커튼의 騷音防止 效果에 관한 硏究

정승민,김태훈 영남대학교 자원문제연구소 1992 資源問題硏究 Vol.11 No.-

This study is intended to examine how the space of double curtains, the number, the form of curtain fold and the material's properties are related to the amount of sound reduction. In the anechoic chamber and general home, the results obtained from measurement and analysis of the difference between incident sound (dB) and transported sound (dB) by Rionn Sound Level Meter NA-20 and ANOVA table are as followings. 1. The larger the space of double curtains, the larger the amount of sound reduction. 2. Curtain without fold have the largest amount of sound reduction. 3. The smaller the length of fold, the larger the amount of sound reduction. 4. The larger the space between folds, the larger the amount of sound reduction. 5. The smaller the air permeabilty, the larger the amount of sound reduction.

용량성 지문센서를 위한 저전력 감지회로

정승민,Jung, Seung-Min 한국정보통신학회 2011 한국정보통신학회논문지 Vol.15 No.6

본 논문에서는 개선된 회로를 적용한 용량성 센서용 저전력 전하분할 방식의 지문센서 감지회로를 제안하고 있다. 제안된 회로는 기존회로에 비하여 전력소모를 크게 줄이고 융선과 골간의 감지전압차를 확대하였다. 설계된 회로는 40MHz 동작주파수, 3.3V 전원에 $0.35{\mu}m$ 표준 CMOS 공정 파라미터를 적용하여 시뮬레이션을 실시하였다. 검증결과 47% 전력소모 감소를 보였고 융선과 골간의 감지 전압 차에 있어서 90% 증가를 나타내었다. 제안된 회로는 면적의 증가 없이 기존 픽셀 레이아웃에 구현되었다. A modified capacitive detection circuit of charge sharing scheme is proposed, which reduces the static power dissipation and increases the voltage difference between a ridge and valley more than a conventional circuit. The detection circuit is designed and simulated in 3.3V, $0.35{\mu}m$ standard CMOS process, 40MHz condition. The result shows about 47% power dissipation reduction and 90% improvement of difference between a ridge and valley sensing voltage. The proposed circuit is layout without area increasing of a one pixel.

$256{\times}256$ 픽셀 어레이 저항형 지문센서

정승민,Jung, Seung-Min 한국정보통신학회 2009 한국정보통신학회논문지 Vol.13 No.3

본 논문에서는 개선된 회로를 적용한 $256{\times}256$ 픽셀 저항형 지문센서를 제안하고 있다. 단위 픽셀 수준의 센싱회로는 가변적인 전류를 전압으로 변환하여 이진 디지털 신호로 만든다. 정전기에 효과적으로 대처할 수 있는 인접 픽셀 간 전기적 차폐 레이아웃 구조를 제안하고 있다. 전체회로는 단위 센서 회로를 확장하여 ASIC 설계방식을 통하여 설계한 뒤 로직 및 회로에 대하여 모의실험을 하였다. 전체회로는 $0.35{\mu}m$ 표준 CMOS 공정규칙을 적용하여 센서블록은 전주문 방식을 적용하고 전체 칩은 자동배선 툴을 이용하여 반주문 방식으로 레이아웃을 실시하였다. In this paper, we propose $256{\times}256$ pixel array fingerprint sensor with an advanced circuits for detecting. The pixel level simple detection circuit converts from a small and variable sensing current to binary voltage out effectively. We minimizes an electrostatic discharge(ESD) influence by applying an effective isolation structure around the unit pixel. The sensor circuit blocks were designed and simulated in standard CMOS $0.35{\mu}m$ process. Full custom layout is performed in the unit sensor pixel and auto placement and routing is performed in the full chip.

Power & Energy Society General Meeting (PES-GM 2013) 참관기

정승민,이재형 대한전기학회 2013 전기의 세계 Vol.62 No.10

Aggravation of Hepatopulmonary Syndrome after Sildenafil Treatment in a Patient with Coexisting Portopulmonary Hypertension

정승민,이경호,장성아,김덕경 대한심장학회 2015 Korean Circulation Journal Vol.45 No.1

Hepatopulmonary syndrome (HPS) and portopulmonary hypertension (PPHTN) are complications of portal hypertension and cirrhosis. Their pathophysiological mechanisms clearly differ. HPS is characterized by a defect in arterial oxygenation induced by pulmonary vasculardilatation. In contrast, PPHTN is predominantly due to excessive pulmonary vasoconstriction and vascular remodeling, but is rarely associatedwith hypoxia. We report a case of a patient who had both HPS and PPHTN at the time of presentation. HPS was aggravated after sildenafiladministration for the treatment of PPHTN. We demonstrated increased amount of intrapulmonay shunt after sildenafil challengeby using agitated saline contrast transthoracic echocardiography.

Effect of Testosterone Replacement Treatment in Testosterone Deficiency Syndrome Patients with Metabolic Syndrome

정승민,함병국,박민구,오미미,윤덕기,김제종,문두건 대한비뇨의학회 2011 Investigative and Clinical Urology Vol.52 No.8

Purpose: This study was conducted to investigate the effect of testosterone replacement treatment (TRT) in testosterone deficiency syndrome (TDS) patients with metabolic syndrome. Materials and Methods: We reviewed the data of 200 men who were diagnosed with TDS and were undergoing TRT between August 2006 and August 2009. The 200 patients were divided into two groups (group 1: 71 patients with metabolic syndrome, group 2: 129 patients without metabolic syndrome) depending on metabolic syndrome, which was diagnosed according to the NCEP III criteria for Asians. Age, BMI (body mass index), waist circumference, serologic tests, AMS (the Aging Males' Symptoms scale), and IIEF (International Index of Erectile Function) were measured. Results: In group 1, waist circumference and fasting glucose were significantly decreased; hemoglobin and total testosterone were increased; and the somatovegetative scale score of the AMS, the total AMS score, the erectile function score of the IIEF, the overall satisfaction score of the IIEF, and the total IIEF score were significantly improved after TRT. On the other hand, in group 2, waist circumference, BMI, total cholesterol, LDL, and fasting glucose were significantly decreased; hemoglobin and total testosterone were increased; and the 2 subscale scores of the AMS (psychologic and somatovegetative), the total AMS score, all subscale scores of the IIEF, and the total IIEF score were significantly improved after TRT. Conclusions: Overall, the patients who had TDS with metabolic syndrome showed less improvement in AMS, IIEF, and serum variables. Therefore, the correction of metabolic syndrome, such as diabetes, obesity, and hypertension, should be considered during TRT. Purpose: This study was conducted to investigate the effect of testosterone replacement treatment (TRT) in testosterone deficiency syndrome (TDS) patients with metabolic syndrome. Materials and Methods: We reviewed the data of 200 men who were diagnosed with TDS and were undergoing TRT between August 2006 and August 2009. The 200 patients were divided into two groups (group 1: 71 patients with metabolic syndrome, group 2: 129 patients without metabolic syndrome) depending on metabolic syndrome, which was diagnosed according to the NCEP III criteria for Asians. Age, BMI (body mass index), waist circumference, serologic tests, AMS (the Aging Males' Symptoms scale), and IIEF (International Index of Erectile Function) were measured. Results: In group 1, waist circumference and fasting glucose were significantly decreased; hemoglobin and total testosterone were increased; and the somatovegetative scale score of the AMS, the total AMS score, the erectile function score of the IIEF, the overall satisfaction score of the IIEF, and the total IIEF score were significantly improved after TRT. On the other hand, in group 2, waist circumference, BMI, total cholesterol, LDL, and fasting glucose were significantly decreased; hemoglobin and total testosterone were increased; and the 2 subscale scores of the AMS (psychologic and somatovegetative), the total AMS score, all subscale scores of the IIEF, and the total IIEF score were significantly improved after TRT. Conclusions: Overall, the patients who had TDS with metabolic syndrome showed less improvement in AMS, IIEF, and serum variables. Therefore, the correction of metabolic syndrome, such as diabetes, obesity, and hypertension, should be considered during TRT.

픽셀단위 자동보상회로가 적용된용량형 지문센서의 CMOS구현

정승민 대한전자공학회 2007 電子工學會論文誌-SD (Semiconductor and devices) Vol.44 No.3

We propose a pixel-level automatic calibration circuit scheme that initializes a capacitive fingerprint sensor LSI to eliminate the influence of the surface condition and environment, which is degraded by dirt during long-time use, process variation and ambient temperature. The sample chip is fabricated on 0.35μm standard CMOS process. The calibration is executed by optimizing the reference voltage in each pixel to make the sensor signals of all pixels the same. The calibration control circuit is composed of the sensing circuit and charge pumping circuit, and calibrates all pixels in a short time. 16-level gray scale fingerprint images can be captured to increase the accuracy of identification. This confirms that the scheme is effective for capturing consistent clear images during long-time use. 본 논문에서는 지문센서의 주변환경 변화에 따른 획득 이미지의 왜곡을 보상하기 위한 픽셀 수준의 자동보상회로를 설계하고 0.35μm CMOS공정을 적용하여 칩으로 구현하였다. 적용된 센서는 48x48 픽셀의 용량형 센서로서 센서의 출력 전압과 기준전압을 비교하여 이진의 영상을 출력하게 된다. 기준전압을 제어하여 왜곡된 이미지를 보상하기 위한 알고리즘을 제안하였으며 기준전압제어를 위하여 기존의 DAC와 같은 복잡한 회로 대신 비휘발성 메모리에 적용되는 승압회로를 픽셀별로 적용하였다. 본 논문에서는 승압회로에 의한 이미지보상효과를 얻을 수 있었으며 아울러 16단계의 회색 이미지를 얻음으로써 지문의 인증율을 높일 수 있었다.

NCA 물성에 따른 극미세 피치 COG (Chip on Glass) In, Sn 접합부의 신뢰성 특성평가

정승민,김영호,Chung Seung-Min,Kim Young-Ho 한국마이크로전자및패키징학회 2006 마이크로전자 및 패키징학회지 Vol.13 No.2

NCA의 물성이 미세피치 Chip on glass (COG) 접합부의 신뢰성에 미치는 영향을 연구하였다. Si 위에 Sn을, 유리기판 위에 In을 열증발 방법으로 증착하고 lift-off 방법을 이용하여 $30{\mu}m$ 피치를 가지는 솔더범프를 형성하였으며 열압착 방법으로 $120^{\circ}C$에서 In 범프와 Sn 범프를 접합하였다. 접합할 때 세 종류의 Non conductive adhesive (NCA)를 적용하였다. 신뢰성은 $0^{\circ}C$와 $100^{\circ}C$ 사이로 열충격시험을 2000회까지 실시하여 평가하였다. 4단자 저항측정법을 이용하여 접합부의 저항을 측정하였다. 필러의 양이 증가할수록 열충격시험 후 접합부의 저항이 가장 적게 증가하여 신뢰성이 우수하였다. 필러의 양이 증가할수록 NCA의 열팽창이 작아지기 때문이다. We developed a bonding at low temperature using fine pitch Sn and In bumps, and studied the reliability of the fine pitch In-Sn solder joints. The $30{\mu}m$ pitch Sn and In bumps were joined together at $120^{\circ}C$. A non conductive adhesive (NCA) was applied during solder joining. Thermal cycling test ($0^{\circ}C-100^{\circ}C$, 2 cycles/h) of up to 2000 cycles was carried out to evaluate the reliability of the solder joints. The bondability was evaluated by measuring the contact resistance (Rc) of the joints through the four point probe method. As the content of filler increased, the reliability improved in the solder joints during thermal cycling test because the contact resistance increased little. The filler redistributed the stress and strains from the thermal shock over the entire joint area.

The Risk of Diabetes on Clinical Outcomes in Patients with Coronavirus Disease 2019: A Retrospective Cohort Study

정승민,이인영,하은영,윤지성,원규장,이형우,허지안,홍경수,장종걸,진현정,최은영,신경철,정진홍,이관호,안준홍,문준성 대한당뇨병학회 2020 Diabetes and Metabolism Journal Vol.44 No.3

Background: To determine the role of diabetes mellitus (DM) in the coronavirus disease 2019 (COVID-19), we explored the clinical characteristics of patients with DM and compared risk factors such as age, glycemic control, and medications to those without DM. Methods: This was a retrospective cohort study of 117 confirmed patients with COVID-19 which conducted at a tertiary hospital in Daegu, South Korea. The primary outcome was defined as the severe and critical outcome (SCO), of which the composite outcomes of acute respiratory distress syndrome, septic shock, intensive care unit care, and 28-day mortality. We analyzed what clinical features and glycemic control-related factors affect the prognosis of COVID-19 in the DM group. Results: After exclusion, 110 participants were finally included. DM patients (n=29) was older, and showed higher blood pressure compared to non-DM patients. DM group showed higher levels of inflammation-related biomarkers and severity score, and highly progressed to SCO. After adjustment with other risk factors, DM increased the risk of SCO (odds ratio [OR], 10.771; P<0.001). Among the DM patients, SCO was more prevalent in elderly patients of ≥70 years old and age was an independent risk factor for SCO in patients with DM (OR, 1.175; P=0.014), while glycemic control was not. The use of medication did not affect the SCO, but the renin-angiotensin system inhibitors showed protective effects against acute cardiac injury (OR, 0.048; P=0.045). Conclusion: The COVID-19 patients with DM had higher severity and resulted in SCO. Intensive and aggressive monitoring of COVID-19 clinical outcomes in DM group, especially in elderly patients is warranted.

말하는 것보다 듣는 게 우선이다

정승민 샘터사 2019 월간 샘터 Vol.588 No.-