생활폐기물 소각시설의 저위발열량 산정식 마련에 관한 연구

손준익,강준구,권영현,권은혜,김기헌,전태완,신선경 한국폐기물자원순환학회(구 한국폐기물학회) 2016 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2016 No.-

폐기물의 저위발열량은 처리폐기물에 포함된 연간에너지를 산출하는 기초단위로서 저위발열량의 정확성에 따라 에너지회수율 산정의 신뢰도가 좌우된다. 또한, 저위발열량은 폐기물 소각시설의 효율성 등과 관련된 매개변수에 영향을 미치는 가장 중요한 요소로서 삼성분(회분/수분/가연분) 분석법, Dulong 산정식(원소분석법, C/H/O/N/S/Cl), 발열량계(시료 1g 실측) 분석법 등을 이용하여 산정하고 있으나 산정방법에 따라 발열량 편차가 크게 나타난다. 따라서 연간 투입되는 폐기물에 대하여 정형화된 산정식(Net Calorific Value)을 이용하고 있는 EU을 바탕으로 국내 생활폐기물 소각시설에 적합한 정형화된 저위발열량 산정식을 도출하고 사용에 대하여 검토하였다. EU에서는 50개(주로 독일)의 생활폐기물(Municipal Solid Waste) 소각시설을 대상으로 입열량과 출열량에 대한 측정 및 추정결과를 바탕으로 저위발열량 산정식(NCV)을 도출하였다. EU의 NCV 산정식은 매우 간단하지만 신뢰할 만한(±5%) 계산방법으로서 보일러 효율 및 열손실(증기 흡수열, 배출가스 보유열, 바닥재 열손실 등)이 고려되었다. 이에 본 연구에서는 생활폐기물 소각시설 53개소를 대상으로 폐기물 투입량, 보조연료 공급량, 보일러 증기생산량 등의 1년간 운영 데이터와 현장측정 당일의 운영 데이터를 조사하였다. 측정·조사 결과와 EU의 NCV산정식을 바탕으로 「KS B 6205 육상용 보일러의 열정산방식」을 이용하여 식 (2)와 같은 저위발열량 산정식을 도출하였으며, 국내 실정에 맞게 산정식을 단순화하여 식 (3)과 같이 나타내었다.

Comparison of Prognostic Value Between Stimulated and Nonstimulated Thyroglobulins in Differentiated Thyroid Cancer: A Retrospective Study

손준익 대한핵의학회 2023 핵의학 분자영상 Vol.57 No.6

Purpose The growing incidence of differentiated thyroid cancer (DTC) demands dependable prognostic factors to guide follow-up and treatment plans. This study investigated the prognostic value of response to therapy (RTT) assessment using TSHstimulated-thyroglobulin (sti-Tg) and nonstimulated-thyroglobulin (nonsti-Tg) and evaluates whether RTT using nonsti-Tg(nonstiRTT) can replace RTT using sti-Tg (stiRTT) in clinical practice to improve patients’ quality of life during assessment. Methods We enrolled 419 DTC patients who underwent total thyroidectomy, radioactive iodine (RAI) therapy, and Tg assessment. Patients with structural incomplete responses were excluded. Initial RTT assessments based on the 2015 AmericanThyroid Association guidelines (excellent response; ER, indeterminate response, biochemical incomplete response) wereperformed 6–24 months after RAI therapy. The second RTT assessments were performed 6–24 months after the first assessment. Statistical analysis for recurrence-free survival (RFS) was done with the log-rank test for stiRTT and nonstiRTT. Results Although initial stiRTT and nonstiRTT were significant predictors for RFS (p < 0.0001), stiRTT provided betterRFS prediction than nonstiRTT. The RFS analysis of the second RTT assessment demonstrated statistical significance onlyfor stiRTT (p < 0.0001). In 116 patients classified as ER on initial stiRTT, there was no RFS difference between patientsclassified as ER on either second stiRTT or nonstiRTT. Conclusion The prognostic power of stiRTT surpasses that of nonstiRTT in both the initial and second RTT assessment. Nevertheless, among patients classified as ER on initial stiRTT, a second stiRTT may not be required for those classified asER on the second nonstiRTT.

열분해시설의 적정 설치ㆍ운영을 위한 설치ㆍ관리 기준 및 세부검사방법

손준익 한국환경에너지공학회 2023 한국열환경공학회 학술대회지 Vol.2023 No.1

열분해 반응온도에 따른 하수슬러지의 유해물질 특성변화

손준익,홍용희,조성진,유흥민,김기헌 한국폐기물자원순환학회 2013 한국폐기물자원순환학회지 Vol.30 No.6

This paper analyzed thermal and carbonization properties of sewage sludge in fixed bed reactor and obtained following results. The heavy metal (Pb, Ni, Mn, Cr, Cu) content of Char showed the highest level at unprocessed sewage sludge, followed by carbonized sludge at 600, 400, and 500oC. It was thought to be mainly due to the yield of char rather than the influence of temperature. Also, the migration-test results of heavy metals satisfied the landfill directive in all samples, which may be possible to use it as landfill cover materials. The concentration of dioxin by changes of pyrolysis temperature was higher in the low temperature conditions and the proportion of PCDDs was higher than that of PCDFs.

Unexpected cardiac arrest in the neurosurgical ward

손준익,고명진,이영석,이신현,장주성,박용숙 대한정위기능신경외과학회 2023 대한정위기능신경외과학회지 Vol.19 No.1

ObjectiveThis study aimed to identify possible predictors of unexpected cardiac arrest (CA) in the neurosurgical ward. MethodsA retrospective review of 24 patients who experienced unexpected CA between January 2012 and March 2022 was conducted. Data on demographics, diagnoses, comorbidities, CA timing, pre-CA vital signs, transfer interval from intensive care unit (ICU) to ward, cardiac rhythm, neurological outcomes, and probable causes were collected. We excluded patients who died in the ICU and those with a do-not-resuscitate order. ResultsThe average age was 70.3 years. Vascular diseases and head traumas were common diagnoses. About 70.8% of arrests occurred during on-call time and 62.5% took place on weekends. The mean interval between ICU transfer and CA was 13.8±29.7 days, with 54.2% occurring within 4 days and 83.3% within 14 days. Pulseless electrical activity was the most frequent initial cardiac rhythm when CA occurred. Respiratory issues were the leading cause of CA (54.2%), and 91.7% of patients had poor neurological outcomes. Within 48 hours before CA, the average value of the lowest arterial oxygen saturation significantly deteriorated from 95.8±2.9% to 90.1±11.4%. ConclusionUnexpected CA often occurred on weekends and during night duty. Half of the cases took place within 4 days and over 80% within 2 weeks of transferring from the ICU to the ward, with respiratory problems being the main cause. Greater attention should be given to patients’ breathing patterns during night shifts and weekends, especially within the first 2 weeks after patients leave the ICU.

열탈착 시설을 이용한 가축 살처분 매몰지 침출수 처리 적용성 연구

손준익,정해영,김민영,홍용희,차준석,김기헌 한국폐기물자원순환학회(구 한국폐기물학회) 2012 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2012 No.-

부등침하를 받는 매설관 기초지반 보강 모델링 연구

손준익,홍성완 한국지반공학회 1991 대한토질공학회지 Vol.7 No.1

본 논문은 매설관 기초지반 보강의 적용성에 관해 연구한 것이다. 지반 보강상호작용해석에 의하여 연결된 파이프 부재 사이의 부등침하를 최소화 하고 이음부에 발생하는 응력집중 현상을 감소시킬 수가 있다. 부등침하를 받는 매설관 하부의 침하형태와 토압의 변화 형태, 그리고 보강재의 변형 형태를 분석하였다. 매설관은 일단은 구조물에 고정되어 있고 타단은 지반속에 매설된채 자유로 되어 있으며 지표면에 재하된 일정한 등분포 하중을 받는다. 실내모형실험과 유한요소 해석을 병행 하였으며, 해석결과를 비보강과 보강 조건에 대하여 상호비교하여 매설관 침하억제를 위한 지반보 강의 효과를 검토하였다. This paper reports the application study of the ground reinforcement under a pipe joint. The soil-reinforcement interaction helps to minimize the stress concentration at joint. The settlement pattern and the earth pressure variation have been evaluated under the pipeline subjected to differential settlement. The pipeline is fixed at one side with the other side set free being loaded with a uniform surface loading. The problem has been studied by means of laboratory model test and flite element technique, and the analysis results are compared for both non-reinforced and reinforced cases to evaluate the effectiveness of the soil reinforcement for restraining the settlement of the pipeline.

MBT시설 고형연료의 Fluff type 전환에 따른 에너지 절감효과 비교분석

손준익,홍용희,김영란,박재성,오길종,김기헌 한국폐기물자원순환학회 2014 한국폐기물자원순환학회지 Vol.31 No.3

In order to cope with resource depletion and global warming, many countries around the world are seeking the technicaland political alternatives and are focusing on production of refuse derived fuel (SRF) as a viable approach. SRF isclassified into pellet SRF and fluff SRF based on the shape. In domestic trend, Pellet RDF has been mainly produceduntil now, but as the quality standard of fluff SRF was set up lately, it is expected to raise supply and demand on FluffSRF after this. Fluff SRF is a solid fuel not to be processed pelletizing step, and has advantages that manufacturing processis simple and economical. In this paper, we selected 3 MBT plants to produce Pellet SRF in Korea and examined reductioneffects of energy and CO2 emission by conversion of pellet SRF to fluff SRF. As a result, the saving energy by theconversion of SRF type is 2,509 Gcal/yr (A), 1,716 Gcal/yr (B) and 1,210 Gcal/yr (C) respectively, and the reductionrate of energy consumption in full process is about 23%~26% by comparison with pellet SRF. Also, the average ofreduction of CO2 emission per unit of MSW is 0.0272 tCO2/ton. After estimating the reduction of CO2 emission of 9MBT plants in Korea, based on the results of a survey of target plants, we concluded that the reduction effect of CO2emission is created 11,374 tCO2/yr.

매설관 하부지반-보강재 상호작용의 수치모델 연구

손준익,정하익 한국전산구조공학회 1991 한국전산구조공학회논문집 Vol.4 No.3

본 논문에서는 유한요소해석을 통하여 부등침하를 받는 매설관 기초지반 보강의 적용성과 지반보강 상호작용에 의하여 매설관 연결부 하부에서의 부등침하를 최소화 할 수 있는 방안에 관하여 다루었다. 매설관의 일단이 구조물에 고정되어 있는 경계조건에 대하여 상호비교하여 지반보강에 따른 응력전이 효과와 이로인한 배설관 침하억제 효과를 수치적으로 분석하였다. This paper reports the application study of the ground reinforcement under a buried pipeline subjected to differential settlement via a finite element modeling. The soil-reinforcement interaction helps to minimize the differential settlement between the adjoining pipe segments. The settlement pattern and deformation slope of a pipeline have been evaluated for a boundary condition at the joint between a rigid structure and a pipeline. The analysis results are compared for both non-reinforced and reinforced cases to numerically evaluate the stress transfer mechanism and the effectiveness of the soil reinforcement for restraining the settlement of the pipeline.

폐자동차 파쇄잔재물 소각처리 시설에서의 소각열 에너지회수·사용률 현황

손준익,권영현,김기헌 한국폐기물자원순환학회 2016 한국폐기물자원순환학회지 Vol.33 No.6

In this study, a lower heating value for automobile shredder residue incineration facilities (12 facilities) was calculated using a heat balance method, and a recoverable energy potential was calculated after calculating the effective energy output and the effective energy use according to automobile shredder residue incineration. An analysis of the calculation results showed that the effective output and the effective use had average values of 64.5% (49.8-80.2%) and 31.3% (7.1-57.5%) in an ASR incineration plant, respectively. The calculated ratio of effective use to effective output was an average value of 33.2% (3.0-57.8%). Therefore, in order to improve the efficiency of effective energy used, it is necessary to make more effort to devise various measures.