• 한국융합학회논문지
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• 제10권12호
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• pp.271-280
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• 2019

제조산업 분야의 디지털트랜스포메이션의 일환인 스마트공장은 데이터 기반으로 모니터링 및 분석 그리고 예측을 통해서 의사결정 방식을 획기적으로 변화시키고 있다. 특히 설비에 대한 예지보전은 스마트공장의 핵심적인 요소로서 필요성이 증대되고 있다. 본 연구의 목적은 철강 도금공정의 예지보전을 위해 도금로 설비의 열화 특성을 고려한 잔존수명 분석과 예측모델을 산출하는 것이다. 상관성 분석, 다중회귀 분석, 주성분회귀 분석 그리고 시간의 경과에 따른 열화의 추이 파악을 위하여 이동회귀 방식을 제안하여 진행하였다. 그 결과 도금로 열화는 생산성 인자들과 주된 의존적 관계가 있으며, 특히 환경 온도 인자들의 영향성이 열화의 추이 변화에 관계가 있음을 추론할 수 있었다. 예측된 잔존수명을 활용하여 도금로 교체가 필요한 시점을 사전에 알려주는 예지보전을 구현하였다. 향후 설비의 열화 추이 파악에 본 연구에서 수행한 방안이 적절한 사례가 되어 보다 정합성 있는 예지보전 구현이 가능해지기를 기대한다.

• 산업경영시스템학회지
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• 제39권1호
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• pp.153-161
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• 2016

Semiconductor manufacturing has suffered from the complex process behavior of the technology oriented control in the production line. While the technological processes are in charge of the quality and the yield of the product, the operational management is also critical for the productivity of the manufacturing line. The fabrication line in the semiconductor manufacturing is considered as the most complex part because of various kinds of the equipment, re-entrant process routing and various product devices. The efficiency and the productivity of the fabrication line may give a significant impact on the subsequent processes such as the probe line, the assembly line and final test line. In the management of the re-entrant process such as semiconductor fabrication, it is important to keep balanced fabrication line. The Performance measures in the fabrication line are throughput, cycle time, inventory, shortage, etc. In the fabrication, throughput and cycle time are the conflicting performance measures. It is very difficult to achieve two conflicting goal simultaneously in the manufacturing line. The capacity of equipment is important factor in the production planning and scheduling. The production planning consideration of capacity can make the scheduling more realistic. In this paper, an input and scheduling rule are to achieve the balanced operation in semiconductor fabrication line through equipment capacity and workload are proposed and evaluated. New backward projection and scheduling rule consideration of facility capacity are suggested. Scheduling wafers on the appropriate facilities are controlled by available capacity, which are determined by the workload in terms of the meet the production target.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.142-142
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• 2017

Wheat (Triticum asetivum L.) is one of the major grain crops worldwide. The reduced productivity ascribed by adverse environment is increasing the risk of food security. Wheat cultivars have been actively released by public side since 1960s in Korea. Each variety has been developed for superior regional adaptation, pest resistance and mostly high yield. Heat stress tolerance is one of the major parameters that threaten wheat production in Korea. Heat stress during grain filling period has been conceived as critical level and directly influences on wheat production. We evaluated 11 common wheat cultivars ("Baegjoong", "Dajung", "Goso", "Hanbaek", "Jokyoung", "Joeun", "Jopum", "Keumgang", "Olgeuru", "Sinmichal", "Uri") that were exposed to abnormally high temperature during the grain filling period. Each plant was grown well in a pot containing "Sunshine #4" soil in controlled phytotron facility set on $20^{\circ}C$ and 16 h photoperiod. At 9 day-after-anthesis (DAA9), plants were subjected to a gradual increase in temperature from $20^{\circ}C$ to $33^{\circ}C$ and maintained constantly at $33^{\circ}C$ for 5 days. After the treatment, plants were subjected to gradual decrease to normal temperature ($20^{\circ}C$) and continue to grow till harvest. Seeds were harvested from each tiller/plant. Total chlorophyll contents decrease level as well as grain parameters were measured to evaluate varietal tolerance to heat stress. We also divide each spike into five regions and evaluate grain characteristics among the regions in each spike. The obtained results allow us to classify cultivars for heat stress tolerance. The pedigree information showed that typical wheat lines provide either tolerance or susceptible trait to their off-springs, which enable breeders to develop heat stress tolerance wheat by appropriate parental choice.

• 한국실내디자인학회논문집
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• 제20권5호
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• pp.178-187
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• 2011

This research suggested the hygienic spatial composition of sell-service restaurants applying HACCP(Hazard Analysis and Critical Control Point System). The circulation of the food, dishes, waste, workers and customers were each fractionated and arranged according to the hygienic sequence of cooking food in kitchen and process for eating food within the customer space. The spaces were separated by the degree of cleanness(clean area, semi-clean area, contaminated area). After that, hygiene facilities to remove contamination and pass facilities intended to control moving were added at the possible points of cross-contamination in oder to prevent the cross-contamination. For hygienic spatial composition of self-service restaurant, the following should be acknowledged: In the kitchen, spaces in which the food is handled after being heated should be located in the clean area. As of the customer space, spaces where dishes are prepared, food and water is received, and the table hall should be located in the clean area. Food circulation should flow from the contaminated area to the clean area. Food, dishes, waste should be moved through pass facilities so that workers do not have to come and go between other areas of cleanness. Also lockers for private clothes and lockers for uniforms should be separated. Hygiene facilities should be easily accessible so that workers can use them whenever they enter their working area. The contaminated area where dirty dishes are dealed with should be separated from the clean area. Waste should be thrown out without crossing cooking areas. As of customer circulation, the hygiene facility for hand washing should be located near the space where dishes for self-service are placed. The customer circulation should lead customers to leave restaurants after giving back the dirty dishes in the contaminated area.

• 제3의학
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• 제2권2호
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• pp.253-295
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• 1997

It is very critical to specify certain medical personnels in defining the history of certain era. Due to the limited source of information and lack of thorough research, there still aren't enough study grounded on concrete historical investigation. Authors attempted to investigate those medicinal personnels engaged in Three Kingdoms period in terms of the activity area, relation with religion and their role in medical system and medical exchange. The sum of recorded medical personnels in Three Kingdoms period numbers 50 of which 6 belonged to Kokooryo, 18 to Baekje, 7 to Shilla and 19 to Unified Shilla. There might existed far more medical personnels who tried to alleviate the suffering of the people and were not recorded in the documents. The more earlier in times, the more medicine gets the religious tinge. This is not the exception for the period of the Three Kingdoms and those medicine men, wizard doctors and priest doctors were playing important role in healing people and processing crude drugs. The system of royal physician and medical education facility were established and doctors and pharmacists, shamanic doctor, herb collectors, Kongbong's doctor(供奉醫師), Kongbong's diviners(供奉卜師) took leads in medicine in those times. Those folkloric healers also took part in. Korea imported chinese medicine and Japan employed chinese medicine via Korea or directly from China and developed into traditional japanese medicine. In this process those who emigrated from Baekje and Kogooryo and their offsprings took an active part. Since the limited source of information of Three Kingdoms, we only can infer the me야cal environment of those times by featuring the activities of medical personnels.

• 한국수자원학회논문집
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• 제42권7호
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• pp.559-569
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• 2009

환경 및 경제적 문제 등으로 인해 댐과 같은 대규모 수공구조물의 신설이 점차 어려워짐에 따라, 천변저류지 등과 같은 소규모 수공구조물의 설치가 대안으로 검토되고 있다. 천변저류지와 같은 소규모 수공구조물의 경우 홍수량, 유입수문곡선, 천변저류지 용량 및 월류위어의 월류고 등에 따라 홍수저감효과가 민감하게 반응하므로, 대상 저류지의 제원 결정을 위해 목표하는 설계빈도 결정이 선행되어야 한다. 또한 천변저류지를 이용하여 목표하는 홍수저감효과를 얻기 위해 다수의 천변저류지가 설치되어야 하며, 즉 천변저류지군의 홍수조절효과는 이들 저류지군을 연계한 수문네트워크의 분석에 의해 산정되어야 한다. 본 연구에서는 설계빈도 변화에 따른 천변저류지군의 홍수저감효과를 산정해 보았으며 산정된 홍수저감효과를 분석하여 천변저류지의 최적위치를 선정하기 위한 새로운 지수를 제안하였다. 천변저류지의 최적위치를 결정하기 위해 개발된 기존의 의사결정모형을 보완하여 제안된 지수를 산정하기 위한 모형을 개발하였으며, 개발된 모형을 안성천유역에 적용하여 기존의 연구결과와 비교하고, 적용성을 검토하였다. 그 결과 천변저류지 최적위치를 결정하기 위한 기준으로의 활용이 가능한 것으로 판단되었다.

• Journal of Astronomy and Space Sciences
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• 제30권1호
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• pp.49-58
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• 2013

ARGO-M is a satellite laser ranging (SLR) system developed by the Korea Astronomy and Space Science Institute with the consideration of mobility and daytime and nighttime satellite observation. The ARGO-M optical system consists of 40 cm receiving telescope, 10 cm transmitting telescope, and detecting optics. For the development of ARGO-M optical system, the structural analysis was performed with regard to the optics and optomechanics design and the optical components. To ensure the optical performance, the quality was tested at the level of parts using the laser interferometer and ultra-high-precision measuring instruments. The assembly and alignment of ARGO-M optical system were conducted at an auto-collimation facility. As the transmission and reception are separated in the ARGO-M optical system, the pointing alignment between the transmitting telescope and receiving telescope is critical for precise target pointing. Thus, the alignment using the ground target and the radiant point observation of transmitting laser beam was carried out, and the lines of sight for the two telescopes were aligned within the required pointing precision. This paper describes the design, structural analysis, manufacture and assembly of parts, and entire process related with the alignment for the ARGO-M optical system.

• 융합보안논문지
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• 제15권6_1호
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• pp.69-78
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• 2015

산업스파이에 의한 핵심기술 유출이 점차 지능화, 첨단화, 복잡화 되어가고 있으며 이로 인한 피해 또한 심각해지고 있다. 이러한 상황에 대응하는 방안으로 융합보안이 대두되었고 모든 산업분야에 점차 확대되고 있다. 특히 국가적 핵심기술과 인력 및 시설을 포함하고 있는 방위산업은 융합보안이 더 요구되는 산업분야이다. 방위산업은 국가의 안전보장에 필요한 방위산업물자를 연구, 개발, 생산하는 산업이다. 방위산업은 군사기밀, 산업비밀, 핵심기술인력, 방위산업물자, 국가중요시설, 정보통신체계 등 다양한 보안요소를 포함하고 있다. 방위산업보안은 군사보안과 산업보안의 복합체이며 방위산업의 모든 보안요소를 통합하는 융합보안이다. 따라서 방위산업보안은 융합보안의 대표적인 실천모델이라고 할 수 있다. 방위산업보안에 대한 연구는 일반적인 다른 산업분야에서의 보안과 관련된 연구에 비해 미흡한 실정이다. 방위산업의 핵심기술 유출을 방지하고 기술인력 및 시설을 보호하기 위해서, 방위산업보안을 융합보안의 개념에서 연구하고 실천하는 노력이 절실한 시점이다.

• 한국건설관리학회논문집
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• 제8권2호
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• pp.155-163
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• 2007

건설프로젝트를 수행하는 과정에 있어 계약당사자간에 다양한 계약방식에 기초하여 시설물 건설에 요구되는 업무 또는 서비스를 제공하고 있으나, 건설사업의 주요 성과지표라 할 수 있는 비용, 일정, 안전등의 측면에서 계약방식에 따라 발생할 수 있는 성과의 차이에 대한 실증적 인 비교연구는 미흡한 실정이다. 건설사업이 다수의 건설전문조직과 계약을 기반으로 운영되는 프로젝트라는 특성을 고려할 때 계약방식의 유형에 따라 사업성과에 대한 차이를 비교분석 함으로써 계약방식 선정에 대한 적정 의사결정을 지원하는데 유효한 자료를 제공할 수 있다. 이에 본 연구에서는 건설계약방식 중 실비정산방식과 총액계약방식을 대상으로 건설사업의 주요 성과에 대한 비교 분석을 시도하였다. 계약방식별 프로젝트 성과는 미국 Construction Industry Institute(CII)의 Benchmarking and Metrics(BM&M) 프로그램에서 활용하는 성과측정기준을 기초로 비용, 공정, 안전, 변경, 재작업(rework) 등 5개 분야를 대상으로 하였다. 또한 계약방식으로 인한 각종 성과지표의 차이가 통계적 의미를 지니고 있는가를 판단하기 위하여 통계적 기법인 t-test를 이용하여 데이터의 유의성을 분석하였다.

• 대한영양사협회학술지
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• 제12권3호
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• pp.264-276
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• 2006

The purpose of this study was to propose HACCP system implementation properly and to secure the food safety of school foodservices in Pohang city since the proper facilities and equipment should be key factors in food safety and production. So this study was designed to evaluate existing equipment in food production area, receiving and dining area, and employee facilities. Questionnaire was mailed to 107 school foodservice dietitians in Pohang area and 97 were responded (90.7% response rate). Approximately sixty percent of foodservices were not available separate receiving or polluted area, fifty one percent were installed screen door for insecticidal and temperature and humidity control, and these environmental conditions were hard to keep kitchen dry and sanitary condition. Usually public schools were better equipped than private schools. Forty three percent of school foodservice had initial use of non-foodservice, opened before 1994, and thirty three percent of elementary school foodservice. Among employee facilities, hand washing sanitation stand was prepared seventy nine percent (78.9%) of school foodservices. Dietitians chose outworn equipment and facilities (30.9%), difficulties of maintaining standard temperature and humidity for foodservice (20.6%), lacking separate receiving or polluted area (13.4%), indirect contamination of water hoss (10.3%), and lacking employee facilities (10.3%) as critical points to correct in school foodservice. Therefore governmental regulating agencies must review and approval of plans prior to new construction or extensive remodeling of school foodservice facilities. In addition to these requirement, plan must be set-up step by step to implement HACCP system properly.