放射線이 생쥐生殖細胞에 미치는 影響에 關한 硏究

千基貞,柳炳善,鄭圭會,鄭海元,李鉦浩 대한방사선 방어학회 1985 방사선방어학회지 Vol.10 No.1

The objectives of present study is to investigate genetic damage of radiation in mammalian male germ cell and to establish available screening method for determining genetic hazard by radiation. Several methods were employed to measure the genetic damage of radiation as follows: Sperm head counts, frequency occurrence of sperm with abnormal head shape, fertility, activity of LDH-X, and the induction of unscheduled DNA synthesis (U.D.S.) in male mouse were performed with the passing of time after irradiation by making use of the sequence of event that occurs during spermatogenesis. Sperm head counts and activity of LDH-X in testes were gradually reduced by increased radiation dose and with the passing of the time after irradiation. Frequency occurrence of sperm with abnormal head shape, sterile period, and the induction of unscheduled DNA synthesis were increased by increased radiation dose. It is suggested that since germ cell is a direct reflection of genetic complement, the use of male germ cell is rapid and convenient method for measuring genetic damage by radiation.

內部熱源을 갖는 直方體의 傳熱特性에 관한 硏究

朴春根,全哲昊,徐海成 동아대학교 공과대학 부설 한국자원개발연구소 1984 硏究報告 Vol.8 No.2

A numerical and experimental study have been performed on the heat transfer in rectangular solid owned heat source. The effects of thermal conductivity k, heat transfer coefficient h, temperature of surrounding fluid To and the rate of heat flow Q were studied numerically by F. E. M. The experiment were studied by given rectangular solid. The results of F. E. M. and experimental are as follows. 1) The F. E. M. to calculate the temperature distribution in rectangular solid showed good agreement with experimental. 2) Thermal conductivity influenced strongly temperature distribution in the solid but heat transfer cofficient influenced only surface. 3) Temperature gradient in the solid was unconcerned by temperature of surrounding fluid and rate of heat flow but temperature in the solid changed at a fixed rate.

전략적 생산설비 투자계획 및 관리를 위한 생산능력의 비용화

박해천 조선대학교 생산기술연구소 2000 生産技術硏究 Vol.22 No.1

An efficient application of equipment capacity is an important factor for a company of today to survive under a extremely competitive market environment However, many companies have made an great effort to increase an external capacity by putting much input such as time and money without scrutinizing an equipment efficiency As a result of such increased equipment capacity, they have been faced with the problem of how to effectively deal with its excess capacity which is somewhat indispensible capacity for a company's business and thus can not be completely eliminated in a real world Therefore, this paper is concerned with defining capacity factors in detail to get practicable application devices and deriving their cost to provide a useful financial information for a company's management to make a sound investment decision. We present the real case study to show the applicability of the methodology we developed in this paper

朝鮮族人生義禮變遷

洪春海 韓國暻園大學校아시아文化硏究所 中國中央民族大學韓國文化硏究所 2002 亞細亞文化硏究 Vol.6 No.-

This thesis has researched the Korean lifetime ritualism with the studies of the nation and the tradition of this nation. Via studying on the ritualism of Koreans concerning birth, hats, wedding and death, I illustrate the prevailing social status and am trying to explain the interior content of the Korean culture. Lifetime ritualism is one of the important part of Korean culture and is of great values. And by illustrating the development of Korean lifetime ritualism, I am intending to help understand the featues and the reasons of such development and help the ritualism lead to a healthy direction. There are five parts of this thesis. Part one has illustrated the religious background and cultural inside of Korean ritualism. Confucianism has done the greatest effect over Korean lifetime ritualism; lifetime ritualism occurs at key changing moments of parts of body and one's position and there are three phases of theis ritualism: separation, transfer and interfusion. Part two briefly illustrate the ritualism of birth, which is the first ritual ceremony of lifetime and is always paid enough attention to. Ritualism of birth is also of women, which shows the position of a woman in her family and shows the hope and care of the woman towards her children. Part three briefly illustrate the turning and culture on the ritualism of hats. Hats stands for growng up and via complex procedures of hat wearing ceremony, the one wearing such a hat step up into the spiritual cultural world of the society. Therefore this important ritualism is for the person to experience and inherit Korean common cultures and value. Part four has compared the wedding procedures of ancient and current times and compared such procedures with those of the Republic of Korea. The turning and features of Korean are also shown in this part. As the time goes, there have appeared a series of development on procedures and utensils of a wedding and some deep meanings in a wedding ceremony have also altered. Part five is on the development and procedures of ritualism on death and hereby I illustrate the changing features and reasons of this ritualism. Korean ritualism on death has changed to various extents concerning its procedures and contents, some of which are caused by local living environment. Part six has illustrated the performance, functions and future expectations of various types of lifetime ritualism. Lifetime ritualism is able to turn the daily life from one status to another. And its final function is to adjust the disturbed normal daily orders caused by the newly born lives, deaths of relatives and changes of people's positions. Some taboos of lifetime ritualism function somehow at different periods and some taboos are scientifically based. Conserving and developing the lifetime ritualism help inherit the national cultures and are also in conformity woth the current developing trends of today's world towards multiple choices. The schedule is tight and due to my limited knowledge, hereby I am asking for corrections from all you experts.

설비 자동화를 통한 공정 개선 사례

박해천,김현우,이안섭 대한설비관리학회 2004 대한설비관리학회지 Vol.9 No.2

The purpose of this study is for a company with a great amount of product lead time to reduce the number of its workers and its product lead time by constructing an integrated system, which is formed by the introduction and development of hardware and software in the equipment line of the company. In this study, a company which had a lot of manual processes and therefore needed to stabilize the flow process and the production system for securing technical capacity, was selected. For the purpose of improving the process of the selected company, the present system was analyzed and some sectors which required process improvement were investigated. An integrated system was constructed by introducing and developing software(a CNC design program) as well as hardware(loading/unloading and pallet devices). In addition, the data before processing and the data after processing were comparatively analyzed to see if the process had valid results. The time required and the number of workers required in making the same product were respectively included in the data be-fore processing and after processing. As a method of measurement, a stopwatch method was used and the measurement was done 15 times.

正方形 DUCT內 亂流流動의 熱傳達에 관한 硏究

朴春根,全哲昊,徐海成 동아대학교 공과대학 부설 한국자원개발연구소 1983 硏究報告 Vol.7 No.2

A numeical and experimental study has been performed on heat transfer in square duct. The effects of distant P between dry solides and Reynolds number were studied numerically by Finite Element Method(F.E.M.) The experiment were studied according to F.E.M. analysis by Universal Digital Measuring system. The results of F.E.M. analysis and experimental are as follows. 1) Comparison between mumerical and experimental results showed good agreement. 2) Heat transfer increases according to decrease of the P/D ratio and increase of H/L ratio too.

생산 일정 관리 시스템 개발에 관한 연구

박해천,강성군 조선대학교 생산기술연구소 1999 生産技術硏究 Vol.21 No.1

Existing production methods and management patterns come to a crisis to do with diverse demands of customers and rapid changes of outward circumstances of these days. To face such crisis. information important for production should be gathered and managed, and it is most effective to build computerized information management system. As it was in the past when mass production was preferred. thorough knowledge of material flow, one of most important factors in significant these days when small production of various items to meet customers' diverse demands. In this paper, a program is suggested where the theory of MRP-II(Manufacturing Resource Planning) - a production management system, the heart in making integration of production information, - is applicable, and methodology on technical integration of information on work flow between client and servo is also suggested with easy interface and easy input and output of data, which easiness is secured in the suggested program.

다단계 자동가공/조립제조시스템에서 다목표 작업제어 기법

최정상,박해천 한국공작기계학회 1998 한국생산제조학회지 Vol.7 No.1

This paper is concentraed on a study of operation control for mutiple objectives in a automated manufacturing system with multiple machining cells or assembly cells. Largest Sum Processing-time First(LSPF) was developed in order to minimize makespan, mean flowtime and maximize mean utilization and compare with Ho and Chang's algorithm(HC) and Hunsucker and Shah's algorithm(HS). The results show that LSPF provides better soutions than HC at 78.2% and than HS at 67.8% of total problems to frequency. LSPF reduces 5.8% of makespan by HC and 22.1% of the valus by HS and curtails 15.8%, 7.5% of mean flowtime by recpective algorithms(HC, HS). And mean utilization is also higher about 5.5%, 20.8% than HC and HS.

전격성 경과를 취한 만성 호산구성 폐렴 환자 1예

윤호상,진춘조,유광하,이상엽,이수인,정상만,김선두,이순제,이길도,전혜정 건국대학교 의과학연구소 2000 건국의과학학술지 Vol.10 No.-

Chronic eosinophilic pneumonia(CEP) is a rare disease of unknown etiology characterized by chronic infiltration of the lung with eosinophils. It presents with profound systemic symptoms comprising fever, night sweats, weight loss, dyspnea and blood eosinophilia with nonsegmental air-space consolidation confined to the outer third of the lung, the "photographic negative of pulmonary edema". Histopathologic features of chronic eosinophilic pneumonia are intraalveolar and interstitial infiltrations with eosinophils, histiocytes, giant cells, scattered lymphocytes and plasma cells. Glucocorticoid therapy cause prompt resolution of symptoms as well as disappearans of blood eosinophils, elevated serum Ig E levels and the roentgenographic lesions. Infrequent radiographic findings include nodular infiltrates, consolidations, cavitations, atelectasis and pleural effusions. Deaths from CEP although rare, have been reported, but the majorities of CEP have benign courses and do not need a therapy with ventilator. We report a case of chronic eosinophilic pneumonia, which had a sudden course associated with diffuse pneumonic consolidations on the both lung and bilateral pleural effusion.

전자산업 협력업체 안전관리 개선방안 연구

김헌수,박해천 조선대학교 생산기술연구소 2005 生産技術硏究 Vol.27 No.2

Lately, electronics industries manufacture electronic products in cooperation between mother companies producing finished goods and sub-contractors delivering parts to them. So, in electronics industries, not only are the manufacturing activities of mother companies important but also are the manufacturing activities of sub-contractors supplying various components to their customers important. With this environment, it is difficult to survive in the global competitions not only for the parts suppliers but also for the customers being supplied with parts by their part sub-contractors. But, it is getting specialized so the customers could not survive without their sub-contractors. So, the customers need to consider their suppliers as their extended production lines and introduce a comprehensive safety management support system to prevent industrial accidents by implementing systematic safely management support activities.