• 한국해안해양공학회지
• /
• 제4권2호
• /
• pp.130-137
• /
• 1992

전회의 인천만 2차원 모형(최, 1950)을 개선시켜 개방경계에 8개분조를 부여함으로서 만전체에 조석을 실시간예보할 수 있는 체계구성을 위한 시도를 하였다. 기상영향이 없는 기간에 대한 모형의 hindcast 결과는 치안관측치와 전반적인 일치를 보였다. 또한 인천만 모형과 1차원 한강모형을 동적 연결하여 한 모형체계로서 개선시켜 인천만 조석의 한강으로의 전파를 산정하게 하였다. 이 모형에 의해 1990년 9월의 대홍수를 산정하였으며 추후의 모형개선에 관연된 토의를 서술하였다.

• 자원환경지질
• /
• 제31권4호
• /
• pp.339-347
• /
• 1998

The purpose of this study is to find P-wave crustal velocity structure and the Moho characteristics beneath Seoul (SEO) and Inchon (INCN) stations using broadband teleseismic records. The use of broadband receiver function analysis is increasing to estimate the fine-scale velocity structure of the lithosphere. The broadband receiver functions are developed from teleseismic events of P waveforms recorded at Seoul (SEO) and Inchon (INCN) stations, and are analyzed to examine the crustal structure beneath the stations. The teleseismic receiver functions are inverted in the time domain of the vertical P wave velocity structures beneath the stations. The crustal velocity structures beneath the stations are estimated using the receiver function inversion method (Ammon et al., 1990). The general features of inversion results are as follows: (1) For the Seoul station, the Conrad and Moho discontinuities exist at 22 km and 30 km depth in the south ($BAZ=180^{\circ}$) direction. (2) For the Inchon station, the Conrad discontinuity exists at 22 km depth in the direction of SE ($BAZ=145^{\circ}$) and the Moho discontinuity exists at 30~34 km depth with a 4 km thick, which consists of a laminated velocity transition layers with thickness, whereas a crust-mantle boundary beneath the Seoul station consists of a more sharp boundary compared with the Moho shape of INCN station.

• 전기전자학회논문지
• /
• 제3권2호
• /
• pp.161-167
• /
• 1999

표준 2-poly CMOS 공정을 이용하여 3-입력 neuron-MOSFET의 인버터와 증가형 소자를 사용한 3비트 D/A 변환기를 설계 제작하였다. Neuron-MOSFET를 사용한 인버터의 전압전달 특성곡선과 잡음여유를 일반 CMOS 인버터와 같은 방법으로 측정분석하였다. 결합계수가 전압전달 특성곡선과 잡음여유에 미치는 영향을 이론적으로 계산하여 neuron-MOSFET 인버터의 게이트 산화층 두께와 입력게이트 레이아웃에 대한 설계 가이드라인을 설정하였다. 입력게이트 중 하나를 제어게이트로 사용하므로 offset전압이 없는 neuron-MOSFET D/A 변환기를 설계 제작할 수 있었다.

• 한국정보처리학회:학술대회논문집
• /
• 한국정보처리학회 2000년도 추계학술발표논문집 (상)
• /
• pp.493-496
• /
• 2000

국가 백년지계를 좌우하는 교육 분야 중에서도 특히 입시관련 분야는 우리나라의 독특한 풍토와 교육적 환경에 의하여 세계의 어느 지역보다도 국민적 관심은 지대하다. 그러나 제도교육권의 열악한 환경은 이러한 점을 뒷받침하지 못하고 있기에 점차 비생산적이고 비능률적인 교육 산업구조를 고착화하는 수준에까지 이를 것으로 판단된다. 또한 해마다 70만명 가량의 수험생들이 자신들의 성적 관리를 위하여 연간 4-5회 가량의 모의고사를 보고 있으며, 기존의 OMR 처리 과정을 통해 각각의 성적 분석 결과를 확인하는데 까지 적지 않은 시간을 보내야만 하는 불편함을 가지고 있다. 본 연구에서는 이러한 문제점을 해결하기 위하여 Off-Line을 통해 실시되는 모의고사를 인터넷이라는 가상공간에서도 병행하여 보다 빠르게 개인들의 성적 분석 결과를 제공하고 효과적인 성적 관리가 가능한 시스템 모델을 제안한다 제안된 시스템 모델은 시험보기 부분과 결과 확인 및 분석 부분을 둔다. 시험보기 부분에서는 출제된 시험 문제의 정답을 확인하고 결과 확인 부분에서는 처리된 정답 결과를 토대로 성적 관리를 할 수 있도록 다양한 형태의 데이터 포맷으로 분석 표현 할 수 있는 방법을 기술하였다.

• 한국항해항만학회:학술대회논문집
• /
• 한국항해항만학회 1999년도 추계학술대회논문집
• /
• pp.73-81
• /
• 1999

Inchon Port is the second largest import-export port of Korea, and has the point ant issue such as the excessive logistics cost because of the limits of handing capacity and the chronic demurrage. There is few research activities on the analysis and improvement of the whole port operation, because Inchon Port not only has the dual dock system and various facilities but also handles a various kind of cargo. The purpose of this paper is to develop the simulation program as a long-term strategic support tool, considering the dual dock system and the TOC(terminal operation company) system executed from March, 1997 in Inchon Port. The basic input parameters such as arrival intervals, cargo tons, service rates are analyzed and the probability density function for this parameters are estimated. The main mechanism of simulation model is the discrete event-driven simulation and the next-event time advancing. The program is executed based on the knowledge base and database, and is constructed using VISUAL BASIC and ACCESS database. From the simulation model, it is possible to estimate the demurrage status through analyzing scenarios such as the variation of cargo ton and cargo handing level, the increase of service rate, and so on, and to establish the long-term port strategic plan.

• Journal of KIEE
• /
• 제11권1호
• /
• pp.32-40
• /
• 2001

This paper presents the detailed statistics on radiation field signatures associated with multiple-intracloud lightning discharges. A transient signal recording system was used to measure the electric and magnetic fields produced by lightning flashes. The measurements were made in th summers of 1995 through 1999, and the location of the observation station was in Inchon on the coast of the Yellow Sea in Korea(37$^{\circ}$25'N, 126$^{\circ}$ 39'E). Most of lightning flashes typically contains between two and five strokes. The individual intracloud stork radiation fields were the bipolar pulse. On the average, the ratio of the peak of the second stroke to the first stroke peak was 75.1$\pm$40.1% for the negative, and a fraction of the subsequent stroke peaks were higher than the first stroke peak. The greater the number of the subsequent stroke order, less time separations between strokes were produced. The mean of the depth of the dip was 81.2$\pm$27.9% for the positive polarity and 75.9$\pm$24.4% for the negative. The depth of the dip increased for the positive bipolar pulses and decreased for the negative as the number of the stroke order increased.

• Biotechnology and Bioprocess Engineering:BBE
• /
• 제4권1호
• /
• pp.32-35
• /
• 1999

Addition of ${\beta}$-cyclodextrin (${\beta}$-CD) polymer during the biotransformation of digitoxin into digoxin using cell suspension cultures of Digitalis lanata enhanced the conversion yield. Digitoxin showed better adsorption to CD polymer compared to digoxin, so that the optimization of addition time was found to be necessary. In the case of adding CD polymer 24 hours after the feeding of substrate digitoxin, the highest digoxin production could be achieved. At this period, digitoxin was almost consumed by cells and productivity was proportionally enhanced according as the amount of substrate was increased. Immobilization of CD polymer did not promote the biotransformation. When 3.33 g/L of CD selective inclusion complex formation could be expected. Adsorption rate was found to be rapid and saturation was obtained within 10 hours of contact.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1999년도 하계학술대회 논문집 D
• /
• pp.1789-1791
• /
• 1999

In consideration of piezoelectric characteristic and Temperature stability, 3-element system dopped with NiO, $Cr_2O_3$ well-known as Hardner and Stabilizer whose primary element is PZT was eximanated its structure, piezoelectric characteristics, dopping with Nio, $Cr_2O_3$. We think that piezoelectric Characteristic is developed, remenent polarization and $E_c$ can developed in specimens by dopping with NiO, $Cr_2O_3$ additive. also, electromechanical quality factor largely showed tendency of decrement. According to dopping NiO, $Cr_2O_3$ more.

• 한국항해학회지
• /
• 제11권2호
• /
• pp.33-52
• /
• 1987

The disasters of wet bound vessels have been more frequent than those of east bound ones on the sea routes of the North Pacific Ocean in winter season. M/V Hanjin-Inchon was also west bound in her missing voyage. The container vessel of 17, 676 gross tons, M/V Hanjin-Inchon owned by Hanjin Shipping Co.Ltd in Seoul Korea left seattle in west coast of U.S.A for Pusan , Korea on the 5th Feb., 1987 and sailed along the exact courses recommended by Ocean Routes until she reported her position and speed as 49-30N, 158-00E and 8 knots to her head office in Seoul by this ship's time 2200 hours on the 13th Feb., 1987. The above message turned out to be last message from her because she had been missing since then leaving no message but only two life boats of her name, three containers cases, large scale of oil slicks and the corpse of her 3rd mate drifting on the sea near the position reported by her last message.

• 한국패류학회지
• /
• 제16권1_2호
• /
• pp.11-16
• /
• 2000

The electrophoretic banding patterns of 6-phosphogluconate dehydrogenase (PGD) in the two different chromosomal ploidy groups of Gyraulus were compared. The monomeric or dimeric banding patterns or allelic variations in a locus of PGD were observed in four diploid populations (Osan, Sohre, Kimpo and Kangwha) of G. convexiusculus occurring in Korea, whereas the isozyme banding patterns encoded by at least 3 different loci were shown in the tetraploid populations of G. (Torquis) groups collected from Michigan, the U.S.A. Of 3 different tetraploid groups, G. (T.) circumstriatus group showed 3 monomorphic isozyme banding patterns, and the other 2 populations showed some allelic variations. Such results provided good evidence to differentiate tetraploid subgenus Torquis group from the diploid Gyraulus populations.