반응기 혼합법에 의한 폴리올레핀/2D-나노시트 나노복합체 제조; 에틸렌-프로필렌 공중합체

문영권(Young Kown Moon),이동은(Dong Eun Lee),윤근병(Keun-Byoung Yoon) 한국고분자학회 2020 폴리머 Vol.44 No.5

Ethylene-propylene copolymer (EP)/modified reduced graphene oxide (rGO) composites were fabricated via reactor mixing method under mild conditions using Et(Ind)₂ZrCl₂ activated with methylauminoxane (MAO). Microstructure, mechanical and thermal properties of composites are presented. The rGO nanosheets were homogeneously dispersed in EP matrix and the interfacial adhesion with EP was excellent by the modifying the rGO. Although the thermal stability of the aforementioned composites was relatively unchanged when compared to copolymer, significant enhancements in the mechanical properties were observed (e.g., up to 40% increase in the tensile strength and 50% increase Young’s modulus for composites containing 5.0 wt% rGO). Thus, this reactor mixing provides a method for production of high performance polyolefins.

龍平 Ski場의 觀光客이 地域經濟에 미치는 影響

朴榮完,金炳文 관동대학교 1983 關大論文集 Vol.11 No.2

Kang Weon Province is a treasure house for tourists. There is not only a ski resort area, but there are resources for tourism year round-Spring, Summer, and antumn. As Korea has developed economically, tourism has also changed. The customary, more "active" and "varied forms of recreation, such as golf, skiing, Swimming, climbing, hiking, camping, and fishing. The is true especially for younger toursits. Since the young peung ski resort area is the only skiing region in Korea, skiers are attracted to the area from all over the country. Ninety Percent of skiers come from Seoul, and 10% from others regions. There are two ways to find out about attractive tourist areas. One way is from residencs which live near tourist sights, and the other way is from tourist resources about the tourist area. The young peung Ski resort area is 160KM from young peung tourist resources. The number of skiers exceeds the present accommodations for them. The tourist pattern in the ski region shows two peaks and two lows. Winter is the first peak and the second is fall. The high in the summer is due to tourists going to the East Sea bathing resorts. The first peak in winter accounts for 30% of all tourists in the country at that time, and 95% of all domestic tourists, including foreginers who live in Korea. There are many other tourist resources near the ski area. There are the famous beaches near Kangreung, and Oa Dea National Park. The youngPeung region is one spot on the tourist route in this Area. Skiing on young peoung has had little effect on regional economics as there are few lodginghouse or other accomodations. Becassuse skiing is popular and is a rapidly growing industry with many amature skiers, it would seem that other areas should be developed for skiing.

멀리뛰기의 운동역학적 연구경향

문병용 江原大學校附設 體育科學硏究所 1990 江原大學校附設體育科學硏究所論文集 Vol.- No.15

The purpose of this study is to infer the tendencies and results of researches on the basis of the precent researches on running long jump, and to provide the leaders and players with the tendencies of biomechanical researches on such four skill structures as approach, take off, airborn movement and landing. The results are follings ; 1. It is useful to put on the 90%-95% of player's maximum speed at 40m-50m distance, in approach. 2. It is effective to keep the progressive speed and the angle of 20 -30, in take off. 3. It should be well done to co-operate between arms and legs, in airborn movement. 4. It is effective to land with raising legs like the shape of 7, in landing.

미국의 초ㆍ중등학교에서의 레크리에이션의 활용에 대한 조사연구

문병용 강원대학교 체육과학연구소 2001 江原大學校附設體育科學硏究所論文集 Vol.- No.24

A school recreation activity is essential for revitalizaing school life which students are willing to join as long as they can. I hope my paper that examines how the USA practices a school recreation activity can serve to improve a situation of Korean education which is getting devastated and becoming like a personal institution. The school recreation activity in the USA is practical differently from that of Korea in a kindergarten, an elementary and middle school. The major role of a recreation activity in kindergarten and elementary school is focused on various recreational events to motivate students to take part in a class spontaneously. In middle school, after finishing all the class around 3 o'clock students usually participate in a school recreation activity which is mostly consistent with their hobbies. This activity is essential to prepare their social life as society members. The school recreation activity of school is USA is practiced positively because of the following reasons: 1.It is more interesting than the previous traditional way of lesson. 2.Students realize more faces and principles than through various recreational activities than ever. 3.Student acquire more critical thoughts and communication skills. 4.Students' attitude changes remarkably because they learn to share with friends. 5.A school recreation activity is really useful for students to be interested in a school life.

Heterosigma akashiwo의 psbA 유전자 구조 특성

문병용,이진하,김상해 인제대학교기초과학연구소 1999 자연과학 Vol.3 No.-

Heterosigma akashiwo로부터 광합성에 중요한 psbA 유전자를 찾고 그 구조를 분석하였다. H.akashiwo에서 전체 DNA를 추출하고 psbA유전자에 특이적인 primer들을 사용하여 PCR로 증폭시켰다. 증폭된 약 1.2kb 크기의 DNA를 pGEM-3Z vector에 클로닝시키고 염기서열을 결정하여 유전자 구조를 조사하였다. 결과, 360개의 아미노산으로 구성된 D1단백질의 암호 지역과 원핵생물의 특징적인 promoter 구조 그리고 ribosome 결합자리를 확인하였으며 D1 단백질의 카르복시 말단 부위에는 엽록소 b를 포함하지 않은 cyanobacteria처럼 특징적인 7개 아미노산이 첨가된 특징을 알 수 있었다. 다른 광합성 생물들의 psbA 유전자와 비교하였을 때 고등식물과는 DNA 염기서열에서 83.3%, 아미노산 서열은 91%의 유사성을 보였으며, cyanobacteria와는 DNA 염기서열은 75.2%, 아미노산 서열은 82%의 유사성을 보였다. 또한 psbA mRNA의 5'-말단 부위에는 번역과정의 조절 부위로 작용할 수 있는 이차구조를 확인하였다. The psbA gene was isolated from Heterosigma akashiwo and its structure was characterized. The psbA gene of about 1.2kb size was amplified from genomic DNA of H. akashiwo by PCR and the nucleotide sequences were determined. A coding region for D1 protein containing 360 amino acids, a promoter element like prokaryotic promoter, and ribosome binding site exist in psbA gene of H. akashiwo. There was addition of the motif consisting of seven amino acids at carboxy terminus region like in cyanobacteria. As the nucleotide and amino acid sequences of H.akashiwo psbA gene were compared with those of higher plant, Spinacia and cyanobacteria, homologies in nucleotide and amino acid sequences between H.akashiwo and Spinacia were 83.3% and 91%, respectively. Those between H.akashiwo and cyanobacteria were 75.2% and 82%, respectively. A secondary structure being act as cis-acting element in translational regulation of psbA gene was showed at 5'-terminus of mRNA.

運動 類型別 心臟의 形態 및 機能에 關한 硏究

문병용 江原大學校附設體育科學硏究所 1997 江原大學校附設體育科學硏究所論文集 Vol.- No.21

The purpose of this study is to analyze the function of heart - at rest and just after the maximun exercise - with various exercise types. The subjects of this study are 10 people as untrained group, 10 weight lift players, 10 field hockey players, 10 marathon field hockey players. Echo cardiography is used to analyze the function of heart and to observe heart section at 50mm speed secandly. The result of study is as follows ; 1. In the Left Ventricular internal diameter, when diastolic, a marathon group shows the largest index, 3.25±0.10, next a hockey player group, 2.95±0.14, systolic, a marathon group shows the largest index, 2.10±0.20 at rest When exercise, diastolic, a marathon group shows the largest index, 3.36±0.31, 1.86±0.20 in each case. 2. In the Left Ventricular Septal Well thickness, when rest diastolic, marathon group shows the largest index, 0.59±0.03, 0.58±0.05, General Group Shows the next index, 0.52±0.02, When, rest systolic, marathon group shows the largest index 1.00±0.06. When exercise diastolic and systolic, maraton group shows the largest index. 3. In the left Ventricular Posterior Wall thickness in the index, a marathon player group shows the largest, 0.66±0.02 at rest and diastolic. 4. In the Left Ventricular Volume, when diastolic, a Hockey player group shows the largest 82.01±11.56 at rest. When systolic, also a Hockey player group shows the largest. When diastolic and systolic, a marathon player group shows the largest at exercise. 5. In the Left Ventrical mass, a marathon player group shows the heaviest, 141.53±26.85 at rest and 143.35±27.52 maximun exercixe. 6. In the cardiac output at rest, a maraton player group shows the most, 3.01±0.74; When exercise, highschool maraton player shows the most, 6.83±3.59

초등학교 고학년 학생의 구강보건에 관한 인식 및 행동

김영경,문혁수,정재연,한수진,이병진,김은경,정혜련 韓國學校保健學會 2001 韓國學校保健學會誌 Vol.14 No.1

The purpose of this study was to collect basic data for the development of effective oral health education program in elementary school. The subjects in this study were 604 fourth-year, fifth-year and sixth-year students of an elementary school in Seoul. Oral health awareness and behaviors were surveyed and analyzed. The findings of this study were as follows: 1. The most common time for toothbrushing was after dinner(62.0%) and before bedtime(62.3%). By school year, the largest number who brushed their teeth after dinner were fourth and fifth graders while the greatest number who did so after breakfast were sixth graders Seventy-four percent of respondents brushed the teeth twice or more a day. By school year, the fifth-year students brushed their teeth the least while girls outperformed the boys in daily toothbrushing frequency(p<0.05). Regarding the intake of cariogenic food, 62.1% took that kind of food once or more a day. By school year, the fifth graders took the most (p<0.05), and girls took more cariogenic food than the boys(p<0.05). 2. Ninety percent of the respondents had visited a dental clinic. By grade, the sixth-year students had visited a dental clinic more frequently and girls more frequently than boys. Eighty percent of the respondents visited a dental clinic to receive treatment but just 12.3% visited a dental clinic to prevent oral diseases. Concerning the fetor of dental treatment only 14.4% expressed fear. School year made no difference, yet the percentage of girls who experienced fear was higher than that of boys(P<0.05). Regarding preventive treatment, 39.7% experienced pit and fissure sealing and 24.2% experienced the application of fluorides. All the students hadn't much experience in preventive treatment regardless of school year -- gender didn't make a difference. 3. Fourty-six percent of respondents had a preference for the fluoride mouth rinsing program; 38.4% wanted that grogram to continue. As to the reason for preference, 38.2% preferred it because of the prevention of dental caries, 43.0%, the largest percentage, didn't favor it because they found it too much trouble to do(some of the respondents gave two different answers). 4. Despite an increase in the frequency of toothbrushing at the right time, they still took cariogenic food frequently Their visit to a dental clinics also aimed at treatment more than at prevention, and they had very narrow experience of preventive treatment. Furthermore, the fluoride mouth rinsing program failed to draw their interest. Therefore, it is recommended that a successful real health education program should be developed.

局部挫屈 및 彈塑性擧動을 考慮한 空間트러스의 幾何學的인 非線形 有限要素解析

김문영,민병철 成均館大學校 科學技術硏究所 1993 論文集 Vol.44 No.2

本 硏究에서는 空間트러스 構造의 幾何學的 非線形 및 材料非線形 擧動을 解析하기 위한 有限要素法을 提示한다. 이를 위하여, 트러스部材, 大變形, 部材 局部挫屈 그리고 彈塑性擧動을 考慮하는 彈性 및 幾何學的인 剛度매트릭스를 誘導하고, 不平衡荷重 算定方法을 取扱한다. 또한 트러스 構造의 極限擧動解析, 後挫屈解析을 수행하기 위하여 變位 및 荷重 增分法을 適用한다. 局部挫屈, 彈塑性 擧動을 보이는 트러스 構造를 解析하여 文獻의 결과와 比較 檢討 함으로써 提示된 理論의 妥當性을 檢證한다. A simple and useful expression for the tangent stiffness matrix of a truss undergoing arbitrary large deformation, member local buckling and elastoplastic behavior is given. In elastoplastic analysis, the isotropic and kinematic hardening models are applied. An load/displacement incremental algorithm is used to solve the incremental equilibrium equations in the post-buckling range of the truss structure. Numerical examples to illustrate the validity of the present approach in analyzing truss structures. efficiently and accurately, are given and discussed.

變形된 쉘 要素를 이용한 板 및 쉘構造의 彈塑性 挫屈解析

김문영,민병철 成均館大學校 科學技術硏究所 1994 論文集 Vol.45 No.2

For the post-buckling and elasto-plastic analysis of plates and shells, the total Lagrangian formulation based upon the degenerated shell element is presented. In the calculation of the tangent stiffness matrix of the shell element, shear deformation effects due to shear forces and elastoplastic behaviors are considered and the selective or reduced integration scheme with an attempt to overcome shear locking phenomena is applied. For geometric non-linear analysis including bifurcation branching points, snap-through and turning-back behaviors, the automatic load/displacement incremental method is adopted. Based on such methodology and algorithm the computer program which can trace post-buckling and elastoplastic behaviors is developed and numerical examples for non-linear behaviors of plates and shells are presented.

하천수중 화학적산소요구량 및 유기성탄소의 경시적 변화에 관한 연구

박병윤,양소영,이부용,장상문 대구효성가톨릭대학교 1998 연구논문집 Vol.57 No.2

In order to provide the basic information for the water quality of urban streams and the quality variation of these streams, the water pollution indicators of Sin stream and Keumho river flowing through Taegu city were measured, and the variations of COD and OC of stream waters and artifical samples were studied under the condition of stagnation. For this experiment, two sampling sites(Sungpook bridge, Mutae bridge) were selected. Sungpook bridge is located most down the Sin stream, Mutae bridge is located on the lower keumho river. Artificial samples were prepared with mixing starch and CaCl?, and the pHs of these samples were adjusted by adding NaOH and HCl. The results were as follows. 1. The DO values of stream waters sampled in June and July were much lower than those of stream waters sampled in March and April. 2. The COD values of all the samples highly exceeded the fifth grade of environmental criterion(10mg/?) 3. EC highly correlated with ALK and Cl anion. 4. The COD values of stream waters sampled in June and July and stagnated under the laboratory temperature distinctly decreased in process of stagnation, and those of stream waters sampled in April and stagnated in the incubator(20℃) also distinctly decreased. But, the COD variations of stream waters sampled in March and April and stgnated under the laboratory temperature didn't show a distinct tendency. 5. The contents of OC in stream waters sampled in March and April and stagnated under the laboratory temperature distinctly decreased in process of stagnation, and those of stream waters sampled in April and stagnated in the incubator(20℃) also distinctly decreased. But, the contents of OC in stream waters stagnated under the incubator temperature, which was higher than the laboratory temperature, more rapidly decreased in process of stagnation.