• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1992년도 추계학술대회 논문집
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• pp.161-165
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• 1992

The important properties of industrial scale or weighing machine operated in production lines are quickness and precision. This paper presents an algorithm which meets the importance. The algorithm of Recursive Least Squares Regression is described for the weighing system simulated as a dynamic model of the second order. Using the model and the algorithm, model parameters and then the mass being weighed can be determined from the step input. The performance of the algorithm is illustrated in digital simulation. Discussions have been extended to the development of fast converging algorithm. It turns out that the algorithm shows several desirable features suitable for microcomputer assisted realtime signal processing.

• International Journal of Computer Science & Network Security
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• 제21권9호
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• pp.212-222
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• 2021

Multiple waves of COVID-19 highlighted one crucial aspect of this pandemic worldwide that factors affecting the spread of COVID-19 infection are evolving based on various regional and local practices and events. The introduction of vaccines since early 2021 is expected to significantly control and reduce the cases. However, virus mutations and its new variant has challenged these expectations. Several countries, which contained the COVID-19 pandemic successfully in the first wave, failed to repeat the same in the second and third waves. This work focuses on COVID-19 pandemic control and management in Saudi Arabia. This work aims to predict new cases using deep learning using various important factors. The proposed method is called Deep Learning and Dynamic Weighing-based (DLDW) COVID-19 cases prediction method. Special consideration has been given to the evolving factors that are responsible for recent surges in the pandemic. For this purpose, two weights are assigned to data instance which are based on feature importance and dynamic weight-based time. Older data is given fewer weights and vice-versa. Feature selection identifies the factors affecting the rate of new cases evolved over the period. The DLDW method produced 80.39% prediction accuracy, 6.54%, 9.15%, and 7.19% higher than the three other classifiers, Deep learning (DL), Random Forest (RF), and Gradient Boosting Machine (GBM). Further in Saudi Arabia, our study implicitly concluded that lockdowns, vaccination, and self-aware restricted mobility of residents are effective tools in controlling and managing the COVID-19 pandemic.

• 한국항만경제학회지
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• 제29권3호
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• pp.113-133
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• 2013

1995년 이후 한국기업의 유럽진출이 활발히 이루어졌으며, 특히 폴란드, 체코, 슬로바키아, 헝가리 등의 동유럽지역 진출은 두드러진다. 2011년 한-EU FTA 체결로 두 지역 간 경제적 관계는 더욱 밀접해졌다. 이러한 측면에서 항만을 가지고 있는 전통 유럽국가와 동유럽을 효율적으로 연결하기 위한 인터모달운송 선택에 관한 연구가 요청되고 있다. 하지만 유럽지역 수송수단 선택에 관한 연구는 아직 초보단계에 머무르고 있다. 본 연구는 현재 유럽지역의 인터모달운송의 현황을 파악하고, 열차와 트럭, 피더와 트럭 등의 인터모달운송선택의 핵심요인을 파악하며, 한국에서 유럽과 거래하는 수출기업 및 포워더 측면에서 고려할 때 주요하게 판단하는 요소의 가중치를 평가하는 것을 목적으로 하였다. In-depth interview는 2013년 4월에서 5월 사이 20년에서 30년 이상의 경력을 지닌 물류관련기업 사장단을 통하여 이루어졌다. 연구방법론으로 퍼지이론이 사용되었으며, 연구결과 도착의 신뢰도, 환적시간, 운임이 인터모달운송 선택시 가장 중요한 요인으로 선정되었다.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2000년도 추계 학술발표회 논문집 Proceedings of EESK Conference-Fall 2000
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• pp.251-260
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• 2000

Seismic performance evaluation systems require rational classification of structure systems, proper evaluation criteria, and their scoring index for synthesis. Current seismic performance systems need expert judgments based on collection of available data, approximate analysis of important items, and various scoring system. This study presents a three-step seismic performance evaluation system for building structures in Korea. Each evaluation step determines the seismic performance and the method depends on the degree of refinement of analysis. The preliminary step evaluation involves the global attributes of structures such as vertical irregularity, asymmetric plan, redundancy, and age of structures. The second step requires an elastic analysis for estimation of forces acting on critical sections and checks the strength and ductility. The final step requires inelastic capacity of structures. Each stephas own evaluation scheme with proper weighing factor dependent on the importance and consequence. This study applies the fuzzy theory to a scoring method that synthesizes the individual quantity to a representative value.

• 한국항해항만학회지
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• 제45권2호
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• pp.54-60
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• 2021

The aim of this study is to determine the critical factors and construction requirements for a new deep-water seaport system in the Lach Huyen area in northern Vietnam. In this study, the Analytic Hierarchical Process (AHP ) method was used to evaluate the importance of the criteria and subcriteria. The results were as follows: the principal criterion "geographical location (0.151)" ranked as the most important criterion for building a new deep-water port system, which is affected by the subcriteria "direct sea route with mega-vessel" and "good liner connectivity index". The principal criterion "port competency (0.145)" ranked second; thus, it can be concluded that good competitiveness of a port' will provide many benefits to the port and the region. Regarding the implication, the established evaluation framework can be used for port construction to make a more reasonable judgment. In a future study, the scope of evaluation factors should be widened, involving participation of broader stakeholders, such as shipping companies, forwarders, and logistics companies.

• Journal of Chest Surgery
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• 제19권3호
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• pp.506-514
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• 1986

Coarctation of aorta is rather common congenital cardiovascular defect in the western countries, but it is known to be rare in Korea. And no coarctation of Aorta has been reported and operated upon during early infancy in Korea. During 4 months period from May 1984 to September 1984, four small infants of coarctation of aorta were seen and treated surgically by subclavian flap aortoplasty in Guro Hospital, Korea University. All infants were male, ranging from 7 days to 54 days old [mean 29 days], weighing between 3.2 Kg and 5.0 Kg [mean 4.1 Kg], and all were in congestive heart failure. Examination of the femoral artery pulse gave in all cases clues to the diagnosis. By Two dimensional echocardiogram, detail anatomical features as well as the diagnosis were revealed and associated anomalies, for example, ventricular septal defect could be seen. Besides one case of isolated coarctation of aorta, other three infants had associated VSD. The 3 patients with VSD were treated by pulmonary artery banding in addition to aortoplasty. The postoperative course were smooth in all patients. In conclusion, coarctation of aorta may not be so rare in Korea as we thought previously. The importance of femoral pulse examination can not be overemphasized for the diagnosis. As we experienced, two-dimensional echocardiography in most cases can substitute those invasive examinations such as angiography and catheterization which carry difficulty and risk in infants.

• 통합자연과학논문집
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• 제16권4호
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• pp.133-138
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• 2023

After the SI system of units was adopted as an international system of units, Korea made a lot of efforts such as administrative and educational guidance on the traditional units that had been used so far. In addition, from July 1, 2007, the government has cracked down on the denotation of non-statutory units of measurement as standard units or auxiliary units in commercial transactions. However, non-statutory weighing units are still used in other forms. It is believed that this is because non-statutory units (= our traditional units) are permeated in our lives and are convenient to use. The general public still finds it difficult to use and mark the SI system of units correctly. This is not a problem unique to Korea. However, if you look at the books that are currently used as university physics textbooks, the SI system of units and the non-legal units of other countries are marked in such a way that they can be accurately converted. Only the traditional units of our country are disappearing under the pretext of unit unification. Accordingly, we propose that our units should not be neglected in university education, but should be labeled together. The purpose of this study is to raise the necessity of reorganizing the unit conversion between the SI unit system and the traditional life improvement unit, which continues to be the convenience of life, and applying it in university physics education to enable the conversion with our traditional unit, and to educate the importance of the meaning and function of our traditional unit.

• Clinical and Experimental Reproductive Medicine
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• 제8권1호
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• pp.23-34
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• 1981

In order to study twin pregnancies, a retrospective survey was carried out in Yonsei University, Severance Hospital. Twin deliveries during 1967-1976 numbered altogether 264, and their relative frequency was 1.30%. Clinical palpation in addition to auscultation and roentgenologic technique had been used in the twin diagnosis. The diagnosis was made prior to delivery in 93.18% of the cases. The deliveries took place in the 37.26th (S.D. 3.95) gestational weeks on an average. The mean weights of the infants were-A (first baby) 2416.03g. (S.D. 802.61), and B (second baby) 2299.81g. (S.D. 190.31). The most common manner of twin delivery was spontaneous vaginal delivery. Cesarean section was done in 14.39%, of which the most common indication was hypotonic uterine dysfunction (34.21 %). Low one minute Apgar scores occured more often in B twins than among A twins. Breech delivery gave low one minute Apgar scores more often than did spontaneous vertex delivery in both twins. Full term twins and infants weighing more than 2500g. had fewer low one minute Apgar scores than the preterm infants and those with low birth weight. Perinatal mortality (PNM) in the total series was 14.77% (A 12.50% and B17.05%). The most common cause of perinatal mortality was prematurity in 44.87%. The worst outcome was recorded for the age groups 15-19 and ${\geqq}$40, in which perinatal mortality were 50.00%, respectively. The perinatal mortality of both A and B infants was lowest in the group diagnosed early during antenatal care before delivery. On the basis of our findings, we wish to emphasize particularly the importance of the early diagnosis of twins.

• Archives of Plastic Surgery
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• 제48권4호
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• pp.373-377
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• 2021

Breast implant-associated anaplastic large cell lymphoma (BIA-ALCL) is a recently described form of T-cell non-Hodgkin lymphoma now formally recognized by the World Health Organization classification of lymphoid neoplasms. The aim of this paper is to report the first case of BIA-ALCL diagnosed in a pregnant patient. It is well known that BIA-ALCL appears as an indolent lymphoma with a good prognosis when diag-nosed at early stages and clinical guidelines for its management have been clearly published. Nevertheless, they lack a standardized approach for BIA-ALCL during pregnancy. With limited experience in our case, treatment has been safely postponed after term without affecting patient's overall prognosis and without fetal complication. The fact that the disease was diagnosed at an early stage (stage I) undoubtedly influenced the course of treatment. A multidisciplinary approach weighing the risks and benefits of treatment is of paramount importance in order to ensure the best possible outcome for both the mother and her child and clinical update guidelines should be issued.

• Safety and Health at Work
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• 제15권3호
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• pp.360-367
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• 2024

Background: In the food manufacturing industry, exposure to inhalable aerosols contributes to respiratory illnesses such as occupational asthma and rhinitis. However, there is a lack of comprehensive exposure assessment studies. This study evaluated occupational exposure to inhalable aerosols in an instant powdered food manufacturing plant during work operations involving dried food and powders. Methods: In total, 50 workers from an instant powdered food manufacturing plant were recruited. Personal inhalable aerosol exposure measurements were taken for both full-shift and task-based activities. The concentrations of inhalable aerosols were analyzed to identify any variation within and across departments, as well as between seasons, handedness, and sex. Results: In total, 134 personal air samples were collected, and the particulate mass was determined gravimetrically. The concentrations of inhalable aerosols ranged from 0.1 to 27 mg/m³ for full-shift exposure measurements and 3.1 to 73 mg/m³ for task-based measurements. Statistically significant differences in mean aerosol concentrations were found across departments (A:B p < 0.001, A:C p < 0.05, B:C p < 0.001) and between seasons (p < 0.001). Conclusion: This study revealed high exposure to inhalable aerosols among workers, particularly those involved in manual weighing, mixing, and adding powders. The significant differences between departments highlight the specific activities contributing to increased inhalable aerosol concentrations. Seasonal variations were also evident, with autumn showing higher concentrations of inhalable aerosols in all departments compared with summer. These findings emphasize the importance of understanding the distribution of aerosol concentrations across different work tasks and departments, particularly during different seasons.