• 한국정밀공학회지
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• 제19권12호
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• pp.179-184
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• 2002

In this study, we developed a portable device which can monitor and analyze vibration signals from machines. This system consists a PDA loading the program for vibration analysis and A/D board for vibration acquisition. A PDA is smaller than the palm of the hand, but it has a powerful computing ability as much as an IBM compatible PC with a Pentium 100MHz CPU. The A/D board developed in this study supports LAN interface using TCP/IP communication protocol. The application program for vibration analysis includes signal processing module, fault diagnosis module, data store module, and plot display module. MS visual embedded C＋＋ 3.0 was used to developed the program.

• 대한수의학회지
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• 제60권2호
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• pp.89-92
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• 2020

A 5-year-old dog was evaluated for a lethargy and respiratory distress. Radiograph revealed cardiomegaly with pleural effusion, and the dog died during a thoracocentesis. At necropsy, the descending aorta and pulmonary trunk were dilated and in close contact, but there was no external evidence of a patent ductus arteriosus (PDA). When the descending aorta was opened however, an ostium opening into the pulmonary trunk was evident. Histopathological investigation revealed that the intramural PDA resembled vascular tissue with a structure and architecture. The diagnosis was an intramural PDA, an extremely rarely reported type of PDA in the dog.

• 대한수의학회지
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• 제50권1호
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• pp.49-53
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• 2010

A 5-year-old female Cocker spaniel dog (body weight 7.0 kg) was presented with primary complaints of exercise intolerance and loud precordial thrill which was noticed since she was a puppy. Physical examination revealed a grade V/VI continuous murmur over the maximal point of the left basal area, bounding femoral pulse, but no differential cyanosis. Tall R waves were detected in electrocardiogram, suggesting left ventricular enlargement. Diagnostic imaging studies showed enlarged left ventricle, bulged descending aorta (dAo), markedly dilated right pulmonary artery, and continuous shunt flow between the dAo and main pulmonary artery. Based on these findings, the dog was diagnosed as left to right shunted patent ductus arteriosus (PDA). The patent ductus arteriosus was treated by lodging a PDA duct occluder via the transvenous approach. Clinical signs were markedly improved after the ductal occlusion, the shunt flow was mildly persistent. The case presented is the first case of PDA occluded by the PDA duct occluder via the transvenous approach in a small breed of dog. Although the residual shunt flow was mildly persisted, the dog was clinically normal without detectable murmurs.

• 한국환경보건학회지
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• 제47권6호
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• pp.540-547
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• 2021

Background: Indoor air pollutants are caused by a number of factors, such as coming in from the outside or being generated by internal activities. Typical indoor air pollutants include nitrogen dioxide and carbon monoxide from household items such as heating appliances and volatile organic compounds from building materials. In addition there is carbon dioxide from human breathing and bacteria from speaking, coughing, and sneezing. Objectives: According to recent research results, most indoor air pollution is known to be greatly affected by internal factors such as burning (biomass for cooking) and various pollutants. These pollutants can have a fatal effect on the human body due to a lack of ventilation facilities. Methods: We fabricated a polydopamine (PDA) layer with Ti substrates as a coating on supported glass fiber fabric to enhance its photo-activity. The PDA layer with TiO₂ was covalently attached to glass fiber fabric using the drop-casting method. The roughness and functional groups of the surface of the Ti substrate/PDA coated glass fiber fabric were verified through infrared imaging microscopy and field emission scanning electron microscopy (FE-SEM). The obtained hybrid Ti substrate/PDA coated glass fiber fabric was investigated for photocatalytic activity by the removal of ammonia and an epidermal Staphylococcus aureus reduction test with lamp (250 nm, 405 nm wavelength) at 24℃. Results: Antibacterial properties were found to reduce epidermal staphylococcus aureus in the Ti substrate/PDA coated glass fiber fabric under 405 nm after three hours. In addition, the Ti substrate/PDA coated glass fiber fabric of VOC reduction rate for ammonia was 50% under 405 nm after 30 min. Conclusions: An electron-hole pair due to photoexcitation is generated in the PDA layer and transferred to the conduction band of TiO₂. This generates a superoxide radical that degrades ammonia and removes epidermal Staphylococcus aureus.

• Journal of Chest Surgery
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• 제50권4호
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• pp.242-246
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• 2017

Background: Patent ductus arteriosus (PDA) ligation is usually performed by congenital cardiac surgeons. However, due to the uneven distribution of congenital cardiac surgeons in South Korea, many institutions depend solely on adult cardiac surgeons for congenital cardiac diseases. We report the outcomes of PDA ligations performed by adult cardiac surgeons at our institution. Methods: The electronic medical records of 852 neonates at Chung-Ang University Hospital, Seoul, South Korea from November 2010 to May 2014 were reviewed to identify patients with PDA. Results: Of the 111 neonates with a diagnosis of PDA, 26 (23%) underwent PDA ligation. PDAs were ligated within 28 days of birth (mean, $14.5{\pm}7.8days$), and the mean gestational age of these patients was $30.3{\pm}4.6weeks$ (range, 26 to 40 weeks) with a mean birth weight of $1,292.5{\pm}703.5g$ (range, 480 to 3,020 g). No residual shunts through the PDA were found on postoperative echocardiography. There was 1 case of 30-day mortality (3.8%) due to pneumonia, and 6 cases of in-hospital mortality (23.1%) after 30 days, which is comparable to results from other centers with congenital cardiac surgery programs. Conclusion: Although our outcomes may not be generalizable to all hospital settings without a congenital cardiac surgery program, in select centers, PDA ligations can be performed safely by adult cardiac surgeons if no congenital cardiac surgery program is available.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2004년도 추계 종합학술대회 논문집
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• pp.302-307
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• 2004

현재 무선 네트워크 환경에서 많이 사용되고 있는 PDA의 스토리지 장치의 한계를 극복하기 위해 iSCSI를 이용한 원격 스토리지 시스템이 필요하며, 계속 급증하고 있는 무선 환경에서의 보안 문제를 해결하기 위해 IPSec 적용이 필요하다. 본 논문 에서는 PDA 상에서 원격 스토리지 시스템을 사용하기 위한 iSCSI와 보안을 위한 IPSec를 각각 설계, 구현하고 실제 환경에서의 실험을 통해 성능을 알아본다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 D
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• pp.2453-2456
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• 2004

People want to control various facilities regardless location in ubiquitous era. Therefore we have a various devices embedded wireless functions. In this paper we implement a control program in a PDA that used Wireless LAN among wireless protocols. The objectives of this paper are: The first, to make a control program in server and a wireless client (PDA) using WLAN. The second, to implement smart home model. The third, to propose useful functions in home controls.

• 대한기계학회논문집B
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• 제21권9호
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• pp.1198-1206
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• 1997

The flow characteristics of an intermittent fuel injection into a stationary ambient air were investigated using gasoline. The measurements were made by two-channel, air cooling type Phase Doppler Anemometer(PDA) system (DANTEC, 750 MW). And a pintle type injector of MPI (Multi-point Port Injection) system was utilized as a fuel injector. The PDA receiver optic was set up in a 60.deg. C forward scatter arrangement to obtain the optimum scattering signal of fuel droplets. The data were obtained by synchronizing PDA system with the fuel injection period, and the axial and radial velocity and turbulent components of fuel droplets were mainly measured for the analysis of temporal and spatial distribution depending upon the fuel injection pressures.

• 한국지능시스템학회논문지
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• 제16권4호
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• pp.430-435
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• 2006

본 논문은 유비쿼터스 컴퓨팅 환경 기반에서의 얼굴과 서명을 이용한 다중생체인식 시스템을 제안한다. 이를 위해서 얼굴과 서명 영상은 PDA로 획득하고, 취득한 영상은 무선랜을 통해 인증 서버로 전송하여 서버로부터 인증된 결과를 받도록 하였다. 구현한 다중 생체 인식 시스템의 구성은 두 부분으로 나눌 수 있는데, 먼저 클라이언트 부문인 PDA 에서는 임베디드 비주얼 C++로 작성된 사용자 인터페이스 프로그램을 통하여 사용자 등록과 인증 과정을 수행한다. 그리고, 서버 부문에서는 얼굴인식에서 우수한 성능을 보이는 PCA와 LDA 알고리즘을 사용하였고, 서명인식에서는 구간 분할 매칭으로 구간을 분할 한 후 X축과 Y 축의 투영값을 Kernel PCA와 LDA 알고리즘에 적용하였다. 얼굴과 서명영상을 이용하여 제안된 알고리즘을 평가한 결과 기존의 단일 생체인식 기법에 비해 우수한 결과를 보임을 확인할 수 있었다.

• 한국멀티미디어학회논문지
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• 제8권2호
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• pp.225-232
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• 2005

PDA는 저장 공간이 제약적이고 입력을 위해 펜 기반장치를 사용해야 하므로 불편함을 지닌다. 본 논문에서는 이러한 불편함을 보완하기 위하여 기존의 음성인식 시스템을 XML(extensible Markup Language) 웹 서비스로 제공하고, PDA에서 음성인식 웹 서비스를 요청함으로써 음성명령이 가능하도록 구현하였다. 본 시스템의 구성은 모바일 클라이언트와 음성인식 웹 서비스 프로바이더로 되어 있다. 모바일 클라이언트는 사용자정보와 음성 데이터를 DIME(Direct Internet Message Encapsulation)을 이용하여 음성 인식 웹 서비스 프로바이더를 요청한다. 음성 인식 웹 서비스 프로바이더는 인증된 클라이언트에 한하여 음성 인식 결과와 사용자명을 반환하는 서비스를 제공한다. 따라서 이 시스템은 PDA에서 대용량의 음성 DB나 음성인식 시스템을 직접 탑재하지 않고도 음성인식 서비스를 이용할 수 있다.