• Journal of the Korean Data and Information Science Society
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• 제24권4호
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• pp.803-813
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• 2013

전자상거래에서 상품의 구입은 오프라인에서 구매하는 방식과는 차이가 있다. 오프라인에서 상품추천은 판매원의 추천에 의해 이루어지지만 온라인에서 상품 추천은 판매원이 상품 추천을 할 수가 없기 때문에 오프라인과는 다른 형태의 상품을 추천하게 된다. 추천시스템은 온라인 상거래에서 상품을 추천하는 방법으로 기존 상품을 구입한 고객의 선호도를 기반으로 상품을 구입하려는 고객의 선호도를 예측하여 추정된 선호도가 높은 상품을 고객에게 추천하는 방법이다. 협력적 필터링 알고리즘은 전자상거래의 상품추천 추천시스템에 사용되며 추정된 값들로 추천 상품 목록을 만들고 그 목록을 고객에게 추천을 하는 것이다. 이 논문에서 사용된 데이터집합은 Movielens 데이터집합인 100k 데이터집합과 1 million 데이터집합이며 일반화를 위해 2개의 데이터집합에서 유사한 결과를 도출하여 일반화시키고자 한다. 영화 추천시스템의 새로운 알고리즘을 제안하기 위해 기존의 알고리즘과 변형된 알고리즘에 의해 추정된 추정값들의 분포 특징을 분석과 응답자별로 분류해서 응답자별 분포의 특징을 분석하였다. 이 논문에서는 이웃기반 추천시스템 협력적 필터링 알고리즘을 개선하기 위해 기존의 알고리즘과 변형된 알고리즘을 바탕으로 새로운 알고리즘을 제안하였다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2006년도 춘계학술대회논문집
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• pp.726-729
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• 2006

As a active soundscape facility, P.A. system is a useful instrument to give place identity and vitality by letting out music, environmental music, bird singing sound etc. In this study, to know the optimistic distance and sound level range of introducing sound, sound levels due to distance were measured and subject responses were checked by questionnaire. Levels from 64dB to 71dB are recommended by subjects. And the optimistic level of introducing level is related with level variance of sound source. The results of this study could used for street furniture location design and P.A. system output level.

• KIEAE Journal
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• 제10권6호
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• pp.41-46
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• 2010

This study is to validate the K University daylight measurement system according to the CIE guide of recommended practice of daylight measurement. In this study global irradiance, illuminance, direct normal illuminance, diffuse irradiance, illuminance and vertical illuminances(North, West, South, East) were measured and compared in accordance with the CIE quality control test. Field monitoring was conducted from 1st August to 15th August 2010. Results for the CIE tests 1 to 4 showed an accuracy of 100%. This indicates that the K University daylight measurement system is reliable and the measurement data would be useful for further daylight researches.

• 항공우주시스템공학회지
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• 제1권4호
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• pp.42-45
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• 2007

The process of Lay-out design and assembly for liquid rocket engine was presented and the Lay-out design for main components of liquid Rocket engine system was studied. Vertical direction is recommended in the case of turbopump's arrangement. If the length of pipe between gas-generator with turbopump's turbine is shorter, gas-generator is stable. The arrangements of main valves are recommended as near disposition to combustion chamber, because shut-down process time is shorter. Interference with launch vehicle and structural strength considering gimbal actuator's force and control performance is considered in the case of gimbal actuator's supporter design.

• 한방안이비인후피부과학회지
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• 제31권4호
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• pp.83-95
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• 2018

Objectives : This study was conducted to review about a prevention and management of acne Methods : We searched Korean research database by using keyword 'acne' and 'prevention' or 'management'. Korean research databases were Korean Studies Information Service System(KISS), Research Information Service System(RISS), Korean Medicine Information System(OASIS), National Digital Science Library(NDSL) and Jeonju Municipal Library. We classified studies identified by year, method, contents Results : Among 19 studies, 10 studies were articles and 9 studies were books. The proportion of studies published in 1990s was 26.3%, published in 2000s was 46.3%, published in 2010s was 26.3%. We analyzed 19 studies by classifying 4 categories that consist of Diet Management, Skin Management, Life Management, Exercise Management. In Diet Management, intake of fruits and vegetables was highly recommended, and intake of oily foods and high-fat foods was restricted. In Skin Management, thorough skin cleansing was highly recommended and skin contact was restricted. In Life Management, enough sleep and rest were highly recommended, and smoking was restricted. In Exercise Management, some of exercises to promote blood circulation were recommended. Conclusions : Various methods have been used for prevention and management of acne. It is necessary to systematically study the prevention and management of acne.

• Clinical and Experimental Emergency Medicine
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• 제5권4호
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• pp.256-263
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• 2018

Objective We conducted a study to validate the effectiveness of the Korean criteria for trauma team activation (TTA) and compared its results with a two-tiered system. Methods This observational study was based on data from the Korean Trauma Data Bank. Within the study period, 1,628 trauma patients visited our emergency department, and 739 satisfied the criteria for TTA. The rates of overtriage and undertriage in the Korean one-tiered system were compared with the two-tiered system recommended by the American College of Surgery-Committee on Trauma. Results Most of the patient's physiologic factors reflected trauma severity levels, but anatomical factors and mechanism of injury did not show consistent results. In addition, while the rate of overtriage (64.4%) was above the recommended range according to the Korean criteria, the rate of undertriage (4.0%) was within the recommended range. In the simulated two-tiered system, the rate of overtriage was reduced by 5.5%, while undertriage was increased by 1.8% compared to the Korean activation system. Conclusion The Korean criteria for TTA showed higher rates of overtriage and similar undertriage rates compared to the simulated two-tier system. Modification of the current criteria to a twotier system with special considerations would be more effective for providing optimum patient care and medical resource utilization.

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제11권11호
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• pp.447-454
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• 2022

4차 산업혁명 시대를 맞아 우리는 정보의 홍수 속에 살고 있다. 이런 환경에서 우리에게 필요한 정보를 찾기란 매우 어렵고 복잡하다. 따라서 정보의 홍수 속에서 추천 시스템은 필수적이다. 이러한 추천 시스템 중 영화, 음악, 음식, 의류의 각각에 대한 추천 시스템들은 많은 연구가 진행되어 왔다. 현재까지 대부분의 개인화 추천 시스템들은 개인의 성향인 나이, 장르, 지역, 성별 등을 체크해서 옷들을 추천한다던가, 책들을 추천한다던가, 영화들을 추천해왔다. 미래 세대에서는 나이, 장르, 지역, 성별 등을 체크해서 옷, 책, 영화들을 한꺼번에 추천 받기를 원할 것이다. 본 논문에서는 사용자의 감정과 날씨에 따라 개인 맞춤형 옷과 음식을 한꺼번에 추천하는 추천 시스템을 제안한다. 소셜미디어인 트위터에서 사용자의 데이터를 얻었고, 트윗을 기반으로 감정 분석을 해서 Paul Eckman 이론에 따라 사람의 6 가지의 기본 감정으로 분류했다. 이렇게 얻어진 기본 감정을 Hayashi의 Quantification Method III를 적용하여 색깔로 변환하였으며, 이러한 색깔은 추천하는 옷의 색상으로 표현하였다. 또한, visualcrossing.com API의 날씨 정보를 이용하여 의류의 종류를 추천한다. 그리고 감정에 따른 컴포트 푸드의 내용에 따라 다양한 음식을 추천한다.

• 시스템엔지니어링학술지
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• 제17권2호
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• pp.1-8
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• 2021

This study proposes a systems engineering approach for the development of an advanced planning & scheduling (APS) system for a cosmetic case manufacturing factory. The APS system makes production plans and schedules based on the injection process, which consists of 27 plastic injection machines in parallel to control recommended inventory of products. The system uses machine operation/failure information and defective product/work-in-process tracking information to support intelligent scheduling. Furthermore, a genetic algorithm model is applied to handle the complexity of heuristic rules and machine/quality constraints in this process. As a result of the development, the recommended inventory compliance rate is improved by scheduling the 30-day production plan for 15 main products.

• Structural Engineering and Mechanics
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• 제81권1호
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• pp.51-57
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• 2022

The problem of optimal stochastic GA control of the system with uncertain parameters and unsure noise covariates is studied. First, without knowing the explicit form of the dynamic system, the open-loop determinism problem with path optimization is solved. Next, Gaussian linear quadratic controllers (LQG) are designed for linear systems that depend on the nominal path. A robust genetic neural network (NN) fuzzy controller is synthesized, which consists of a Kalman filter and an optimal controller to assure the asymptotic stability of the discrete control system. A simulation is performed to prove the suitability and performance of the recommended algorithm. The results indicated that the recommended method is a feasible method to improve the performance of active tuned mass damper (ATMD) shear buildings under random earthquake disturbances.

• 지역연구
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• 제8권1호
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• pp.99-118
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• 1992

In spite of the rapid development of information and computer technology, the software side of those technologies has not been well studied especially in the area of regional planning. Throughout this study we identified some critical facts as below: 1) the necessity of region-specific information which is vital for urban and regional development, 2) the necessity of integration of information system into a regional unit rather than setoral unit, 3) aggravated regional inequality through the spread of communication and computing tools, and 4) advanced regional information system linking satellite and graphic computers in developed countries. From these facts, we recommend some policy directions as below: 1) It is desperately needed to establish a regional information center covering large administrative area. 2) In establishing these system, we can utilize existing communication network or estblish a brand new system. Utilization of existing administrative network and board of statistics for data collection and management, and the utilization of postal office or telephone company for distribution are recommended through the evaluation of those two alternatives, 3) It is also recommended that one-step data collection system should be established. 4) The Dat Base should be organized in many steps in close relationship with development goal and planning process. In order to make most use of this system, we need to develop a monitoring system, regional indicators and ex-ante impact studies.