평신도를 품에 안고 : 살며 생각하며 ; 이 참담한 이름 개독교인(改督敎人)

장석현 기독교대한성결교회 활천사 2013 활천 Vol.710 No.-

The Removal of Heavy Metal lons in Aqueous Solution by Hydroxyapatite/Polyurethane Composite Foams as a New Adsorbent

장석현,민병길,이상철 한국고분자학회 2006 한국고분자학회 학술대회 연구논문 초록집 Vol.2006 No.4

COPD와 양도락의 진단적 관련성에 대한 연구

장석현,김상진,정희재,정승기,이범준,Jang, Seok-Hyun,Kim, Sang-Jin,Jung, Hee-Jae,Jung, Sung-Ki,Lee, Beom-Joon 대한한방내과학회 2014 大韓韓方內科學會誌 Vol.35 No.4

Objectives: Ryodoraku is a physiological function test using electric current. Since it can evaluate the patient's overall condition as well as a function of individual organs, Ryodoraku can be assumed as an effective way to diagnose chronic obstructive pulmonary disease (COPD). Therefore, this study aimed to investigate the values of Ryodoraku for diagnosing COPD. Methods: We designated a COPD group, who were over 40 and satisfying COPD criteria, $FEV_1$/FVC<0.7. The Control group also consisted of members over 40 years old but without COPD and any other lung disease. We conducted a comparative study by checking the Ryodoraku score (RS), the average of Rt.&Lt. H1 (mean H1), the mean difference value between both H1s (${\mid}H1^R-H1^L{\mid}$) and the ratio of patients whose RS was under 40. Then we investigated the correlation between the mean H1 and the results of pulmonary function test (PFT). Results & Conclusions: In the COPD group, RS, mean H1 and ${\mid}H1^R-H1^L{\mid}$ were significantly lower and the ratio of 'RS<40' patients was meaningfully higher than in the Control group. On the other hand, PFT seems not to be replaced by Ryodoraku since there was no correlation between mean H1 and the results of PFT. Though more experiments and researches are needed to be further confirmed, Ryodoraku is expected to be an adequate way for prediagnosing and following up the COPD patients.

벼 직파재배의 문제점과 개선방안

장석현 단국대학교 최고농업경영자과정 2000 논문집 Vol.3 No.-

일부 생활제품에서 방출되는 라돈·토론의 측정 및 피폭선량평가

장석현 한국분석과학회 2020 학술대회논문집 Vol.2020 No.6

병렬 설치형 저압막 모듈 배관의 유량 균등 분배 평가에 관한 연구

장석현,윤석민,김시연,이영주,박노석 대한환경공학회 2021 대한환경공학회지 Vol.43 No.5

Objectives : In this study, the degree of uniformity of the flow rate flowing into each module is measured for the external pressure typed low-pressure membrane (microfiltration) filtration process that has been actually applied to water treatment, and computational fluid dynamics (CFD) technique is used to clarify the cause and effect. Methods : Mobile ultrasonic flow meter was used to measure the flow rate flowing from the membrane module pipe to each module, and the CFD technique was used to verify this. Results and Discussion : From the results of the actual measurement using ultrasonic flowmeter and CFD simulation, it was confirmed that the outflow flow rate from the branch pipe located at the end of the header pipe was three times higher than that of the branch pipe near the inlet. The reason was that the differential pressure generated between each membrane module was higher toward the end of the header pipe. Conclusions : When the ratio of the sum of the cross-sectional area of the branch pipe and the cross-sectional area of the header pipe was reduced by about 30 times, it was confirmed that the flow rate flowing from each branch pipe to the membrane module was almost equal. Also, If the flow in the header pipe is transitional or laminar (Reynolds No. is approximately 4,000 or less), the flowrate flowing from each branch pipe to the membrane module can be more even. 목적 : 본 연구에서는 실제 정수처리에 적용되고 있는 외압식 저압막(정밀여과막, Microfiltration) 여과 공정을 대상으로 각 모듈로 유입되는 유량의 균등 정도를 실측하고, 전산유체역학(Computational Fluid Dynamics, CFD)를 이용하여 그 원인을 밝히고자 하였다. 방법 : 본 연구에서는 막 모듈배관에서 각 모듈로 유입되는 유량을 측정하기 위해 이동형 초음파 유량계를 사용하였으며, 이를 검증하기 위해 전산유체역학 기법을 이용하였다. 결과 및 토의 : 초음파 유량계를 이용한 실측과 CFD 모사 결과로부터 헤더 배관 끝단에 위치한 분지관으로부터의유출 유량이 유입구 근처의 분지관 유량보다 3배 높았다. 그 이유는 각 막 모듈 사이에서 발생하는 차압이 헤더파이프 끝으로 갈수록 더 높았기 때문이다. 결론 : 지관의 단면적의 합과 헤더 배관의 통수 단면적의 비를 약 80배 정도 감소할 경우 각 분지관에서 막 모듈로유입되는 유량이 거의 균등한 것을 확인 할 수 있었다. 또한 관내 흐름이 천이류 및 층류인 경우(Reynolds No.가대략 4,000이하) 각 분지관에서 막 모듈로 유입되는 유량을 균등화 시킬 수 있을 것으로 판단할 수 있다.

유약 밀봉 갑발 번조에 관한 연구

장석현 한국도자학회 2023 한국도자학연구 Vol.20 No.3

A saggar firing is a manufacturing method used to produce China's imperial porcelain, Korea's Goryeo Dynasty celadon, and Joseon Dynasty royal white porcelain. It is manufactured to match the shape of the object, preventing wood ash from settling when the object is placed, and effectively performing reduction burns while preventing strong flames from directly contacting the object. The utilization of modern Gapbal burning is minimal, and it is only used for certain specific purposes, such as carbonization in fireproof sag, cinnabar glaze Gapbal burning, and use of the fire kiln burning process. This study focuses on China's colorimetric porcelain production technique by reexamining the usefulness of Gapbal making, and aims to present the expandability of the making technique by revealing the effectiveness of colorimetric porcelain production technique through experiments and results. The Chinese Yuejuyo colorimetric porcelain manufacturing technique involves sealing the shell with glaze and then making it. From the time the glaze is melted, the inside of the glaze is sealed, and after the firing is finished, the cooling reduction effect creates an environment and conditions in which the metal oxides of the clay and glaze can be completely reduced. As an experiment based on such a premise, it was decided to investigate and reveal how the clay and glaze actually react in the results of firing a glaze-sealed box. As an experimental method, a small box was manufactured, and specimens were produced with two types of white porcelain clay and celadon clay depending on the iron content. We investigated the differences in the results of each specimen produced by applying glaze to the entrance of the joint and melting and sealing it to create a vacuum state. When comparing the results of gas kiln carbonization firing and electric kiln reduction firing depending on the firing atmosphere, it was confirmed that the result was that the clay and glaze were in a completely reduced state within the glaze seal box. As a result, the difference in brightness and saturation of the glaze color and soil of the specimens within each cluster and the unused specimen was clearly distinguished. What is particularly noteworthy is that the reduction state was clearly distinguished from the electric kiln reduction process. This is a method that can compensate for the reduction state that was lacking in electric kiln reduction firing, and at the same time, it presents a method of producing ceramics in different reduction states through the firing process of one kiln. This study reveals a way to create a differentiated atmosphere through complete reduction and suggests ways to expand the pottery technique and improve the quality of ceramics. 갑발 번조는 중국의 황실도자기와 한국의 고려시대 청자와 조선시대 왕실 백자 제작에 사용되었던번조 방법이다. 기물의 형태에 걸맞게 제작되어 기물을 넣어 나뭇재가 앉는 것을 방지하고, 센 불길이기물에 직접 닿지 않게 하면서 환원 번조를 효과적으로 수행하는 역할을 한다. 현대의 갑발 번조 활용도는 미비하며 내화갑 내 탄화번조, 진사유약 갑발 번조, 장작가마 번조과정 활용 등 일부 특정한 목적에 실행되고 있는 실정이다. 본 연구는 갑발 번조의 활용성에 대한 재조명으로 중국의 비색자기를제작하는 기법에 관심을 두고, 실험과 결과를 통해 비색자기 제작기법의 효과를 밝혀 번조기법의 확장성을 제시하고자 한다. 중국 월주요의 비색자기 제조기법은 갑발을 유약으로 밀봉하여 번조하는 기법이다. 유약이 용융된 시점으로부터 갑발 안이 밀폐상태를 이루고 번조가 끝난 후 냉각환원 작용으로인해 태토와 유약의 금속산화물이 완전히 환원 될 수 있는 환경과 조건이 성립되었다고 본다. 그러한전제를 조건으로 한 실험으로, 유약으로 밀봉된 갑발의 번조결과가 실제로 태토와 유약이 어떻게 반응하는지에 대해 알아보고 밝히기로 하였다. 실험 방법으로 소형 갑발을 제작하고 철분 함량에 따른 두가지 백자태토와 청자태토로 시편을 제작하였다. 합 입구에 유약을 발라 번조 후 용융 밀봉되어 진공상태가 되도록 하는 갑발, 요철이 있는 갑발, 일반 갑발, 갑발 미사용에서 번조된 각 시편 결과물 차이를 알아보았다. 번조 분위기에 따른 가스가마 탄화번조, 전기가마 환원번조에 따른 결과물을 비교 하였을 때, 유약 밀봉 갑발 안에서 태토와 유약이 완전 환원상태의 결과물이 나왔음을 확인할 수 있었다. 그 결과에서 가 명확히 구별되었으며, 특히 주목 할 점은 전기가마 환원번조에서 환원상태가 명확하게 구별되는 결과물이 도출된 것이다. 이는 전기가마 환원번조에서 부족했던 환원 상태를 보완 할 수 있는 방법이 되면서도, 동시에 한 가마의 번조과정을 통해 각기 다른 환원상태의 도자를 제작 할 수 있는 방법이 제시 된 것이다. 본 연구는 완전환원으로 차별화된 분위기를 연출할 수 있는 방식을 밝혀 번조기법에 대한 확장성과 도자의 질적 향상의 방법을 제시한다.

RF 마그네트론 스퍼터링 시스템을 이용하여 증착한 AGZO 박막의 Ar 유량에 따른 구조적, 전기적, 광학적 특성

장석현,김덕규 한국전기전자재료학회 2022 전기전자재료학회논문지 Vol.35 No.1

AGZO thin films were deposited on glass substrates using RF magnetron sputtering system under Ar flow rates, and their structural, electrical, and optical properties were analyzed systematically. As a result of the XRD pattern, the peak of the (002) (2θ≈33.7˚) orientation was observed, and it was found to have a hexagonal wurtzite structure. The sheet resistance of Ar 5 sccm was 3.073×102 Ω/sq and showed the best electrical properties because of the improvement of mobility due to the increase of the grain size and the variation of RMS roughness. In addition, the average transmittance was more than 90% for all samples, which demonstrated good optical properties. It is expected that the TCO characteristics can be improved by controlling Ar flow rates, and this will increase the efficiency of photoelectronic devices such as OLED and solar cells.

평신도를 품에 안고 : 나의 감사 일주일-윈프리 다이어리 ; 감사는 마중물 같아서

장석현 기독교대한성결교회 활천사 2012 활천 Vol.707 No.-

조선후기 임실현 양반사회의 지속과 변화-『임실향안』, 『임실 청금안』을 중심으로-

장석현 조선시대사학회 2023 朝鮮時代史學報 Vol.- No.105

This paper explores the composition of the local yangban society in Imsil-hyeon during the late Joseon period. Using a case study approach, the study analyzes the lineages, surnames, and trends in hyangim and gyoyim recorded in Imsil-hyang-an and Imsil-cheong-geum-an. The findings suggest that five surnames, including Cheongju Han, Jeonju Yi, Hamyang Park, Hyeonpung Gwak, and Yeosan Song, dominated the registration of hyang-an from the 17th century to the early 18th century. However, this trend gradually eased in the mid-18th century to the late 19th century, with Cheongju Han and Jeonju Yi becoming more concentrated in the registration of cheong-geum-an. Other surnames attempted to be included in the dominant trend at a specific time, and this attempt became more pronounced in the 19th century, showing a similar registration rate to the previously dominant surnames. Furthermore, this study examines the trends in Hyangim and Gyoyim and shows that they were also concentrated on specific surnames such as Cheongju Han and Jeonju Yi. Cheongju Han is examined as a representative example of how they concentrated hyangim and gyoyim on their own ancestor to solidify their representation in the local society. In conclusion, although specific surnames dominated the registration of hyang-an and cheong-geum-an, and the trends in hyangim and gyoyim in the yangban society in Imsil, attempts were made to include other surnames in the dominant trend at specific times. Thus, while the yangban society in Imsil-hyeon maintained a trend of concentration on specific surnames in various aspects, there were also internal trends of change.