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컨테이너 터미널의 사물인터넷(IoT) 적용가능성에 관한 연구
전상현(Jeon, Sang-Hyeon),강달원(Kang, Dal-Won),민세홍(Min Se-Hong),김시현(Kim Si-Hyun) 한국항만경제학회 2020 韓國港灣經濟學會誌 Vol.36 No.2
IoT는 다양한 산업에서 적용되고 있으며, 전 세계적으로 IT산업을 이끌어갈 미래기술로 주목 받고있다. 스마트 도시를 필두로 공공서비스 분야, 의료 산업 분야, 자동차 산업 분야 등이 대표적이다. IT기술을 기반으로 발전하고 있는 물류산업에도 큰 영향을 미칠 것으로 예상되지만 컨테이너 터미널에서의 IoT기술의 도입은 제한적으로 발전하고 있으며, 기존 선행연구를 검토한 결과 컨테이너 터미널을 대상으로 IoT 기술의 적용에 관한 연구는 미비한 실정이다. 본 연구에서는 컨테이너 터미널에 IoT 적용가능성을 ANP 분석을 통하여 실질적으로 IoT의 적용가능분야 및 방안을 도출하기 위해 ANP 분석을 실시하였으며, 분석결과 컨테이너 터미널에서의 IoT 적용분야는 운영시스템(26.7%), 안전/환경/보안시스템(26.4%), 장비/정비시스템(25.3%), 시설유지/보수시스템(21.6%)순으로 분석되었다. IoT기술은 컨테이너 터미널에서 특정 분야에 집중되는 기술이 아니기 때문에 컨테이너 터미널에 IoT기술의 적용 시 적용분야나 평가기준의 중요도도 중요하지만 거시적 관점에서의 컨테이너 터미널 구성요소에 적용할 때 각 시스템간의 연계성 측면이나 효율성 측면을 고려해서 전사적인 시스템 구축하는 것이 더욱 바람직한 것으로 판단된다. The Internet of things (IoT) has been applied to a variety of industrial uses such as public service sectors, medical industries, automotive industries, and so on. Led by smart cities, this is typical. However, from a logistics perspective, the level of application is insufficient. This study examines the applicability of IoT-related technology in a container terminal, an object of the present invention, to derive an applicable plan. Analytic network process (ANP) analysis reveals the following results for IoT applications in container terminals: operating systems (26.7%), safety/environmental/security systems (26.4%), equipment maintenance systems (25.3%), and facility maintenance systems (21.6 %). The second ANP analysis reveals the following results: Economy (40.2%), productivity (21.1%), service level (19.5%), and utilizing technology level (19.2%). The application or standard of evaluation is important when applying IoT technology to container terminals; however, it is not concentrated in a certain area. It is desirable to build each container system with linkage and efficiency from a macroscopic view.
Agitating Mixer System 을 이용한 고농도 페수처리의 동력학적 해석
이상수(Sang Soo Lee),김시현(Si Hyeon Kim),정근진(Kun Jin Jung) 한국물환경학회 2001 한국물환경학회지 Vol.17 No.6
Biofilm reactors were numbered in terms of temperature, and biofilm reactor No.1 represented 25℃ and No.2 15℃. At 24hr of HRT, BOD removal efficiency was 94.7% at biofilm reactor No.1 and 92.3% at No.2, respectively, while it was about 90.0% for biofilm reactor No.1 and No.2 at 18hr of HRT. However, BOD removal efficiency was decreased below 12hr of HRT. At 25℃ the half saturation constant(K_s) and maximum specific substrate removal rate(k_(max)) were 228 ㎎/L and 0.96 day^(-1), respectively. In addition, the microbial yield coefficient(Y), decay coefficient(K_d), and maximum specific growth rate(μ_(max)) were 0.248 ㎎VSS/㎎BODre, 0.048 day^(-1), and 0.372 hr^(-1), respectively. On the other hand, at 15℃ the saturation constant (K-s) and maximum specific substrate removal rate(k-max) were 600 ㎎/L and 1.82 day^(-1). The microbial yield coefficient(Y), decay coefficient(K-d), and maximum specific growth rate were 0219 ㎎VSS/㎎ BODre, 0.045 day^(-1), and 0.487 hr^(-1), respectively.
정근진 ( Kun Jin Jung ),이상수 ( Sang Soo Lee ),김시현 ( Si Hyeon Kim ),박규홍 ( Kyoo Hong Park ) 한국물환경학회 2002 한국물환경학회지 Vol.18 No.2
Nitrogen, in its various forms, can deplete dissolved oxygen levels in receiving waters, stimulate aquatic growth, exhibit toxicity toward aquatic life and affect the suitability of sewage for reuse. Pilot-scale Rotating Biological Contactor(RBC) experiments were conducted to examine biological nitrification, respectively, of municipal sewage with five different internal recirculation ratios of 0, 1, 2, 3, and 4 using the constant hydraulic loading of 205 U/㎡·day. The use of internal recirculation improved nitrification on account of the dilution of biodegradable organic carbon in influent sewage down to 15mg/L of SBOD_5 or less. Ammonium nitrogen of 14.3±2.4 % was consumed by cellular assimilation without the occurrence of denitrification. The thickness of biofilm didn`t seem effect significantly the nitrification and denitrification. Nitrification with internal recirculation was found to occur using hydraulic loading rate of as high as 205L/㎡·day, which was beyond the generally known values of it.
소윤환 ( Yoon Hwan So ),강동환 ( Dong Hwan Kang ),김일규 ( Il Kyu Kim ),김병우 ( Byung Woo Kim ),윤환진 ( Hwan Jin Yoon ),김시현 ( Si Hyeon Kim ),손용석 ( Yong Seok Son ),신정현 ( Jung Hyeon Shin ),안정우 ( Jeong Woo Ahn ) 한국환경과학회 2017 한국환경과학회지 Vol.26 No.2
This study investigated the characteristics of variations in carbon dioxide concentration and air temperature with the vertical change of surface in a grassplot. Field observations were carried out at a grassplot in Gyeongnam Science High School, over four days in August and November, 2015. Continuous observation equipment (GMP343, VAISALA) was installed at the LP (0.1 m from the surface) and UP (1.1 m from the surface) points, and the carbon dioxide concentration and air temperature were measured simultaneously at 1-min intervals. To summarize the results of the observation, August had higher than average concentrations of carbon dioxide, while November showed average air temperatures. Moreover, the concentration of carbon dioxide was higher at the UP point, while the air temperature was higher at the LP point. The correlation coefficient of carbon dioxide concentration between the UP and LP points was 0.80 in August across all the four days, while it was higher in November at 0.58 0.95. The results of the regression analysis of carbon dioxide concentration with air temperature changes for both August and November showed a distinct change at the LP point (R2=0.36 0.76), as compared to the UP point (R2=0.1 0.57). Between the UP and LP points, the carbon dioxide concentration and air temperature regression analysis results indicated that an active exchange was taking place between the two points.