http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
홍만수(Mann Soo Hong),강석규(Seok-Kyu Kang),이지형(Jee-Hyong Lee) 한국지능시스템학회 2020 한국지능시스템학회논문지 Vol.30 No.6
연합학습은 데이터 보호를 위해 데이터를 클라이언트 단에서만 수집하고 활용한다. 클라이언트는 전체 데이터 분포에 대한 정보가 없으므로 노이즈, 비정상 데이터 등을 포함한 out-of-distribution(OOD) 데이터를 구분 없이 학습할 가능성이 있다. 본 논문은 OOD 데이터 학습으로 인한 글로벌 모델의 성능 저하를 줄이고자 한다. 서버에서 검증데이터를 이용해 softmax 벡터를 추출하여, softmax 벡터의 거리로 각 클라이언트 모델의 유사도를 계산한다. 글로벌 모델 업데이트 과정에서 유사도가 낮은 모델들을 배제함으로써 이상 클라이언트 제거를 통한 연합학습 모델의 성능향상을 제안한다. 이를 연합학습 모델에 적용하여 이미지를 분류하는 실험을 하였고 미적용 시보다 성능이 나아지는 것을 확인하였다. In federated learning, data is collected and utilized strictly on the client’s end for data protection. However, a client is ignorant to the overall distribution of the data. Hence, a client is open to a possibility to train on out-of-distribution(OOD) data, which includes noised data and abnormal data. This paper suggests a method to mitigate the negative effects of OOD data training on the performance of the global model. On the server, each client model input the validation dataset and output a softmax vector. Similarity was calculated by distance among the softmax vectors. Client models with low similarity were excluded when updating the global model. On image classification task, the exclusive method showed improved performance than the regular inclusive method.
지역난방-신재생에너지 하이브리드 열공급시스템 구축을 위한 열부하 및 열공급 분석
윤석만(Seok Mann Yoon),김진홍(Jin Hong Kim),김용기(Yong Ki Kim),민경천(Kyung Chon Min),이중용(Joongyong Yi) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
Recently, development of new and renewable energy technologies is becoming more important due to rising fossil fuel prices and conerns about environmental problems due to rising energy demand. In particular, when the heat generated from renewable energy sources is different from the thermal load, it should be operated so that heat storage or heat radiation operation can be performed smoothly. The purpose of this study is to calculate the system configuration and capacity through the heat load and heat supply analysis of the demand source in order to find a way to link the renewable energy hybrid heat supply system with district.
지역난방에 의한 공동주택의 개선된 최적예측제어에 대한 실험적 연구
홍성기(Seong-Ki Hong),이민환(Min-Whan Lee),조성환(Sung-Hwan Cho),윤석만(Seok-Mann Yoon) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.11
The objectives of this study are to find the optimal control method for apartment house with district heating system experimentally. An experimental facility consisting of small sized district heating system including heat exchangers and floor heating room have been built. The facility enables to compare the results of various control methods. This study have experimented about typical supply water temperature control method, outdoor reset control method and predictive optimal control method. Results show that 4.73% of optimal predictive control method were able to save heating energy more than Outdoor reset control method. And the predictive optimal control method have showed most effective method control.
Controlling the Charge Carrier Density of Black Phosphorus in a Rapid Plasma Doping Process
Dae-Kyoung Kim,Seok-Bo Hong,Mann-Ho Cho 한국진공학회(ASCT) 2020 Applied Science and Convergence Technology Vol.29 No.6
We investigated the control of the charge carrier density of black phosphorus (BP) 2D nanosheets in a rapid plasma doping process. The electronic structure of plasma boron-doped BP was investigated using X-ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy. The characteristics of a doped BP device were evaluated by fabricating a field-effect transistor under spatially controlled doping in BP nanosheets. The results confirmed the incorporation of ionized boron through the plasma doping process, resulting in the donation of strongly electron dope (electron mobility: ~275 ㎠/V·s) on the boron-doped BP switching device. In particular, the fabricated p–n homojunction of the BP device showed an excellent photodetection behavior. This work provides a rapid and stable plasma doping technique for two-dimensional nanosheets employed in next-generation electronic and optoelectronic devices.
SRF 열병합 발전배열을 연계한 지중계간축열 활용 효과에 관한 시뮬레이션 연구
조성규(Seong Gyu Cho),윤석만(Seok Mann Yoon),김진홍(Jin Hong Kim) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.11
Recently, the development of new and renewable energy technologies is becoming more important in Korea. Especially, the development of cooling and heating technology utilizing solar heat is actively underway. However, since solar heat is closely related to solar radiation, heat can be stored only during the daytime, which is disadvantageous in that heat supply is unstable. In this study, to solve the disadvantage of it in the solar thermal system, it is proposed that the exhaust heat of SRF(Solid Refuse Fuel) CHP(Combined Heat and Power Plant) is utilized instead solar thermal energy of a heat source. The BTES heat storaging pattern is simulated by the TRNSYS software. The study was compared with the case of DLSC. Simulation results show that the BTES is stable and reduced the storaging period compared to the DLSC case because SRF boiler is operated for 24 hours and can be continuously stored. In the future research, the various TRNSYS simulations will be conductedconsidering the heat charging and heat discharging of BTES, and how to use the BTES thermal storage below 60℃ in district heating.
Pulp Response of Mineral Trioxide Aggregate, Calcium Sulfate or Calcium Hydroxide
Yun, Young-Ran,Yang, In-Seok,Hwang, Yun-Chan,Hwang, In-Nam,Choi, Hong-Ran,Yoon, Suk-Ja,Kim, Sun-Hun,Oh, Won-Mann 대한치과보존학회 2007 Restorative Dentistry & Endodontics Vol.32 No.2
개의 치수에 MTA, calcium hydroxide 및 calcium sulfate로 치수복조 후 치수 반응을 서로 비교하여 MTA와 calcium sulfate가 임상적으로 치수복조제로서 사용 가능할 것인가를 구명하고자 본 연구를 시행하였다. 8개월 된 2마리 개의 24개의 치아가 본 연구에 사용되었다. 전신 마취하에 고속 핸드피스를 사용하여 멸균된 #2 round bur로 치경부에 와동을 형성한 후 치수를 노출시켰다. MTA, calcium hydroxide 및 calcium sulfate를 치수노출부에 도포하였다. 와동 부위는 IRM으로 가봉하고 광중합 레진으로 수복하였다. 처리 2개월 후, 전신 마취하에 희생시킨 후 조직학적으로 관찰하였다. MTA 처리군에서는 치수 노출부위에 경조직의 상아질교가 형성되었으며 새로 형성된 상아질교 하방에 조상아세포가 새로 형성되었다. 치수충혈과 함께 국소적인 혈관 증식이 나타났으며 치수에 염증반응은 나타나지 않았다. Calcium hydroxide로 처리한 군은 상아질교 하방에 조상아세포가 관찰되지 않았으며 만성염증반응이 다양하게 나타났다. Calcium sulfate로 처리한 군은 경조직의 상아질교가 관찰되었으며, 상아질교 하방에 조상아세포 층이 새로 관찰되었다. 몇몇의 중성구 침윤과 함께 미약한 정도의 만성염증반응이 관찰되었다. 이상의 결과에서 MTA가 calcium hydroxide 및 calcium sulfate에 비해 치수에 생체친화적임을 시사하며 기계적 치수노출시 치수복조제로 사용할 수 있음을 시사한다. This study was performed to verify the possibility of MTA and calcium sulfate as a pulp capping agent through comparing the dental pulp response in dogs after capping with MTA, calcium sulfate, and calcium hydroxide. 24 teeth of 2 dogs, 8 month old, were used in this study. Under general anesthesia, cervical cavities were prepared and pulp was exposed with sterilized #2 round bur in a high speed handpiece. MTA, calcium hydroxide, and calcium sulfate were applied on the exposed pulp. Then the coronal openings were sealed with IRM and light-cured composite. Two months after treatment, the animals were sacrificed. The extracted teeth were fixed in 10% neutral-buffered formalin solution and were decalcified in formic acid-sodium citrate. They were prepared for histological examination in the usual manner. The sections were stained with haematoxylin and eosin. In MTA group, a hard tissue bridges formation and newly formed odontoblasts layer was observed. There was no sign of pulp inflammatory reaction in pulp tissue. In calcium hydroxide group. there was no odontoblast layer below the dentin bridge. In pulpal tissue, chronic inflammatory reaction with variable intensity and extension occurred in all samples. In calcium sulfate group, newly formed odontoblast layer was observed below the bridge. Mild chronic inflammation with a few neutrophil infiltrations was observed on pulp tissue. These results suggest that MTA is more biocompatible on pulp tissue than calcium hydroxide or calcium sulfate.
지역난방에 의한 실제 공동주택에서 외기보상/예측제어의 적용에 대한 이론적 연구
이민환(Min-Hwan Lee),홍성기(Seong-Ki Hong),조성환(Sung-Hwan Cho),윤석만(Seok-Mann Yoon) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.11
In this study, the predictive control of outdoor temperature was considered for energy conservation in the district heating system. The simulation has been done in order to take look at the best control method for apartment by DHS(District Heating System). The program used in this simulation was TRNSYS 17 which was typical building-energy analysis program. The comparisons about energy consumption in general operation, outdoor reset control, and predictive control were checked in various ways with simulation. In simulation results, predictive control had the less energy consumption from 5.1% to 15.4% compared to conventional outdoor rest control, it would be good for the district heating system in the future.