• Steel and Composite Structures
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• 제23권6호
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• pp.727-736
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• 2017

The application of carbon fiber reinforced polymer (CFRP) in steel structures primarily includes two categories, i.e., the bond-critical application and the contact-critical application. Debonding failure and buckling failure are the main failure modes for these two applications. Conventional electrometric techniques may not provide precise results because of the limitations associated with single-point contact measurements. A nondestructive full-field measurement technique is a valuable alternative to conventional methods. In this study, the digital image correlation (DIC) technique was adopted to investigate the bond behavior and buckling behavior of CFRP-steel composite members. The CFRP-to-steel bonded joint and the CFRP-strengthened square hollow section (SHS) steel column were tested to verify the suitability of the DIC technique. The stereo-DIC technique was utilized to measure continuous deformation. The bond-slip relationship of the CFRP-to-steel interface was derived using the DIC data. Additionally, a multi-camera DIC system consisting of four stereo-DIC subsystems was proposed and applied to the compressive test of CFRP-strengthened SHS steel column. The precise buckling location and CFRP delamination of the CFRP-strengthened SHS steel column were identified. The experimental results confirm that the stereo-DIC technique can provide effective measurements for investigating the behaviors of CFRP-steel composite members.

• KEPCO Journal on Electric Power and Energy
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• 제6권4호
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• pp.447-454
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• 2020

Since SF₆ gas was discovered in the early 1900s, it has been widely used as an insulation material for electrical equipment. While various indicators have been developed to diagnose oil-immersed transformers, there are still insufficient indicators for the diagnosis of gas-insulated transformers. When necessary, chemical diagnostic methods can be used for gas-insulated transformers. However, the field suitability and accuracy of those methods for transformer diagnosis have not been verified. In addition, since various types of decomposition gases are generated therein, it is also necessary to establish appropriate analysis methods to cover the variety of gases. In this study, a gas-insulated transformer was diagnosed through the analysis of decomposition gases. Reliability assessments of both simple analysis methods suitable for on-site tests and precise analysis methods for laboratory level tests were performed. Using these methods, a gas analysis was performed for the internal decomposition gases of a 154 kV transformer in operation. In addition, simulated discharge and thermal fault experiments were demonstrated. Each major decomposition gas generation characteristics was identified. The results showed that an approximate diagnosis of the inside of a gas-insulated transformer is possible by analyzing SO₂, SOF₂, and CO using simple analysis methods on-site. In addition, since there are differences in the types of decomposition gas generation patterns with various solid materials of the internal transformer, a detailed examination should be performed by using precise analysis methods in the laboratory.

• 한국멀티미디어학회논문지
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• 제22권12호
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• pp.1385-1395
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• 2019

In this paper, we propose a method to fabricate a patient-specific breast implant using MRI images and 3D scan data. Existing breast implants for breast reconstruction surgery are primarily fabricated products for shaping, and among the limited types of implants, products similar to the patient's breast have been used. In fact, the larger the difference between the shape of the breast and the implant, the more frequent the postoperative side effects and the lower the satisfaction. Previous researches on the fabrication of patient-specific breast implants have used limited information based on only MRI images or on only 3D scan data. In this paper, we propose an algorithm for the fabrication of patient-specific breast implants that combines MRI images with 3D scan data, considering anatomical suitability for external shape, volume, and pectoral muscle. Experimental results show that we can produce precise breast implants using the proposed algorithm.

• 한국정보과학회논문지:소프트웨어및응용
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• 제30권7_8호
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• pp.713-718
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• 2003

조건부 밀도 전파(Condensation)는 강건한 추적 성능과 실시간 구현이 가능하다는 장점을 지닌다. 그러나 정확한 추적을 수행하기 위해서는 복잡한 형태 모델과 많은 수의 샘플을 요구하므로 현실적으로 실시간 다중 추적에 적합하지 않은 경우가 많다. 본 논문에서는 실시간 응용에 적합하도록 작은 탐색 공간을 갖는 이산 형태의 형태 모델과 다중 추적 시각 추적기간의 상호 경쟁 관계를 고려하여 적은 수의 샘플로도 좋은 추적 성능을 보이는 경쟁적 Condensation 알고리즘을 제안한다. 실험 결과, 제안한 경쟁적 추적 알고리즘은 복잡하게 이동하는 여러 군중을 실시간으로 강건하게 추적함을 보인다.

• 한국정보과학회논문지:소프트웨어및응용
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• 제32권6호
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• pp.473-485
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• 2005

UML(Unified Modeling Language) 액티비티 다이어그램은 시스템의 동적인 측면을 표현하는데 적합하기 때문에 비즈니스 프로세스와 워크플로우를 모델링하는데 유용하게 사용된다 그러나 워크플로우 시스템에서 중요시 되는 시멘틱 정보 표현의 경우 OMG가 제공하는 UML 액티비티 다이어그램에 대한 시멘틱 정보를 표현하기 위한 지침만으로는 정확한 시멘틱 정보의 표현이 어렵다. 이에 본 논문에서는 워크플로우 시스템의 특성에 맞도록 ASM(State Machine) 시멘틱을 확장한 후 액티비티 다이어그램에 적용하여 워크플로우 시스템을 모델링하는 방안을 제시한다. 이와 같은 ASM 시멘틱을 기반으로 하는 정형적인 시멘틱에 대한 정확한 정의를 통하여 보다 효율적인 워크플로우 모델링이 가능하다.

• The Plant Pathology Journal
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• 제40권3호
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• pp.290-298
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• 2024

K-Maryblyt has been developed for the effective control of secondary fire blight infections on blossoms and the elimination of primary inoculum sources from cankers and newly emerged shoots early in the season for both apple and pear trees. This model facilitates the precise determination of the blossom infection timing and identification of primary inoculum sources, akin to Maryblyt, predicting flower infections and the appearance of symptoms on various plant parts, including cankers, blossoms, and shoots. Nevertheless, K-Maryblyt has undergone significant improvements: Integration of Phenology Models for both apple and pear trees, Adoption of observed or predicted hourly temperatures for Epiphytic Infection Potential (EIP) calculation, incorporation of adjusted equations resulting in reduced mean error with 10.08 degree-hours (DH) for apple and 9.28 DH for pear, introduction of a relative humidity variable for pear EIP calculation, and adaptation of modified degree-day calculation methods for expected symptoms. Since the transition to a model-based control policy in 2022, the system has disseminated 158,440 messages related to blossom control and symptom prediction to farmers and professional managers in its inaugural year. Furthermore, the system has been refined to include control messages that account for the mechanism of action of pesticides distributed to farmers in specific counties, considering flower opening conditions and weather suitability for spraying. Operating as a pivotal module within the Fire Blight Forecasting Information System (FBcastS), K-Maryblyt plays a crucial role in providing essential fire blight information to farmers, professional managers, and policymakers.

• Mycobiology
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• 제48권4호
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• pp.276-287
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• 2020

An algific talus slope is composed of broken rocks with vents connected to an ice cave, releasing cool air in summer and relatively warmer air in winter to maintain a more stable microclimate all year round. Such geological features create a very unusual and delicate ecosystem. Although there are around 25 major algific talus slopes in Korea, lichen ecology of these areas had not been investigated to date. In this study, we report the first exploration of lichen diversity and ecology at an algific talus slope, Jangyeol-ri, in Korea. A total of 37 specimens were collected over 2017-2018. Morphological and sequencing analysis revealed 27 species belonging to 18 genera present in the area. Of particular interest among these species was Solorina saccata, as it has previously not been reported in Korea and most members of genus Solorina are known to inhabit alpine regions of the Northern Hemisphere. We provide here a taxonomic key for S. saccata alongside molecular phylogenetic analyses and prediction of potential habitats in South Korea. Furthermore, regions in South Korea potentially suitable for Solorina spp. were predicted based on climatic features of known habitats around the globe. Our results showed that the suitable areas are mostly at high altitudes in mountainous areas where the annual temperature range does not exceed 26.6 ℃. Further survey of other environmental conditions determining the suitability of Solorina spp. should lead to a more precise prediction of suitable habitats and trace the origin of Solorina spp. in Korea.

• 대한기계학회논문집B
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• 제40권10호
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• pp.629-636
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• 2016

미세 회로 기판 제조에 적용되는 습식공정 중 도금조에서 미세 기판의 정밀한 가공을 위해 산성용액 반응조 내부의 유동특성을 관찰하는 것이 중요하다. 하지만, 상용 유속계 중 내산성을 갖춘 센서가 거의 없어 측정이 매우 어렵다. 본 연구에서는 내산성을 갖는 압저항 센서에 신호처리 기술을 적용하여 유속을 측정할 수 있는 센서를 개발하였다. 상용유속계 수준의 유속데이터 획득을 위해서는 높은 임피던스를 갖는 압저항 센서에 증폭회로 및 저역통과필터를 부착하였으며, 이 때 사용되는 신호처리회로의 출력과 상용유속계의 출력이 일치되도록 하는 신호처리회로의 선정을 위해 Butterworth, Bessel, Chebyshev 필터 회로를 제작하여 유속 측정을 통해 출력을 상용유속계의 출력과 비교한 결과 0.0128 %, 0.0023 %, 5.06 %의 MSE를 확인할 수 있었다. 인가 유속을 변경하면서 내산성 센서의 측정 가능 영역을 확인해 본 결과, 저속 저압 구간에서는 신호와 노이즈 구분이 어려워 신호 처리 알고리즘을 적용해도 원하는 결과를 얻지 못하였고, 2~6 m/s에서 2.7 % 미만의 오차를 갖는 신뢰성 있는 측정이 가능하였다.

• 대한한방종양학회지
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• 제9권1호
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• pp.39-46
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• 2003

Objectives : The former study of Oriental Medicine on cancer has been mostly focused on lab studies with herbal medicine. Among this atmosphere, the aim of this study is to investigate the suitability of Oriental Medicine institutions to participate in cancer registry programme in R.O.K by investigating the type of treatments used for cancer patients in Oriental Medicine institutes. Methods : To investigate the actual conditions of cancer patients who visited Oriental Medicine institutes, a survey was done based on clinical charts of 258 patients of cancer. Results : The order for the percentage of the original tumor organ of the patients, the number of patients who recognized the outbreak on the year of the first visit was the biggest, and the number gradually decreased while the years passed. For the type of treatment, herbal medicine was the most for 92.6%, acupuncture 52.6%, moxibustion 16.7%, cupping 14.7%. It can be seen that multiple treatment was preferred to single treatment. Among the periods for herbal medication, 10 days was the most for 34.1%, 29.8% for within 50 days and 10.5% for within 100 days. The percentage of patients who took treatment of western medicine at the same time and those who took treatment of Oriental medicine only was 47.4% and 43.8% respectively. By surveying categories such as the symptoms, diagnosis of syndrome, principle of treatment from the chart by a free description, there was 841 names of symptoms, 207 diagnoses of syndromes and 206 principles of treatment. But no relation or connection between these could be found statistically. At there were even occasions which the doctor didn't record the cancer itself, precise investigatio for the actual condition of cancer patients in Oriental Medicine institutions appeared to be very difficult. Conclusions : It seems impossible to enroll cancer patients of Oriental Medicine institutions to the cancer registry programme in R.O.K as far as the patients are recorded only under the paradigm of Oriental Medicine. However, if the Oriental Medicine doctors keep a consistency in classifying categories such as cause of death, syndrome diagnosis, principle of treatment and prescriptions, and limit the choices, for each category, a pilot study for cancer registry programme in R.O.K. in Oriental Medicine could be carried out.

• 한국산림과학회지
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• 제88권3호
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• pp.389-399
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• 1999

본 연구는 개체목의 위치를 포함하는 정밀 임분조사 자료를 이용하여 임분의 3차원 공간구조 분석이 가능한 컴퓨터 프로그램의 개발을 목적으로 수행되었다. 이 프로그램은 임분의 ha당 통계량 계산 등 양적 정보뿐만 아니라 직경, 수고, 재적분포, 그리고 3차원 임분 공간구조와 수관투영도 등의 시각적 정보를 제공하는 기능을 가지고 있다. 또한 컴퓨터 상에서 가상 시업 시뮬레이션을 통해 시업후의 임분구조를 시각적으로 확인할 수 있는 기능을 포함한다. 본 연구에서 개발된 프로그램의 통계분석 부분은 SAS의 분석결과와 비교하였고, 그래픽 정보의 표현 능력은 유사한 3차원 수관도 프로그램인 TreeDraw와 비교하였다. 그 결과 본 연구에서 개발된 프로그램은 자료분석 시간이나 결과의 요약 등 실용성 측면에서 우수한 것으로 나타났다. 본 프로그램을 이용할 경우 해당 임분에 대한 적합한 조림조치와 합리적인 경영에 필요한 다양한 임분 공간정보를 얻을 수 있어 사용자의 의사결정에 도움이 될 것으로 판단된다.