• Journal of the Korean Society for Railway
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• v.12 no.4
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• pp.548-556
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• 2009

In order to evaluate applicability of rock cut-slope investigation system, typical clinometer and photogrammetry investigation system were used for rock slopes; first for 7 discontinuities, and secondly, 10 discontinuities, and the results were compared. The first verification was performed depending on discontinuity joint shapes and slope angles, and the second verification was performed depending on shot time and shot locations. The results showed that differences of dip direction $1^{\circ}{\sim}4^{\circ}$, dip $0^{\circ}{\sim}4^{\circ}$. In the second verification test, the differences of dip direction was $0^{\circ}{\sim}6^{\circ}$, and dip $0^{\circ}{\sim}6^{\circ}$. The photogrammetry method for rock slope survey system is quite reliable when clinometer generally shows ${\pm}10^{\circ}$ errors due to surface roughness and investigator.

• Journal of Korea Technology Innovation Society
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• v.14 no.1
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• pp.22-39
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• 2011

This study examines the wage level from a viewpoint of major-job match as part of an analysis on the skill mismatch problem in 4-year college graduates. The empirical analysis explicitly incorporate the sample selection bias as an econometric problem not only suggested but merely introduced in the earlier studies. This study also set up a major-job match variable, which was usually handled as a binary variable for analytical convenience, as a polychotomous choice variable in selection equation as provided by the survey. In particular, it considered multi-cohort survey on graduates of the years 1982, 1992, and 2002 for the empirical analysis. As a result of empirical analysis, the wage premium of a major-job match was identified. This result was consistent after the consideration of a sample selection bias and also after modeling the major-job match variable as polychotomously selective. Through an analysis classified by the major, this study identified a relatively high wage premium among Social Science, Engineering, and Science majors. However, there was a difference in the effect of selection among these majors. Also, by assessing cohort effects this study found that the skill mismatch had rapidly progressed in 1992, while difference between 1992 and 2002 cohorts are insignificant. The analysis suggests that wage level is better understood within the context of both sample selection and major-job match, and regardless of model specification the major-job match affects wage strongly.

• Korean Journal of Food Science and Technology
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• v.51 no.5
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• pp.425-431
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• 2019

Selected leafy vegetables, widely used for Korean Namul dishes, were heat-treated in different ways and their folate retention was investigated. The Lactobacillus casei method was applied for folate estimation and validated to ensure reliability of analytical data. The folate content in Namul highly varied, from 29.7 to $293.4{\mu}g/100g$, depending on the heating methods and the types of vegetables. Most of the Namul variants showed increased folate content on heat treatment. Frying yielded higher folate retention than the other cooking methods (blanching, steaming, baking, and panfrying), and pig weed showed the highest folate retention (3.3 times, $293.4{\mu}g/100g$). L. casei assay for folate estimation showed 95.7% recovery and relative standard deviations less than 2% for both reproducibility and repeatability, indicating good accuracy and precision. Quality of the folate assay was assured by monitoring a quality control chart and a proficiency test (z-score= -0.1) during the entire of study.

• The Journal of Korean Association of Computer Education
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• v.12 no.4
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• pp.57-64
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• 2009

Protein structure comparison is a task that requires a lot of computing resources because many atoms in proteins need to be processed. To address the issue, Grid computing environment has been employed for processing time-consuming jobs in a distributed manner. However, controling the Grid computing environment may not be easy for non-experts. In this paper, we present a JXTA-based system for protein structure comparison that can be easily controled by non-experts. To search proteins similar to a query protein, the geometric hashing algorithm that consists of preprocessing and recognition was employed. Experimental results indicate that the system can find the correct protein structure for a given query protein structure and the proposed system can be easily extended to solve the protein docking problem. It is expected that the proposed system can be useful for non-experts, especially users who do not have sophisticated knowledge of distributed systems in general such as college students who major in biology or chemistry.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.11
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• pp.4151-4160
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• 2010

Recently the arts and cultural sector is drawing attention as a new growth engine of the Korean economy. The paper is empirically analyzed on the gender wage differentials in the arts and cultural sector and specially focused on decomposing the wage differentials between the manufacturing sector and the arts and cultural sector. Our results may be partly useful for explaining the existing phenomenon of the arts and cultural sector in Korean labor markets, for example, young, highly educated, part-time contracts, less gender discrimination, etc. The results might provide somehow the policy directions of reducing the gender wage differentials.

• Information Systems Review
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• v.11 no.2
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• pp.113-129
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• 2009

With increasing interest in information security, many studies have been conducted on cultivation and management of information security manpower. The widespread application of information security made the activity of information security professionals more diverse. Therefore, it is essential to analyze the knowledge and skills that are necessary for information security professionals to carry out their job and we also need to take these into considerations for the development and operation of education programs. In this study, for analyzing the perception gaps of information security knowledge and skills level between academia and industry, we have derived 58 knowledge and skills by conducting the literature review and Delphi method and we also conducted a survey of information security knowledge and skills requirements for information security professionals who are now working in industries and educational organizations. As a result, we analyze the perception gaps between two groups of information security professionals and suggest some guidelines for establishing the demand-based curriculum for training information security professionals.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.26 no.3
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• pp.201-219
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• 2021

Recently, in order to understand the role of the ocean in global problems such as climate change, various researchers have made efforts to integrate and systematically manage the data collected from the world's oceans over the past half century. In Korea, public institutions, research institutes, and universities are carrying out efforts to continuously monitor changes in the marine environment in the waters surrounding Korea. The various types of marine chemical data produced in this way have been independently managed according to the purpose of each institution. Recently, efforts are being made to integrate various data led by the state. In this study, the data quality management method used to systematically manage the data of various types produced by various institutions abroad was explained. In this study, by applying this method, the format of data produced by various domestic institutions is unified, primary quality control of data according to oceanographic characteristics, secondary quality control using reliable data and comparison or standard materials, etc. It aims to provide basic information for carrying out these processes, and ultimately contribute to integrating data collected for various purposes in Korea into a data set that can be compared with each other regardless of the proficiency of producers.

• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2005.11a
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• pp.369-372
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• 2005

산업체에서 사용되는 BLDC 모터 제어보드의 경우에는 대량 생산을 통하여 제작하며, 제작과정에서 발생한 불량 제어보드는 모터의 초기 기동실패와 고속회전시의 소음 및 화재 발생 등의 원인일뿐만이 아니라 이를 사용하여 응용제품을 생산하는 업체의 품질관리면에서 제어보드의 이상유무 확인이 반드시 필요하다. 일반적인 모터 제어보드의 이상 유무는 육안 및 소음에 의한 방법으로 모토의 기동실패나 고속 회전을 통한 소음등으로부터 경험에 의해 판단한다. 그러나 고속 회전시 발생되는 소음으로 모터 제어보드의 이상유무를 판단하게 되면 이상유무 판단에 필요한 시간이 길어져 대규모 생산과정에 적합하지 않을 뿐만아니라 작업자의 경험에 의존하게 됨으로써 생산성에 지장을 주게된다. 또한 검사시간을 줄이기 위하여, 저속 회전만으로 이상유무를 판단하고자 할 경우 소음정도가 약해 이상유무를 판단하기가 매우 어렵고 더욱더 숙련된 검사자를 필요로 하게 되므로 생산공정에 자동검사기의 도입이 필요하디. 본 논문은 BLDC 모터 제어기의 이상이 발생할 수 있는 경우를 고찰하고, 이러한 BLDC 모터 제어보드의 이상상태가 납땜불량 및 소자 파괴 의하여 입${\cdot}$출력이 비정상적으로 이루어 질 경우의 전류신호와 정상일 때의 전류신호를 비교분석한 후 이를 검출할 수 있는 아날로그 회로를 구현하고 실험을 통하여 검증을 하였다. 또한 이러한 BLDC모터 제어기의 검사기를 아날로그 회로로 구현할 경우의 주의점을 고찰한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.11 no.2
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• pp.135-143
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• 2011

Currently network management systems(NMS) just give useful information about the criticality of the alarms and the process of the fault analysis is mainly dependent on the experts who have many years experiences in the field. Due to these reasons it takes very much time and manpower cost to localize the real root of the fault from the alarm information. Therefore, to solve these problems in this research we analyze the probability of the fault for each alarm and provide how to give the problem solving procedure with confidence level and give idea to build a system to realize the problem solving procedure. In addition, we give a case study to show how to use the proposed ideas.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2010.04a
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• pp.59-60
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• 2010

Unlike cases of fire on land where experienced fireman and various fire fighting equipment are present, onboard fires need to be independently extinguished, making it a complex process. The primal objective of getting quick control of a fire is to prevent casualties which generally occur from inhalation of toxic fumes rather than the fire itself. However, if for some inevitable reason the fire cannot be contained, everyone in that particular area must evacuate to avoid any possible casualties. In this research, through a simulation of the CFD, we will observe the soot density concentration which affects evacuation within an onboard fire in relation to the possible evacuation time to conclude a time zone for a safe exit.