발치 ( 拔齒 ) 로 인한 파상풍의 1예 보고

김주환,김종배,고진수,김신규 ( Ju Whan Kim,Jong Bai Kim,Jin Soo Kauh,Shin Kyu Kim ) 대한예방치과·구강보건학회 1967 大韓口腔保健學會誌 Vol.1 No.2

정수장 전염소 공정제어를 위한 침전지 잔류염소농도 예측 머신러닝 모형

김주환,이경혁,김수전,김경훈,Kim, Juhwan,Lee, Kyunghyuk,Kim, Soojun,Kim, Kyunghun 한국 수자원 학회 2022 한국수자원학회논문집 Vol.55 No.-

본 연구는 정수장의 수처리 공정에서 계측되고 있는 수량 및 수질데이터의 활용과 수처리 공정제어의 지능화를 위한 것으로 정수장에서 전염소 공정이 수반되는 처리공정에서 침전지 유출수 잔류염소농도 안정화를 위하여 이를 추정할 수 있는 모형을 구축하고자 하였다. 정수장 침전지 유출수의 잔류염소농도를 예측하기 위하여 중회귀모형과 인공지능 알고리즘 중 다층퍼셉트론 신경망, 랜덤포레스트 및 장단기기억(Long Short Term Memory; LSTM) 모형을 활용하였고 그 결과를 비교, 평가하였다. 모형의 입력변수로는 전염소 공정이 도입된 정수장에서의 잔류염소농도, 수온, 탁도, pH, 전기전도도, 유량, 알칼리도 등이 사용되었고 전염소에 따른 침전지의 안정적 운영을 위해 요구되는 침전지 잔류염소농도를 출력변수로 구성하였다. 적용 결과에서는 랜덤포레스트 모형이 가장 양호한 결과를 보여 주었으며 다음으로 LSTM, 다층퍼셈트론 신경망 순으로 나타났다. 수학적 모형인 중회귀모형은 적합도 측면에서 가장 낮은 결과를 보여 주었는데, 이는 수량과 수질데이터의 수치적인 규모나 차원의 차이뿐만 아니라 계절별 수질특성에 따라 염소소비 특성이 매우 다양하게 반응하기 때문으로 판단된다. 따라서 정수장 수처리 공정에서 인공지능 알고리즘의 적용을 위해서는 랜덤포레스트와 같이 의사결정 트리구조의 도입과 적용이 타당한 것으로 나타났다. 본 연구에서 분석된 결과를 근거로 전염소 공정이 도입된 정수장 수처리 공정에서 염소주입량을 실시간으로 예측 가능하게 함으로써 침전지 유출수에서 잔류염소농도를 일정하게 유지하는데 기여할 수 있을 것으로 기대된다. The purpose of this study is to predict residual chlorine in order to maintain stable residual chlorine concentration in sedimentation basin by using artificial intelligence algorithms in water treatment process employing pre-chlorination. Available water quantity and quality data are collected and analyzed statistically to apply into mathematical multiple regression and artificial intelligence models including multi-layer perceptron neural network, random forest, long short term memory (LSTM) algorithms. Water temperature, turbidity, pH, conductivity, flow rate, alkalinity and pre-chlorination dosage data are used as the input parameters to develop prediction models. As results, it is presented that the random forest algorithm shows the most moderate prediction result among four cases, which are long short term memory, multi-layer perceptron, multiple regression including random forest. Especially, it is result that the multiple regression model can not represent the residual chlorine with the input parameters which varies independently with seasonal change, numerical scale and dimension difference between quantity and quality. For this reason, random forest model is more appropriate for predict water qualities than other algorithms, which is classified into decision tree type algorithm. Also, it is expected that real time prediction by artificial intelligence models can play role of the stable operation of residual chlorine in water treatment plant including pre-chlorination process.

활동중심 국어과 수업의 성과와 한계 ―설명문 쓰기 수업을 중심으로

김주환 ( Kim Joohwan ) 국어교육학회 2017 국어교육학연구 Vol.52 No.2

This study examined achievements and limitations of the activity-centered Korean language instruction focusing on Ms. Kim`s expository writing lessons in the free semester. Through Ms. Kim`s class, students were able to acquire various knowledge of topic subjects and practical knowledge for expository writing. Therefore, activity-centered instruction is a teaching and learning method that is matching for the goal of Korean language arts. However, Ms. Kim`s lessons had limitations in achieving learning goals. The gap between learning goals and actual student-activities was prominent, and topic contents was higher rather than writing strategies. The guidance on writing results was higher rather than writing processes. And the connectivity among activities was found to be insufficient. It is necessary to increase the closeness between the learning goals and the student activities, and balance student and teacher activities.

하악전치하방 ( 下顎前齒下方 ) 에 발생한 cementifying - fibroma의 1예보고

김주환,김종열,김창현 ( Ju Whan Kim,Chong Youl Kim,Chang Hyun Kim ) 대한예방치과·구강보건학회 1967 大韓口腔保健學會誌 Vol.1 No.2

중소병원의 우수인력 확보방안

김주환,Kim, Ju-Hwan 대한병원협회 1988 대한병원협회지 Vol.17 No.10

점탄성 유체의 용융방사공정의 동특성 1 . 정상상태의 방사사선의 거동

김주환,김병민,이상헌,유병규,현재천 ( Joo Hwan Kim,Byung Min Kim,Sang Heon Lee,Byung Kyu Yoo,Jae Chun Hyun ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.5

Dynamic characteristics of melt spinning, the most important process in synthetic fibers manufacturing, has been investigated by conducting a simulation. The governing equations of one-dimensional model comprising the continuity equation, the equation of motion, the energy equation, and the constitutive equation of the materials, have been solved for different material constants and different operating conditions to find out the effect of the industrially important operating variables on the spinline dynamics. This kind of prediction through a simulation provides valuable information to the productivity improvement of melt spinning, i.e., process stability and product quality. Specifically, in this study we evaluated how the spinning process is influenced by the characteristics of viscoelastic fluids and the operating conditions such as spinning velocity, cooling conditions, spinning distance, and so forth.

지리교육과의 특색과 발전방향

김주환,Kim, Ju-Hwan 한국대학교육협의회 1992 大學敎育 Vol.58 No.-

Glutamine 함유 배양액에 첨가한 에너지원이 마우스의 배 발달에 미치는 영향

김주환,박기상,이택후,전상식,송해범,Kim, Ju-Hwan,Park, Kee-Sang,Lee, Taek-Hoo,Chun, Sang-Sik,Song, Hai-Bum 대한생식의학회 2000 Clinical and Experimental Reproductive Medicine Vol.27 No.1

Objective: Mammalian embryos undergo changes of energy environment for transfer from oviduct to uterus. Also, the human reproductive organ (oviduct, uterus) contains energy sources of different concentration (oviduct - glucose: 0.5 mM, pyruvate: 0.32 mM, lactate: 10.5 mM; uterus - goucose: 3.15 mM, pyruvate: 0.1mM, lactate: 5.87 mM, respectively). This study was conducted to examine the effect of these energy sources added in DMEM with glutamine on the mouse embryo development. Methods: There was used ICR female mouse. Two cell embryos of mouse are collected by method of 'flushing'. Flushing fluid was used Ham's F-10 added to 20% FBS. The collected 2 cell embryos were cultured in media such as Control (only DMEM), group A and B (DMEM supplemented with 0.5 mM and 3.15 mM glucose), and group C and D (DMEM supplemented with 0.1 mM and 0.32 mM pyruvate), and group E and F (DMEM supplemented with 5.87 mM and 10.5 mM lactate). All experimental media supplemented with 20% hFF, respectively. Pattern of embryo development was observed to interval at 24hr during 96hr. Results : The media with glutamine added glucose (group A: 51.0%; group B: 48.4%) was significantly (p<0.05) higher than other experimental group in development into the morula stage after 24 hr in culture, but not significantly different compared with control and the rate of development into the blastocyst was significantly (p<0.05) low in the both of pyruvate (group C: 7.9% group D: 6.8%) and lactate (group E: 7.1%, group F: 7.1%) treatment group after 48 hr in culture. Development into the blastocyst and hatched balstocyst after 72 hr in culture revealed similarly in control (81.9%) and glucose treatment group (group A: 83.3%, group B: 82.8%). However, development into the hatched and attached blastocyst after 96hr in culture revealed significantly (p<0.05) development in the glucose treatment group (group A: 82.3%, group B: 78.5%) than control (63.2%), and its of pyruvate (group C: 34.1%, group D: 34.1%) and lactate (group E: 25.9%, group F: 33.3%) treatment group were significantly (p<0.05) lower than control similar to previous observations. Conclusion : The glucose added to the DMEM with only glutamine, as energy source, was highly to the rate of development compared with control, but the other energy sources were not, synthetically. Above refer to, the human reproductive organ (oviduct, uterus) contains energy sources of different concentration. Thus, further studies are will examine continuously to effects by interaction of different energy sources in the mouse embryo development, and these results will provide to foundation on the human embryo culture.

지역 공동체 네트워크 시급하다

김주환,Kim, Ju-Hwan 한국도서관협회 1996 圖協會報 Vol.37 No.3

한탄강(漢灘江) 일대(一帶)의 지표기복(地表起伏)에 관한 정보(情報)

김주환,Kim, Joo-Hwan 한국동굴학회 2006 동굴 Vol.72 No.-

The purpose of this study is to clarified the geology and geomorphic characteristics of the Hantan River Basin. In this area, some kind of landforms are developed such as pre-land forms, lava plateau, and present landforms etc. Some river terraces are peculiar features in the area. Some conclusions are as follows : The vicinity of the Hantan River is lava plateau formed from the volcanic activity. Some steptoes are located in the lava plateau. Baekeuiri formation means the river bed boulder beneath the lava formation. The development of drainage patterns are unstable and the bifurcation ratio, the ratio of mean length of the river are lower than the other rivers. The relative height of the terraces is about $5{\sim}25m$ and the terraces are alluvial terraces. In the Jiktang Fall area, bedrock is granite and basalt plateau covered the bedrock. In that point, the old erosion surface is relatively steeper than the horizontal-basalt plateau. Vertical columnar joints are developed and weathering materials creep on the valley wall. The cross section of the landform of the Kosukjung vicinities are somewhat different from the landforms of Jiktang Fall. The bedrock near the Kosukjung is granite that is the same with the Jiktang Fall. But the cross section shows a asymmetrical curve from each side.