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컨텍스트 기반 맞춤형 웹 서비스 제작을 위한 시뮬레이션 기반 방법론
장희정,김주원,최성운,이강선,Chang, Hee-Jung,Kim, Ju-Won,Choi, Sung-Woon,Lee, Kang-Sun 한국시뮬레이션학회 2006 한국시뮬레이션학회 논문지 Vol.15 No.4
퍼베이시브 컴퓨팅(pervasive computing) 기술이 현실화됨에 따라, 사용자에게 언제 어디서나 맞춤화된 서비스를 제공하기 위한 연구가 확대되고 있다. 기존 연구에서는 주로 단일 서비스가 센서 정보를 처리하는 제한된 방향으로 맞춤화된 서비스를 제공하고 있어, 사용자의 다양한 요구에 적응적인 서비스를 제공하는데 한계가 있다. 본 연구에서는 이와 같은 문제점을 해결하기 위해 시뮬레이션 기반 상황 인식 웹 서비스(CAS: Context-Aware Web services) 개발 방법론을 제안한다. 제안된 방법론은 사용자 상황 정보(예. 위치), 웹서비스 상황 정보(예. 반응시간), 사용 기기의 상태(예. 가용성), 환경 정보(예. 센서 데이터) 등을 시뮬레이션을 통해 종합적으로 고려하여 사용자 환경에 적응적인(adaptable) 서비스를 제공하도록 한다. With the emergence of pervasive computing, personalization becomes an important issue to provide with users customized services, anywhere and anytime in their specific environment. Many researches have shown the possibilities of personalization by acquiring and processing sensor information around users. However, personalization remains still at its infancy, since most researches have failed to consider various contexts comprehensively besides sensor data, and just developed tailored services for a specific application domain. In this work, we propose a simulation-based CAS (context Aware Web Services) development methodology. Our methodology considers various contexts on users (eg. current location), web services (eg. response time), devices (eg. availability) and environment (eg. sensor data) all together by simulating them on the fly for personalized and adaptable services.
sPAC(Web Service Performance Analysis Center): 성능 중심의 웹 서비스 조합 도구
장희정,송형기,이강선,Chang, Hee-Jung,Song, Hyung-Ki,Lee, Kang-Sun 한국시뮬레이션학회 2005 한국시뮬레이션학회 논문지 Vol.14 No.3
Web services and their composition (web processes) are promising technologies to efficiently integrate disparate software components over various types of systems. As many web services are nowadays available on Internet, quality of services (QoS) and performance/cost become increasingly important to differentiating between similar service providers. In this work, we introduce sPAC (Web Services Performance Analysis Centre) and show how customers can benefit from sPAC to consider performance in composing and commercializing web services. sPAC 1) helps users to graphically describe the workflow of web services, 2) invokes web services to test out performance for light load conditions, 3) automatically converts the web services and the flow between them into a simulation model, 4) conducts extensive simulations for heavy load conditions and various usage patterns, and 5) reports analysis results and estimation data for the web services.
학령기 아동의 내러티브 쓰기에 나타난 거시 및 미시구조 분석
장희정(Hee Jung Chang),김화수(Wha Soo Kim) 한국언어치료학회 2016 言語治療硏究 Vol.25 No.4
Purpose: Writing problems may constantly cause learning difficulties until late school age. This study examined typically-developing school-age children’s narrative writing development in macrostructure and microstructure. Methods: A total of 120 students were selected, 40 each from the second, fourth, and sixth grade. They each wrote personal and fictional narratives. The writing samples were analyzed for macrostructure and microstructure. The macrostructure of each narrative was assessed by using the narrative scoring scheme (NSS). The microstructure of each narrative was analyzed by being divided into productivity, syntactic complexity, lexical diversity, and spelling accuracy. Results: In personal narratives, most characteristics in macrostructure increased in students in the higher graders. Productivity and lexical diversity in microstructure were significantly higher in the sixth grade. Syntactic complexity and spelling accuracy were significantly higher in the fourth and sixth grades than the second grade. In fictional narratives, the results of macrostructure analysis were the same as those of personal narratives, but in fictional, differences in mental states and cohesion were noticeable. In microstructure analysis, the results of fictional narratives were the same as those of personal narratives, but in fictional, there was a significant difference in spelling accuracy between the second and fourth grades. Partial correlation analysis between standards of macrostructure and microstructure found that NSS had positive correlations with microstructure, with the exception of spelling accuracy. Between microstructure items, the number of C-units showed a negative correlation with MLC-w, whereas other items had positive correlations. Such trends appeared in both personal and fictional narratives. Conclusions: This study discovered that most indicators increased as students were in higher grades. Even though the indicators that had differences were similar in both personal and fictional narratives, the difference between all grades were noticeable in fictional narratives.
소 음경후인근의 Nitric oxide(NO) 매개성 이완
양일석,장희정,강동묵,이장헌,Yang, Il-suk,Chang, Hee-jung,Kang, Tong-mook,Lee, Jang-hern 대한수의학회 1996 大韓獸醫學會誌 Vol.36 No.3
This study was designed to examine the mechanism of penile erection in adult bull by analyzing the responses of bovine proximal retractor penile muscle strips(BRP) to electtical field stimulation(EFS), exogenous nitric oxide(NO), NO synthesis precursor(L-arginine), NO synthase inhibitors(L-NAME, L-NMMA), guanylate cyclase inhibitor(methylene blue) and nonspecific potassium channel blocker(tetraethylammonium, TEA) treatments. Isometric tension of BRP was measured using physiograph. Results were summarized as follows: 1. EFS of nonadrenergic noncholinrgic(NANC) nerve in BRP produced frequency-dependent inhibitory responses to the contraction induced by co-treatment of epinephrine, guanethidine and atropine. The inhibitory responses to EFS were blocked by tetrodotoxin(TTX, $1{\mu}M$). 2. Treatment of L-NAME ($10,\;20{\mu}M$) inhibited the relaxation to EFS whereas L-NMMA ($100{\mu}M$) had no effect. 3. Treatment of NO($20,\;40{\mu}M$; as an acidified solution of $NaNO_2$) induced concentration-dependent relaxation whereas preincubation of TTX($1{\mu}M$) and L-NAME($20{\mu}M$) had no effect on the relaxation response. 4. L-arginine treatment(10mM) blocked the inhibitory effect of L-NAME($20{\mu}M$). 5. Pretreatment of methylene blue($40{\mu}M$) reduced the NANC-induced relaxation of BRP. 6. Tetraethylammonium(TEA, 80mM) reduced NANC relaxation. These results suggest that NO may act as a NANC neurotransmitter in BRP and the effects might be mediated by cGMP and potassium channel.
김태섭,장희정,이재민,이강선,Kim, Tae-Sup,Chang, Hee-Jung,Lee, Jae-Min,Lee, Kang-Sun 한국시뮬레이션학회 2010 한국시뮬레이션학회 논문지 Vol.19 No.2
Modeling and Simulation techniques are useful to construct executable battlefields and forces on computers, and have been utilized to analyze effectiveness of weapon systems in the computerized war environment. However, most weapon simulations so far have exhibited low reusability and extensibility, since they have been developed for specific simulation objectives with different structures and simulation engines. In this paper, we identify requirements for defense modeling and simulation activities and propose a simulation engine to support the identified requirements. We define the software architecture of the proposed engine, in a way to efficiently provide usability, component-based reusability, interoperability, and reuse-based development.
30 ∼ 40대 한국여성이 선호하는 피부색에 대한 연구
강내규 ( Nae Gyu Kang ),곽택종 ( Taek Jong Kwak ),김정아 ( Jung A Kim ),김태훈 ( Tae Hoon Kim ),문태기 ( Tae Kee Moon ),박선규 ( Sun Gyoo Park ),송다영 ( Da Young Song ),이수진 ( Su Jin Lee ),장민열 ( Min Youl Chang ),장희정 ( Hee 대한화장품학회 2014 대한화장품학회지 Vol.40 No.4
피부는 인체의 외부를 덮고 있는 기관일 뿐 아니라, 체온을 조절하고, 감각기능을 수행하며, 약물을 투입하는 경로가 되기도 하고 내부 기관의 이상을 표현하는 기관이 되기도 한다. 이러한 이유로 인해, 사람들은 타인의 얼굴 피부의 상태를 보고 건강의 이상 징후를 감지하거나, “안색이 좋다”, “생기가 있다” 등으로 신체의 컨디션을 표현해왔다. 환경과 노화정도에 따라서 피부색, 피부결, 수분, 탄력 등이 달라지는 것도 알려진 사실이다. 특히, 피부색은 아름다움, 매력도와 같은 주관적인 인상을 판단하는데 영향을 미치는 인자로 작용하는데, 화장품이나 피부시술을 통해 피부색을 개선하고자 하는 소비자를 통해서 그 수요를 짐작할 수 있다. 하지만 피부색이 여러 색의 구성임에도 불구하고, 대부분의 화장품이 하얀 피부로 개선해주는 것에 초점을 맞추고 있으며 여성들이 선호하는 피부색에 대한 연구가 아직까지는 미흡한 실정이다. 본 연구에서는 30 ∼ 40대의 한국여성을 대상으로 같은 피부 밝기에서 붉은 정도와 푸른 정도가 달리 주어진 선호도 조사를 통해 긍정적으로 인식하는 피부색의 상태를 발견하였다. 한국여성은 실제 평균 피부색에 비해 붉은색과 푸른색이 높은 피부를 선호하는 것으로 나타났으며, 피부에 대한 표현을 달리하였을 때에도 경향은 유사하였다. 본 연구 결과는 새로운 소비자의 요구를 만족시키는 제품 개발에 활용될 수 있을 것이라고 생각한다. The skin is an organ that covers the outside of the human body. And it regulates body temperature, performs sensory function, deliveries the drug, and represents the abnormality of the internal organs. For these reasons, people have been expressing the condition of the body based on the state of the skin of the face to detect sign of health, “you look well”, “face with vitality”. Depending on the degree of aging and the environment, it is a fact that skin color, skin texture, moisture and firmness could be different. In particular, the color of the skin acts as a factor that affects to determine the subjective impression such as beauty and charm. We could expect consumer’s demand through the market of whitening cosmetics and skin treatment. However, existing most of the cosmetics focus on improving whiteness. The number of studies that focused on skin color is not enough. In this study, we found out the skin color condition by carrying out surveys of 100 women between 30s and 40s. Our study would be very useful to develop new cosmetic products and to satisfy customer’s needs.