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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.
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.
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.
3 차원 하이드로젤 지지체 제작을 위한 고분자 몰드의 가공 특성에 대한 실험적 연구
이필호(Pil-Ho LEE),이상원(Sang Won LEE),김시현(Si Hyeon KIM),성종환(Jong Hwan SUNG),정하승(Haseung CHUNG) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
3-dimentional hydrogel scaffold has been proposed for the effective production of biomimetic intestinal villi to reduce ethic and cost problems caused by animal testing in the pharmaceutical development. This paper explores the experimental approach to develop a new technique based on laser machining and micro-drilling process to produce the plastic mold for the fabrication of 3-dmientional hydrogel scaffold. For the process optimization, both of the laser machining and micro-scale drilling experiments are conducted with varying experimental conditions and structural characterization of mold and intestinal villi were performed using SEM (scanning electron microscope) and OM (optical microscope) images. For the candidate materials poly-carbonate (PC) was tried. The experimental results show that intestinal villi can be fabricated by both laser and micro-drilling machining processes.