정상 한국인에서 연령증가에 따른 혈장 Dehydroepiandrosteronesulfate ( DHEA-S ) 농도 및 DHEA - S / cortisol 비의 변화

박성우,유형준,임성희,최문기,유재명,박민숙,이권엽,박철수,김철홍,김현규,김두만,박규용 대한내분비학회 1997 Endocrinology and metabolism Vol.12 No.2

Backgroud: DHEA-S is the most abundant steroid hormone in circulation, and primarily secreted from the adrenal cortex, but its physiological role is little known. One of the characteristic features of DHEA-S is progressive decrement of plasma DHEA-S level with advancing age, in contrast, plasma levels of other adrenal hormones are not chaging or littie decreasing. To grasp the trends of plasma DHEA-S level and DHEA-S/cortisol ratio by age in healthy Korean, we measured the plasma DHEA-S levels and DHEA-S/cortisol ratios in healthy Korean. Methods: Healthy Korean(men: 99, women: 102, age range: 15-97 year old)were studied. Subjects were not taking drugs(such as glucocorticoid or androgenic medication) or cigarettes known to modify the plasma level of DHEA-S and cortisol, and had no evidence of hepatic, renal disease or hyperlipidemia as determined by serum lipid, bilirubin, SGOT, SGPT, BUN, creatinine. Data were analyzed by 10-year age group for men and women: i.e, 10-19, 20-29, 30-39, 40- 49, 50-59, 60-69, 70-79, 80-89 and 90 year or more. Plasma DHEA-S levels were measured by using a commercially available RIA kit with 125I labeled-DHEA-SO4(Coat-A Count DHEA-SO4), and for the measurement of plasma cortisol levels, commercial Gamma Coat TM[125I] Cortisol Radioimmunassay Kit was used. Results:. 1) In both men and women, plasma DHEA-S level showed high interindividual variation within the same age group. 2) There were individual sex differences in plasma levels of DHEA-S, in all age groups, plasma DHEA-S levels were significantly higher values for men than for women. 3) Maximum plasma DHEA-S levels(men; 237+-3.35 ug/dL, women; 108+-17.5 ug/dL) were at third decade in both men and women. 4) Both men and women showed the continuous decline in plasma DHEA-S level with age. These age-related decline was more prominent in men than in women(men; y= -3.152 * +292.6, r2= 0.8459, P$lt;0.05, women; y= -1.417 * +143.3, r2 = 0.7278, P$lt; 0.05). 5) As an index of aging, there was no stastical difference between DHEA-S and DHEA- S/cortisol ratio. Conclusion: In healthy Korean, there were high interindividual variation of plasrna DHEA-S levels. In both men and women plasma DHEA-S level was peak at third decade, and from when it declined progressively with age. These results suggest that although the reliability of single plasma DHEA-S measurement are limited, the decline of DHEA-S with advancing age might be a specific marker of endocrinologic hormonal milieu(aging index). Also, concerning to individual adrenal secreting capacity, we measured DHEA-S/cortisol ratio. But we did not found that plasma DHEA-S/cortisol ratio is superior to the plasma DHEA-S level as an aging index. (J Kor Soc Endocrinol 12:245-254, 1997)

당풍(唐風) 수용기 정용(鄭鎔)의 한시(漢詩)에 대한 고찰 -시선집(詩選集)에 수록된 작품을 중심으로

박용만 ( Park Yong-man ) 한국한시학회 2016 韓國漢詩硏究 Vol.24 No.-

조선중기 盛唐詩를 수용한 三唐詩의 등장은 우리 문학사에서 매우 중요한 분기점이 된다. 문학사에서 새로운 풍조의 유행은 몇몇 작가의 노력만으로 이루어질 수 없으며, 당시 활동했던 많은 시인들이 교유하고 참여하는 과정에서 典範의 논리와 방향성이 자리를 잡게 된다. 그러나 三唐詩人을 제외하면 이 시기에 활동했던 여러 시인들에 대한 논의는 절대적으로 부족하다. 鄭鎔은 그동안 전혀 알려지지 않았던 시인으로 삼당시인이 활동했던 시기에 참여한 인물이다. 靖國功臣으로 海平府院君에 봉해진 鄭眉壽의 후손으로 화려한 가문의 배경과 경제적 풍요에도 출사하지 않고 자연을 벗 삼아 시작에 전념하였다. 많은 작품을 남긴 것은 아니지만 許筠은 그의 작품을 높이 평가하여 『國朝詩刪』에 6수를 선발하여 넣고 『鶴山樵談』과 『惺所覆?藁』에도 그에 대한 詩話를 수록했을 만큼 당시 상당한 비중을 지녔던 것으로 평가할 수 있다. 그는 唐風을 수용하여 정회를 표출하였다. 때로는 미숙한 작품이 보이기도 하지만, 절구 형식을 선호하여 주로 주위 경물과 심사를 소박하게 표현하는 특징을 보인다. 시화에 실린 일부 방대하고 현란한 의경의 작품을 허균은 詩魔가 들어 지은 것으로 소개하였다. 소박한 의경의 다른 작품과 연관성이 떨어지지만 정용의 입을 통해 지어진 것만은 분명하다. 조선 중기 당풍의 정착과 유행의 관점에서 정용의 담백하면서 소박한 한시는 일정한 의미를 지닌다고 할 수 있다. 아울러 당시 알려지지 않은 많은 시인들의 다양한 시풍을 논의하는 것은 당풍의 수용을 폭넓게 이해하는 단서가 될 것이다. The appearance of Chinese poems of the Tang Dynasty style by three poets in the Joseon Dynasty(三唐詩) that accepted the Tang poetry during its flourishing period(盛唐詩) became the turning point of Korean literary history. Trends of new tendencies in literary history cannot be done by several writers` efforts and model(典範)`s logic and directivity get to settle in the process that many poets who are active then associate with each other and participate. However, except the three poets who wrote the Tang Dynasty`s Chinese poem styles, discussion on several poets who were active in this period are desperately lacking. Joeng Yong(鄭鎔) is the figure who participated in the period that the three poets who wrote the Tang Dynasty`s Chinese poem styles were active as the poet who has never been known to us in the meanwhile. He devoted himself to writing his poems by communing with nature without entering government service despite the background of his distinguished family and economic affluence as the descendant of Jeong Mi-su(鄭眉壽) who was raised to Haepyeongbuwongun(海平府院君) as Jeonggukgongsin(靖國功臣). He did not leave many works of art. However, he can be evaluated to account for a considerable proportion of the period as Heo Gyun put his 6 poems in Gukjosisan(國朝詩刪) and included stores about his poems in Haksanchodam(鶴山樵談) and Seongsobugo(惺所覆?藁) by thinking highly of him. He expressed his thoughts by accepting the Tang Dynasty`s Chinese poem styles. Sometimes, he shows unpracticed works of art. However, his works of art usually feature simple expressions of the scenery of the seasons around him and his mind and thought as he gave preference to quatrain forms. Heo Gyun introduced his partial works of art about the vast and ornate scenery written by him because of a kind of spells that he felt a disposition to do them(詩魔) to people. It is clear that they were written by Jeong, Yong`s mouth even though they are not linked to his other works of art about the simple scenery. Jeong, Yong`s light and simple Chinese poems can somewhat be meaningful from an angle that the Tang Dynasty`s Chinese poem styles settled and were popular in the middle of the Jonseon Dynasty. In addition, discussion on various poetical styles by many poets who were not known then will be a clue to understand acceptance of the Tang Dynasty`s Chinese poem styles widely.

신광수(申光洙)의 「탐라록(耽羅錄)」에 나타난 제주에 대한 인식과 정서

박용만 ( Park Yong-man ) 제주대학교 탐라문화연구원 2021 탐라문화 Vol.- No.66

조선시대 제주는 신화가 살아있는 공간이었다. 다가갈 수 없었던 육지인 들에게 제주는 관념적 공간이었지만 실제 제주를 경험한 지식인에게 제주는 목숨을 걸어야 하는 현실의 공간이었다. 1764년 서울에서 파견되었다가 풍랑에 발이 묶여 45일간 제주에 머물렀던 申光洙에게 제주는 ‘갇힌 공간’이었다. 신광수가 제주에 체류하며 남긴 「耽羅錄」에는 모두 49편의 시가 신광수와 李瀷의 서문과 함께 실려 있다. 원래 신광수와 함께 간 이익, 박수희가 창화한 것이지만 신광수의 문집에는 다른 두 사람의 시는 없고 두 편의 서문과 본인의 시만 수록하였다. 신광수는 육지로 돌아온 이후 제주에서 기록한 창화록을 주위 지식인에게 보여 睦萬中, 丁範祖, 李玄煥의 서문을 받았다. 이외에도 蔡濟恭은 그에 대한 묘지명에서 이 일을 자세히 기록하였다. 그러나 신광수와 육지 벗들의 서문에는 제주를 바라보는 인식에는 큰 차이가 존재한다. 제주는 육지인들에게 신선이 사는 동경의 공간인 동시에 목숨을 잃을 수도 있는 가기 싫은 공간의 이중성이 나타난다. 이에 비해 신광수에게 제주는 絶島이자 자신의 의지와 무관한 孤立無援의 공간이었다. 벗어나고 싶어도 벗어날 수 없는 ‘갇힌 공간’이었다. 개성주의 문학사상이 확고하게 자리 잡았던 18세기 문학은 현실과 괴리된 관념이 더 이상 허용되지 않았다. 주위의 지식인조차 제대로 이해하기 어려웠던 제주의 경험을 기록한 「탐라록」은 신광수의 제주 인식은 18세기 문학을 바라보는 중요한 기록이 된다. During the Joseon Dynasty, Jeju(濟州) was a place where myths lived. Jeju was an ideological space for landlords who could not approach, but for intellectuals who actually experienced Jeju, Jeju was a real space where they had to risk their lives. Jeju was a “confined space” for Shin Kwang-soo(申光洙), who was dispatched from Seoul in 1764 and stayed in Jeju for 45 days after being trapped in a storm. In the ‘Tamna-Rok(耽羅錄)’ left by Shin Kwang-soo while staying in Jeju, there are 49 poems along with the forewords of Shin Kwang-soo and Lee Ik(李瀷). Originally, it was created by Lee Ik, Park Soo-hee, who went with Shin Kwang-soo, but in Shin Kwang-soo's writings, there were no other poems, only two prefaces and his own poems. After returning to the mainland, Shin Kwang-soo showed the changhwa-rok(唱和錄) recorded in Jeju to the surrounding intellectuals and received the forewords of Mok Man-jung(睦萬中), Jeong Man-jo(丁範祖), and Lee Hyun-hwan(李玄煥). In addition, Chai Je-gong(蔡濟恭)'s name of the grave for him recorded this in detail. However, there is a big difference between Shin Kwang-soo and his friends on land in their preface to seeing Jeju. In the land, the duality of the space where Shinseon(神仙) lives in, and the space that they don't want to go to, which can lead to death, appears. On the other hand, for Shin Kwang-soo, Jeju was both a remote island and a space of an isolated employee that had nothing to do with his will. It was a "confined space" that could not escape even if it wanted to escape. Literature in the 18th century, in which individualistic literary thoughts were firmly established, was no longer allowed to have an idea apart from reality. Shin Kwang-soo's perception of Jeju, which “Tamna-rok”, about the experience of Jeju, which was difficult for even the surrounding intellectuals, to understand properly becomes an important record for viewing 18th century literature.

기판온도와 레이저에너지에 따른 PbTe 박막의 결정구조 및 전기적 특성

박용대,박종만,정중현 釜慶大學校 2000 釜慶大學校 論文集 Vol.5 No.-

To determine how crystalline structure of PbTe thin films vary according to the growth temperature and laser energy, PbTe thin films were grown using PLD method on p-Si(100) substrates under a substrate temperature changing between room temperature(RT) and 400℃, the thin films were also prepared under different laser energies ranging between 100 mJ and 300 mJ. As a result of analyzing XRD patterns and FWHM of PbTe(200) rocking curve, it was found that PbTe thin film grown at the growth temperature of 200℃ and that obtained with laser energy of 200 mJ were best crystallized. The measurement of Hall effect indicated that PbTe thin films were n-type semiconductors and the current-voltage characteristic curve exhibited the typical p-n junction phenomenon. In addition, electric conductivity of PbTe thin films was found somewhat higher than that of general semiconductors.

구강 내 디지털 인상채득을 통한 맞춤형 지대주와 시멘트 합착 후 나사형 임플란트 보철 수복 증례

홍용신,박은진,김선종,김명래,허성주,박지만 대한치과보철학회 2012 대한치과보철학회지 Vol.50 No.1

최근 디지털 인상채득 시스템이 개발되면서 이를 기존의 CAD/CAM 시스템과 접목한 인레이, 온레이, 크라운이나 간단한 계속가공의치 등의 고정성 보철물의 제작이 활발히 소개되고 있다. 그러나 임플란트 보철에서는 주로 기존의 아날로그식 인상채득 후 이를 스캔하여 제작하는 방법이 사용되어 왔으나, 구강 내 디지털 스캔한 데이터를 이용하여 나사형 보철물을 제작하는 술식은 아직 활발히 이루어지지 않았다. 이에 본 증례보고에서는 6명의 환자를 대상으로 구강 내 스캐너인 iTero를 사용하여 디지털 스캔을 시행한 후 그중 다섯명은 맞춤형 지대주와 시멘트 합착 후 나사형 임플란트 보철물(screw-retained implant prosthesis after cementation, or SCRP)을 제작하였고, 임상적으로 기능과 심미적인 측면으로 만족할 만한 결과를 얻었기에 이를 보고하고자 한다. Fixed dental prostheses such as inlay, onlay, crown, and bridge fabricated by CAD/CAM technique combined with digital impressions is getting popular due to the recent rapid progress of digital impression taking system. For the scope of implant prosthesis, however, digital intra-oral scan hasn’t been actively utilized for the fabrication of superstructures. In this case report, 6 cases of titanium-milled custom abutment based on the iTero intra-oral scan data were introduced, five of them were restored with screw-type prosthesis after cementation (SCRP) and the clinical results were satisfactory on restoring the function and esthetics.

NiSO₄·7H₂O의 焙燒에 關한 硏究

朴龍鎭,趙萬衡,許南棺 弘益大學校 1983 弘大論叢 Vol.15 No.2

Roasted NiSO₄·7H₂O after dehydration and also roasted it with a mixture of FeSO₄and CuSO₄. From this experiment the following results have been investigated: 1. The roasting reaction of NiSO₄comenced at 750℃ and finished at 915℃. 2. Desulphuration in roasting reaction of FeSO₄or CuSO₄or with charcoal powder has been influenced by adding a quantity of charcoal powders, but the roasting rection of NiSO₄with charcoal powder have no effect on desulphuration in spite of adding power being increased in great quantities. 3. The roasting reaction of NiSO₄starts at a higher temperature than that of FeSO₄or CuSO₄and is completed at a higher temperature than both of them. Also, we have found out that the roasting reaction of these compound(FeSO??/ CuSO₄, FeSO₄/NiSO₄or CuSO₄/NiSO₄) starts and is completed at a temperature between the starting and completion points of these two sulphate roasting reactions.

光 파이버 자이로스코프에 關한 硏究

朴容萬 忠州大學校 1987 한국교통대학교 논문집 Vol.21 No.-

One of the most dramatic recent development in optical technology is the optical-fiber gyro, which combines the properties of the optical oscillator and laser. This gyro measures rotation in inertial space, but dose not use a spinning mass as conventional gyro do. Because of the absence of spinning mass, the gyro's performance is not effected by accelerations, ; and it can sense very high rate with great accuracy. Other impotant advantage of the optical-fiber gyro are low power consumption and simplicity of construction.

전기회로망해석 입문 자를 위한 기본적 관점에 대한 고찰

박용만 忠州大學校 2002 한국교통대학교 논문집 Vol.37 No.3

An introductory course to Electric Network Analysis is described. Both time domain analysis and frequency domain analysis are covered by this course. It is intended that students see these techniques within a global framework. In this paper we analyze problems that students have to solve. Examples of the difficulties that students have are presented. Several kind of problems can be distinguished. Difficulties in concepts and some measures to support concept formation are discussed. Finally, a possible change in the overall sequence of problems is proposed.

전자공학 첫 과정으로 컴퓨터 툴 소개

朴容萬 충주대 2001 한국교통대학교 논문집 Vol.36 No.2

At a school where engineering students have immediate access to a personal computer, it is important that they become familiar with that tool early in their studies.In introductory engineering courses it is also important that the students learn to perceive the computer as a tool and not as an end in itself.Achieving these goals requires a carful integration of computer usage into such courses by the instructors.In this paper we examine this issue in the context of a first course in electrical engineering that has been taught at the Chung ju National University, and we present specific examples of assignments we have used in our effort to accomplish these goals.

디지탈 필터에 대한 SPICE 시뮬레이션

朴容萬,柳然國 忠州大學校 1996 한국교통대학교 논문집 Vol.31 No.2

A simple SPICE model for IIR direct form 2 biquad section is described briefly in this paper. Digital filter consisting of up to four biquad sections can be analysed with SPICE. A simple model is given for application. An evaluation version of Pspice is used as a circuit simulation tool. This model opens possibilities of low-cost exercises and simulated laboratory experiments in design and education of digital signal processing.