• Korean Journal of Optics and Photonics
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• v.8 no.5
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• pp.431-437
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• 1997

A gradient-index (GRIN) substrate is proposed as a novel signal propagation medium of planar optics. The GRIN substrate provides planar-optics designers not only a 3-dimensional signal propagation space, but also an additional smart optical functioning component like as a diffraction-limited imaging lens. The novel and smart functioning of the GRIN substrate was confirmed by experiment on imaging of an input signal to multiple destinations.

• Korean Journal of Heritage: History & Science
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• v.42 no.2
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• pp.134-153
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• 2009

This study is to examine closely the frame structure of buildings in the royal palace of Josen dynasty, focused on inner buildings of Changgyeonggung(昌慶宮) which is built in 19th century, through considering the member size of main structure and analyzing the slope of a rafter. The plans of a size on main member are as follows ; firstly, a length of the perimeter column was accorded with Gunggwolji(宮闕誌) and the planning size of interior column was shown to a Chon(a Korean inch, 寸) unit. The slope of long common rafter that is formed between the perimeter and interior columns was grasped with limits of a definite value. This is that the perimeter column is trimmed to a Chon unit, as Yeongchunheon(迎春軒), In the roof frame of Korean traditional timber architecture, the slope of rafter, first of all, is to decide the slope of long common rafter and then to decide a height of ridge piece settled whole height of a building. And it is regulated with position and height of a post so as to set up middle rafter. Especially, the slope of long common rafter, it is not to be decide through scale of a building but through a length of the perimeter column and composition of bracket structure. And in case middle rafter, the process of its slope is to devide the central bay on the side of a building into equality, and then to adjust position and length of a post.

• Proceedings of the Korean Ceranic Society Conference
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• 2000.04a
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• pp.103.2-103.2
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• 2000

• Korean Journal of Environment and Ecology
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• v.12 no.4
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• pp.398-405
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• 1999

This study was carried out to investigate exercise load of visitors and physical condition of stairway in the trail of Keumsan located in Hallyo-Haesang National Park. Total trail length of Keumsan is 2,126m, and the number of step-trail section are 15, and the total length of step-trail section is 1,000.4m. Average gradient of step-trail was 20~40%. But the gradient and length were 45.7% and 268.5m in the section 11, and 58.4% and 188.6m in the section 12. The greatest gradient was 67.8% in the section 13. During the climbing in trail, heart rate were 104~184beats/min.. And in the step-trail section 11, 12, and 13, IHR, ELI, and %HRmax were 166.5%, 89.1%, 92.9%, and 167.4%, 89.6%, 93.2%, and 157.8%, 84.5%, 89.9%, respectively.

• Journal of Korean Society of Forest Science
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• v.85 no.3
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• pp.513-523
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• 1996

This study was a med at predicting running speed related to alignment factors of forest road, and recommending the improvement method of forest road construction using the running speed of vehicles. For these purposes, this study proceeds to select forest roads after reviewing the planning papers and maps, to measure the road alignment factors such as longitudinal gradient, width of roadway, radius of curve, length of curve, superelevation, and conditions of road surface on the subject forest road. It was found that the running speed of vehicle on forest road is mainly influenced by the conditions of road surface, radios of curve, compound gradient, length of curve, longitudinal gradient and so on. The average running speed of cargo truck showed lower value than that of the expected speed of 'Forest Road Construction Regulations and Rules', and the average running speed of loaded truck showed 70-85% of the speed of empty truck. According to the road conditions, the changes of running speed can be expressed mathematically in terms of the increment of radius of curve and longitudinal gradient. The results of the study on the running speed of vehicle subject to the alignment of forest roads make it possible for one to judge the quality of the existing and to be constructed forest roads, to select the structure of forest road to improve the running speed of vehicle on forest road.

• Journal of the Korean Association of Geographic Information Studies
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• v.5 no.3
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• pp.99-106
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• 2002

The application method of GIS for planning of forest road network can be save the efforts and cost by frequently change of forest road and evaluation the forest road route before construction. The purpose of this study is to suggest the proper method for planning an optimal forest road network in mountains forest using geographic information system(GIS) in the national forest of Mt. Kumsan at Namhae-gun, Gyungsangnam-do. In the forest road network planning by the minimum longitudinal gradient, The total length was 20.41km, and road density was 6.92m/ha. In the forest road network planning by mixed with the minimum longitudinal gradient and the maximization of investment effect, The total length was 21.15km, and road density was higher than that of the minimum longitudinal gradient as 7.17m/ha. The road length overlapped by cost path was more short than 3.52m/ha of the minimum longitudinal gradient as 1.73km. So, it appeared that forest road has an high effectiveness in yarding function. Therefore, it considered that the geographic information system could provide an effective and resonable solutions for planning of optimal forest road network.

• Journal of architectural history
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• v.29 no.6
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• pp.57-65
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• 2020

This study covered the Mulmae, architectural drawing recorded on Yeonggeon-uigwes and Sanleung-uigwes during the late Joseon Dynasty. In uigwes, the term 'Mulmae' was used as a mixture until the 17th century, but from the 18th century, the term 'Mulmae(勿乙每, 勿每, 水每)' was unified into 'Mulmae(水每)'. The paper of the Mulmae was made to be used during the construction period by using a thick oil paper called Yudun. Four Yudun were connected, and its size was 197.4×141cm, which was rather large. The Yingzaofashi(營造法式) of Song Dynasty describes how to draw a longitudinal section on a scale of 1/10. The scale of 1/10 was the maximum when comparing the size of the Mulmae with the buildings in uigwes. A sectional drawing of Gongpo in Geunjeongjeon was drawn on a scale of 1/10. There is a testimony that a senior carpenter drew a cross-section on a scale of 1/10. Therefore, it was determined that the scale of the longitudinal section drawn on the Mulmae paper was 1/10. The term 'the Mulmae' was used equally by carpenter active in Japanese colonial era. The scope of the painting was clarified from pillar to rafter. Uigwes records that the Mulmae was made for wood processing. Through this, it can be understood that the Mulmae painted the entire structure as a longitudinal section.

• Journal of Forest and Environmental Science
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• v.7 no.1
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• pp.35-41
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• 1990

This study was conducted to find out the suitable gradient and length of the slope from the landslide of banking slope and cutting slope caused by rainfall. The survey was carried out on forest road built in 1986. And the period of survey was from June, 1989 to August, 1989 after dividing the forest road into A and B. The survey plots consisted of the 12 banking slopes and 6 cutting slopes. The results obtained from the study were summarized as follows; 1. The rate of landslide appeared 75% in A forest road, 50% in B forest road, and then the average 67% in A and B forest road. But the value of landslide showed considerably low. 2. Because of landslide chiefly occuring on banking slope of $36^{\circ}{\sim}38^{\circ}$ and on cutting slope of $42^{\circ}{\sim}43^{\circ}$, it is suitable to decide the banking slope and cutting slope below each $36^{\circ}$ and $40^{\circ}$. 3. Landslide was the same on banking slopes through the length of slope. The best suitable length of slope is below 4m in cutting slope.

• Korean Journal of Environment and Ecology
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• v.13 no.3
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• pp.234-243
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• 1999

이 연구는 장태산 휴양림에서 탐방로의 분석을 통해 추후 휴양림의 탐방로 조성에 필요한 기초자료를 제공하기 위하여 수행되었다. 장태산 휴양림의 기존 탐방로 A와 B의 거리는 1,273m와 965m이었으며 평균물매는 각각 9%와 14%로 조사되었다. 평균 칼로리 소비량은 탐방로 A를 올라갈 때와 내려갈때가 각각 140kcal와 104kcal이었으며 탐방로 B의 경우는 올라갈 때와 내려갈때가 각각 132kcal 와 89kcal로 조사되었다. 평균보행시간은 각각 약 18분과 15분으로 조사되었다. 신규 탐방로 노선 선정의 기초자료를 제공하기 위하여 GIS프로그램인 IDRISI를 이용하여 장태산휴양림의 DEM을 구축한후 탐방로의 노선을 선정하였다.

• Proceedings of the Korean Society of Environment and Ecology Conference
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• 2005.04a
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• pp.41-47
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• 2005

본 연구는 속리산국립?공원에 위치하고 있는 낙영산탐방로에 대하여 탐방로 관리와 공원관리에의 기초적인 자료제시를 목적으로 낙영산 탐방로 3곳에 대한 통행량 조사와 탐방로에 대한 훼손존사를 실시하였으며 이에 대한 결과로서 낙영산을 찾는 등산객은 대부분 공림사를 통해서 낙영산정상을 경유 매표소로 내려오는 비정규 탐방로를 이용하여 있었으며, 이를 분석해본 결과 주차장문제와 탐방객극 인식과 홍보 부족인 것으로 나타났다. 공림사$\~$낙영산구간에 대한 훼손이 대단히 심각한 상태이며 뿌리노출이 가장 흔한 훼손의 유형으로 나타났다. 낙영산탐방로의 평균 나지폭은 2.6m이며, 평균최대침식깊이는 1.25m이며 종속변수인 침식에 대한 각 요인별 회귀분석결과 경도에 대해서는 음의 상관관계를 입장객과 물매와는 양의 상관관계나 나타났다. 이는 탐방객의 홍보를 통한 인식의 변화와 탐방객의 입장에서의 적절한 탐방로의 지정과 출입통제와 현재 훼손된 지역에 대한 노면정비와 훼손지복구를 실시해야 한다는 것을 의미한다.