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강성원 ( Kang Seong-won ),정찬유 ( Jeong Chan-yu ),김형국 ( Kim Hyeong-kuk ),이정윤 ( Lee Jung-yoon ),김길희 ( Kim Kil-hee ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.24 No.1
이 연구에서는 유공이 있는 철근콘크리트 보의 전단성능을 평가하였다. 실험은 유공 유무를 변수로 수행하였으며, FEM해석 프로그램인 ATENA 3D를 이용하여 실험결과와 비교하였다. 실험결과, 유공이 있는 실험체는 유공이 없는 실험체에 비하여 낮은 전단 내력을 나타내었으며, 해석결과는 유공 유무에 관계없이 실험결과를 매우 정확히 예측하였다.
하반신 마비환자를 위한 동력보행보조기의 퍼지제어 기법 개발
강성재(Sung Jae Kang),류제청(Jei Cheong Ryu),김규석(Gyu Suk Kim),김영호(Young Ho Kim),문무성(Mu Seong Mun) 제어로봇시스템학회 2009 제어·로봇·시스템학회 논문지 Vol.15 No.2
In this study, we wolud be developed the fuzzy controlled PGO that controlled the flexion and the extension of each PGO’S hip joint using the bio-signal and FSR sensor. The PGO driving system is to couple the right and left sides of the orthosis by specially designed hip joints and pelvic section. This driving system consists of the orthosis, sensor, control system. An air supply system of muscle is composed of an air compressor, 2-way solenoid valve (MAC, USA), accumulator, pressure sensor. Role of this system provide air muscle with the compressed air at hip joint constantly. According to output signal of EMG sensor and foot sensor, air muscles and assists the flexion of hip joint during PGO gait. As a results, the maximum hip flexion angles of RGO’s gait and PGO’s gait were about 16° and 57° respectively. The maximum angle of flexion/extention in hip joint of the patients during RGO’s gait are smaller than normal gait, because of the step length of them shoes a little bit. But maximum angle of flexion/extention in hip joint of the patients during PGO’s gait are larger than normal gait.
김권일(Kim, Kwon-il),이남규(Lee, Nam-kyu),성정용(Seong, Jeong-yong),강성귀(Kang, Seong-gwi) 호서사학회 2019 역사와 담론 Vol.0 No.89
최근 제철과 관련된 유구・유물의 조사 및 연구 자료를 토대로 전통제철 기술복원을 위한 실험이 실시되면서 전통적 방식에 의한 제철기술의 복원이 조금씩 진전되고 있다. 단야(鍛冶)는 제련에서 생산된 철괴를 대장간에서 가열하고 두드려 철기를 제작하는 비교적 단순한 공정으로 이해하여 온 측면이 있다. 하지만 발굴조사와 제철복원실험을 통해 단야공정은 제철에서 매우 중요한 공정임이 밝혀지게 되었다. 특히 경주 황성동・밀양 금곡 등의 제철유적에서 다양한 구조의 단야로가 조사됨에 따라 단야공정은 정련단야-단련단야-성형단야 등 여러 공정으로 세분될 수 있다는 점이 확인되었다. 이에 따라 단야로 역시 다양한 크기와 구조로 복원될 수 있고, 각 공정에 수반되는 단야기술도 서로 다른 유형일 가능성이 높음을 알 수 있게 되었다. 이러한 검토를 통해 다양한 단야로의 구조 복원과 구체적인 조업방식을 상정한 단야복원실험이 가능하게 되었다. 본고에서는 2차례에 걸친 단야실험의 내용을 토대로 고대 제철의 단야공정에 대해 고찰하였다. 단야의 공정을 정련단야-단련단야-성형단야 세 가지로 상정하고 각 공정에 해당되는 노의 구조를 복원하였으며, 각 공정에서는 철괴-철정-철기가 생산되는 것으로 기획하였다. 단야의 소재로는 제련실험에서 생산된 잡철을 이용하였고, 연료로는 참나무 백탄을 사용하였다. 철광석 분말을 탈탄제로 활용해 소재에 남아 있는 탄소의 제거를 도모하였다. 실험결과, 정련단야에서는 압착된 부정형 판상의 철괴를, 단련단야에서는 판상 혹은 봉상의 철정을, 성형단야에서는 낫・창 등의 완성된 단조철기를 제작할 수 있었다. 이러한 일괄공정은 조선후기 민속자료에서 수집된 내용과 거의 일치하기 때문에, 전통적 방법의 단조철기 생산체계가 하나의 일관된 구조를 지니고 있음을 알 수 있게 되었다. 한편 도검 등 강철기의 제작과 선철을 사용한 용해기술의 복원은 향후의 또 다른 과제이다. This paper organized the concepts about the process of big smithies for ancient iron-making(purifying-smithing and tempering-smithing) that have been rarely discussed, and reviewed the applicable furnaces among the iron-making furnaces researched in the archeological sites. In addition, the study restored the structure of purifying-smithing furnaces based on the furnace No. 2-2 in the remains in 537-2 Hwangseong-dong, Gyeongju and the furnace No. C-27 in the Geumgok iron-making site in Milyang, and the structure of tempering-smithing furnaces based on the furnaces of No. B-2 and 11 in Geumgok, Milyang, which all remain in a relatively good condition. The purifying-smithing furnace was in the semi-underground type with an oval or obtuse-angled square shaped floor plan and got narrower upwardly. The furnace had small diameter blastpipes symmetrically on each side to provide strong wind, and small board hand-bellows were assumed. However, there were differences between the furnaces in two historic sites. While the tapping hole and smithing workplace were installed and iron slag with high iron content was deposited on the furnace wall in one site, such facilities were not installed and little iron was contained in iron slag in the other site. The differences were interpreted as the distinctions in the operation methods depending on the materials. It was inferred that the first was based on the material of miscellaneous iron of low carbon bloomery iron and the latter is based on the material of high carbon pig iron or combined iron of pig iron and bloomery iron. Tempering-smithing furnace was in the semi-ground type where more than a half of the body of the furnace was installed on the ground with a circular floor plan. The furnace was restored in the structure that went upward slightly widely in the bottom part, which was comprised of walls of the pit under the furnace, and went up straightly from the middle part. It featured small gravels which were spread on the surface of the floor of the furnace. Since a significant amount of iron was deposited on the gravel side on the surface of the floor of such furnace, which was identified in the Imcheon-ri site in Milyang, it had a decisive impact on deciding whether the furnace had the tempering-smithing function.
고추장굴비의 품질과 저장성에 미치는 초고압처리와 감마선 조사 효과
강성국 ( Seong Gook Kang ),박난희 ( Nan Hee Park ),고두옥 ( Do Ock Ko ),이정뢰 ( Jing Lei Li ),김보섭 ( Bo Sub Kim ),박양균 ( Yang Kyun Park ) 한국식품저장유통학회(구 한국농산물저장유통학회) 2011 한국식품저장유통학회지 Vol.18 No.1
Kochujang-gulbi, a Korean traditional food, was prepared with kochujang and freeze-dried gulbi slices. Kochujang-gulbi was treated with high hydrostatic pressure (200, 400 and 600 MPa) and gamma-irradiation (7, 10, 20 and 30 KGy) to improve its quality and shelf-life. The pH of high hydrostatic pressure and gamma-irradiation treated kochujang-gulbi samples did not significantly different compared to that of control. However, Hunter L value slightly increased, and Hunter a and b values decreased by high hydrostatic pressure and gamma-irradiation treatment. During storage, the pH and color of high hydrostatic pressure and gamma-irradiation treated kochujang-gulbi samples did not significantly changed. The VBN and TBA level decreased by the increase treatment of high hydrostatic pressure and then slowely increased during storage. The VBN and TBA level of kochujang-gulbi samples treated by the strong gamma ray emmission slowely increased during storage. In particular, gamma-irradiation treatment was very effective to sterilize microorganisms when compared to that of high hydrostatic pressure in kochujang-gulbi products. In addition, the high hydrostatic pressure and gamma-irradiation treated kochujang-gulbi samples shown significantly lower total viable cell number than control for the 20 days of storage at room temperature with retort pouch packaging.
프러시안블루의 LBL(Layer-by-Layer) 합성법에 의한 알지네이트 비드형 흡착제의 세슘 흡착 특성연구
김복성(Bok Seong Kim),강성원(Sung Won Kang) 대한환경공학회 2021 대한환경공학회지 Vol.43 No.12
목적: 원전사고나 방사능 폐기물 유출에 의한 방사성 오염물질의 수계 확산시 수중 세슘(Cs)을 선택적으로 흡착할 수 있는 비드형 흡착제를 개발하고자 하였다. 방법: 알지네이트를 지지체로 하고 PB를 고정화한 PA(prussian blue-Alginate bead) 비드와 PB를 다중고정화 방식인 Layer-by-Layer (LBL) 합성법으로 PB를 고정화된 PAL (Prussian blue-Alginate bead with LBL synthesis) 비드를 개발하였다. 결과 및 토의 : SEM (EDS) 및 TG 분석을 통해 LBL 합성법이 적용된 PAL 비드가 PA 비드와 비교하여 PB 함량이 6.31% 향상된 것을 확인하였다. 개발 흡착제의 세슘 흡착성능을 평가하였는데, PA 비드의 최대흡착량(qm)이 25.783 ㎎/g이었고 PAL 비드는 28.294 ㎎/g으로 확인되어 LBL 합성방법에 의해 Cs 흡착능이 향상된 것을 확인하였다. 또한 흡착제의 안정성을 판단하기 위해 PA 비드 및 PAL 비드의 합성 이후 세척수를 UV-vis 분석한 결과, PAL 비드의 PB 탈착이 더 낮게 나타나 LBL 합성으로 안정성도 향상된 것을 확인하였다. 결론: 본 연구에서는 수중에 존재하는 Cs을 선택적으로 흡착하기 위한 흡착제를 개발하기 위해 알지네이트 비드 내 PB를 화학적으로 고정화한 흡착제를 개발하였다. PB 고정화는 LBL 합성법을 적용하여 진행하였고 최종적으로 PAL 비드의 최대흡착량(qm)은 28.294 ㎎/g으로 나타나 방사성 세슘 오염수에 효과적이고 안정적으로 적용될 수 있을 것으로 기대된다. Objectives : The purpose of this study was to develop an adsorbent to which Prussian blue (PB) is stably immobilized to remove radioactive cesium (Cs). Methods : Prussian blue-Alginate (PA) bead and Prussian blue-Alginate with Layer-by-layer synthesis (PAL) bead were synthesized by immobilizing PB respectively. Results and Discussion : As a results of XRD and FT-IR analysis, PB was successfuuly immobilized in alginate bead and PA, PAL bead. SEM (EDS) and TG analysis data were confirmed that the PB content of the PAL bead to which the LBL synthesis method was applied was improved by 6.31%. It was confirmed that the Cs adsorption capacity was improved through the LBL assembly process. The maximum adsorption amount (qm) of PA bead was 25.783 ㎎/g, and PAL bead was ㎎/g. In addition, as a result of UV-vis analysis of washing water after synthesis of PA bead and PAL bead, it was confirmed that the PB desorption of the PAL bead was lower indicating that the stability was also improved by LBL synthesis. Conclusions : We developed an adsorbent which prussianblue immobilized on alginate bead for selective removal cesium in aqueous solution. PB was immobilized by LBL synthesis method qm of PAL beads was 28.294 ㎎/g. It was expected to applied effectively and stably to radioactive cesium contaminated water.