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레미콘 회수수의 안정적 재활용을 위한 교반수조의 설비유형 효과
이문환,이세현,박영신,박재명 대한건축학회 2005 大韓建築學會論文集 : 構造系 Vol.21 No.2
Using the sludge water in producing ready mixed concrete, which is generated as washing surplus concrete after completing manufacturing and transportation of concrete is the best method in meeting the issue of cost of production and environment. However, in reality, using sludge water decreases Quality, and solid ingredients adhere to the transportation line of sludge water and the basin of sludge water, agitated to prevent precipitation of sludge, which incurs tremendous amount of repair expenses. In order to resolve the problems above, we have studied stable methods of supplying sludge water and experimentally reviewed the types of facilities. The result showed that a facility that added stabilizing agents which retarded hydration of unhydrated cement in sludge water for certain periods (2-3 days) and simultaneously agitated and moved by air diffusion and vertical flat blade impeller was most effective in stabilizing concentration of solid and preventing precipitation of solid in the bottom of basin. In addition, the performance of agitation and prevention of adherence of reaction basin of sludge water depended on selective efficiency of sand grain, and it has been studied that buffering inconsistent band of circulation of sludge water by operating the ring blower for air diffusion to the maximum was advantageous to preventing managing concentration and prevention of adherence.
HgCdTe 제작 다이오드 어레이의 열처리에 따른 전기적 특성
이정환,권순석,김명녕,이상래,황문구 大田産業大學校 2001 한밭대학교 논문집 Vol.18 No.-
This paper is investigated on the study of uniformity improvement and electrical characteristics for the 1×128 diode array used Hg^0.7Cd^0.3Te. The electrical characteristics were measured for the device manufactured by several different annealing processes and temperatures being discrepant from existing method of annealing processes and temperatures. The results of uniformity were improved from 60∼80[%], the rate of existing uniformity, to 99[%]. The results obtained from analyzing and examining the characteristics of current-voltage(I-V) and capacitance-voltage(C-V) are following. First, the reverse current show 6[㎁] or so. It is seemed to be resulted from the decrease of direct tunneling and trap tunneling of the device. Second, when the input bias voltage is zero, the maximum value of reverse resistance show 12[GΩ], and the mean value of reverse resistance show 5[GΩ]. Third, it is shown that the voltage of the maximum value of resistance is shifted 0.1[V] to the reverse direction.
김문모,이원환 연세대학교 산업기술연구소 1991 논문집 Vol.23 No.1
This is an experimental study on the local scour downstream of a head works. The investigation is carried out using geometrically similar models changing with weir height(4, 5, 7.5, 10cm), discharge per unit width(11.2, 22.4, 33.6, 44.7, 67.1, 89.4, 111.8lps) and lengths of apron (0, 0.5, 1.0, 2.0, 3.0m). As the result, the maximum depth of scour hole is proportion to the weir height and discharge per unit width, and inverse proportion to the lengths of apron. And experimental equations are presented for the maximum depth of scour.
신경회로망 자기동조 PID 제어기를 이용한 전력계통 안정화에 관한 연구
정형환,김상효,이정필,정문규 동아대학교 공과대학부설 생산기술연구소 1998 生産技術硏究所硏究論文集 Vol.3 No.2
This paper applied the neural network self-tuning PID controller to its linearized one-machine infinite bus for improvement in the power system stabilization. It ia tried to regulate the optimum parameters of the PID Controller using the learning algorithm of error back propagation. The simulation results show that the proposed control technique is decidedly superior to the conventional ones in dynamic responses about various disturbances arising in the power system.
전력시스템의 부하주파수 제어를 위한 IA-PID 제어기 특성에 관한 연구
정형환,김창현,이정필,정문규 동아대학교 정보기술연구소 2001 情報通信硏究所論文誌 Vol.9 No.1
In this paper, the robust PID controller using immune algorithm(IA) for load frequency control(LFC) is designed. In proposed method, objective function is represented as antigens. An affinity calculation is embedded within the algorithm for determining the promotion or suppression of antibody. Simulation results show that the proposed robust load frequency controller can achieve good performance even in the presence of generation rate constraints
大學 Elite選手들과 一般學生들의 情報化 實態에 關한 硏究
安文容,安孝爵,崔忠煥 한국체육대학교 학생생활연구소 1997 學生生活硏究 Vol.- No.3
The conclusion below shows how elite athletes in college met information through the mass media and computer usage. These results were obtained by surveying 100 elite athletes in college, 100 students in college of liberal arts and 100 students in college of science from university in Seoul. 1.It is T.V that elite athletes've used most frequently as an information sourtce, while newspaper's played an important role as an information source to students of college of liberal arts and science. 2.Many students(elite athletes 56%, students in college of liberal arts 40%, students in college of science 36%) have thought they've had insufficient informations. 3.They've mostly enjoyed reading spots section in newspaper and eagered for getting informations about self-development and qualification certificate. 4.There have been elite athletea(48%) who didn't read the newspaper and also students in college of science(12%) who didn't watch T.V. 5.They've enjoyed soap opera most of all and hardly watched cultural program 6.They(elite athletes 50%, students ill college of liberal arts 82%, students in college of science 84%) almost have personar computers but they've not read books regarding computer. 7.There were some elite athletes(34%) who didn't know at all how to use computer and they(57%) didn't use computers at all even once a day. 8.Almost of them(elite athletes 92%, students in college of liberal arts 75%, students in college of science 94%) have had beepers, but they've(elite athletes 77%. students in college of liberal arts 85%, students in college of science 86%) not had cellular phone let. And they've(elite athletes 38%, students in college of liberal arts 49%, students in college of science 44%) believe that Korea will be a full intelligence society after ten years.
汚加皮 抽出液이 마우스의 抗腫瘍 免疫反應에 미치는 影響
成載煥,權文鉉,金炯均 圓光大學校 韓醫學硏究所 1995 원광한의학 Vol.5 No.1
Ogapi(Acanthopanax senticosus) is being used for a tonic in the oriental medicine from ancient times, Even though it being used frequently for a tonic in the clinical medicine, basic study to make sure the mechanism of its action is the rare. Therefore, in this study, the author tried to know the effects of ogapi on the innate and specific immune systems in association with antitumor activity. The results obtained in this study are as follows: 1) Ogapi increased the phagocytic activities of murine peritoneal macrophages in vivo and in vitro. 2) Ogapi enhanced the production of such reactive oxygen intermediates as superoxide and hydrogen peroxide from the macrophages in vivo and in vitro. 3) Ogapi enhanced such humoral immune responses as hemagglutinin and hemolysin formations. 4) Administration of ogapi increased the number of rosette forming cells in the spleen. 5) Ogapi decreased the contact hypersensitivity against dinitrofluorobenzene. 6) Ogapi showed cytotoxic activity against human leukemia cell line (K562) 7) Ogapi increased the ratio of helper T cell versus suppressor T cell by increasing CD4^+ T cells and decreasing CD8^+ T cells. The above results show that ogapi increase the host antimicrobic and antitumor activities by the action on individual innate and specific immune systems in vitro. So this is considered as experimental results back up powerfully that ogapi can be used for a tonic in such a case when administered to a person lacking vital energy.
서중조건하에서의 콘크리트 충전 강관 기둥의 시공을 위한 실험적 연구
이장환,강용학,정근호,김진호,최문식,정상진 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
The basic Physical properties, Slump, Slump flow, Air content, Bleeding, and Settlement of concrete was investigated to test Characteristic of Setting and to evaluate the relation between Model specimen and Heat of hydration for construction Over the High Temperature(CFT). The objective of this study is to take the partial core after the cementation of Model specimen, test the compression intensity and analyze the relation to Test piece.
이문환,신형수 대한정형도수치료학회 2005 대한정형도수물리치료학회지 Vol.11 No.2
Lateral epicondylitis is characterized by pain at the lateral aspect of the elbow, commonly associated with resisted wrist or finger extension and gripping activities. Lateral epicondylitis is also known such as lateral epicondylosis, tennis elbow, or tendonitis of the wrist extensor muscles, especially extensor carpi radialis brevis. Lateral epicondylitis is a common musculoskeletal lesion in the clinical states, so physical therapist usually meet a patients who has the lateral epicondylitis. But many of physical therapists are treating patients based on a self know-how, so I want to describe a systematically about lateral epicondylitis and give a objective information on the lateral epicondylitis. And now I want that they will be treat patients with lateral epicondylitis not a self-experience but based on a objective information.
서문식,서용한,천명환 釜山大學校 經營 經濟 硏究所 1999 經營 經濟 硏究 Vol.18 No.2
본 연구는 크게 두 가지의 연구목적을 가지고 있는데, 하나는 지금까지의 관계마케팅 연구를 비판적으로 고찰하고, 이를 통해 기존연구의 한계점을 진단하고, 향후 연구과제를 제안한다. 둘째, 관계마케팅과 관련하여 서비스 분야에서 소홀하게 다루어졌던 서비스 제공자-고객간의 관계 단절과정에 대한 개념적 틀을 제안한다. 또한 관계단절의 개념적 틀에 포함되는 주요한 개념들에 대해 살펴보고, 개념들간의 관계에 대하여 몇 가지 연구명제를 제시하였다. 본 연구는 향후 서비스제공자-고객간의 관계단절을 연구하는 연구자들에게 연구방향을 제시하고 있다는 점에서 연구의 시사점을 찾을 수 있다.