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수중환경 변수의 변화에 따른 능동소나 표적검출 성능분석에 관한 연구
윤대희,이충용,성하종,박성범,정형성 연세대학교 산업기술연구소 1997 논문집 Vol.29 No.2
In this paper, the performance of active sonar system is analyzed under various underwater acoustic environments using the multipath eigenray model in shallow water. In addition, an approximated shallow-water propagation model is proposed for the active sonar based on MacPherson and Daintith's model and corresponding equations comprising active sonar parameters are derived. To analyze the sonar performance according to the changes of various sonar parameters, a large number of measurements and results in ocean acoustics and digital signal processing are combined. The proposed model is compared with the multi-path eigenray model in terms of the echo level passed through the beamformer, the input SNR of the detector and the detection probability.
Symptoms of North Korea`s Economic System: Now is the Time to Open up Economically
( Youn Sik Choi ),( Hyung Rok Jung ),( Sung Man Yoon ) 한국국방연구원 2013 The Korean Journal of Defense Analysis Vol.25 No.1
Since suffering economic difficulties, particularly from the 1990s onwards, North Korea, even implicitly, has taken several actions based on the nature of its limited market economy system. North Korean scholars seem to have attempted to practice economic reform and a more open-door policy by learning the capitalistic mark eteconomy system. This paper investigates the current state of trends of North Korean studies associated with economics and management. It is found that even though directly praising and idolizing "Kim Il Sung" and/or "Kim Jong Il" are consistently accomplished, studies on new and subtle issues such as an open-door policy, the global (international) monetary system, compensation, wage (salaries),and self-financing (financing a giupso, in itself, without external financing such as borrowing or issuing shares) drastically increased in the 2000s, especially before and after the announcement of the ``7.1 Economic Management Improvement Measures`` implemented in July 2002. This paper`s findings suggest that North Korea has tried to learn capitalistic market economy system before it takes any steps regarding economic reform. This paper also identifies the political implications in drawing up initiatives in preparation for the era of unification of the two Koreas.
규칙적 장기간 운동이 성인여성의 골밀도 함량, 최대 산소섭취량과 각신전력 변화에 미치는 영향
윤성원,강영석,나윤수 서울여자대학교 자연과학연구소 1996 자연과학연구논문집 Vol.7 No.-
The purpose of this study was to examine the effect of organized walking (n=9) and badminton exercise (n=9) on bone density, maximal oxygen consumption, and leg extensor intake during 6-month period of experiment with middle-aged women(48-56 years). Subjects (n=18), regularly participating to a social sport oenter, were practiced an assigned exercise 3 times a week and measurements were taken every 3-month. after the program being initiated Bone density was measured by DEXA method, VO?? by a rpogressive work load exercise, and leg extensor by isokinetic equipment. The following results were obtained from data analyses : 1. For walking group, the 6-month exercise with a regular time interval resulted in an increase in the bone density of back lumber (L1-L4). On the other hand, for badminton group, an increase was shown in the bone density of head of thigh. 2. For both groups, les extensor was significantly increased over the 6-month experimental period. 3. Subjects in walking exercise group showed an significantly increased VO?? over the experimental period while badminton group did not. These conclusions suggest that an exercise prescriptor should design an exercise program such a way that it includes both a resistance training and aerobic exercise in order to increase bone density, which has a prevention effect against aging and bone fracture, as well as to enhance strength of leg muscle and VO??.
지상윤(Jee, Sang-Youn),김경수(Kim, Kyung-Soo) 한국국제회계학회 2020 국제회계연구 Vol.0 No.90
본 논문은 일반화 분산분해방법을 사용하고 신속하게 이용가능한 다변량 Markov 국면전환모형(MS)을 벡터자기회귀모형(VAR)과 결합하여 글로벌 금융시장 간의 변동성 전이지수를 분석하고자 하였다. 결과로 첫째, 단일 국면모형의 변동성 전이지수에 따르면, 유럽 금융시장은 타시장으로부터 영향을 받는 것보다는 더 영향을 미치는 시장이었고 한국과 일본은 타시장에 영향을 미치지 못하고 타시장으로부터 영향을 받는 시장으로 나타났다. 둘째, MS-VAR 모형에서 금융위기 동안 한국시장은 최대의 변동성을 보여주었고 한국은 선진국과의 통합이 강화되어 타국가 간의 평균 및 분산이 현저히 급등하였고 한국, 미국 및 유럽 간의 강력한 선도-지연 상호작용이 존재하였다. 셋째, MS-VAR 모형하의 변동성 전이지수에 따르면, 혼란기(2-국면)에서 한국, 프랑스 및 일본은 타시장의 변동성 충격에 의해 더 크게 영향을 받는 정도가 단일 국면모형의 결과와 거의 동일하였으나, 미국의 경우, 변동성 충격을 통해 파급된 총전이지수는 가장 높아 타시장의 금융 어려움에 현저하게 영향을 미쳤다. 넷째, 평활화 국면확률에서 금융위기 동안 글로벌 금융시장간의 국제적 통합과 이와 연계된 구조적 변화를 보여주었다. 따라서 MS-VAR 모형을 통해 한국을 포함한 8개의 금융시장의 변동성 전이지수와 이를 바탕으로 혼란기 동안의 강력한 전이효과와 안정기 동안의 완화된 전이효과를 파악할 수 있는 글로벌 금융시장 간의 변동성 전달 메커니즘을 이해할 수 있었다. This paper aims to incorporate the multivariate Markov regime switching model (MS) with the vector autoregressive model (VAR), and analyzing the volatility spillovers index between global financial markets. As a result, first, according to the spillovers index of the single regime model, European financial markets were more affected than other markets, and Korea and Japan had no influence on other markets but were affected by other markets. Second, in the MS-VAR model, the Korean market showed the highest volatility during the financial crisis, Korea strengthened its integration with developed countries, significantly increased the mean and variances among other countries, and strong lead-lag interactions between Korea, the United States, and Europe. Third, in the spillovers index under the MS-VAR model, Korea, France, and Japan were more affected by volatility shocks in other markets, which was almost the same as that of the single regime model in the turbulent period (2-regime). Specifically, in the United States, the total spillovers index through the volatility shocks had the greatest impact on the financial difficulties of other markets. Fourth, the probability of smoothing regime showed the integration and structural changes linked to global financial markets during the financial crisis. Therefore, the MS-VAR model has helped us understand the volatility spillovers index and the mechanisms of volatility spillovers to detect the strong spillovers effect among global financial markets including Korea during the chaotic period.
Chung, Sung Yun,Kim, Sunyoung,Lee, Ju‐,Hyuck,Kim, Kyongjun,Kim, Sang‐,Woo,Kang, Chong‐,Yun,Yoon, Seok‐,Jin,Kim, Youn Sang WILEY‐VCH Verlag 2012 ADVANCED MATERIALS Vol.24 No.45
<P>An all‐solution‐processed flexible piezoelectric nanogenerator, composed of polycrystalline ZnO thin film and functional polymer layers such as P3HT/PCBM and PEDOT:PSS, generates energy through a mechanical rolling and muscle stretching system. On page 6022, Youn Sang Kim, Sang‐Woo Kim, and co‐workers show that this all‐solution‐processed nanogenerator is feasible as a piezoelectric patchable device and is promising for use in future energy harvesters such as wearable human patches and mobile electronics. </P>
박지훈,이상혁,김희,이재호,박성재,지삼룡,양성연,박은택,이연재,설상영,정정명,강미선 白中央醫療院 2005 仁濟醫學 Vol.26 No.1
Fungus such as Candida albicans is a normal flora that is frequently found in the oral cavity, gastrointestinal tract, genitourinary tract, vaginal mucosa in a normal person. However, candida can cause opportunistic infection in an immune compromised host. Candidiasis has broad spectrum of disease from mucocutaneous infection to invasive or disseminated infection. But, it is rarely reported that candida is associaed with gastrointestinal tract disease in a healthy adult. The case of gastric ulcer associated with candida particularly in a health adult is reported with relevant literature.
윤정수,박상운 濟州大學校 基礎科學硏究所 1998 基礎科學硏究 Vol.11 No.2
본 연구는 제주도 백록담 담수호에서 해안변 용천수에 이루는 고도별로 대표적인 55개 용천수에 대한 지역적 수질특성과 그 진화과정을 연구하였다. 조사지역 55개 용천수의 수질분석 결과 관음사물은 수소이온농도에서 유수암천, 장수물, 덕지샘물, 신촌큰물, 영천사, 운량천, 하원통물, 동해물, 색달생수, 안덕계곡, 화손곤물, 돗물, 화강물, 정금물은 주변 육상오염원들에 의하여 삼양제3수원, 신촌큰물, 명법사, 서느렁물, 토산물, 정금물, 곽지물, 애월하물, 고내물, 녹고물은 해수침입에 의해 오염이 진행중인 용천수들로 분류되었다. 용천수내의 전기전도도, pH, 질산성질소, 중탄산이온은 강수량이 많았을때 그 농도가 증가하였으며, 나트륨, 염소이온, 황산이온은 강수량이 많았을때 그 농도가 감소하였고, 칼륨과 마그네슘, 칼슘은 영향이 미미하였다. piper의 삼각다이어그램을 통한 조사지역 용천수의 수질특성을 보면 고산지역은 Sodium or Potassium type의 군을 형성하였으며, 저지대지역은 No dominant type과 Sulfate or Nitrate type의 군을, 해안지역은 Sodium or Potassium type과 Chloride type및 No dominant type의 복잡한 용천수군을 형성하고 있었다. 즉 제주도 용천수는 해발고도가 높은 고산 및 중산간지역에서는 bicarbonate type이 우세한 수질조성에서 저지대 및 해안지역으로 유동되면서 non-bicarbonate type형태의 수질로 변질되어가고 있었다. This study purposes to clucidate the characteristics of local water quality and the cvolutional process of the spring water have been studied with the samples from 55 selected springs, from the coast region to the Baegogdam, a caldera lake of Halla mountain in Cheju Island. Results of hydrochemical analyses in the 55 spring water show that Gwaneumsa is polluted with high hydrogen concentration, and spring waters from Yusuamchun, Jangsumul, Andukkyekok, Dotmul, Konmul, Harkangmul and Junkeummul are polluted by the pollution sources from the surface surrounding ground. Spring waters of Samyng3suwon, Meungbusa, Semurungmul, Tosanmul, Jungkeummul, Kwakgimul, Aewolharmul, Konemul and Nokgomul are also polluted from the sea water intrusion. The electrical conductivity, pH and the concentration of nitrate nitrogen and bicarbonate increase when the precipitation increases, but the concentration of sodium, the concentration of sodium, chloride and sulphate decrease when the precipitation. Quality characteristics of spring water show complicated group of spring water through piper's trilinear diagram. The high mountain region consists of groups of sodium or potassium type and bicarbonate type; the middle mountain region consists of groups of sodium or potassium type and no dominant type; the low mountain consists of groups of no dominant type and sulfate or nitrate type; the coast region consists of groups of sodium or potassium type and chloride type or no dominant type. These characteristics indicate that the spring waters are changed from bicarbonate type in the high and middle mountain regions into non-bicarbonate type in the coastal region, as the precipitated waters flow downslope.
윤승환,조준,문창택,장상근 건국대학교 의과학연구소 2000 건국의과학학술지 Vol.10 No.-
To determine which factors influence the successful results in the patients who underwent lumbar arthrodesis with TFC(threaded fusion cage) at L34 to L5S1 intervertebral space. 20 subjects were analysed in retrospective method. Between January 1997 and April 1998, interbody fusion with TFC was undergone on 20 patients, and among them, 19 patients(95% ) were confirmed to have bone fusion at 12 months after operation. All patients were classified into group A(satisfactory results) and group B(unsatisfactory results) according to comprehensive low back questionnaires from their answer. They were checked with reference to intervertebral disc height and scoliotic, and lordotic angle with Cobb's method in the anterioposterior and lateral lumbar spine films before/after operation, and TFC diameter and length were categorized. In group A, 11 cases(55%) of "excellent" results and 5 cases(25%) of "good" results were included. In group B, 2 cases(10%) of "fair" results and 2 cases (10%) of "poor" results were included. In the lateral projection of group A and B. the mean preoperative disc height were 9.88±2.69mm and 10.45±2.39mm. Twelve months after operation, the mean disc height of group A was significantly increased to 14.11±2.14mm, but that in group B was not significantly increased only to 11.50±2.52mm. Preoperatively, the measured scoliotic and lordotic angles between L1 and S1 by Cobb's method were similar in both groups, being 4.18±3.58 and 26.75±6.64 degree in the group A, 3.50±2.65 and 33.25± 13.10 degreee in the group B. Twelve months after operation, the angles for group A were significantly improved to 0 and 48.13±11.83 degree, but in group B, not changed into 4.50±4.79 and 33.75±10.31 degree. The mean diameter and length of TFC in group A were, in each, 15.62± 1.09mm and 24.44±2.39mm but, 12.50±1.00mm and 21.00±0.00mm in those of group B. For successful results after TFC interbody fusion in the lower lumbar spine, recovery of narrow disc space, scoliosis, lordosis accompanied by solid arthrodesis were necessary. The authors propose that relatively larger-sized TFC should be profitable for those cases.