지렁이를 이용한 슬러지 안정화시 부하율의 영향 및 슬러지 종류별 안정화 가능성 검토

서성철,박종안,이노섭,배형석,이종화,허준무,김준현 순천향대학교 기초과학연구소 1997 순천향자연과학연구 논문집 Vol.3 No.2

Stabilization of organic sludges using earthworms was conducted in a laboratory to investigate the effect of feed rate on the vermistabilization, and feasibility of vermistabilization of various sludge was also carried out to further wider application of vermistabilization. Sludges used in this study were septic tank sludge, papermill sludge and brewery sludge. Sludge reduction, cast production, earthworm growth rate and cocoon production were monitored periodically to check degree of stabilization. Feed rate of septic tank sludge did not have a notable effect on the sludge reduction and cast production per unit weight or earthworm. There was also no difference in the earthworm growth rate per unit weight of the sludge removed among the different sludge feed rate. The amount of septic tank sludge, papermill sludge and brewery sludge per gram of earthworm per day were 0.06, 0.05, and 0.02g, respectively. The weight of increase of earthworm per unit weight of the sludge removed was 0.18g/g for the septic tank sludge, 0.21g/g for the papermill sludge, and only 0.06g/g for the brewery sludge. It was therefore concluded that brewery sludge was not suitable for vermistabilization mainly due to high organic content to be easily converted organic acid. The concentrations of several heavy metals, volatile solids, total organic carbon and total kjeldahl nitrogen in the cast were generally lower than those in the raw sludges.

Angle씨 Ⅲ급 부정교합자의 Activator치료 전후 head posture변화에 관한 연구

서형식,차경석 대한치과교정학회 1994 대한치과교정학회지 Vol.24 No.2

This study was carried out to research the adaptation patterns of head posture after activator therapy in functional class Ⅲ malocclusion patents. For this purpose, 29 functional class Ⅲ malocclusion patients, from the ages of 8 to 13 years old, were used. 1. Increse in capacity of oral cavity capacity were found in all the samples, but craniocervical angulation were varied into incresed group and decreased group after therapy. 2. Head posture exhibited the compensatory adaptation in the relative growth increments of the vertical dimension, ALFH and PLFH. 1) A group with more PLFH and less sagittal angle showed relatively small growth increment in PLFH during the treatment period, thus craniocervical angulation was increased. 2) A group with less PLFH and more sagittal angle showed relatively great growth incrmenet in PLFH during the treatment period, thus craniocervical angulation was decreased.

금속-반도체-금속 광검출기 내부 이종접합 경계면에서의 캐리어 포획에 의한 검출 효율 감소에 관한 모델링

金炯奭,徐鍾旭 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.2

암전류를 줄이기 위해서 사용한 wide-bandgap 반도체 덮개층이 금속-반도체-금속 광검출기(MSMPD)의 검출 효율 감소에 미치는 영향을 정량적으로 분석하기 위하여 MSMPD내부 이종접합 경계면에서의 캐리어 포획 현상을 연구하였다. 이종접합 경계면에서의 전위 우물을 infinite Airy well로 가정하고 양자역학적인 면을 고려하여 우물내에서 수치 해석적 반복법을 이용해서 Schrodinger 방정식과 Poisson 방정식의 self-consistent 해를 구하였다. AlGaAs 덮개층에 의해 이종접합 경계면에서 많은 캐리어가 포획됨을 알 수 있었다. 경사층에 대해서는 고려하지 않았는데, 실험 결과에 의하면 경사층을 사용함으로써 이종접합 경계면에서의 캐리어 포획량을 감소시켜서 검출 효율을 증대시킬수 있다.

반발도 및 초음파속도에 의한 콘크리트의 압축강도 추정

임서형,황진석 진주산업대학교 산업과학기술연구소 2007 산업과학기술연구소보 Vol.- No.14

The purpose of this study is to suggest the non-destructive equation for the estimation of compressive strength of concrete by rebound hammer, ultrasonic pulse velocity and combined method. To improve the proposed non-destructive equation under domestic situation in Korea, more than 450 test data domestically available in the literature and having the range of 400 to 1,200kgf/cm^(2) as compressive strength of concrete were collected and analyzed statistically. As a rusult of this study, it is possible to predict the compressive strength of concrete and the equations for prediction are following. 1) F = 0.85R^(2) -48.5R + 1169 2) F = 0.028K^(2) - 6.3K +829 3) F = 0.03K^(2) - 8.5K -978(w/c) +1430 Where, F : compressive strength(kgf/cm^(2)), R : rebound number, K = R × V, V : ultrasonic pulse velocity(km/s)

세라믹튜브 및 패킹형 플라스틱 여재충전 혐기성 여상의 유가공 폐수 처리특성 및 반응조 내부거동

허준무,장봉기,서성철,박종안,이종화,배형석,김준현 순천향대학교 기초과학연구소 1997 순천향자연과학연구 논문집 Vol.3 No.2

This study was carried to develop of anaerobic reactor to be able to maximize the organic removal efficiency using laboratory-scale anaerobic filter. The ceramic tube and pall ring media were tested for the applicability as packing media of anaerobic filter for the treatment of a dairy waste. This study was conducted to determine the anaerobic treatability of a dairy waste, and investigate the effects of ceramic tube and pall ring media. Anaerobic filters were packed with packing volume of 65% of total working volume. When treating a dairy waste, the organic removal efficiency of anaerobic filter packed with pall rings was a little higher than that of anaerobic filter packed with ceramic tubes. This was because the reactor packed with ceramic tube had clogging problems and substrate transfer limitations. It seemed that the reactor packed with ceramic tubes had uneven packing due to structural characteristics. The COD removals of ceramic tube and pall ring anaerobic filters were greater than about 91% and 94%, respectively, at organic loading rate lower than 5kgCOD/㎥/d. The COD removals of both reactors decreased to 80% with organic loading rate of 10kgCOD/㎥/d. Biomass capture and solid-liquid-gas separation efficiency seemed to vary with the type of media.

Electron Cyclotron Resonance O_2 Plasma에서 증착한 규소 산화 박막의 특성

안명환,서문석,장재선,서성모,이기방,윤창주,이형재,남기석,최규현,손춘배,김용섭,강석희 全北大學校 基礎科學硏究所 1994 基礎科學 Vol.17 No.-

규소 산화막을 ECR-CVD(electron cyclotron resonance-chemical vapor deposition) 증착방법으로 5인치 기판위에 상온에서 증착하고, 증착공정조건인 증착율, 기판온도, 마이크로파의 세기변화 및 플라즈마 혼합기체의 비에 따른 규소 산화막의 특성을 조사하였다. 또한 산화막의 구조적인 특성을 비교하기 위해 FTIR을 이용하여 ECR-CVD 증착한 산화막, RPE-CVD(remote plasma enhanced-CVD) 증착한 산화막 및 열 산화막의 stretching frequency를 측정하였다. 측정된 결과 ECR-CVD로 증착된 산화막이 구조적인 면에서 열 산화막과 거의 같음을 보였다. ECR-CVD로 증착된 산화막의 전기적인 특성을 전류-전압 및 축전-전압 측정에의하여 분석하였다. 축전된 산화막의 전기적인 특성은 산화막의 전하 밀도는 1×10 exp (11)/㎠이였고, 평균 절연 파괴 전압은 약 6 MV/㎝이다. We have grown thin films of SiO_2 at room temperature by using an ECR-CVD system and have investigated the changes in the properties of the deposited films with changes in the processing conditions such as the deposition rate, the substrate temperature, the microwave power and the plasma gas mixing ratio. We also measured the stretching frequency of three kinds of oxides, and ECR-CVD-grown oxide, a PECVD-grown oxide, and a thermally grown oxide, using FTIR analysis to compare their structural properties. The result shows that the structural properties of the ECR-grown oxide are similar to those of the thermally grown oxide. Additionally, the electrical properties of the ECR-grown oxide were investigated by using current-voltage and capacitance-voltage measurements. These electrical results indicate that the oxide charge density and the average breakdown voltage are 1×10 exp (11) ㎝^-2 and 6 MV/㎝, respectively.

일부 도시지역 인문고교생의 체격과 영양상태에 관한 연구

윤태영,최중명,박순영,유동준,김형석,구도서,박양원 慶熙大學校 醫科大學 1986 慶熙 醫大 論文集 Vol.11 No.1

Accelerated Resting-State Functional Magnetic Resonance Imaging Using Multiband Echo-Planar Imaging with Controlled Aliasing

Seo, Hyung Suk,Jang, Kyung Eun,Wang, Dingxin,Kim, In Seong,Chang, Yongmin Korean Society of Magnetic Resonance in Medicine 2017 Investigative Magnetic Resonance Imaging Vol.21 No.4

Purpose: To report the use of multiband accelerated echo-planar imaging (EPI) for resting-state functional MRI (rs-fMRI) to achieve rapid high temporal resolution at 3T compared to conventional EPI. Materials and Methods: rs-fMRI data were acquired from 20 healthy right-handed volunteers by using three methods: conventional single-band gradient-echo EPI acquisition (Data 1), multiband gradient-echo EPI acquisition with 240 volumes (Data 2) and 480 volumes (Data 3). Temporal signal-to-noise ratio (tSNR) maps were obtained by dividing the mean of the time course of each voxel by its temporal standard deviation. The resting-state sensorimotor network (SMN) and default mode network (DMN) were estimated using independent component analysis (ICA) and a seed-based method. One-way analysis of variance (ANOVA) was performed between the tSNR map, SMN, and DMN from the three data sets for between-group analysis. P < 0.05 with a family-wise error (FWE) correction for multiple comparisons was considered statistically significant. Results: One-way ANOVA and post-hoc two-sample t-tests showed that the tSNR was higher in Data 1 than Data 2 and 3 in white matter structures such as the striatum and medial and superior longitudinal fasciculus. One-way ANOVA revealed no differences in SMN or DMN across the three data sets. Conclusion: Within the adapted metrics estimated under specific imaging conditions employed in this study, multiband accelerated EPI, which substantially reduced scan times, provides the same quality image of functional connectivity as rs-fMRI by using conventional EPI at 3T. Under employed imaging conditions, this technique shows strong potential for clinical acceptance and translation of rs-fMRI protocols with potential advantages in spatial and/or temporal resolution. However, further study is warranted to evaluate whether the current findings can be generalized in diverse settings.

Clinicopathologic characteristics and outcomes of gastric cancers with the MSI-H phenotype

Seo, Hyung Min,Chang, Yeon Soo,Joo, Sun Hyung,Kim, Youn Wha,Park, Yong-Koo,Hong, Sung Wha,Lee, Suk-Hwan Wiley Subscription Services, Inc., A Wiley Company 2009 Journal of surgical oncology Vol.99 No.3

<B>Objectives</B><P>We examined the correlation between microsatellite instability (MSI) status and the clinicopathological features and prognostic value in gastric cancer and compared the efficacy of immunohistochemical staining for hMLH1 and hMSH2 with a polymerase chain reaction (PCR)-based test.</P><B>Methods</B><P>MSI status was examined in 328 consecutive gastric adenocarcinomas using tissue preserved in paraffin blocks. DNA extracted from tumor sections and the corresponding normal tissue was analyzed using PCR at the five microsatellite loci recommended by the National Cancer Institute (NCI). Immunohistochemical staining for hMLH1 and hMSH2 was performed and the results were compared with the MSI status measured using PCR. The relationship of the clinicopathologic variables to MSI status was analyzed.</P><B>Results</B><P>Of the gastric cancers, 8.2% (n = 27) contained MSI-H and this was associated with older age (>70 years), distal tumor location, tumor size, and intestinal subtype. Lymphatic and vascular invasion were associated with the disease-free survival. On immunohistochemical staining, the loss of expression of hMLH1 or hMSH2 was observed in 11% (n = 36). The sensitivity, specificity, positive predictive value, negative predictive value, and accuracy of immunohistochemical staining were 63.0%, 93.7%, 47.2%, 96.6%, and 91.2%, respectively.</P><B>Conclusions</B><P>Gastric cancers with MSI-H have specific clinicopathologic characteristics, such as older age at diagnosis, distal tumor location, increased tumor size, and intestinal histologic type. However, immunohistochemical staining for hMLH1 and hMSH2 is not as accurate as the PCR-based MSI test. J. Surg. Oncol. 2009;99: 143–147. © 2008 Wiley-Liss, Inc.</P>

원격판독 의료기관에서 시행한 원격판독의 동료평가: 세부전공분야와 촬영장비에 따른 판독 불일치 정도와 불일치 판독의 임상적 의의 비교

Seo Hyung Suk,Park Jai Soung,Oh Yu-Whan,Sung Dongwook,Lee A Leum 대한영상의학회 2021 대한영상의학회지 Vol.82 No.6

Purpose The purpose of this study was to evaluate the rates of unacceptable diagnosis and clinically significant diagnostic discrepancy in radiology sections and imaging modalities through a peer review of teleradiology. Materials and Methods Teleradiology peer reviews in a Korean teleradiology clinic in 2018 and 2019 were included. The peer review scores were classified as acceptable and unacceptable diagnoses and clinically insignificant and significant diagnostic discrepancy. The diagnostic discrepancy rates and clinical significance were compared among radiology sections and imaging modalities using the chi-square test. Results Of 1312 peer reviews, 117 (8.9%) cases had unacceptable diagnoses. Of 462 diagnostic discrepancies, the clinically significant discrepancy was observed in 104 (21.6%) cases. In radiology sections, the unacceptable diagnosis was highest in the musculoskeletal section (21.4%) (p < 0.05), followed by the abdominal section (7.3%) and neuro section (1.3%) (p < 0.05). The proportion of significant discrepancy was higher in the chest section (32.7%) than in the musculoskeletal (19.5%) and abdominal sections (17.1%) (p < 0.05). Regarding modalities, the number of unacceptable diagnoses was higher with MRI (16.2%) than plain radiology (7.8%) (p < 0.05). There was no significant difference in significant discrepancy. Conclusion Peer review provides the rates of unacceptable diagnosis and clinically significant discrepancy in teleradiology. These rates also differ with subspecialty and modality. 목적 동료평가를 시행하여 원격판독 불일치의 정도와 불일치 판독의 임상적 의의를 세부전공분야와 촬영장비별로 평가하고자 하였다. 대상과 방법 한 국내 원격판독 의료기관에서 2018년과 2019년에 시행한 동료평가를 대상으로 세부전공분야와 촬영장비별로 판독 불일치를 분석하였다. 동료평가 점수를 적격 진단과부적격 진단으로 분류하였고, 판독 불일치는 임상적 의의에 따라 무의한 불일치와 유의한 불일치로 분류하였다. 카이제곱 검증으로 통계를 시행하였다. 결과 총 1312건의 동료평가 중 부적격 진단은 117건(8.9%)이고, 총 462건의 진단 불일치 중유의한 불일치는 104건(21.6%)이었다. 세부전공분야에서 부적격 진단율은 근골격(21.4%)이가장 높았고(각각 p < 0.05), 복부(7.3%)는 신경두경부(1.3%)에 비해 높았다(p < 0.05). 유의한 불일치는 흉부(32.7%)가 복부(17.1%)와 근골격(19.5%)에 비해 높았다(각각 p < 0.05). 촬영장비에서 부적격 진단은 MR (16.2%)이 일반촬영(7.8%)에 비해 높았고(p < 0.05), 유의한불일치는 차이가 없었다. 결론 동료평가를 통해서 원격판독의 부적격 진단과 임상적 유의한 불일치의 정도, 세부전공분야와 촬영장비에 따른 차이를 알 수 있었다.