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LLC DC-DC 트랜스포머를 이용한 LED 조명용 정전류 구동모듈
김형식(Hyung-Sik Kim),손대승(Dae-Seung Son),김상현(Sang-Hyeon Kim),김희준(Hee-Jun Kim) 대한전기학회 2011 대한전기학회 학술대회 논문집 Vol.2011 No.10-2
본 논문에서는 기존의 개별 단위 LED 구동 시스템과는 달리 PFC와 LLC DC-DC트랜스포머를 사용한 통합전원 시스템과 이 전원 시스템의 출력 전압을 이용한 Dimmable LED 구동 시스템을 새롭게 제시하였다. 제시된 시스템은 고밀도, 고효율 및 대용량화의 특징을 갖는다. 2kw급 통합 전원 시스템과 정전류 구동 모듈의 실험을 수행하였으며 그 결과 92.54%의 최대효율, 99.6%의 최대 역률을 얻을 수 있었다. 이를 통하여 본 시스템의 타당성을 확인 하였다.
정수처리 공정에서 모델 물질들을 이용한 천연유기물질 처리능 및 소독부산물 생성능 평가
손희종 ( Hee Jong Son ),정종문 ( Jong Moon Jung ),최진택 ( Jin Taek Choi ),손형식 ( Hyung Sik Son ),장성호 ( Seong Ho Jang ) 한국환경과학회 2013 한국환경과학회지 Vol.22 No.9
While a range of natural organic matter (NOM) types can generate high levels of disinfection by-products (DBPs) after chlorination, there is little understanding of which specific compounds act as precursors. Use of eight model compounds allows linking of explicit properties to treatability and DBP formation potential (DBPFP). The removal of model compounds by various treatment processes and their haloacetic acid formation potential (HAAFP) before and after treatment were recorded. The model compounds comprised a range of hydrophobic (HPO) and hydrophilic (HPI) neutral and anionic compounds. On the treatment processes, an ozone oxidation process was moderate for control of model compounds, while the HPO-neutral compound was most treatable with activated carbon process. Biodegradation was successful in removing amino acids, while coagulation and ion exchange process had little effect on neutral molecules. Although compared with the HPO compounds the HPI compounds had low HAAFP the ozone oxidation and biodegradation were capable of increasing their HAAFP. In situations where neutral or HPI molecules have high DBPFP additional treatments may be required to remove recalcitrant NOM and control DBPs.
Tetracycline계 항생물질들의 활성탄 흡착 및 생물여과 공정에 의한 생분해 특성
손희종 ( Hee Jong Son ),염훈식 ( Hoon Sik Yeom ),류동춘 ( Dong Choon Ryu ),장성호 ( Seung Ho Jang ),손형식 ( Hyung Sik Son ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.3
Adsorption and biodegradation performance of tetracycline antibiotic compounds such as ttetracycline (TC), oxytetracycline (OTC), minocycline (MNC), chlortetracycline (CTC), doxycycline (DXC), meclocycline (MCC), demeclocycline (DMC) on granular activated carbon (GAC) and anthracite-biofilter were evaluated in this study. Removal efficiency of seven tetracycline antibiotic compounds showed 54%∼97% by GAC adsorption process (EBCT: 5∼30 min). The orders of removal efficiency by GAC adsorption were tetracycline, demeclocycline, oxytetracycline, chlortetracycline, doxytetracycline, meclocycline and minocycline. Removal efficiencies of seven tetracycline antibiotic compounds showed 1%∼61% by anthracite biofiltration process (EBCT: 5∼30 min). The highest biodegradable tetracycline antibiotic compound was minocycline, and the worst biodegradable tetracycline antibiotic compounds were oxytetracycline and demeclocycline.
손형식,유영민 대한건축학회 2000 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.20 No.2
The aim of this paper was to get the guideline of space program of the radiation therapy department in general hospital. To do this 7 hospitals were chosen and analyzed for this study. As a result of the basic data for space program of radiation therapy department could be obtained.
조순자,정용주,이나은,이정은,손형식,이상준 부산대학교 환경문제연구소 2003 環境硏究報 Vol.21 No.-
Using acclimated sludge with inorganic nitrogen medium for three months and non-acclimated sludge, raw sludge, under aerobic condition we investigated characteristics biological nitrogen removal. As results, e acclimated sludge under aerobic condition accomplished nitrification efficiently. But the samples from the reactor operated raw sludge had higher ammonium concentration rather than the concentration which was loaded by the medium. This means when we are trying to reorganize existing facilities, we should take high initial ammonium concentration into account.