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.

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.

Laboratory and radiological discrimination between tuberculous and malignant pleural effusions with high adenosine deaminase levels

( Jaehee Lee ),( Ji Eun Park ),( Sun Ha Choi ),( Hyewon Seo ),( Sang Yub Lee ),( Jae Kwang Lim ),( Seung Soo Yoo ),( Shin Yup Lee ),( Seung Ick Cha ),( Jae Yong Park ),( Chang Ho Kim ) 대한내과학회 2022 The Korean Journal of Internal Medicine Vol.37 No.1

Background/Aims: Pleural fluid adenosine deaminase (ADA) levels are useful in discriminating tuberculous pleural effusions (TPEs) from malignant pleural effusions (MPEs). However, some patients with MPE exhibit high-ADA levels, which may mimic TPEs. There is limited data regarding the differential diagnosis between high-ADA MPE and high-ADA TPE. This study aimed to identify the predictors for distinguishing high-ADA MPEs from high-ADA TPEs. Methods: Patients with TPE and MPE with pleural fluid ADA levels ≥ 40 IU/L were included in this study. Clinical, laboratory, and radiological data were compared between the two groups. Independent predictors and their diagnostic performance for high-ADA MPEs were evaluated using multivariate logistic regression analysis and receiver operating characteristic curve. Results: A total of 200 patients (high-ADA MPE, n = 30, and high-ADA TPE, n = 170) were retrospectively included. In the multivariate analysis, pleural fluid ADA, pleural fluid carcinoembryonic antigen (CEA), and pleural nodularity were independent discriminators between high-ADA MPE and high-ADA TPE groups. Using pleural ADA level of 40 to 56 IU/L (3 points), pleural CEA level ≥ 6 ng/mL (6 points), and presence of pleural nodularity (3 points) for predicting high-ADA MPEs, a sum score ≥ 6 points yielded a sensitivity of 90%, specificity of 96%, positive predictive value of 82%, negative predictive value of 98%, and area under the receiver operating characteristic curve of 0.965. Conclusions: A scoring system using three parameters may be helpful in guiding the differential diagnosis between high- ADA MPEs and high-ADA TPEs.

자율 주행 차량의 사고 예방을 위한 통합 알림 시스템 제안-운전자 부주의로 인한 사고를 중심으로-

Jaehee Park,Jeongyun Heo 한국서비스디자인학회 2023 한국서비스디자인학회 학술대회자료집 Vol.2023 No.1

최근 자율주행 차량 운전자들의 '부주의 행동'으로 인한 사고가 지속적으로 발생하고 있으며, 다 양한 관점에서 이에 대한 연구가 수행되고 있다. 본 연구는 운전자의 부주의로 인해 발생하는 자율주 행 차량 사고 상황을 사용자의 관점에서 분석하고, 사고를 예방할 수 있는 시스템을 제안한다. 사고의 요인이 발생하는 위치(차량 내부/외부)를 기준으로 사고 상황을 [Case 1, 2]로 분류하였으며, 사용자 의 인지와 행동 단위로 상황을 분석해 각 단계에 맞는 사고 예방 시스템을 구성하고 시스템에 활용되 는 청각알림의 분류를 제안하였다. 본 연구는 운전자의 인지과정을 중심으로 자율주행 차량의 사고를 분석하고 빠른 인지-행동 수행을 위한 청각 알림 시스템을 제안하였다는데 의의가 있다. Recently, accidents caused by 'inattentive behavior' of autonomous vehicle drivers have been occurring continuously, and studies have been conducted from various perspectives. This study analyzes the situation of autonomous vehicle accidents caused by driver inattention from the user's perspective and proposes a system that can prevent accidents. We classified the accident situation into [Case 1, 2] based on the location where the factors of the accident occur (inside/outside the vehicle), and analyzed the situation in units of user's perception and behavior to construct an accident prevention system for each stage, and proposed a classification of auditory notifications used in the system. The significance of this study is that it analyzed the accident of autonomous vehicles centered on the driver's cognitive process and proposed an auditory notification system for quick cognition and action.

Interfacial thermal resistance theory and experimental proof considering contribution of energy transfer and size effect of electrons and phonons at nanoscale.

JaeHee Park(박재희),Kyeongtae Kim(김경태) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12

Optical time domain reflectometer for intrusion detection

Jaehee Park,Ilmin Kim 대한전자공학회 1997 대한전자공학회 학술대회 Vol.1997 No.6

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.

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.

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

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>