• 한국실내디자인학회:학술대회논문집
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• 한국실내디자인학회 2007년도 추계학술발표대회 논문집
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• pp.103-106
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• 2007

The idea of shopping is changed from a purchase of merchandise to an experience of pleasure. This study is a space composition analysis for the introduction of theme in multi-plex shopping center design to reflect variable consumer trend and company marketing strategy. The study progressed through theoretical consideration and substance analysis about the shopping centers which had been designed by Jerd Partnership from 2000 in Japan. The following is result. The path is a sole main street that is made of curve form, parallel and vertical circulating rout and movement of human being. It leads continuity. The node and landmarks have a circular court with typifier as powerful center, character of transition space and event for experience. It makes locational quality. The districts are composed of retail shops, restaurants and culture facilities and the edge is represented by closed vertical wall and parapet. It induces a domain. The characteristic of Jerde shopping center is an experience of theme environment through the path as betweenness space with a story based on a main theme.

• 환경영향평가
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• 제14권6호
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• pp.387-402
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• 2005

In this study, we tried to predict the change of future land-cover and relationships between land-cover change and geo-spatial information in the Gongju area by using fuzzy logic operation. Quantitative evaluation of prediction models was carried out using a prediction rate curve using. Based on the analysis of correlations between the geo-spatial information and land-cover change, the class with the highest correlation was extracted. Fuzzy operations were used to predict land-cover change and determine the land-cover prediction maps that were the most suitable. It was predicted that in urban areas, the urban expansion of old and new towns would occur centering on the Gem-river, and that urbanization of areas along the interchange and national roads would also expand. Among agricultural areas, areas adjacent to national roads connected to small tributaries of the Gem-river and neighboring areas would likely experience changes. Most of the forest areas are located in southeast and from this result we can guess why the wide chestnut-tree cultivation complex is located in these areas and the possibility of forest damage is very high. As a result of validation using the prediction rate curve, it was indicated that among fuzzy operators, the maximum fuzzy operator was the most suitable for analyzing land-cover change in urban and agricultural areas. Other fuzzy operators resulted in the similar prediction capabilities. However, in the prediction rate curve of integrated models for land-cover prediction in the forest areas, most fuzzy operators resulted in poorer prediction capabilities. Thus, it is necessary to apply new thematic maps or prediction models in connection with the effective prediction of changes in the forest areas.

• Journal of Korean Neurosurgical Society
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• 제40권1호
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• pp.16-21
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• 2006

Objective : Young neurosurgeons need to focus on the mortality and morbidity of aneurysmal neck clipping to develop a personal experience with an initial series. Methods : Total 88 aneurysms from 75 patients who underwent neck clipping by the same operator from 2001 to 2004 were reviewed. Patients were divided into three groups : first year [Group I], second year [Group II], and third year [Group III] in each group. Location of aneurysm, age, Fisher grade, Hunter-Hess grade [H-H grade], postoperative Glasgow outcome scale [GOS], and complications related to surgical procedures were evaluated with Chi-square and logistic regression analyses. Results : Fourteen patients had complications related to surgery [18.7%]. The major causes of mortality and morbidity related to surgery were cerebral infarction, hemorrhage and brain swelling due to intraoperative rupture, brain retraction and vasospasm. Among the 4 cases of mortality were 2 patients in Group I, 1 patient in Group II and 1 patient in Group III, and location of aneurysms were 2 internal carotid artery[ICA] and 2 posterior communicating artery[PCoA] aneurysms. There were 4 morbidity and new neurological deficits in Group I, 4 in Group II and 2 in Group III. Although mortality and morbidity during the learning curve had a statistical significance in H-H grade, age [>60 years old], and aneurysm location [especially ICA aneurysm] as variables, mortality mainly occurred in ICA and PCoA aneurysms. Conclusion : Experienced supervision or endovascular approach should be considered for the treatment of ICA and PCoA aneurysms during the learning curve.

• Corrosion Science and Technology
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• 제5권5호
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• pp.168-172
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• 2006

Alloy 600 having a superior resistance to a corrosion is used as a steam generator tubing in nuclear power plants. In spite of its high corrosion resistance, there are many tubings which experience corrosion problems such as a SCC under the high temperature and high pressure environments of nuclear power plants. The Alloy 600 tubing can be repaired by using a Ni electroplating having an excellent SCC resistance. In order to carry out a successful Ni electrodeposition inside a steam generator tubing, the effects of various parameters on the material properties of the electrodeposit should be elucidated. Hence this work deals with the effects of an applied current density, duty cycle($T_{on}/(T_{on}+T_{off})$) of a pulse current, bath temperature and solution pH on the material properties of Ni electrodeposit obtained from a Ni sulphamate bath by analyzing the current efficiency, potentiodynamic curve, hardness and stress-strain curve. Hardness, YS(yield strength) and TS(tensile strength) decreased whereas the elongation increased as the applied current density increased. This was thought to be by a concentration depletion at the interface of the electrodeposit/solution, and a fractional decrease of the hydrogen reduction reaction. As the duty cycle increased, the hardness, YS and TS decreased while the elongation increased. During an off time at a high duty cycle, the concentration depletion could not be recovered sufficiently enough to induce a coarse grain sized electrodeposit. With an increase of the solution temperature and pH, the YS and TS increased while the elongation decreased. The experimental results of the hardness and the stress-strain curves can be supplemented by the results of the potentiodynamic curve.

• 서비스연구
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• 제14권1호
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• pp.44-62
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• 2024

코로나19로 인한 온택트 서비스의 발달과 친환경 장례 문화의 사회적 이슈는 온라인 장례라는 새로운 문화의 필요성을 인식하게 하였다. 국내 기관 및 기업에서 온라인 장례 서비스 활성화를 위한 시도가 여러 차례 있었으나, 효과는 미약한 실정이다. 본 연구의 목적은 온라인 장례 플랫폼의 초기 사용자 경험 분석을 통해 사용성의 문제를 파악하고, 온라인 장례 플랫폼의 접근성 및 사용성을 향상할 수 있는 서비스 개발을 제안함에 있다. 이에 본 연구에서는 사용자 경험(UX), OOBE, FTUE 이론의 문헌 고찰을 통해 온라인 장례 플랫폼의 접근성과 사용성 향상에 영향을 주는 요인을 파악하고, 대표적 온라인 장례 앱 '메모리얼'을 연구 대상으로 선정하여 실험을 진행하였다. 초기 사용자 경험을 분석하기 전, 연구 대상인 앱 '메모리얼'의 UX 서비스 특성을 이해하고자 유사 타 서비스와의 IA를 비교 분석하였다. 또한 온라인 장례 플랫폼 사용 경험이 없는 피실험자 10명을 대상으로 Unpack-Setup/Configure-First Use 단계에 해당하는 태스크를 수행하고, 실험 과정을 UX Curve로 표현하여 부정적인 경험이 발생한 지점과 요인을 파악하였다. 그 결과, 주요 문제 요인으로 불필요한 UI 요소, 회원가입 단계에서의 민감한 개인정보 요구, 서비스의 몰입감 부족 등이 있었고, 개선 사항으로는 사용자 간의 감정 공유 및 원활한 소통 촉진을 위한 커뮤니티 기능 강화 등이 있었다. 이러한 인사이트를 반영하여 기존 앱 서비스의 문제점을 해결할 수 있는 서비스 개발을 제안하였다. 개발한 프로토타입의 타당성을 검증하고자 서비스 디자인 전문가 3인의 인터뷰를 진행하였다. 본 연구는 최근 부상하고 있는 온라인 장례 서비스의 질적 향상과 활성화에 기여하기 위해 진행되었으며, 온라인 장례 서비스의 현황을 이해하고, 서비스 접근성과 사용성 강화를 위해 필요한 요인을 규명하였다는 점에서 연구의 의의가 있다.

• 대한소아치과학회지
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• 제42권1호
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• pp.30-37
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• 2015

새로운 우식 활성 비색 검사인 $Cariview^{(R)}$는 새로운 pH 지시약을 사용해서 치태 세균의 산 생산 능력을 더 잘 반영할 수 있다. 본 연구는 소아에서 $Cariview^{(R)}$와 치아 우식 경험(dmft index)과의 상관성을 평가하고, $Cariview^{(R)}$를 Dentocult $SM^{(R)}$과 비교할 목적으로 수행되었다. 만5세 이하 135명의 소아를 대상으로 dmft를 기록했으며, $Cariview^{(R)}$와 Dentocult $SM^{(R)}$ 두 가지 우식 활성 검사를 제조사 지시에 따라 시행하였다. 그 결과, $Cariview^{(R)}$는 소아의 치아 우식 경험과 중등도의 상관관계를 보였다(r = 0.43, p < 0.01). 치아 우식증 예측에 있어 $Cariview^{(R)}$는 민감도 68.8%, 특이도 69.2%, ROC 곡선 분석의 곡선하면적(AUC) 0.686으로 Dentocult $SM^{(R)}$에 비해 양호한 수치를 보였다. $Cariview^{(R)}$는 비협조적인 어린이에게도 시행이 쉽고 편리하며 시각적인 색상으로 나타나 구강위생교육 도구로서 가치가 있다.

• Journal of Korean Neurosurgical Society
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• 제67권1호
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• pp.60-72
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• 2024

Objective : Recently, robotic-assisted spine surgery (RASS) has been considered a minimally invasive and relatively accurate method. In total, 495 robotic-assisted pedicle screw fixation (RAPSF) procedures were attempted on 100 patients during a 14-month period. The current study aimed to analyze the accuracy, potential risk factors, and learning curve of RAPSF. Methods : This retrospective study evaluated the position of RAPSF using the Gertzbein and Robbins scale (GRS). The accuracy was analyzed using the ratio of the clinically acceptable group (GRS grades A and B), the dissatisfying group (GRS grades C, D, and E), and the Surgical Evaluation Assistant program. The RAPSF was divided into the no-breached group (GRS grade A) and breached group (GRS grades B, C, D, and E), and the potential risk factors of RAPSF were evaluated. The learning curve was analyzed by changes in robot-used time per screw and the occurrence tendency of breached and failed screws according to case accumulation. Results : The clinically acceptable group in RAPSF was 98.12%. In the analysis using the Surgical Evaluation Assistant program, the tip offset was 2.37±1.89 mm, the tail offset was 3.09±1.90 mm, and the angular offset was 3.72°±2.72°. In the analysis of potential risk factors, the difference in screw fixation level (p=0.009) and segmental distance between the tracker and the instrumented level (p=0.001) between the no-breached and breached group were statistically significant, but not for the other factors. The mean difference between the no-breach and breach groups was statistically significant in terms of pedicle width (p<0.001) and tail offset (p=0.042). In the learning curve analysis, the occurrence of breached and failed screws and the robot-used time per screw screws showed a significant decreasing trend. Conclusion : In the current study, RAPSF was highly accurate and the specific potential risk factors were not identified. However, pedicle width was presumed to be related to breached screw. Meanwhile, the robot-used time per screw and the incidence of breached and failed screws decreased with the learning curve.

• 노동경제논집
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• 제33권3호
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• pp.47-88
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• 2010

정부는 2001년 산전후휴가 기간 확대와 산전후휴가와 육아휴직 기간 동안의 보조금 지급을 골자로 하는 모성보호법 개정을 단행하였다. 본 연구는 삼중차감기법을 통해 가임기 여성을 위한 이러한 추가 혜택이 가임기 여성의 고용과 시간당 임금에 미친 영향을 분석한다. 젊은 남성, 나이든 여성, 나이든 남성을 통제집단으로 간주하였을 때, 모성보호법 개정으로 인한 가임기 여성의 고용과 시간당 임금 변화는 없었다. 이는 모성보호법 개정이 가임기 여성의 노동공급과 기업의 가임기 여성에 대한 노동수요에 어떠한 변화도 초래하지 않았음을 의미한다.

• 대한간호학회지
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• 제42권7호
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• pp.957-964
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• 2012

Purpose: This study was conducted to develop a gambling addictive behavior scale for adolescents. Methods: The process involved construction of a conceptual framework, initial item search, verification of content validity, selection of secondary items, and extraction of final items. The participants were 299 adolescents from two middle schools and four high schools. Item analysis, factor analysis, criterion validity, internal consistency, and ROC curve were used to analyze the data. Results: For the final scale, 25 items were selected, and categorized into 4 factors which accounted for 54.9% of the total variance. The factors were labeled as loss of control, life dysfunction from gambling addiction, gambling experience, and social dysfunction from problem gambling. The scores for the scale were significantly correlated with addictive personality, irrational gambling belief, and adolescent's gambling addictive behavior. Cronbach's alpha coefficient for the 25 items was .94. Scale scores identified adolescents as being in a problem gambling group, a non-problem gambling group, and a non-gambling group by the ROC curve. Conclusion: The above findings indicate that the gambling addictive behavior scale has good validity and reliability and can be used with adolescents in Korea.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2004년도 추계학술대회 논문집
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• pp.321-325
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• 2004

Linear motor feed drive systems have been broadly used in machine tools or precision automatic feed systems. Recently, modem machine tools require high speed and high precision feed drive system to achieve high productivity. Unfortunately, a feed drive system, even though it was optimum designed, may experience severe transient vibrations during high-speed operation if its feed rate control is unsuitable. A rough feed rate curve having discontinuity in its acceleration profile causes a serious vibration problem in the feed slides system. This paper presents a feed rate optimization of a machine tool feed slide system, which is driven by a linear motor, for its minimum vibrations. Firstly, a 4-degree-of-freedom lumped parameter model is proposed for the vibration analysis of a linear motor driven machine tool feed drive system. Next, a feed rate optimization of the feed slide is carried out for minimum vibrations. The feed rate curve optimization strategy is to find out the most appropriate acceleration profile with jerk continuity. Of course, the optimized feed rate should approximate to the desired one as possible. A genetic algorithm with variable penalty function was used in this feed rate optimization.