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      • KCI등재

        항만과 주변도시지역의 연계성 강화를 위한 사례연구 - 항만도시 인터페이스 공간 개념을 중심으로 -

        정재용,김정훈 대한건축학회지회연합회 2020 대한건축학회연합논문집 Vol.22 No.6

        Port cities gradually declined as the existing port functions became obsolete and idle amid the rapidly changing urban development process. Accordingly, much effort was made to revitalize the port area and the old city center adjacent to it. However, redevelopment, which lacked the connection between the old city center and the all-round development method, resulted in a disconnection between the port and the old city center. Therefore, the purpose of this study is to suggest a direction for mutually complementary growth of port space and urban space. To this end, a space that can act as a buffer between a port and an urban space, that is, the 'Port City Interface', is analyzed for the urban spatial aspect (Accessibility and Publicness) and the programmatic aspect (Sense of Place and commerciality) through character analysis of the "Port City Interface" that can serve as a buffer between the port and urban space. Based on this, problems and implications were derived through analysis of domestic cases (Inner Port of Gunsan Port, Inner Port of Incheon, North Port of Busan) and overseas cases (Liverpool of UK, Bilbao of Spain, HafenCity of Germany) selected as the study sites.

      • 2P-664: The Effect of Potassium Hydroxide (KOH) Chemical Activation and CO<sub>2</sub> Doping in Carbon Felt Electrodes of Vanadium Redox Flow Battery (VRFB)

        정재용,김성윤,김선회,정지영,이은숙 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1

        Redox Flow Battery (RFB) is one of the strong candidates for energy storage system (ESS). VRFB system uses VOSO<sub>4</sub> / V<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> for positive and negative electrolyte, respectively. In the study, the carbon felts were treated with various concentrations of KOH, followed by CO<sub>2</sub> doping to improve the hydrophilicity. Also CO<sub>2</sub> doping change the hydrophobicity to hydrophilic of the carbon felt. Cycle voltammetry (CV) and unit cell test were conducted performance of carbon felts as electrode. Scanning Electron Microscope (SEM) shows how to change the surface morphologies of carbon felt. <sup>**</sup>본 연구는 중소기업청에서 지원하는 “2014년도 산학연협력 기술개발사업(No. S2169246 )”의 연구수행으로 인한 결과물임을 밝힙니다.

      • KCI등재

        Quantitative Evaluation of Patient-Specific Quality Assurance Using Online Dosimetry System

        정재용,신영주,손승창,민정환,김연래,김동수,최보영,서태석 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.72 No.2

        In this study, we investigated the clinical performance of an online dosimetry system (Mobius FX system, MFX) by 1) dosimetric plan verification using gamma passing rates and dose volume metrics and 2) error-detection capability evaluation by deliberately introduced machine error. Eighteen volumetric modulated arc therapy (VMAT) plans were studied. To evaluate the clinical performance of the MFX, we used gamma analysis and dose volume histogram (DVH) analysis. In addition, to evaluate the error-detection capability, we used gamma analysis and DVH analysis utilizing three types of deliberately introduced errors (Type 1: gantry angle-independent multi-leaf collimator (MLC) error, Type 2: gantry angle-dependent MLC error, and Type 3: gantry angle error). A dosimetric verification comparison of physical dosimetry system (Delt4PT) and online dosimetry system (MFX), gamma passing rates of the two dosimetry systems showed very good agreement with treatment planning system (TPS) calculation. For the average dose difference between the TPS calculation and the MFX measurement, most of the dose metrics showed good agreement within a tolerance of 3%. For the error-detection comparison of Delta4PT and MFX, the gamma passing rates of the two dosimetry systems did not meet the 90% acceptance criterion with the magnitude of error exceeding 2 mm and 1.5, respectively, for error plans of Types 1, 2, and 3. For delivery with all error types, the average dose difference of PTV due to error magnitude showed good agreement between calculated TPS and measured MFX within 1%. Overall, the results of the online dosimetry system showed very good agreement with those of the physical dosimetry system. Our results suggest that a log file-based online dosimetry system is a very suitable verification tool for accurate and efficient clinical routines for patient-specific quality assurance (QA).

      • KCI등재후보

        울산항의 항행환경 조사.분석

        정재용,김철승,박영수,정기남,Jeong, Jae-Yong,Kim, Cheol-Seung,Park, Young-Soo,Jeong, Ki-Nam 해양환경안전학회 2008 海洋環境安全學會誌 Vol.14 No.3

        이 논문은 해양사고가 발생하는 원인을 파악하기 위해 자연환경, 지형 여건, 해양사고, 해상교통 및 해상교통류 등을 조사 분석하고, 전문가조사 및 이용자에 대한 설문조사를 실시하다. 그 결과 다음과 같은 결과를 얻었다. 첫째, 정박지인 E-1, 2, 3 정박지에서 정박 중인 선박이 주묘가 되는 경우가 빈번하다. 둘째, 정박지가 부족하며, 부두가 항로의 지근거리에 위치하고 있다. 그리고 항로 폭이 협소하고, 원유선 계류부이가 항로에 인접하여 위치하고 있어 여러 수역에서 해상교통흐름이 교차하고 있다. 셋째, 해양사고는 제1항로와 소형선박 정박지(M1-M7) 및 돌핀부두 인접수역, 간절곶 인접수역, E 정박지, 항로 진출입 인접수역에서 발생하고 있다. 넷째, 해상교통흐름은 항내 이동선박이 많고, 위험화물 운송선박의 비율이 높다. 그리고 예부선 등 소형선이 무질서하게 항내를 이동하고, 항로가 서로 교차하고 있다. 다섯째, 이용자 및 전문가에 대한 설문조사는 항로 진입부를 식별할 수 있는 대형등부표가 필요하다. Natural environment, topographical conditions and marine traffic flows were investigated and questionnaire surveys were performed for the purpose of understanding the cause of marine accidents. The frequent cases of ships' dragging have happened at the anchorages of E-1, E-2 and E-3. The anchorage area is insufficient for the accommodation of a number of ships, the dolphins at the nearby piers are located near a narrow fairway. SBMs' are positioned too close to the fairway. It shows that many crossing marine traffic flows occur in all areas of the port. Marine casualties are concentrated mainly at No. 1 fairway, M1-M7 waters close to the dolphins and Gwanjeolgot, "E" anchorage and the waters close to the fairway "come and go" areas. The marine traffic flow is mainly caused by the ships' movement at the inter-port and most of the ships are the dangerous cargo carriers. And small ships like the tug-barge are moving disorderly in the ports. Furthermore, the fairway‘s layout is crossing each other. Questionnaire surveys of the users and experts shows that the LANBY that can distinguish the fairway of "come and go" ports is required.

      • KCI등재

        선박교통관리제도의 비용편익분석모델에 관한 연구(II)

        정재용,박진수 해양환경안전학회 2001 海洋環境安全學會誌 Vol.7 No.3

        The introduction of coastal vessel traffic services enables vessels in coastal waters to navigate in safety or to get her position with ease and prevents the vessel from becoming cause of casualties. But it needs relatively huge amount of cost to construct and operate and maintain. Thus we must be checked with economical adequacy of the the proposed coastal vessel traffic services by comparing the cost of the construction, operation and maintenance with the expected benefit made by the expected decrease in marine casualties. In previous paper, a proper cost-benefit analysis model for the Korean practice will be suggested. In this Paper, the proposed the cost-benefit analysis model of coastal vessel traffic services was applied to the Koje coastal waters 20mi1es from the top of Maemul-Do and Yokchi-Do. As the result, we confirmed the propriety of the cost-benefit analysis with the application of the proposed model to Koje waters. Also, it is verified that the introduction of coastal vessel traffic services, as proposed, is adequate and economical. The cost-benefit analysis model proposed in this study could be used to investigate the economic Propriety of new aids to navigation and traffic safety facilities in the future.

      • KCI등재

        Digital Videoscopic Retrograde Intrarenal Surgeries for Renal Stones: Time-to-Maximal Stone Length Ratio Analysis

        정재용,김종찬,강동혁,이주용 연세대학교의과대학 2018 Yonsei medical journal Vol.59 No.2

        Purpose: To investigate 100 consecutive cases of videoscopic retrograde intrarenal surgery (RIRS) by a single surgeon and to evaluatefactors associated with stone-free status and the learning curve thereof. Materials and Methods: We analyzed the results of videoscopic RIRS in 100 patients who underwent primary treatment for renal stones from January 2015 to August 2016. Videoscopic RIRS were performed with URF-V and URF-V2 flexible video uteroscopes (Olympus) or a Flex-Xc flexible ureterorenoscope (KARL STORZ). Non-contrast computed tomography was taken at 3 months postoperativelyto confirm the absence of stones. The stone characteristics included the location, maximal stone length (MSL), stone heterogeneity index (SHI), and mean stone density (MSD). Fragmentation efficacy was calculated as operative time (min) dividedby removed MSL (mm), and was evaluated in the sequential order of operations. Results: The mean age of the total patient was 60.0±14.0 years. The mean MSL was 13.1±6.2 mm. The average MSD was 734.2±327.6 Hounsfield unit (HU) and the SHI was 241.0±120.0 HU. The mean operation time was 65.1±45.7 min considering each renal unit. The stone-free rate at 3 months post-surgery was 87%. The estimated cut-off of the time-to-MSL ratio below 5 min/mm was 50. Multivariate analyses indicated a lower MSD [odds ratio (OR): 0.998; 95% confidence interval (CI): 0.996− 0.999; p=0.047) and the last 50 cases (OR: 5.408, 95% CI: 1.337−30.426; p=0.030) as independent predictors of stone-free status after videoscopicRIRS. Conclusion: Low MSDs and the last 50 cases were significant predictors of stone-free rate in videoscopic RIRS.

      • KCI등재

        광섬유의 선형복굴절 보상에 따른 170 kV GIS용 전류 센서의 출력 특성

        정재용,김병태 대한전기학회 2005 전기학회논문지C Vol.54 No.2(C)

        The optical CT was developed to use twisted fibers for 170 kV GIS. The fiber sensor optimized on the optical CT was wound 3 turns and twisted 4 times per a turn at the pipe with a diameter of 130 mm. The measurement error for the linearity which was satisfied the criterion of 'IEC Class-1.0' was less than 0.44 % at the transmission type and 0.82 % at the reflection type to 2,000 A. At a low current to 200 A, the measurement error was 0.69% at the transmission type and 1.38 % at the reflection type.

      • KCI등재

        울산항 접근수역의 항로지정에 관한 연구

        정재용,윤대근,김철승 해양환경안전학회 2010 海洋環境安全學會誌 Vol.16 No.2

        본 연구에서는 울산항 인근해역에 대한 자연환경, 해양사고, 해상교통량 및 해상교통흐름 관측, 어업현황 등을 조사 분석하고, 전문가 및 이용자에 대한 설문조사를 실시하여 개선안을 도출하였다. 본 연구는 전문가 및 사용자의 설문조사 실행을 통한 항해위험 필수요소, 개선계획 및 충돌위험 필수요소를 제시하였다. 본 연구의 결과로서 보다 효율적인 항로를 도출하였다. This study examined environmental condition, marine accidental data, marine traffic capacity and traffic flow, and fisheries zone status near Ulsan approaching water area. A questionnaire survey of marine traffic system was conducted on experts and users, and new plan was proposed. On the basis of the responses of experts and users to questionnaire, the essential factor of navigation danger and the essential factor of collision risk as well as the improvement plans were proposed. More efficient navigational fairway was set up through this study.

      • 광섬유의 선형복굴절 보상에 따른 170 kV GIS용 전류 센서의 출력 특성

        정재용,김병태,Jeong Jae-Yong,Kim Byung-Tai 대한전기학회 2005 전기학회논문지C Vol.54 No.2

        The optical CT was developed to use twisted fibers for 170 kV GIS. The fiber sensor optimized on the optical CT was wound 3 turns and twisted 4 times per a turn at the pipe with a diameter of 130 mm. The measurement error for the linearity which was satisfied the criterion of 'IEC Class-1.0' was less than ± 0.44 % at the transmission type and ± 0.82 % at the reflection type to 2,000 A. At a low current to 200 A, the measurement error was ± 0.69% at the transmission type and ± 1.38 % at the reflection type.

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