractor-semitrailer and the air brake system including an ABS controller have been constructed for computer simulation. Also, simple examples are applied to show the usefulness of the program. Designers can use this simulation program for understanding the braking characteristics such as trajectory, braking distance, longitudinal deceleration, lateral deceleration, and yaw rate on various road conditions.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.7 no.5
• /
• pp.194-205
• /
• 1999

The prevalence of microprocessor-based controllers in automotive systems has greatly increased the need for tools which can be used to validate and test control systems over their full range of operation. The objective of this paper is to develop a real time simulator of traction control system by the methodology of using hardware-in-loop simulation based on a personal computer. By use of this simulator, the analysis of commercial electronic control units and components for TCS were performed successfully. The simulator of this research can be applied to development of more advanced control systems(suck as vehicle dynamics control system) and other automotive system.

• Proceedings of the KWS Conference
• /
• 2005.06a
• /
• pp.60-62
• /
• 2005

The purpose of this study is to evaluate the effect of spot heating on the fatigue strength at the weldment. To do this, the transitional behavior of residual stress at the weld toe induced by spot heating was identified using FEA and experiment. The amount and distribution of residual stress at the weld toe strongly depends on the locations of spot heating. Based on the results, the proper spot heating condition was established. The fatigue strength of the spot-heated specimen increases compared with as-welded specimen.