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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.
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.
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>
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.
Photoluminescence in MgO-ZnO Nanorods Enhanced by Hydrogen Plasma Treatment
Park, Sunghoon,Ko, Hyunsung,Mun, Youngho,Lee, Chongmu Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.11
MgO nanorods were fabricated by the thermal evaporation of $Mg_3N_2$. The influence of ZnO sheathing and hydrogen plasma exposure on the photoluminescence (PL) of the MgO nanorods was studied. PL measurements of the ZnO-sheathed MgO nanorods showed two main emission bands: the near band edge emission band centered at ~380 nm and the deep level emission band centered at ~590 nm both of which are characteristic of ZnO. The near band edge emission from the ZnO-sheathed MgO nanorods was enhanced with increasing the ZnO shell layer thickness. The near band edge emission from the ZnO-sheathed MgO nanorods appeared to be enhanced further by hydrogen plasma irradiation. The underlying mechanisms for the enhancement of the NBE emission from the MgO nanorods by ZnO sheathing and hydrogen plasma exposure are discussed.
Light assisted room temperature ethanol gas sensing of ZnO-ZnS nanowires.
Park, Sunghoon,Kim, Soohyun,Ko, Hyunsung,Lee, Chongmu American Scientific Publishers 2014 Journal of nanoscience and nanotechnology Vol.14 No.12
<P>ZnO-core/ZnS-shell nanowires were synthesized by the thermal evaporation of a mixture of ZnO and graphite powders followed by the thermal evaporation of ZnS powders. Multiple networked nanowire gas sensors were then fabricated using the core-shell nanowires. The morphology, crystal structure and sensing properties of the ZnO-core/ZnS-shell nanowires to C2H5OH gas at room temperature under ultraviolet (UV) illumination were examined. The responses of the ZnO-core/ZnS-shell nanowires to C2H5OH gas were 1.2-2.1 times higher than those of the ZnO nanowires at C2H5OH concentrations ranging from 50 to 250 ppm under UV illumination. On the other hand, the resistance of the ZnO nanowires in the dark at room temperature was too high to measure. The underlying mechanism for the enhanced gas sensing properties of the ZnO-core/ZnS-shell nanowires toward C2H5OH gas is discussed.</P>
Park, Sunghoon,An, Soyeon,Mun, Youngho,Lee, Chongmu American Chemical Society 2013 ACS APPLIED MATERIALS & INTERFACES Vol.5 No.10
<P>SnO<SUB>2</SUB>-core/ZnO-shell nanowires were synthesized using a two-step process: the synthesis of SnO<SUB>2</SUB> nanowires by the thermal evaporation of Sn powders followed by the atomic layer deposition of ZnO. The room temperature NO<SUB>2</SUB> gas sensing properties of the nanowires under ultraviolet (UV) illumination were examined. The cores and shells of the nanowires were primitive tetragonal-structured single crystal SnO<SUB>2</SUB> and wurtzite-structured single crystal ZnO, respectively. The responses of multiple networked SnO<SUB>2</SUB> nanowire sensors were increased 2–3-fold at NO<SUB>2</SUB> concentrations ranging from 1 to 5 ppm by encapsulating the nanowires with ZnO. The SnO<SUB>2</SUB>-core/ZnO-shell nanowire sensors showed a remarkably enhanced response under UV illumination. The sensing mechanism of the core/shell nanowires under UV illumination is also discussed.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2013/aamick.2013.5.issue-10/am400500a/production/images/medium/am-2013-00500a_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am400500a'>ACS Electronic Supporting Info</A></P>
Sunghoon Park,Cheol Hong Kim,In Gyu Hyun,Ki Suck Jung Korean Society of Critical Care Medicine 2006 Acute and Critical Care Vol.21 No.1
BACKGROUND: Acid-base derangement are commonly encountered in critically ill patients. This study is to investigate underlying mechanisms of acid-base imbalance and also to examine whether they can predict mortality in burn patients. METHODS: We retrospectively reviewed 73 severely burned patients who had admitted to burn intensive care unit, from January to July in 2004. All the patients had inhalation injury, identified by bronchoscopic examination. We analyzed the type and nature of the acid-base imbalances from arterial blood gas analysis, electrolytes and other biological tests between survivors and non-survivors for 30 days after admission. RESULTS: Acidosis was the most common disorder during the early and late hospital periods. Large fractions of those showed decreased strong ion difference (SID), increased anion gap corrected by albumin (AGc) and [Cl-]corrected. Mixed disorder and alkalosis emerged after the 7(th) hospital day. As time went by, albumin, PaO2/FiO2 ratio, pH and SID were more decreased in non-survivors (n=28) than in survivors (n=45) while [Cl-] corrected, alveolar-arterial oxygen tension gradients, peripheral WBC counts and CRP were more increased in non-survivors than in survivors. In the area under the receiver operating characteristic curves for mortality prediction, APACHE II score and % of total body surface area (%TBSA) burn were high: 0.866 (95% CI; 0.785~0.946) for APACHE II score, 0.817 (95% CI; 0.717~0.918) for %TBSA burn. CONCLUSIONS: In burned patients with inhalation injury, various types of acid-base imbalances and electrolytes abnormalities emerged after resuscitation and so, more careful attentions pursued for correcting underlying acid-base derangement.
Acetone Gas Sensing Properties of NiO Particle-Decorated TeO<sub>2</sub> Nanorod Sensors
Park, Sunghoon,Sun, Gun-Joo,Kheel, Hyejoon,Choi, Seungbok,Lee, Chongmu American Scientific Publishers 2016 Journal of nanoscience and nanotechnology Vol.16 No.8
<P>TeO2 nanorods decorated with NiO nanoparticles were synthesized by the thermal evaporation of Te powder followed by solvothermal deposition of NiO and their acetone gas sensing properties were examined. The pristine and NiO-decorated TeO2 nanorods exhibited responses of similar to 262% and similar to 601%, respectively, to 500 ppm acetone at 125 degrees C. The pristine and NiO-decorated TeO2 nanorod sensors showed the strongest response to acetone gas at 150 degrees C and 125 degrees C, respectively. The NiO-decorated TeO2 nanorod sensor showed selectivity to acetone gas over other volatile organic gases such as methane, toluene, benzene, and LPG at 125 degrees C. The underlying mechanism for the enhanced response of the NiO-decorated TeO2 nanorod sensor to acetone gas is discussed.</P>