초음파 센서를 이용한 차량 주차공간 탐색에서의 연석 감지 알고리즘

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.

Genomic Surveillance of SARS-CoV-2: Distribution of Clades in the Republic of Korea in 2020

Park Ae Kyung,Kim Il-Hwan,Kim Jun-Young,Kim Jeong-Min,Kim Heui Man,Lee Chae young,Han Myung-Guk,이기은,Kwon Donghyok,Nam Jeong-Gu,Park Young Joon,Gwack Jin,Lee Nam-Joo,Woo SangHee,No Jin Sun,Lee Jaehee,H 질병관리본부 2021 Osong Public Health and Research Persptectives Vol.12 No.1

Since a novel beta-coronavirus, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was first reported in December 2019, there has been a rapid global spread of the virus. Genomic surveillance was conducted on samples isolated from infected individuals to monitor the spread of genetic variants of SARS-CoV-2 in Korea. The Korea Disease Control and Prevention Agency performed whole genome sequencing of SARS-CoV-2 in Korea for 1 year (January 2020 to January 2021). A total of 2,488 SARS-CoV-2 cases were sequenced (including 648 cases from abroad). Initially, the prevalent clades of SARS-CoV-2 were the S and V clades, however, by March 2020, GH clade was the most dominant. Only international travelers were identified as having G or GR clades, and since the first variant 501Y.V1 was identified (from a traveler from the United Kingdom on December 22nd, 2020), a total of 27 variants of 501Y.V1, 501Y.V2, and 484K.V2 have been classified (as of January 25th, 2021). The results in this study indicated that quarantining of travelers entering Korea successfully prevented dissemination of the SARS-CoV-2 variants in Korea.

Clinical impact of pleural fluid carcinoembryonic antigen on therapeutic strategy and efficacy in lung adenocarcinoma patients with malignant pleural effusion

( Jaehee Lee ),( Deok Heon Lee ),( Ji Eun Park ),( Yong Hoon Lee ),( Sun Ha Choi ),( Hyewon Seo ),( Seung Soo Yoo ),( Shin Yup Lee ),( Seung-ick Cha ),( Jae Yong Park ),( Chang Ho Kim ) 대한내과학회 2024 The Korean Journal of Internal Medicine Vol.39 No.2

Background/Aims: Epidermal growth factor receptor (EGFR) mutation is important in determining the treatment strategy for advanced lung cancer patients with malignant pleural effusion (MPE). Contrary to serum carcinoembryonic antigen (S-CEA) levels, the associations between pleural fluid CEA (PF-CEA) levels and EGFR mutation status as well as between PF-CEA levels and treatment efficacy have rarely been investigated in lung adenocarcinoma patients with MPE. Methods: This retrospective study enrolled lung adenocarcinoma patients with MPE and available PF-CEA levels and EGFR mutation results. The patients were categorized based on PF-CEA levels: < 10 ng/mL, 10-100 ng/mL, 100-500 ng/mL, and ≥ 500 ng/mL. The association between PF-CEA levels and EGFR mutation status as well as their therapeutic impact on overall survival was compared among the four groups. Results: This study included 188 patients. PF-CEA level was found to be an independent predictor of EGFR mutation but not S-CEA level. The EGFR mutation rates were higher as the PF-CEA levels increased, regardless of cytology results or sample types. Among EGFR-mutant lung adenocarcinoma patients receiving EGFR-tyrosine kinase inhibitor (TKI) treatment, those with high PF-CEA levels had significantly better survival outcomes than those with low PF-CEA levels. Conclusion: High PF-CEA levels were associated with high EGFR mutation rate and may lead to a favorable clinical outcome of EGFR-TKI treatment in EGFR-mutant lung adenocarcinoma patients with MPE. These findings highlight the importance of actively investigating EGFR mutation detection in patients with suspected MPE and elevated PF-CEA levels despite negative cytology results.

Plastic optical fiber sensor based on in-fiber microholes for level measurement

Park, Jaehee,Park, Young June,Shin, Jong-Dug IOP Publishing 2015 Japanese journal of applied physics Vol.54 No.2

Prognostic Implication of Volumetric Quantitative CT Analysis in Patients with COVID-19: A Multicenter Study in Daegu, Korea

Park Byunggeon,Park Jongmin,Lim Jae-Kwang,Shin Kyung Min,Lee Jaehee,Seo Hyewon,Lee Yong Hoon,Heo Jun,Lee Won Kee,Kim Jin Young,Kim Ki Beom,Moon Sungjun,Choi Sooyoung 대한영상의학회 2020 Korean Journal of Radiology Vol.21 No.11

Objective: Lung segmentation using volumetric quantitative computed tomography (CT) analysis may help predict outcomes of patients with coronavirus disease (COVID-19). The aim of this study was to investigate the relationship between CT volumetric quantitative analysis and prognosis in patients with COVID-19. Materials and Methods: CT images from patients diagnosed with COVID-19 from February 18 to April 15, 2020 were retrospectively analyzed. CT with a negative finding, failure of quantitative analysis, or poor image quality was excluded. CT volumetric quantitative analysis was performed by automated volumetric methods. Patients were stratified into two risk groups according to CURB-65: mild (score of 0–1) and severe (2–5) pneumonia. Outcomes were evaluated according to the critical event-free survival (CEFS). The critical events were defined as mechanical ventilator care, ICU admission, or death. Multivariable Cox proportional hazards analyses were used to evaluate the relationship between the variables and prognosis. Results: Eighty-two patients (mean age, 63.1 ± 14.5 years; 42 females) were included. In the total cohort, male sex (hazard ratio [HR], 9.264; 95% confidence interval [CI], 2.021–42.457; p = 0.004), C-reactive protein (CRP) (HR, 1.080 per mg/dL; 95% CI, 1.010–1.156; p = 0.025), and COVID-affected lung proportion (CALP) (HR, 1.067 per percentage; 95% CI, 1.033– 1.101; p < 0.001) were significantly associated with CEFS. CRP (HR, 1.164 per mg/dL; 95% CI, 1.006–1.347; p = 0.041) was independently associated with CEFS in the mild pneumonia group (n = 54). Normally aerated lung proportion (NALP) (HR, 0.872 per percentage; 95% CI, 0.794–0.957; p = 0.004) and NALP volume (NALPV) (HR, 1.002 per mL; 95% CI, 1.000–1.004; p = 0.019) were associated with a lower risk of critical events in the severe pneumonia group (n = 28). Conclusion: CRP in the mild pneumonia group; NALP and NALPV in the severe pneumonia group; and sex, CRP, and CALP in the total cohort were independently associated with CEFS in patients with COVID-19.

How Followers and Leaders can Make a Difference:

Jaehee Park 한국인사행정학회 2017 한국인사행정학회보 Vol.16 No.2

Recent leadership studies point to the importance of taking followership into account when assessing leadership effectiveness. Accordingly, we develop and test a theoretical framework in which to examine the moderating role of participative versus directive leadership in the relationship between followership behaviors and job satisfaction. Focusing on data drawn from the 2012 Federal Employee Viewpoint Survey (FEVS), the study finds strong evidence that the effects of followership behaviors on job satisfaction were contingent on leadership styles. More importantly, the results showed that followers who actively engage in their work and demonstrate a high level of independent critical thinking derived greater job satisfaction where participative leadership was higher. By contrast, the role of participative leadership may be perceived as less effective when knowledge sharing and cooperation among employees already exists. This study offers insights into how leaders should interact with followers, and identifies the situations in which a particular leadership style can have positive consequences for employee job satisfaction.

지방자치단체 소방거버넌스 강화 요인들의 상대적 중요도 분석

Jaehee Park,Chang Mook Han 위기관리 이론과 실천 2021 Crisisonomy Vol.17 No.4

본 연구의 목적은 소방 거버넌스 강화를 위한 정책과제들의 우선순위를 제시하는 것이다. 소방 거버넌스를 ‘화재 예방 및 진압과 구조⋅구급 과정에서 의사결정 및 집행 등에 관한 활동’이라고 정의할때, 이를 지방자치단체 현장 수준에서 운용하기 위해서는 정책 과제들의 우선순위가 논의되어야한다. 이를 위하여 중앙소방학교 소방령 지휘역량과정 수료생을 대상으로 AHP(Analytic Hierarchy Process)를 활용하여 설문조사를 실시하고 상대적 중요도를 분석하였다. 리더십, 전문성, 협력성, 신속성과 하위 구성요소들의 중요도 산출 결과를 종합해보면 리더십의 하위 구성요소인 통합지휘체계개선의 중요도가 가장 높게 나타났으며, 협력성의 하위 구성요소인 통합훈련 실시 및 계획안 마련, 신속성의 하위 구성요소인 대응장비 보강 및 대응매뉴얼 개선, 리더십의 하위 구성요소인 기관 간조정방안 마련 등의 상대적인 중요도가 높은 것으로 파악되었다. 분석 결과를 바탕으로 소방거버넌스를 강화하기 위한 전략과 연구의 한계점을 논의하였다. The purpose of this study is to suggest strategies to strengthen governance of local fire agencies. We conducted a survey on students who completed the fire-fighting command competency course at the National Fire Service Academy and analyzed the relative importance of policy tasks using the AHP(Analytic Hierarchy Process). The results show that establishing an integrated command system, which is a sub-component of leadership, was the most important factor. It was found that the importance of preparing a plan, reinforcing response equipments, improving response manuals, preparing inter-agency coordination plans, and establishing networks were highly important. In addition, training employees, setting common goals, holding regular meetings, and dispatching order systems should be continuously promoted to improve local fire governance system. Based on the results, we discuss strategies for strengthening local fire governance.

Distinct U-shape efficiency-versus-current curves in AlGaN-based deep-ultraviolet light-emitting diodes.

Park, Jun Hyuk,Lin, Guan-Bo,Kim, Dong Yeong,Lee, Jong Won,Cho, Jaehee,Kim, Jungsub,Lee, Jinsub,Kim, Yong-Il,Park, Youngsoo,Schubert, E Fred,Kim, Jong Kyu Optical Society of America 2015 Optics express Vol.23 No.12

<P>The efficiency of an AlGaN deep-ultraviolet light-emitting diode with peak emission wavelength of 285 nm is investigated as a function of current over a wide range of temperatures (110 K to 300 K). We find that the efficiency-versus-current curve exhibits unique and distinct features over the entire temperature range including three points of inflection. At low temperatures, the change in slope in the efficiency-versus-current curve is particularly pronounced producing a minimum in the efficiency after which the efficiency rises again. Furthermore, at high current density, the low-temperature efficiency exceeds the room-temperature efficiency. The feature-rich efficiency-versus-current curve is consistent with an enhancement in p-type conductivity by field-ionization of acceptors that occurs in the high-injection regime and is particularly pronounced at low temperatures. Differential conductivity measurements show a marked rise in the high-injection regime that is well correlated to the minimum point in the efficiency-versus-current curve.</P>

Leading the active followers in U.S. federal agencies: The moderating role of leadership styles

( Jaehee Park ) 한국행정학회 2016 한국행정학회 학술발표논문집 Vol.2016 No.-

Recent leadership studies point to the importance of taking followership into account when assessing leadership effectiveness. Accordingly, we develop and test a theoretical framework in which to examine the moderating role of participative versus directive leadership in the relationship between followership behaviors and job satisfaction. Focusing on data drawn from the 2012 Federal Employee Viewpoint Survey (FEVS), the study finds strong evidence that the effects of followership behaviors on work-attitudes were contingent on leadership styles. More importantly, and contrary to popular belief, the results showed that active followers derived greater job satisfaction where directive leadership was higher, while the effects of highly participative leadership were weaker and even reduced job satisfaction in several instances. This study offers insights into how leaders should interact with active followers, and identifies the situations in which a particular leadership style can have negative consequences for employee satisfaction.

Toward Cooperation beyond Conflict: Using Anti-administration strategies

Jaehee Park(박재희) 한국갈등학회 2019 한국갈등학회보 Vol.5 No.1