• Proceedings of the Korean Society of Veterinary Service Conference
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• 1994.04a
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• pp.133.2-133
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• 1994

• Proceedings of the Korea Water Resources Association Conference
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• 2003.05b
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• pp.691-694
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• 2003

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.10a
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• pp.19-20
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• 2013

겨울철에 우리나라 서해 및 서해안은 북서계절풍이 지배적이다. 지속성이 강한 계절풍은 선박의 안전운항과 기상재해에 큰 영향을 미친다. 이 연구에서는 30년간(1981-2010년)의 장기간의 데이터를 이용하여 우리나라 서해안에 있어서의 겨울철 계절풍의 변화를 분석하였다. 얻어진 결과는 다음과 같다. 우리나라 서해안의 인천, 군산 및 목포에 있어서의 풍속은 12월, 1월 그리고 2월에 공통적으로 시간의 흐름과 함께 약해지는 경향을 보인다. 풍속이 약해지는 정도는 특히 군산에서 크고 인천과 목포에서는 서로 비슷하다. 우리나라 남해안에 위치하는 통영의 경우는 시간의 흐름과 함께 오히려 풍속에 강해지는 변화 특성을 보여 서해안의 계절풍 변화와는 큰 차이를 보인다. 인천, 군산 및 목포 중에서 풍속이 가장 강한 곳은 목포이고, 그 다음은 군산, 인천의 순이다. 우리나라 서해안의 계절풍이 약해지는 것은 겨울철의 전형적인 서고동저형 기압배치의 변화 등에서 그 원인을 찾을 수 있을 것이다.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 1995.05a
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• pp.25-29
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• 1995

＊병인,신미양요(1866-1871) : 기선, 화륜선이 조선연안을 나타났음. ＜셔어먼호＞사건 ; 대동강 소항중 조선의 포화맞다 ＊강화도조약 (1876년) : 조선의 문호개방--서양선박에 의한 교이(인천,부산,원산 개항) 방곡령의 선포(1889)--일상인의 미곡반출(수탈) 기선, 해룡호둥 용선(조운-1886),인천-한강나루간 수운 수공업제 공장의 동력도입(정미소-중기동력의 효시-1889) 형식 ; 석구식, 기계식(중략)

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2014.06a
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• pp.46-48
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• 2014

The port of Incheon is very famous of strong current and many curved fairway with exist of many islands around the fairway. Therefore the max size of calling vessel is restricted in 50K DWT with 13.0m draft. However in the near future, half cargo loaded VLCC will call SK energy Dolphin berth for discharging of crude oil. In this connection, this study will evaluate the safety of passing for Dongsudo-fairway by using the shiphandling simulation data that was produced by familiarized training & education for Incheon port pilots about VLCC's maneuvering characters and the fairway of Incheon port.

• Journal of the Korean Geotechnical Society
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• v.16 no.6
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• pp.23-33
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• 2000

인천국제 공항에 분포하는 해성세립토 지반에서 일련의 CPTU와 DMT를 실시하고 그결과로부터 구한 비배수전단강도($s_{u}$ ), 과입밀도(OCR), 압밀계수($c_{h}$) 등과 같은 지반 정수와 기존의 시험자료 등을 분석하여 두 시험 결과를 비교하였다. 이 분석에의하면, CPTU와 DMT 두시험은 모두 피에조콘 정수, $B_{q}$ )로 분류하여 점성토인 지반에서 보다 신뢰성이 높은결과를 주었으며, 또한 해석방법에 따라 지반정수 산정결과에 큰 편차를 보여, 적절한 해석방법의 선택이 신뢰성있는 지반정수의 산정을 위한 주요한 인자임을 알았다. 그리고, 소성적 성질이 낮은 세립토 지반에서의 CPTU와 DMT를 이용한 비배수전단 강도 또한 과압밀비의 산정은 상당한 오차를 유발할 수 있다고 판단되었다.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.46 no.3
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• pp.1-6
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• 2023

In the realm of dental prosthesis fabrication, obtaining accurate impressions has historically been a challenging and inefficient process, often hindered by hygiene concerns and patient discomfort. Addressing these limitations, Company D recently introduced a cutting-edge solution by harnessing the potential of intraoral scan images to create 3D dental models. However, the complexity of these scan images, encompassing not only teeth and gums but also the palate, tongue, and other structures, posed a new set of challenges. In response, we propose a sophisticated real-time image segmentation algorithm that selectively extracts pertinent data, specifically focusing on teeth and gums, from oral scan images obtained through Company D's oral scanner for 3D model generation. A key challenge we tackled was the detection of the intricate molar regions, common in dental imaging, which we effectively addressed through intelligent data augmentation for enhanced training. By placing significant emphasis on both accuracy and speed, critical factors for real-time intraoral scanning, our proposed algorithm demonstrated exceptional performance, boasting an impressive accuracy rate of 0.91 and an unrivaled FPS of 92.4. Compared to existing algorithms, our solution exhibited superior outcomes when integrated into Company D's oral scanner. This algorithm is scheduled for deployment and commercialization within Company D's intraoral scanner.

• Korean Journal of Remote Sensing
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• v.39 no.6_3
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• pp.1747-1761
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• 2023

Wetlands, defined as lands periodically inundated or exposed during the year, are crucial for sustaining biodiversity and filtering environmental pollutants. The importance of mapping and monitoring their topographical changes is therefore paramount. This study focuses on the topographical variations at the Incheon River estuary wetland post-restoration, noting a lack of adequate prior measurements. Using a multi-temporal Sentinel-1 dataset from October 2014 to March 2023, we mapped long-term variations in water bodies and detected topographical change anomalies using a pixel-frequency approach. Our analysis, based on 196 Sentinel-1 acquisitions from an ascending orbit, revealed significant topography changes. Since 2020, employing the pixel-frequency technique, we observed area increases of +0.0195, 0.0016, 0.0075, and 0.0163 km² in water level sections at depths of 2-3 m, 1-2 m, 0-1 m, and less than 0 m, respectively. These findings underscore the effectiveness of the wetland restoration efforts in the area.

• Journal of Advanced Navigation Technology
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• v.28 no.2
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• pp.225-231
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• 2024

In this article, a new approach is presented to improve the unchangeable function of a ready-made millimeter-wave antenna system. By designing a metamaterial surface appropriate for the given geometry and fixed electrical characteristics of the device, the properties of the radiated fields of the RF product are changed to have directivity and higher antenna gain. Unlike other designs using periodic metamaterials for a single patch, an aperiodic metasurface is developed to handle two patches. For a higher received signal strength and a longer RF path in the 24 GHz-radio link, an aperiodic metasurface enhances the radiated fields by 10 dB.

• Journal of Korea Water Resources Association
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• v.39 no.6 s.167
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• pp.521-531
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• 2006

The formula was proposed through the examination of probability rainfall intensity formula used in Incheon based upon recent occurrences of heavy rain and extraordinary storms. Random-time maximum annual rainfalls were estimated for durations from ten minutes to twenty-four hours from the data by Korea Meteorological Administration. Eleven types of probability distribution are considered to estimate probable rainfall depths for different storm durations at Incheon city. Three goodness-of-fit tests including Chi-square, Kolmogorov-Smirmov and framer Von Misses were used to analyze the tendency of recent rainfall. Considering maximum rainfall occurred, General Extreme Value(GEV) distribution was chosen as the appropriate probability distribution. Five types of probability rainfall formulas including Talbot type, Sherman type, Japanese type, unified type I and unified type II are considered to determine the best type for rainfall intensity at Incheon. The formula was determined considering the time of concentration of sewer system and river at Incheon city. Unified type I was chosen for its accuracy and was proposed to represent rainfall intensity of Incheon district.