• Transactions of the Korean Society of Mechanical Engineers A
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• v.37 no.7
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• pp.875-881
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• 2013

The failure of a bolted joint owing to stress corrosion cracking (SCC) has been considered one of the most important structural integrity issues in a nuclear power plant. In this study, the failure possibility of bolting, which is used to support the steam generator of a pressurized water reactor, owing to SCC and brittle fracture was evaluated in accordance with guidelines proposed by the Electric Power Research Institute, which are called the Reference Flaw Factor method. For this evaluation, first, detailed finite element stress analyses were conducted to obtain the actual nominal stresses of bolting in which either service loads or bolt preloads were considered. Based on these nominal stresses, the structural integrity of bolting was addressed from the viewpoints of SCC and toughness. In addition, the accuracy of the EPRI Reference Flaw Factor for assessing bolting failure was investigated using finite element fracture mechanics analyses.

• Journal of the Korean Society for Library and Information Science
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• v.45 no.2
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• pp.75-96
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• 2011

This research investigated the facts about the place and date of praying for the engraving of the first edition of Tripitaka Koreana. Major findings are as follows: 1) The very first idea of engraving the first edition of Tripitaka Koreana was evidenced in the record of 'The beginning of Tripitaka Koreana' from 'Daejanggakpan Gunsin Gigomun' written by YiGyuBo. 2) After comparing the contents of 'Daejanggakpan Gunsin Gigomun' with the record of the third volume of 'Goryeosa Jeolyo' dated February 13, 1011, this researcher confirmed that 'Daejanggakpan Gunsin Gigomun' also recorded this historical fact. 3) In the third volume of 'Goryeosa Jeolyo' dated February 13th, 1011, it is documented that a ritual was held to pray to the gods of heaven and earth for expelling the Kitan from the country. Further, the document states that this particular ritual consisted of a ceremony of lanterns held at the temporary palace in Cheongju on February 15th, to report to the gods on 'the engraving of the first edition of Tripitaka Koreana' 4) Therefore, it is verified that the date of praying for the engraving of the first edition of Tripitaka Koreana was February 15th of the lunar calendar, 1011(the second year of King Hyunjong's reign), and the place was the temporary palace in Cheongju.

• Restorative Dentistry and Endodontics
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• v.25 no.3
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• pp.407-420
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• 2000

삼차신경절의 뉴런이 구강악안면영역에서의 촉각, 입각, 온도각 및 통각 등 다양한 감각을 중추신경계로 전달하는 역할을 하는 것은 주지의 사실이다. 이러한 신경전달에 있어서 이온통로는 감각정보를 전달하는데 핵심적인 역할을 수행하며 특히 소디움 통로는 활동전위의 발생에 중요하다. 소디움 통로는 tetrodotoxin-sensitive(TTX-s) 및 tetrodotoxin-resistant(TTX-r) 통로로 나누어지는 데 이 중 TTX-r 통로에 발생되는 tetrodotoxin-resistant sodium current(TTX-r $I_{Na}$)는 capsaicin에 민감한 일차구심신경세포에서 유해자극에 의해 통각신호를 발생시키고 전달하는데 중요하다. 또한 칼슘 통로는 시냅스 전도에 있어서 필수적인 역할을 수행하고 있다 한편 치과영역에서 치수의 진정 목적으로 eugenol이 흔히 사용되고 있다. 그러나 eugenol의 그 작용 기전에 대해서 현재까지 이온 통로에 대한 상세한 결과가 없는 실정이며 최근의 보고에 의하면 eugenol이 capsaicin 수용기를 통하여 감각신경에 대한 억제작용을 나타낸다고 한다. 따라서 본 실험은 eugenol과 capsaicin이 흰쥐의 삼차신경절의 TTX-r $I_{Na}$와 칼슘통로에 어떠한 영향을 미치는지를 알아보고 eugenol이 capsaicin 수용기를 통하여 작용하는지를 검증하고자 시행되었다. 삼차신경절 뉴런은 100~150g의 흰쥐의 삼차신경절로부터 외과적으로 절제하여 통법의 화학적 및 기계적 처리를 통해 단일세포로 분리하였고 이를 whole-cell patch clamp 방법을 이용하여 시행한 바 다음과 같은 결론을 얻었다. 1. 1mM의 dugenol은 흰쥐 삼차신경절 뉴런의 TTX-r $I_{Na}$와 HVA $I_{Ca}$를 억제하였다. 2. $1{\mu}m$의 capsaicin은 흰쥐 삼차신경절 뉴런의 TTX-r $I_{Na}$와 HVA $I_{Ca}$를 억제하였다. 3. Capsazepine은 capsaicin의 HVA $I_{Ca}$에 대한 억제작용을 차단하였다. 4. Capsazepine은 capsaicin의 HVA $I_{Ca}$에 대한 억제작용을 차단하지 못하였다. 결론적으로 eugenol과 capsaicin은 tetrodotoxin-resistant sodium current(TTX-r $I_{Na}$)와 high voltage-activated calcium current(HVA $I_{Ca}$)를 모두 억제하는 것으로 나타났으며, 이러한 작용이 통각의 발생과 시냅스 전달과정을 차단하여 치수 진정 목적으로 많이 사용하는 eugenol의 작용기전으로 판단된다. 한편 capsaicin의 길항제인 capsazepine을 전처치하였을 때에도 eugenol의 HVA $I_{Ca}$에 대한 억제효과는 변화가 없었다. 이와같은 결과로 보아 HVA $I_{Ca}$에 관한 한 eugenol은 capsaicin 수용기를 통하여 나타나지 않는 것으로 사료된다.

• Journal of Korean Philosophical Society
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• v.116
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• pp.313-350
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• 2010

This article studies criticism leveled at Yulgok scholarship by the Toegye School in the northern Gyungbuk region. The Toegye School (Yulgok School) was formed both by theoretical contention and constructive criticism with its counterparts. Accordingly, the main intellectual traits of the Toegye School may not be fully appreciated by inquiring into its theoretical structure and context only; rather, this study proposes that a sound understanding of the Toegye School must be accompanied simultaneously with an analysis on aspects of the altercation with the Yulgok School of the time. In this regard, this article primarily aims to shed light on the Toegye School's theoretical context through surveying the criticism leveled by the Toegye School in the northern Gyungbuk region, which hold steadfast adherents to the discipline among other regions, against the Yulgok scholarship. Embracing the Confucian ethic, the philosophical principles of the Toegye School based on autonomy of 'Li'(理), i.e. ethical objectivism, basically aimed at reaching the state of self-manifestation. Namely, the main objective of the Toegye School was to anchor the way how the school understood existential form and cause of the universe to an ethical foundation in a crystal clear way and, accordingly, this belief in which the Toegye School gave a priority to 'Li' rather than 'Gi'(氣) must have given an advantageous position in terms of theoretical clarity over its counterparts. Furthermore, the crux of the Confucian ethical world view in the Toegye School's modes of inquiry could berevealed by the Toegye's 'Libal(理發)-theory'. From this point of view, the fundamental criticism that could be waged by the Toegye School was against Yulgok scholarship's gross misconception of perceiving 'Gi' as 'Li.' Scholars and commentators in the Toegye School severely disapproved of the possibility of ethical objectivism of Yulgok scholarship.

• Information Systems Review
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• v.10 no.3
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• pp.185-205
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• 2008

As time to market and rapid reaction to changes in demand is much required, agile software development methodologies whose characteristics are great adaptability and short iteration developments are getting more popular. Though there have been a number of literature suggesting the great potential of agile software development, some recent studies have also mentioned its limitations. We believe there remains much confusion as to whether agile approaches are good to introduce or not. In an effort to provide 'real' characteristics of agile development, this paper evaluates Scrum, one of the most used agile approaches, using a software measurement framework. It also presents a Scrum measurement case study of a web portal company. We believe this study will provide some concrete guidelines as to whether Scrum is worth, what are weak points, and how to control the agile process in order to get over the weakness.

• Journal of Korean Port Research
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• v.13 no.1
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• pp.65-78
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• 1999

운송에 필요한 각종 서류와 정보의 효율적 교환은 국제물류시스템의 중요한 일부분이 되었다. 또한 EDI(전자문서교환)는 수출입에 필요한 각종 상거래 서식을 컴퓨터가 읽을 수 있는 표준화된 전자문서의 형태로 바꾸어 교환함으로써 무역절차의 간소화와 운송서류의 신속한 교환을 가능하게 하여 물류 효율성을 증대시키는 것으로 알려져있다. 이러한 맥락에서 세계각국의 항만당국은 자국의 물류혁신을 도모하기 위하여 경쟁력으로 EDI의 도입을 추진해왔다. 그러나 90년대에 들어 EDI의 발전은 처음의 기대와는 달리 저조한 것으로 나타났다. 이는 크게 두가지로 설명된다. 첫째는 EDI 문서의 국제표준을 제정하는 UN/ECE 산하 WP4의 표준제정 미 공표의 비효율성으로 인해 실제 상거래에서 필요한 문서들의 EDI 표준화가 제때에 이루어지지 않았다는 점이다. 두 번째 이유는 대부분의 EDI 사용자가 전자문서의 교환통로로 이용해 왔던 부가가치통신망(VAN)서비스의 고비용적인 구조로 인하여 비용에 민감한 중소규모 화주들의 폭넓은 이용을 저해왔다는 점이다. 따라서 본고에서는 EDI의 확산을 저해했던 두가지 문제점에 입각하여 먼저 효율적 EDI 표준 제공을 위한 국제적 노력의 산물인 CEFACT(Center for Facilitation of Procedures and practices for Administration Commerce and Transport))와 보다 안전하고 신뢰성 있는 전자상거래 솔류션의 마련을 위해 이루어진 각종 국제기구들의 활동 및 결과물들을 소개하고 다음으로 인터넷의 급속한 확산으로 새롭게 개발되고 있는 Web-based EDI, XML/EDI, Simpl-EDI, Form-based EDI 그리고 Lite-EDI의 저비용적 구조 측면을 분석하여 중소규모화주들의 EDI에 대한 인식을 제고시킴으로써 EDI의 전반적인 확산을 도모하고 있다.

• Korean Journal of Childcare and Education
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• v.8 no.6
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• pp.169-192
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• 2012

This study reviewed the current status of in-service education programs for infant care teachers in early childhood education and care settings. In addition, the training program(titled "infant specialist program") which had been developed in one district of Seoul in order to assist the job performance and speciality for infant care teachers was discussed. The focus in the development of the training program, its teaching content and method were addressed in detail. The results related to evaluation of the training program of interest were reported. The infant care teachers who had participated in the training program reported that the levels of their teaching efficacy and those of knowledge of infant development from post-tests were significantly increased over time. In line with the main results of this study, implications for practice and policy were discussed.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.6 no.2
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• pp.23-30
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• 2012

In this study, we developed a wireless rehabilitation auditory feedback gait training system for symmetrical weight-bearing in patient with CVA. The device consists of an instantaneous shoe equipped with two load-cell sensors. Auditory feedback can be applied according to the weight-bearing. For gait patterns analysis, cadence, walking velocity, stance/swing phase ratio and gait cycle were examined. The clinical test with six healthy volunteers and two hemiplegic patients was performed applying the auditory feedback system. Both normal subjects and hemiplegic patients were increased strength on weight-bearing in affected limb, walking velocity, and cadence after biofeedback device. Also, the stance time with weight-bearing was increased while the swing time was decreased in gait phase. It can be expected that by using the feedback system, the patient with lower limb disorder will be able to reach a better quality of weight-bearing during gait.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.36 no.5
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• pp.507-513
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• 2008

In this paper, we present a development of an Avionics Hot Bench(AHB) used for the verification of operational flight programs and fault analysis using various simulation and stimulation software. We propose an application of the open system architecture to develop the AHB which can be used for the development of a real aircraft avionics system. In the design of the AHB, to reduce the development period and cost we use as many as commercial off-the-shelf hardware and software items. The developed AHB is compared with the existing proven AHB which was used for T-50 avionics system development. Thorough comparison between the test results using the developed AHB and those using the existing AHB is performed and the overall comparison results are very satisfactory.

• Informatization Policy
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• v.18 no.2
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• pp.72-84
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• 2011

Along with the fast development of "smart"information technology including smart phones, a concern for increased productivity and better work-life balance is growing faster than ever. In many cases, the expectations for "smart work"remain only superficial at most, and the theoretical foundation for smart work research, much less with clear definitions, is not based on sound research. This article primarily aims to clarify the differences between the concept of telework and that of smart work. Particularly, a research framework for smart work, reflecting the points of differentiation for smart work on the basis of previous telework research framework is suggested. Then, we go further to discuss the limitations of existing telework research to suggest new research agenda for smart work research, and review current smart work policy being executed by the Korean government to suggest directions for the future. We expect to make academic contributions to the advancement of smart work research in the IS research field as well as provide practical insights for local policy planners.