터널 배수체계 효율성 증대방안 연구

김지훈,김지엽,정국영,박상일,Kim, Ji-Hun,Kim, Ji-Yeop,Jeong, Guk-Yeong,Park, Sang-Il 한국터널지하공간학회 2011 자연, 터널 그리고 지하공간 Vol.13 No.5

하라다병 환자에서 섬모체맥락막 삼출로 인해 발생한 양안의 급성 근시와 전방각 폐쇄 1예

김지훈,임재석,이지웅,이지은,엄부섭,Ji Hun Kim,MD,Jae Seok Lim,MD,Ji Woong Lee,MD,Ji Eun Lee,MD,PhD,Boo Sup Oum,MD,PhD 대한안과학회 2012 대한안과학회지 Vol.53 No.8

Purpose: To report a case of bilateral acute myopia and angle-closure with ciliochoroidal detachment in Vogt-Koyanagi-Harada (VKH) syndrome. Case summary: A 43-year-old Korean woman diagnosed with VKH syndrome underwent intravenous methylprednisolone steroid pulse treatment. After oral medication was given for 2 days, the anterior chambers became shallow in both eyes. Intraocular pressure (IOP) increased to 25 mm Hg in the right eye and 23 mm Hg in the left eye. Subretinal fluid increased and visual acuity decreased with myopic shift in both eyes. IOP did not decrease despite maximum tolerated medical therapy. Ultrasound biomicroscopy (UBM) revealed that ciliochoroidal effusion caused forward displacement of the lens-iris diaphragm, which resulted in anterior chamber shallowing and angle closure in both eyes. The patient was treated with cycloplegic eyedrops and intravenous steroid pulse therapy. After intravenous steroid pulse treatment was given for 2 days, the anterior chambers became deep in both eyes. IOP reduced to 13 mm Hg and 14 mm Hg in the right and left eye respectively. Visual acuity increased with normalization of myopic shift. UBM revealed that the ciliochoroidal effusion had resolved in both eyes. J Korean Ophthalmol Soc 2012;53(8):1194-1199

Bio-Oss 골이식이 치아맹출에 미치는 영향에 관한 동물실험 연구

김지훈,장채리,최병호,Kim, Ji-Hun,Chang, Chae-Ri,Choi, Byung-Ho 대한구강악안면외과학회 2010 대한구강악안면외과학회지 Vol.36 No.6

Introduction: There are few reports on tooth eruption through Bio-Oss grafts. To our knowledge, there are no reports on whether teeth can erupt normally through the grafts. The aim of this study was to examine the effect of Bio-Oss grafts on tooth eruption in a canine model. Materials and Methods: In five 10-week-old dogs, the deciduous third mandibular molars in one jaw quadrant of each animal were extracted and the fresh extraction sockets were then filled with Bio-Oss particles (experimental side). No such treatments were performed on the contralateral side (control side). A clinical and radiological evaluation was carried out every other week to evaluate the eruption level of the permanent third mandibular premolars and compare the eruption levels between the two sides. Results: At week 4 after the experiment, the permanent third premolars began to erupt on both sides. At week 12, the crown of the permanent third premolar emerged from the gingiva on both sides. At week 20, the permanent third premolars on both sides erupted enough to occlude the opposing teeth. No significant differences were found between the control and experimental sides in terms of the eruption speed of the permanent third molars. Conclusion: These findings demonstrate that the grafting of Bio-Oss particles into the alveolar bone defects does not affect tooth eruption.

디스크립터의 의미기술로서 정의를 통한 애매성 제거

김지훈,Kim, Ji-Hun 한국과학기술정보연구원 과학기술정보센터 2005 Journal of Information Science Theory and Practice Vol.36 No.3

지금까지 대부분의 시소러스에서 용어의 의미는 주로 관계나 범위주기를 통해 간접적으로 제시되어 왔다. 그러나 시소러스가 양적으로 팽창해짐에 따라, 이들을 통해 용어의 의미를 명확히 파악하는 것이 점차 어렵게 되었다. 이에 일부 시소러스는 사전의 정의를 함께 수록하기도 하였지만, 그 내용이나 형식이 만족스럽지 않은 것으로 인식되어 왔다. 이 연구는 용어의 의미를 제공하는 정의의 필요성을 토대로 표준화된 정의를 시소러스에 통합해 봄으로써, 시소러스가 더욱 발전할 수 있는 가능성을 제시하였다. Until now, the meaning of terms in most of thesauri has been indirectly presented through relationships and scope notes. However, as thesaurus has been expanded quantitatively, it has become difficult to understand meaning of terms clearly using those relationships and scope notes. Though some thesauri take the form of 'thesaurus dictionary' in order to present the meaning of descriptors, the contents and forms of provided definitions are not satisfying. As standardized definitions of terms integrate into thesaurus on the basis of necessity of definitions providing meaning of terms, this study has shown a possibility for further development of thesaurus.

딥러닝 기반 무역 수출 가격 예측 모델

김지훈,이지항,Kim, Ji Hun,Lee, Jee Hang 한국정보처리학회 2022 정보처리학회논문지. 소프트웨어 및 데이터 공학 Vol.11 No.10

Korea Trade-Investment Promotion Agency (KOTRA) annually publishes the trade data in South Korea under the guidance of the Ministry of Trade, Industry and Energy in South Korea. The trade data usually contains Gross domestic product (GDP), a custom tariff, business score, and the price of export items in previous and this year, with regards to the trading items and the countries. However, it is challenging to figure out the meaningful insight so as to predict the future price on trading items every year due to the significantly large amount of data accumulated over the several years under the limited human/computing resources. Within this context, this paper proposes a multi layer perception that can predict the future price of potential trading items in the next year by training large amounts of past year's data with a low computational and human cost. 산업통상자원부에서 제공하는 KOTRA 무역 데이터는 해당 품목과 해당 국가에 대하여 GDP, 관세율, 비즈니스 점수, 과/차년도 수출금액 등을 제공한다. 그러나 무역 수출품목은 수없이 많을뿐더러 그에 따른 대량의 데이터를 매년 수작업 기반 분석을 통해 유의미한 결과를 이끌어내는 것은 상당히 큰 시간과 비용을 요구한다. 따라서 이번 연구에선 대량의 데이터를 학습하여 단기간에 저비용으로 결과 예측이 가능한 다층 퍼셉트론 모델을 구현하고 성능을 평가하였다. 먼저 딥러닝 기반 무역 수출 가격 예측 모델을 일반적 다변량 회귀 모델과 비교하였을 때, 예측 오류와 학습 시간 측면에서 통계적으로 우수한 성능을 보였다. 수출 가격 데이터는 시계열 속성이 있을 것으로 예상하는 바, 은닉 노드들이 모두 연결된 다층 퍼셉트론과 순환 신경망을 이용하여 수출 가격 데이터를 예측하였다. 그 결과 새로운 데이터에 대해 수출 가격 예측을 위한 일반화 능력은 순환 신경망이 우수한 성능을 보였으나, 다층 퍼셉트론이 무역 수출 가격 예측에서 더 뛰어난 성능을 보였다. 추후 장기간 데이터를 확보한다면, 순환 신경망 혹은 트랜스포머 기반 딥러닝 모델을 이용하여 더 뛰어난 수출 가격 예측이 가능할 것으로 사료된다.

특발성 망막앞막에서 망막앞막 제거 시에 발생하는 망막점상출혈과 내경계막 손상

김지훈,박현준,이지은,엄부섭.Ji Hun Kim. MD. Hyun Jun Park. MD. Ji Eun Lee. MD. PhD.. Boo Sup Oum. MD. PhD. 대한안과학회 2012 대한안과학회지 Vol.53 No.6

Purpose: To evaluate the relationship between retinal dot hemorrhage that occurred during membrane peeling (MP) and the damage to the internal limiting membrane (ILM) at idiopathic epiretinal membrane (ERM). Methods: The authors of the present study retrospectively reviewed 50 eyes of 50 consecutive patients who underwent vitrectomy with MP for idiopathic ERM. For all the patients, the ILM was stained with indocyanine green following MP. ILM damage was evaluated using microscopy during the operation. Tissue was examined by light and electron microscopy. Whether or not retinal hemorrhage occurred during the MP and the location of the hemorrhage were also investigated. Results: During the MP for idiopathic ERM, ILM damage was observed in 43 (86%) of 50 eyes, and some defects of the ILM due to simultaneous removal with the ERM were observed in 37 (74%) of 50 eyes. Retinal dot hemorrhage occurred during the MP in 32 eyes (64%) and did not occur in 18 eyes (36%). In 32 eyes with retinal hemorrhage, ILM damage was observed in 30 eyes (94%). Large or small defects of the ILM due to simultaneous removal with the ERM were observed in 27 of 30 eyes, and ILM tear was observed in 3 eyes. The hemorrhage occurred in 2 eyes without gross ILM damage during the MP. Among 18 eyes without retinal hemorrhage, large or small defects of the ILM due to simultaneous removal with the ERM were observed in 10 eyes (56%). ILM tear was observed in 2 eyes, ILM detachment was observed in 1 eye, while ILM remained intact in 5 eyes (28%). The number of eyes where both ERM and ILM were peeled simultaneously was significantly higher in the cases with retinal hemorrhage (p = 0.047). Cases of hemorrhage in Gass grade 2 were statistically higher than that in Gass grade 1 (p = 0.015). OCT type of ERM did not have significant correlation with retinal hemorrhage or ILM damage during the MP. Conclusions: During the MP for idiopathic ERM, ILM damage was observed in 86% of patients, and some defects of the ILM due to simultaneous removal with ERM were observed in 74% of patients. It is highly suggestive that ILM is damaged at the hemorrhage site if retinal dot hemorrhage occurred during the MP for idiopathic ERM. J Korean Ophthalmol Soc 2012;53(6):786-791

용어정의와 관계추출을 통한 시소러스 확장에 관한 연구

김지훈,김태수,Kim, Ji-Hun,Kim, Tae-Soo 한국문헌정보학회 2006 한국문헌정보학회지 Vol.40 No.1

정보검색과정에서 용어의 일관성을 유지하기 위해, 시소러스에서 용어의 의미를 명확하게 제시하는 것이 필요하다. 이에 대부분 시소러스는 기본관계나 범위주기를 이용하여 용어의 의미를 제시하여 왔으나, 최근 내용과 형식에 있어서 표준화된 정의를 포함하는 시소러스가 제안되어 왔다. 이 연구는 표준화된 정의를 작성함과 동시에 그러한 과정에서 사용한 정의모델의 내용에서 관계를 추출하고, 이들 표준정의와 추출된 관계를 기존의 시소러스에 통합하거나 대체하여 확장된 시소러스를 구축해 봄으로써, 시소러스가 더욱 발전할 수 있는 가능성을 고찰하였다. To maintain consistency of terms in information retrieval process, it is necessary to present the meaning of terms definitely in thesaurus. Therefore, most of thesauri has presented meaning of terms through basic relationships or scope notes. But. thesaurus including standardized definitions in contents and form has been proposed lately. This study was performed to make standardized definitions and extract relationships in contents of defining models. Also, expanded thesaurus was constructed being integrated and replaced standardized definitions and extracted relationships into the existing thesaurus. As the result. this study has shown a possibility for further development of thesaurus.

회원작품 - 경상북도립 치매 요양병원

김지훈,김원갑,Kim, Ji-Hun,Kim, Won-Gap 대한건축사협회 1999 建築士 Vol.1999 No.6

돼지의 사료섭취량에 영향을 주는 요인들(1)

김지훈,Kim, Ji-Hun 대한양돈협회 1999 養豚 Vol.21 No.10

Al 합금의 응고 (1)

김지훈,예병준 ( Ji Hun Kim,Byung Joon Ye ) 한국주조공학회 1998 한국주조공학회지 Vol.18 No.3