온라인 쇼핑몰의 상품추천 시스템의 설계 및 실험 : 상품의 최신성을 고려한 사례기반추론 접근

배정연,김민용,권오병 경희대학교 기업경영연구소 2006 기업경영연구 Vol.12 No.1

고객의 구매를 직접적으로 유도하는 판매원이 존재하지 않는 온라인 쇼핑몰에서는 고객 스스로가 상품에 데한 정보를 획득-분석하여 구매의사결정을 해야 하는 한계점이 상존한다. 이를 해결하기 개발된 것이 온라인 쇼핑몰의 상품추천 시스템(Product Recommendations System)인데, 이 시스템은 웹상에서 획득한 고객정보와 고객구매이력 정보를 바탕으로 동일고객 혹은 유사 고객에게 적절한 상품을 추천하는 것이다. 이런 상품추친 시스템을 구현하기 위한 추천기법으로 사례기반추론이 가장 놀리 사용되어 왔다. 그런데, 기존 연구는 문제와 사례간의 특성이 ‘얼마나 유사한가?’에 초점을 두었기 때문에 베스트셀러에 해당하는 상품만이 계속 추친될 가능성이 높았다. 이런 단점을 보완하고 추천 상품의 다양성 및 마케팅 관점을 반영하기 위해 본 연구에서는 유사성과 합께 상품의 최신성을 동시에 고려하는 CBR-PR(Product Recency) 기반의 상품추천 시스템을 설계하고 그 성능을 실제 온라인 쇼핑몰의 데이터를 이용하여 실험하였다. 실험결과 본 연구에서 제안하는 CBR-PR 기법이 기존 기법에 비해 추천 적중률이 모두 높았다. Product recommendation systems have been widely advocated as a way of coping information overload for potential customers in purchasing products at the online shopping mall. To enhance the accuracy of product recommendations, a wide variety of techniques has been developed. Among these, CBR(Case-basyd Reasoning) is one of the most frequently used techniques. However, traditional CBE technique mainly focuses the similarity between current problem and past cases and hence it tends to by biased toward best selling products recommendation. To overcome this limitation and incorporate marketer's view, we designed CBR-PR(Product Recency) technique which considered not only product similarity but also the product rycency. In our paper rycyncy is measured not by the production date but by the launch date for the new product. Using real-world data, we also conducted the several experiments to compare performances of our approach with that of the traditional CBR. Experimental results showed that CBR-PR scored the better recommendation accuracy ratio than traditional CBR in every experimental settings.

임상 증상이 심하지 않은 심낭 삼출 환자의 장기 추적 결과

배장호,김기식,강미숙,남명희,김미정,김민수,김기영,님창욱,김윤년,김권배,정시전,김여희 대한순환기학회 1999 Korean Circulation Journal Vol.29 No.7

간암세포에서 저산소증에 의해 유도되는 VEGF의 발현기작에 대한 연구

권유욱,배수경,김정애,김규원,박병채 영남대학교 약품개발연구소 1997 영남대학교 약품개발연구소 연구업적집 Vol.7 No.-

Puropse: Hepatocellular carcinoma (HCC), a typical hypervasculized tumor is very sensitive to hypoxia and vascular endothelial growth factor (VEGF) has previously been identified to be up-regulated in response to hypoxia in several cell types. However, the molecular mechanisms by which hypoxia is sensed by the cells remain enigmatic. To investigate whether calcium and AP-1 are involved in hypoxia-sensing mechanism, we performed following experiments. Materials and Methods: Hep3B cells were grown in hypoxic condition. To assess cell viability, MTT assay was performed. To investigate the effect of calcium and AP-1, northern blot analysis was performed after treatment with BAPTA/AM. Results: The expression of VEGF was significantly up-regulated by hypoxia in Hep3B, hepatocellular carcinoma cell line. The increased expression of VEGF induced by hypoxia was blocked by the addition of BAPTA/AM, a cytosolic calcium chelator to the media. In addition, we found that the expression of c-jun protooncogene was also up-regulated by hypoxia. Hypoxic increase of c-jun expression was also normalized by the treatment with BAPTA/AM. Conclusion: These results suggest that the increased expression of VEGF by hypoxia is mediated through the calcium and c-jun signalling pathway in the Hep3B human hepatoma cell lines.

온라인 쇼핑몰의 상품추천 시스템의 설계 및 실험 : 상품의 최신성을 고려한 사례기반추론 접근

배정연,김민용,권오병 경희대학교 국제경영연구소 2006 국제경영연구 Vol.12 No.1

신경회로망 제어기를 이용한 PID 파라미터 추정에 관한 연구

權重東,裵銀敬,金恩基,全基英,李承桓,吳鳳煥,李勳九,金容珠,韓慶熙 明知大學校 産業技術硏究所 2006 産業技術硏究所論文集 Vol.25 No.-

In this paper, supposed to solve these problem to PID parameters controller algorithm using ANN. In the proposed algorithm, the parameters of the controller were adjusted to reduce by on-line system the error of the speed of IM. In this process, EBPA NN was constituted to an output error value of an IM and conspired an input and output. The performance of the self-tuning controller is compared with that of the PH) controller tuned by conventional method (Ziehler-Nichols). The effectiveness of the proposed control method is verified thought the Matlab Simulink and experimental results.

Helicobacter pyloir 양성 소화성 궤양에서 lansoprazole 포함 삼제요법의 제균율 및 제균판정에 있어서 요소호기검사의 유용성

정혜경,곽재진,유민아,배기선,권정미,이종수,김도영,문일환 대한감염학회 2003 감염과 화학요법 Vol.35 No.3

목적 : 본 연구는 Helicobacter pylori (이하 H. polyri) 양성인 소화성 궤양 환자에서 lansoprazole 포함 삼제요법의 제균율을 알아보고, 제균 치료 후 제균 판정에 있어서 요소 호기 검사(Urea breath test, 이하 UBT) 및 신속요소분해(rapid urease test, 이하 RUT test)와의 일치율에 대하여 알아보고자 하였다. 방법 : 상부위장관내시경 검사에서 H. polyri 양성인 소화성 궤양환자에서 lansoprazole 60㎎+amoxicillin 2g+clarithromycin 1g의 약제를 2회 분복하여 1주간 복용하는 삼제요법을 실시하였다. 최소 4주후 추적 상부위장관내시경을 실시하였고, 전정부와 체부에서 각각 RUT를 실시하였으며 UBT(5분, 20분)를 시행하였다. 결과 : 대상환자는 총 46명으로 남자 34명(48±13세), 여자 12명(53±14세)이었다. LAC 삼제요법의 제균율은 40/46명(87.0%)이었고, 궤양의 치유율도 42/46명(91.3%)이었다. RUT와 20분 UBT 결과가 모두 음성이었던 경우는 41예, 모두 양성이었던 경우는 4예로 RUT와 UBT는 97.8% (45/46)의 일치율을 보였고, 1예는 UBT는 음성이었으나 체부에서 시행한 RUT가 양성이었다. 5분 UBT 검사가 양성이었던 예는 14/34 (41.2%) 이었고, 이 14예 중 12예(85.7%)는 20분 UBT 검사 음성, RUT 음성이었다. 결론 : Lansoprazole과 amoxicillin, clarithromycin 1주일 병합요법은 H. polyri 양성인 소화성 궤양 환자에서 87.0%의 제균율을 나타내어 우수한 효과를 보였고, 요소호기검사는 제균 치료 후 제균 판정에 유용한 비침습적인 방법임을 확인할 수 있었다. Background : There are only a few studies on Helicobacter pylori (H. pylori) for its eradication rates of lansoprazole-based triple therapy in Korea, and the results are controversial. Therefore, we undertook to investigate the eradication rate of lansoprazole-based triple therapy, and compare the concordance rate of urea breath test (UBT) and rapid urease test (RUT) in evaluating H. pylori eradication. Methods : Patients with acute peptic ulcer who were H. pylori-positive were recruited by prospective, consecutive manner. They received lansoprazole 30 ㎎ b.d., amoxicillin 1 g b.d. and clarithromycin 500 ㎎ b.d. for 1 week. Upper endoscopy was performed after 4 weeks to check for ulcer healing, and UBT and RUT were performed to evaluate H. pylori eradication status. Results : A total of 46 patients were recruited, and they were all compliant. H. pylori eradication rate was 87.0% (40/46) and ulcer healing rate was 91.3% (42/46). Forty one patients showed negative in both UBT and RUT, and 4 patients revealed positive in both tests, therefore, the concordance rate of UBT and RUT was 97.8% (45/46). Conclusion : Our study showed that 1-week lansoprazole-based triple therapy was effective in H. pylori eradication and ulcer healing. UBT can be an effective, noninvasive method for evaluating H. pylori status after H. pylori eradication.

경사판 板 앵커의 引拔抵抗 特性 (Ⅲ)

裵鐘淳,權正烈,金永仁 慶尙大學校生産技術硏究所 1998 生産技術硏究所論文集 Vol.14 No.-

In a recent industry development, the area and the length of the inclined plane are have been increased. It is needed to make use of mountain and inclination area as the site of structures because the use rate of these areas is enlarged by the large constructions. Therefore, in this study, some model experiments were performed to check the characteristics of the uplift capacity of inclined plate anchors which were embedded in the model of sloped air - dried sandy ground. The results of the uplift experiment are as follows : 1. The failure occurring in the shallow plate anchor which was embedded in sloped ground was local shear failure. The Peak point of displacement curve increased as the embedment ratio increased. 2. The ultimate uplift capacity was increased as the inclination angle and the embedment ratio of an anchor increased. It was much more influenced by the embedment ratio than by the inclination angle. 3. It was showed that the increasing ratio (K) of the ultimate uplift capacity was about 0.11 according to the inclination angle and embedment ratio of an anchor. 4. It was showed that the increasing ratio of the ultimate uplift capacity was changed linearly according to the inclination angle and embedment ratio of an anchor. 5. It was showed that the ultimate uplift capacity of an anchor was much more influenced the small of embedment ratio more than large one.

상악골과 비사골동에 이환된 백악질 골화성 섬유종(cemento-ssifying fibroma)의 치험례

권대현,김신유,남정순,구명숙,이봉서,권대근,김종배 大韓顎顔面成形再建外科學會 2001 Maxillofacial Plastic Reconstructive Surgery Vol.23 No.6

The cemento-ossifying fibroma is a benign fibro-osseous tumor that may behave in an aggressive pattern. Although found predominantly in the mandible, most of these unusual tumors may arise in the maxilla and paranasal sinuses. Especially these lesion in the maxilla and sinuses behave more aggressively and are more prone to recur compared to mandibular counterparts. Therefore, more radical approach may be recommended than expectant observation or curettage in the initial management of this neoplasm. This is a case report of cemento-ossifying fibroma extended to maxillary sinus and naso-ethmoidal area treated by wide surgical excision after repeated conservative treatments.

간암세포에서 저산소증에 의해 유도되는 VEGF의 발현기작에 대한 연구

권유욱,배수경,김정애,김규원,박병채 부산대학교 유전공학연구소 1997 분자생물학 연구보 Vol.13 No.-

Purpose: Hepatocellular carcinoma(HCC),a typical hypervasculized tumor is very sensitive to hypoxia and vascular endothelial growth factor(VEGF) has previously been identified to be up-regulated in response to hypoxia in several cell types. However, the molecular mechanisma by which hypoxia is sensed by the cells remain enigmatic. To investigate whether calcium and AP-1 are involved in hypoxia-sensing mechanism, we performed following eaperiments. Materials and Methods: Hep3B cells were grown in hypoxia condition. To assess cell viability, MTT assay was performed. To investigate the effect of calcium and AP-1,northern blot analysis was performed after treatment with BAPTA/AM. Results: The expression of VEGF was significantly up-regulated by hypoxia in Hep3B, hepatocellular carcinoma cell line. The increased expression of VEGF induced by hypoxia was blocked by the addition of BAPTA/AM, a cytosolic calcium chelator to the media. In addition, we found that the expression of c-jun protooncogene was also-regulated by hypoxia. Hypoxia increase of c-jun expression was also normalized by the treatment with BAPTA/AM. Conclusion: These results suggest that the increased expression of VEGF by hypoxia is mediated through the calcium and c-jun signalling pathway in the Hep3B human hepatoma cell lines.

觀光을 通한 地域活性化에 關한 硏究 : 日本의 內發的 地域活性化의 事例를 中心으로

田元培,權晶澤 大邱大學校 社會科學硏究所 1999 社會科學硏究 Vol.6 No.1

地域의 觀光開發 事業이 活性化되고 관광개발이 地域發展에 미치는 效果를 極大化 하기 위해서는 관광개발에 대한 發想의 轉換이 절실히 요구된다. 換言하여 금후 觀光의 觀光政策은 地方化時代의 定着과 觀光産業의 環境變化 등을 고려할 때 中央政府 차원에 의한 위로부터의 관광개발이 아니라 地域에 基盤을 두고 地域社會와의 連繫 속에서 이루어지는 地域觀光, 즉 地域性을 확보하는 방향으로 槪念轉換이 이루어져야한다. 이를 위해 地域文化 및 主體性의 再發見, 地域特性의 觀光資源化를 적극적으로 추진해야하며 觀光關聯事業에 內發的인 住民의 參與를 誘導하기 위한 方案을 摸索해야 한다. 內發的인 地域活性化는 外部에 대해 地域이미지의 提高와 地域의 自玲心과 愛鄕心을 鼓吹시키고, 나아가 觀光客의 지역에 대한 訪問動機를 자극시켜 방문을 유도하고, 窮極的으로는 地域住民의 삶의 質 向上에 기여한다. 그러나 地方自治制의 역사가 일천하고 觀光의 地域活性化에 대한 效果가 經濟的 效用에 지나치게 중점을 둔 나머지, 관광을 통한 지역의 意識啓發과 文化生活空間을 제공하며 地域住民의 福利增進이라는 面에서는 소홀하게 취급되어왔던 게 사실이다. 지역활성화를 위한 전통적인 전략을 기본적으로 外來型 開發, 즉 外部의 支援에 의한 대규모 개발 사업을 통한 地域開發의 추구였다. 이와 같은 전략 하에서는 國家 政府의 역할이 가장 중시된다. 그러나 최근 世界化, 情報化로 國境, 距離의 개념이 약화되고 경제성장요소의 移動이 보다 다이나믹해 감에 따라 地方化를 더욱 촉진 시키게되고 이러한 환경 하에서 中央政府 主導方式의 地域開發은 그 실효성을 더욱 저하시킬 수밖에 없는 것으로 평가된다. 따라서 전통적 戰略의 代案으로 주목받게 된 이론이 곧 內發的開發이다. 內發的開發은 地域內部의 모든 자원 - 자연적, 인적, 기술적, 문화적, 조직 및 제도적 자 원-을 活用, 이들간의 相互作用을 活性化시키고 統合함으로써 地域力量(regional capacity) 을 極大化시키는 戰略이다. 여기에서 지역의 인적, 조직 및 제도적 자원은 지역개발의 主 體가 되는 資源이고 자연적, 기술적, 문화적 자원은 지역개발의 客體的 資源이 된다.