• 한국위성정보통신학회논문지
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• 제7권1호
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• pp.39-47
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• 2012

현재의 주파수 분배상황을 살펴보면 대부분의 주파수 대역이 고정 할당되어 있으며 특히 무선통신 환경에 가장 적합한 저주파 대역은 거의 사용할 여지가 없다. 이에 인지무선 기술은 무선통신환경에서 주파수 부족 문제를 해결하고 주파수 활용도를 높이기 위한 중요한 기술로 대두되고 있다. 본 논문에서는 SDR (Software Define Radio)플랫폼인 USRP (Universal Software Radio Peripheral) 보드와 SDR 개발 툴킷인 GNU Radio를 이용하여 실제 인지무선(Cognitive Radio : CR) 시스템에서 데이터를 송, 수신하였다. 구체적으로 스펙트럼 센싱 기술을 이용하여 면허 사용자의 주파수 사용 여부를 감지하여 이 정보를 데이터베이스로 넘겨준다. 정보를 넘겨받은 데이터베이스에서는 유전자 알고리즘을 이용하여 최적의 송신전력과 대역폭, 채널 정보를 인지무선 기기에 보내어 주어 인지무선 기기가 면허 사용자에게 아무런 간섭을 주지 않고 데이터 통신을 할 수 있도록 하였다.

• 한국인터넷방송통신학회논문지
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• 제23권2호
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• pp.51-59
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• 2023

추적 레이다 시스템은 지상, 함정, 항공기 등에 탑재되어 운용되며 주변의 전자장치들과의 전자기파 간섭에 대한 내성 설계가 필요하다. 특히 함정에 설치되는 추적레이다 및 항공기에 탑재되는 추적레이다의 경우 주변 여러 창치들과 전원 라인과 통신 라인으로 전기적 연결이 되어 있다. 이러한 경우 추적레이다와 연결된 케이블에 의한 전자기파 간섭에 의한 다른 장비들의 오동작을 방지하기 위하여 케이블 연결에 대한 방사규격과 내성규격을 만족해야 한다. 또한 추적레이다에서 생성되어 방사되는 전자기파 잡음이 주변장치에 영향을 주지 않도록 방사 규격 또한 만족해야 하여 주변 장치에서 방사되어 입력되는 전자기파에 대한 내성 규격을 만족 해야 한다. 본 논문에서는 CE, CS, RE, RS를 포함하는 MIL-STD-461G를 만족하기 위한 설계를 제시하고 시험을 통하여 설계 만족에 대하여 설명한다.

• International journal of advanced smart convergence
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• 제9권1호
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• pp.37-46
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• 2020

Cerebral vascular surgery can damage patients' motor and sensory nerves; therefore, neuromonitoring is performed intraoperatively. Patients with diabetes often have peripheral neuropathy and may be prone to nerve damage during surgery. This study aimed to identify factors that should be considered when diabetic patients undergo intraoperative neuromonitoring during brain vascular surgery and to present new criteria. Methods: In patients with and without diabetes who underwent cerebrovascular surgery (n = 30/group), we compared the intraoperative stimulation intensity, postoperative motor power and sensory, glycated hemoglobin (HbA1c) and glucose levels, and imaging findings. Results: Fasting glucose, blood glucose, and HbA1c levels were 10%, 12.1%, and 9.7%, respectively; they were higher in patients with than in patients without diabetes. Two patients with diabetes had weakness, and 10 required increased Somato sensory evoked potential (SSEP) stimulation, while in 16, motor power recovered over time rather than immediately. The non-diabetic group had no weakness after surgery, but 10 patients required more increased SSEP stimulation. The diabetic group showed significantly more abnormal test results than the non-diabetic group. Conclusion: For patients with diabetes undergoing surgery with intraoperative neuromonitoring, whether diabetic peripheral neuropathy is present, their blood glucose level and the anesthetic used should be considered.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 학술대회 논문집 정보 및 제어부문
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• pp.417-419
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• 2004

Because of the demands for high performance and high integrated system, the needs for optimal platform becomes more importance. Optimal platform can handle more data effectively with same resources. AMBA(Advanced Microprocessor Bus Architecture)$^{TM}$ defines on-chip communication standard for designing high performance embedded micro-controllers. It is consisted of AHB, ASB and APB. It can support fast implementation and reliability in system that is composed with reusable IPs. DMAC is one of master in system and generate master signals of AHB to communicate data from one slave(peripheral or memory) to another slave. It can reduce burden of CPU and increase system performance. We designed DMAC based on AMBA and it supports 13 Channels. Each channel can be controlled by software program. It decides channel's priority using round-robin method. It can support P2P, P2M, M2P and P2P communication.

• Journal of Chest Surgery
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• 제17권4호
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• pp.747-752
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• 1984

Bronchopleural fistula is the communication between a bronchus or bronchiole and the pleural space, clinically bronchopleural fistula is usually combined with infection. But pneumothorax is the communication between a peripheral air space such as a ruptured bleb, and the pleural space. The author studies on the 62 bronchopleural fistula patients who were admitted to P.N.U.H. from 1974 to October, 1984 according to causative mechanism which was postresectional origin, non resectional surgical origin and spontaneous origin, and its underlying diseases. The following results were obtained. 1.The causes of BPF: 5.16% was spontaneous origin, 30.6% was postresectional origin, 17.7% was other surgical origin. 2.The causes of BPF after resectional operation: 42.1% was tuberculosis, 21.1% was tumor resectional case. 3.The proper operational method for BPF was thoracoplasty with myoplasty. 4.The average operation for BPF was 2.7 times.

• Journal of Chest Surgery
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• 제48권6호
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• pp.404-406
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• 2015

Gebode defect, that can accurately be treated surgical repair, is defined as a true communication between left ventricle and right atrium. A 74-year-old woman with a worsening history of ortophnea and peripheral edema was hospitalised. A communication between right atrium and left ventricle was diagnosed using transeusophageal echocardiography. The defect was repaired and mitral valve was replaced with a biologic valve. It would be beter to tailor surgical strategy for each case with atrioventricular canal defect after preoperative transeusophageal echocardiography and peroperative direct sight.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.1563-1567
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• 2005

The Home network system means that information appliances, Home PCs, etc., using wired or wireless network method enable to control and share with peripheral devices such as internet, shared data, a scanner and a printer, and it is networking solution, which intelligent communication will be possible as the system which can do a remote control such as TV Set, refrigerators, air conditioners, DVD players, digital camcorders based on external network using an internet, a potable information terminal and a mobile phone whenever, wherever and freely. In this study, the home network interface solution is used one of the wired network standards, PLC (Power-Line Communication) technology, so we can construct of intelligent home network's home controller without re-build a network at home. On keeping with current waves of thought, we will focus on a home controller development with great interest which is enabled to do an effective managed control, applying intelligent home network technology which can be new paradigm like a cyber apartment.

• Journal of information and communication convergence engineering
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• 제6권1호
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• pp.73-79
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• 2008

Result that study magnet nerve curer for treatment induced current generation and current of ion for development in main point incontinence, prostate, sphincter, nervous system, rigidity, headache, retrogression arthritis, ligament damage, Rheumatism arthritis, peripheral nerve etc., can classify by 4. Embodied do first, full bridge magnet occurrence chapter, and communication with PC is available, confirmed various action loops an experiment. Could confirm correct treatment probe second, woman and man disease person. Third, derived so that healing may be possible naturally by addition of apron form according to disease. Because composition of finally, treatment probe composes by act of negative plate form, manufacture is easy and cooling designed for easy direction. More superior result of cooling appeared than existing in incidental and ingredients, cooling efficiency, composition, complexity, convenience etc. that expense and composition manufacture very straightforwardly and experimental by 2 - Tank ways.

• 한국인터넷방송통신학회논문지
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• 제11권6호
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• pp.319-324
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• 2011

본 논문에서는 혈압과 광용적맥파, 국부피부온도변화에 따른 심혈관 파라메터의 통계적 변화와 관계에 대해 연구하였다. 국부피부온도변화는 Finometer의 혈압, 광용적맥파 그리고 총말초저항에 영향을 주었고 오실로메트릭 혈압, 심박수, 심박출량에는 영향을 주지 않는 결과를 얻었다. 그러므로 온도변화가 있는 환경에서 에러를 줄이기 위해 심혈관계의 상태를 광용적맥파로 평가하기위해서는 온도를 제어하거나 보상해 주어야 한다.

• International Journal of Internet, Broadcasting and Communication
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• 제15권2호
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• pp.248-253
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• 2023

Nowadays, with the spread of the Internet and the emergence of high-performance computers and various peripheral devices, our society is undergoing great changes. In the field of education, various types of education using smart education infrastructure are being conducted. The spread of the Internet and the development of various devices have problems that can lead to addiction due to excessive Internet use. Most of the problems that appear in adolescence are immersed in games, which can affect academic achievement. Therefore, in this study, the effect of excessive Internet use on students' academic achievement was studied. The survey for the study was conducted through a questionnaire survey, and the subjects of the survey were high school students majoring in humanities. As a result, the relationship between academic achievement and Internet addiction was low in the middle, upper, and lower groups in the general user group. Also, in the highrisk user group, it appeared high in the order of middle, low, and high.