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고속 멀티미디어 통신시스템을 위한 효율적인 FFT 알고리즘 및 하드웨어 구현
정윤호,김재석 대한전자공학회 2004 電子工學會論文誌-SD (Semiconductor and devices) Vol.41 No.03
In this paper, we propose an efficient FFT algorithm for high speed multimedia communication systems, and present its pipeline implementation results. Since the proposed algorithm is based on the radix-4 butterfly unit, the processing rate can be twice as fast as that based on the radix-23 algorithm. Also, its implementation is more area-efficient than the implementation from conventional radix-4 algorithm due to reduced number of nontrivial multipliers like using the radix-23 algorithm. In order to compare the proposed algorithm with the conventional radix-4 algorithm, the 64-point MDC pipelined FFT processor based on the proposed algorithm was implemented. After the logic synthesis using 0.6㎛ technology, the logic gate count for the processor with the proposed algorithm is only about 70% of that for the processor with the conventional radix-4 algorithm. Since the proposed algorithm can be achieve higher processing rate and better efficiency than the conventional algorithm, it is very suitable for the high speed multimedia communication systems such as WLAN, DAB, DVB, and ADSL/VDSL systems. 본 논문에서는 고속 멀티미디어 통신 시스템을 위한 효율적인 FFT 알고리즘과 이의 하드웨어 구현 결과를 제시한다. 제안된 알고리즘은 radix-4 버터플라이 연산자를 기반으로 구현되어 기존의 radix-2 버터플라이 연산자 기반의 알고리즘에 비해 2배의 처리율(processing rate)을 갖으며, 또한 radix-23 알고리즘의 비단순 승산기의 수를 줄이는 특성을 그대로 이용하므로, 같은 처리율을 갖는 radix-4 알고리즘에 비해 저면적 구현이 가능한 장점을 갖는다. 제안된 알고리즘의 하드웨어 구현 및 검증을 위해 VHDL 언어를 이용하여 MDC 파이프라인 구조를 갖는 64-point FFT 프로세서를 설계하였다. 0.6㎛ 공정을 이용하여 논리 합성한 결과, 제안된 알고리즘을 이용하여 구현한 경우, 기존의 radix-4 알고리즘을 이용하여 구현하는 경우보다 약 30%정도 면적 면에서 이득을 얻을 수 있음을 확인하였다. 고속 동작이 가능하며 동시에 면적 효율적인 특성으로 인해, 제안된 알고리즘은 무선 LAN 시스템, DAB 및 DVB 시스템, ADSL/VDSL 시스템 등 고속 멀티미디어 통신 시스템에 적합한 알고리즘이라 할 수 있다.
경기지역 외국인 근로자의 인터넷을 통한 보건정보 이용행태
정윤호 대한건설보건학회 2020 대한건설보건학회지 Vol.2 No.1
Purpose: The purpose of this study is to find an efficient way to provide health information to foreign workers by identifying the health information usage behavior of foreign workers through the internet and analyzing factors that affect foreign workers' experience of using health information through the internet. Methods: This study performed a survey targeting for 350 migrant workers in Korea, who visited for receiving the medical treatment of free medical examination and treatment, provided by Migrant Health Association in Korea in December 2007, and analyzed the use experience of health information through the internet by the workers. Results: The results of this study are as follow, with respect to the place of using the internet, the workers who use PC room showed 8.298 times more use experience than the workers who use public places. Those who use the internet almost every day showed 10.28 times more than those who do not use the internet. The workers who agreed with the needs of providing health information in their mother language on the internet in Korea showed 2.566 times more than those who did not agreed. Those who have an intention to participate in the offer of health information by e-mail showed 4.659 times more use experience in the internet health information than those who do not have. Conclusion: As the results of this study, it is thought that if the migrant workers obtain health information through the internet, it will be helpful for the improvement of healthy life. In order for the workers to acquire such health information through the internet, it is considered that it needs to provide the Internet health information written in various languages.
Endoscopic Management of Iatrogenic Colon Perforation
정윤호 대한소화기내시경학회 2020 Clinical Endoscopy Vol.53 No.1
Colon perforations are diffcult to resolve because they occur unexpectedly and infrequently. If the clinician is unprepared or lackstraining in dealing with perforations, the clinical prognosis will be affected, which can lead to legal issues. We describe here the properapproach to the management of perforations, including deciding on endoscopic or surgical treatment, selection of endoscopic devices,endoscopic closure procedures, and general management of perforations that occur during diagnostic or therapeutic colonoscopy.
정윤호 대한소화기학회 2019 대한소화기학회지 Vol.73 No.6
Because gastrointestinal (GI) endoscopy examinations are being performed increasingly frequently, the rate of detection of cancer and of precancerous lesions has increased. Moreover, development of more advanced endoscopic technologies has expanded the indications for, and thus frequency of, therapeutic endoscopic procedures. However, the incidence of complications associated with diagnostic or therapeutic GI endoscopy has also increased. The complications associated with GI endoscopy can be ameliorated by endoscopic or conservative treatment, but caution is needed as some of the more serious complications, such as perforation, can lead to death. In this chapter, we review the possible complications of GI endoscopy and discuss methods for their prevention and treatment.
Role of Endoscopic Gastroplasty Techniques in the Management of Obesity
정윤호 대한소화기내시경학회 2017 Clinical Endoscopy Vol.50 No.1
Health and wellness represent a major global concern. Trends such as a lack of exercise and excessive consumption of calories are major causes of the rapid increase in obesity worldwide. Obesity should be controlled because it can result in other illnesses, such as diabetes, high blood pressure, high cholesterol, coronary artery disease, stroke, breathing disorders, or cancer. However, many people have difficulty in managing obesity through exercise, dietary control, behavioral modifications, and drug therapy. Bariatric surgery is not commonly used due to a variety of complications, even though it has been demonstrated to produce reliable results with respect to adequate weight loss when performed using an open or a laparoscopic approach. Endoscopic bariatric procedures are emerging techniques that are less invasive and safer compared with current surgical approaches. However, the evaluation of endoluminal procedures is limited by the small number of studies and their short-term follow-up.