선물환시장을 이용한 환위험관리 : 이변량 ECT-ARCH(1)모형을 중심으로

문규현,-- 한국금융학회 2003 金融學會誌 Vol.8 No.2

본 연구에서는 국내선물환(Forwards)을 이용한 원·달러현물환율 변동위험에 대한 헤지성과를 분석하였으며 주요 연구결과는 다음과 같다. 첫째, 최적헤지비율 추정결과, 최소분산헤지비율 및 이변량 ECT-ARCH(1) 모형 모두 기간이 짧은 원·달러선물환율들의 헤지비율이 기간이 긴 원·달러선물환율을 이용한 헤지비율보다는 상대적으로 높은 것으로 나타났으며, 시간변동최적헤지모형이 최소분산 헤지모형이 헤지비율보다 상대적으로 높은 것으로 나타났다. 둘째, 헤지모형별 헤지성과 분석결과에 의하면, 내표본(within-sample) 및 외표본(out-of-sample)기간 모두 헤지비율이 시간이 경과함에 따라 변화하는 이변량 ECT-ARCH(1) 모형 및 이변량 ARCH(1)의 헤지성과가 단순헤지모형과 헤지비율이 일정한 것으로 가정하는 전통적 헤지모형인 최소분산헤지모형(minimum variance hedging model)보다 상대적으로 더 나은 것으로 나타났다. 셋째, 각 기간별 원·달러선물환의 헤지성과 분석 결과, 환율변동에 따른 원·달러 현물가격변동 위험을 헤지하기 위해서는 장기적인 원·달러선물환보다는 단기 선물환율을 이용한 헤지성과가 상대적으로 더 나은 것으로 나타났다. 따라서 우리나라 원·달러외환시장의 경우 단순헤지모형과 전통적인 최소분산헤지모형보다는 시간변동 최적헤지모형을 이용하는 것이 더 바람직한 헤지성과를 얻을 수 있으며, 장기보다는 3개월 미만의 단기선물환을 이용하는 것이 상대적으로 나은 결과를 보였다. This paper studies hedging strategies that use the Won-dollar forwards to hedge the price risk of the Won-dollar exchange rate. This study uses the minimum variance hedge model and bivariate ECT-ARCH (1,1) model as hedge models, and analyzes their hedge performances. The sample period covers from March 1, 2002 to March 31, 2003 with 7 sub-samples such as 1week, 1month, 3months, 6months, 9months, and 1year. The most important findings may be summarized as follows. First, the hedge ratios of short periods in 3months are relatively higher than those of long periods above 3months. Hedge ratios of the ECT-ARCH (1) tend to be higher than those of risk-minimization model. Second, for both the in-sample data and the out-sample, hedging effectiveness of ARCH (1) and ECT-ARCH (1) model is higher than that of the risk-minimization with constant hedge ratios. Third, the hedge effectiveness of short periods consistently tend to be higher than that of long periods. In conclusion, investors are encouraged to use the time varying hedge models like ARCH, ECT-ARCH model rather than simple risk-minimization model to hedge Won-dollar exchange rate with short periods forwards within 3months.

관동맥질환에서 저밀도 지단백 입자 크기의 분포

임효영,김인숙,승기배,강동헌,전두수,장기육,박준철,이수영,홍순조,최규보 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.8

심근경색 환자에서의 헤파린 사용시 장요근 혈종과 연관된 후복막강내 자발적 출혈 1예

김효정,김도연,황민규,조홍근 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.10

山査의 혈관이완작용 기전에 대한 연구

배명효,김규열 世明대학교 한의학연구소 2002 韓醫學硏究所 論文集 Vol.4 No.-

This study was undertaken to define the effect of Crataegi Fructus on the norepinephrine-induced arterial contraction and the mechanism of Crataegi Fructus-induced relaxation. In order to investigate the effect of Crataegi Fructus on contracted rabbit carotid arterial strips, transverse strips with intact or damaged endothelium were used for the experiment using organ bath. To analyze the mechanism of Crataegi Fructus-induced relaxation, Crataegi Fructus extract infused into contracted arterial strips induced by norepinehrine after treatment of indomethacin, N_(t) nitro-_L-arginine or tetraethylammonium chloride. Crataegi Fructus relax arterial strip with endothelium contracted by norepinephrine, but in the strips without endothelium, Crataegi Fructus-induced relaxation was significantly inhibited. The endothelium-dependent relaxation induced by Crataegi Fructus was decreased by the pretreatment of N_(t) nitro-_L-arginine, but it was not observed in the strips pretreated with indomethacin or tetraethylammonium chloride. We suggest that Crataegi Fructus may influx of extra-cellular Ca^++ through the formation of nitric oxide in the vascular cells.

표준말 및 어문관계 표기법 개정안의 문제점

김형규 세종대학교 세종대학 논문집 Vol.8 No.-

Ⅰ.Preface The Ministry of Education has determined the new forms for Standarized Korean, the rules for spelling, the rules for the Korean spelling of foreign words and the rules for the Romanization of Korean. It is now proposed to implement the new plan in the near future. Having served as a member of the planning committee, I am much concerned about the outcome. I would like to indicate here some problems which, I believe, make some of the innovations unsuitable. Ⅱ.Spelling Rules 1)I support the plan for rectifying the names for the han-gu¨l letters, e.g. ㄱ giu¨k, ㄷ diuˇt, ㅅ siu˘t. Therefore, I am opposed to the Hangu˘l Society's plan to keep the old names. 2)There are some problems in the rules for writing toinsori (strong sounds), e.g. 꼭대기-꼭때기, 색시-색씨 3)There are some spelling problems in connection with conveying the tymology of compound words, e.g. 반짓고리-반짇고리, 사흣날-사흗날 4)There are also some problems in conveying the etymology of the compound verbs in paragraph 14, e.g. 넘어지다, 떨어뜨리다. I think it is better to spell 너머지다. rather than 넘어지다 and 떠러뜨리다 rather than 떨어뜨리다. 5)It is not suitable to write -이오, -아니오, -시오. We should write -이요, -아니요, -시요, because this is the way we pronounce these words. 6)It is better to write 어름(ice) and 거른(manure) than to write 얼음, 걸음. 7)I think it is better to write 싫쯩(disgust) rather than to write 싫증. 8)It is better to write 피였다 (bloomed) and 되였다 (became) than to write 피었다, 되었다, because this is the way we pronounce these words. 9)There are some other problems with the orthographic rules: a)Words for measurements should be separated by spaces as independent words, e.g. 한두 치. Thus, I cannot agree with the proposal to write 한자 and 두치. b)I believe that it is better to write one's full name, separating the family name from the given name, e.g. 김 형규 c)There is also a problem with the separation of words. I think it is better to write 할것 than to write 할것. 10)It is better to permit the writing of “carefully”as either 꼼꼼히 or 꼼꼼이, because we may pronounce this word either way. Please note that there are some words in English for which two different spellings exist, e.g. armor or armour. Ⅲ.Standard Korean The standard language must be determined in accordance with the way young people speak rather than following the language of old people. 1-(2)There is a tendency to use stronger sounds in Korean. Therefore, it is better to spell 꼽추 (hunchback) rather than 곱추 and 쪽제비 (weasel) rather than 족제비, 2-(1)There is a pronounciation change by umlaut in modern Korean. Therefore, it is better to spell 아지랭이 (haze) rather than 아지랑이 and 올개미 (snare) rather than 올가미. 5.It is not certain that we have length in Korean. Therefore, we must discuss this problem further. Ⅳ.The Spelling of Foreign Words Length is a primary phoneme in European languages. Therefore, we must show this in speling words from these languages in Korean, e.g. part[pa:t]-파-트. card[ka:d]-카-트. The /r/ and /l/ are different phonemes in English. Therefore, we should write headlight 헤들라이트. Ⅴ.Romanization of Korean We must Romanize a word's final syllable in accordance with the morpheme rather than by pronunciation alone. Therefore, it is better to write 가랑잎 (oak leaf)-garangnip and 값(price)-gaps.

흰쥐의 방사선 피폭후 생물학적 지표로서의 혈액효소

김진규,김상복,김국찬,천기정,김인규,박효국,이강석 대한방사선 방어학회 1993 방사선방어학회지 Vol.18 No.2

생물학적 선량평가를 위한 생화학적 지표 연구로서 흰쥐 혈액내 효소활성도의 변화를 조사한 결과는 다음과 같다. 1) Alkaline phosphatase 활성도는 0.1, 0.25, 0.5, 2, 4 Gy의 방사선 조사후 24시간까지 혈액내 활성도가 증가하였고 72시간 경과시에는 대조군과 비슷한 활성도를 보였다. Creatine kinase는 2, 4 Gy 방사선 조사후 혈액내에서 활성도에서 활성도가 72시간까지 증가하였으나 0.1, 0.25Gy, 0.5 Gy 방사선 조사시에는 커다란 변화를 보이지 않았다. 2) Malate dehydrogenase 활성도는 0.1, 0.25, 0.5 Gy 방사선 조사시에는 커다란 변화가 없었으며 lactate dehydrogenase는 방사선 조사후 활성도가 감소하였다. 3) GOT의 활성도는 선량률 0.1Gy/min.로 0.1, 0.25, 0.5, 2, 4 Gy 조사후에는 어떠한 변화도 없었으며 선량률 0.5 Gy/sec.로 0.5, 1, 1.5, 2, 3, 5, 7 Gy로 조사후에는 증가현상을 보이고 있다. Acid phosphatase 활성도는 상기의 어떠한 선량에서도 나타나지 않고 있다. 잠재적으로 이러한 효소들은 방사선 피폭의 지표물질로 사용될 수 있으며 생화학적 지식과 기술을 이용한 좀더 나은 지표물질을 찾기 위하여 계속적인 조사가 필요하다. Enzyme activity changes in rat blood as biochemical indicator useful for evaluating exposure dose were experimentally studied. The experimental results obtained are as follows: 1) Alkaline phosphatase activities increased in the blood serum until 24 hours after 0.1, 0.25, 0.5, 2 and 4 Gy irradiation and its activities returned mormal condition after 72 hours of post-irradiation. Creatine kinase activities increased in the blood serum until 72 hours after 2 and 4 Gy irradiation but any significant activity changes were not detected after 0.1, 0.25 Gy irradiation. 2) Malate dehydrogenase activities did not reveal available changes changes after 0.1, 0.25, 0.5 Gy irradiation and lactate dehydrogenase activities decreased in the blood serum after 0.1, 0.25, 0.5 Gy irradiation. 3) Glutamate oxaloacetate transaminase activity changes were detected in the blood serum after 0.1, 0.25, 0.5, 2, 4 Gy(0.1 Gy/min.) and GOT activities increased after 0.5, 1, 1.5, 2, 3, 5, 7 Gy(0.5 Gy/sec.). Any acid phosphatase activities were detected in the blood serum after 0.1, 0.25, 0.5, 2, 4 Gy(0.1 Gy/min.) and 0.5, 1, 1.5, 2, 3, 5, 7 Gy(0.5 Gy/sec.) irradiation. Potentially some of these enzymes can be used as indicator protein for radiation injury. Futher investigation is needed to find better biochemical indicatiors utilizing recent knowledge and techniques of biochemistry.

자가혈당측정기 Precision Q.I.D 평가

이수연,이성규,김종원,민원기,박효순 대한임상병리학회 1999 대한임상병리학회지 Vol.19 No.4

Suction Test를 이용한 부산점토의 시료교란 평가

정성교,김규종,제효성 東亞大學校 建設技術硏究所 2007 硏究論文集 Vol.30 No.2

Unusually thick and soft clay that called Pusan clay are distributed over the Nakdong River deltaic plain. Since the early 1990s, a large number of geotechnical investigation have been performed for reclamation works, which are to develop new lands for new port, road, residential and industrial complexes, etc in the plain. Sample disturbance on Pusan has been always become a disputable issue for the projects, because the geotechnical properties were extremely underestimated. Simultaneously with some efforts that minimize the sample disturbance, the possible causes and assessment of sample disturbance were necessary on the clay. Although there are several methods for assessing sample quality on clays, an attempt was made with suction measurement for this study. A careful attention was paid to retrieve samples from the ground at three locations and then suction testing was conducted. The measurement of suction pressure that were performed at the locations were analyzed with depth, which is to examine the intrinsic soil features. Their sample disturbance were also evaluated using the results, based on the methods that were proposed by Ladd and Lambe (1963) and Nelson et al (1971). In addition, correlations were performed using other soil properties.

빌트인 모터를 이용한 2축 제어 미세 가공기 개발

김건희,김효식,양순철,이상용,국명호,이선규,김윤중,홍권희 한국공작기계학회 2007 한국공작기계학회 추계학술대회논문집 Vol.2007 No.-

This paper describes development of low cost precision machine that has combined the Build-in Motor with a vacuum chuck. This study mainly aims to find out a cutting condition for maintaining optimum surface condition and to examine cutting characteristics of the precision machine that is equipped by diamond bites. The cutting materials is Al alloy. Several experiments were carried out to find out the main factors that affect the surface roughness such as principal axis RPM(rotation per minute), feeding speed, and cutting depth. As a result, we obtain The optimum cutting condition of the developed precision machine.

양식 은어의 미포자충 감염예에 대한 병리조직학적 관찰

조병열,강형길,강효주,류갑민,이재영,박남규,허민도 한국어병학회 2003 한국어병학회지 Vol.16 No.1

1998년 9월 말경, 경남 지역의 양식 은어(Plecoglossus altivelis)에서 미포자충증이 발생하였다. 채집 당시, 하루 약 200마리씩의 폐사가 10일째 진행되고 있었으며 약 10%의 누적폐사율을 나타내었다. 병어는 입올림을 하거나 기면 상태에 있었으며, 대부분 체색흑화 및 복부팽만 소견을 보이고 있었다. 아가미, 아가미 뚜껑, 각종 내장, 복강벽 및 생식소에 직경 1~3㎜의 흰색 결절이 다수 형성되어 있었다. 감염 어종, 기생충의 형태 및 xenoma 분포 장기의 다양성에 근거하여 Glugea plecoglossi에 의한 감염증으로 추정되었다. 병리조직학적 검사를 실시한 결과, 광범위한 장기에 걸쳐 xenoma를 형성하고 있었으나 xenoma 인접조직에 변성 변화는 없었다. 아가미 새변, 비장, 두신 및 체신의 조혈영역에 심한 울혈 소견이 인정되었고, 간장, 심근 및 신세뇨관 국소에는 응고 내지 액화괴사 소견이 확인되었다. 따라서, xenoma의 인접조직에 대한 물리화학적인 영향보다는 xenoma형성 장기 및 조직에 야기된 국소 순환장애가 은어의 폐사와 직접적인 관련을 갖는 것으로 사료되었다. On September in 1998, a microsporidian infection was recognized in ayu, Plecoglossus altivelis, farmed on Kyongnam province of South Korea. Cumulative mortality was around 10% in 10 days. Infected fish which were piping for air near the surface of the water or in the asphyxic, lethargic condition revealed darkening of body and abdominal distention. Numerous whitish nodules up to 3㎜ in size were observed throughout most of body organs and tissues including gill, operculum, peritoneal wall and organs. Xenomas were also histologically confirmed in multiple internal organs with the evidences suggesting circulatory disturbance. Based on the morphology of spore and xenoma, and the distribution of xenomas in organs and tissues, this disease was diagnosed to be a microsporidiosis caused by Glugea plecoglossi. The mortality might be deeply related to the local circulatory disturbance by xemonas rather than the mechano-chemical effect of xenomas on adjacent tissues.