• Nuclear Engineering and Technology
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• 제47권5호
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• pp.523-533
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• 2015

Three-dimensional flow phenomena in a wire-wrapped 37-pin fuel assembly mock-up of a Japanese loop-type sodium-cooled fast reactor, Monju, were investigated with a numerical analysis using a general-purpose commercial computational fluid dynamics code, CFX. Complicated and vortical flow phenomena in the wire-wrapped 37-pin fuel assembly were captured by a Reynolds-averaged Navier-Stokes flow simulation using a shear stress transport turbulence model. The main purpose of the current study is to understand the three-dimensional complex flow phenomena in a wire-wrapped fuel assembly to support the license issue for the core design. Computational fluid dynamics results show good agreement with friction factor correlation models. The secondary flow in the corner and edge subchannels is much stronger than that in an interior subchannel. The axial velocity averaged in the corner and edge subchannels is higher than that averaged in the interior subchannels. Three-dimensional multiscale vortex structures start to be formed by an interaction between secondary flows around each wire-wrapped pin. Behavior of the large-scale vortex structures in the corner and edge subchannels is closely related to the relative position between the hexagonal duct wall and the helically wrapped wire spacer. The small-scale vortex is axially developed in the interior subchannels. Furthermore, a driving force on each wire spacer surface is closely related to the relative position between the hexagonal duct wall and the wire spacer.

• Journal of Species Research
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• 제1권2호
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• pp.105-132
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• 2012

The saga of Megascolides orthostichon (Schmarda, 1861)-the first native worm described from Australasia-continues as its type-locality is unequivocally returned from Hobart, Tasmania to Mt Wellington, Auckland where a brief survey failed to unearth it. Since it has not been seen for 150 yrs, it may qualify under NZTCS or IUCN classification as 'Nationally Critical' if not 'Extinct'. New reports are for exotic Megascolecidae Anisochaeta kiwi sp. nov. and A. kiwi mihi sub-sp. nov. plus addition to the NZ faunal list of Australian Anisochaeta macleayi (Fletcher, 1889) that, due to its wide distribution in Australia and now New Zealand, may be a candidate model-species suitably resilient for eco-toxicological culture and monitoring. For holarctic Lumbricidae, new records are of Dendrobaena attemsi (Michaelsen, 1903) and the Murchieona muldali (Omodeo, 1956) morph or subspecies of M. minuscula (Rosa, 1906), neither lumbricid previously uncovered in Asia/Australasia. Also found for the first time outside its East Asian homeland is Eisenia japonica (Michaelsen, 1892) (which is compared to Japanese E. japonica hiramoto sub-sp. nov. and to E. anzac Blakemore, 2011). Records of these exotics plus recent new native species described by the author-including two, Rhododrilus mangamingi and Deinodrilus orcus spp. novae, herein-raise the numbers of megadriles known from New Zealand to 228 (sub-)species in five families. Preliminary mtDNA COI sequence barcodes are presented. Genus Tokea Benham, 1904 is revived on its lack of dorsal pores, losing or gaining some species with Megascolides M'Coy, 1878. An updated checklist of all 228 New Zealand taxa is appended.

• 무역상무연구
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• 제47권
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• pp.299-318
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• 2010

International trade environment is rapidly changing. Developing all economic activities included in the value chain of economy out of a particular country or region in the trends where globalization is spreading all over the world, 'a borderless world' has been created and become common throughout the world. Especially, in case of East Asian region, becoming the factory of the world, China has become a center of the world's economic activities in recent years; and the increase of regional investment among East Asian countries and trade expansion focused on China has been the factor of promoting the formulation of a regional trade network. SCM is an efficient way of adaptation to the complexity or uncertainty on the scene through the achievement of a sustainable competitive advantage by integrating the activities of improving the relationships in the supply chain. In this study, Sumitronics, a Japanese company, was studied as a case of the company who had implemented SCM effectively and efficiently utilizing the East Asian trade network. Not being engaged in the manufacturing processes in the headquarter, Sumitronics has implemented SCM which is capable of maximizing the responsiveness upon the requirements of customers by effective information sharing. In particular, the profits of the company have been maximized through SCM by its headquarter in Japan, which is capable of managing each base in East Asia as China and Southeast Asia, etc. Korean companies may also be able to create a new source of profit by dint of establishing SCM as such. The results of this case study has revealed that the implementation of an effective business model is the key of the successful implementation of SCM.

• 한국산림과학회지
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• 제88권3호
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• pp.320-326
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• 1999

연구에서는 잔존목의 본수에 대한 수식형태 및 고사율 추정 미분함수형태를 가정하여 인공림에 대한 잔존목을 추정하기 위한 15개의 함수들을 적분 및 지수함수형태로 유도하였다. 또한 이 모델들을 간벌이 되지 않은 스트로부스 잣나무 인공림의 반복측정 자료를 이용하여 모델의 적용성을 검토하였다. 그 결과 $t^{\beta}$와 같이 임령의 지수형태를 포함하는 3개의 함수들이 시간에 따른 자연 간벌효과를 설명하는데 상대적으로 유효한 것으로 나타났다. 한편 지위가 자연 간벌에 미치는 효과를 분석하기 위하여 낙엽송 임분의 잔존목 추정을 위한 함수를 유도하였다. 그 결과 $N_{min}$이 지위지수와 부의 상관관계를 가지는 것으로 나타났고, 초기 임분밀도를 같은 값으로 가정한 경우에도 잔존목 추정함수의 곡선이 지위지수별로 달라짐을 알 수 있었다.

• 한국환경과학회지
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• 제4권4호
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• pp.1-1
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• 1995

본연구는 일본 국립공원제도의 역사를 정책과 행정적측면을 중심으로 재평가 하였다. 일반적 인식과는 달리 일본의 국립공원제도는 보호와 개발을 적적히 조화시케는데 성공적이지 못하였고 이의 근본적 원인은 다음과 같이 요약된다. 일본의 국립공원제도는 크게 경제적 근거로 수립되어 전개되어 왔고 특히 경제캐발정책의 지배적 영향에 의해 좌우되어 왔으며 보호와 개발에 관한 정부 부터간의 정책적 및 행정적 조정이 수행되지 못하였다. 또한 국립공원 정책과 행정에 관한 의하결정의 폐쇠성은 주민참여와 환경단체의 영향력을 곡도로 제한하였고 국립공원의 대중적 인식도 유일한 국가유산보다는 오히려 유명관광지로 상징되어 엄격한 보호를 위한 대중적 지지력도 상당히 결여 되어왔다. 따라서, 관광개발 이득의 주된목적은 보호의 환경적 가치와 목적에 우선해 왔고 이는 오늘날까지 큰 변화없이 지속되고 있다. 이러한 일본의 실패경험과 교훈은 근본적인 평가없이 일본의 모델을 기본적으로 그대로 수용해 온 우리나라의 국립공원제도에 시사하는 바가 매우 크다. 우리의 영원한 국가적 환경유산을 구하기 위해서는 국립공원제도의 고감하고도 근본적인 개혁이 시급히 필요한 것으로 생각된다.

• 한국환경과학회지
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• 제4권4호
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• pp.303-315
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• 1995

본연구는 일본 국립공원제도의 역사를 정책과 행정적측면을 중심으로 재평가 하였다. 일반적 인식과는 달리 일본의 국립공원제도는 보호와 개발을 적적히 조화시케는데 성공적이지 못하였고 이의 근본적 원인은 다음과 같이 요약된다. 일본의 국립공원제도는 크게 경제적 근거로 수립되어 전개되어 왔고 특히 경제캐발정책의 지배적 영향에 의해 좌우되어 왔으며 보호와 개발에 관한 정부 부터간의 정책적 및 행정적 조정이 수행되지 못하였다. 또한 국립공원 정책과 행정에 관한 의하결정의 폐쇠성은 주민참여와 환경단체의 영향력을 곡도로 제한하였고 국립공원의 대중적 인식도 유일한 국가유산보다는 오히려 유명관광지로 상징되어 엄격한 보호를 위한 대중적 지지력도 상당히 결여 되어왔다. 따라서, 관광개발 이득의 주된목적은 보호의 환경적 가치와 목적에 우선해 왔고 이는 오늘날까지 큰 변화없이 지속되고 있다. 이러한 일본의 실패경험과 교훈은 근본적인 평가없이 일본의 모델을 기본적으로 그대로 수용해 온 우리나라의 국립공원제도에 시사하는 바가 매우 크다. 우리의 영원한 국가적 환경유산을 구하기 위해서는 국립공원제도의 고감하고도 근본적인 개혁이 시급히 필요한 것으로 생각된다.

• 한국조리학회지
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• 제7권2호
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• pp.157-179
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• 2001

Today the number or Chinese tourist visiting Korea is expected by 60% more than the number of them in the last year trunks to Chinese government's new policy on opening international trip. Overriding the striking perception of the new Chinese tourism market, the pre-research on this matter is not remarkable so far. It is expected that the theoretical base on the subject should be concrete. the purpose of the article is to provide the out-and-out information including the chinese market, the change of circumstance in China. Futhermore the study is proposed to offer valuable factor evaluating Chinese tourist to choose Korean restaurant and the relational consideration of the menu between estimation and satisfaction at the restaurant during their stay in Korea. In order to achieve the purpose of this paper, it is gore ahead of the literature review including the previous research on the menu of Hotel & Restaurant The major field research is to build a frame of the paper and present the model to release my humble theory. The 1imitation of the study was to make much of the literature basis due to insufficient previous research on the issue, The study would be framed into 6parts 1ike introduction, literature review, analysis of present coalition in China, major study including exploitative research, suggestion and dissuasions & conclusion. After the exploitative research, the study was approached to make findings through the questionnaires designed to find the relationship factor between chinese tourist's evaluation and satisfaction in the Hotel and Restaurant. According to the finding, chinese tourist tend to prefer the group ranging resonable-price and Japanese dishes to other group. They also interested the certain recipe including fish and vegetable. The evaluation menu is directly related to the satisfaction of Chinese tourist and we need a substantial managerial insight on it when the menu is already designed.

• Safety and Health at Work
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• 제8권1호
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• pp.94-98
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• 2017

Background: Physical activity (PA) is ranked as a leading health indicator and the workplace is a key setting to promote PA. The purpose of this study was to examine how goal-setting and exercise self-efficacy (SE) during a health promotion program influenced PA level among Japanese workers. Methods: Using a cross-sectional study design, we surveyed 281 employees. The short version of the International Physical Activity Questionnaire was used to assess PA level. Exercise SE was assessed using a partially modified version of Oka's exercise SE scale. Personal goals were assessed as the total numbers of "yes" responses to five items regarding "details of personal goals to perform PA". A mediational model was used to examine whether exercise SE mediates between the number of personal goals and PA level. Results: The mean age of the participants was 46.3 years, 76.2% were men, and the most common occupational category was software engineer (30.6%). The average PA level per week exceeded the recommended level in 127 participants (45.2%). One hundred and eighty-four participants (65.5%) set some form of concrete personal goal to perform PA. The relationship between the number of personal goals and PA level was mediated by exercise SE. Conclusion: Our study showed that exercise SE mediates goal-setting and increases PA. The results suggest that the components of PA promotion programs should be tailored to enhance participants' confidence in performing PA.

• 대한조선학회논문집
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• 제47권6호
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• pp.757-762
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• 2010

Korean fishing boats have had appropriate hull forms for the safety, stability and convenience of fishing ability. However, Korean fishermen are recently concerned about the resistance performance and speed of Korean fishing boats, because the prices of fuel oil are gradually risen, also the exhausting of fish resources and the demand of high speed fishing boats are increased. Therefore, the necessity of the study on the improvement of resistance performance for Korean small coastal fishing boats is gradually increased. This study compares the hull form characteristics of Korean fishing boats with those of Japanese fishing boats, and the hull form of a representative Korean fishing boat is modified. From the modification of the hull form parameters for the Korean fishing boat, the improvement of resistance performances is evaluated. Moreover, the increase of resistance performances is also achieved from the modification of local characteristics for the hull form of the Korean fishing boat. A computational method and ship model tests in towing tank are used for the conformations of the improvement of resistance performance.

• 한국수학교육학회지시리즈C:초등수학교육
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• 제21권2호
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• pp.237-260
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• 2018

본 연구는 4개국의 초등학교 수학 교과서 비와 비율 단원에서 어떠한 모델을 사용하고 있는지 알아보고, 비례에 대한 곱셈적 사고와 비례 상황의 구조에 따라 이러한 모델이 교과서에 어떻게 반영되어 있는지 살펴보았다. 이를 위해 한국, 일본, 싱가포르, 미국의 초등학교 5, 6학년 수학 교과서를 비교 분석하였다. 그 결과 그림 모델과 비표, 이중수직선, 테이프 다이어그램에서 비례에 대한 곱셈적 사고와 비례 상황의 구조에 따른 차이를 확인할 수 있었다. 또한 다중묶음관점에서 변동부분관점으로 이어지는 일본교과서의 전개나 두 가지 이상의 모델이 함께 쓰인 각 나라 교과서의 사례에서 곱셈적 사고의 연결 및 통합 가능성을 찾을 수 있었다. 따라서 학생들의 곱셈적 사고를 신장시키고 측정 공간 내 또는 측정 공간 사이의 비례추론을 지도하기 위해 차기 교과서에서 어떤 종류의 모델을 어떻게 제시하는 것이 효과적일지 좀 더 신중한 검증과 논의가 필요하다.