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한재성(Jaesung Han),박기정(Kijung Park) 대한인간공학회 2019 大韓人間工學會誌 Vol.38 No.3
Objective: This study aims to develop a pedestrian safety assessment model for underground parking facilities that comprehensively measure the pedestrian safety level of an underground parking facility. Background: Although underground parking spaces have many potential risks that can cause pedestrian accidents, assessment frameworks that enable to comprehensively measure and monitor the risk levels of underground parking facilities have not been widely discussed in the literature. In this regard, it is necessary to develop a safety assessment framework that can objectively and quantitatively capture the safety level in an underground parking facility. Method: 381 indicators that are associated with general pedestrian safety were extracted from the extant literature first. Then, these indicators were streamlined and standardized based on the importance of each indicator. Finally, a total of ten identified major indicators with sub-indicators and three safety factors categorizing these indicators were derived as a basis of a safety assessment framework. A weighted average scoring system using Analytic Hierarchy Process (AHP) was employed for the indicators measured in a Likert scale and their associated factors to quantify the overall safety level. The proposed framework was applied to a case study of a Korean university. Results: The results showed the overall safety level of the undergraduate parking facility at the university is in a range of "requiring minor treatment". However, the visibility factor had a low safety score, which requires immediate treatment. Based on the assessment results, a sensor system was proposed to improve the safety score of visibility. Conclusion: This study proposed an assessment framework that can objectively measure the safety level of an undergraduate parking space based on multi-criteria for pedestrian safety. The proposed framework can be a useful basis to continuously monitor the progress of underground-parking safety. Application: The proposed framework can be applied to any type of undergroundparking spaces.
Park, Joo Young,Park, Sanghoo,Choe, Wonho,Yong, Hae In,Jo, Cheorun,Kim, Kijung American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.50
<P>Deadly diseases caused by pathogenic bacteria and viruses have increasingly victimized humans; thus, the importance of disinfection has increased in medical settings as well as in food and agricultural industries. Plasma contains multiple bactericidal agents, including reactive species, charged particles, and photons, which can have synergistic effects. In particular, the chemicals formed in aqueous solution during plasma exposure have the potential for high antibacterial activity against various bacterial infections. Here, we report the antibiotic potency of plasma-treated water (PTW). To illustrate the applicability of PTW for disinfecting biological substances, an Escherichia coli biofilm was used. We sought to identify the chemical species in PTW and investigate their separate effects on biofilm removal. Dielectric barrier discharge in ambient air was used to prepare the PTW and treat the biofilm directly. Hydrogen peroxide, ozone, and nitrites were identified as the long-lived reactive species in the PTW, whereas hydroxyl radicals and superoxide anions were identified as the short-lived reactive species in the PTW; all these species showed an ability to disinfect in biofilm removal.</P>
하천 제외지 및 댐 홍수조절지 등에 대한 비점오염원 관리방안 연구
박기중 ( Kijung Park ),구혜진 ( Hyejin Ku ),정제호 ( Jeho Jung ),류덕희 ( Deughee Rhew ) 한국농공학회 2009 한국농공학회 학술대회초록집 Vol.2009 No.-
최근 하천 제외지 및 댐 홍수조절지 내 비점오염원의 주변 수계에 미치는 잠재적 위해성에 대한 사회적 관심이 고조됨에 따라 환경부에서는 환경기초조사사업의 일환으로 4 대강 수계에 대하여 경작지 및 오염원 투입현황에 대한 실태조사를 수행하고 있다. 반면, 하천 제외지 및 댐 홍수조절지 내 비점오염원에서의 배출 특성은 일반 경작지와 다르며, 계절별ㆍ호우사상별ㆍ물관리 방법별 변동성으로 인하여 물질 투입량, 작물 소모량, 토양 잔류량, 자연 감소량, 유출 및 용출 물질량 등의 정량화가 매우 어려워 수계별 일부 관심지역에 대해서 기초적인 조사만이 현재 이루어지고 있다. 또한, 국내ㆍ외 관련 연구 부족은 물론 경작지 및 오염물질 투입 현황에 대한 실태 파악 등의 기초적인 데이터베이스조차 구축되지 않은 실정이다. 따라서 합리적이며 체계적인 비점오염원의 관리, 오염총량관리제도 지원, 수생태계 보호를 위한 대안 마련 및 정책 수립을 위해서는 하천 제외지 및 댐 홍수조절지 내 경작지 현황 및 오염물질 투입 현황에 대한 실태조사는 선행되어야 할 것으로 판단된다. 연구의 내용 및 범위는 크게 첫째, 지적도, 하천 경계망도, 호소·저수지 경계망도 자료를 수집하여 GIS tool을 이용, 경작지 현황에 대한 데이터베이스를 구축하였으며 둘째, 농림수산식품부 및 농협 등 관계기관 통계자료 등을 이용하여 지역별, 토지이용별 하천 제외지 및 댐 홍수조절지 내 경작지에서의 오염물질 투입현황을 조사하는데 있다. 본 연구를 통하여 우리나라 전수계를 대상으로 하여 하천 제외지 및 댐 홍수조절지 내 경작지 현황과 오염물질 투입현황을 파악하고 지리정보시스템과 연계하여 데이터베이스를 구축함으로서 하천 제외지 및 댐 홍수조절지의 합리적인 활용방안과 효율적인 비점오염원 관리를 위한 대안 마련시 기초자료로 활용하고자 한다.
자율주행 기록장치(DSSAD) 장착을 대비한 교통사고 조사방법 연구
박기정(Kijung Park),양정훈(Jeonghun Yang),천정환(Jeonghwan Cheon) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
In the era of automated driving vehicles, it is necessary to prepare for the installation of DSSAD in traffic accident analysis. In this study, Real vehicle experiments about the operation of the Lane Keeping Assist System (LKAS) and Automated Emergency Braking System(AEBS) function are carried out by condition. According to the driving experiment, the AEBS function is not operated when the camera and radar are covered, and LKAS function is not operated if the lane is drawn in a zigzag shape. This experiment shows the characteristics of AEBS and LKAS, which are key technologies for automated driving. In order to prepare for the installation of DSSAD, If additional researches on malfunctions and limitations such as Adaptive Cruise Control(ASCC) and Smart Rear Crash Prevention Assistance (SBSD) are carried out, its use will be maximized in the automated driving vehicles accident analysis field.
Photo-stimulated resistive switching of ZnO nanorods
Park, Jinjoo,Lee, Seunghyup,Yong, Kijung IOP Pub 2012 Nanotechnology Vol.23 No.38
<P>Resistive switching memory devices are promising candidates for emerging memory technologies because they yield outstanding device performance. Storage mechanisms for achieving high-density memory applications have been developed; however, so far many of them exhibit typical resistive switching behavior from the limited controlling conditions. In this study, we introduce photons as an unconventional stimulus for activating resistive switching behaviors. First, we compare the resistive switching behavior in light and dark conditions to describe how resistive switching memories can benefit from photons. Second, we drive the switching of resistance not by the electrical stimulus but only by the modulation of photon. ZnO nanorods were employed as a model system to demonstrate photo-stimulated resistive switching in high-surface-area nanomaterials, in which photo-driven surface states strongly affect their photoconductivity and resistance states. </P>
ZnO Nanowire Based Photoelectrical Resistive Switches for Flexible Memory
Park, Jinjoo,Song, Hongseon,Lee, Eun Kwang,Oh, Joon Hak,Yong, Kijung The Electrochemical Society 2015 Journal of the Electrochemical Society Vol.162 No.9
<P>In this work, a non-volatile resistive optoelectronic memory was demonstrated in a flexible system that plays the dual roles of a reversible photo-reactive element and a signal-collecting element. We attempted to demonstrate the tactile sensor by detecting the rotation angle and bending angle of the wearable information appliance worn by the user. This motion-sensing for certain critical angle and information-storing functionality is enabled by photo-tunable resistive switching behaviors, which results from bending the flexible device in diverse convex angles with respect to the incident light direction. Furthermore, we investigated the basic mechanism of resistive photoelectrical switching behaviors by studying the effects of electrostatic barrier at the Au/ZnO junction, e.g., a Schottky barrier depending on the photonic and electric condition. Moreover, by employing a polymer structure, application in a prototype device provided improved endurance or retention of data.</P>
김기정(KiJung Kim),황희정(Heejeong Hwang),장호(Ho Jang),김성진(SeongJin Kim),박흥식(HongSik Park) 한국트라이볼로지학회 2008 한국윤활학회지(윤활학회지) Vol.24 No.4
Tribological properties of ceramic brake discs were investigated using a commercial friction material. The discs were manufactured by liquid silicon infiltration (LSI) into a C-C preform. The disc surface was modified by two different methods, producing sliding surfaces with chopped carbon fibers and carbon felt. In addition, the composition of the surface was also changed. Friction characteristics of the discs were examined using a 1/5 scale dynamometer. Results showed that the type and composition of the disc surface significantly affected the level of braking effectiveness and high temperature brake performance. The discs with felt surfaces showed higher friction levels than those with chopped fiber surfaces and SiC tended to increase the friction level while C lowered the friction coefficient. The ceramic disc was more sensitive to the deceleration rate than gray iron, showing high speed sensitivity.