• 한국식품영양학회지
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• 제25권1호
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• pp.205-213
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• 2012

This study investigated the life cycle of menus and made suggestions on the appropriate time for when new menus should be developed. For this purpose, a total of 636 customers who visited 'T' Restaurant more than 25 times in the past three years were used for analysis. After estimating product life cycles based on sales and selling period, an empirical study was conducted. In terms of product life cycle, a growth stage was observed in the category of pasta and pizza in both stores A and B, whereas sales in the rice category stayed constant. Regarding trend in seasonal sales, a big difference was detected between the two stores. While store A was already in the decline stage of the life cycle in all menu categories, store B remained in the growth stage. In terms of menu life cycle, the product life cycle of long-lived products was observed in the pasta category in both stores A and B. While the pizza category was in the growth stage, the product life cycle of long-lived products was observed in the rice category. It is expected that the results of this study could be useful in development of new menus and product life cycle management to fulfill diverse customer needs in the dining-out business.

• 자원환경지질
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• 제4권2호
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• pp.59-75
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• 1971

Orogenic cycle is closely related with sedimentary cycle, and a sedimentary cycle involves the birth, development and disappearance of a sedimentary basin. Paleontological studies have indicated that birth or disappearance of sedimentary basins of separated regions frequently coincided in time. In this paper, the writer presents his assumption on the East Asian analogy of the Hercynian orogenic cycle in accord to the above mentioned generalities. Previous studies, including mine have a corollary that Korea and Southern China, which had been uplifted by the Caledonian movement, changed into low-lying region with subsiding areas in the Givetian time. The writer, thus, thinks that the Hercynian orogenic cycle started in Givetian, and that the Mongolian geosyncline in China, the Gangweon Basin in Korea and the Honshu geosyncline in Japan disappeared in the Ladinian. The writer, therefore, thinks that the Ladinian marks the end of the Hercynian orogenic cycle, but this assumption will have to be rechecked in consideration with the Alpine orogenic cycle. The Late Namurian-Early Bashkirian time, the dividing period between the early and late Hercynian orogenic cycle, is thought to correspond the time of the Hongjeom Series deposition. The writer is also of the view that the Akiyoshi orogenic cycle(T. Kobayashi) corresponds the late Hercynian phase, and that the Abenian movements(M. Minato) corresponds to the range from the late Caledonian phase to the former part of late Hercynian phase.

• 한국의류산업학회지
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• 제21권1호
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• pp.75-87
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• 2019

The purpose of the study was to suggest a cycle wear top jersey improved in mobility. The study developed a new cycle wear with improvement in dissatisfaction factors by planning design, pattern and the functionality of fabric. Considering the amount of sweat and the necessities of compression part, the basic material, the additional compression material, and the mesh material were arranged differently according to areas. The assessment of the developed cycle wear was composed of wearing comfort evaluation by female cyclist, photo analysis and garment pressure evaluation. The developed cycle wear was evaluated and compared with the current cycle wear. As a result of wearing comfort evaluation, the developed cycle wear was evaluated as better than the existing ones in all part, particularly in the areas of reflection tape and materials, partial pressure, pocket size, and prevention of loss. Photo analysis was in agreement with the appearance evaluation of the participants. As a result of garment pressure evaluation, the front neck part was more comfortable and the upper arm, abdomen, and waist area showed higher pressure, so it partially supported the body. This study has significant meaning for developing a new cycle wear top, protecting the body and improving the exercise effect.

• 한국수자원학회논문집
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• 제55권10호
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• pp.749-759
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• 2022

기후변화로 인한 이상기후 현상 증가와 도시화로 인한 불투수면의 증가로 인해 유역 물순환 관리 패러다임이 변화하고 있는 실정이다. 국내외에서는 물순환 왜곡현상을 억제해 줄 수 있는 저영향개발기술을 기반으로 연구가 지속적으로 진행중이다. 본 연구에서는 저영향개발 적용을 하기에 앞서 물순환 왜곡현상을 반영할 수 있는 요소 P, S, R값을 산정하여, 낙동강 유역을 대상으로 148 소유역별 PSR 지수를 산정하였다. PSR지수는 토지피복도 1975년을 기준으로 2019년 현재까지의 불투수면 변화율을 나타내는 압력지수 P, 기준에서 현재까지 각 소유역별 물순환 변화율을 나타내는 현상지수 S, 현시점에서 저영향개발 적용가능 면적 대책지수 R을 산정하여, 표준거리 d값 산정을 통해 PSR지수를 산정한다. PSR 지수값이 낮을수록 우선 관리 유역에 해당하며, 물순환 회복 우선 관리 유역으로는 1(서낙동강A), 2(낙동강하구언), 87(신천하류), 90(금호강하류), 91(진천천), 147(서낙동강B) 등 순으로 산정되었다. 대권역내 소유역별 물순환 우선관리 순서에 따라 효율적으로 저영향개발요소를 적용하면 물순환 왜곡현상 회복에 기여할 것으로 사료된다.

• 방사성폐기물학회지
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• 제9권4호
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• pp.219-230
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• 2011

핵연료주기 분석 연구는 핵연료주기 단계에서 기술들을 분석하고 요건들을 도출하여 국가적 핵연료주기 정책 설정 및 추진을 체계적으로 수행하기 위한 연구이다. 시스템 분석 기술은 대상 시스템의 비교 분석 평가에 활용되며 핵연료주기를 대상으로 하는 경우 각 국가 또는 관심 범위에 따라 다양한 방법이 사용된다. 본 연구에서는 국내 선진 핵연료주기 개발을 위해 필요한 핵연료주기 분석 전략과 함께 이를 위해 사용될 수 있는 분석 기술들을 제시하였다. 핵연료주기 분석은 전략적으로 기술적 분석, 국내외 이해관계, 국가 에너지 프로그램과 연계되어야 한다. 이를 위해 다양한 핵연료주기를 비교하여 제시된 평가 지표에 따라 분석하는 연구는 트레이드 연구 방법을 적용하여 수행할 수 있다. 본 연구를 통한 조사 분석 결과 핵연료주기 분석 전략과 함께 방법적 측면에서 트레이드 연구가 선진 핵연료주기 도출에 활용될 수 있을 것으로 파악되었다. 트레이드 연구에 필수적인 평가지표를 선정하고 각 지표별 핵연료주기에 대한 정보를 얻기 위해서는 기술성숙도 분석 방법과 핵연료주기 시뮬레이터를 활용할 수 있을 것으로 제시하였다. 이들은 핵연료주기의 기술성, 경제성, 환경영향성 등을 비교 평가하여 기술개발을 위한 방향을 제시하고 체계적인 선진 핵연료주기 도출 및 실현에 기여할 것이다.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2006년도 제27회 추계학술대회논문집
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• pp.99-105
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• 2006

발사체는 수많은 서브시스템들로 구성된 복잡한 하나의 대형 시스템이다. 이런 시스템 하나하나를 개발하고, 통합해서 임무를 수행하는 데는 많은 경험과 통합기술이 필요하다. 이런 기술과 경험은 한순간에 얻어지는 것이 아니지만 선진 사례를 통해서 개발절차를 연구해보았다. 발사체 시스템의 크기에 따라서 업무의 성격과 복잡성은 달라질 수 있으나 체계화 된 업무 절차는 동일 할 것으로 판단된다. 여기에 소개한 발사체의 개발과정은 나사에서 수많은 발사체를 개발하면서 경험한 절차를 토대로 프로그램의 수명주기를 통해서 어느 정도 표준화된 것이다. 이 개발단계는 발사체의 수명주기를 통해서 10단계로 구성되었다.

• 한국추진공학회지
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• 제22권6호
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• pp.104-110
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• 2018

액체로켓엔진 작동 모드 해석은 엔진 개발과정에서 설계/시험/분석을 위한 필수 도구이다. 구성품 수락시험 결과를 반영한 엔진 작동 모드 해석은 엔진 시험 결과와 차이를 보인다. 가스발생기 사이클 엔진 작동점 해석 모델에서 엔진 시험 결과를 재현하기 위한 성능 인자를 파악하고 보정 방법을 정의하였다. 연소기, 가스발생기, 터보펌프의 성능과 연소기 배관, 가스발생기 배관의 유량 계수를 보정하여 시험결과와 같은 유량, 압력, 터보펌프 회전수 등 엔진 성능 변수에 상응하는 엔진 해석 모델을 얻었다. 성능 인자 보정을 적용하여 한국형 발사체용 75톤급 엔진의 시스템 해석 모델을 획득하였다.

• 한국기계가공학회지
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• 제18권5호
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• pp.90-95
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• 2019

This study aims to gain the design data through the process design of the organic Rankine cycle, which can produce 250kW of electric power through waste heat recovery. In this study, a simulation was conducted using APSEN HYSYS to make the model for the process design of the 250kW-class waste heat recovery system. For the thermodynamic model, the test was conducted with hot water as the heat source, the water steam as the cooling water for the cooler, and the refrigerant R245FA in the cycle. In the final design, it was expected and found from the simulation that the cycle efficiency was 12.62% and that 250kW of power was produced considering the margin of 80%.

• 한국산업융합학회 논문집
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• 제15권4호
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• pp.117-124
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• 2012

Recent years, many industries acknowledge that environmental substantiality of products must be an essential role and it is one of the major importances for industries to consider the environmental impacts of products at the early stages of product development. This study investigated eco-design parameters and $CO_2-eq$. emissions in each stage of raw material acquisition, manufacturing, transportation, use and disuse in life cycle of touch monitor stand based on Eco-Design. In this study, to fulfill of Eco-Design, the environmental impact assessment of through LCA(Life cycle assessment) was carried out with benchmarking monitor stand and we suggested the direction of new design of touch monitor stand mechanism based on eco-friendly considerations. New design based on LCT(Life Cycle Thinking) showed that the following eco-friendly considerations at the early stage of design to be helpful to reduce GWP(Global Warming Potential) [kg $CO_2-eq$.] in new monitor stand development and it is necessary for Eco-Design process of the product.

• 보건행정학회지
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• 제30권3호
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• pp.270-276
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• 2020

Entering the fourth industrial revolution era, health technology is rapidly developing and the people's needs for medical services are gradually increasing. Establishing a life cycle management of health technology has emerged as a new policy agenda to cope with these changes. However, the management of health technology have been conducted without continuity and with several problems pointed out. Therefore, we suggest the reform agendas by stages to establish system for a life cycle management of health technology in the fourth industrial revolution era as follows. In the stage of development, it is important not only to provide research funding, but also consulting by professional about whole cycle of health technologies. In the phase of market entry, there are needs for enhance the system that would expand the early adoption for innovative technology and increase its effectiveness. After the spread of health technology to clinical settings, a reassessment and post management system should be established that have an institutional framework with strong price adjustment and exit mechanism. Furthermore, we hope that discussions will be brisk in macro perspective on the balancing of development in healthcare industry, health of people and national health insurance finance.