• 멤브레인
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• 제18권1호
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• pp.35-43
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• 2008

본 연구를 통하여 나노입자를 분리막의 표면에 함침시킴으로써 MBR 공정상에서 가장 큰 문제인 막 오염 문제를 해결하고자 하였고 실제 제작된 분리막의 현장적용 테스트를 거쳐서 개발된 분리막의 막 오염 저항성질을 확인하였다. 실험과정은 본 연구를 통한 티타니아가 함침된 분리막 제품과 국외의 타사 제품과의 장시간 현장적용 테스트를 통해 본 연구 제품의 우수성을 확인할 수 있었다. 본 연구 제품은 활성슬러지의 농도가 $7,000{\sim}13,000mg/L$의 고농도인 조건에서 $20{\sim}25L/m^2{\cdot}hr$의 투과유량을 꾸준하게 유지하는 것을 확인할 수 있었다. 이와 아울러 막과 막사이의 배치거리, 막과 산기관의 배치거리, 산기관의 홀 크기, 세정액의 농도 및 처리 방법 등에 따른 분리막의 투과유량의 거동 등을 살펴보았다. 즉 이들 부수적인 변수들의 최적화를 통해 분리막의 물성을 극대화할 수 있는 방법을 모색해 보았다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 1998년도 제14회 학술발표회 논문개요집
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• pp.20-20
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• 1998

I Ion beam technology has recently attracted much interest because it has exciting t technological p아:ential for surface analysis, ion beam mixing, surface cleaning and etching i in thin film growth and semiconductor fabrication processes, etc. Es야~cially, ion beam s sputtering has been widely used for sputter depth profiling with x-photoelectron S spectroscopy (XPS) , Auger electron s$\pi$~troscopy(AES), and secondary-ion mass S야i따oscopy(SIMS). However, The problem of surface compositional ch없1ge due to ion b bombardment remains to be understo여 없ld solved. So far sputtering processes have been s studied by s따face an외ysis tools such as XPS, AES, and SIMS which use the sputtering p process again. It would be improbable to measure the modified surface composition profiles a accurately due to ion beam bombardment with surface analysis techniques based on sputter d depth profiling. However, recently Medium energy ion scattering spectroscopy(MEIS) has b been applied to study the sputtering of solid surface at ion bombardment and has been p proved that it has been extremely valuable in probing the surface composition 뻐d s structure nondestructively and quantita디vely with less than 1.0 nm depth resolution. To u understand the sputtering processes of solid surface at ion bombardment, The Molecular D Dynamics(MD) and Monte Carlo(MC) simulation has been used and give an intimate i insight into the sputtering processes of solid surfaces. In this presentation, the sputtering processes of alloys and compound samples at ion b bombardment will be reviewed and the MEIS results for the Ar+ sputter induced altered l layer of the TazOs thin film 뻐dd없nage profiling of Ar+ ion sputt얹"ed Si(100) surface will b be discussed with the results of MD and MC simulation.tion.

• Journal of Acupuncture Research
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• 제32권2호
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• pp.131-145
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• 2015

Objectives : The purpose of this study was to demonstrate the effectiveness and availability of salt pharmacopuncture of Korean sun-dried salt and processing salt on the basis of bibliographical review. Methods : This study was done through a narrative review of related bibliography including medical books, journals, general bibliography, and web sites. Results : 1. Korean sun-dried salt is produced in the ground with soil, tiles, and pottery. Sun-dried, traditional, granulated, bamboo, and grilled salts are all appropriate for medical use. They are composed of a lower level of NaCl and unnecessary substances, and have a higher water and mineral content. 2. The 9~30 g of NaCl included in the physiological saline matches the ratio of a normal human body. However, if the saline is used for water supply, it should be improved because the recommended amount is much lower. 3. Medicine that includes NaCl is applied for lessening the congestion of the nasal cavity, alleviating cornea swelling, or for a lack of water. NaCl can also be used for washing contact lenses as well as cleaning the mucous membrane of the eyes and nose. 4. Salt relieves anger, detoxifies, induces vomiting, builds strong muscles and bones, gives energy, slows aging, and ultimately improves health. 5. Salt treats many diseases including: cardiovascular, hematosis, respirometer, obstetric, musculoskeletal, mineral supplement, eye, teeth and skin issues, etc.. However, salt is not used for treating asthma, cough, or other ailments mainly affecting the vascular system. 6. While NaCl in salt absorbs water and the vascular constriction results in higher blood pressure, the pressure induced from salt is actually a physiologically temporary rise. Rather, salt helps remove oil from the body and its potassium lowers blood pressure. Conclusions : It was suggested that salt pharmacopuncture of Korean sun-dried salt and processing salt should be made available for adjusting the physiological salt concentration and control of the Na side effects, therefore it would be useful in the treatment of diseases.

• 한국해양공학회지
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• 제25권5호
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• pp.15-20
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• 2011

This study carried out a series of experiments involving impact tests (Drop Weight type & Charpy type with a standard specimen and newly designed I-type specimen), hardness tests, and fracture surface observations of French-made roll shell steel (F), abnormal roll shell steel (M), reheated roll shell steel (R), and S25C steel under heat treatment conditiAn experimental study was carried out to study the solid-liquid mixture upward hydraulic transport of solid particles in vertical and inclined annuli with a rotating inner cylinder. The lift forces acting on a fluidized particle play a central role in many important applications such as the removal of drill cuttings in horizontal drill holes, sand transport in fractured reservoirs, sediment transport, the cleaning of particles from surfaces, etc. In this study a clear acrylic pipe was used to observe the movement of solid particles. Annular velocities varied from 0.4 to 1.2 m/s. The effect of the annulus inclination and drill pipe rotation on the carrying capacity of a drilling fluid, particle rising velocity, and pressure drop in a slim hole annulus were measured for fully-developed flows of water and aqueous solutions of CMC (sodium carboxymethyl cellulose) and bentonite. The rotation of the inner cylinder was efficient at carrying particles to some degree. For a higher particle volume concentration, the hydraulic pressure loss of the mixture flow increased because of the friction between the wall and solids or between solids.

• 한국환경보건학회지
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• 제40권5호
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• pp.397-406
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• 2014

Objectives: Perchloroethylene (PCE) is a volatile chemical widely used as a solvent in the dry-cleaning and textile processing industries. It was evaluated as Group 2 "probably carcinogenic to humans" by the Integrated Risk Information System (IRIS) of the United State Environmental Protection Agency (U.S. EPA) in 2012. In order to provide a scientific basis for establishing risk management measures for chemicals on the national priority substances list, aggregate risk assessment was conducted for PCE, included in the top-10 substances. Methods: We conducted the investigation and monitoring of PCE exposure (e.g., exposure scenario, detection levels, and exposure factors, etc.) and assessed its multi-media (e.g., outdoor air, indoor air, and ground water) exposure risk with a deterministic and probabilistic approach. Results: In human risk assessment (HRA), the level of human exposure was higher in the younger age group. The exposure level through inhalation at home was the highest among the exposure routes. Outdoor air or uptake of drinking water represented less than 1% of total contributions to PCE exposure. These findings suggested that the level of risk was negligible since the Hazard Index (HI) induced by HRA was below one among all age groups, with a maximum HI value of 0.17 when reasonable maximum exposure was applied. Conclusion: In conclusion, it was suggested that despite low exposure risk, further studies are needed considering main sources, including occupational exposure.

• 한국진공학회지
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• 제20권2호
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• pp.86-92
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• 2011

본 연구에서는 새롭게 개발된 센서인 in-situ particle monitor (ISPM)와 기존센서의 기능을 업그레이드 한 센서인 self-plasma optical emission spectroscopy (SPOES)를 이용해 화학기상증착 진공공정을 진단하였다. 본 연구에서 사용된 증착공정 장비는 silane 가스를 이용한 silicon plasma enhanced chemical vapor deposition과 borophosphosilicate glass 증착장비이다. 두 장비의 증착 또는 클리닝 조건에서의 배출되는 오염입자와 배기가스를 개발된 센서를 이용해 공정상태를 실시간으로 진단하는 것과 개발된 센서의 센싱 능력을 검증하고자 하는 목적으로 연구가 진행되었다. 개발된 센서는 장비 배기구 설치되었으며, 공정압력, 유량, 플라즈마 파워 등의 공정변수 변화에 따른 오염입자 크기 및 분포와 배기 부산물의 변화를 측정하고, 측정 결과의 상호 연관성을 분석하였다.

• 식품보건융합연구
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• 제6권5호
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• pp.19-25
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• 2020

The purpose of this study was to research and develop a step-type chemical liquid deodorizer including a liquid catalyst that can prevent civil complaints due to odor due to its excellent deodorizing performance. The main composition of chemical liquid deodorizer including liquid catalyst is cleaning deodorization, catalyst deodorization, chemical deodorization, water film plate, deodorization water circulation device, deodorization water injection device, catalyst management system, gas-liquid separation device, chemical supply device, deodorizer control panel, etc. It consists of a device. The air flow of the step-type liquid catalyst chemical liquid deodorizer is a technology that firstly removes basic odor substances, and the liquid catalyst installed in the subsequent process stably removes sulfur compounds, which are acidic odor substances, to discharge clean air. The efficiency of treating the complex odor of the prototype was 98.5% for the first and 99.6% for the second, achieving the target of 95%. The hydrogen sulfide treatment efficiency of the prototype was 100% for the first and 99.9% for the second, which achieved 95%, which was the target of the project. As a result, ammonia was removed by the reaction of ammonia and hydrogen sulfide.

• 한국입자에어로졸학회지
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• 제14권4호
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• pp.89-95
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• 2018

People's environmental concerns for fine particles in Korea lead to the strong necessity of improving the performance of environmental control systems. Wet electrostatic precipitators (ESPs) are considered as one of the alternatives to overcome the limit of previous dry ESPs, the re-entrainment of collected particles during rapping and back corona problem for high electrical resistivity dusts etc. In this study, a wire-cylindrical ESP with a thin water film has been developed. Particle collection characteristics were compared in the ESP with operations of water film on and off. Particle collection efficiencies at various applied voltages as well as voltage-current curves were almost the same in the ESP with and without a water film. Particle collection performance for PM1.0, PM2.5 and PM10 in the wet ESP with a water film was constantly maintained with operation time even in the high dust loading environment. This results indicate that a uniform water film in our wet ESP was successfully formed with a very thin layer without any dry spot and therefore could continuously clean the collected particles on the inner wall of the ESP without any performance degradation.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2014년도 추계학술대회
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• pp.854-856
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• 2014

일인 다기기 시대에 맞추어 스마트 기기로 다양한 가전제품과 전자기기를 스마트 디바이스를 이용하여 제어 가능하게 출시하고 있다. 또한, 청소로봇과 냉장고, 에어컨, TV 등의 제품 수가 빠르게 증가하고 있으며 이러한 기기들을 이용하여 DLNA(Digital Living Network Alliance) 시스템을 구축하고 있다. 그리고 국내외에서 IoT(Internet Of Things)나 Alljoyn 같은 기술들을 개발 및 제공하고 있다. 하지만 현재 사용하고 있는 가전제품이나 전자기기들은 운영체제가 설치되어있는 제품보다 설치되어있지 않은 제품이 많다. 또한, 스마트 가전제품을 사용하지 않는 사용자는 스마트 가전제품 보다는 기존의 전자제품을 구입하는 경우가 더 많이 발생한다. 본 논문에서는 모바일 기기를 사용하여 사용자가 원하는 데이터를 수치화하고 아두이노 보드에 전송하여 운영체제가 없는 기존의 가전제품도 스마트 기기와 같은 제어를 할 수 있도록 하는 시스템을 제안하고 구현한다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2014년도 추계학술대회
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• pp.845-847
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• 2014

최근, 모바일 OS 시장이 확대됨과 동시에 안드로이드가 탑재된 각종 스마트폰 및 에어컨, 스마트 TV, 청소로봇, 카메라 등 그 수가 빠른 속도로 보급되고 있다. 하지만 많은 기기들을 한 번에 제어하는 모듈 및 어플리케이션이 보급되지 않고, 한 기기의 제어를 한 어플리케이션이 담당하고, 하나의 디바이스에서 모든 기기들을 관리할 수 있는 어플리케이션이 부족한 실정이다. 이에 따라, 본 논문에서는 Web을 이용하여 Server에 등록되어있는 기기를 Web으로 관리, 접속, 제어할 수 있는 시스템을 제안 및 설계하였다. 이는 현재 연구가 활발히 진행 중인 IoT(Internet of Things)분야에 활용될 것으로 사료된다.