저농도 화학적 산소 요구량의 측정법 연구

정형근,조민제 연세대학교 보건과학연구소 1997 보건과학논집 Vol.7 No.-

遮光度가 茶葉의 Chlorophyll 色素에 미치는 영향

정영민,김동연,은종방,박근형 全南大學校 農漁村開發硏究所 1991 農業科學技術硏究 Vol.26 No.-

차광도가 다른 재배환경이 다엽의 Chlorophyll 색소함량에 미치는 영향을 조사하고자, 재배차의 무차광 및 차광다엽, 그리고 야생차의 연중 반차광다엽과 연중 차광다엽을 대상으로 검토한 결과, Chlorophyll의 함량은 차광 정도에 따라 차이를 보였는데 무차광다엽보다 차광다엽이 높은 경향을 나타냈다. Chlorophyll a와 b의 조성은 무차광다엽은 3:1, 그리고 차광다엽은 2.8:1로 그늘에서 자란 것이 Chlorophyll b의 비율이 증가하는 경향을 나타냈다. The effect of shading on the Chlorophyll content of tea shoot was examined under the different shading conditions shaded and unshaded tea shoots obtained from cultivating tea were analyzed while partial shaded and through-shaded tea shoots were used for wild tea. Analysis of the Cholorophyll contents of tea shoots revealed that different shading conditions resulted in different Chlorophyll contents and higher content of Chlorophyll was found in the shaded case. The composition of Chlorophyll a and b was 3:1 and 2.8:1 under unshaded and shaded conditions respectively, which indicated that the ratio of Chlorophyll b to Chlorophyll a increased under the shading condition.

염화제일주석 환원법을 이용한 수용액 중 정인산염인의 자동화 측정에 관한 연구

정형근,조영일 연세대학교 보건과학연구소 1995 보건과학논집 Vol.5 No.-

지난 2년간의 학회지 "신경정신의학" 심사 평가보고

김찬형,김세주,김도관,김성곤,박원명,송동호,박용천,이영문,오강섭,정영철,이상열,김주한,이동영,이헌정,함병주,김율리,김문두,김정진,이강욱,천근아,김재진,홍진표,홍승철 大韓神經精神醫學會 2007 신경정신의학 Vol.46 No.6

철봉 경기에 있어서 연기구성과 TKATCHEV기술에 관한 연구 분석 : 1995년 세계 체조 선수권 대회 및 세계 청소년 체조 선수권 대회를 중심으로

류근림,정형균 경희대학교 체육과학연구소 1996 體育學論文集 Vol.24 No.-

The following conclusion can be drawn from this research, based on various techniques such as Tkatchev technique, difficulty technique level of Tkatchev technique, advantages of high level techniques for a higher score, and technique combination demonstrated in the performance in the World Gymnastics Games of 1995 and the World Youth Gymnastics Games. 1.Scenario of Gymnasts' Performance and the Tkatchev Technique As a whole, players at the World Gymnastics Contest demonstrated, on an average, 9.75 point performance consisting of 14 times of B level difficult techniques, 11 times of C level difficult technique, 39 times of D level difficult technique, and 14 times of E level difficult techniques. Six members out of eight participants demonstrated the Tkatchev technique. Among players who performed the Tkatchev technique are there six players including Wecker. A from Germany in the first place of the compitition, Hadakeda. Y. from Japan in the second place, Dounev. K. from Bulgaria in the third place, Scherbo. V. from Belarusi in the fifth place, Sandro. V. from Rumania in the sixth place, Preti. B. From Italy in the seventh place, and only two players, Zhang. J. from China and Karbomenko. D. From Russia did not demonstrated the Tkatchev Techique in the compitition, Players at the World Youth Gymnastics Contest performed, on an average, 9.25 point performance consisting of 5 times of B level difficult techniques, 9 times of C level difficult techniques, and 17 times of D level difficult technirques, and only two players demonstrated the Tkatchev technique. Among the two players one is Skahala. D. from Japan in the second place and Bondanenko. A. from Russia in the fourth place of the compitition. Bondanenko A. in the forth place seemed to receive a cut in his marks from her mistake of falling from the horizontal bar which eclipsed her high technique of Tkatchev. Contents of Tkatchev techniques demonstrated by players contained various techniques such as "holding the bar by turning over the bar and jumping off hand with legs widely stretched (C level difficulty), holding the bar after turning over by hanging by one hand with two legs gathered together (D level difficulty), holding the bar by jumping and turning back over the bar with legs gathered together (C level difficulty), holding the bar by jumping and turning back over the bar with the body stretched (D level difficulty). Some special features in their performance are good combination of the techniques with one or more techniques to increase value of their performance. 2.Difficult Technique Levels of Players' Tkatchev Performance In their performance of the Tkatchev technique itself, difficult levels of difficult technique can be analyzed as follows. There were five times of Tkatchev performance of C level difficulty, and five times of the performance of D level. Additionally, there were also five times of Tkatchev performance combined with other techniques of D level difficulty and two times of E level difficulty. From this result, we can interpret that the performance of high level of difficult techniques combined with other technirques such as D or E level can difficulty induce higher score with advantages of bonus marks than the performance of just simple Tkatchev technique alone. 3.Tkatchev Technique and Combination Technique of Tkatchev with other Techniques In the examination of players' performance of Tkatchev combination with other techniques, there appeared once of turning act in each performance which is most common, and then combination with hand-standing with legs open stretched, hand-standing with one-round turn were demonstrated in their performance. All players in both gymnastic compititions showed performance of one-step-elevated technique by demonstrated Tkatchev combination with other techniques among which jumping and turning in the air were commonly applied for their performance because that combination with Tkatchev technique was rather easier part. 4.Additional Score for Players Performance of High-Level Techniques and their Technique Combination The performance of high-level techniques including Tkatchev combination with other techniques was acknowledged as D or E level difficulty with additional points. That is, players who demonstrated performance higher than C level technique including Tkatchev combination with other jumping and turning techniques took advantage for their score with additional 0.20 points. In conclusion, gymnastic performance with demonstration of various high-level techniques of D. E. Level difficulty and Tkatchev combination with other jumping or turning technique in the air can escalate one step higher in its evaluation. In this context, performance combined with variours techniques in their gymnastics is recommended for higher points rather than demonstrating simple performance of monotonous high-level technique above D level alone in gymnastics.

치과 재료용 NiTi 합금의 특성에 대한 Ag 첨가의 영향

오근택,박기호,심형민,황충주,김경남 大韓齒科器材學會 2001 대한치과재료학회지 Vol.28 No.4

Equiatomic and near-equiatomic nickel-titanium alloys have shape memory effect and superelasticity. However nickel-titanium alloys are extremely sensitive to the precise nickel-titanium ratio and alloying additions. There are many reports on the alloying additions such as Fe, Al, Cr, Co, V, Pt, Pd, Zr, Hf, Nb and Cu. The purpose of this study was to investigate the effect of silver addition to nickel-titanium alloy for dental and medical application.Arc melting process was used to fabricate nickel-titanium alloys. The casts were heat-treated in a vacuum furnace at 950℃ for 72 hours to homogenize their composition. Subsequently, they were hot-rolled at 950℃ to obtain the plate samples and annealed in a vacuum furnace at 950℃. To investigate the properties of nickel-titanium alloys, phases, transformation temperature, compositions, corrosion resistance and hardness were evaluated using X-ray diffractometer, differential scanning calorimeter, energy dispersive spectroscopy or atomic absorption spectroscopy, potentiostat and micro-vickers hardness tester, respectively. NiTiAg alloys showed the low silver recovery rate for the cast due to its low evaporation temperature, and showed low silver solubility to NiTi alloy. Silver addition to NiTi alloy increased transition temperature range (TTR) above 100℃ and stabilized martensitic phase(monoclinic structure) at room temperature because Ms temperature was above room temperature. Martensitic and austenitic phase existed in x-ray diffraction pattern of solution annealed NiTiAg alloys. The Silver addition is considered to improve corrosion resistance and change largely the mechanical properties depending upon the amount of alloying addition and types of addition elements.

결핵성 육아종에서 Thioredoxin peroxidase-2 의 발현

박근호,유형륜,정영진,윤기중,한원철,유대열,문형배 圓光大學校 醫科學硏究所 1999 圓光醫科學 Vol.15 No.2

Background: Thioredoxin peroxidase(TPX) is a kind of recently discovered antioxidant enzyme which react as rapid hydrogen ion donor for the removal of hydroperoxide. The action and distribution of the TPX was poorly understood in the human diseases. This experiments were designed for the study about the distribution of the TPX in the chronic granulomatous inflammation and about the correlation between the expression of TPX and the site of inflammation, histological activities of tuberculous inflammation or existence of mycobacterium in the inflammatory foci. Methods: The immunohistochemical stains were performed for the localization of the TPX-2 in the epithelioid cells, giant cells and lymphocytes in the chronic granulomatous inflammation. The tissue sections were obtained from the paraffin blocks of the 54 cases of tuberculosis (lung 21 cases, lymph node 12 cases, bone and soft tissue 12 cases, kidney 9 cases; active 33 cases, inactive 21 cases by the histologic classification; presence of mycobacterium 15 cases, no mycobacterium 39 cases by PCR reaction). Results: The expression of TPX-2 was 16.7% in the giant cells, 27.8% in the epithelioid cells and 100% in the lymphocytes of tuberculous inflammations. The expression of TPX-2 in the giant cells and epithelioid cells of the tuberculosis were 28.6% and 57.1% of the pulmonary tuberculosis; 33.3% in each cells of the renal tuberculosis; 0% in each cells of the lymph node or bone and soft tissue tuberculosis. The expression of TPX-2 in the giant cells and epithelioid cells were 9.1% in each cells of the active tuberculosis and were 28.6% and 57.1% in each cells of the inactive tuberculosis by histologic classification. The expression of TPX-2 in the giant cells and epithelioid cells was 40% in each cells of tuberculosis which mycobacteria were detected and the expression of TPX-2 was 7.7% and 23.1% in each cells which mycobacteria were not detected by PCR reaction in the paraffin embedded tissue. Conclusions: The above results were summarized that the TPX-2 in the giant cells and epithelioid cells were more frequently expressed in the inactive tuberculosis than in the active tuberculosis. These results suggest that the TPX-2 is a kind of regulating or suppressing factors in the activity of the tuberculosis.

Al₂O₃纖維 强化 알루미늄 複合材料에서 合金元素 添加가 界面反應에 미치는 影響

金錫胤,宋在京,金政根 弘益大學校 1986 弘大論叢 Vol.18 No.2

In the fabrication of the fiber reinforced aluminum alloy composites was made by liquid metal vacuum infiltration. Emphasis was placed on the study addition of alloying elements to matrices and interface interactions between fiber and matrices. Al₂O₃fiber well wetted in Al-Mg, Al-Li and poorly in Al-Cu-Mg alloys but pure Al and Al-Cu matrices bad wetted. The distribution of constituents at the interaction zones between reinforcements and matrices was analysed by EDS and WDS.

양돈폐수로부터의 수소 생성 특성

장영복,정태영,차기철,정형근,김성헌,김동진,유익근 한국물환경학회 2004 한국물환경학회지 Vol.20 No.4

The characteristics of H₂ production from livestock wastewater were investigated through an anaerobic acid forming process using Clostridium beijerinckii and the photosynthetic process using Rhodobacter sphaeroides. The submerged separation membrane was installed in the acid forming reactor. The photosynthetic process is composed of two reactors(photosynthetic reactor 1 and photosynthetic reactor 2) which is connected continually. The removal rate of COD and the production of volatile fatty acid(VFA) in the acid forming process were approximately 50% and 1000㎎/ L, respectively. The 70% of COD in the effluent of acid forming process was removed through the photosynthetic process. The production of H₂ in the photosynthetic reactor 1 and 2 was 50 and 25mLH₂/gVFA_(COD), respectively. The values of Y in acid forming reactor, photosynthetic reactor 1 and 2 was 0.2263, 0.0601 and 0.0393, respectively. The acetic acid and butyric acid produced in acid forming process were converted to H₂ by photosynthetic bacteria.

도심지 가로수 식재를 위한 토양구조의 구성

김석진,M. Krieter,정재춘,정형근 한국환경과학회 1995 한국환경과학회지 Vol.4 No.2