인접성 데이터를 이용한 추천시스템

김진화,변현수,Kim, Jin-Hwa,Byeon, Hyeon-Su 한국데이터정보과학회 2011 한국데이터정보과학회지 Vol.22 No.1

Recommendation systems are developed to overcome the problems of selection and to promote intention to use. In this study, we propose a recommendation system using adjacency data according to user's behavior over time. For this, the product adjacencies are identified from the adjacency matrix based on graph theory. This research finds that there is a trend in the users' behavior over time though product adjacency fluctuates over time. The system is tested on its usability. The tests show that implementing this recommendation system increases users' intention to purchase and reduces the search time. 온라인 사용자에게 선택의 어려움을 줄여주고 사용의도를 높이기 위해 만들어진 것이 추천시스템이다. 추천시스템은 정보검색과 정보필터링을 용이하게 하고, 정보 과잉의 문제를 해결하는 데에 많은 도움을 주고 있다. 본 연구의 목적은 웹 상점을 이용하는 사용자들의 클릭스트림 데이터를 분석하여 데이터 인접성의 차이를 확인하고, 이를 통해 상품추천을 제안하고자 하는 데에 있다. 본 연구에서 제안하는 추천시스템의 성과를 검증하기 위하여 실험을 통해 알아본 결과, 추천시스템 적용 전보다 적용 후에 사용자들의 구매 의도는 높아졌고 탐색시간은 줄어들었다.

사람 섬유아세포에서 UVB 조사에 대한 능소화 추출물의 항산화 효과

김진화,이범천,표형배,Kim, Jin-Hwa,Lee, Bum-Chun,Zhang, Yong-He,Pyo, Hyeong-Bae 대한약학회 2005 약학회지 Vol.49 No.2

The human skin is constantly exposed to environmental irritants such as ultraviolet, smoke, chemicals. Free radicals and reactive oxygen species (ROS) caused by these environmen tal facts play critical roles in cellular damage. These irritants are in themselves damaging to the skin structure but they also participate the immensely complex inflammatory reaction. The purpose of this study was to investigate the skin cell protective effect of Campsis grandiflora extract on the UVB-irradiated human dermal fibroblasts (HDFs). We tested free radical and superoxide scavenging effect in vitro. C. grandiflora extracts had potent radical scavenging effect by 82% at $100{\mu}g/ml$, respectively. For testing intracellular ROS scavenging activity the cultured HDFs were analyzed by increase in DCF fluorescence upon exposure to UVB 20 $MJ/cm^2$ after treatment of C.grandiflora extracts. The results showed that oxidation of CM-DCFDA was inhibited by C.grandiflora extracts effectively and C.grandiflora extracts has a potent free radical scavenging activity in UVB- irradiated HDFs. In ROS imaging using confocal microscope we visualized DCF fluorescence in HDFs directly. In conclusion, our results suggest that C.grandiflora can be effectively used for the prevention of UV-induced adverse skin reactions such as radical production, and skin cell damage.

인지 매핑을 이용한 정보 필터링 시스템

김진화,이승훈,변현수,Kim Jin-Hwa,Lee Seung-Hun,Byun Hyun-Soo 한국지능정보시스템학회 2006 지능정보연구 Vol.12 No.2

정보 필터링 시스템은 사용자의 요구를 충족시킬 수 있도록 설계되어 있으나 변화가 심한 사용자의 정보 요구를 충족시키기에는 정확도 저하 등의 문제점이 있다. 본 연구에서는 인간의 뇌에서의 정보처리과정을 시뮬레이션하는 인지적 브레인 매핑의 정보 필터링 시스템을 제안한다. 특정 단어나 패턴에 기초하여 필터링하는 기존의 필터링 시스템과 비교할 때 제안하는 필터링 시스템은 키워드와 키워드간의 관계를 이용하여 필터링을 하는 시스템이다. 본 연구는 키워드와 키워드간의 관계를 이용하여 정보를 기록저장하고, 저장된 정보를 지도화하여 필터링에 응용하는 것이다. 키워드를 이용한 필터링 방법과 키워드간의 관계를 이용하여 필터링하는 방법을 통합하여 필터링을 실시하고 필터링 성능에 영향을 미치는 방법을 검증하기 위해 각 방법별로 가중치를 적용하여 최적의 결합가중치를 도출해낸다. Information filtering systems, which are designed fur users' needs, do not satisfy user's diverse requests as their filtering accuracy is unstable sometimes. This study suggests an information filtering system based on cognitive brain mapping by simulating the processes of information in human brain. Compared to traditional filtering systems, which use specific words or pattern in their filtering systems, the method suggested in this article uses both key words and relationships among these words. The significance of this study is on simulating information storing processes in human brain by mapping both key words and their relationships among them together. To combine these two methods, this study finds balances in representing two methods by searching optimal weights of each of them.

브랜드 아파트의 이미지와 자아이미지의 일치성에 관한 연구

김진화,이윤정,정준현,Kim, Jin-Hwa,Lee, Youn-Jung,Jeong, Jun-Hyun 한국주거학회 2010 한국주거학회 논문집 Vol.21 No.2

The trend in which an apartment is regarded as not only a substantial property or 'residence' but also as a 'means of self-expression' for consumers is increasing in the present housing marketing, and thus, the apartment brand image has become an important field of marketing management. Therefore, the present study aimed to verify the difference between the image of a housing brand and the self-image of consumers in order to propose a singular direction of strategies for the formation of a differentiated brand image. As a result of research, analysis showed that there is a trend in which consumers show a more positive attitude towards a brand apartment that has a brand image closer to an ideal selfimage. Even if this trend is weak, it was confirmed that the consentaneity between a brand image and the self-image of housing products can become a variable having some influence on brand attitude. The survey method compared a brand image and a self-image by using Likert's 5-point scale on the apartment brands of the top three companies according to the study result of a national brand competitiveness index (NBCI). Self-consentaneity was determined by using the distance measurement model of self-consentaneity proposed by Sirgy (1982). The study data was collected from 210 persons and the PASW program was used for statistical data analysis.

악관절 관절원판 위치변화가 관절원판 형태 및 골변화에 미치는 영향

김진화,이완,이병도,Kim Jin-Hoa,Lee Wan,Lee Byung-Do 대한영상치의학회 2006 Imaging Science in Dentistry Vol.36 No.1

Purpose : The objective of this study was to investigate the effect of TMJ disc displacement on the TMJ disc configuration and surrounding osseous structure. Materials and Methods : The proton density and 72-weighted MR images of 57 TMJs were retrospectively studied. These TMJs were divided into three groups according to the anterior disc displacement status on MR sagittal images, those were the normal, anterior disc displacement with reduction (ADWR), anterior disc displacement without reduction (ADWOR). The frequency of disc configuration and surrounding bony change, the border status between articular disc and retrodiscal tissue were investigated according to the positional change of articular disc. Results : There were significant statistical differences of chi-square statistics of TMJ disc configurational type between normal and ADWR/ADWOR group, respectively. Surrounding bony change frequently appeared in ADWOR and a statistically significant difference of chi-square statistics of bony change frequency between normal and ADWOR group was observed. Conclusion : These results suggested that the disc configuration and bony change of TMJ are strongly related to TMJ disc displacement.

새로운 복합모드로직과 사인선택 Booth 인코더를 이용한 고성능 32$\times$32-bit 곱셈기의 설계

김진화,송민규,Kim, Jin-Hwa,Song, Min-Gyu 대한전자공학회 2001 電子工學會論文誌-SD (Semiconductor and devices) Vol.38 No.3

본 논문에서는 CMOS 로직과 pass-transistor logic(PTL)의 장점만을 가진 새로운 복합모드로직(Compound Mode Logic)을 제안하였다. 제안된 로직은 VLSI설계에서 중요하게 부각되고 있는 저전력, 고속 동작이 가능하며 실제로 전가산기를 설계하여 측정 한 결과 복합모드 로직의 power-delay 곱은 일반적인 CMOS로직에 비해 약 22% 개선되었다 제안한 복합모드 로직을 이용하여 고성능 32×32-bit 곱셈기를 설계 제작하였다. 본 논문의 곱셈기는 개선된 사인선택(Sign Select) Booth 인코더, 4-2 및 9-2 압축기로 구성된 데이터 압축 블록, 그리고 carry 생성 블록을 분리한 64-bit 조건 합 가산기로 구성되어 있다. 0.6um 1-poly 3-metal CMOS 공정을 이용하여 제작된 32×32-bit 곱셈기는 28,732개의 트랜지스터와 1.59×l.68 ㎜2의 면적을 가졌다. 측정 결과 32×32-bit 곱셈기의 곱셈시간은 9.8㎱ 이었으며, 3.3V 전원 전압에서 186㎽의 전력 소모를 하였다. In this paper, a novel compound mode logic based on the advantage of both CMOS logic and pass-transistor logic(PTL) is proposed. From the experimental results, the power-delay products of the compound mode logic is about 22% lower than that of the conventional CMOS logic, when we design a full adder. With the proposed logic, a high performance 32$\times$32-bit multiplier has been fabricated with 0.6um CMOS technology. It is composed of an improved sign select Booth encoder, an efficient data compressor based on the compound mode logic, and a 64-bit conditional sum adder with separated carry generation block. The Proposed 32$\times$32-bit multiplier is composed of 28,732 transistors with an active area of 1.59$\times$1.68 mm2 except for the testing circuits. From the measured results, the multiplication time of the 32$\times$32-bit multiplier is 9.8㎱ at a 3.3V power supply, and it consumes about 186㎽ at 100MHz.

평생교육사 직무모델 개발 및 타당화 연구

김진화(Kim Jin-Hwa),김한별(Kim Hanbyul),고영화(Ko Young-Hwa),김소현(Kim So-Hyun),성수현(Sung Su-Hyun),박새봄(Park Sae-Bom) 한국평생교육학회 2008 평생교육학연구 Vol.14 No.1

  본 연구의 목적은 평생교육 실천현장에서 평생교육사가 수행하고 있는 업무와 직무모델과의 연계성을 확보하기 위해 평생교육 실천 영역별로 평생교육사의 직무를 객관적으로 확인ㆍ분석하여, 평생교육사의 직무모델을 설정하고 확인 및 검증하는 것이었다. 이러한 목적을 달성하기 위해 적용된 연구방법은 활동분석 및 경험채집방법, 직무분석 워크숍, 직무모델 타당성 확인을 위한 조사연구이었다. 본 연구를 통해서 밝혀진 결과는 첫째, 기존의 평생교육사 직무모델이 현장과의 적합성이 미비한 것으로 확인되었다. 둘째, 평생교육사 직무모델을 9개 책무와 각 영역별 8개 과업으로 개발하였다. 셋째, 평생교육사의 새로운 직무모텔에 대한 타당성이 실증적으로 확인되었다.<BR>  본 연구를 통해 개발된 직무모델은 다음과 같은 의미를 갖는다. (1)새로운 평생교육사의 직무모델은 9개의 책무 즉, 조사 및 분석, 기획 및 계획, 네트워킹, 프로그램개발, 운영 및 지원, 교수 및 학습, 변화촉진, 상담 및 컨설팅, 평가 및 보고 등으로 개발되었으며, 각 책무에 대해 각각 8개의 과업이 균형 있게 제시되었다. (2)기존 모델에 없었던 조사 및 분석과 변화촉진의 책무가 새로운 직무모델에 포함되어 평생교육사가 수행해야 할 전문영역에 대한 특성이 반영되었다. (3)새로운 직무모델은 평생교육사가 실천현장에서 수행하고 있는 업무내용 중심으로 과업을 설정함으로써 절차 중심의 일반론적인 과업의 한계를 극복하였다. (4)급속히 확산되고 있는 평생교육 실천현장 영역의 특성을 고르게 반영함으로써 새로운 직무모델은 표준 직무로 활용할 수 있는 가능성을 제 공하였다.   The purpose of this study was to develop and validate empirically the lifelong educator"s job model matching with the fields of lifelong education. The study started with the identification of lifelong educator"s duties and tasks which has been performed in the field of korean lifelong education through the activity analysis and lifelong educator"s activity during last one year and sampling an experience at present. The specific techniques of the study were activity analysis, experience sampling method, workshop(DACUM), investigation.<BR>  The findings of this study were as follows. Firstly, it was identified that the existing lifelong educator"s job model had mismatched considerably with korean lifelong education fields. Secondly, it was developed the new lifelong educator"s job model composed of 9 duties and 72 tasks. The duties were composed of the investigation, the planing, the networking, the program development, the operation and support, the teaching and learning, the changing facilitation, the counseling and consulting, the evaluation and presentation. Thirdly, it was tested empirically the validation of the new job model.<BR>  The findings suggest that the new job model present impartially the duties and tasks performed in korean lifelong education fields, include the changing facilitator and the analyzer as a new role of lifelong educator, draw the practical tasks beyond general tasks matching with the fields of korean lifelong education, and provide the possibilities as the standard job model of the lifelong educator in Korea.

온라인 리뷰를 활용한 사용자 이해 및 서비스 가치 증대

김진화 ( Jin Hwa Kim ),변현수 ( Hyeon Su Byeon ),이승훈 ( Seung Hun Lee ) 한국정보시스템학회 2011 情報시스템硏究 Vol.20 No.2

The Web has become an excellent source for gathering consumer opinions. There are now numerous Web sites containing such opinions, e.g., customer reviews of products, forums, discussion groups, and blogs. This paper focuses on online customer reviews of products. It makes some contributions. Especially it proposes minimalism and chunking framework for analyzing and comparing consumer opinions of competing products. Users are able to clearly see the strengths and weaknesses of each product in the minds of consumers in terms of various product features. This comparison is useful to both potential customers and product manufacturers. For a product manufacturer, the comparison enables it to easily gather marketing intelligence and product benchmarking information. In this paper, we only focus on mining opinion/product features that the reviewers have commented on. Five types of online review presentations are presented to mine such features. Our experimental results show that these techniques are useful to identify customers` opinions and trends.

인공지능을 이용한 개인의 소득 예측 사례

김진화(Jinhwa kim),Arun Doddapaneni 한국지능정보시스템학회 2011 한국지능정보시스템학회 학술대회논문집 Vol.2011 No.5

In this study customer income is predicted using U.S. census data employing data mining techniques. A comparative performance analysis of decision tree c5.0, back propagation neural networks, and linear regression models is conducted. This study also suggests the strategic implications of the results from the customer relations perspective for marketing strategy in practice and these results have various practical implications to retail banks with regards to decision making and strategic planning. This can also be applied for fraud detection of income gaps between predicted and actual incomes. The results show that decision tree c5.0 outperforms other models in predictability hence focusing more on decision tree and its advantages in lieu of prediction accuracy. In the mean time a set of decision rules are also extracted from the trained decision tree c5.0 in order to improve the clarity and explicability of the income prediction model.

의미 확산을 이용한 잠재 의미 색인 방법

김진화(Jin-Hwa Kim),김용혁(Yong-Hyuk Kim) 한국정보과학회 2010 한국정보과학회 학술발표논문집 Vol.37 No.1C

잠재 의미를 색인하는 것은 문서 색인에 있어서 그 색인 품질에 주요한 요인을 차지한다. 본 논문에서 살펴보는 의미 확산 방법은 문서 집합에 나타나는 단어들의 의미적 연관성을 바탕으로 활성화 작용 모델(spreading activation model)을 구축하고 색인 대상 문서의 단어 분포를 출발점으로 삼아, 그 모델 안에서 의미적으로 수렴할 수 있도록 랜덤 워크 방법(random walk method)을 수정한 변형 방법을 이용해 확률을 확산시킨다. 이 방법은 단어 사이의 연관성을 따라 탐색하며 동의어와 다의어 등 단순 단어 일치로는 알 수 없는 의미적 유사 단어들이 의미 있는 확률 분포를 갖게 한다. 이는 단어들의 의미 분포를 가중치 그래프를 통해 보다 합리적으로 다루게 된다. 실험에서는 문서 분류를 시행하여 평균 정확도 및 정확도-재현율 곡선을 산출하였고, 비교 실험을 통해서 전반적인 우수성을 관찰할 수 있었다.