• Annual Conference of KIPS
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• 2011.11a
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• pp.1243-1247
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• 2011

센서 네트워크는 많은 수의 센서들로 구성되며 물질세계와 상호작용하여 실시간 감시를 할 수 있는 큰 규모의 네트워크이다. 현실 세계의 물리적 변화를 지속적으로 감시하기 위하여 센서 네트워크에 속해 있는 각 센서들은 주기적으로 측정값을 읽어서 기지국(base station)에 전달하는 기능을 수행한다. 이러한 경우, 각 센서들의 지속적인 통신에 따른 에너지 낭비가 발생하여 센서 네트워크 전체의 수명을 단축시키게 된다. 따라서 데이터 모니터링에 있어서 예측을 통한 근사 데이터 수집을 통해 센서 네트워크의 수명을 연장하고자 하는 연구들이 진행되고 있다. 그러나 현재의 예측을 통한 근사 데이터 수집은 측정값의 변화가 클수록 예측 모델의 갱신이 잦다. 따라서 본 논문에서는 지연 갱신을 이용한 효율적인 예측 모델 갱신 기법을 제안한다. 제안된 기법에서는 예측이 실패하였을 경우 즉시 예측 모델을 갱신하는 대신 문제가 되는 구간의 측정값들을 지연, 근사화하여 전송함으로써 예측 모델의 잦은 갱신을 방지할 수 있다.

• Nuclear Engineering and Technology
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• v.54 no.12
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• pp.4759-4775
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• 2022

The RVACS is a versatile and robust safety system driven by two natural circulations: in-vessel coolant and ex-vessel air. To observe interaction between the two natural circulations, SINCRO-IT facility was designed with two different similarity laws simultaneously. Bo' based similarity law was employed for the in-vessel, while Ishii's similarity law for the ex-vessel excluding the radiation. Compared to the prototype, the sodium and air system, SINCRO-IT was designed with Wood's metal and air, having 1:4 of the length reduction, and 1.68:1 of the time scale ratio. For the steady state, RV temperature limit was violated at 0.8% of the decay heat, while the sodium boiling was predicted at 1.3%. It showed good accordance with the system code, TRACE. For an arbitrary re-criticality scenario with RVACS solitary operation, sodium boiling was predicted at 25,100 s after power increase from 1.0 to 2.0%, while the system code showed 30,300. Maximum temperature discrepancy between the experiments and system code was 4.2%. The design and methodology were validated by the system code TRACE in terms of the convection, and simultaneously, the system code was validated against the simulating experiments SINCRO-IT. The validated RVACS model could be imported to further accident analysis.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2022.10a
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• pp.404-406
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• 2022

In this study, a data science class plan was designed for the high school credit system in general high schools. Since it is difficult to secure class hours in elementary and middle schools or general high schools, learners cannot freely take new subjects such as data science. Therefore, a lesson plan was designed based on the ADDIE model for 15 students who applied for data science at general high schools in A city. Through this study, it was possible to design the data science class according to the learning method.

• Korean Journal of Head & Neck Oncology
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• v.39 no.2
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• pp.41-44
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• 2023

Follicular dendritic cell sarcoma (FDCS) is rare lymphoid sarcoma occurs anywhere in body, mostly in lymph nodes. Sixty-two-year-old man presented left submandibular gland region mass for 5 months. Mass excision with submandibular gland resection was performed. Histopathology showed proliferation of spindle and ovoid cells with storiform arrangement which were positive for CD21, CD23, Vimentin, Ki-67, suggested FDCS in submandibular gland region lymph node. Tumor size was 3cm with no involvement of resection margin, nor cellular atypia and necrosis, so regular follow up was performed. After 4 years, new enhancing mass in left submandibular area was found. Wide excision of mass with neck dissection on left level I-III was performed. Histopathology confirmed recurrence of FDCS. The patient underwent radiation therapy from left mandible to hyoid area. After 2 years, new nodule was found in left lung upper lobe, and wedge resection confirmed metastasis of FDCS. The patient is on adjuvant chemotherapy.

• International Journal of Advanced Culture Technology
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• v.12 no.1
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• pp.276-280
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• 2024

Recently, many policies and fairs have been made in relation to start-ups. In addition, various start-up education for prospective start-ups is being conducted in various ways. Therefore, these days, the number of prospective start-ups who receive such information and start-up education is increasing. Nevertheless, more and more start-ups are still unsuccessful and close their businesses within months or years. In particular, start-ups who continue to maintain their start-ups also see the unfortunate reality of start-ups that find other jobs in various support systems and related policies and relationships that they cannot quit even if they want to. In this study, based on previous studies, factors for satisfaction with entrepreneurship education will be set and a questionnaire will be conducted for prospective entrepreneurs who have completed education at a startup education center in Seoul. The survey results are intended to verify their reliability and validity through empirical analysis. The SPSS statistical package will be used for analysis, and a total of 200 copies of the questionnaire will be distributed and collected. In this study, it was confirmed that the higher the satisfaction with entrepreneurship education, the better the successful entrepreneurship. In addition, I think that further developing various policies or detailed curriculums for entrepreneurship education will be of great help to prospective entrepreneurs taking entrepreneurship education.

• Journal of Physiology & Pathology in Korean Medicine
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• v.28 no.5
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• pp.494-498
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• 2014

It is well known that Desomodii Herba (DH) has an effect to eliminate dampness, relieve jaundice and to clear away toxic material, relieve swelling in Korean Medicine. However, the effect of DH on breast cancer invasion is unknown. In this study, we investigated the inhibitory effect of DH extracts (DHE) on 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced matrix metalloproteinase-9 (MMP-9) expression and cell invasion, as well as the molecular mechanisms involved in MCF-7, human breast cancer cells. DHE inhibits TPA-induced MMP-9 protein and mRNA expressions in a dose-dependent fashion. DHE also inhibited the TPA-induced transcriptional activation of nuclear factor-kappa B (NF-${\kappa}B$). These results indicate that DHE-mediated inhibition of TPA-induced MMP-9 expression and cell invasion involves the suppression of NF-${\kappa}B$ pathway in MCF-7 cells.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• v.31 no.4
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• pp.185-192
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• 2020

Objectives: Our study aimed to analyze the demographic and clinical characteristics of children and adolescents during their first visit to psychiatric outpatient departments for the management of suicidal ideation and behavior, and to compare the changes before and in 2012 or later. Methods: This multicenter study was conducted at five university hospitals in a metropolitan area in South Korea. Medical records of patients aged 6-18 years were retrospectively reviewed from January 2009 to December 2016. Patients were analyzed by classifying them into suicidal and non-suicidal groups based on their visit to the hospital for management of suicidal ideation or suicide attempt and other mental problems, respectively. Results: There were differences in the year of visit, diagnosis, education level, and referral sources between patients in the suicidal and non-suicidal groups. Multiple regression analysis was conducted based on the sex, education level, referral by school, and diagnosis of depression in patients in the suicidal group, which revealed significant association. Conclusion: Suicide-related problems were significantly associated with the sex, education level, referral by school, and a diagnosis of depression in the patients. A well-connected referral system would be necessary for professional mental health management of high-risk children and adolescents.

• Molecular & Cellular Toxicology
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• v.1 no.3
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• pp.164-171
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• 2005

Toxicological studies have an object of detecting adverse effects of a chemical on an organism based on observed toxicity marker (i.e., serum biochemical markers and chemical-specific gene expression) or phenotypic outcome. To date, most toxicogenomic studies concentrated on hepatic toxicity. cDNA microarray analysis enable discrimination of the responses in animals exposed to different classes of hepatotoxicants. In an effort to further characterize the mechanisms of 2, 3, 7, 8,-Tetrachlorodibenzo-p-dioxin (TCDD or dioxin)-mediated toxicity, comprehensive temporal-responsive microarray analyses were performed on hepatic tissue from Sprague-Dawley rats treated with TCDD. Hepatic gene expression profiles were monitored using custom DNA chip containing 490 cDNA clones related with toxicology. Gene expression analysis identified 26 features which exhibited a significant change. In this study, we observed that the genes related with oxidative stress in rats exposed to Dioxin, such as CYPIIA3 and glutathione S-transferase, were up-regulated at 24hr after exposure. In this study, we carried out to discover novel evidence for previously unknown gene expression patterns related to mechanism of hepatic toxicity in rats exposed to dioxin, and to elucidate the effects of dioxin on the gene expression after exposure to dioxin.

• Journal of Physiology & Pathology in Korean Medicine
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• v.18 no.6
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• pp.1661-1665
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• 2004

Herba Patriniae(HP) has been known to exert anti-tumoral activity in Korea. However, its molecular mechanism, of action is not understood. In this study, we found that HP induced apoptosis in androgen-dependent prostate cancer DU145 cells as evidenced by DNA fragmentation and chromatine condensation in hoechst dye staining. Our data demonstrated that HP-induced apoptotic cell death was accompanied by activation of caspase-3 and cleavages of its substrates, poly(ADP-ribose) polymerase(PARP) in a time- and concentration-dependent manner. Taken together, these results suggest that HP induces the activation of caspase-3, degradation of PARP, and eventually leads to apoptotic cell death.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• v.17 no.4
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• pp.223-231
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• 2014

Purpose: With previous methods based on only age and location, there are many difficulties in identifying the etiology of acute abdominal pain in children. We sought to develop a new systematic classification of acute abdominal pain and to give some helps to physicians encountering difficulties in diagnoses. Methods: From March 2005 to May 2010, clinical data were collected retrospectively from 442 children hospitalized due to acute abdominal pain with no apparent underlying disease. According to the final diagnoses, diseases that caused acute abdominal pain were classified into nine groups. Results: The nine groups were group I "catastrophic surgical abdomen" (7 patients, 1.6%), group II "acute appendicitis and mesenteric lymphadenitis" (56 patients, 12.7%), group III "intestinal obstruction" (57 patients, 12.9%), group IV "viral and bacterial acute gastroenteritis" (90 patients, 20.4%), group V "peptic ulcer and gastroduodenitis" (66 patients, 14.9%), group VI "hepatobiliary and pancreatic disease" (14 patients, 3.2%), group VII "febrile viral illness and extraintestinal infection" (69 patients, 15.6%), group VIII "functional gastrointestinal disorder (acute manifestation)" (20 patients, 4.5%), and group IX "unclassified acute abdominal pain" (63 patients, 14.3%). Four patients were enrolled in two disease groups each. Conclusion: Patients were distributed unevenly across the nine groups of acute abdominal pain. In particular, the "unclassified abdominal pain" only group was not uncommon. Considering a systemic classification for acute abdominal pain may be helpful in the diagnostic approach in children.