長方形 容器內에서 磁性流體의 流動特性에 관한 硏究

문종춘,조광현,서이수 동아대학교 공과대학 부설 한국자원개발연구소 1992 硏究報告 Vol.16 No.1

The present paper describes sloshing phenomena of the magnetic fluid flow in rectangular tank which is horizontally oscillated under non-uniform magnetic fields. In theoretical analysis, the desision of potential function obtained by assuming that linear to be non-linear boundary condition. The obtained results from experiment and theoretical analysis are as follows : The resonant frequency of fluid and magentic fluid based on a potential theory are in good agreement qualitatively with that of experimental results. It is found that resonant frequency depends on the magnetic intensity and moves into high frequency region. Pressure and velocity increase by non-linear with increasing wave heights and linearly increase with increasing magneitc force.

Pictorial Letters에 關한 硏究

趙武光 新羅大學校 1985 論文集 Vol.20 No.-

Human-beings have made and used a lot of tools since they came to live on the globe. It seems, however, the most valuable product among them is the language and letters. It's said that the language of today has been made as a kind of code in order to communicate much more complicated feelings and thoughts each other, while men without langnage merely expressed by many kinds of gestures. In uiew of the needs of the collective, social life, the invention of the language was inevitable. The social life, has been developed by the utility of the language. There are, how ever, many demerits of the language; ① as the language is a sound, the spoken sound is temporary and subjects to decay, ② as the sound which can be made by man; has the limitation, there's likewise spatial limits in the spoken language, ③ as the language can be merely once expressed, it's difficult content can't be examined closely, ④ as the language apheals to the ear, it isn't easy to remember it perfectly. But with the invention of letters as visual signs, the possibilities of the expression of thonghts and feelings has made much richer beyond the time and spatial limits. The development of printing also has plaged an important role in the use of letters and evalution of human culture. Letters is a kind of sign, which gives shape to the shapeless language. Such a letters, which is a necessary tool like the language in our daily life, will be in existence and developed as long as human society will be continued, because of human-beings were able to be the lord of all creation through the language, ard further through letters human culture was rapidly developed. Some say, therefore, letters is she representative of a certain society; what is more, it plays the role of paint in a measurement of a society. Letters has the both-sided functions: Lettering and Reading. Nowadays, Reading is more generalized than Lettering. The guartity of letters emerging from mass media, for instance newspapers, magazines, TV, etc., is increasing day after day. Many sorts of communication-vehicle are demanded, naturally, in modern mass-communication era, for the sake of efficient communication of innumerable information. Letters as a sign, which transfers the information, should take significant shape beyond merely letters as a sign, so as to be faithful to its function and promotes the visual, and aesthetical effects to recipients. That is, it's called for up-to-date sensitive funtional printing type and studies of letters, which takes the fresh appeal that is able to arouse everybody's sympathy. In case of Alphabet, design for Type face has remarkably developed because of the number of letters used for the understanding of each other is few and the number of strokes is very concise. Besides, the level of interest in the shape of a character and studies of Pictorial Letters is so high that effective and well-directed type is applicated in publications and any kinds of media. It's said that letters is the representative of a certain society and the point of the survey of a society, however, Han-Gul is naturally the representative of our current society. We have failed to overcome the difficult in the field of moulding and funtion of Han-Gul. From now on, we should expand the field of interest and research of letter-design, so that Han-Gul can be letters as the representative and the vehicle of a measurement of our community.

전자상거래에서 안전한 정보 교환을 위한 웹 서비스 기반의 XML 보안 모델

조광문 한국컴퓨터교육학회 2004 컴퓨터교육학회 논문지 Vol.7 No.5

인터넷에 기반하고 있는 전자상거래에서 무엇보다도 중요한 기술 요소는 거래 정보를 교환하는데 있어서 안정성을 보장하는 것이다. 이러한 보안 문제를 위한 다양한 기술들이 표준으로 제시되고 있다. 그 중에서도 XML(eXtensible Markup Language)이 전자상거래 시스템의 문서 표준으로 다양한 분야에서 사용되면서 XML 보안이 새로운 분야로 등장하였다. 본 논문에서는 웹 서비스(Web Services) 기반의 전자상거래 시스템에서 거래 정보의 안전한 교환을 위한 XML 보안 모델을 제안한다. XML 문서에 대한 보안을 이루기 위해서 XML 서명, XML암호화와 XML 키 관리 체계가 기존의 보안과 다른 차이점을 제시하고 고유 특성에 바탕을 둔 새로운 구조를 제시한다. 특히 전자상거래에 필요한 프로세스 관리 시스템과의 통합을 이룰 수 있는 방안을 제시한다. The most important technology in the electronic commerce based on Internet is to guarantee the security of trading information exchange. Many technologies are proposed as a standard to support this security problem. One of them is an XML (eXtensible Markup Language). This is used in various applications as the document standard for electronic commerce system. The XML security has become very important topic. In this paper an XML security model for web services based electronic commerce system to guarantee the secure exchange of trading information. To accomplish the security of XML, the differences of XML signature, XML encryption and XML key management scheme respect to the conventional system should be provided. The new architecture is proposed based on unique characteristics of XML. Especially the method to integrate the process management system need to the electronic commerce is proposed.

대두박에 대한 extrusion처리 및 formaldehyde처리가 젖소의 반추위내 in situ분해율에 미치는 영향

문여황,김기원,문점동,조광일,김병기,이성실,이상철 진주산업대학교 농업기술연구소 2001 農業技術硏究所報 Vol.14 No.-

This experiment was conducted to investigate the effect of temperature of extrusion processing on ruminal degradation characteristics of soybean meal. Four ruminally cannulated Holstein cows were employed to in situ trial and treatments were composed of soybean meals untreated(Control), extruded at 115, 130 and 155℃, and treated with 0.3% formaldehyde(HCHO). The nylon bags were suspended for 0, 3, 6, 9, 12 and 24 hours in the rumen, respectively. Animals fed the diet of 50 : 50 in concentrate and orchard grass hay at 110% of NRC(1988) requirements, and were freely access to water and mineral block. The regression equations for degradation characteristics and effective degradability(ED) of crude protein of soybean meals in the rumen were obtained as follows. Control P = 26.41 + 69.86(1-e^-0.041t) ; ED(k=0.05) = 57.89% 115℃ extrusion P = 3.39 + 44.76(1-e^-0.013t) ; ED(k=0.05) = 12.63% 130℃ extrusion P = 2.79 + 56.60(1-e^-0.015t) ; ED(k=0.05) = 15.85% 155℃ extrusion P = 1.71 + 31.48(1-e^-0.018t) ; ED(k=0.05) = 0.04% 0.3% HCHO P = 7.23 + 35.14(1-e^-0.015t) ; ED(k=0.05) = 15.34% where, P = Degradability during the time(t) suspended in the rumen, k = Passage rate at the rumen(%/hr/100). Ruminal degradabilities of dry matter, crude protein, organic matter and energy significantly (P<.01) decreased by extrusion or HCHO treatments, but did not affected by the temperature of extrusion processing. The ruminal degradation of soybean meals treated extrusion and formaldehyde, paticularly crude protein, was low beyond expectation.

보건관리 대행사업 평가 지표 및 척도개발에 관한 연구

박정일,조병희,구정완,김광종,김현욱,원종욱,이명숙,이원철,정문희 가톨릭대학교 산업의학센터 2000 韓國의 産業醫學 Vol.39 No.3

This study was carried out to develop the index and the scales for the evaluation of the group occupational health services(GOHS). The possible variables of each step, firstly, based on an evaluation model composed of four steps, input, throughout, output and outcome, were selected through several meetings of professional committee. And five types of questionnaire(for doctor, nurse, industrial hygienist, employer, and employee) were developed based on the selected variables. A pilot survey for four GOHS institutions and 12 enterprises was conducted using the questionnaires and correlation analysis for extracting variables was done. The results were as follows: 1.The evaluation scale was composed of three areas(evaluation on workers' health and work environment, evaluation by institution and employer, and evaluation by employee)which were devided into ten subscales. 2.Among firstly selected ninety-six variables, forty-three variables (11 for input, 14 for throughout, and 18 for output indices) were extracted by correlation analysis. 3.Based on the extracted variables, the questionnaires were simplified as five items for doctor, thirty-six items for nurse, nine items for industrial hygienist, and twenty-six items for employer and employee. 4.The total score of evaluation model was defined on the basis of four-hundred points as sum of four indices (input, throughout, output and outcome) given one-hundred points each.

병원근무자에 대한 특수건강진단 적용 가능성에 관한 연구

이수일,조병만,조봉수,김영욱,고광욱,문남출,김주원 大韓産業醫學會 1996 대한직업환경의학회지 Vol.8 No.2

병원근무자들에 대한 특수건강진단 적용 여부를 판단하기 위한 기초자료를 제공하기 위해 1995년 3월 10일부터 4주간에 걸쳐 부산시내에 위치하는 2개 종합병원 근무자 830명을 대상으로 설문조사를 시행해 얻은 결과를 요약하면 다음과 같다. 1. 조사된 43개 항목 중 10% 이상의 대상자가 유해요인에 폭로되고 있다고 응답한 항목은 소음, 분진 등 16개 항목이었다. 이 중 분진, 소음 및 스트레스는 연구대상자의 50%이상에서 폭로되고 있다고 응답했으며 그 외 알콜류 소독제(41.3%), 방사선(34.6%), 일반약제(33.3%)의 순으로 폭로되고 있었고 VDT의 경우 25.2%, aldehyde류는 18.7%에서 폭로되고 있는 것으로 나타났다. 2. 대상자의 63.1%에서 병원근무 환경 중에 유해인자가 존재한다고 응답했고 병원의 환경측정이 필요하다고 대답한 사람은 80%에 달했다. 35.7%가 유해인자에 대한 교육을 받은 적이 없다고 응답했다. 전체 응답자의 35.7%가 유해인자에 폭로시 보호 장비를 착용하지 않는다고 응답했고 주기적인(격년) 건강진단은 48.6%에서 받는 것으로 조사되었다. 근무부서의 환기상태는 7.2%만이 좋은 편이라고 응답했다. 이상에서 살펴본 바와 같이 병원근무자들이 여러 가지 유해환경에 노출되고 있고 또, 이로 인해 발생할 수 있는 건강장해에 대한 예방대책이 소홀한 것으로 나타나 병원의 작업환경측정의 시행이 필요하고 이 결과를 바탕으로 병원근무자들에 대한 특수건강진단 적용여부를 결정해야 할 것이다. This study was performed to decide the possibility of special health examination to the hospital employees. We carried out questionnaire survey for 830 subjects at 2 general hospitals located in Pusan city. The summary of this study are as follows. 1. Above 10% of total hospital employees were replied that they exposed to 16 hazard items, such as dust, noise, stress and etc. Among them, over 50% of hospital employees exposed to dust(69.8%), noise(52.3%), stress(60.1%). And hospital employees exposed to alcoholic disinfectant(41.3%), radiation(34.6%), drug(33.3%), VDT(25.2%), and aldehyde(18.7%) also. 2. 63% of the hospital employees replied that there were hazardous factors in hospital environments, and 80% insisted the necessity for hospital environment measuring. 35.7% of respondents replied that they had never taken the education about hazardous factors. 35.7% of the total respondents answered that they didn't use protective equipment when exposed to hazardous factors. And 48.6% answered they took periodic health examination. Only 7.2% replied that ventilation condition of office room was proper. As shown in above results, hospital employees are exposed to various hazards, and turn out neglecting to health problems caused these hazardous factors. So at first, it is necessary to measuring hospital working environment, and then will be decided the possibility of special health examination to the hospital employees.

보건관리 대행사업 평가도구의 타당성, 신뢰도 및 인과관계 검증에 관한 연구

박정일,조병희,구정완,김광종,김현욱,원종욱,이명숙,정문희 가톨릭대학교 산업의학센터 2001 韓國의 産業醫學 Vol.40 No.1

In order to verify the validity, reliability and relativeness of preliminary evaluation tool for the group occupational health services(GOHS), a questionnaire survey for doctors, nurses and hygienists of 18 GOSH institutions, and employers, health managers and employees of 340 enterprises was conducted. A factor analysis and correlation test for the statistical validity of the variables in the evaluation tool, a Chronbach's Alpha value for the reliability in the evaluation indices and a regression analysis for the relations of the evaluation model were performed. The results were as follows: 1.In factor analysis, thirty-three variables among 43 variables were selected as significant variables, ie 9 out of 11 for input index, 11 out of 14 for throughout index and 13 out of 18 for out put index. 2.Three evaluation(outcome) scales(evaluation by employer, health manager and employee) which composed of 16 identical items were used. 3.The Chronbach's Alpha values of input, throughout, out put and outcome indices were 0.5221, 0.5473, 0.7122 and 0.8546 respectively. 4.Regression equations of independent variables on the evaluation scales of employer, health manager and employee were all statistically significant.

간염 표지자 선별검사로써 혈구응집법의 유용성

이영진,조광호,문영희 圓光大學校 醫科學硏究所 1996 圓光醫科學 Vol.12 No.1

Background: Hepatitis B virus induces acute viral hepatitis and few of cases are associated with chronic hepatitis, liver cirrosis, hepatocellular carcinoma. To decrease viral hepatitis B infection, people are tested liver enzyme (AST, ALT). HBsAg and anti-HBs. In usually screen test of HBsAg and Anti-HBs are tested by Hemagglutination method. But screen test has some merits and some demerits (less sensitive and specific than EIA method). The demerits are that can not detect low level of HBsAg (a low-level carrier, acute hepatitis and chronic hepatitis) and is apt to be misdiagnosised. We select 100 cases with normal range of AST and ALT, and all negative results of HBsAg and anti-HBs by hemagglutination method. And compared the hemagglutination method result with the EIA method result, respectively. Methods: We selected 100 cases of both AST and ALT are normal range, and both HBsAg and anti-HBs (Hemagglutination method) are negative result. And then we retested HBsAg and anti-HBsAg by EIA method. Results: The results of HBsAg tested by EIA method were 100 cases negative. And the results of anti-HBs by EIA method were 88 cases negative and 12 cases positive result. Conclusions: On under the normal range of AST and ALT, the negative result of both HBsAg and Anti-HBs (Hemagglutination method) are concluded to be health. So we think hemagglutination method is good to screen test.

이동 애드 혹 네트워크에서 QoS를 지원하는 AODV 라우팅 프로토콜

吳世德,趙榮泰,丁燦赫,金玄郁,李光培,姜景仁,朴京培,文泰洙,郭承郁,河載承 明知大學校 産業技術硏究所 2003 産業技術硏究所論文集 Vol.22 No.-

Abstract - In this paper, we propose a bidirectional mobile Ad Hoc routing protocol based on AODV(ad-hoc on-demand distance victor routing) with QoS(quality of service) support. At presence, wireless mobile communication focuses on how to efficiently support mobility of users more than QoS guarantee. However, in order to satisfy requirement of various applications which have been or will be served, QoS guarantee between end point is a very important issue. The existing AODV routing protocol is implemented to use only BE (Best Effort) service. However, actual wireless mobile environment requires to reduce a waste of communication resources and meet with the real-time change of data paths by setting up routes with QoS support, considering available communication resources at each node in advance. Therefore, in this thesis, we propose an adaptive QoS support method using hello message in order to rapidly meet with the change of available communication resources and to smoothly perform route maintenance. For performance evaluation, we analyzed the average date reception rate. At that time, we used evaluation parameters such as node's mobility -stop time, hello message period, and packet priority, considering the node's mobility and the number of best effort/QoS data flows. As results, we found that with our proposed method the average data reception rate was increased 16.3% for 0 mobility-stop second case and 4.7% for 300 mobility-stop second case.

간세포암의 십이지장침윤에 의한 상부위장관 출혈 1 예

유태현,한광협,박성하,김형길,문영명,한재호,조상호 대한소화기내시경학회 1999 Clinical Endoscopy Vol.19 No.2

Recent advances in both the diagnosis and treatment of hepatocellular carcinoma have improved the prognosis and changed the clinical significance of the recently increasing distant metastases. Distant metastases found after successful treament of the primary lesions are of great clinical significance for the treatment of hepatocellular carcinoma. The duodenum is a rare site of hematogenous metastases or direct invasion from hepatocellular carcinoma. A 23 year old man was admitted with upper gastrointestinal bleeding. He had been diagnosed with hepatocellular carcinoma and treated by a left lobectomy and chemoembolization. The patient was admittted for 12 months after the treatment of the primary tumor. Endoscopic examination revealed a mass in the duodenal bulb that protruded into the lumen. He died due to massive hematemesis. We report on a rare case of hepatocellular carcinoma with duodenal invasion in a 23-year-old male patient.