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전재한(Jaehan Jeon),최아라(Ara Choi),박성훈(Sunghoon Park),정태영(Taeyoung Chung) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
As an autonomous driving technology is the future of on-road driving, an unmanned valet parking system is one of a key technology to realize door to door autonomous vehicle. When an autonomous vehicle arrive its destination, the driver steps out of the car and pushes button on the smart phone, and then the vehicle autonomously parking in without any anxiety of user. Similarly, the vehicle gets out from the parking lot at right time and right position for user. We mainly focused on a vehicle actuator control, path following control for parking slot detection, parking maneuver control with shift-by-wire system, and smart phone interface between the user and vehicle. As the localization technology of a vehicle at the indoor or outdoor parking areas is most important and difficult problem, we applied precise position information from the DGPS for preliminary implementation of the system.
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김수용(Suyong Kim),이동욱(Dongwook Lee),박성훈(Sunghoon Park),권재희(Jaehee Kwon) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Recently many automobile companies are developing parking assist system as it improves the convenience of drivers. Among several types of parking assistance system, the method using ultrasonic sensors for detecting parking space is widely used because of its low cost and usefulness. In order to detect the parking space, the parking space detection algorithm provides the width and the length of the parking space using long range ultrasonic sensor. In this paper, to detect the accurate parking space with the curbstone, the curbstone detection algorithm is proposed. The performances of the proposed algorithm are verified and evaluated by experiments.
A Multicenter Study of Pertussis Infection in Adults with Coughing in Korea: PCR-Based Study
Park, Sunghoon,Lee, Myung-Gu,Lee, Kwan Ho,Park, Yong Bum,Yoo, Kwang Ha,Park, Jeong-Woong,Kim, Changhwan,Lee, Yong Chul,Park, Jae Seuk,Kwon, Yong Soo,Seo, Ki-Hyun,Kim, Hui Jung,Kwak, Seung Min,Kim, Ju- The Korean Academy of Tuberculosis and Respiratory 2012 Tuberculosis and Respiratory Diseases Vol.73 No.5
Background: Limited data on the incidence and clinical characteristics of adult pertussis infections are available in Korea. Methods: Thirty-one hospitals and the Korean Centers for Disease Control and Prevention collaborated to investigate the incidence and clinical characteristics of pertussis infections among adults with a bothersome cough in non-outbreak, ordinary outpatient settings. Nasopharyngeal aspirates or nasopharyngeal swabs were collected for polymerase chain reaction (PCR) and culture tests. Results: The study enrolled 934 patients between September 2009 and April 2011. Five patients were diagnosed as confirmed cases, satisfying both clinical and laboratory criteria (five positive PCR and one concurrent positive culture). Among 607 patients with cough duration of at least 2 weeks, 504 satisfied the clinical criteria of the US Centers for Disease Control and Prevention (i.e., probable case). The clinical pertussis cases (i.e., both probable and confirmed cases) had a wide age distribution ($45.7{\pm}15.5$ years) and cough duration (median, 30 days; interquartile range, 18.0~50.0 days). In addition, sputum, rhinorrhea, and myalgia were less common and dyspnea was more common in the clinical cases, compared to the others (p=0.037, p=0.006, p=0.005, and p=0.030, respectively). Conclusion: The positive rate of pertussis infection may be low in non-outbreak, ordinary clinical settings if a PCR-based method is used. However, further prospective, well-designed, multicenter studies are needed.
In Vitro Antimicrobial Susceptibility of <i>Mycobacterium abscessus</i> in Korea
Park, Sunghoon,Kim, Shinok,Park, Eun Mi,Kim, Hojoong,Kwon, O Jung,Chang, Chulhun L.,Lew, Woo Jin,Park, Young Kil,Koh, Won-Jung The Korean Academy of Medical Sciences 2008 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.23 No.1
<P><I>Mycobacterium abscessus</I> is the second most common etiology of pulmonary disease caused by nontuberculous mycobacteria in Korea. Although antimicrobial susceptibility tests are important for appropriate patient management in <I>M. abscessus</I> lung disease, the tests have never been investigated in Korea. Seventy-four isolates of <I>M. abscessus</I> recovered from patient respiratory samples were tested against eight antimicrobial agents following the guidelines set forth by the National Committee for Clinical Laboratory Standards. Of the parenteral antibiotics, amikacin (99%, 73/74) and cefoxitin (99%, 73/74) were active against most isolates. Imipenem (55%, 36/66) and tobramycin (36%, 27/74) had activity against moderate number of isolates. Of the oral antibiotics, clarithromycin (91%, 67/74) was active against the majority of isolates. Moxifloxacin (73%, 54/74) and ciprofloxacin (57%, 42/74) had activity against a moderate number of isolates. Doxycycline was the least active, inhibiting only 7% (5/74) of isolates. In conclusion, the variations in susceptibility within <I>M. abscessus</I> isolates to currently available antimicrobials suggest that the antimicrobial susceptibilities of any clinically significant <I>M. abscessus</I> isolate be needed individually.</P>
High-response and selective hydrogen sensing properties of porous ZnO nanotubes
Sunghoon Park 한국물리학회 2016 Current Applied Physics Vol.16 No.10
Hydrogen gas is utilized in various industrial fields, and its utility in modern life is becoming a reality since the development of hydrogen fuel cell vehicles. However, hydrogen gas is extremely explosive at room temperature and requires cautious handling. Herein, a ZnO nanotube sensor was fabricated via a three step process; this sensor exhibited high response and selectively detected hydrogen gas owing to its large surface area and grain boundaries. The response of this sensor was quantified as 139.11 when 1000 ppm H2 gas was supplied to the sensor. A porous ZnO nanotube sensor was fabricated and the mechanism by which enhanced hydrogen sensing is achieved was evaluated.
Park, Sunghoon,Kim, Soohyun,Kheel, Hyejoon,Lee, Chongmu Elsevier 2016 Sensors and actuators. B, Chemical Vol.222 No.-
<P><B>Abstract</B></P> <P>ZnO/Co<SUB>3</SUB>O<SUB>4</SUB> (ZnO/Co<SUB>3</SUB>O<SUB>4</SUB> =4:1) composite nanoparticles were synthesized via a facile solvothermal route. The 4:1 ZnO/Co<SUB>3</SUB>O<SUB>4</SUB> composite nanoparticle network sensor showed significantly enhanced NO<SUB>2</SUB> gas sensing performance compared to its pure ZnO nanoparticle sensor counterpart. The ZnO/Co<SUB>3</SUB>O<SUB>4</SUB> composite nanoparticle sensor showed responses of 346–1602% to 0.1–5ppm of NO<SUB>2</SUB> at room temperature under UV illumination at 3.7mW/cm<SUP>2</SUP>, whereas ZnO nanoparticle sensors showed responses of 264–707%. The former also showed faster response to NO<SUB>2</SUB> gas and higher selectivity to NO<SUB>2</SUB> gas than the latter. The responses of the sensors to NO<SUB>2</SUB> increased with increasing UV illumination intensity. In addition, the underlying mechanism for the enhanced sensing performance of the ZnO/Co<SUB>3</SUB>O<SUB>4</SUB> composite nanoparticle sensor toward a strong oxidizing gas NO<SUB>2</SUB> under UV illumination was examined. Particular emphasis was placed on the role of the p/n junction in the composite nanoparticle sensor.</P>